基于边界元法的致密气藏多连通区域压裂水平井试井模型研究  

Study on Well Testing Model of Fracturing Horizontal Wells in Multi Connected Areas of Tight Gas Reservoirs based on Boundary Element Method

作　　者：赵玉龙[1,2] 冯颢严 崔乾晨 肖尧 李洪玺 侯晓犇 张烈辉 Zhao Yulong;Feng Haoyan;Cui Qianchen;Xiao Yao;Li Hongxi;Hou Xiaoben;Zhang Liehui(National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;School of Petroleum Engineering,Southwest Petroleum University,Chengdu 610500,China;Tight Oil and Gas Exploration and Development Project Department,Petro China Southwest Oil&Gas Field Company,Chengdu 610041,China;Geological Exploration&Development Research Institute,CNPC Chuanqing Drilling Engineering Co.Ltd.,Chengdu 610051,China;Third Gas Production Plant of Southwest Oil and Gas Company,China Petroleum and Chemical Co.,Ltd.,Deyang 618100,China)

机构地区：[1]西南石油大学油气藏地质及开发工程全国重点实验室,成都610500 [2]西南石油大学石油与天然气工程学院,成都610500 [3]中国石油天然气股份有限公司西南油气田分公司致密油气勘探开发项目部,成都610041 [4]中国石油川庆钻探工程有限公司地质勘探开发研究院,成都610051 [5]中国石油化工股份有限公司西南油气分公司采气三厂,德阳618100

出　　处：《水动力学研究与进展（A辑）》2024年第4期638-647,共10页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金资助项目(52222402,52234003,52074235);四川省杰出青年科技人才资助项目(2022JDJQ0009);中国石油-西南石油大学创新联合体项目(2020CX020202,2020CX030202)。

摘　　要：水平井分段多簇体积压裂是致密气藏高效开发的关键技术,试井分析是现场高效开展储层与裂缝参数反演的重要手段。由于致密气井钻遇储层物性非均质性强、力学性质差异大,常采用“一段一策”差异化压裂方案,导致传统线性耦合、统一SRV边界复合试井模型适用差,亟需解决试井模型考虑段间水力裂缝、SRV规模差异化精细表征的难题。鉴于单段SRV相对独立,该文的研究区域为一个多连通的渗流场,基于边界元理论联立耦合各渗流场边界积分,建立了包含多个渗流场的致密气井非稳态渗流模型,实现了压裂段间改造体积的独立刻画,并耦合了水力裂缝有限导流与应力敏感效应。综合应用Green函数、点源函数及摄动变换等方法实现模型求解,分析了单段SRV区域形态、规模及物性等参数对典型曲线的影响。研究成果以期为致密气藏水力裂缝、SRV物性参数反演及压后改造效果评估提供新方案。Segmented multi-cluster volume fracturing in horizontal wells is a key technology for the efficient exploitation of tight gas reservoirs,and well testing analysis is an important means to efficiently carry out reservoir and fracture parameter inversion in the field.Due to the strong heterogeneity of physical properties and large differences in mechanical properties of tight gas reservoir,the differentiated fracturing scheme of"one section and one policy"is often adopted,which leads to the poor application of the traditional linear coupling and unified SRV boundary composite well testing model,and it is urgent to solve the problem of considering the fine characterization of hydraulic fractures and SRV scale differences in the well testing model.In consideration of the relative independence of the single-segment SRV,a multi-connected seepage field is taken as the study area.Therefore,based on the boundary element theory,the boundary integral of each seepage field is coupled to establish an unsteady seepage model of tight gas wells with multiple seepage fields,which realizes the independent characterization of the SRV between fracturing sections,and couples the finite conductivity and stress-sensitive effects of hydraulic fractures.The Green function,point source function,perturbation transformation and other methods are used to solve the model,and the influence of parameters such as morphology,scale and physical properties of a single-segment SRV region on the typical curve is analyzed.The research results are expected to provide a new scheme for the inversion of hydraulic fractures and SRV physical parameters and the evaluation of reservoir modification effects in tight gas reservoirs.

关 键 词：边界元法 多连通区域 非稳态渗流 压裂水平井 试井分析 

分 类 号：TE348[石油与天然气工程—油气田开发工程]