Effect of produced carbon dioxide on multiphase fluid flow modeling of carbonate acidizing

Abstract A two-scale continuum (TSC) numerical model is used at pore and Darcy scales to optimize the matrix acidizing dissolution process. During process in carbonate reservoir, solubility of carbon dioxide, as one hydrochloric acid/calcite reaction products, limited, which leads formation a separate gas phase reservoir based on pressure temperature. The presence this free has nonlinear effect fluid flow distribution porous media due alteration relative permeability injected/spent acid. Density viscosity spent acid will also be changed. Ignoring these effects TSC can reduce accuracy final results compared similar laboratory studies. significance our study examine apply produced dioxide wormhole propagation, patterns, breakthrough curves different injection rates innovation presented evaluation gaseous during calcite injected This been numerically investigated solved along with governing equations time steps. In work, coupled consider dioxide. Density, viscosity, correlations are update properties propagation acid/rock interactions. show that neglecting affects estimation. shows better agreement experimental data predict rock patterns breakthrough. By considering gas, track thicker wormholes blockage slower rate. Our approach showed isothermal models not accurate enough change higher temperatures. Reduction acid's increases volume required for Hence, developed improves knowledge acidizing.