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Numerical modeling of the dynamic variation in multiphase CH 4 during CO 2 enhanced gas recovery from depleted shale reservoirs
Frontiers of Earth Science ( IF 1.8 ) Pub Date : 2021-03-24 , DOI: 10.1007/s11707-021-0869-x
Lijun Cheng , Ye Zhang , Jun Liu , Zhaohui Lu , Chunlin Zeng , Peng Zhao

Regarding CO2 enhanced shale gas recovery, this work focuses on changes in the multiphase (free/adsorbed) CH4 in the process of CO2 enhanced shale gas recovery, by utilizing a rigorous numerical model with real geological parameters. This work studies nine injection well (IW) and CH4 production well (PW) combinations of CO2 to determine the influence of IW and PW locations on the dynamic interaction of multiphase CH4 during 10000 d of CO2 injection. The results indicate that the content of both the adsorbed CH4 and free CH4 is strongly variable before (and during) the CO2-CH4 displacement. In addition, during the simulation process, the proportion of the adsorbed CH4 among all extracted CH4 phases dynamically increases first and then tends to stabilize at 70%–80%. Moreover, the IW-PWs combinations significantly affect the outcomes of CO2 enhanced shale gas recovery — for both the proportion of adsorbed/free CH4 and the recovery efficiency. A longer IW-PW distance enables more adsorbed CH4 to be recovered but results in a lower efficiency of shale gas recovery. Basically, a shorter IW-PWs distance helps recover CH4 via CO2 injection if the IW targets the bottom layer of the Wufeng-Longmaxi shale formation. This numerical work expands the knowledge of CO2 enhanced gas recovery from depleted shale reservoirs.



中文翻译:

贫页岩油藏CO 2强化采气过程中多相CH 4动态变化的数值模拟

关于CO 2增强页岩气体回收,此工作的重点是在多相(游离/吸附)CH变化4中CO的过程2增强页岩气体回收,通过利用与实际地质参数严格数值模型。这项工作研究了CO 2的9个注入井(IW)和CH 4生产井(PW)组合,以确定在10000 d CO 2注入期间IW和PW位置对多相CH 4动力相互作用的影响。结果表明,吸附的CH 4和游离CH 4的含量在CO 2 -CH之前(和期间)变化很大。4排量。此外,在模拟过程中,所有提取的CH 4相中吸附的CH 4的比例首先动态增加,然后趋于稳定在70%–80%。此外,IW-PWs组合显着影响CO 2提高页岩气回收率的结果-无论是吸附的游离CH 4的比例还是回收效率。更长的IW-PW距离可以回收更多吸附的CH 4,但导致页岩气回收效率较低。基本上,较短的IW-PWs距离有助于通过CO 2回收CH 4如果IW瞄准五峰—龙马溪组页岩层的底层,则进行注入。这项数值研究扩展了从贫化页岩气藏中提高CO 2采收率的知识。

更新日期:2021-03-24
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