The Evolution of Multizone Stand Alone Screen Completion Practices in Mahakam Delta A Pilot Project Result

Abstract

Tunu is a giant gas field located in Delta Mahakam, East Kalimantan, Indonesia operated by Total E&P Indonesie. The field development targets two domains: Tunu Shallow Zone (TSZ) and Tunu Main Zone (TMZ). The primary objective of TSZ completion is to have a cost effective sand control methodology to ensure economic vialibility of the wells since TSZ consist of small elliptical shaped deltaic sand bodies containing low reserve gas pockets with a typically short production life. Multi zone single trip gravel pack (MZ-STGP) systems have been utilized as sand control completion methodology. Technical limitations of these techniques in terms of zone spacing, number of zones and well deviations drove the need developping an alternative completion technique. Using short screen assembly and open-hole isolation technology, a unique multi zone open hole stand alone screen (MZ- SAS) system was developed. The initial development consists of 14 wells. Both low and high angle deviated wells, numbers of different completion jewelries and different type of reservoir drill-in fluids (RDIF) have been used over the initial phase of the development. The objective of this paper is to review the evolution and improvements in the drilling, fluid, completion and specific post well completion strategy. This has provided a best practice for future completions in the development of similar reservoirs in the portfolio.