LONDON, June 27 -- Midwestern Oil & Gas Co. PLC, operator of Umusadege field in the central Niger Delta, has cased and suspended the UMU-4 well, said field partner Mart Resources Inc.
The consortium, which also includes Suntrust Oil Co. Nigeria Ltd., inserted production casing in the well to 8,818 ft TD before evaluating the well information, which was integrated into a revised 3D seismic interpretation of the field.
Umu-4 tested light oil of 38-44° gravity from three good-quality sandstone reservoirs at 7,730-8,276 ft, Mart Resources said. "Although the oil pays encountered in each of these sand reservoirs were thin (combined net pay of 15 ft), they are believed to represent the edge of [a] potentially much thicker oil pay to the southeast of Umu-4, where current seismic interpretation shows the structure to rise considerably at these depths."
Umusadege field contains 16 oil-bearing reservoirs at 6,500 ft-9,500 ft. The crude quality varies at 23-41° gravity. The partners will develop the field by drilling three initial delineation wells, each located on separate structural highs.
The consortium has moved the NRG Rig 101, which drilled UMU-4, to the Umusadege UMU-1 well, which Elf drilled and cased in 1974. "The partners will perforate and production-test a number of oil sands that were identified in the well from logs and wireline tests," Mart Resources said.
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