脉冲波作用下地层流体渗流规律研究

Study on the seepage law of formation fluid under the effect of pulse wave

通过对脉冲波作用下地层流体在地层中传播的动力学机理的研究,结合波动力学理论,建立了脉冲波作用下地层流体的渗流方程.假设脉冲波作用下地层流体速度是地层流体原来的流速与n次脉冲波作用下振动速度的叠加,得到了脉冲波作用下地层流体的流速方程.结合实例分析了距离、时间、脉冲频率和脉冲振幅对渗流速度的影响.随着距离增大,渗流速度的振幅逐渐减小,直至为零;随着频率的增大,渗流速度的振幅开始逐渐减小,而后又变大;随着脉冲振幅的增大,各点的流速振幅逐渐增大.建立波动条件下的渗流方程可以从理论上了解不同参数对渗流速度的影响,为脉冲波采油技术在现场的应用提供理论依据.

The seepage equation of formation fluid under the effect of pulse wave is established according to the dynamic mechanism of the pulse wave propagation in the formation and the wave mechanics theory.The flow velocity equation of formation fluid is obtained under the hypothesis that the flow velocity of formation fluid under the effect of pulse wave is the stack of the flow velocity of formation fluid without the effect of pulse wave with the vibration velocity of fluid particle under the effect of n-th pulse wave.The influences of the distance from pulse source,time,pulse frequency and pulse amplitude on the seepage velocity of formation fluid are analyzed by an example.It is shown that,the amplitude of the seepage velocity decreases with the increase of the distance;the amplitude of the seepage velocity decreases firstly and then increases with the increase of the pulse frequency;the amplitude of the seepage velocity increases with the increase of the amplitude.The research results can provide theoretical basis for the field application of pulse wave recovery technology.