Increasing the stimulation efficiency of heterogeneous carbonate reservoirs by developing a multi-bached acid system

In short, firstly, in this work the acid distribution rate mechanism (pathway) between the reservoir layers was investigated by simulating the executed actual matrix acidizing operation in the considered well. Then, The self-diverting emulsified acid SDEA (which can be used as a diverter) was developed. Moreover, the main batch of stimulation fluid was developed by analyzing different acid mixtures with various concentrations. Lastly, the efficiency of the developed multi-bached acid system was evaluated by conducting the core-flood experiment. The results show that the developed multi-batch acid stimulation system is significantly efficient for stimulation of the heterogeneous carbonate reservoirs where there is a big difference between the permeabilities of the producing formations so that the stimulation of both layers (with different permeability values) can be accomplished in a more uniform manner.