适用于高温高盐油藏控水的耐温耐盐堵剂

针对常规堵剂耐温耐盐性能差,而难以满足高温高盐油藏控水进一步提高采收率的问题,研发了一种耐温耐盐(97℃,197.35 g/L)的延缓冻胶体系。该体系由耐温耐盐非离子聚丙烯酰胺PAM、有机交联剂HDAME组成,目标油藏条件下,优化的冻胶体系配方为(0.40%~0.50%)PAM+(0.12%~0.20%)HD+(0.12%~0.20%)AME,成胶时间在24~60 h。室内物理模拟实验表明,耐温耐盐延缓冻胶体系具有较好的剖面改善能力,采收率增值达到34.6百分点。采用环境扫描电镜(ESEM)和差示扫描量热仪(DSC)探究了冻胶的微观结构和耐温耐盐性能,并从冻胶的交联机理、微观结构阐明了其耐温耐盐特性。

Temperature and salinity tolerant gel for water control in high temperature and high salinity reservoir

In view of the poor temperature and salinity tolerant performance of conventional plugging agent,it is difficult for them to control water to enhance oil recovery in high temperature and high salinity reservoir.In this paper,the gel (97 ℃,197.35 g/L),composed of nonionic polymer PAM,organic cross-linker HD & AME,has been screened to plug high permeability zone and enhance oil recovery.The effects of the polymer concentration and cross-linker concentration on gelling property were evaluated,which optimized the formula of gel system.The experiment results show that the mass fraction of polymer PAM is 0.40％-0.50％,the cross-linker HD 0.12％-0.20％,AME 0.12％-0.20％,and gelation time adjustable from 24 to 60 hours.In addition,the core flooding experiments show that the gel has good selective plugging capacity and the incremental value of enhancing oil recovery is 34.6％.Finally,by environment scanning electron microscope (ESEM) and differential scanning calorimetry (DSC),the structure and properties of polymer gel were analyzed.Moreover,the cross-linking reaction process was listed to study the temperature and salinity tolerant mechanism of the gel.