花岗岩储层损害机理及保护技术研究  

THE DAMAGE MECHANISMS AND PROTECTION TECHNOLOGIES OF GRANITE RESERVOIRS

作　　者：赵峰[1] 唐洪明[1] 孟英峰[1] 李皋[1] 王自力[1] 

机构地区：[1]"油气藏地质及开发工程"国家重点实验室.西南石油大学,四川成都610500

出　　处：《西南石油大学学报（自然科学版）》2008年第3期76-80,共5页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：四川省教育厅青年基金项目(2006B061)

摘　　要：花岗岩储层由于岩性、物性、孔隙结构和敏感性矿物特征与常规储层有一定的差异,所以其损害机理也与常规储层不尽相同。本次研究利用扫描电镜、铸体薄片等手段,系统分析了花岗岩储层的损害机理,并对其有效的储层保护措施进行了探讨。研究结果表明:花岗岩储层主要的损害机理为固相侵入、应力敏感性损害和水锁损害,"五敏"损害中水/盐敏、碱敏损害较弱,主要为酸敏和速敏损害。研究认为欠平衡钻井技术是开发花岗岩储层的最佳选择,将欠平衡钻井与非直井工艺相结合可穿越储层中多条裂缝,获得更佳的产能;低压屏蔽暂堵技术虽然难以解决储层中宏观缝、大缝的封堵问题,但可以有效封堵储层中小于50μm的裂缝,使部分产能得到保护。There are some differences in characteristics of lithology,physical property,pore texture and sensitive minerals between granite reservoir and conventional reservoir,so the damage mechanisms of the granite reservoir are different from conventional reservoir.By utilizing such research methods as Scanning Electron Microscope,Cast Thin Section etc,the damage mechanisms of granite reservoirs are systematically analyzed,and the effective protection measures of granite reservoirs are explored.The study results indicate that the main damage mechanisms of granite reservoirs are solid invasion,stress sensitivity and water blocking;in'five types of sensitivity'damage,acid sensitivity and salt sensitivity are main damage types,the other sensitive damage are relatively weak.Combining the literature investigation with damage mechanisms study results,the under-balanced drilling technology is believed to be the best choice to exploit granite reservoirs,if the under-balanced drilling technology is integrated with non-straight well technology,the multiple fractures in granite reservoirs can be crossed,so the better productivity can be achieved.Low pressure bridge plug technology can not plug the macroscopic fractures and big size fractures,but the fractures those width is less than 50 microns can be effectively plugged and the part of productivity is protected.

关 键 词：花岗岩 储层 裂缝 损害 欠平衡钻井 屏蔽暂堵 

分 类 号：TE349[石油与天然气工程—油气田开发工程]