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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 further study the transmission mechanism of low frequency hydraulic vibration in oil reservoir and develop low frequency hydraulic vibrator, the mathematical model of low frequency hydraulic vibration propagation in oil reservoir is established on the basis of factors such as fluid-solid coupling and pulsating seepage. Under the initial and boundary conditions, the analytical solutions of small-amplitude hydraulic vibrations in one-dimensional and radial directions in the reservoir are determined. The influence of vibration frequency, reservoir permeability and fluid viscosity on the amplitude attenuation of low-frequency hydraulic vibrations is analyzed. The results show that at With the increase of vibration frequency, the decrease of permeability, the increase of fluid viscosity and the decrease of amplitude of vibration source, the decay speed and amplitude of low frequency hydraulic vibration amplitude increase with small vibration amplitude. Propagation characteristics are similar to those of one-dimensional propagation, but the amplitudes of radial propagation are attenuated by more than one-dimensional propagation.