Numerical Simulation of the Wormhole Propagation in Fractured Carbonate Rocks during Acidization Using a Thermal-Hydrologic-Mechanics-Chemical Coupled Model

Acidizing is a widely adopted approach for stimulating carbonate reservoirs. The two-scale continuum (TSC) model the most used simulating reactive process in reservoir during acidizing. In realistic cases, there are overburden pressure and pore at present. When injected acid reacts with rock, dissolution of rock consumption will break mechanical balance rock. Many experimental studies show that cores after acidizing have lower strength. However, it still not clear how deformation rocks by change ground stress influences dynamics. For fractured reservoirs, fractures play leading role flow acid, which preferentially flows into dissolves fracture walls. effect combined action broken wall on formation wormholes reservoirs remains to be studied. To address above-mentioned issues, thermal-hydrologic-mechanical-chemical coupled presented based TSC studying wormhole propagation under practical conditions. Linear radial cases simulated investigate distribution, reaction temperature, effective simulation results more branches formed if perpendicular direction acid. Temperature key parameter affecting acidification patterns, so influence temperature cannot ignored design. As increases, diameter gradually decreases, branching decreases. More needed same stimulation result higher stress.