Chad Development Project consists of three fields (Kome, Miandoum, and Bolobo) in the Doba basin. Completions in the Upper Cretaceous reservoirs must address the following characteristics:Unconsolidated permeable sands (0.5 < k > 20 Darcies).Large average particle sizes (100 to 1,000 microns).Broad particle size distributions (uniformity coefficient-d10/d50-ranging from 3 to 8+).Sand layers separated by highly reactive shale.Low-gravity, high-viscosity crude oil (30 cp to 400+ cp).Separate oil/water contacts for different sand intervals.Completion interval lengths spanning a few tens of feet for a single sand to several hundred feet commingling several sands. It is a challenge to design an efficient and reliable sand-control completion for these characteristics. Individual sand-control completion designs were evaluated by a multidisciplinary completion team (geology, reservoir, completion, and production engineers). To date, five types of sand-control completions have been used in the Chad project: high-rate water packs (HRWPs), frac packs (FPs), frac packs using shunt tubes (FPw/Shunts), FPw/Shunts and an isolation Packer (FPw/shunts&IP), and openhole stand-alone screens (OH-SAS). Only cased hole completions are addressed in this paper. When this paper was prepared, 51 sand-control completions had been installed in Miandoum field. Initial postcompletion well performance was measured using short duration (24- to 48-hr) cleanup and test periods. A significant learning curve for completion quality and operational efficiencies was overcome by both operations and engineering teams working together closely to improve techniques. This paper will describe the technical and operational hurdles as well as the results achieved with various completion methods. Introduction The Chad Development, which consists of three fields, is located in southern Chad approximately 430 km south of N'Djamena (Fig. 1). This paper will focus on the Miandoum completions, where the majority of work has been completed. The first oil production from Miandoum to fill surface facilities and the pipeline commenced on July 24, 2003 as this paper was being prepared.
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