Integrated Study for Well Productivity Enhancement in a Heavy Oil Reservoir in Northern Kuwait

Abstract

Focused well reviews were carried out to identify productivity enhancement opportunities in a heavy oil reservoir in Northern Kuwait. In an integrated effort, involving multi-disciplinary and cross-functional teamwork, well and reservoir management opportunities were assessed. The goal was to recommend well restoration and optimization opportunities for short, medium and long-term implementation, thereby creating a business impact. The process involved an in-depth comprehensive review of 59 wells. Available completion, production and pressure build-up data were tuned to analytical well models to assess individual well. Inflow performance analyses and the sensitivity check were done for drainage volume. Based on the difference between actual well performance and its estimated potential, production enhancement opportunities for the under-performing wells were estimated with proper engineering judgement. Initial Productivity Indices (PI) were found to be consistently higher than actual well performance during the production phase, potentially due to initial flush production and short duration of the initial tests. Design of facilities, well configurations (deviated wells) and sand production were also investigated and found to have some degree of impact on well performances. Out of 59 wells reviewed, opportunities were identified for 44 wells (~75%). Out of these, 26 wells were identified for productivity enhancements methods and water shut-off/management (18 wells). Once recommendations are implemented, oil production is expected to increase by 20%. Results obtained from the study indicates that the approach of suitable inflow management is a critical aspect to the heavy oil recovery project. This approach could be applied to other heavy oil projects with practical challenges of oil production with managed gas and water productions to maximize recovery.