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· In situ stress is not only a vital indicator for selecting explorative regions of coalbed methane (CBM), but also a pivotal factor affecting CBM production. The present study explored whether in situ stress affected the development potential of CBM in western Guizhou, China. To this end, we collected injection/falloff well test data and gas …
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The coal depth acquired in this study varied from 480 to 1350 m, with a breakdown pressure recorded during the injection/falloff test varied from 8.17 to 33.08 MPa, averaging of 16.68 MPa.
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· Keywords: Coal Coalbed Methane (CBM), Unde rgro und Coal Gas ific atio n (U CG) Permeability Injection Falloff Test (IFT) Bangladesh Introduction The coal deposits of the Permian Gondwana Group
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· Permeability and pressure are two important parameters for characterizing coal reservoirs and for evaluating coalbed methane (CBM) production potential. In this study, the reservoir pressure and permeability of six steel-cased CBM wells at Yuwu Coal Mine (Luan coal mining area, Qinshui Basin, China) were studied using new injection …
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· In the past two decades, research on CO2 storage in coal seams and simultaneously enhanced coalbed methane recovery (ECBM) has attracted a lot of attention due to its win–win effect between greenhouse gas (CO2) emission reduction and coalbed methane recovery enhancement. This paper presents an overview on the …
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Based on log interpretation, the packer is installed on the immediate roof using tubing strings, and the pump injection system and underground equipment are connected through the pipelines. Then, the injection/falloff test and in situ stress measurement are carried out successively.
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Abstract: Numerical well testing is used mostly in oil/gas, geothermal, and coalbed methane injection/falloff well-testing interpretations while few published studies have been presented on
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Dynamic Well Testing in Petroleum Exploration and Development, Second Edition, describes the process of obtaining information about a reservoir through examining and analyzing the pressure-transient response caused by a change in production rate. The book provides the reader with modern petroleum exploration and well testing interpretation …
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· Third, injection/falloff tests typically investigate larger reservoir volumes than slug tests or buildup tests, especially in underpressured reservoirs, which cannot flow fluids to the surface. Well-test permeability is a critical parameter for estimating CBM production rates and ultimate recovery.
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· Numerical well testing is used mostly in oil/gas, geothermal, and coalbed methane injection/falloff well-testing interpretations while few published studies have been presented on how to adjust the models and numerical experiments parameters. Meanwhile, there is no simple and highly applicable evaluation standard on the approximation …
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The measurement and analysis of pressure data taken after an injection well is shut in. These data are often the easiest transient well-test data to obtain. Wellhead pressure rises during injection, and if the well remains full of liquid after shut-in of an injector, the pressure can be measured at the surface, and bottomhole pressures can be calculated by adding …
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· Injection/falloff method was used for the well test and data acquisition, and the wells were tested after completion and before production. To conduct a full cycle of injection/falloff test, water was injected at a constant rate for a period of time, causing a higher pressure distribution near the well bore, and then shut in the well.
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· Fundamentals of Coalbed Methane Reservoir Engineering. Author John Seidle has written this much-needed introduction to a unique unconventional gas resource for students and practicing engineers as well as a basic handbook for those who are involved in coalbed methane on a daily basis and require straightforward, practical …
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· The in situ stress measurement with multiple-cycle hydraulic fracturing method was conducted after the injection falloff test. 19 This method involves the repeated injection of fluid at increasing pressure levels to …
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