Foam-diverting technique improved sandstone acid jobs

Abstract

Often it is difficult to adequately treat the entire perforated interval in a damaged, gravel packed well. Foam was evaluated in the lab as a diverting technique for hydrofluoric (HF) acid treatments, and encouraging results led to field evaluation of foam diverting in 12 Gulf of Mexico wells. Two different techniques were used in these treatments and production data was used to evaluate the results. Also, temperature logs were run before and after one treatment to further study the benefits of foam. Advantages and disadvantages of foam diverting as well as treatment design procedures for foam diverting in matrix hydrofluoric acid treatments are presented in this article.