Study on the Causes of Water Blocking Damage and Its Solutions in Gas Reservoirs with Microfluidic Technology

The water blocking damage to the reservoir caused by invasion of external fluid is one main factors that affect efficient development tight sandstone gas reservoirs. In this paper, microfluidic chip technology used explore causes in porous media and find suitable recovery solutions. research results show reducing gas-liquid capillary pressure can effectively reduce rate quantity spontaneous speed cores. After chemical treatment, liquid phase fluidity non-fractured matrix core increased 1.72 times, fractured 2.13 times. wetting media, there are mainly four types hold-up: (1) Liquid hold-up dead volume a non-connected pore; (2) pore throat with small inner diameter cannot be driven away due its larger pressure; (3) Adsorption viscous force, adsorbed on surface solid phase; (4) Reservoir heterogeneity. removed certain extent changing injection pressure, method, or adding modifier.