考虑应力敏感和复杂运移的页岩气藏压力动态分析

doi:10.12108/yxyqc.20190416

岩性油气藏 ›› 2019, Vol. 31 ›› Issue (4): 149–156.doi: 10.12108/yxyqc.20190416

考虑应力敏感和复杂运移的页岩气藏压力动态分析

姜瑞忠¹, 张福蕾¹, 崔永正¹, 潘红², 张旭¹, 张春光¹, 沈泽阳¹

1. 中国石油大学(华东)石油工程学院, 山东青岛 266580;
2. 中国石油大港油田分公司采油工艺研究院, 天津 300280

收稿日期:2018-11-12 修回日期:2019-02-06 出版日期:2019-07-21 发布日期:2019-06-21
第一作者:姜瑞忠(1964-),男,博士,教授,博士生导师,主要从事油气田开发方面的教学与研究工作。地址:(266580)山东省青岛市黄岛区长江西路66号中国石油大学(华东)。Email:19870005@upc.edu.cn。
基金资助:
国家自然科学基金项目"致密储层体积压裂缝网扩展模拟研究"（编号：51574265）、国家重大科技专项"厚层非均质气藏产能评价及预测技术"（编号：2016ZX05027004-004）和"低渗、特低渗油藏水驱扩大波及体积方法与关键技术"（编号：2017ZX05013-002）联合资助

Pressure dynamic analysis of shale gas reservoirs considering stress sensitivity and complex migration

JIANG Ruizhong¹, ZHANG Fulei¹, CUI Yongzheng¹, PAN Hong², ZHANG Xu¹, ZHANG Chunguang¹, SHEN Zeyang¹

1. School of Petroleum Engineering, China University of Petroleum(East China), Qingdao 266580, Shandong, China;
2. Research Institute of Oil Production Technology, PetroChina Dagang Oilfield Company, Tianjin 300280, China

Received:2018-11-12 Revised:2019-02-06 Online:2019-07-21 Published:2019-06-21

摘要/Abstract

摘要： 页岩气藏渗透率极低，储层存在很强的应力敏感性，所以需对其进行水力压裂。通过分析吸附解吸、Knudsen扩散、非稳态窜流和渗流等多种气体运移机制来建立页岩气藏复合模型，采用Mathieu函数、Pedrosa变量代换、正则摄动理论、拉普拉斯变换和Stehfest数值反演等方法来求解数学模型，并绘制出无因次拟压力曲线，同时对渗透率模量、SRV半径、外区裂缝渗透率、扩散系数和解吸压缩系数等相关参数进行敏感性分析。结果显示：气体流动阶段可划分为9段，渗透率模量的增加导致气井定产量生产时所需压差增大，而SRV半径和解吸压缩系数的增大使得压差减小；较大的外区裂缝渗透率与较小的流度比相对应，扩散系数越大，页岩基质表观渗透率越大，窜流发生的越早。提出的试井模型可提高页岩气藏压力动态分析的准确性，对压裂开发页岩气藏具有一定的理论指导意义。

关键词: 页岩气, 复合模型, 压力, 应力敏感, 椭圆SRV, 压裂井

Abstract: The permeability of shale gas reservoirs is extremely low,and the formation is stress-sensitive strongly. The hydraulic fracturing is one of the effective exploitation methods. A composite shale gas reservoir model was established by introducing some gas migration mechanisms,such as shale gas adsorption and desorption,Knudsen diffusion,unsteady cross flow and seepage. Mathieu function,Pedrosa variable substitution,regular perturbation theory,Laplace transform and Stehfest numerical inversion methods were used to solve the mathematical model,and then the typical curves of dimensionless pseudo-pressure were plotted. The sensitivity analyses were conducted on the relevant parameters,such as permeability modulus,SRV radius,outer region fracture permeability,diffusion coefficient and desorption compressibility. The results show that the gas flow can be divided into nine stages. A larger permeability modulus resulted in a larger pressure difference required for gas well constant production. The larger the SRV radius and the desorption compressibility are,the smaller the pressure difference is. The larger fracture permeability in outer zone corresponds to a smaller mobility ratio. The larger the diffusion coefficient is,the larger the apparent permeability of the shale matrix is,and the earlier the cross flow occurs. The proposed well test model can improve the accuracy of pressure dynamic analysis of shale gas reservoirs and has certain theoretical guiding significance for fracturing development of shale gas reservoirs.

Key words: shale gas, composite model, pressure, stress sensitivity, elliptical SRV, fractured well

中图分类号:

TE348

姜瑞忠, 张福蕾, 崔永正, 潘红, 张旭, 张春光, 沈泽阳. 考虑应力敏感和复杂运移的页岩气藏压力动态分析[J]. 岩性油气藏, 2019, 31(4): 149–156.

JIANG Ruizhong, ZHANG Fulei, CUI Yongzheng, PAN Hong, ZHANG Xu, ZHANG Chunguang, SHEN Zeyang. Pressure dynamic analysis of shale gas reservoirs considering stress sensitivity and complex migration[J]. Lithologic Reservoirs, 2019, 31(4): 149–156.

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考虑应力敏感和复杂运移的页岩气藏压力动态分析

Pressure dynamic analysis of shale gas reservoirs considering stress sensitivity and complex migration

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