自转向土酸在青海油田储层改造中的应用  

The Applications of Self-diverting Mud Acid during Reservior Stimulationin Qinghai Oilfield

作　　者：王浩儒[1] 王世彬[2] 郭建春[2] 

机构地区：[1]西南石油大学研究生部 [2]油气藏地质及开发工程国家重点实验室(西南石油大学),成都610500

出　　处：《科学技术与工程》2014年第15期177-180,共4页Science Technology and Engineering

基　　金：国家科技重大专项(2011ZX05045-03)资助

摘　　要：针对青海油田花土沟和尕斯区块储层多为薄互层,且层数多,跨度大,纵向非均质性严重,泥质含量较高等特征,为了消除储层突出的层间和层内矛盾,有效地改造油层,获得更好的产吸液剖面,通过室内实验形成并评价了以土酸为主体酸的自转向酸体系。该体系具有良好的增黏能力,能有效实现暂堵转向的目的,并且具有良好的耐高温流变性,与地层原油接触后能迅速破胶加快酸液返排。现场试验表明,土酸自转向酸酸化取得了明显的效果。Againstthe characteristics of reservoir in Huatugou Oilfield and Gasi Oilfield in Qinghai such as thin interbedded,multi-layered,large span,serious vertical heterogeneity,high clay content,a kind of viscoelastic surfactant self-diverting mud acid was developed and evaluatedthrough laboratory experiments in order to eliminate the outstanding contradictions within and between layers to stimulate effectively and get a better production andinjection profile. This acid system can viscosify well and achievetemporarily blockingeffectively duringacidification. In addition,this acid system has a goodrheologic behavior at high temperaturesand can degrade quickly when contacts with crude oil. Field tests showed that acidification used the self-diverting mud acid achieved remarkable effect.

关 键 词：自转向土酸 非均质性 暂堵转向 酸化 

分 类 号：TE357.2[石油与天然气工程—油气田开发工程]