Tullow Oil’s Tweneboa-3 appraisal well in the Deepwater Tano license offshore Ghana has encountered gas condensate in sandstone reservoirs. Wireline logs and samples of reservoir fluids along with the well's down-dip position confirms the well’s resource base potential.
The well was drilled by the Deepwater Millennium drillship to a total depth of 3,906 m in a water depth of 1,601 m. It is located 6 km southeast of the Tweneboa-2 well and 12 km from the Tweneboa-1 discovery well. The well was planned with two deviated boreholes to test separate areas of the Tweneboa field. The first leg was drilled to calibrate the potential of an area with a very weak seismic response, and encountered thin reservoir sands and about 9 m of gas condensate pay. The well was then sidetracked 550 m west, targeting the significant Ntomme anomaly, an area of strong seismic response. This leg successfully encountered a gross vertical reservoir interval of abouty 65 m containing 34 m of net gas condensate pay in two zones of high quality stacked reservoir sandstones. On completion of operations, the rig will remain in the Deepwater Tano block to drill the top-hole section of the Tweneboa-4 appraisal well.
Tullow operates the Tano license and with partners Kosmos Energy Ghana, Anadarko Petroleum, Sabre Oil & Gas and the Ghana National Petroleum Corp.
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