低频谐振波作用下单相流体渗流模型研究

Reseach on Single-phase Fluid Mechanical Model under Low-frequency Vibration

大功率低频谐振波对低渗特低渗油藏开发效果的促进作用已初步得到矿场验证;但振动波对于油藏单相渗流的定量化影响机制尚不明确。基于此,通过开展谐振波对岩心渗透率影响实验,回归得出低频谐振波条件下渗透率表达式;进而在岩石渗透率与孔隙度关系模型及已有渗流模型基础上,建立了低频谐振波条件下单相流体渗流力学模型;并进行了程序编制与实例计算。结果表明在岩石固有频率时,低频振动使得振源处渗透率增加最大;随着离振源距离的增加,渗透率增值变小并呈指数衰减;但仍可大范围改善地层单相渗透率,提高油藏开发效果。研究成果对大功率人工谐振波技术在油藏开发中的应用具有一定支撑推动作用。

The promoting effect of high power lowfrequency resonant wave for low/extremely low permeability reservoir development has been verified initially. However quantitative impact mechanism of the vibration wave on singlephase flow is not clear. Based on this, through carrying out experiment on lowfrequency resonant wave for cores penetration effect, permeability formula under the condition of lowfrequency resonant wave can be obtained. Moreover, singlephase fluid mechanical model was established based on relationship between permeability and po rosity and previous model, then programming and example calculation were carried out. The results show that low frequency vibration makes permeability largest at local oscillator, with distance increasing from local oscillator, per meability declines exponentially, but it can still improve a wide range of singlephase permeability of the formation which improves the effect of reservoir development. This research plays a certain promoting role for the application of high power lowfrequency resonant wave technology in low/extremely low reservoir development.