即时封堵防塌水基钻井液在四川页岩地层的应用  

Application of Instant Plugging Cave-in Prevention Drilling Fluid in Shale Drilling in Sichuan Province

作　　者：罗宇峰[1] 黄平[1] 李茂森[1] 葛炼[1] 万伟[1] 

机构地区：[1]川庆钻探工程有限公司钻井液技术服务公司

出　　处：《钻井液与完井液》2014年第5期28-31,97,共4页Drilling Fluid & Completion Fluid

摘　　要：针对四川盆地多个构造采用普通的水基钻井液体系斜穿页岩井段时遇到的井壁失稳难题,结合国内外对页岩理化性能的研究成果,在钾聚磺钻井液的基础上引入润湿反转技术、固相粒度分布调节技术、瞬时失水控制技术,形成一套具有即时封堵井壁孔隙、即时胶结近井壁带微裂缝、即时形成油润湿性致密滤饼特征的钻井液技术。该技术在公山庙、莲花山、张家坪等构造大斜度长页岩井段和破碎性垮塌井段进行了应用,取得了钻井周期节约33.5%,机械钻速提高29.4%,井径扩大率降低52.0%,划眼时率降低93.9%的良好效果,同时为使用水基钻井液钻页岩水平井提供了一定的技术积累和新的思路。When drilled deviated hole in shale formation in many geological structures in Sichuan with water base drilling fluids, borehole instability seemed inevitable. Effort has been made to solve this problem. When using polymer sulfonate drilling fluid to drill deviated hole through the shale formation, wettability reversal, solids particle size distribution control and spurt loss control technologies were combined to control formation instability. Using these technologies, the pores in the near-wellbore formation were instantly plugged, the micro-fractures in the near-wellbore formations were instantly sealed off, and a compact oil-wet mud cake was instantly generated against the newly formed borehole wall. This technology has been used in Gongshan Temple, Lianhua Hill and Zhangjiaping in the drilling of long deviated shale hole sections and fractured sloughing hole sections. Drilling time was saved by 33.5%, rate of penetration increased by 29.4%, rate of hole enlargement decreased by 52.0%, and time spend in reaming decreased by 93.9%.

关 键 词：水基防塌钻井液 页岩地层 井眼稳定 即时封堵 

分 类 号：TE254.3[石油与天然气工程—油气井工程]