可降解微交联减阻剂的开发及应用  

Development and application of degradable micro-crosslinked drag reducer

作　　者：吴越 WU Yue(Sichuan Chuanqing Downhole Science&Technology Co.,Ltd.,Guanghan 618300,China)

机构地区：[1]四川川庆井下科技有限公司,四川广汉618300

出　　处：《石油化工》2023年第5期708-713,共6页Petrochemical Technology

摘　　要：针对常规线型减阻剂配制中高黏滑溜水时增黏能力弱、使用量偏高的问题,在线型减阻剂分子结构中引入了含丙烯酸酯键的交联结构,开发了可降解微交联减阻剂。实验结果表明,该微交联减阻剂能在30~40 s溶解,减阻率可达70%以上;微交联减阻剂增黏能力较线型减阻剂更强,但添加量超过0.4%(w)后,滑溜水黏度增加趋势变缓;黏度要求10~30 mPa·s时,微交联减阻剂比线型减阻剂的加量(w)下降20%~30%;相比线型减阻剂,微交联减阻剂配制的滑溜水有更高的屈服强度、更长的松弛时间以及更高的弹性模量与黏性模量比值,表明微交联减阻剂配制的滑溜水中弹性特征占比更高;微交联减阻剂配制的滑溜水动态支撑剂运移距离更远、铺砂剖面更好;微交联减阻剂在地层水中能够发生降解,90℃下48 h后滑溜水黏度下降率超过80%;微交联减阻剂现场应用效果良好,相比常规减阻剂用量下降20%以上。Aiming at the problems of poor thickening ability and high usage of conventional linear drag reducers in the preparation of middle-high viscosity slickwater,novel degradable micro-crosslinked drag reducers were developed by introducing crosslinker structure containing acrylate bond into the linear drag reducers.The experimental results show that crosslinked drag reducers can be dissolved in 30-40 s,and their drag reduction rate can reach over 70%.The thickening ability of crosslinked drag reducers is stronger than that of linear ones,but when the addition is over 0.4%(w),the increasing trend of slickwater viscosity becomes slower.When the slickwater viscosity is required to be 10-30 mPa·s,the adiition of the crosslinked drag reducers can decrease by 20%-30%(w)compared with that of linear ones.The slickwater prepared by the crosslinked drag reducers demonstrates higher yield strength,longer relaxation time and higher ratio of elastic modulus to viscous modulus than by linear ones,indicating higher proportion of elastic characteristics of the slickwater.Slippery water prepared with micro crosslinked drag reducers has a longer dynamic migration distance of proppant and better sand profile.The crosslinked drag reducers can be degraded in formation water,and the viscosity reduction rate of slickwater exceeded 80%after 48 h at 90℃.The application effect of the crosslinked drag reducers is remarkable,and their amount is more than 20%lower than that of conventional drag reducers.

关 键 词：减阻剂 微交联 可降解 中高黏滑溜水 

分 类 号：TE357.12[石油与天然气工程—油气田开发工程]