南堡3号构造深层脆性泥页岩井壁稳定机理分析与实践  

STUDY ON STABILITY MECHANISM OF BRITTLE SHALE BOREHOLE DEEP IN NANPU-Ⅲ STRUCTURE AND ITS APPLICATION

作　　者：朱宽亮[1] 陈金霞[1] 卢淑芹[1] 

机构地区：[1]中国石油冀东油田钻采工艺研究院

出　　处：《钻采工艺》2016年第5期1-4,100,共4页Drilling & Production Technology

基　　金：冀东油田重大项目"南堡深层岩性油气藏钻井关键技术研究";项目编号:2013A01-12

摘　　要：冀东油田南堡3号构造深层主要是指下第三系的东二段至沙河街的地层,该层段发育着大段的脆性泥页岩,因埋藏深、压实强度大、层理及微裂缝较发育,易塌易漏,井壁失稳严重。通过对泥页岩理化特性、宏观微观结构特征、力学特性、岩石力学与钻井液化学耦合作用与失稳机理的分析研究和钻井液体系的优化评价与应用,有效地解决了该泥页岩的井壁稳定问题,形成了一套适合于南堡3号构造深层脆性泥页岩井壁稳定钻井液技术,同时也为同类复杂岩性地层的安全钻井施工提供了技术借鉴作用。The deep zones at Nanpu-Ⅲ structure in Jidong oilfield range from Dong II to Shahejie group of Eogene system,wherein thick brittle shales are developed. The deep burial depth,high compaction strength,developed bedding and micro cracks resulted in well sloughing and circulation loss during well drilling,causing serious borehole instability problem. Based on the analysis and study of shale physicochemical properties,micro / macro-structure characteristics,rock mechanics,the chemical coupling effect of drilling fluid on shale,the borehole instability mechanism was investigated. Combined with the optimization and evaluation of the drilling fluid,the problems of borehole instability were solved. A set of borehole-stabilizing drilling fluid technology fit for deep brittle shales in Nanpu-Ⅲ structure is thus formed,which can act as reference for safe drilling in stratum with similar complex lithology.

关 键 词：冀东油田 深层 脆性泥页岩 井壁稳定 钻井液 

分 类 号：TE21[石油与天然气工程—油气井工程]