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{{Use dmy dates|date=April 2012}}File:Global Gas trade both LNG and Pipeline.png|thumb|upright=1.95|The global natural gas trade in 2013. Numbers are in billion cubic meters per year.ENCYCLOPEDIA, Natural Gas – Exports,weblink The World Factbook, Central Intelligence Agency, 11 June 2015, ]]File:World - Natural Gas Production of Countries.png|thumb|upright=1.75|Natural gas extraction by countries in cubic meters per year around 2013]]Natural gas (also called fossil gas) is a naturally occurring hydrocarbon gas mixture consisting primarily of methane, but commonly including varying amounts of other higher alkanes, and sometimes a small percentage of carbon dioxide, nitrogen, hydrogen sulfide, or helium.WEB,weblink Background, Naturalgas.org, 2012-07-14,weblink" title="web.archive.org/web/20140709040340weblink">weblink 2014-07-09, dmy-all, It is formed when layers of decomposing plant and animal matter are exposed to intense heat and pressure under the surface of the Earth over millions of years. The energy that the plants originally obtained from the sun is stored in the form of chemical bonds in the gas.WEB,weblink Electricity from Natural Gas, 2013-11-10,weblink" title="web.archive.org/web/20140606215324weblink">weblink 2014-06-06, dmy-all, Natural gas is a non-renewable hydrocarbon used as a source of energy for heating, cooking, and electricity generation. It is also used as a fuel for vehicles and as a chemical feedstock in the manufacture of plastics and other commercially important organic chemicals.Natural gas has a complicated effect on climate change, it itself is a greenhouse gasWEB, Methane Emissions in the Oil and Gas Industry,weblink American Geosciences Institute, 1 May 2019, 16 May 2018, and it releases carbon dioxide when burned. However natural gas use often supplants coal usage which is far more environmentally damaging, leading to lower net carbon dioxide emissions in countries such as the US.JOURNAL, JACOBY, Henry D., Technology and technical change in the MIT EPPA model, Energy Economics, 2006, 26, 5-6, 610–631,weblink 29 September 2019, JOURNAL, Moniz, E.J., The Future of Natural Gas: An Interdisciplinary MIT Study, MIT Press, 2011,weblink 29 September 2019, Natural gas is found in deep underground rock formations or associated with other hydrocarbon reservoirs in coal beds and as methane clathrates. Petroleum is another resource and fossil fuel found close to and with natural gas. Most natural gas was created over time by two mechanisms: biogenic and thermogenic. Biogenic gas is created by methanogenic organisms in marshes, bogs, landfills, and shallow sediments. Deeper in the earth, at greater temperature and pressure, thermogenic gas is created from buried organic material.WEB, US Geological Survey,weblink Organic Origins of Petroleum,weblink" title="web.archive.org/web/20100527093933weblink">weblink 27 May 2010, WEB,weblink Natural Gas Explained, U.S. Energy Information Administration (eia), In petroleum production gas is sometimes burned as flare gas. Before natural gas can be used as a fuel, most, but not all, must be processed to remove impurities, including water, to meet the specifications of marketable natural gas. The by-products of this processing include: ethane, propane, butanes, pentanes, and higher molecular weight hydrocarbons, hydrogen sulfide (which may be converted into pure sulfur), carbon dioxide, water vapor, and sometimes helium and nitrogen.Natural gas is sometimes informally referred to simply as "gas", especially when compared to other energy sources such as oil or coal. However, it is not to be confused with gasoline, especially in North America, where the term gasoline is often shortened in colloquial usage to gas.

History

File:Chuhuo.jpg|thumb|Burning of natural gas coming out of the ground in TaiwanTaiwanNatural gas was discovered accidentally in ancient China, as it resulted from the drilling for brines. Natural gas was first used by the Chinese in about 500 BCE (possibly even 1000 BCEWEB, Eric & Chun-Chih Hadley-Ives,weblink First Oil Wells, www.historylines.net, ). They discovered a way to transport gas seeping from the ground in crude pipelines of bamboo to where it was used to boil salt water to extract the salt,WEB,weblink History, NaturalGas.org, 1 December 2016, dmy-all, BOOK, The Economics of the Gas Supply Industry, Abbott, Malcolm, Routledge, 978-1-138-99879-7, 2016, 185, in the Ziliujing District of Sichuan.BOOK, The Economics of the Gas Supply Industry, Abbott, Malcolm, Routledge, 2016, 185, The discovery and identification of natural gas in the Americas happened in 1626. In 1821, William Hart successfully dug the first natural gas well at Fredonia, New York, United States, which led to the formation of the Fredonia Gas Light Company. The city of Philadelphia created the first municipally owned natural gas distribution venture in 1836.WEB,weblink A Brief History of Natural Gas - APGA, www.apga.org, 2019-02-18, By 2009, 66 000 km³ (or 8%) had been used out of the total 850 000 km³ of estimated remaining recoverable reserves of natural gas.WEB,weblink World Energy Outlook 2009, 2009, International Energy Agency, Based on an estimated 2015 world consumption rate of about 3400 km³ of gas per year, the total estimated remaining economically recoverable reserves of natural gas would last 250 years at current consumption rates. An annual increase in usage of 2–3% could result in currently recoverable reserves lasting significantly less, perhaps as few as 80 to 100 years.

Sources

{{See also|List of natural gas fields|List of countries by natural gas proven reserves|List of countries by natural gas production}}

Natural gas

File:BarnettShaleDrilling-9323.jpg|thumb|upright|Natural gas drilling rigdrilling rigIn the 19th century, natural gas was usually obtained as a by-product of producing oil, since the small, light gas carbon chains came out of solution as the extracted fluids underwent pressure reduction from the reservoir to the surface, similar to uncapping a soft drink bottle where the carbon dioxide effervesces. Unwanted natural gas was a disposal problem in the active oil fields. If there was not a market for natural gas near the wellhead it was prohibitively expensive to pipe to the end user.In the 19th century and early 20th century, unwanted gas was usually burned off at oil fields. Today, unwanted gas (or stranded gas without a market) associated with oil extraction often is returned to the reservoir with 'injection' wells while awaiting a possible future market or to repressurize the formation, which can enhance extraction rates from other wells. In regions with a high natural gas demand (such as the US), pipelines are constructed when it is economically feasible to transport gas from a wellsite to an end consumer.In addition to transporting gas via pipelines for use in power generation, other end uses for natural gas include export as liquefied natural gas (LNG) or conversion of natural gas into other liquid products via gas to liquids (GTL) technologies. GTL technologies can convert natural gas into liquids products such as gasoline, diesel or jet fuel. A variety of GTL technologies have been developed, including Fischer–Tropsch (F–T), methanol to gasoline (MTG) and syngas to gasoline plus (STG+). F–T produces a synthetic crude that can be further refined into finished products, while MTG can produce synthetic gasoline from natural gas. STG+ can produce drop-in gasoline, diesel, jet fuel and aromatic chemicals directly from natural gas via a single-loop process.WEB,weblink Introduction to STG+ Technology, Primus Green Energy, February 2013, 5 March 2013, In 2011, Royal Dutch Shell's {{convert|140,000|oilbbl|m3|sp=us}} per day F–T plant went into operation in Qatar.WEB,weblink First cargo of Pearl GTL products ship from Qatar, Shell Global, 13 June 2011, 19 November 2017, dmy-all, Natural gas can be "associated" (found in oil fields), or "non-associated" (isolated in natural gas fields), and is also found in coal beds (as coalbed methane).WEB, Extraction,weblink NaturalGas.org,weblink" title="web.archive.org/web/20130708145258weblink">weblink 8 July 2013, It sometimes contains a significant amount of ethane, propane, butane, and pentane—heavier hydrocarbons removed for commercial use prior to the methane being sold as a consumer fuel or chemical plant feedstock. Non-hydrocarbons such as carbon dioxide, nitrogen, helium (rarely), and hydrogen sulfide must also be removed before the natural gas can be transported.WEB,weblink Natural gas overview, Naturalgas.org, 6 February 2011, dead,weblink" title="web.archive.org/web/20110101063224weblink">weblink 1 January 2011, dmy-all, Natural gas extracted from oil wells is called casinghead gas (whether or not truly produced up the annulus and through a casinghead outlet) or associated gas. The natural gas industry is extracting an increasing quantity of gas from challenging resource types: sour gas, tight gas, shale gas, and coalbed methane.There is some disagreement on which country has the largest proven gas reserves. Sources that consider that Russia has by far the largest proven reserves include the US CIA (47 600 km³),ENCYCLOPEDIA,weblink Natural Gas – Proved Reserves, The World Factbook, Central Intelligence Agency, 1 December 2013, the US Energy Information Administration (47 800 km³),US Energy Information Administration, International statistics, accessed 1 Dec. 2013.WEB,weblink U.S. Crude Oil, Natural Gas, and Natural Gas Proved Reserves, Year-end 2017, www.eia.gov, 2019-08-26, and OPEC (48 700 km³).WEB, OPEC,weblink Table 3.2 — World Proven Natural Gas Reserves by Country, 1 Dec 2013, However, BP credits Russia with only 32 900 km³,WEB, BP,weblink BP Statistical Review of World Energy June 2013,weblink" title="web.archive.org/web/20131204120328weblink">weblink 4 December 2013, which would place it in second place, slightly behind Iran (33 100 to 33 800 km³, depending on the source). With Gazprom, Russia is frequently the world's largest natural gas extractor. Major proven resources (in cubic kilometers) are world 187 300 (2013), Iran 33 600 (2013), Russia 32 900 (2013), Qatar 25 100 (2013), Turkmenistan 17 500 (2013) and the United States 8500 (2013).File:Countries by Natural Gas Proven Reserves (2014).svg|thumb|upright=2|Countries by natural gas proven reserves (2014), based on data from The World Factbook]]It is estimated that there are about 900 000 km³ of "unconventional" gas such as shale gas, of which 180 000 km³ may be recoverable.WEB,weblink Wonderfuel: Welcome to the age of unconventional gas, Helen Knight, New Scientist, 12 June 2010, 44–47, subscription, In turn, many studies from MIT, Black & Veatch and the DOE predict that natural gas will account for a larger portion of electricity generation and heat in the future.WEB, Michael Kanellos, Greentech Media,weblink In Natural Gas, U.S. Will Move From Abundance to Imports, 9 June 2011, The world's largest gas field is the offshore South Pars / North Dome Gas-Condensate field, shared between Iran and Qatar. It is estimated to have {{convert|51000|km3|mi3|sp=us}} of natural gas and {{convert|50|e9oilbbl|e9m3|abbr=off|sp=us}} of natural gas condensates.Because natural gas is not a pure product, as the reservoir pressure drops when non-associated gas is extracted from a field under supercritical (pressure/temperature) conditions, the higher molecular weight components may partially condense upon isothermic depressurizing—an effect called retrograde condensation. The liquid thus formed may get trapped as the pores of the gas reservoir get depleted. One method to deal with this problem is to re-inject dried gas free of condensate to maintain the underground pressure and to allow re-evaporation and extraction of condensates. More frequently, the liquid condenses at the surface, and one of the tasks of the gas plant is to collect this condensate. The resulting liquid is called natural gas liquid (NGL) and has commercial value.

Shale gas

{{Globalize|article|USA|2name=the United States|date=September 2013}}File:GasDepositDiagram.jpg|thumb|upright=2.0|The location of shale gasshale gasShale gas is natural gas produced from shale. Because shale has matrix permeability too low to allow gas to flow in economical quantities, shale gas wells depend on fractures to allow the gas to flow. Early shale gas wells depended on natural fractures through which gas flowed; almost all shale gas wells today require fractures artificially created by hydraulic fracturing. Since 2000, shale gas has become a major source of natural gas in the United States and Canada.WEB, Jad, Mouawad,weblink Estimate places natural gas reserves 35% higher, New York Times, 17 June 2009, 25 October 2009, Because of increased shale gas production, the United States is now the number one natural gas producer in the world.WEB, U.S. Now World's Leading Natural Gas Producer, Desert Sun,weblink Morris Beschloss, 2 September 2014, 4 November 2014, Following the success in the United States, shale gas exploration is beginning in countries such as Poland, China, and South Africa.WEB, Financial Times, Poland Seeks to Boost Shale Gas Industry, 2012,weblink 2012-10-18, subscription, WEB, Catherine T. Yang, National Geographic, China Drills Into Shale Gas, Targeting Huge Reserves Amid Challenges, 9 August 2012,weblink 2012-10-18, WEB, Bloomberg, Franz Wild, Andres R. Martinez, South Africa Allows Exploration of Shale Gas Resources, 7 September 2012,weblink 2012-10-18, subscription,

Town gas

Town gas is a flammable gaseous fuel made by the destructive distillation of coal. It contains a variety of calorific gases including hydrogen, carbon monoxide, methane, and other volatile hydrocarbons, together with small quantities of non-calorific gases such as carbon dioxide and nitrogen, and is used in a similar way to natural gas. This is a historical technology and is not usually economically competitive with other sources of fuel gas today.Most town "gashouses" located in the eastern US in the late 19th and early 20th centuries were simple by-product coke ovens that heated bituminous coal in air-tight chambers. The gas driven off from the coal was collected and distributed through networks of pipes to residences and other buildings where it was used for cooking and lighting. (Gas heating did not come into widespread use until the last half of the 20th century.) The coal tar (or asphalt) that collected in the bottoms of the gashouse ovens was often used for roofing and other waterproofing purposes, and when mixed with sand and gravel was used for paving streets.

Biogas

Methanogenic Archaea are responsible for almost all biological sources of methane, though methylphosphonate-degrading Bacteria produce an as-yet not fully quantified fraction of biogenic methane, particularly in the oceans.JOURNAL, DM Karl, L Beversdorf, KM Björkman, MJ Church, A Martinez, EF DeLong, 2008, Nature Geoscience, 1, 7, 473–478, Aerobic production of methane in the sea, 10.1038/ngeo234, 2008NatGe...1..473K, Some live in symbiotic relationships with other life forms, including termites, ruminants, and cultivated crops. Other sources of methane, the principal component of natural gas, include landfill gas, biogas, and methane hydrate. When methane-rich gases are produced by the anaerobic decay of organic matter (biomass), these are referred to as biogas (or natural biogas). Sources of biogas include swamps, marshes, and landfills, as well as agricultural waste materials such as sewage sludge and manure by way of anaerobic digesters,WEB,weblink David Schmidt, Anaerobic Digestion Overview, University of Minnesota, 2017-11-19, in addition to enteric fermentation, particularly in cattle. Landfill gas is created by decomposition of waste in landfill sites. Excluding water vapor, about half of landfill gas is methane and most of the rest is carbon dioxide, with small amounts of nitrogen, oxygen, and hydrogen, and variable trace amounts of hydrogen sulfide and siloxanes. If the gas is not removed, the pressure may get so high that it works its way to the surface, causing damage to the landfill structure, unpleasant odor, vegetation die-off, and an explosion hazard. The gas can be vented to the atmosphere, flared or burned to produce electricity or heat. Biogas can also be produced by separating organic materials from waste that otherwise goes to landfills. This method is more efficient than just capturing the landfill gas it produces. Anaerobic lagoons produce biogas from manure, while biogas reactors can be used for manure or plant parts. Like landfill gas, biogas is mostly methane and carbon dioxide, with small amounts of nitrogen, oxygen and hydrogen. However, with the exception of pesticides, there are usually lower levels of contaminants.Landfill gas cannot be distributed through utility natural gas pipelines unless it is cleaned up to less than 3% {{chem|C|O|2}}, and a few parts per million {{chem|H|2|S}}, because {{chem|C|O|2}} and {{chem|H|2|S}} corrode the pipelines.WEB,weblink Interstate Natural Gas—Quality Specifications & Interchangeability, 6 February 2011, dead,weblink" title="web.archive.org/web/20110812145240weblink">weblink 12 August 2011, dmy-all, The presence of {{chem|C|O|2}} will lower the energy level of the gas below requirements for the pipeline.WEB,weblink Reading: Natural Gas {{!, Geology|website=courses.lumenlearning.com|access-date=2019-08-26}}BOOK,weblink Handbook of Natural Gas Analysis, Speight, James G., 2018-08-14, John Wiley & Sons, 9781119240280, en, Siloxanes in the gas will form deposits in gas burners and need to be removed prior to entry into any gas distribution or transmission system. Consequently, it may be more economical to burn the gas on site or within a short distance of the landfill using a dedicated pipeline. Water vapor is often removed, even if the gas is burned on site. If low temperatures condense water out of the gas, siloxanes can be lowered as well because they tend to condense out with the water vapor. Other non-methane components may also be removed to meet emission standards, to prevent fouling of the equipment or for environmental considerations. Co-firing landfill gas with natural gas improves combustion, which lowers emissions.Biogas, and especially landfill gas, are already used in some areas, but their use could be greatly expanded. Experimental systems were being proposed{{when|date=June 2013}} for use in parts of Hertfordshire, UK, and Lyon in France.{{citation needed|date=June 2013}} Using materials that would otherwise generate no income, or even cost money to get rid of, improves the profitability and energy balance of biogas production. Gas generated in sewage treatment plants is commonly used to generate electricity. For example, the Hyperion sewage plant in Los Angeles burns {{convert|8|e6cuft|m3|abbr=off|sp=us}} of gas per day to generate powerWEB, LA Sewers,weblink 2011-02-06,weblink" title="web.archive.org/web/20111012162905weblink">weblink 2011-10-12, Hyperion Treatment Plant, New York City utilizes gas to run equipment in the sewage plants, to generate electricity, and in boilers.WEB, New York City's Wastewater Treatment System,weblink New York City Department of Environmental Protection, 2011-02-06, Using sewage gas to make electricity is not limited to large cities. The city of Bakersfield, California, uses cogeneration at its sewer plants.WEB,weblink Bakersfield Wastewater Treatment Plant 3, Parsons, 2009-12-05, 2011-02-06,weblink 2011-01-21, California has 242 sewage wastewater treatment plants, 74 of which have installed anaerobic digesters. The total biopower generation from the 74 plants is about 66 MW.WEB, Orta, Jason, Zhiqin Zhang, etal,weblink 2010, 2009 Progress to Plan – Bioenergy Action Plan for California, California Energy Commission , CEC‐500‐2010‐007,

Crystallized natural gas — hydratesJOURNAL, lastErfani, firstAmir, last2Fallah-Jokandan, first2Elham, last3Varaminian, first3Farshad, dateJanuary 2017, titleEffects of non-ionic surfactants on formation kinetics of structure H hydrate regarding transportation and storage of natural gas, journalJournal of Natural Gas Science and Engineering, volume37, pages397–408, doi10.1016/j.jngse.2016.11.058, issn1875-5100,

Huge quantities of natural gas (primarily methane) exist in the form of hydrates under sediment on offshore continental shelves and on land in arctic regions that experience permafrost, such as those in Siberia. Hydrates require a combination of high pressure and low temperature to form.In 2010, the cost of extracting natural gas from crystallized natural gas was estimated to be as much as twice the cost of extracting natural gas from conventional sources, and even higher from offshore deposits.WEB, CNN Money, Steve Hargreaves,weblink Natural gas crystals: Energy under the sea, 2010-03-09, 2011-02-06, dmy-all, In 2013, Japan Oil, Gas and Metals National Corporation (JOGMEC) announced that they had recovered commercially relevant quantities of natural gas from methane hydrate.WEB, The New York Times,weblink An Energy Coup for Japan: 'Flammable Ice', Hiroko, Tabuchi, 12 March 2013, File:NaturalGasProcessingPlant.jpg|thumb|The McMahon natural gas processing plant in Taylor, British ColumbiaTaylor, British Columbia

Processing

The image below is a schematic block flow diagram of a typical natural gas processing plant. It shows the various unit processes used to convert raw natural gas into sales gas pipelined to the end user markets.The block flow diagram also shows how processing of the raw natural gas yields byproduct sulfur, byproduct ethane, and natural gas liquids (NGL) propane, butanes and natural gasoline (denoted as pentanes +).WEB, The Louisiana Department of Natural Resources,weblink Natural Gas Processing: The Crucial Link Between Natural Gas Production and Its Transportation to Market, January 2006, Energy Information Administration, Office of Oil and Gas, 24 November 2017, dmy-all, WEB,weblink Natural Gas Processing, Axens, 24 November 2017, BOOK, 1 January 2012,weblink Reliable & Efficient Feed Gas Preparation – A Key Enabler to Pearl GTL, OnePetro, Arg, S.R., Engel, D.C., Society of Petroleum Engineers, 10.2118/157375-MS, 11 June 2015, dmy-all, Reliable & Efficient Feed Gas Preparation - A Key Enabler to Pearl GTL, CONFERENCE, Doug, Elliot, etal, Prepared for Presentation at AIChE 2005 Spring National Meeting 5th Topical Conference on Natural Gas Utilization (TI) Session 16c – Gas,weblink 2005, Benefits of Integrating NGL Extraction and LNG Liquefaction,weblink" title="web.archive.org/web/20130626080757weblink">weblink 26 June 2013, (File:NatGasProcessing.svg|frame|center|Schematic flow diagram of a typical natural gas processing plant)

Depletion

As of 2018, natural gas production in the US has peaked twice, with current levels exceeding both previous peaks.WEB,weblink Oil and natural gas depletion and our future, Seppo Korpela, 21 July 2007, Resilience, It reached 24.1 million cubic feet in 1973, followed by a decline, and reached 24.5 million cubic feet in 2001. After a brief drop, withdrawals have been increasing nearly every year since 2006, with 2017 production at 33.4 million cubic feet.WEB,weblink U.S. Natural Gas Gross Withdrawals, U.S. Energy Information Administration (eia),

Storage and transport

File:Polyethylene gas main.jpg|thumb|upright|Polyethylene plastic main being placed in a trenchtrenchBecause of its low density, it is not easy to store natural gas or to transport it by vehicle. Natural gas pipelines are impractical across oceans, since the gas needs to be cooled down and compressed, as the friction in the pipeline causes the gas to heat up. Many existing pipelines in America are close to reaching their capacity, prompting some politicians representing northern states to speak of potential shortages. The large trade cost implies that natural gas markets are globally much less integrated, causing significant price differences across countries. In Western Europe, the gas pipeline network is already dense.WEB, Energia Mexicana, Spanish,weblink Gas Infrastructure Europe, 18 June 2009, {{better source|date=November 2017}}{{full citation needed|date=November 2017}} New pipelines are planned or under construction in Eastern Europe and between gas fields in Russia, Near East and Northern Africa and Western Europe. See also List of natural gas pipelines.Whenever gas is bought or sold at custody transfer points, rules and agreements are made regarding the gas quality. These may include the maximum allowable concentration of {{chem|C|O|2}}, {{chem|H|2|S}} and {{chem|H|2|O}}. Usually sales quality gas that has been treated to remove contamination is traded on a "dry gas" basis and is required to be commercially free from objectionable odours, materials, and dust or other solid or liquid matter, waxes, gums and gum forming constituents, which might damage or adversely affect operation of equipment downstream of the custody transfer point.LNG carriers transport liquefied natural gas (LNG) across oceans, while tank trucks can carry liquefied or compressed natural gas (CNG) over shorter distances.JOURNAL, Ulvestad, Marte, Overland, Indra, 2012, Natural gas and CO2 price variation: Impact on the relative cost-efficiency of LNG and pipelines,weblink International Journal of Environmental Studies, 69, 3, 407–426, 10.1080/00207233.2012.677581, 24683269, 3962073, Sea transport using CNG carrier ships that are now under development may be competitive with LNG transport in specific conditions.Gas is turned into liquid at a liquefaction plant, and is returned to gas form at regasification plant at the terminal. Shipborne regasification equipment is also used. LNG is the preferred form for long distance, high volume transportation of natural gas, whereas pipeline is preferred for transport for distances up to {{convert|4000|km|abbr=on}} over land and approximately half that distance offshore.CNG is transported at high pressure, typically above {{convert|200|bar|kPa psi|lk=in}}. Compressors and decompression equipment are less capital intensive and may be economical in smaller unit sizes than liquefaction/regasification plants. Natural gas trucks and carriers may transport natural gas directly to end-users, or to distribution points such as pipelines.File:Manlove gas storage facility crop.jpg|thumb|Peoples Gas Manlove Field natural gas storage area in Newcomb Township, Champaign County, IllinoisNewcomb Township, Champaign County, IllinoisIn the past, the natural gas which was recovered in the course of recovering petroleum could not be profitably sold, and was simply burned at the oil field in a process known as flaring. Flaring is now illegal in many countries.BOOK, Hyne, Norman J.,weblink Dictionary of Petroleum Exploration, Drilling & Production, PennWell Books, 1991, 190, 978-0-87814-352-8, Additionally, higher demand in the last 20–30 years has made production of gas associated with oil economically viable. As a further option, the gas is now sometimes re-(wikt:inject|injected) into the formation for enhanced oil recovery by pressure maintenance as well as miscible or immiscible flooding. Conservation, re-injection, or flaring of natural gas associated with oil is primarily dependent on proximity to markets (pipelines), and regulatory restrictions.Natural gas can be indirectly exported through the absorption in other physical output. A recent study suggests that the expansion of shale gas production in the US has caused prices to drop relative to other countries. This has caused a boom in energy intensive manufacturing sector exports, whereby the average dollar unit of US manufacturing exports has almost tripled its energy content between 1996 and 2012.JOURNAL, On the Comparative Advantage of U.S. Manufacturing: Evidence from the Shale Gas Revolution, Journal of International Economics,weblink Rabah, Arezki, Thiemo, Fetzer, January 2016,weblink" title="web.archive.org/web/20160701075547weblink">weblink 2016-07-01, Centre for Economic Performance, 2042-2695, A "master gas system" was invented in Saudi Arabia in the late 1970s, ending any necessity for flaring. Satellite observation, however, shows that flaringWEB, Bank-Led Satellite Imagery Sheds More Light on Gas Flaring Pollution,weblink 29 August 2007, The World Bank — News & Broadcast, 24 November 2017, WEB, Will eyes in the sky end natural gas flaring?,weblink Ethan, 9 November 2007, Ethan Zuckerman’s online home, 24 November 2017, WEB,weblink Composite image of gas flares in 1992, 2000 and 2006 by NGDC, Ethan Zuckerman’s online home, 9 November 2007, 2011-02-06, National Geophysical Data Center (NGDC)WEB, Composite image of the earth at night,weblink Ethan Zuckerman’s online home, 24 November 2017, and venting{{citation needed|date=November 2017}} are still practiced in some gas-extracting countries.Natural gas is used to generate electricity and heat for desalination. Similarly, some landfills that also discharge methane gases have been set up to capture the methane and generate electricity.Natural gas is often stored underground inside depleted gas reservoirs from previous gas wells, salt domes, or in tanks as liquefied natural gas. The gas is injected in a time of low demand and extracted when demand picks up. Storage nearby end users helps to meet volatile demands, but such storage may not always be practicable.With 15 countries accounting for 84% of the worldwide extraction, access to natural gas has become an important issue in international politics, and countries vie for control of pipelines.WEB,weblink The Contours of the New Cold War, IMI, Jürgen Wagner, 19 June 2007, 2011-02-06, dmy-all, In the first decade of the 21st century, Gazprom, the state-owned energy company in Russia, engaged in disputes with Ukraine and Belarus over the price of natural gas, which have created concerns that gas deliveries to parts of Europe could be cut off for political reasons.WEB,weblink Gazprom and Russian Foreign Policy, NPR, 24 November 2017, The United States is preparing to export natural gas.WEB, Seeking Alpha, Sumit Roy,weblink U.S. Natural Gas Export Era Begins In 2015, Fueling Upside In Prices, 23 June 2014, 11 June 2015,

Floating liquefied natural gas

Floating liquefied natural gas (FLNG) is an innovative technology designed to enable the development of offshore gas resources that would otherwise remain untapped due to environmental or economic factors which currently make them impractical to develop via a land-based LNG operation. FLNG technology also provides a number of environmental and economic advantages:
  • Environmental â€“ Because all processing is done at the gas field, there is no requirement for long pipelines to shore, compression units to pump the gas to shore, dredging and jetty construction, and onshore construction of an LNG processing plant, which significantly reduces the environmental footprint.WEB,weblink SEAAOC – NT Resources Week – Informa – NT Government, NTRW, 11 June 2015, dead,weblink" title="web.archive.org/web/20120325160619weblink">weblink 25 March 2012, dmy-all, Avoiding construction also helps preserve marine and coastal environments. In addition, environmental disturbance will be minimised during decommissioning because the facility can easily be disconnected and removed before being refurbished and re-deployed elsewhere.
  • Economic â€“ Where pumping gas to shore can be prohibitively expensive, FLNG makes development economically viable. As a result, it will open up new business opportunities for countries to develop offshore gas fields that would otherwise remain stranded, such as those offshore East Africa.WEB,weblink The Floating Liquefied Natural Gas (FLNG) Market 2011-2021, visiongain, subscription, ENE8974, 28 January 2011, 11 June 2015,
Many gas and oil companies are considering the economic and environmental benefits of floating liquefied natural gas (FLNG). There are currently projects underway to construct five FLNG facilities. Petronas is close to completion on their FLNG-1WEB,weblink Petronas' FLNG Facility to Deliver First Cargo in Q1 2016, World Maritime News Staff, 22 April 2015, 23 November 2017, at Daewoo Shipbuilding and Marine Engineering and are underway on their FLNG-2 projectWEB, Asian Oil & Gas, 16 June 2015,weblink Steel cut for PETRONAS FLNG 2, Audrey, Raj, 23 November 2017, at Samsung Heavy Industries. Shell Prelude is due to start production 2017.WEB,weblink prelude starts production, The Browse LNG project will commence FEED in 2019.WEB,weblink Browse Development — We remain committed to the earliest commercial development of the world-class Browse resources, Woodside continues to target the selection of a Browse development concept in H2 2017 and commencement of front-end engineering and design (FEED) in 2019., www.woodside.com.au,

Uses

Natural gas is primarily used in the northern hemisphere. North America and Europe are major consumers.

Mid-stream natural gas

Often well head gases require removal of various hydrocarbon molecules contained within the gas. Some of these gases include heptane, pentane, propane and other hydrocarbons with molecular weights above methane ({{chem|C|H|4}}). The natural gas transmission lines extend to the natural gas processing plant or unit which removes the higher molecular weighted hydrocarbons to produce natural gas with energy content between {{convert|950|-|1050|BTU/cuft|MJ/m3}}. The processed natural gas may then be used for residential, commercial and industrial uses.Natural gas flowing in the distribution lines is called mid-stream natural gas and is often used to power engines which rotate compressors. These compressors are required in the transmission line to pressurize and repressurize the mid-stream natural gas as the gas travels. Typically, natural gas powered engines require {{convert|950|-|1050|BTU/cuft|MJ/m3|abbr=on}} natural gas to operate at the rotational name plate specifications.WEB, Natural Gas Fuel Conditioning System – BTU Reduction,weblink American Environmental Fabrication & Supply, LLC, 23 November 2017, Several methods are used to remove these higher molecular weighted gases for use by the natural gas engine. A few technologies are as follows:

Power generation

Natural gas is a major source of electricity generation through the use of cogeneration, gas turbines and steam turbines. Natural gas is also well suited for a combined use in association with renewable energy sources such as wind or solarWEB,weblink New Solar Process Gets More Out of Natural Gas, 10 April 2013, Matthew L. Wald, New York Times, and for alimenting peak-load power stations functioning in tandem with hydroelectric plants. Most grid peaking power plants and some off-grid engine-generators use natural gas. Particularly high efficiencies can be achieved through combining gas turbines with a steam turbine in combined cycle mode. Natural gas burns more cleanly than other fuels, such as oil and coal. Because burning natural gas produces both water and carbon dioxide, it produces less carbon dioxide per unit of energy released than coal, which produces mostly carbon dioxide. Burning natural gas produces only about half the carbon dioxide per kilowatt-hour (kWh) that coal does. For transportation, burning natural gas produces about 30% less carbon dioxide than burning petroleum. The US Energy Information Administration reports the following emissions in million metric tons of carbon dioxide in the world for 2012:WEB,weblink World Carbon Dioxide Emissions from the Use of Fossil Fuels, U.S. Energy Information Administration (eia), 2016-02-05, dead,weblink" title="web.archive.org/web/20110523215823weblink">weblink 23 May 2011, dmy-all, {{clarify|date=November 2017|reason=date in article:2012, archive date:2011, report for year 2006}}
  • Natural gas: 6,799
  • Petroleum: 11,695
  • Coal: 13,787
Coal-fired electric power generation emits around {{convert|2000|lb|kg|sigfig=1}} of carbon dioxide for every megawatt-hour (MWh) generated, which is almost double the carbon dioxide released by natural gas-fired generation.WEB,weblink How much carbon dioxide is produced when different fuels are burned?, U.S. Energy Information Administration (eia), Because of this higher carbon efficiency of natural gas generation, as the fuel mix in the United States has changed to reduce coal and increase natural gas generation, carbon dioxide emissions have unexpectedly fallen. Those measured in the first quarter of 2012 were the lowest of any recorded for the first quarter of any year since 1992.WEB, Rachel, Nuwer, A 20–Year Low in U.S. Carbon Emissions,weblink New York Times, 17 August 2012, Combined cycle power generation using natural gas is currently the cleanest available source of power using hydrocarbon fuels, and this technology is widely and increasingly used as natural gas can be obtained at increasingly reasonable costs. Fuel cell technology may eventually provide cleaner options for converting natural gas into electricity, but as yet it is not price-competitive. Locally produced electricity and heat using natural gas powered Combined Heat and Power plant (CHP or Cogeneration plant) is considered energy efficient and a rapid way to cut carbon emissions.WEB,weblink Biomass drying from CHP heat recovery, Alfagy Limited, 2012-11-02, Natural gas generated power has increased from 740 TWh in 1973 to 5140 TWh in 2014, generating 22% of the worlds total electricity. Approximately half as much as generated with coal.WEB, International Energy Agency,weblink 2014 data?, 24, dead,weblink" title="web.archive.org/web/20150405035039weblink">weblink 5 April 2015, dmy-all, {{verify source|date=November 2017}}{{full citation needed|date=November 2017}} Efforts around the world to reduce the use of coal has led some regions to switch to natural gas.

Domestic use

Natural gas dispensed in a residential setting can generate temperatures in excess of {{convert|1100|°C|°F|-2}} making it a powerful domestic cooking and heating fuel.BOOK, Nature's Curiosity Shop, Zimmerman, Barry E., Zimmerman, David J., 1995, 28, Contemporary books, Lincolnwood (Chicago), IL, 978-0-8092-3656-5, registration,weblink In much of the developed world it is supplied through pipes to homes, where it is used for many purposes including ranges and ovens, gas-heated clothes dryers, heating/cooling, and central heating.BOOK, Mulvaney, Dustin, Green Energy: An A-to-Z Guide, 2011, SAGE, 978-1-4129-9677-8,weblink 301, Heaters in homes and other buildings may include boilers, furnaces, and water heaters. Both North America and Europe are major consumers of natural gas.Domestic appliances, furnaces, and boilers use low pressure, usually 6 to 7 inches of water (6" to 7" WC), which is about 0.25 psig. The pressures in the supply lines vary, either utilization pressure (UP, the aforementioned 6" to 7" WC) or elevated pressure (EP), which may be anywhere from 1 psig to 120 psig. Systems using EP have a regulator at the service entrance to step down the pressure to UP.{{citation needed|date=November 2017}}In the US compressed natural gas (CNG) is available in some rural areas as an alternative to less expensive and more abundant LPG (liquefied petroleum gas), the dominant source of rural gas. It is used in homes lacking direct connections to public utility provided gas, or to fuel portable grills. Natural gas is also supplied by independent natural gas suppliers through Natural Gas Choice programs{{clarify|date=May 2019}} throughout the United States.File:WMATA 3006.jpg|thumb|A Washington, D.C. Metrobus, which runs on natural gas]]

Transportation

CNG is a cleaner and also cheaper alternative to other automobile fuels such as gasoline (petrol).WEB,weblink Alternative Fuels Data Center: Natural Gas Vehicle Emissions, afdc.energy.gov, 2019-09-01, By the end of 2014 there were over 20 million natural gas vehicles worldwide, led by Iran (3.5 million), China (3.3 million), Pakistan (2.8 million), Argentina (2.5 million), India (1.8 million), and Brazil (1.8 million).WEB,weblink Worldwide NGV statistics,weblink" title="web.archive.org/web/20150206153839weblink">weblink 2015-02-06, NGV journal, 2017-11-19, The energy efficiency is generally equal to that of gasoline engines, but lower compared with modern diesel engines. Gasoline/petrol vehicles converted to run on natural gas suffer because of the low compression ratio of their engines, resulting in a cropping of delivered power while running on natural gas (10–15%). CNG-specific engines, however, use a higher compression ratio due to this fuel's higher octane number of 120–130.WEB, ETH Zurich,weblink Clean Engine Vehicle, 22 October 2010, 2015-01-23,weblink" title="web.archive.org/web/20150124010702weblink">weblink 2015-01-24, Besides use in road vehicles, CNG can also be used in aircraft.NEWS,weblink Take a look at some natural gas-powered airplanes, 6 November 2014, Well Said, Compressed natural gas has been used in some aircraft like the Aviat Aircraft Husky 200 CNGWEB,weblink American Firm Debuts First Airplane to Run on Natural Gas, Jason Paur, 31 July 2013, Wired, and the Chromarat VX-1 KittyHawkWEB,weblink Chomarat Present C-Ply KittyHawk with CNG Potential, 19 February 2014, Le Cheylard France, NGV Global News, LNG is also being used in aircraft. Russian aircraft manufacturer Tupolev for instance is running a development program to produce LNG- and hydrogen-powered aircraft.WEB,weblink Development of Cryogenic Fuel Aircraft, Tupolev, 2011-02-06, dead,weblink" title="web.archive.org/web/20101209165256weblink">weblink 9 December 2010, dmy-all, The program has been running since the mid-1970s, and seeks to develop LNG and hydrogen variants of the Tu-204 and Tu-334 passenger aircraft, and also the Tu-330 cargo aircraft. Depending on the current market price for jet fuel and LNG, fuel for an LNG-powered aircraft could cost 5,000 rubles (US$100) less per tonne, roughly 60%, with considerable reductions to carbon monoxide, hydrocarbon and nitrogen oxide emissions.The advantages of liquid methane as a jet engine fuel are that it has more specific energy than the standard kerosene mixes do and that its low temperature can help cool the air which the engine compresses for greater volumetric efficiency, in effect replacing an intercooler. Alternatively, it can be used to lower the temperature of the exhaust.

Fertilizers

Natural gas is a major feedstock for the production of ammonia, via the Haber process, for use in fertilizer production.

Hydrogen

{{See also|Industrial gas}}Natural gas can be used to produce hydrogen, with one common method being the hydrogen reformer. Hydrogen has many applications: it is a primary feedstock for the chemical industry, a hydrogenating agent, an important commodity for oil refineries, and the fuel source in hydrogen vehicles.

Animal and fish feed

Protein rich animal and fish feed is produced by feeding natural gas to Methylococcus capsulatus bacteria on commercial scale.WEB,weblink BioProtein Production, 31 January 2018, WEB,weblink Food made from natural gas will soon feed farm animals – and us, 31 January 2018, WEB,weblink New venture selects Cargill's Tennessee site to produce Calysta FeedKind® Protein, 31 January 2018,

Other

Natural gas is also used in the manufacture of fabrics, glass, steel, plastics, paint, and other products.NEWS,weblink Food made from natural gas will soon feed farm animals – and us, Le Page, Michael, 2016-11-10, New Scientist, 2016-12-13,

Environmental effects

{{See also|Environmental impact of the energy industry}}

Effect of natural gas release

{{update section|date=May 2019}}{{See also|Atmospheric methane}}Natural gas is mainly composed of methane. After release to the atmosphere it is removed by gradual oxidation to carbon dioxide and water by hydroxyl radicals ({{chem|O|H|-}}) formed in the troposphere or stratosphere, giving the overall chemical reaction {{chem|C|H|4}} + 2{{chem|O|2}} → {{chem|C|O|2}} + 2{{chem|H|2|O}}.BOOK, Environmental Chemistry, 9th, CRC press, 2010, 978-1420059205, Stanley Manahan, WEB, Methane: A Scientific Journey from Obscurity to Climate Super-Stardom, Gavin Schmidt,weblink September 2004, National Aeronautics and Space Administration. Goddard Institute for Space Studies, 11 June 2013, While the lifetime of atmospheric methane is relatively short when compared to carbon dioxide, with a half-life of about 7 years, it is more efficient at trapping heat in the atmosphere, so that a given quantity of methane has 84 times the global-warming potential of carbon dioxide over a 20-year period and 28 times over a 100-year period. Natural gas is thus a more potent greenhouse gas than carbon dioxide due to the greater global-warming potential of methane.BOOK, Myhre, G., D. Shindell, F.-M. Bréon, W. Collins, J. Fuglestvedt, J. Huang, D. Koch, J.-F. Lamarque, D. Lee, B. Mendoza, T. Nakajima, A. Robock, G. Stephens, T. Takemura and H. Zhang, 2013, Anthropogenic and Natural Radiative Forcing, Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change, Stocker, T.F., D. Qin, G.-K. Plattner, M. Tignor, S.K. Allen, J. Boschung, A. Nauels, Y. Xia, V. Bex, P.M. Midgley, 3, Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA,weblinkweblink 714, 10.1017/CBO9781107415324.018, 22 August 2014, 9781107415324, 2009 estimates by the EPA place global emissions of methane at {{convert|85|km3|e12cuft|abbr=off|sp=us}} annually,NEWS, Curbing Emissions by Sealing Gas Leaks,weblink The NY Times, 14 October 2009, 11 June 2013, or 3% of global production, {{convert|105|e12cuft|e12m3|abbr=off|sp=us|order=flip|disp=or}} (2009 est).WEB,weblink Wolfram Alpha, World Natural Gas Production, 2011-02-06, Direct emissions of methane represented 14.3% by volume of all global anthropogenic greenhouse gas emissions in 2004.WEB,weblink Climate Change — Climate Economics — International Analyses, U.S. Environmental Protection Agency, 2006-06-28, 2011-02-06,weblink" title="web.archive.org/web/20110202105341weblink">weblink 2011-02-02, dmy-all, During extraction, storage, transportation, and distribution, natural gas is known to leak into the atmosphere, particularly during the extraction process. In 2021 MethaneSAT should reduce the large uncertainties in the estimates.

Carbon dioxide emissions

{{update section|date=May 2019}}Natural gas is often described as the cleanest fossil fuel.{{citation needed|date=May 2019}} It produces 25–30% and 40–45% less carbon dioxide per joule delivered than oil and coal respectively, and potentially fewer pollutants than other hydrocarbon fuels.WEB,weblink Natural Gas in Asia: History and Prospects, Mikkal Herberg, (written for 2011 Pacific Energy Summit), The National Bureau of Asian Research, However, in absolute terms, it comprises a substantial percentage of human carbon emissions, and this contribution is projected to grow. According to the IPCC Fourth Assessment Report, in 2004, natural gas produced about 5.3 billion tons a year of {{chem|C|O|2}} emissions, while coal and oil produced 10.6 and 10.2 billion tons respectively. According to an updated version of the Special Report on Emissions Scenario by 2030, natural gas would be the source of 11 billion tons a year, with coal and oil now 8.4 and 17.2 billion respectively because demand is increasing 1.9% a year. According to Global Energy Monitor, gas pipelines built in the 2010s, especially in the United States, are locking in huge greenhouse gas emissions for 40 to 50 years at a time.NEWS, North American drilling boom threatens big blow to climate efforts, study finds,weblink The Guardian, 25 April 2019, To reduce its greenhouse emissions, the government of the Netherlands is subsidizing a transition away from natural gas for all homes in the country by 2050. In Amsterdam, no new residential gas accounts are allowed as of July 1, 2018, and all homes in the city are expected to be converted by 2040.WEB,weblink 1 Oct 2018, Van der Pekbuurt gaat als eerste Amsterdamse wijk van het aardgas af, nl, (to what?)

Other pollutants

Natural gas produces far lower amounts of sulfur dioxide and nitrous oxides than other fossil fuels. The pollutants due to natural gas combustion are listed below:WEB, Natural Gas and the Environment,weblink NaturalGas.org, 11 June 2013, dmy-all, dead,weblink" title="web.archive.org/web/20090503132200weblink">weblink 3 May 2009, WEB,weblink Gas vs Coal, global greenhouse warming, 2011-02-06, dmy-all, {| class="wikitable sortable"|+ Comparison of emissions from natural gas, oil and coal burning!Pollutant (lb/MMBtu)!! NG !! Oil !! Coal
Carbon dioxide >| 208
Carbon monoxide >| 0.208
Sulfur dioxide >| 2.591
Nitrogen oxides >| 0.457
Particulates >| 2.744
Mercury (element)>Mercury 0 0.000007 0.000016

Radionuclides

Natural gas extraction also produces radioactive isotopes of polonium (Po-210), lead (Pb-210) and radon (Rn-220). Radon is a gas with initial activity from 5 to 200,000 becquerels per cubic meter of gas. It decays rapidly to Pb-210 which can build up as a thin film in gas extraction equipment.WEB,weblink Naturally Occurring Radioactive Materials (NORM), World Nuclear Association, December 2016, 22 November 2017,

Safety concerns

(File:Gas pipeline odourant injection facility.JPG|thumb|A pipeline odorant injection station)The natural gas extraction workforce face unique health and safety challenges and is recognized by the National Institute for Occupational Safety and Health (NIOSH) as a priority industry sector in the National Occupational Research Agenda (NORA) to identify and provide intervention strategies regarding occupational health and safety issues.WEB,weblink CDC - NIOSH - NORA Oil and Gas Extraction Council, 2019-02-12, www.cdc.gov, 2019-03-14, WEB,weblink NORA Oil and Gas Extraction Council - Research Agenda, 2019-02-12, www.cdc.gov, 2019-03-14,

Production

Some gas fields yield sour gas containing hydrogen sulfide ({{chem|H|2|S}}), a toxic compound when inhaled. Amine gas treating, an industrial scale process which removes acidic gaseous components, is often used to remove hydrogen sulfide from natural gas.WEB,weblink Processing Natural Gas, NaturalGas.org, 2011-02-06, dead,weblink" title="web.archive.org/web/20110101053431weblink">weblink 1 January 2011, dmy-all, Extraction of natural gas (or oil) leads to decrease in pressure in the reservoir. Such decrease in pressure in turn may result in subsidence, sinking of the ground above. Subsidence may affect ecosystems, waterways, sewer and water supply systems, foundations, and so on.BOOK, Environmental Science, Chiras, Daniel, Jones & Bartlett Learning, 2012, 978-1-4496-1486-7, 283,weblink However, natural gas extraction can cause subsidence in the vicinity of the well. One notable example is in the Los Angeles–Long Beach harbor area, where extensive oil and gas extraction began in 1928 and has caused the ground to drop 9 meters (30 feet) in some areas., Google Books,

Fracking

Releasing natural gas from subsurface porous rock formations may be accomplished by a process called hydraulic fracturing or "fracking". It's estimated that hydraulic fracturing will eventually account for nearly 70% of natural gas development in North America.REPORT, National Petroleum Council, Prudent Development: Realizing the Potential of North America's Abundant Natural Gas and Oil Resources, September 2011,weblinkweblink 24 November 2017, Since the first commercial hydraulic fracturing operation in 1949, approximately one million wells have been hydraulically fractured in the United States.NEWS,weblink The Facts on Fracking, Susan L., Brantley, Anna, Meyendorff, 13 March 2013, New York Times, The production of natural gas from hydraulically fractured wells has utilized the technological developments of directional and horizontal drilling, which improved access to natural gas in tight rock formations.Fitzgerald, Timothy. "Frackonomics: Some Economics of Hydraulic Fracturing." Case Western Reserve Law Review 63.4 (2013). Web. 1 Sept. 2015. Strong growth in the production of unconventional gas from hydraulically fractured wells occurred between 2000–2012.Chojna, J., Losoncz, M., & Suni, P. (2013, November). Shale Energy Shapes Global Energy Markets. National Institute Economic Review.In hydraulic fracturing, well operators force water mixed with a variety of chemicals through the wellbore casing into the rock. The high pressure water breaks up or "fracks" the rock, which releases gas from the rock formation. Sand and other particles are added to the water as a proppant to keep the fractures in the rock open, thus enabling the gas to flow into the casing and then to the surface. Chemicals are added to the fluid to perform such functions as reducing friction and inhibiting corrosion. After the "frack," oil or gas is extracted and 30–70% of the frack fluid, i.e. the mixture of water, chemicals, sand, etc., flows back to the surface. Many gas-bearing formations also contain water, which will flow up the wellbore to the surface along with the gas, in both hydraulically fractured and non-hydraulically fractured wells. This produced water often has a high content of salt and other dissolved minerals that occur in the formation.JOURNAL, Yeboah, N.N.N., Burns, S.E., 2011, Geological Disposal of Energy-Related Waste, KSCE Journal of Civil Engineering, 15, 4, 701–702, 10.1007/s12205-011-0010-x, The volume of water used to hydraulically fracture wells varies according to the hydraulic fracturing technique. In the United States, the average volume of water used per hydraulic fracture has been reported as nearly 7,375 gallons for vertical oil and gas wells prior to 1953, nearly 197,000 gallons for vertical oil and gas wells between 2000–2010, and nearly 3 million gallons for horizontal gas wells between 2000–2010.REPORT, Gallegos, Tanya J., Brian A., Varela, Trends in Hydraulic Fracturing Distributions and Treatment Fluids, Additives, Proppants, and Water Volumes Applied to Wells Drilled in the United States through 1947 through 2010—Data Analysis and Comparison to the Literature, U.S. Geological Survey, Scientific Investigations Report 2014.5131, 2015, 11, Web. 2,weblink Determining which fracking technique is appropriate for well productivity depends largely on the properties of the reservoir rock from which to extract oil or gas. If the rock is characterized by low-permeability — which refers to its ability to let substances, i.e. gas, pass through it, then the rock may be considered a source of tight gas.WEB,weblink Our responsibility: Limit the impact of our industrial operations, Total.com, Total, Fracking for shale gas, which is currently also known as a source of unconventional gas, involves drilling a borehole vertically until it reaches a lateral shale rock formation, at which point the drill turns to follow the rock for hundreds or thousands of feet horizontally.WEB,weblink Shale Gas and Other Unconventional Sources of Natural Gas, Union of Concerned Scientists, In contrast, conventional oil and gas sources are characterized by higher rock permeability, which naturally enables the flow of oil or gas into the wellbore with less intensive hydraulic fracturing techniques than the production of tight gas has required.WEB,weblink How is Shale Gas Produced?, Energy.gov, WEB,weblink U.S. Average Depth of Natural Gas Developmental Wells Drilled, U.S. Energy Information Administration (eia), The decades in development of drilling technology for conventional and unconventional oil and gas production has not only improved access to natural gas in low-permeability reservoir rocks, but also posed significant adverse impacts on environmental and public health.WEB, 30 October 2012,weblink The Environmental and Occupational Health Impacts of High-Volume Hydraulic Fracturing of Unconventional Gas Reserves, APHA, WEB, 6 October 2014, Center for Biological Diversity,weblink Documents Reveal Billions of Gallons of Oil Industry Wastewater Illegally Injected Into Central California Aquifers, JOURNAL, Sharp increase in central Oklahoma seismicity since 2008 induced by massive wastewater injection, K.M., Keranen, M., Weingarten, G.A., Abers, B.A., Bekins, S., Ge, 25 July 2014, Science, 345, 6195, 448–451, 10.1126/science.1255802, 24993347, 2014Sci...345..448K, WEB,weblink Key Greenhouse Gas Study May Have Systematically Understated Methane Leaks, Sharon, Kelly, 6 August 2015, AlterNet, JOURNAL, Methane contamination of drinking water accompanying gas-well drilling and hydraulic fracturing, Stephen G., Osborn, Avner, Vengosh, Nathaniel R., Warner, Robert B., Jackson, 17 May 2011, Proceedings of the National Academy of Sciences, 108, 20, 8172–8176, 10.1073/pnas.1100682108, 21555547, 3100993, 2011PNAS..108.8172O, The US EPA has acknowledged that toxic, carcinogenic chemicals, i.e. benzene and ethylbenzene, have been used as gelling agents in water and chemical mixtures for high volume horizontal fracturing (HVHF).WEB, U.S. Environmental Protection Agency,weblink Quality Assurance Project Plan For The Chemical Characterization Of Select Constituents Relevant to Hydraulic Fracturing, 18 October 2012, 22 November 2017, Following the hydraulic fracture in HVHF, the water, chemicals, and frack fluid that return to the well's surface, called flowback or produced water, may contain radioactive materials, heavy metals, natural salts, and hydrocarbons which exist naturally in shale rock formations.JOURNAL, Howarth, Robert W., Should Fracking Stop?, Nature, 477, 7364, 271–275, 15 September 2011, 10.1038/477271a, 21921896, Fracking chemicals, radioactive materials, heavy metals, and salts that are removed from the HVHF well by well operators are so difficult to remove from the water they're mixed with, and would so heavily pollute the water cycle, that most of the flowback is either recycled into other fracking operations or injected into deep underground wells, eliminating the water that HVHF required from the hydrologic cycle.WEB,weblink As Texas Withers, Gas Industry Guzzles, Mother Jones, Josh Harkinson, 1 September 2011, 22 November 2017,

Added odor

Natural gas in its native state is colorless and almost odorless. In order to assist consumers in detecting leaks, an odorizer with a scent similar to rotten eggs, tert-Butylthiol (t-butyl mercaptan), is added. Sometimes a related compound, thiophane, may be used in the mixture. Situations in which an odorant that is added to natural gas can be detected by analytical instrumentation, but cannot be properly detected by an observer with a normal sense of smell, have occurred in the natural gas industry. This is caused by odor masking, when one odorant overpowers the sensation of another. As of 2011, the industry is conducting research on the causes of odor masking.JOURNAL, Rawson, Nancy, Quraishi, Ali, Bruno, Thomas J., 2011, Findings and Recommendations From the Joint NIST—AGA Workshop on Odor Masking, Journal of Research of the National Institute of Standards and Technology, 116, 6, 839–848, 10.6028/jres.116.026, 4551224,

Risk of explosion

File:Fire engines in Kiev, Ukraine.JPG|thumb|Gas network emergency vehicle responding to a major fire in Kiev, UkraineUkraineExplosions caused by natural gas leaks occur a few times each year. Individual homes, small businesses and other structures are most frequently affected when an internal leak builds up gas inside the structure. Frequently, the blast is powerful enough to significantly damage a building but leave it standing. In these cases, the people inside tend to have minor to moderate injuries. Occasionally, the gas can collect in high enough quantities to cause a deadly explosion, disintegrating one or more buildings in the process. The gas usually dissipates readily outdoors, but can sometimes collect in dangerous quantities if flow rates are high enough. From 1994 through 2013, the United States had 745 serious incidents with gas distribution, causing 278 fatalities and 1059 injuries, with $110,658,083 in property damageweblink However, considering the tens of millions of structures that use the fuel, the individual risk of using natural gas is very low.

Risk of carbon monoxide inhalation

Natural gas heating systems may cause carbon monoxide poisoning if unvented or poorly vented. In 2011, natural gas furnaces, space heaters, water heaters and stoves were blamed for 11 carbon monoxide deaths in the US. Another 22 deaths were attributed to appliances running on liquified petroleum gas, and 17 deaths on gas of unspecified type. Improvements in natural gas furnace designs have greatly reduced CO poisoning concerns. Detectors are also available that warn of carbon monoxide and/or explosive gas (methane, propane, etc.).US Consumer Product Safety Commission, Non-Fire Carbon Monoxide Deaths, 2011 Annual Estimate, September 2014.

Energy content, statistics, and pricing

{{see also|Billion cubic metres of natural gas}}File:Henry hub NG prices.svg|thumb|upright=1.5|Natural gas prices at the Henry HubHenry Hub(File:Natural Gas Price Comparison.png|thumb|upright=1.5|Comparison of natural gas prices in Japan, United Kingdom, and United States, 2007–2011)Quantities of natural gas are measured in normal cubic meters (cubic meter of gas at "normal" temperature {{convert|0|°C|°F|abbr=on}} and pressure {{convert|101.325|kPa|psi|abbr=on}}) or standard cubic feet (cubic foot of gas at "standard" temperature {{convert|60.0|°F|°C|abbr=on}} and pressure {{convert|14.73|psi|kPa|abbr=on}}), {{convert|1|m3|cuft|4|spell=in|sp=us|disp=x| â‰ˆ }}. The gross heat of combustion of commercial quality natural gas is around {{convert|39|MJ/m3|kWh/cuft|abbr=on}}, but this can vary by several percent. This is about {{convert|49|MJ/kg|abbr=on}} (assuming a density of {{convert|0.8|kg/m3|lb/cuft|abbr=on|sigfig=1}},WEB, teknopoli,weblink Gas Density, Molecular Weight and Density, an approximate value).

European Union

Gas prices for end users vary greatly across the EU.WEB,weblink Energy Prices Report, Europe's Energy Portal, 11 June 2015, A single European energy market, one of the key objectives of the EU, should level the prices of gas in all EU member states. Moreover, it would help to resolve supply and global warming issues,WEB, European Commission,weblink Market analysis, 11 June 2015, as well as strengthen relations with other Mediterranean countries and foster investments in the region.JOURNAL, Farah, Paolo Davide, Offshore Natural Gas Resources in the Eastern Mediterranean in the Relations to the European Union: A Legal Perspective through the Lenses of MedReg, Journal of World Energy Law and Business, 2015, 8, 8, 2695964,

United States

(File:US Natural Gas Production.svg|thumb|upright=1.5|US Natural Gas Marketed Production 1900 to 2012 (US EIA data))(File:Gas Production Top 5 Countries.png|thumb|upright=1.5|Trends in the top five natural gas-producing countries (US EIA data))In US units, {{convert|1|cuft|L |adj=pre|standard |spell=in}} of natural gas produces around {{convert |1028|btu |kJ|lk=in}}. The actual heating value when the water formed does not condense is the net heat of combustion and can be as much as 10% less.weblink" title="web.archive.org/web/20100531191519weblink">Heat value definitions. WSU website. Retrieved 2008-05-19.In the United States, retail sales are often in units of therms (th); 1 therm = 100,000 BTU. Gas sales to domestic consumers are often in units of 100 standard cubic feet (scf). Gas meters measure the volume of gas used, and this is converted to therms by multiplying the volume by the energy content of the gas used during that period, which varies slightly over time. The typical annual consumption of a single family residence is 1,000 therms or one Residential Customer Equivalent (RCE). Wholesale transactions are generally done in decatherms (Dth), thousand decatherms (MDth), or million decatherms (MMDth). A million decatherms is a trillion BTU, roughly a billion cubic feet of natural gas.The price of natural gas varies greatly depending on location and type of consumer. In 2007, a price of $7 per 1000 cubic feet ({{convert|.007|$/cuft|$/m3|disp=out}}) was typical in the United States. The typical caloric value of natural gas is roughly 1,000 BTU per cubic foot, depending on gas composition. This corresponds to around $7 per million BTU or around $7 per gigajoule (GJ). In April 2008, the wholesale price was $10 per 1000 cubic feet ($10/MMBTU).WEB, James L. Williams,weblink NYMEX Natural Gas Futures, WTRG Economics , 1998-10-02, 2017-11-22, The residential price varies from 50% to 300% more than the wholesale price. At the end of 2007, this was $12–$16 per 1000 cubic feet ({{convert|.012|–|.016|$/cuft|$/m3|disp=out}}).WEB,weblink U.S. Natural Gas Prices, U.S. Energy Information Agency, 2012-08-21, Natural gas in the United States is traded as a futures contract on the New York Mercantile Exchange. Each contract is for 10,000 MMBTU or {{convert|10|e9BTU|GJ|0|abbr=unit}}. Thus, if the price of gas is $10/MMBTU on the NYMEX, the contract is worth $100,000.

Canada

Canada uses metric measure for internal trade of petrochemical products. Consequently, natural gas is sold by the gigajoule (GJ), cubic meter (m3) or thousand cubic meters (E3m3). Distribution infrastructure and meters almost always meter volume (cubic foot or cubic meter). Some jurisdictions, such as Saskatchewan, sell gas by volume only. Other jurisdictions, such as Alberta, gas is sold by the energy content (GJ). In these areas, almost all meters for residential and small commercial customers measure volume (m3 or ft3), and billing statements include a multiplier to convert the volume to energy content of the local gas supply.A gigajoule (GJ) is a measure approximately equal to half a barrel (250 lbs) of oil, or 1 million BTUs, or {{convert|1000|ft3|m3|disp=or|abbr=on}} of gas. The energy content of gas supply in Canada can vary from {{convert|37|to|43|MJ/m3|abbr=on}} depending on gas supply and processing between the wellhead and the customer.

Elsewhere

Outside of the European Union, the U.S., and Canada, natural gas is sold in gigajoule retail units. LNG (liquefied natural gas) and LPG (liquefied petroleum gas) are traded in metric tonnes (1,000 kg) or MMBTU as spot deliveries. Long term natural gas distribution contracts are signed in cubic meters, and LNG contracts are in metric tonnes. The LNG and LPG is transported by specialized transport ships, as the gas is liquified at cryogenic temperatures. The specification of each LNG/LPG cargo will usually contain the energy content, but this information is in general not available to the public.In the Russian Federation, Gazprom sold approximately {{convert|250|e9m3|abbr=off|sp=us}} of natural gas in 2008. In 2013 they produced {{convert|487.4|e9m3|abbr=off|sp=us}} of natural and associated gas. Gazprom supplied Europe with {{convert|161.5|e9m3|abbr=off|sp=us}} of gas in 2013.In August 2015, possibly the largest natural gas discovery in history was made and notified by an Italian gas company ENI. The energy company indicated that it has unearthed a "supergiant" gas field in the Mediterranean Sea covering about {{convert|40|sqmi}}. It was also reported that the gas field could hold a potential {{convert|30|e12cuft|abbr=off|sp=us}} of natural gas. ENI said that the energy is about{{convert|5.5|e9BOE|abbr=~}}. The field was found in the deep waters off the northern coast of Egypt and ENI claims that it will be the largest ever in the Mediterranean and even the world.WEB, CNN Money, 30 August 2015,weblink Natural gas discovery could be largest ever, David, Goldman,

Natural gas as an asset class for institutional investors

Research conducted by the World Pensions Council (WPC){{when|date=March 2014}} suggests that large US and Canadian pension funds and Asian and MENA area SWF investors have become particularly active in the fields of natural gas and natural gas infrastructure, a trend started in 2005 by the formation of Scotia Gas Networks in the UK by OMERS and Ontario Teachers' Pension Plan.{{citation needed|date=March 2014}}

Adsorbed natural gas (ANG)

Natural gas may be stored by adsorbing it to the porous solids called sorbents. The optimal condition for methane storage is at room temperature and atmospheric pressure. Pressures up to 4 MPa (about 40 times atmospheric pressure) will yield greater storage capacity. The most common sorbent used for ANG is activated carbon (AC), primarily in three forms: Activated Carbon Fiber (ACF), Powdered Activated Carbon (PAC), activated carbon monolith.WEB,weblink Adsorbed Natural Gas, scopeWe – a Virtual Engineer, 11 June 2015,

See also

General:

References

{{Reflist}}

External links

{{Fuel gas}}{{Authority control}}

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