针对ANDES油田的抗高温高盐二元复合驱油体系研究

Study on Anti High Temperature and High Salinity Combinational Flooding for ANDES Oilfield

庄天琳 宋考平 赵宇 王纪伟 宋丽阳

ZHUANG Tianlin SONG Kaoping ZHAO Yu WANG Jiwei SONG Liyang

ANDES 油田属于高温（96℃）、高盐（71.5 g/L）油藏。在此条件下，将耐温耐盐理想的疏水缔合聚合物AP-P5 与4 种表面活性剂复配，发现0.3%的磺酸盐（MJ2）或大庆石油磺酸盐（DQ）与2500 mg/L AP-P5 形成的二元体系界面张力可以达到10-3mN/m数量级。考察了温度、矿化度对这两种二元复合体系黏度的影响。结果表明，两种二元复合体系黏度随着温度、矿化度的增加而降低。在96℃、矿化度为70 g/L 的条件下，3000 mg/LAP-P5+0.3% MJ2+稳定剂硫脲二元复合体系的黏度为99.4 mPa·s，达到现场要求。并且该二元体系在此条件下放置两个月后，黏度趋于稳定，界面张力波动幅度不大。室内物理模拟驱油实验中，当二元复合体系注入体积为0.65 PV时，采收率增幅最大（24.5%）。前期水驱至含水85%+0.65 PV（3000 mg/L AP-P5+0.3% MJ2）+后期水驱至出口含水98%为最佳驱油方案。图4 表3 参11

ANDES oilfield belonged to high temperature（96℃）and high salinity（71.5 g/L）reservoir. Under this condition，four kinds of surfactants were combined with an ideal AP-P5 polymer with a high temperature and high salinity resistant. It was found that the interfacial tension of binary combination system formed by 0.3% sulfonate（MJ2）or Daqing petroleum sulfonate（DQ）and 2500 mg/L AP-P5 could reach 10-3 mN/m magnitude. The effects of temperature and salinity on the viscosity of two kinds of binary combination system were examined. The results showed that the viscosity of two kinds of binary combination system decreased with increasing temperature and salinity. At 96℃ and salinity of 70 g/L，the viscosity of binary combination system with 3000 mg/L AP-P5，0.3% MJ2 and sulfocarbamide stabilizer was 99.4 mPa·s which satisfied the field requirement. And in this situation，the viscosity of this binary combination system tended to be stable after two months and there was small fluctuation of interfacial tension. During indoor physical simulation flooding experiment，the enhanced oil recovery rate reached the largest value（24.5%） when the injection volume of binary combination system was 0.65 PV. The displacement project of early water flooding（until 85% water content）+ 0.65 PV（3000 mg/L AP-P5 + 0.3% MJ2）+ late water flooding （until 98% water content） was the best oil displacement plan.