页岩气开采中的压力变化与气液传质规律  

PRESSURE CHANGE AND GAS-LIQUID MASS TRANSFER LAWS IN SHALE GAS EXTRACTION

作　　者：卢志炜 李熙喆 赵圣贤[4] 郝有志 LU Zhiwei;LI Xizhe;ZHAO Shengxian;HAO Youzhi(School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China;Institute of Porous Flow and Fluid Mechanics,Chinese Academy of Sciences,Langfang 065007,Hebei,China;Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;Shale Gas Institute,PetroChina Southwest Oil and Gasfield Company,Chengdu 610051,China;Department of Modern Mechanics,University of Science and Technology of China,Hefei 230027,China)

机构地区：[1]中国科学院大学工程科学学院,北京100049 [2]中国科学院渗流流体力学研究所,河北廊坊065007 [3]中国石油勘探开发研究院,北京100083 [4]中国石油西南油气田分公司页岩气研究院,成都610051 [5]中国科学技术大学近代力学系,合肥230027

出　　处：《力学与实践》2024年第5期1004-1014,共11页Mechanics in Engineering

基　　金：国家重大科技专项(2017ZX05009005-002)资助项目。

摘　　要：根据页岩气的赋存及流动机理,建立考虑页岩渗吸与吸附、渗流与扩散的流动方程,采用线段源叠加解等效为压裂产生的压力分布作为方程的初始条件,使用非结构PEBI(perpendicular bisection)网格对水平井多段压裂井进行网格划分,有限体积法进行离散。利用高频压力监测的闷井压力数据验证了算法程序的可靠性。研究得出以下结果:(1)发现页岩气开发的压力双漏斗及气液双向传质流动规律;(2)依据这一规律给出页岩气压最佳闷井时间和最优排采制度。Based on the occurrence and flow mechanism of shale gas,this article establishes a flow equation that considers shale infiltration and adsorption,as well as seepage and diffusion.The pressure distribution generated by fracturing is used as the initial condition of the equation using line source superposition solution.Unstructured perpendicular bisection(PEBI)grids are used to divide the multi-fractured horizontal wells,and the finite volume method is used for discretization.The reliability of the algorithm program was verified by using the shut-in pressure by high-frequency pressure monitoring.The study has drawn important conclusions:(1)discovering the double pressure funnel and gas-liquid two-way mass transfer laws in shale gas development;(2)Based on this theory,provide the optimal shut-in time and optimal drainage system for shale gas production.

关 键 词：页岩气排采 PEBI(perpendicular bisection)网格 压力双漏斗 气液双向传质 高频压力监测 

分 类 号：TE312[石油与天然气工程—油气田开发工程]