Experimental Investigation of Improved Acid Stimulation in Carbonates

In this study, we aim to experimentally revisit standard acid stimulation techniques and to test novel pumping sequences including water mitigation and diversion. After state of the art characterization of the selected carbonate samples, injections of acidic solutions are performed at elevated temperatures and pressures using dedicated single and dual core apparatus at the core scale.It has been found that, wormholing behavior and mainly the pore volume to breakthrough is strongly dependent on the acid type and the pumping mode. For retarded acids, such as emulsified acids, the existence of the optimum pore volume to breakthrough is challenged.The efficency of different pumping sequences on water mitigation and diversion is discussed.