可动微凝胶油藏适应性及调驱机制

针对深部调驱矿场实际需求，利用仪器检测和理论分析方法研究可动微凝胶（SMG）的渗透率极限、岩心孔喉与SMG粒径匹配关系、SMG注入、运移和封堵性能，通过微观驱油实验进步分析其调驱机制。结果表明：根据岩心渗透率极限与质量分数拟合的曲线方程可预测渗透率极限；SMG质量分数为1%前提下，当孔隙半径中值/颗粒半径大于2.65时，可满足SMG颗粒在油藏运移初步条件；SMG颗粒在微观上通过对孔喉进行堵塞-突破-再堵塞-再突破的过程，增加大尺寸孔隙喉道渗流阻力，促使注入水转向进入中小尺寸孔隙喉道，驱替其中剩余油，达到扩大波及体积效果。
According to the actual need of the deep profile controlling reservoir, the permeability limit of the soft microgel (SMG), matching relationship between its particles and core throat, the injection, migration and plugging performance have been studied, by means of apparatus detection and theoretical analysis. And the deep profile controlling was investigated further with the microscopic experiments. The results show that the permeability limitation can be predicted using the fitted curve equation between the core permeability limitation and mass fraction. When the mass fraction of SMG is 1% and the ratio of medium pore radius to particle radius is higher than 2.65, it meets the initial requirements of the reservoir transfer of SMG particles. From the microscopic level, it can be observed that the permeability resistance of big-size pore throats is increased through the blocking-breaking-blocking process of SMG particles flowing in the porous media. As a result, water can be diverted to the medium and small size pore throats and thus remaining oil can be replaced, which enlarges the sweeping volume