Accurate sectional and differential acidizing technique to highly deviated and horizontal wells for low permeable Sinian Dengying formation in Sichuan Basin of China

Abstract

Article highlights According to the characteristics of dispersed and superimposed development of high-quality reservoirs in long horizontal section, the acid fracturing process criterion of "one section and one policy" was established. The acid fracturing process criteria for reservoirs with different transformation potential are established, and the pertinence of acid fracturing transformation is improved. Gel acid fracturing process is adopted for high-quality reservoir, the acid fracturing process of authigenic acid preflush is adopted for medium reservoir and the acid fracturing process of multistage alternating injection of authigenic acid preflush + gelled acid is adopted for low-quality reservoirs. The targeted reconstruction of strong heterogeneity long well section is realized.

Keywords

• Dengying unit
• Low formation quality
• Carbonate
• Accurate sectional
• Differential acidizing