Effect of fluid diversion on the acid stimulation of a perforation

A previously developed model which considers the effect of acidizing on the productivity of a single perforation penetrating a sandstone reservoir has been extended to take into account the effect of particulate diverting agents on the distribution of acid inside the perforation. Cases have been run that simulate various types of formation damage, including damage from drilling mud infiltration and damage caused by perforating itself. The model predicts the evolution of the perforation skin factor as acid dissolves formation minerals in the surrounding region. The primary result of this work is that, for the types of damage simulated, fluid diversion within a perforation has little effect on stimulation performance. Although the diverting agent does significantly change the distribution of the acid at the perforation surface, in the formation the acid tends to migrate rapidly to undamaged regions. This paper presents the results from a series of case studies, with emphasis on the effect of fluid diversion inside a perforation.

Effect of fluid diversion on the acid stimulation of a perforation Conference Paper