低渗透岩心启动压力测试研究

Research of Low Permeability Core Start-up Pressure Text

随着国内油气藏的开发,低渗透油藏所占比重逐渐增大,而低渗透油藏存在启动压力。启动压力的产生是由于边界层的存在和流体的塑性流动。文章采用稳态法和非稳态法测定了低渗透油藏岩心启动压力梯度。实验表明,在同一粘度情况下,启动压力梯度随岩心渗透率的增大而减小;稳态法较非稳态法易实现。

As the development of domestic oil and gas reservoirs, the proportion of low permeability oil reservoirs gradually increases, and low permeability reservoirs exists start-up pressure. The existence of start-up pressure is a result of the boundary layer and plastic flow of the fluid. The start-up pressure gradient of low permeability core was determined by steady-state method and unsteady-state method in the paper, Experiments shows that the start-up pressure gradient decreases with the increase of core permeability under the condition of the same viscosity; the steady-state method is easier than the unsteady-state method to realize.