Physical Property Analysis and Sensitivity Damage Evaluation of Tight Sandstone Gas Reservoirs

Tight sandstone reservoirs are widely distributed in China, because tight reservoirs have the characteristics of low porosity and low permeability, high clay mineral content, etc., it is easy to cause reservoir damage during hydraulic fracturing and is not easy to recover. X-ray whole-rock diffraction analysis was carried out through tight sandstone reservoir core, and the proportion of sensitive minerals in tight sandstone gas reservoir was clarified, and water sensitivity and flow velocity sensitivity damage experiments were carried out based on the test results. The experimental results show that the flow velocity sensitivity damage rate of tight sandstone reservoir is 28.02%, and the critical flow rate is 0.75ml/min, which is a weak flow rate sensitivity injury. The water-sensitive injury rate was 63.98%, which was moderately strong water-sensitive injury.