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Hydrochloric acid effectively dissolve calcium carbonate mineral present in the filter cake and theformation, but is not capable of dissolving or degrading some of mud damaging components (polymers).Lab results indicate that the conventional acidizing practice was not effective and yielded a loss in theinitial core permeability of more than 80%. Based on lab findings, an initial stage of flowing back the wellprior to acid stimulation was recommended. This stage was intended to remove as much as possible ofmud debris and prevent some polymers from penetrating into the formation, a main cause of injectivitydecline. It will also improve the contact of injected acids with the treated formation.Application of this technique in three carbonate power water injectors resulted in significant improvementin their injectivity index. The paper presents six field cases in the same carbonate formation: three wellswere treated with the typical acid stimulation practice and the others were treated using the new method.The post treatment injectivity tests revealed that the wells treated using the new method had more than 2-fold increase in injection rates at lower injection pressures compared with those treated using the typicalacid stimulation practice.

An Effective Approach to Improve Acid Stimulation of Low-Permeability Carbonate Formation in Long Horizontal Water Injection Wells: Case Histories