多孔介质中弱凝胶运移封堵特征  

Migration-Plugging Properties of Weak Gel in Porous Media

作　　者：贺杰[1] 岳湘安[1] 丁名臣[2] 王业飞[2] 李立峰[3] 陈怡秀 

机构地区：[1]石油工程教育部重点实验室(中国石油大学(北京)),北京102249 [2]中国石油大学(华东)石油工程学院,山东青岛266580 [3]中国石化江苏油田分公司第一采油厂,江苏扬州225265 [4]陕西延长石油(集团)有限责任公司,陕西延安716000

出　　处：《油田化学》2015年第2期190-194,共5页Oilfield Chemistry

基　　金：973国家重点基础研究发展计划"CO2驱油中的渗流力学理论"(项目编号2011CB707305);长江学者和创新团队发展计划(项目编号IRT1294)

摘　　要：弱凝胶运移封堵能力的强弱是决定其能否实现深部调剖的关键因素之一。本文通过多测压点填砂模型中的封堵性能评价实验,研究了弱凝胶(酚醛交联部分水解聚丙烯酰胺体系)对高渗通道的运移封堵特征。结果表明,封堵能力较强体系应以残余阻力系数(Frr)为评价指标,封堵能力较弱体系应以渗透率封堵率(E)为评价指标。动态成胶状态对弱凝胶封堵能力影响较小,为了最大限度的实现深部调剖,凝胶溶液注入后可连续地进行后续注水而无需候凝。弱凝胶能通过自身运移对模型未注胶部位形成良好封堵。注胶深度为4.2 m、注入体积为2.0 PV时,其能在0数8.5 m形成较强封堵(E≥96.3%、Frr=27.0数385.7),在8.5数25.8 m形成部分封堵(3.0%≤E≤76.7%、Frr=1.0数4.3),在25.8数32.0 m则无封堵。与注胶部位相比,弱凝胶对未注胶部位的封堵能力显著降低。多孔介质的剪切作用导致弱凝胶黏度和粒度大幅减小,使其封堵能力随运移距离的增大而显著降低。The plugging capacity of weak gel during its flowing process was one of the most important factors affecting the realization of in-depth profile control. In this paper,a long sand-packed model was used to conduct the evaluation experiments of weak gel plugging capacity,and the migration-plugging property of a class of weak gel(phenolic crosslinking partially hydrolyzed polyacrylamide system)was studied. The results showed that the residual resistance factor(Frr)was the best index for the strong gel evaluation process,while permeability plugging rate(E)was the best choice for the weak gel. Dynamic gelation condition had little effect on the plugging capacity of weak gel. And to achieve the most in-depth profile control,the subsequent water flooding should be conducted continuously after the injection of gel solution rather than waiting for the gelation. By its flowing ability,weak gel could well plug the part without gel injection. When the gel injection depth was 4.2 m and the injection volume was 2.0 PV,the weak gel could strongly plug in 0—8.5 m section(E≥96.3%,Frr=27.0—385.7)and partially plug in 8.5—25.8 m section(3.0%≤E≤76.7%,Frr=1.0—4.3),and there was no plugging in 25.8—32.0 m section. Compared with the gel injection part,the plugging capacity of weak gel in the part without gel injection was much weaker. Shearing effect of porous media made the viscosity and particle size of weak gel decrease significantly,resulting in the obvious drop of its plugging capacity with increasing migration distance.

关 键 词：弱凝胶 动态成胶 运移封堵特征 残余阻力系数 渗透率封堵率 

分 类 号：TE39[石油与天然气工程—油气田开发工程]