致密碳酸盐岩储层损害特征及钻井液保护技术  

Characteristics of Tight Carbonate Reservoir Damage and Protection Technology of Drilling Fluid

作　　者：邓田青[1] 鄢捷年[2] 杨贵峰 叶艳[2] 魏红梅[1] 姚如钢[2] 

机构地区：[1]中海油田服务股份有限公司油田化学事业部钻完井液所 [2]中国石油大学(北京)石油工程教育部重点实验室 [3]中石化西南石油工程有限公司重庆钻井分公司

出　　处：《钻井液与完井液》2013年第4期25-28,93,共4页Drilling Fluid & Completion Fluid

基　　金：国家自然科学基金项目(50974129);国家科技重大专项(2009ZX05009-005)联合资助

摘　　要：致密碳酸盐岩储层孔喉细小,渗透性差,非均质性严重,微孔微裂缝较为发育,储层易发生应力敏感性损害和水锁损害。结合英买2油田致密碳酸盐岩油气藏特征,系统分析了低渗碳酸盐岩储层的损害特征。评价结果表明,该油田储层应力敏感损害率达82.9%、水锁损害率为72.53%～91.22%是该储层的主要损害类型。在该区原用聚磺钻井液基础上,通过优选高性能处理剂和可有效降低油/水界面张力的表面活性剂,应用理想充填技术,优化设计出了保护储层低损害钻井液;通过开展配伍性、动态污染等实验对该钻井液的储层保护特性进行了评价。实验结果表明,该钻井液具有良好的流变性与配伍性,天然岩心和不锈钢缝板岩心污染实验均表明,优化配方的渗透率恢复值均要高于现用配方,其储层保护效果显著。The tight carbonate reservoir is easy to be affected by stress sensitivity and water bblock damages because of the characteristics of tiny pores,low permeability,severe inhomogeneity and much micro-fracture and micro-pore.Based on the reservoir characteristics research of Yingmai2 oilfield,the experimental results show that the stress sensitivity damage(damage rate of 82.9%) and water block damage(damage rate of 72.53%-91.22%) are the main damages.With the normal used polysulfonate drilling fluid system,high performance agents and surfactant that reducing surface tension of oil/water are optimized,and ideal packing technology is applied to design a kind of low-damage drilling fluid system.The experimental results show that this drilling fluid system has good rheology and compatibility,and it can make the permeability recovery rate of cores increase from 60.1% to 86.3%.

关 键 词：致密碳酸盐岩储层 应力敏感损害 水锁损害 钻井液 防止地层损害 

分 类 号：TE258[石油与天然气工程—油气井工程]