大段盐膏层高密度盐水钻井液维护技术  

Maintenance Technology of High-density Brine Drilling Fluid in a Large Section of Salt-gypsum Formation

作　　者：李志勇 李春季 蓝强 崔永军 贺伦俊[3] 盖秀江 Li Zhiyong;Li Chunji;Lan Qiang;Cui Yongjun;He Lunjun;Gai Xiujiang(Drilling Technology Research Institute of Sinopec Shengli Petroleum Engineering Co.,Ltd,Dongying257000,China;Tarim Drilling Branch in Sinopec Shengli Petroleum Engineering Co.,Ltd.,Dongying257100,China;Sinopec Shengli Oilfield Branch Oil and Gas Exploration Management Center,Dongying257100,China)

机构地区：[1]中石化胜利石油工程有限公司钻井工艺研究院,山东东营257100 [2]中石化胜利石油工程有限公司塔里木钻井分公司,山东东营257100 [3]中国石化胜利油田分公司油气勘探管理中心,山东东营257100

出　　处：《山东化工》2020年第17期112-114,共3页Shandong Chemical Industry

基　　金：国家重大专项课题“低渗油气藏钻井液完井液及储层保护技术”(编号:2016ZX05021-004);“致密油气开发环境保护技术集成及关键装备”(编号:2016ZX05040-005);中石化集团公司重点攻关项目“新型高性能环保水基钻井液技术研究”(JP18038-12)部分研究内容。

摘　　要：针对大段盐膏层存在的井壁失稳、溶盐、钻井液污染等难题,常规高密度盐水钻井液往往出现固相含量高、固相容量限低、塑性黏度偏高等。为解决该难题,笔者在分析高密度盐水钻井液流变性影响要素的基础上,形成了一套盐膏层强抑制高密度钻井液体系,该体系流动性能良好,性能稳定,长时间高温不增稠。现场通过保持合理的膨润土含量、减少低密度固相含量、盐浓度控制、pH值控制和抑制降粘切等钻井液维护技术措施,将盐膏层钻井成功率提高至95%以上。In view of the problems of wellbore instability,salt dissolution,and drilling fluid pollution in large sections of salt-gypsum layers during the drilling,conventional high-density brine drilling fluids often have some drawbacks,including high solid phase content,low solid phase capacity limit,and high plastic viscosity.In order to solve this problem,based on the analysis of the factors affecting the rheology of high-density brine drilling fluid,the author forwarded a set of drilling fluid system with high-density and strong salt-gypsum layer suppression,which has good flow performance,stable performance,and no thickening.in high temperature for a long time.By adopting a set of drilling fluid maintenance technology for salt-gypsum formationwith proper MBT,colloid protection,control of inferior solid phase,equal concentration maintenance and suppression of viscosity/shear strength reduction by strong inhibition,the drilling success rate in salt gypsum layer is increased to more than 95%.

关 键 词：大段盐膏层 高密度盐水 高温稳定性 流变性 固含量 塑性粘度 

分 类 号：TE254.3[石油与天然气工程—油气井工程]