水气分散体系提高采收率实验研究

本研究针对国内低渗及水驱后期高/特高含水油藏，研发了流度可调控的水气分散驱替体系，在测试了体系流动阻力和表观粘度的基础上，应用驱替实验评价了其驱替特征和驱油效率，进一步研究了水气分散体系提高原油采收率的能力。室内实验证明，通过调整水气比例和分散方式，体系的流动性能可随油藏开发的需要进行调控，并可在扩大波及体积的同时提高波及效率，可有效调控特低渗、低渗、中渗岩心流度比，扩大波及体积，大幅度提高水驱后的原油采收率。

Experimental Study of Enhance Oil Recovery by Water-Gas

This study aims at enhancing oil recovery of low permeable and high water-cut reservoirs in China. Water-gas dispersion system is invented and developed, and its displacement characteristics and capacity of EOR is evaluated by using core flooding experiments after the testing of its flow resistance and pseudo-viscosity. Laboratory experiments proved that by changing the water-gas ratio or dispersion pattern, the mobility of the water-gas dispersion system can be modified according to the needs of reservoir development, and sweep efficiency can be improved as well as displacement efficiency. Water-gas dispersion system can effectively modify the mobility ratio in low, ultra-low permeable reservoirs, and greatly improve oil recovery in high-water-cut reservoirs.