Permeability evolution and production characteristics of inclined coalbed methane reservoirs on the southern margin of the Junggar Basin, Xinjiang, China

被引:9
作者
Liang, Shun [1 ,2 ,3 ,5 ]
Liang, Yaowu [1 ]
Elsworth, Derek [2 ]
Yao, Qiangling [1 ,2 ]
Fu, Xuehai [3 ]
Kang, Junqiang [2 ,3 ]
Hao, Yisong [1 ]
Wang, Meng [4 ]
机构
[1] China Univ Min & Technol, Sch Mines, Key Lab Deep Coal Resource Min, Minist Educ, Xuzhou 221008, Jiangsu, Peoples R China
[2] Penn State Univ, EMS Energy Inst, Ctr & Energy & Mineral Engn G3, University Pk, PA 16802 USA
[3] China Univ Min & Technol, Key Lab CBM Resources & Reservoir Format Proc, Minist Educ, Xuzhou 221008, Jiangsu, Peoples R China
[4] Henan Polytech Univ, Sch Energy Sci & Engn, Jiaozuo 454003, Henan, Peoples R China
[5] China Univ Min & Technol, Sch Mines, Room A601,1 Daxue Rd, Xuzhou 221116, Jiangsu Provinc, Peoples R China
基金
中国国家自然科学基金;
关键词
Inclined coalbed methane reservoir; Asymmetric distribution; Coalbed methane; Permeability; Reservoir pressure; LOW-RANK COAL; GEOLOGICAL CONDITIONS; ORDOS BASIN; GAS-FLOW; STRESS; MODEL; DEFORMATION; DESORPTION; AREA; PRESSURE;
D O I
10.1016/j.ijrmms.2023.105581
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
The thick and steeply inclined coal seams of the Junggar Basin of Xinjiang, China, are unique with dip angles generally >50 degrees but over the range 0 degrees-85 degrees. Initial and evolving permeability and pressures change drastically around wells down-dip within the steeply inclined reservoir as a result of the depth differential. Hence, the evolution of permeability and fluid pressures during drainage exhibits significant differences from those of flat-lying or even slightly inclined reservoirs. We apply a hydro-mechanical model to evaluate the interaction of two-phase flows of gas and water in the inclined system. The influence of different reservoir inclinations (15 degrees, 30 degrees, 45 degrees, 60 degrees, and 75 degrees) on the evolution of permeability, reservoir pressure, and gas production are explored through finite element modeling of this system. The results show that: 1) Reservoir inclination induces differences in permeability, reservoir pressure, gas content and methane production between the shallower updip reservoir and deeper downdip reservoir. The difference in permeability between the updip and downdip reservoirs is amplified as the dip angle increases and as drainage proceeds in the presence of the varying stress gradient. 2) An apparent asymmetric distribution of reservoir pressures results for wells along dip. The difference in reservoir pressure between the updip and downdip reservoirs intensifies as the inclination increases but lessens with the progress of drainage. The larger the dip angle, the smaller the final reservoir pressure. 3) The pressure reduction in the updip reservoir is larger than that in the downdip reservoir, resulting in the unsynchronized desorption of methane in the updip and downdip reservoirs. Methane within the updip reservoir desorbs preferentially over that in the downdip reservoir. For reservoir dip angles <45 degrees a single peak in methane production rate is apparent but this is supplanted by dual peaks for inclinations >45 degrees. The time gap in gas desorption between the updip and downdip reservoirs results in the "dual-peak" on gas production profile. 4) A larger well spacing along the dip of a more highly inclined reservoir results in more efficient water drainage and gas production. An inverted trapezoidal well pattern is recommended to facilitate the drainage and gas production of reservoirs with significant dip angles.
引用
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页数:18
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