CAJ | 학술논문

从 CO2置换页岩气吸附气开采机理入手，通过页岩等温吸附、直接降压解析、注 CO2置换解析实验评价方法，探讨利用 CO2分子置换页岩气吸附气提高采收率的方法。实验结果表明，富县页岩注 CO2置换法开采页岩气比直接降压开采的采收率提高了7．66％，地层压力衰竭到6.559 MPa 时，注 CO2效果最好，最佳的 CO2注入量为0．22倍的孔隙体积。注 CO2分子置换法开采页岩气是可行的，不仅能提高页岩气的采收率，而且可以缩短开采周期。
종 CO2치환혈암기흡부기개채궤리입수，통과혈암등온흡부、직접강압해석、주 CO2치환해석실험평개방법，탐토이용 CO2분자치환혈암기흡부기제고채수솔적방법。실험결과표명，부현혈암주 CO2치환법개채혈암기비직접강압개채적채수솔제고료7．66％，지층압력쇠갈도6.559 MPa 시，주 CO2효과최호，최가적 CO2주입량위0．22배적공극체적。주 CO2분자치환법개채혈암기시가행적，불부능제고혈암기적채수솔，이차가이축단개채주기。
This paper approaches a new method to promote the recovery by using CO2 to take the place of adsorption shale gas.The method proceeds from the perspective of exploitation mechanism of CO2 molecular replacement,by means of experiment evaluation methods of shale adsorption isotherms, direct depressurization and desorption,desorption by injecting CO2 replacement.The experiment results in labs of Fuxian suggest that the recovery by injecting CO2 increases by 7.66% and is higher than that by the way of direct depressurization and desorption.It is more suitable to inject CO2 when the reservoir pressure exhausts to 6.559 MPa,and the proper volume of the injecting CO2 is 0.22 times its pore volume.The CO2 molecular replacement method is feasible.It can improve the shale gas recovery and shorten the exploration cycle.