摘要
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 0.40B-0.50B, the cross-linker HD 0.12B-0.20%, AME 0.12B-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 34.6B. 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.
作者
杨建清
李伟涛
焦保雷
方吉超
何龙
戴彩丽
YANG Jianqing;LI Weitao;JIAO Baolei;FANG Jichao;HE Long;DAI Caili(l.Petroleum Engineering Research Institute, Northwest Oilfield Company, SINOPEC, Urumqi 830011, China;School of Petroleum Engineering, China University of Petroleum, Qingdao 266555, China)
出处
《断块油气田》
CAS
北大核心
2017年第6期867-870,共4页
Fault-Block Oil & Gas Field
基金
国家科技重大专项专题“流道调整用剂与设计方法研究”(2016ZX05014-005-008)
国家杰出青年科学基金“提高采收率与油田化学”(51425406)
长江学者奖励计划(T2014152)
关键词
冻胶
高温高盐
选择性封堵
微观结构
交联机理
gel
high temperature and high salinity
selective plugging
microstructure
cross-linking mechanism
