大牛地气田保护储层钻井完井液技术研究  

Drill-in Fluid Technology for Reservoir Protection in Daniudi Gas Field

作　　者：薛玉志[1] 刘宝锋[1] 李公让[1] 张敬辉[1] 李海滨[1] 郑成胜[1] 

机构地区：[1]胜利石油管理局钻井工艺研究院

出　　处：《钻井液与完井液》2009年第3期5-8,共4页Drilling Fluid & Completion Fluid

基　　金：国家科技重大专项"低渗油气田高效开发钻井技术"子课题四"低渗油气田储层保护技术"(2008ZX05022-04)部分研究内容

摘　　要：大牛地气田储层属于低孔低渗储藏,介绍了其地质特征,分析了其储层伤害因素。结合现场施工工艺,研究制定了一套适合大牛地气田的保护储层钻井完井液技术,包括无固相钻井液技术、钻井完井液防水锁技术、用空心玻璃微珠作密度减轻剂实现的近平衡或欠平衡钻井技术、用甲酸钾提高钻井液抗温性的技术、滤饼可自动清除的生物酶完井液技术。在大牛地气田的DF2、DP4、DP5、DP6和DP11井水平段的施工结果表明,无固相钻井液具有较高的机械钻速,配合使用防水锁剂,能够有效地解决储层水相圈闭损害严重的问题,可完全满足大牛地气田低压低渗储层开发;生物酶完井液完全满足大牛地低压低渗储层水平井裸眼完井的需要,可快速分解无固相钻井液泥饼,使储层渗透率快速恢复至85%以上,该技术可以进行推广应用。A set of drill-in fluid technology was reservoir protection,such as solids-free drilling fluid,water block prevention,near or under-balance drilling using hollow glass beads as light weight additive,drilling fluid high temperature stability achieved by using potassium formate,as well as mud cake automatic removal by biological enzymes,was designed for the development of the low porosity,low permeability gas field of Daniudi.These techniques have been applied in the horizontal sections of wells DF2,DF4,DF5,DF6 and DP11.Permeability recovery achieved using these technologies was as high as 85% and above,according to filed application records.

关 键 词：低密度无固相钻井液 生物酶完井液 防止地层损害 水锁 甲酸钾 低孔低渗储藏 大牛地气田 

分 类 号：TE254.3[石油与天然气工程—油气井工程]