适用于高温高盐油藏控水的耐温耐盐堵剂

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

 杨建清¹ 李伟涛² 焦保雷¹ 方吉超² 何龙¹ 戴彩丽²

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 中国石油大学（华东）石油工程学院，山东 青岛 266555）

Petroleum Engineering Research Institute, Northwest Oilfield Company, SINOPEC, Urumqi 830011, China School of Petroleum Engineering, China University of Petroleum, Qingdao 266555, China)

 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HD & AME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。

 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.

10.6056/dkyqt201706030