Abstract
With the decrease of formation pressure, high temperature and high salinity reservoirs are prone to salting out, which leads to the blockage of reservoir pore throat and the decrease of oil recovery. The gas-liquid two-phase seepage mechanism when the formation pressure is lower than the saturation pressure is simulated by changing gas-liquid injection volume ratio, and metallographic microscope and probabilistic statistical method were used to analyze the degree of plugging caused by salting out in displaced cores. The research shows that when the reservoir pressure is slightly lower than the saturation pressure, it is beneficial to improve the reservoir recovery, but when the reservoir pressure is too low, the salting out phenomenon is serious, the reservoir pore throat is blocked, and the reservoir permeability and recovery are significantly reduced. The reservoir blockage mainly occurs at the end of production, and the regularity of blockage degree is in line with the characteristics of exponential variation.
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