注热联合井群开采煤层气运移采出规律数值模拟

doi:10.13278/j.cnki.jjuese.20180199

摘要/Abstract

摘要： 为总结注热联合井群开采低渗透储层煤层气运移采出规律，基于传热学、弹性力学、渗流力学、岩石力学理论，建立了注蒸汽开采低渗透储层煤层气藏过程的热固流耦合数学模型。结合潞安矿区山西组3#煤层地质参数，利用有限元软件进行了注热联合井群开采煤层气藏运移规律的数值模拟，得到了不同布井方式下注热10 d、开采100 d过程中煤层温度场、应力场及煤层气渗流场变化规律。结果显示，煤层平均传热速度为1.57 m/d，注热10 d后，中心井35 m范围内为有效注热区；随井筒数量的增加和井间距的减小，井间干扰作用增强，煤储层压力下降加快，煤层气供气及解吸区域增加，累积产量显著增加。七井模型20 m井间距注热开采累积产气量是五井模型30 m井间距未注热开采累积产气量的2.01倍。模拟结果显示了注热和井间干扰开采优势，为低渗透储层煤层气井群注热联合工业开采提供理论依据。

关键词: 低渗透储层煤层气, 注热开采, 热固流耦合, 井间干扰, 数值模拟

Abstract: In order to obtain the migration and output laws of low permeability coalbed methane in mining of well group combined with thermal injection, a coupled thermal-solid-fluid mathematical model of coalbed methane was developed based on the theory of heat transfer, elastic mechanics, seepage mechanics, and rock mechanics. Combined with the geological parameters of 3# coal seam of Shanxi Formation in Lu'an mining area, the finite software was utilized to simulate seepage rules in the mining process. Under different well pattern, 10 d thermal stimulation and 100 d mining were carried out respectively, and the curves of related parameters, temperature, and stress and gas pressure variation were drawn. The results show that the average velocity of heat transfer of coal seam is 1.57 m/d after 10 d steam injection in the 35 m effective area of thermal stimulation. With the increase of well number and the decrease of well spacing, along the radial direction of well,the well group interference is strengthened, the reservoir pressure drops more quickly, the gas desorption area increases, and the production of well is promoted significantly. The production of cumulative coalbed methane of seven wells heat injection with 20 m well-bore spacing is 2.01 times of that of five wells with 30 m well-bore spacing without heat injection. The simulation results show the advantages of heat injection and inter-well interference,and provide a theoretical basis for coalbed methane mining technology of multi-well combined with thermal injection in low permeability reservoirs.

Key words: low permeability coal-bed methane, thermal stimulation mining, thermal-solid-fluid coupling, inter-well interference, numerical simulation

中图分类号:

TE377

杨新乐, 秘旭晴, 张永利, 李惟慷, 戴文智, 王亚鹏, 苏畅. 注热联合井群开采煤层气运移采出规律数值模拟[J]. 吉林大学学报(地球科学版), 2019, 49(4): 1100-1108.

Yang Xinle, Bi Xuqing, Zhang Yongli, Li Weikang, Dai Wenzhi, Wang Yapeng, Su Chang. Numerical Simulation of Migration and Output Law of Coal-Bed Methane in Heat Injection Combined Well Group Mining[J]. Journal of Jilin University(Earth Science Edition), 2019, 49(4): 1100-1108.

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