三相泡沫调驱体系提高蒸汽驱采收率
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国家重点研发计划“稠油化学复合冷采基础研究与工业示范”(项目编号2018YFA0702400),山东省自然科学基金项目“纳米 颗粒稳定乳状液在油藏孔隙介质中形成条件及流度控制机理研究”(项目编号ZR2019MEE085)


Three-phase Foam Profile Control and Flooding System to Improve Steam Flooding Oil Recovery
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    摘要:

    为解决蒸汽驱过程中发生的蒸汽超覆和汽窜问题,以磺酸盐表面活性剂 ZAS、聚醚磺酸盐表面活性剂 ZCP-1和改性纳米硅颗粒NS复配研制了配方为0.5% ZAS/ZCP-1(复配比3∶1)+1.0% NS的三相泡沫调驱体系, 并通过实验评价该体系的泡沫性能、耐温性能、封堵性能和驱油性能。研究结果表明,该三相泡沫体系的泡沫性 能优异,常温下泡沫体积为680 mL、析液半衰期为26.67 min、泡沫半衰期为12 h,300 ℃热老化处理后性能稳定; 该三相泡沫体系在300 ℃高温条件下可以稳定存在且具有较好的封堵性能,能选择性封堵高渗透层,对不同渗 透率(1000×10-3~4000×10-3μm2)填砂管的阻力因子均大于30,阻力因子随着岩心渗透率的增加而增大。在渗透 率级差为1∶2的非均质条件下可有效改善吸汽剖面,大幅提高低渗模型采收率,综合采收率可提高17.93%,具有 良好的提高蒸汽驱采收率潜力。

    Abstract:

    To solve steam overriding and steam channeling in steam flooding, sulfonate surfactant ZAS, polyether sulfonate surfactant ZCP-1 and nanoparticle NS were compound to found a three-phase foam system with temperature resistance of 300 ℃ which formula was 0.5% ZAS/ZCP-1(mixed proportion was 3∶1)+1.0% NS. Then evaluated its foam performance, temperature resistance, plugging performance and oil displacement performance was evaluated through experiments. The results showed that the three-phase foam system had excellent foam performance at room temperature, the foam volume was 680 mL, the liquid half-life was 26.67 min, and the foam half-life was 12 h, and it was stable after heat aging at the temperature of 300 ℃. The three-phase foam system could stably exist at a high temperature condition of 300 °C and had blocking ability to selectively seal high permeability layers. Its resistance factor was greater than 30 within the permeability range of 1000×10-3—4000×10-3 μm2 , meantime, its blocking ability increased with the increase in permeability. Under the heterogeneous condition with a permeability difference of 1∶2, it could improve the total oil recovery by 17.93%, as a result of adjusting the steam absorption profile and increasing the oil recovery of the low-permeability model. The three-phase foam system has good potential to improve the oil recovery of steam flooding.

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  • 在线发布日期: 2022-04-25
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