清洁压裂液破胶液驱油体系研究

发布时间：2019-02-15 12:29

【摘要】：针对压裂液返排液液量大、处理难度大、处理费用高及污染环境的问题,本文在考察粘弹性表面活性剂(VES)清洁压裂液破胶液基本性质的基础上,构建了一种可用于驱油的VES清洁压裂液破胶液驱油体系,实现了对清洁压裂液返排液的重复再利用。室内构建了基于VES清洁压裂液破胶液的驱油体系,体系配方为:0.1~0.4wt%破胶液+0.004~0.02wt%AOS。该体系在温度为61℃、矿化度为8.1×104mg/L条件下与安塞长6层脱水原油之间的界面张力为7.0×10-4mN/m,老化30天后界面张力仍能保持在10-3mN/m数量级,能够达到三次采油的标准。对构建的VES清洁压裂液破胶液驱油体系性能进行了系统评价,研究结果表明:该体系适用温度范围为50℃~90℃,适用矿化度范围为3×104mg/L~21×104mg/L,在温度为61℃、矿化度为8.1×104mg/L条件下该体系润湿性能优良,乳化性能较好,静砂表面的静态吸附量为30.25mg/g,动态饱和吸附量为静态的1/3,且水驱后动态滞留量仅相当于动态饱和吸附量的1/4~1/3。通过室内物理模拟实验显示,最优注入方案条件下实现采收率增值为12.5%,表明该体系在水驱后能够进一步提高采收率。采用岩心CT扫描、SEM电镜及微观仿真模型研究水驱后残余油分布、残余油的存在形式以及注入表面活性剂后残余油的启动和运移方式,直观地探究了表面活性剂的驱油机理。
[Abstract]:In view of the problems of large amount of fluid flowing back from fracturing fluid, great difficulty in treatment, high cost of treatment and pollution of environment, the basic properties of viscoelastic surfactant (VES) cleaning fracturing fluid are investigated in this paper. An oil displacement system of VES clean fracturing fluid was constructed, which can be used to drive oil. The reutilization of clean fracturing fluid was realized. An oil displacement system based on VES clean fracturing fluid was constructed in laboratory. The formula of the system is: 0.1 ~ 0.4wt% gel-breaking fluid 0.004 ~ 0.02wt AOS. The interfacial tension between the system and Ansai 6 layers of dehydrated crude oil is 7.0 脳 10 ~ (-4) mn / m under the condition of temperature 61 鈩，

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