微凝胶颗粒水分散液体系在多孔介质中的驱替机理

发布时间：2018-02-23 19:01

本文关键词： 柔性微凝胶多孔介质聚合物微球聚合物驱同步调驱提高采收率石油地质　出处：《地球科学》2017年08期 　论文类型：期刊论文

【摘要】：储层孔隙结构的非均质性导致水驱不均,不同大小孔隙(喉)之间形成优势渗流流动.在水驱开发中后期,剩余油高度分散在储层孔渗系统中难以启动,如何对孔隙尺度的水驱优势流动进行抑制的同时又确保不堵塞油流通道,使剩余油被高效采出,是当前提高石油采收率技术基础研究的主要方向.制作微观仿真储层孔隙结构与尺度的非均质性物理模型,开展了连续相驱替流体(聚合物溶液、交联聚合物凝胶)和微纳米柔性微凝胶颗粒水分散体系驱油机理的对比实验.实验表明,作为连续相的传统聚合物溶液依靠粘度无区分地增加大小孔隙中的流动阻力,从而赋予低渗层区小孔隙中的剩余油以驱动力,将这些剩余油携带采出,当粘度过大时,甚至难以启动剩余油;微凝胶颗粒分散液作为低粘水分散流体,其中的凝胶颗粒优先进入大孔隙,暂堵在喉道处并抑制相对大孔隙中的流动,同时注入水转向进入相对小的孔隙,将其中的剩余油活塞式推出,该过程在空间和时间上是不断重复的.本文从流度调整的角度对实验结果进行了分析,结果表明传统的连续相驱替流体是依靠提升注入水的粘度实现流度的调整,而微凝胶颗粒水分散体系是通过降低注入水的相对渗透率,并相对提高油相渗透率,从而实现对流度的高效调整.
[Abstract]:The heterogeneity of pore structure in reservoir leads to uneven water flooding and the formation of dominant percolation flow between pores (throats) of different sizes. In the middle and late stage of water flooding, it is difficult to start the remaining oil highly dispersed in the reservoir pore and permeability system. How to restrain the dominant flow of water flooding on pore scale while ensuring that the oil flow passage is not blocked, so that the remaining oil can be produced efficiently. At present, it is the main direction of basic research to improve oil recovery technology. A heterogeneous physical model of pore structure and scale of microsimulation reservoir has been developed and continuous phase displacement fluid (polymer solution) has been developed. The experimental results show that the conventional polymer solution as a continuous phase increases the flow resistance in pore size indiscriminately by viscosity. Thus, the remaining oil in the small pores in the low permeability zone is given driving force, and the remaining oil is carried out and produced. When the viscosity is too high, it is even difficult to start the remaining oil, and the microgel particle dispersion is used as the low viscosity water dispersion fluid. The gel particles first enter the macropores, temporarily block them in the throat and restrain the flow in the relative macropores, and at the same time, the injected water turns to the relatively small pores, and the remaining oil piston is pushed out. This process is repeated in space and time. This paper analyzes the experimental results from the point of view of mobility adjustment. The results show that the traditional continuous displacement fluids are adjusted by increasing the viscosity of injected water. The microgel particle water dispersion system can adjust the convection effectively by reducing the relative permeability of injected water and increasing the permeability of oil phase.
【作者单位】：中国石油勘探开发研究院;东北石油大学石油工程学院;中海油研究总院;
【基金】：国家科技重大专项(Nos.2008ZX05010,2011ZX05010)
【分类号】：TE357.6

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