In a press release copied to ghanabusinessnews.com, the leading oil producer in Ghana, Tullow Oil says its Tweneboa-3 appraisal well in the Deepwater Tano licence offshore Ghana has successfully encountered gas condensate in excellent quality sandstone reservoirs.
According to Tullow, results of drilling, wireline logs and samples of reservoir fluids, together with the well’s down-dip position confirms the Greater Tweneboa Area resource base potential.
The well which is located over six kilometres south-east of the Tweneboa-2 well and 12 kilometres south-east from the Tweneboa-1 discovery 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. Within prognosis, this leg encountered thin reservoir sands and approximately 9 metres of gas condensate pay, it says.
The well was then sidetracked 550 metres west, targeting the significant Ntomme anomaly, an area of strong seismic response. This leg successfully encountered a gross vertical reservoir interval of approximately 65 metres containing 34 metres of net gas condensate pay in two zones of high quality stacked reservoir sandstones.
Tullow indicates that work is underway to integrate seismic, pressure and hydrocarbon phase data in order to progress development options for the Tweneboa and Enyenra (Owo) fields in the Greater Tweneboa Area.
Tweneboa-3 was drilled by the Deepwater Millennium drillship to a total depth of 3,906 metres in a water depth of 1,601 metres. On completion of operations, the well will be suspended for future use in the field development.
By Emmanuel K. Dogbevi