页岩气多段压裂水平井渗流特征数值模拟研究  

Numerical simulation study on seepage characteristics of shale gas multi section fractured horizontal well

作　　者：郭艳东 胡小虎 王卫红[1,2] 刘华 Guo Yandong;Hu Xiaohu;Wang Weihong;Liu Hua(State Key Laboratory of Oil and Gas Enrichment Mechanism and Effective Development of Shale,Beijing 100083,China;China Petroleum Chemical Co Oil Exploration and Development Research Institute,Beijing 100083,China)

机构地区：[1]页岩油气富集机理与有效开发国家重点实验室,北京100083 [2]中国石油化工股份有限公司石油勘探开发研究院,北京100083

出　　处：《石化技术》2018年第3期153-156,130,共5页Petrochemical Industry Technology

基　　金：国家科技重大专项(2016ZX05060-002)

摘　　要：页岩气藏储层渗透率极低,需要经过体积压裂改造才能进行有效开发,页岩气多段压裂水平井的渗流特征非常复杂,准确认识页岩气井渗流特征是进行产能评价和试井分析的基础。目前对页岩气井渗流特征的认识还不够明确,而且大多是通过建立理论的解析渗流模型来研究的,解析模型的简化和求解对渗流特征研究影响较大。笔者建立了反映页岩气多段压裂水平井压裂缝网形态的数值模型,采用数值模拟方法结合实际气井分析,研究了页岩气井渗流特征。数值模拟研究表明:页岩气井在渗流过程中主要经历人工压裂裂缝线性流、地层和裂缝双线性流、地层线性流、过渡流、外围线性流和边界流六个渗流阶段,不同形态压裂缝网模型的渗流特征基本一致。实际页岩气井主要出现井储效应、地层和裂缝双线性流、地层线性流三个渗流阶段,很难出现裂缝线性流、外围线性流和边界流阶段。The permeability of shale gas reservoir is very low,so it needs to be reconstructed by volume fracturing to be effectively developed.The seepage characteristics of shale gas multi section fractured horizontal wells are very complicated.The accurate understanding of the seepage characteristics of shale gas wells is the basis for productivity evaluation and well test analysis.At present,the understanding of the seepage characteristics of shale gas wells is not clear,and most of it is studied through the establishment of theoretical analytical seepage model.The simplification and solution of the analytical model have a great influence on the study of the seepage characteristics.In this paper,a numerical model is established to reflect the fracture network of fractured horizontal wells in shale gas,and the numerical simulation method is combined with the actual gas well analysis.The seepage characteristics of shale gas wells are studied.Numerical simulation studies show that:In the process of seepage,shale gas wells mainly experience six seepage stages,including artificial fracturing,fracture linear flow,formation and fracture bilinear flow,stratiform linear flow,transitional flow,peripheral linear flow and boundary flow.The seepage characteristics of different fractured fracture network models are basically the same.The shale gas mainly reservoir effect,formation and fracture formation,linear bilinear flow three phase flow,It is difficult to appear the phase of the linear flow,the peripheral linear flow and the boundary flow.

关 键 词：页岩气井 渗流特征 数值模拟 井储效应 地层线性流 地层和裂缝双线性流 

分 类 号：TE312[石油与天然气工程—油气田开发工程]