接枝淀粉聚合物调剖体系的封堵性能评价  

CORE PLUGGING PERFORMANCE TESTS FOR GRAFT STARCH POLYMER

作　　者：吴天江[1] 李华斌[1] 伊向艺[1] 张云善[2] 

机构地区：[1]油气藏地质及开发工程国家重点实验室.成都理工大学 [2]西南油气田分公司川西采输处

出　　处：《钻采工艺》2008年第5期121-124,173,共4页Drilling & Production Technology

摘　　要：开展室内岩心实验考察接枝淀粉聚合物调剖体系在孔隙介质中的封堵性能,结果表明:①接枝淀粉聚合物调剖体系成胶前具有一定的流度控制能力;成胶后残余阻力系数较大,具有降低大孔道渗透率的能力;②体系的残余阻力系数随注入速度的增加而减小;③体系对岩心具有很高的封堵率,当注入0.45PV时封堵率就可达到90%以上,注入量越大,封堵率越高;④体系具有较高的堵塞强度。注入后的突破压力梯度随流速的增加而增大;⑤体系的耐冲刷性好,经70PV注水冲刷后其封堵率仍保持在80%以上。油相驱替封堵率明显较低,最高只有39%,经70PV冲刷后已降至10%。接枝淀粉聚合物调剖体系具有堵水不堵油的特性。The sealing characteristics of graft starch polymer in porous medium were studied by core flooding tests.Results demonstrated that graft starch polymer profile control system could control fluidity before gel,because its residual resistance factor(RRF) was great after gel,it had the capacity of reducing perme-ability of high-capacity channel.RRF decreased with the in-crease of injection rate.The sealing rate was usually increased to 90% or more as the chemical slug size of 0.45PV was injected.The more quantity injected,the more sealing rate was.The system has higher bridging strength,the breakthrough pressure gradient increases with the increase of flow velocity.Moreover,the graft starch polymer profile control system has the characteristic of water plugging but oil phase.

关 键 词：接枝淀粉聚合物 调剖荆 残余阻力系数 封堵率 突破压力 耐冲刷性 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]