巴什托背斜石炭系地层井壁失稳机理及控制技术  

Control Technology and Mechanism of Borehole Instability in Formation of Bashituo Anticline Carboniferous System

作　　者：陈涛[1] 乔东宇[1] 牛晓 郑义平[1] 

机构地区：[1]西部钻探克拉玛依钻井工艺研究院 [2]西北油田分公司工程技术研究院

出　　处：《钻井液与完井液》2011年第5期27-30,97,共4页Drilling Fluid & Completion Fluid

摘　　要：新疆巴楚地区巴什托背斜构造地层十分复杂,在钻进过程中喷、塌、卡、漏等复杂情况交互出现,其中石炭系地层井壁失稳表现尤为突出,且采用的高密度(1.90～2.15 g/cm3)钻井液体系维护难度大,更增加了井壁失稳的风险。从地质力学因素、物理化学因素2方面分析了石炭系地层井壁失稳的机理,选用了KCl/聚磺-聚合醇钻井液体系及相应的技术措施,使平均井径扩大率控制在2.55%左右,较好地满足了该地区井壁稳定的要求。The formation of Bashituo anticline is very complicated,the most difficult is borehole instability in Carboniferous system,and the mud density is up to 1.90-2.15 g/cm3,which leads more risk of borehole instability.This paper focuses on the mechanism of borehole instability,and analyses it from two aspects of geo-mechanics and physical chemistry.The KCI/polysulfonate-polyglycol drilling fluid system was applied successfully to control the enlargement within 2.55%.

关 键 词：石炭系 高密度钻井液 井壁失稳 地质力学 物理化学 巴什托背斜 

分 类 号：TE254.3[石油与天然气工程—油气井工程]