缝洞型碳酸盐岩油藏流动机理初探

缝洞型碳酸盐岩油藏,其储集空间以溶洞为主,裂缝为主要流通通道,溶洞、裂缝随机分布,具有网络状油藏的特征。裂缝和其连通的溶洞动力学尺寸较大,流体流动可以看成管道流动,基质渗透率很低,流体流动遵守达西定律。将渗流力学、流体力学知识相结合,建立了缝洞型油藏渗流与管流耦合模型,揭示了储集体内流体流动规律,并计算了单个缝洞系统中压力降落规律,计算结果表明,溶洞中压力降落远低于裂缝中压力降落。

Darcy-Stokes Mathematical Model for Fractured-cavity Carbonatite Reservoir

The fracture-pore carbonate reservoir is characterized by network reservoir,with cavity as the main accumulating space and fracture as the connection channel.The dynamic scale of fracture and the cavity connected is huge,and the flow of fluid in them can be described by Navier-Stokes equation.The permeability of the matrix is low,and flow of fluid in it conform Darcy's law.A couple model of seepage and pipe-flow for fracture-pore reservoir is established based on fluid mechanics in porous medium,and flow mechanism in the reservoir is studied,and pressure breakdown law in single fracture-pore system is calculated.