低渗透储层水平井伤害机理及保护技术  

Low Permeability Reservoir Horizontal Well Formation Damage Mechanism and Formation Protection

作　　者：李公让[1,2] 蓝强[2] 张敬辉[1,2] 李海斌[2] 杨景利[2] 

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266555 [2]中国石化胜利石油管理局钻井工艺研究院,山东东营257017

出　　处：《石油钻探技术》2010年第6期60-64,共5页Petroleum Drilling Techniques

基　　金：国家科技重大专项"低渗油气田高效开发钻井技术"课题四"低渗油气田储层保护技术"(2008ZX05022-004)部分研究成果

摘　　要：钻井过程中固相堵塞、液相引起的水锁、储层的敏感性、压差和浸泡时间都会对低渗透储层造成伤害,在此基础上提出了保护储层的3M原则:首先是最大化预防原则,采用全过程欠平衡钻井预防固相堵塞,尽量降低液相引起的自吸伤害;其次是最大化保护原则,在无法实现欠平衡钻井时,以近平衡钻井为主,采用无黏土防水锁钻井液;再次是最大化解除原则,在完井时采用环保生物完井液解除滤饼堵塞,同时减少压力激动,缩短作业时间。根据这些原则形成了以无黏土可降解钻井液、高效泡沫钻井液和高效解堵完井液为基础的低渗透水平井储层保护技术。在大牛地气田和胜利油田等17口低渗透储层水平井的应用表明,该储层保护技术油气层保护效果良好,能有效提高油气井产量,降低开发成本。After analysis,it shows that the main formation damage in low permeability reservoir is solid plugging,liquid phase trapping,formation sensibility,pressure difference and soaking time.The 3M principle of sequences was proposed.First,maximizing the precaution,the whole underbalanced drilling is used to avoid solid plugging,and the liquid sucking and trapping should be reduced as much as possible.Second,maximizing the protection,the near-balanced drilling circulating with non-clay anti-water-blocking drilling fluid is used to protect reservoir when UBD cannot be used.Third,maximizing the block-removing,fine completion coupling with environmental biological water-block removing fluid should be used to relieve the mud cake blocking,to relieve the pressure kicking and to shorten the operation time.According to these principles,the low permeability reservoir protection technology was developed with non-clay anti-water-blocking drilling fluid,high-efficiency foam drilling fluid and environmental biological water-block removing completion fluid.The applications in 17 wells in low permeability sandstone reservoir of Daniudi Gas Field and Shengli Oilfield showed that formation protection was achieved.It provided a useful technique for developing low permeability sandstone reservoir.

关 键 词：低渗透储集层 水平井 防止地层损害 钻井液 完井液 

分 类 号：TE258[石油与天然气工程—油气井工程]