油基钻井液用改性锂皂石增黏提切剂  

A Modified Hectorite Viscosifier and Gelling Agent for Oil Based Drilling Fluids

作　　者：倪晓骁 史赫 程荣超 张家旗 王建华 NI Xiaoxiao;SHI He;CHENG Rongchao;ZHANG Jiaqi;WANG Jianhua(CNPC Engineering Technology R&D Company Limited,Beijing 102200)

机构地区：[1]中国石油集团工程技术研究院有限公司,北京102200

出　　处：《钻井液与完井液》2022年第2期133-138,共6页Drilling Fluid & Completion Fluid

基　　金：中国石油天然气集团有限公司前瞻性基础性战略性技术攻关课题“高端钻完井处理剂和固井外加剂(超高温、极低温、纳米、超分子)研制”(2021DJ4401);中国石油天然气集团有限公司科学研究与技术开发课题“油田井筒工作液关键化学材料的开发与应用”(2020E-2803(JT))。

摘　　要：以正辛基三乙氧基硅烷和锂皂石为原料,利用溶胶-凝胶法一步合成了油基钻井液用增黏提切剂改性锂皂石MLap-1,分别利用红外光谱、热重分析、透射电镜和表面润湿性对其单体进行表征,证明其合成成功。通过对改性锂皂石MLap-1单剂评价发现,该剂能够提高油水比为80∶20乳液的乳化效率和破乳电压,在0.3%加量下,乳液破乳电压值达到1200 V以上,使得乳液的表观黏度和动切力由12 mPa·s和0 Pa增大至23 mPa·s和10 Pa,同时能够抗200℃高温。以改性锂皂石MLap-1为基础构建的高密度油基钻井液在200℃老化后,其动切力维持在4 Pa以上,低剪切速率切力维持在3 Pa以上,破乳电压高于1000 V,滤失量低于5.0 mL,很好地维护了钻井液的悬浮稳定性,保持了良好的乳化稳定性和降滤失效果。为油基钻井液进一步钻探深井、超深井提供了技术支持。A modified hectorite viscosifier and gelling agent,MLap-1,for oil based drilling fluids,has been developed through one-step sol-gel method using triethoxyoctylsilane and hectorite.Characterization of the product with IR spectroscopy,TGA,TEM and surface wettability has proved the success of the synthesis.Evaluation of MLap-1 showed that it can improve the emulsion efficiency and electric stability of 80∶20(O/W)emulsion;at 0.3%concentration of MLap-1 the electric stability of the emulsion was at least 1,200 V,and the apparent viscosity and yield point of the emulsion were increased from 12 mPa·s and 0 Pa to 23 mPa·s and 10 Pa,respectively.A high density oil based drilling fluid treated with MLap-1,after aging at 200℃,had its yield point maintained at above 4 Pa,low-shear-rate yield point above 3 Pa,electric stability above 1,000 V,and filtration rate less than 5.0 mL.These data indicate that MLap-1 is able to maintain the oil based drilling fluid in good suspension stability,good emulsion stability and good filtration control.The development of MLap-1 can be used to technically support the deep and ultra-deep drilling with oil based drilling fluids.

关 键 词：增黏提切剂 油基钻井液 悬浮稳定 高密度 

分 类 号：TE254.4[石油与天然气工程—油气井工程]