气水交替注入技术不仅能提高注气驱过程的体积波及系数,还能改善高流度气体在流经低流度油藏流体时的流动效率,但是与连续注气或注水相比,气水交替驱注入能力发生异常的可能性明显增加.通过长岩芯驱替实验,研究了低渗油藏水驱后进行气水交替驱(气水比为1:1,1:2,2:1)时注入能力的变化.实验结果表明:气水交替驱会出现注入能力下降的问题,但当交替注入一定量后,注入能力不会持续下降,而是维持在一定水平；同时增大气段塞可以降低注入压力,增大注入能力,但对采收率有负面影响.%The water and gas alternate injection technology can not only increase the volume wave and coefficient of the gas displacement, but also improve the flow efficiency of high fluidity gas when flowing through low fluidity reservoir fluid flow. Compared with continuous gas or water injection, the possibility of abnormality for the injection capability of gas and water alternate drive is increasing obviously. Based on the indoor long core displacement experiment, we studies the changes in the injection capability at the time of water and gas alternate drive (Gas/water ratios are 1/1, 1/2 and 2/1, respectively) after water drive at low permeability oil reservoir. The results show that the injection capability tends to decrease after gas and water alternate drive. After a certain amount has been injected through alternative injection, the injection capability will not keep decreasing and maintain at a certain level. Meanwhile, the injection pressure can be decreased and the injection capability can be increased by enlarging the gas slug, but the recovery ratio will be influenced negatively.
展开▼
