有效压力对低渗透变形介质油藏物性影响的研究

Influences of effective pressure on petrophysics of low-permeability reservoirs with deformable medium

通过文东地区岩心模拟实验,对低渗透变形介质油藏岩石渗流特性、变形特征进行了系统研究。表明压力高低、加压速度快慢、加压方式等对油藏渗流和变形产生显著影响。常规"渗透率"是与驱动压差和有效压力相关的变量。压力初始变化和幅度严重影响储层变形程度,因此开采初期合理控制压差对油藏最终采收率的提高至关重要。

A systematic study of percolation behaviors and deformation characteristics in low-permeability reservoirs with deformable medium is carried out through simulated test on core samples from Wendong area. The result suggests that pressure magnitude, pressurizing velocity and manner, and etc. , play important roles in percolation and deformation of reservoirs. The regular permeability is a variable relating to driving pressure difference and effective pressure. The initial pressure difference and its amplitude exert tremendous influence upon the reservoir deformation. Therefore the enhancement of oil recovery relies heavily upon a rational control of the initial pressure difference.