160℃无固相氯化钙冲洗隔离液体系的构建  

Construction of 160℃ Solid-free Calcium Chloride Flushing Spacer Fluid

作　　者：潘丽娟[1,2] 方俊伟[1,2] 邓小刚[3] 石鑫[1,2] 胡广强[1,2] 胡正文[3] 林凌[3] 王静 PAN Lijuan;FANG Junwei;DENG Xiaogang;SHI Xin;HU Guangqiang;HU Zhengwen;LIN Ling;WANG Jing(Research Institute of Petroleum Engineering,Northwest Oilfield Branch Company,Sinopec,Urumqi,Xinjiang 830011,P R of China;Key Laboratory for Enhanced Oil Recovery in Fractured and Vuggy Reservoirs,Sinopec Urumqi,Xinjiang 830011,P R of China;School of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu,Sichuan 610500,P R of China)

机构地区：[1]中国石化西北油田分公司石油工程技术研究院,新疆乌鲁木齐830011 [2]中国石化缝洞型油藏提高采收率重点实验室,新疆乌鲁木齐830011 [3]西南石油大学化学化工学院,四川成都610500

出　　处：《油田化学》2023年第2期205-210,共6页Oilfield Chemistry

基　　金：中国石化科技重大专项“顺北一区5号断裂带提质提速钻完井技术研究”(项目编号P20002);中国石化“十条龙”科技攻关“顺北油田勘探开发关键技术攻关及应用”。

摘　　要：传统隔离液存在抗温、抗钙能力不足,对油基钻井液体系顶替不充分和冲洗效率低等问题。通过采用非离子型抗温抗盐聚合物羟乙基纤维素(HEC)提高隔离液体系流变性能,复配表面活性剂提高清洗效率,制备了一种无固相抗温抗钙高效冲洗隔离液。对隔离液体系进行抗温性能、流变性能、配伍性能和冲洗效率评价及性能优化,确定隔离液体系配方为0.5%HEC+30%氯化钙+2%甲酸钠+0.4%快T。研究结果表明,无固相隔离液体系的密度为1.3 g/cm3,160℃老化6 h后隔离液的表观黏度大于35 mPa·s,塑性黏度大于25 mPa·s,动切力大于10 Pa,冲洗效率大于95%,与油基钻井液和氯化钙完井液均具有良好的相容性。The traditional spacer fluid has some problems such as insufficient ability of temperature resistance,calcium resistance,inadequate displacement to oil-based drilling fluid and low flushing efficiency.A solid-free,temperature-resistant and calcium-resistant high-efficiency flushing spacer fluid was prepared by using a temperature-resistant and salt-resistant polymer(HEC)to improve the rheological properties of the flushing spacer fluid,and mixing surfactant to improve the flushing efficiency.The temperature resistance,rheological properties,compatibility and flushing efficiency of the spacer liquid was evaluated and optimized.The optimal recipe of the spacer fluid was as follows,0.5% HEC+30% calcium chloride+2% sodium formate+0.4% sodium 2-ethylhexyl sulfate,and the density was of 1.3 g/cm^(3).The apparent viscosity of the spacer fluid was higher than 35 mPa·s,the plastic viscosity of the spacer fluid was higher than 25 mPa·s,and the dynamic shear force was greater than 10 Pa and the flushing efficiency was greater than 95% after aging at the temperature of 160℃ for 6 h.Moreover,the spacer fluid had good compatibility with oil-based drilling fluid and calcium chloride completion fluid.

关 键 词：隔离液 无固相 抗钙 抗温 冲洗效率 

分 类 号：TE257[石油与天然气工程—油气井工程]