文章摘要
清洁压裂返排液复配驱油体系的构建及性能评价
Construction and Performance Evaluation of Surfactant Flooding System Based on Clean FracturingFlowback Fluid
  
DOI:
中文关键词: 清洁压裂液返排液  再利用  体系复配  协同效应  性能评价  提高采收率
英文关键词: clean fracturing flow-back fluid  reutilization  compound system  synergistic interaction  performance evaluation  enhanced oil recovery
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作者单位
王 欢1,2, 由 庆 1,2, 韩 坤 3, 刘逸飞 4, 方吉超 4 1. 中国地质大学 (北京) 能源学院 北京 100083 2. 非常规天然气地质评价与开发工程北京市重点实验室 北京 100083 3. 中国石油长 庆油田公司第十二采油厂板桥采油作业区 甘肃 庆阳 745100 4. 中国石油大学 (华东)石油工程学院 山东 青岛 266580 
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中文摘要:
      针对现场压裂返排液中部分单一体系再利用效果不明显的问题, 通过考虑阴、 阳离子表面活性剂复配具有 协同效应的特点, 构建了一种基于清洁压裂液返排液的表面活性剂复配驱油体系, 通过分析体系降低界面张力 性能、 乳化性能, 优选了最佳的复配体系配方 0.2% RSH-2+0.012% AOS, 并评价了该复配驱油体系提高采收率效 果。结果表明, 纯返排液体系在质量分数 0.02%~0.5%范围内仅可将油水界面张力降低至 10-1 mN/m数量级, 而 0.2% RSH-2+0.012% AOS复配体系可降低油水界面张力至 10-3 mN/m超低数量级; 同时, 该复配体系乳化性能优 良, 油水比 1∶1的乳状液在静置 10 h后的析水率仅 30%。该复配体系在渗透率 0.0025 μm2的岩心中吸附性能优 良, 注入 124.5 PV时吸附达到动态饱和, 动态吸附量为 7.52 mg/g, 水驱后表面活性剂的滞留量只相当于动态饱和 吸附量的 1/4~ 1/3。该复配驱油体系具有较强的提高采收率能力, 在水驱基础上可提高采收率 11.8%, 能满足低 渗透油藏压裂后进一步提高采收率的要求。图 9参 25
英文摘要:
      Aiming at lower oil recovery increment of some clean fracturing flow-back fluid used in simple system, a method using the synergistic interaction between anionic and cationic surfactants was established to realize the reutilization of clean fracturing flow-back fluid in surfactant flooding, based on fundamental performance evaluation of flow-back fluid. The interfacial tension behavior, emulsification ability, adsorption behavior and enhanced oil recovery efficiency were studied systematically in laboratory. The results showed that the effective recipe of oil-displacing compound system was 0.2% RSH-2 + 0.012% AOS. The oi/water interfacial tension could only be lowered to 10-1 mN/m with single flow-back fluid, but could be further lowered to 10-3 mN/m through adding AOS with concentration 0.012%. The system had excellent emulsification performance, the water separation rate of the emulsion with oil-water ratio of 1∶1 was only 30% after 10 hours. Meanwhile, the dynamic retention amount was about one fourth to one third of the dynamic adsorption(about 7.52 mg/g) . The physical model experiments indicated that the oil recovery value could be enhanced 11.8% under optimal injection project, which confirmed its excellent performances on further enhanced oil recovery for low-permeability reservoirs after fracturing treatment.
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