三相纳米泡沫起泡性能影响因素与封堵调剖效果
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国家科技重大专项“渤海双高油田多级窜逸堵调驱一体化技术研究及示范”(项目编号 2016ZX05058-003-010),国家自然基金项目“抗盐型聚合物油藏适应性及其改进方法基础研究”(项目编号 51574086)。


Foaming Performance Factors of Three Phase Nanometer Foam and Profile Control Effect
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    摘要:

    针对渤海油田开发现状和技术需求,为解决在泡沫调剖过程中泡沫稳定性差的问题,评价筛选出可大幅增强泡沫稳定性的 SiO2纳米颗粒并分析其稳泡机理,研究了起泡剂阴离子型表面活性剂 PO-FASD和 SiO2纳米颗粒加量、气体类型、环境压力对三相纳米泡沫体系起泡性能的影响,考察了三相纳米泡沫体系的封堵效果和液流转向能力。结果表明,SiO2纳米颗粒自身聚集性越好、粒径越小,对表面活性剂降低界面张力性能影响越小。相较于在二氧化碳和空气环境下,在氮气环境中泡沫的起泡性与稳定性最优。在 PO-FASD加量 0.5%、纳米颗粒(比表面积 350~ 410 m2/g)加量 0.3%和氮气条件下,三相纳米泡沫性能最佳。随环境压力升高,泡沫稳定性增强。三相纳米泡沫封堵性和调剖性良好,对均质岩心的封堵率为 99.3%;在非均质岩心中,可有效封堵高渗透层,低渗透层采收率增幅44.17%,整体采收率增幅达 16.06%,调剖堵水效果较好。图 8表 5参 30

    Abstract:

    Aiming at the development status and technical demand of Bohai oilfield and in order to solve the problem of poor foam stability in the process of foam profile control,SiO2 nanoparticles that could significantly enhance the foam stability were screened out and their foam stability mechanism was analyzed. The effects of anionic surfactant PO-FASD and SiO2 nanoparticles dosage,gas type and environmental pressure on the foaming performance of three phase nanometer foam system were studied. The plugging effect and flow diversion capability of three phase nanometer foam system were investigated. The results showed that the better self-aggregation of SiO2 nanoparticles and the smaller particle size,the smaller effect on the reduction of interfacial tension of surfactant was. Compared with carbon dioxide environment and air environment,the foam had better foaming ability and stability in nitrogen environment. Under the condition of 0.5% PO-FASD,0.3% nanoparticle(350—410 m2/g specific surface area)and nitrogen environment,the performance of three phase nanometer foam was the best. With the increase of environmental pressure,the foam stability increased. Three phase nanometer foam had good plugging and profile control properties and the plugging rate in homogeneous core was 99.3%. In heterogeneous core,the high permeability layer could be effectively blocked. The recovery rate of low permeability layer increased by 44.17% and the overall recovery rate increased by 16.06%,showing good profile control and water plugging effect.

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  • 在线发布日期: 2019-05-10
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