超声波提高特低渗储层水驱波及体积实验研究

提高水驱波及体积是改善特低渗油藏开发效果的重要手段.利用低场核磁共振仪器、岩心驱替实验仪器和自主研制的超声发生仪,选取天然岩心开展岩心驱替实验,评价了渗流过程中超声作用对特低渗储层水驱波及体积的影响,探索了超声波提高特低渗储层水驱波及体积的作用机理.研究表明:超声作用可以在水驱基础上进一步提高特低渗储层的波及体积10....

Experimental study on ultrasound improving water-flooding swept volume of ultra-low permeability reservoir

Increasing the water-flooding swept volume is an important means to improve the development effect of ultra-low permeability reservoir.Using low field nuclear magnetic resonance instrument,core displacement experimental instrument and self-developed ultrasonic generator,the core displacement experiment was carried out in natural cores,and the influence of ultrasound on the water-flooding swept volume of ultra-low permeability reservoir was evaluated and the mechanism of ultrasonic wave to increase water-flooding swept volume of ultra-low permeability reservoir was discussed.The results show that ultrasonic action can further increase water-flooding swept volume of ultra-low permeability reservoir from 10.5%to 15.1%on the basis of water flooding.Ultrasonic action can change the cluster structure of water molecules,and the resulting small molecule water can enter the fine pore area of ultra-low permeability reservoir.In addition,the ultrasonic action can reduce the viscosity of water and increase the water temperature,and thus increase water-flooding swept volume of ultra-low permeability reservoir.The results are helpful to understand the mechanism of ultrasonic wave to increase water-flooding swept volume of ultra-low permeability reservoir and provide theoretical guidance for the popularization of this technology in oil field.