低频水力振动在油层中的传播特性

Transmission characteristic of low frequency hydrodynamic oscillation in oil layers

为深入研究油层中低频水力振动传播机制和开发低频水力振动器,在考虑液?固耦合、脉动渗流等因素的基础上,建立了低频水力振动在油层中传播的数学模型,并在给出的初始、边界条件下,确定出小振幅水力振动在油层中一维及径向传播的解析解,分析了振动频率、油层渗透率、流体黏度对低频水力振动振幅衰减的影响规律,结果表明:在小振幅条件下,随着振动频率的增大、油层渗透率的减小、流体黏度的增大及振源振幅的减小,低频水力振动振幅的衰减速度和幅度不断增大;低频水力振动径向传播特性与一维传播特性相似,但径向传播振幅的衰减幅度比一维传播大.

In order to thoroughly investigate the transmission mechanism of low-frequency hydrodynamic oscillation and exploit low-frequency hydrodynamic oscillator,based on the consideration of the factors of oil-solid coupling, pulsatile seepage,we established a mathematical model of the transmission of low-frequency hydrodynamic oscillation,and,under the reasonable conditions of initialization and verge,working out the analytic solution of unidimensional and radial transmission of the small swing hydrodynamic oscillation,analyzing the influential law of the oscillation frequency,oil seepage rate,liquid viscosity upon the swing attenuation of low frequency hydrodynamic oscillation.The result indicates that under the condition of small swing,with the increase of the vibration frequency,the decrease of the oil seepage rate,the increase of the liquid viscosity and the decrease of the vibration source swing,the attenuation speed and scope of low-frequency hydrodynamic oscillate gradually increase;and radial transmission characteristic of low-frequency hydrodynamic oscillate is similar to that of one dimension transmission characteristic.But the attenuation scope of radical transmission swing is bigger than that of one dimension transmission.