Coalbed methane resource development can not only reduce the natural emission of a greenhouse gas and ensure full energy utilization, but it can also allow safer coal mining and reduce the risk of underground disasters like gas and coal outbursts and fires from spontaneous combustion (Wang et al., 2012; Zou et al., 2020).
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Coalbed methane production began in the 1980s; shale gas extraction is even more recent. The main enabling technologies, hydraulic fracturing and horizontal drilling, have opened up new areas for oil and gas development, with particular focus on natural gas reservoirs such as shale, coalbed and tight sands. Shale Gas Extraction.
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Although the interaction of gas and coal has been comprehensively investigated in coalbed methane (CBM) extraction process, fewer scholars have taken the effect of temperature and groundwater into account, which brought a large deviation for CBM extraction design. In this study, a fully coupled thermalhydraulicmechanical model (THM) including coal deformation, gas seepage, water seepage ...
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During the coalification process, methane gas is captured in the coal seams and later released during coal mining operations. Coal bed methane separation is crucial for both economic benefit and ...
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Injection of hightemperature water or steam into lowpermeability coalbed for efficient and rapid extraction of coalbed methane has been studied by our university for many years and will soon be implemented in the field. With comprehensive consideration of coupling of heat transfer, water seepage, desorption of coalbed methane, and coalrock mass deformation, the paper establishes a more ...
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the second process, the thermogenic methane, constitutes bulk of the coal bed methane. The gas generation, by this process, begins at vitrinite reflectance (R0 max) values of %, peaks
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Methane extraction principle and process. CBM mining includes coal bed methane (CBM) and abandoned mine methane (AMM). The most important characteristic of CBM that is different from conventional natural gas is that CBM is mainly stored in the coal seam in the adsorption state.
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ment of more effective coal bed methane produced water management practices. More effective practices will help to ensure the stewardship of water resources, particularly in the arid West. Figure 4. Ponds storing coal bed methane produced water in Wyoming. The green parcels are fi elds irrigated with coal bed methane produced water. S o u r c ...
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Coalbed methane is an abundant form of natural gas extracted from coal beds. Coalbed methane is viewed as a cleaner energy source versus petroleum and coal combustion because methane extraction, transport and use are more efficient and less polluting. However, coalbed methane contains high amounts of CO2 that induce solidification during liquefaction. Therefore, CO2 has to be reduced below 2% ...
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Coalbed Methane Extraction:Detailed Study Report December 2010 11 1. EXECUTIVE SUMMARY/INTRODUCTION This report summarizes the information collected and analyzed by the Environmental Protection Agency (EPA) as part of a study of the coalbed methane (CBM) extraction industry. Currently, CBM discharges are not covered by an Effluent Limitation
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In the process of coalbed methane extraction, the recovery rate through pressure reduction is low, usually less than 50%. However, gas injection into the reservoir not only maintains the pressure easily but also achieves the purpose of continuous extraction . In this regard, domestic and foreign personnel have conducted pilot tests in the ...
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Coalbed methane (CBM) drilling and completion technologies (DCTs) are significant basis for achieving efficient CBM exploration and exploitation. Characteristics of CBM reservoirs vary in different regions around the world, thereby, it is crucial to develop, select and apply the optimum DCTs for each different CBM reservoir. This paper firstly reviews the development history of CBM DCTs ...
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In this work, a fully coupled thermalhydraulicmechanical model with twophase flow for coalbed methane extraction was proposed including coal deformation, gas seepage, water seepage, and thermal transport governing equations. Different coupled models and the influence of several key factors on CBM extraction process were analyzed.
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Coal Bed Methane (CBM) is an unconventional form of natural gas coal deposits or coal seams. CMB is formed during the process of coalification, the transformation of plant material into coal. It is considered a valuable energy resource with reserves and production having grown nearly every year since 1989. Varied methods of recovery make CBM a ...
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During the extraction process, the water block effect seriously affects methane extraction in a coalbed. Detonation wave fracturing technology can result in the formation of a stressconcentrated area in the coalbed, thus increasing the possibility of accidents. ... This indicated that the competitive adsorption between CO 2 and CH 4 was a ...
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A novel multilateral well for coalbed methane extraction was proposed in the study. There is a main wellbore at the longitudinal center of coal seam and four lateral wells at the horizontal center in the multilateralwell system. Compared with traditional drainage holes, multilateralwell system has a better performance on coalbed methane development. A hydraulicmechanical coupling model of ...
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A deep understanding of the process of coalbed methane (CBM) extraction is of significance for both the unconventional energy supply and mine safety. The effects of stimulation patterns and thermal effects (including thermal shrinkage, nonisothermal sorption, and gas density change) significantly affect the CBM extraction thermal effects on CBM extraction have been ...
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Figure 5 shows the variation of coalbed methane pressure with different initial coalbed permeability. As illustrated in Figure 5, the greater the initial coalbed permeability, the better the methane extraction effect of hydraulic fracturing the initial coalbed permeability k 0 = 5 t10 −17 m 2, 9 910 −17 m 2, 13 110 −17 m 2, 17 110 −17 m 2, after 3650 d of extraction, the ...
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Coal bed methane, also known as coal seam gas or coalbed gas, is a form of natural gas recovered from coal beds. It is considered a clean energy source, contributing to its popularity. Countries like the USA, Australia, and Canada have seen significant development of CBM as an energy source. CBM consists of methane adsorbed into the coal matrix ...
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Teng et al. put forward that temperature is the key factor affecting CBM extraction, and coal bed heating can effectively promote methane desorption and improve the efficiency of CBM extraction [14]. ... but there is little research on the heat and energy changes in the process of methane adsorption and desorption under the restriction of ...
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Coalbed methane. A German methane detector used for coal mining in the 1960s. Coalbed methane ( CBM or coalbed methane ), [1] coalbed gas, or coal seam gas ( CSG [1]) is a form of natural gas extracted from coal beds. [2] In recent decades it has become an important source of energy in United States, Canada, Australia, and other countries.
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The coal's permeability plays a crucial role in coalbed methane (CBM) extraction and coal seam CO 2 sequestration. An accurate understanding of permeability rebound and recovery is therefore essential. ... During the permeability evolution process, coal permeability rebound and recovery is an important behaviour. Currently, studies on it ...
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When rockbursts and coal and gas outbursts simultaneously occur in a coal mine, changes in gas adsorption (concentration of ambient methane) and displacement of coal and rock must occur. The coassociated minerals in coal reservoirs can affect the mechanical properties and methane adsorption capacity, which are commonly disregarded. It is important to construct compound molecular structure ...
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1 INTRODUCTION. Coalbed methane (CBM) is an unconventional methane resource with plentiful reserves and is considered a source of clean energy. Global recoverable CBM reserves are estimated at 49 × 10 12 m 3, which accounts for % of the world's unconventional methane resources. 13 Moreover, to prevent and control coal mine methane disasters, many technologies have been developed to ...
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Gas is stored in micropores on the coal surface in coalbed methane (CBM) reservoirs, mainly via adsorption 1, order to release CBM from the coal and produce gas through the cleat system, the ...
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Using 2 methanefueled extraction units, the project recovers methane from 3 gob wells via a 10inchdiameter gathering pipeline. The abandoned mine methane is sent to an enclosed flare manufactured by Perennial Energy, which has a capacity of 72 million British thermal units/hour. The flare has successfully operated over a wide range of methane
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CBM refers to methane that is found in and extracted from coal seams. It is formed during the coalification process, which is the transformation of organic plant material into coal. CBM is also known as coal seam methane or coal seam gas, and is widely considered an "unconventional" source of natural gas.
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Introduction. Coalbed methane (CBM), as a byproduct of coal, is a clean and highefficiency fuel [1], [2]. The energy released in the combustion of 1 m 3 of methane is million Joules, equivalent to the combustion of kg of standard coal. Although it is a highly efficient energy source, methane can also be the cause of serious disasters that kill hundreds of people every year in China [3].
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The extraction process of CBM involves the dewatering of coal seams, enabling the release of trapped methane gas [1].However, one of the primary challenges encountered during CBM production is the significant amount of water that accompanies the extracted gas [2].This water, known as produced water, poses a major problem in terms of treatment, disposal, and potential environmental impacts.
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The commercial extraction of methane from coal beds is now well established in a number of countries throughout the world, including the USA, Australia, China, India and Canada. Because coal is almost pure carbon, its reservoir character is fundamentally different to conventional gas plays. Coalbed methane (CBM) forms as either biogenically or ...
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The mining induced permeability enhancement technique was conceptually illustrated in Fig. 1. Effective extraction of gas in adjacent gassy seam(s) could significantly decrease the gas content and pressure in the seam, thus realizing the objective of extraction of both coal and methane in a safe environment [6], [11], [18], [26], [27].
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Extraction of coal bed methane is not without controversy. CBM extraction involves pumping large volumes of water from coal seams in order to release water pressure that traps gas within the coal. The quantity, quality, and dispersal of this water is a source of much debate. Each well is expected to produce approximately 5 to 20 gallons of ...
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