超声波提高特低渗储层水驱波及体积实验研究

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

华强

HUA Qiang

濮阳职业技术学院能源与化学工程学院，河南 濮阳 457000

School of Energy and Chemical Engineering, Puyang Vocational and Technical College, Puyang 457000, China

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10.5%~15.1%；超声作用可改变水分子的簇状结构，产生的小分子水可进入特低渗储层的小孔区域。另外，超声作用可降低水的黏度，提高水温，从而提高特低渗储层的水驱波及体积。研究结果有助于了解超声波提高特低渗储层水驱波及体积的作用机理，为该技术在油田现场的推广提供理论指导。

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.

10.6056/dkyqt202101021