Highly permeable, remote reservoir
A development on land in central Africa consisted of three main fields that produced from reservoirs characterized by unconsolidated and highly permeable sands. The reservoirs comprised multilayered sands separated by reactive shales that added to the complexity of the basin.
Because completion intervals included both short and long single zones as well as multiple zones, an operator needed an efficient, reliable sand control completion system that would consistently provide simplicity, efficiency, and effectiveness in every well completed.
Because of the remoteness of the operation, selecting the right completion hardware and tools was critical to success.
After a multidisciplinary evaluation, Schlumberger and the operator decided that gravel packing was the best sand control technique for these wells. The project required a standardized completion system that provided the required efficiency and a gravel-pack packer working as a production packer.
Four sandface completions types
Four main gravel-pack completion types were used, including stand-alone screens, slurry packs, high-rate water packs, and frac packs. The frac packs were for either cased holes or open holes. The main screens used were wire-wrapped screens, with and without Alternate Path shunt tubes. Wells with multiple zones used the MZ Alternate Path system.