Case Study of the Effectiveness of Nitrogen Foam and Water-Zone Diverting Agents in Multistage Matrix Acid Treatments

Abstract

Summary Several oil wells producing water have been stimulated successfully with multistages of mud acid, nitrogen foam, and water-zone diverting agents. This procedure has improved well performance significantly while having little or no effect on post-treatment water production. The diverters’ effectiveness was analyzed with radioactive tracers, gamma spectroscopy logs, and surface pressure equipment. Results indicate that water-zone diverters and nitrogen foam are effective diverters when used in matrix acid stimulations. Case histories and associated data are included in this paper.