Niu Jilei

The Productivity-Enhancing Technique of Deep Penetrating Perforation With a High-Pressure Water Jet

Abstract Deep penetrating perforation with a high-pressure water jet is an emerging advanced technique for enhancing oil well productivity because of its high cutting, breaking, and cleaning capabilities. Based on the analysis of productivity impairment caused by drilling fluid invaded zone and conventional charge perforating compacted zone, production-enhancing mechanisms of deep penetration perforating with a high-pressure water jet have been comprehensively investigated. The three major aspects are rock cutting with a high-pressure and high-velocity water jet, relieving the stress concentration of the near-wellbore region, and penetrating through the damaged zone. In addition, the feasibility of improving formation fracturing and acidizing treatment by using this technique is also discussed, along with future development and application.

Combined high pressure water jetting and acidizing method for perforation cleaning and formation treatment : Mechanisms and applications

This paper presents the mechanisms and applications of combined high pressure water jetting and acidizing treatment of perforation hole and near-wellbore formation for enhanced oil production or enhanced water injection. The field application results on over 30 oil wells and water-injection wells in Shengli Oil Field and Huabei Oil Field of China demonstrated that this technology was simple in procedure, more successful than expected, had wide feasibility and prominent effectiveness for improving the productivity and injectivity of wells in high water-cut oil fields.