A Lesson Learned from Slickline Deployed ESP System Field Trials in H2S Well Environment

Abstract

Electrical Submersible Pumps (ESP) are one of the most utilized artificial lift methods in the oil industry. A faster ESP replacement methodology is the ultimate solution to reduce the deferred oil production and reduce cost. This paper focuses on the lessons learned from the previous field trials of slickline deployed ESP systems, including the deployment procedure, benefits, installation challenges, reliability, and recommendations for future installations. Two different deployment concepts of slickline deployed ESP system were trial tested in mild and high H2S well environments. These systems employ a downhole wet-mate connector as a power delivery point connecting the permanent and retrievable completions to power the ESP motor. The trial test successful criteria are dictated by the proven concept of rigless ESP replacement and system reliability. Multiple elective ESP retrievals and reinstallations were performed using a slickline unit after operating for several months. The main objective was to evaluate the downhole electrical system reliability under actual production conditions. The new slickline deployed ESP concept minimized locked-in oil potential through safe and swift ESP replacement in a live well, enabling SIMOPS, and eliminating downtime time associated with the rig mobilization and flowline remanifolding. The design and reliability improvement on the electrical and mechanical systems of both concepts are essential to prolong the system's run-life in an H2S well environment. Moreover, the downhole completion strategy and metal-to-metal seal in the electrical system are believed to be key success factors to prolong the system run-life.