致密储层压裂液水锁损害定量评价模型及影响因素分析  

Quantitative Evaluation Model of Water Blocking Damage of Fracturing Fluid in Tight Reservoirs and Analysis of Affecting Factors

作　　者：潘泉羽 程林松[1,2] 贾品 胡江鹏[1,2] 贾志豪 PAN Quanyu;CHENG Linsong;JIA Pin;HU Jiangpeng;JIA Zhihao(College of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中国石油大学(北京)石油工程学院,北京102249 [2]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249

出　　处：《计算物理》2025年第2期192-201,共10页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(52004307,52174038);中国石油科技重大项目(ZLZX2020-02-04)资助。

摘　　要：为定量评价返排阶段致密储层的水锁损害程度,基于毛管力和相对渗透率随含水饱和度的变化关系,采用达西公式推导压裂液侵入区气水两相流动方程,建立致密储层返排阶段压裂液水锁损害定量评价模型。利用泰勒展开的非线性求解方法求解返排阶段侵入区含水饱和度、相对渗透率及渗透率损害率。分析压裂液侵入深度、压裂液黏度、排采压差、应力敏感对水锁损害的影响,并探索水锁损害对产水产气的影响。结果表明:当排采压差大于毛管力时,水锁损害开始逐步解除,并且排采压差越大,水锁解除程度越高,水锁损害程度越低。压裂液黏度、侵入深度、应力敏感系数较大时,返排阶段解除水锁难度较大,水锁损害程度较高,最终将导致气藏采收率降低。In order to quantitatively evaluate water blocking damage of tight reservoirs in flowback period,based on the relationship between capillary pressure and relative permeability with water saturation,Darcy's formula was used to characterize gas-water two-phase flow equations in invaded areas,and a quantitative evaluation model of water blocking damage of fracturing fluid in tight reservoir was established.The water saturation,relative permeability and permeability damage degree of invaded areas in flowback period were solved by the Taylor's nonlinear solution method,and the effect of fracturing fluid invasion depth,fracturing fluid viscosity,flowback and production differential pressure and pressure sensitivity were analyzed.The results show that,water blocking damage starts to gradually be relieved once the pressure differential of flowback and production exceeds the capillary force.The higher the differential pressure between flowback and production,the more effectively water blockage can be relieved and the less damage water blockage can cause.It is challenging to release the water blockage at the flowback period when the invasion depth,viscosity,and stress sensitivity coefficient of the fracturing fluid are high.The higher the damage degree of the water blockage,the lowertherecovery of gas will finallybe.

关 键 词：致密储层 水锁损害 毛管力 相对渗透率 

分 类 号：TE312[石油与天然气工程—油气田开发工程]