CAJ | 학술논문

压裂井由于能够提高单井产量而在页岩气藏开发过程中得到了广泛的应用。在实际生产过程中，页岩气藏往往存在明显的应力敏感作用。为此，该文应用椭圆渗流的概念，综合考虑了页岩气解吸、扩散和渗流特征，建立了考虑应力敏感作用的页岩气藏双重孔隙介质垂直裂缝井椭圆流动渗流数学模型。考虑到模型非线性程度较高，重新定义部分参数，将解吸作用考虑成基质综合压缩系数的增加，并通过Laplace变换、摄动变换以及Duhamel原理，结合Stehfest数值反演技术对模型进行了求解，绘制了压力动态典型曲线，分析了应力模数、裂缝导流能力、Langmuir压力、Langmuir体积、窜流系数等参数对压力动态曲线的影响，其研究结果可为页岩气藏压力动态的合理分析提供科学依据。
압렬정유우능구제고단정산량이재혈암기장개발과정중득도료엄범적응용。재실제생산과정중，혈암기장왕왕존재명현적응력민감작용。위차，해문응용타원삼류적개념，종합고필료혈암기해흡、확산화삼류특정，건립료고필응력민감작용적혈암기장쌍중공극개질수직렬봉정타원류동삼류수학모형。고필도모형비선성정도교고，중신정의부분삼수，장해흡작용고필성기질종합압축계수적증가，병통과Laplace변환、섭동변환이급Duhamel원리，결합Stehfest수치반연기술대모형진행료구해，회제료압력동태전형곡선，분석료응력모수、렬봉도류능력、Langmuir압력、Langmuir체적、찬류계수등삼수대압력동태곡선적영향，기연구결과가위혈암기장압력동태적합리분석제공과학의거。
Fractured Wells has been widely used in the development of shale gas reservoir because of improving the single well production. In the process of practical production, shale gas reservoirs are usually stress-sensitive. Therefore, the concept of elliptical flow is applied in this paper, taking desorption, diffusion and percolation characteristics into account, and a mathematical model is established for finite conductivity vertical fractured well in double-porosity shale gas reservoirs with consideration of the stress sensitive effect and elliptic seepage. To decrease the degree of nonlinear,some new dimensionless variables have been defined. The effect of desorption has been considered as the increase of compressibility of matrix block in shale reservoir. By means of Laplace transform, perturbation transform and Duhamel principle, Stehfest numerical inversion technique is also used to solve the model. Pressure transient curves are drawn, and the influences of stress sensitivity, fracture conductivity, Langmuir pressure, Langmuir volume, interporosity flow coefficient and other relevant parameters on typical curve have been analyzed. The results obtained can provide scientific basis for reasonable analysis to pressure behavior of the shale gas reservoir.