An operator successfully executed two wireline through-tubing gas-shutoff (GSO) workovers in high-angle openhole-gravel-pack (OHGP) completions to isolate high-gas/oil-ratio (HGOR) zones, resulting in significantly increased oil production. This paper summarizes the GSO concept, completion modeling, job planning, completion-equipment testing, job execution, and production results from one of these two wells (the processes and results associated with the second well are detailed in the complete paper).
Introduction
All producers in the field of study were drilled from a 36-slot tension-leg platform (TLP) at a water depth of just over 1000 m. OHGPs are the preferred completion option in this field. It was recognized during the project-design phase that controlling unwanted gas and water in the future would be challenging.
