抗超高温高密度聚合物饱和盐水钻井液体系  

A high-temperature resistant and high-density polymeric saturated brine-based drilling fluid

作　　者：黄贤斌[1,2] 孙金声 吕开河[1,2] 董晓东 刘锋报[2,3] 高重阳 HUANG Xianbin;SUN Jinsheng;LYU Kaihe;DONG Xiaodong;LIU Fengbao;GAO Chongyang(MOE Key Laboratory of Unconventional Oil&Gas Development,China University of Petroleum(East China),Qingdao 266580,China;School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China;PetroChina Tarim Oilfield Company,Korla 841000,China)

机构地区：[1]中国石油大学(华东)非常规油气开发教育部重点实验室,山东青岛266580 [2]中国石油大学(华东)石油工程学院,山东青岛266580 [3]中国石油塔里木油田公司,新疆库尔勒841000

出　　处：《石油勘探与开发》2023年第5期1056-1064,共9页Petroleum Exploration and Development

基　　金：国家自然科学基金基础科学中心项目“超深特深层油气钻采流动调控”(52288101)。

摘　　要：设计并研制了3种聚合物类水基钻井液抗高温处理剂,即弱交联结构两性离子聚合物降滤失剂、柔性聚合物微球纳米封堵剂和梳型聚合物润滑剂,构建了能够满足深部地层钻井的抗超高温高密度聚合物饱和盐水钻井液体系。研究表明:弱交联结构两性离子聚合物降滤失剂具有良好的反聚电解质效应,200℃、饱和盐环境老化后API滤失量小于8 mL;柔性聚合物微球纳米封堵剂通过改善泥饼质量降低体系的滤失量,对纳米级孔缝具有良好的封堵效果;梳型聚合物润滑剂重均相对分子质量为4804,具有多个极性吸附位点,高温高盐条件下润滑性能优异。构建的密度为2.0 g/cm^(3)的钻井液体系流变性能良好,200℃的高温高压滤失量小于15 mL,高温静置5 d沉降因子小于0.52,对易水化岩屑的滚动回收率与油基钻井液接近,具有良好的封堵性能和润滑性能。Three high-temperature resistant polymeric additives for water-based drilling fluids are designed and developed:weakly cross-linked zwitterionic polymer fluid loss reducer(WCZ),flexible polymer microsphere nano-plugging agent(FPM)and comb-structure polymeric lubricant(CSP).A high-temperature resistant and high-density polymeric saturated brine-based drilling fluid was developed for deep drilling.The WCZ has a good anti-polyelectrolyte effect and exhibits the API fluid loss less than 8 mL after aging in saturated salt environment at 200℃.The FPM can reduce the fluid loss by improving the quality of the mud cake and has a good plugging effect on nano-scale pores/fractures.The CSP,with a weight average molecular weight of 4804,has multiple polar adsorption sites and exhibits excellent lubricating performance under high temperature and high salt conditions.The developed drilling fluid system with a density of 2.0 g/cm^(3)has good rheological properties.It shows a fluid loss less than 15 mL at 200℃and high pressure,a sedimentation factor(SF)smaller than 0.52 after standing at high temperature for 5 d,and a rolling recovery of hydratable drill cuttings similar to oil-based drilling fluid.Besides,it has good plugging and lubricating performance.

关 键 词：深层钻井 饱和盐水钻井液 抗高温处理剂 水基钻井液 流变性能 封堵性能 润滑性能 

分 类 号：TE254[石油与天然气工程—油气井工程]