大功率超声波近井无机垢解堵的动力学机理

Kinetic mechanism of inorganic scale plugging removal at near wellbore zone by high power ultrasonic technology

利用超声波在含流体储层多孔介质中传播的固/液耦合波动力学理论,大功率超声波解除近井带地层堵塞过程中,超声波在近井储层多孔介质中传播引起岩石骨架弹性形变、孔隙流体与骨架固体弹性错流和孔隙弹性变形引起流体挤压喷射流动等微观动力学特性;超声波作用引起储层多孔介质孔隙半径蠕动变化的动力学特征;超声波作用解除储层多孔介质中无机垢颗粒微观动力学特征;分析了大功率超声波作用下,近井带储层多孔介质中声能聚集引起岩石局部起裂的动力学特征。在此基础上,提出了大功率超声波解除无机结垢堵塞的无机垢体破碎作用、超声空化作用、超声摩擦作用、超声蠕动输运作用以及超声造缝作用等微观动力学机理。

Based on the theory of solid and liquid coupling wave mechanics,the micro-dynamical characteristics caused by the transport of ultrasonic in porous media at near wellbore zone,including the elastic deformation of rock,the elastic crossflow of pore fluid and frame solid,and fluid squirt-flow produced by pore elastic deformation,are analyzed.Analysis of kinetics of peristaltic difference of porosity radius in porous media is presented.The characteristics of the removal of inorganic scale particle in porous media by using ultrasonic technology are also studied.Besides,by applying high power ultrasonic technology,the acoustic energy gathering in porous media at near wellbore zone leading to fracture of part rocks is illustrated.According to these analyses,the micro-dynamical mechanisms,such as inorganic scale fragmentation,ultrasonic cavitations,ultrasonic friction,ultrasonic peristaltic transport and ultrasonic fracture-making,occurred in inorganic scale plugging removal by high power ultrasonic technology are proposed.