高温高矿化度油藏深部调驱体系性能评价及应用

Performance Evaluation and Application of Deep Oil Displacement System in High Temperature and High Salinity Reservoir

钟万有 赵 波 韩世寰 贺承祖 余建波 李玉金 张文辉

ZHONG Wanyou，ZHAO Bo，HAN Shihuan，HE Chengzu，YU Jianbo，LI Yujin，ZHANG Wenhui

为满足青海、塔里木等特殊油藏的高温、高矿化度环境，用耐温耐盐聚合物SD6800、交联剂、改进剂和稳定剂制得适用于超高温、超高矿化度油藏的深部调驱剂，研究了调驱剂的耐温性、注入性、流动性、封堵性、耐冲刷性、驱油性能，并在塔里木油藏进行了矿场试验。研究结果表明，调驱剂最佳配方为：0.5%~2.0% SD6800、SD6800与交联剂质量比50∶1、0.2%改进剂、0.1%稳定剂。随着SD6800、交联剂或改进剂浓度增加，成胶速度加快，表观黏度增大，但交联剂或改进剂浓度过高，调驱剂易交联过度导致脱水；稳定剂可清除游离氧离子，提高调驱体系稳定性；温度升高，成胶速度递增，强度增强，但同时调驱剂的弹性和稳定性变差。调驱剂在150℃、矿化度 25×104mg/L 的条件下可长期稳定 60 d 以上。调驱剂具有良好的抗温耐盐性、流动性、封堵性能、耐冲刷性能。矿场应用结果表明，调驱体系可有效缓解油藏层内和层间矛盾，封堵高渗通道，改善油藏吸液剖面，提升井口压力，降低视吸水指数，增油降水效果明显。

In order to meet the high temperature and high salinity environment of special reservoirs，such as Qinghai and Tarim， deep oil displacement profile control agent was prepared using temperature and salt resistant polymer SD6800，cross-linking agent， improver and stabilizer. The temperature resistance，injection property，liquidity，plugging property，scour resistance and oil displacement performance of the oil displacement profile control agent were studied. Finally，field tests were conducted in Tarim oil reservoir. The research results showed that the optimum formula of the oil displacement profile control agent was obtained as follows：0.5%—2.0% SD6800，50∶1 mass ratio of SD6800 and crosslinker，0.2% improver，0.1% stabilizer. As the concentration of SD6800，cross-linking agent or improver increased，the gelation speed and the apparent viscosity increased. But if the concentration of cross-linking agent or improver was too high，the gelation was prone to cross-linking excessive and caused dehydration. The stabilizer could remove free oxygen ions and improve the stability of gel system. As the temperature increased，the gelation speed and the strength increased，but at the same time the elasticity and stability of the oil displacement profile control agent became worse. The oil displacement profile control agent could be stable for more than 60 days under the condition of 150℃ and 25×104mg/L salinity. The oil displacement profile control agent had good temperature and salt resistance，liquidity，plugging performance，and scour resistance. The field application results showed that the oil displacement profile control agent system could effectively alleviate intra- and inter-layer contradictions in the reservoir，block high-permeability channels，improve the liquid absorption profile of the reservoir，increase wellhead pressure and reduce apparent water absorption index. The effect of increasing oil and reducing water content was obvious.

10.19346/j.cnki.1000-4092.2020.01.006