High-Concentration Hydrochloric Acid Aids Stimulation Results in Carbonate Formations

Abstract

Use of high concentrations O! hydrochloric acid in jract[tre acidizing treatments has solved the stitnnlution problems in many stnhborn reservoirs and has improved restdts in many others. Treatments oj this type were jirst designed jor injection well,y in the A neth field in Utah aboat a year ago. Titeir ase has now spread to n?any areas throl@ot4t North America. Saccess of the treatn?en IS has led to a re-evaluation oj the role oj acid concentt-ation in stintulution by acidizing. Extensive laboratory stndies and widespread freld experience have nttcovered many new jacts concerning acid concentration und have shown that sonte oj the older assnnrptions are not tr[te at all. This paper presents the technology of acid concentration and jactors involved in asittg high concentrations. Advantages of the strong acid are discussed, as well as the probletns (w~ch us inhibition and additive conrpatibility) encountered in its ase, A ctaal field examples are ased to sabstan tiate the work done to the present tinw.