The role of temperature on optimal conditions in dolomite acidizing: An experimental study and its applications

Experimental results show that the optimal acid interstitial velocity increases with increasing temperature. However, the rate of increase between 122 °F and 185 °F is significantly larger than the rate of increase between 185 °F and 260 °F. It is due to the difference of increase for acid diffusion rate and surface reaction rate, which is discussed in this paper. Interestingly, unlike limestone, the corresponding optimal breakthrough pore volume decreases with increasing temperature from 122 °F to 185 °F, and increases slightly from 185 °F to 260 °F. This indicates that more volume of acid is needed for reservoirs of lower temperature. Based on the experimental results and an upscaling method, an application scheme is presented for dolomite reservoirs with varying temperatures, which can be used for engineering references.