特低渗透砂岩微观模型水驱油实验影响驱油效率因素

MAIN CONTROLS FOR OIL DISPLACEMENT EFFICIENCY BY THE MICRO-MODEL WATER FLOODING EXPERIMENT IN ULTRA-LOW PERMEABILITY SANDSTONE RESERVOIR

通过鄂尔多斯盆地延长组特低渗透砂岩微观模型水驱油实验,探讨了驱油效率的控制因素。研究发现,特低渗透砂岩储层水驱油过程中,润湿性不同,驱替机理不同。水湿储层表现为驱替机理和剥蚀机理;油湿储层表现为驱替机理和油沿孔道壁流动机理。特低渗透砂岩储层水驱开发中影响开发效果的因素较多,其中包括物性、孔隙结构、注入量、注水速度、润湿性等。特低渗透砂岩储层水驱开发效果对注水速度较为敏感。针对不同的储层,采取合适的注水速度,才能取得较好的开发效果。

By the sandstone micro-model water flooding experiment of ultra-low permeability sandstone reservoir in the Ordos Basin,the controlling factors for oil displacement efficiency are studied in this paper.It＇s discovered that the wettability is different,so is the displacement mechanism.There are displacement and denudation mechanism in water wet reservoir,while there are displacement and flow mechanism in oil wet reservoir.There are many factors that affect the oil displacement efficiency such as the property,the pore structure,the injection volume,the injection rate,the wettability,and so on.The water drive development is sensitive to the injection speed in ultra-low permeability sandstone reservoir.For different reservoir,appropriate injection speed should be adopted in order to improve the effect of development.