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Friday, May 31, 2013
Irish independent Tullow Oil’s Calao-1x exploration well offshore the West African country of Cote d’Ivoire encountered condensate/gas bearing reservoirs in an Upper Cretaceous deepwater channel system. The Seadrill West Leo dynamically positioned semi-submersible drilled the Calao-1X well to a final depth of 4,570 meters in water depths of 1,906 meters.
The well, Tullow’s second on Block CI-103, was targeting an Upper Cretaceous channel system northwest of the Paon-1X well. While the Calao-1X encountered good quality reservoir sandstones in the main objective, they were water bearing. Tullow said that around five meters of condensate/gas bearing sandstones were found in a deeper objective.
The well was then sidetracked, targeting a better developed reservoir unit down-dip. Good quality water bearing sandstones were intersected at that level in the sidetrack. The sidetrack was then drilled to a final depth of 4,600 meters below sea level. Pressure data indicates that this zone may be in communication with the condensate encountered in the original Calao-1X well. Following completion of logging operations the well will be plugged and abandoned.
Commenting, Angus McCoss, Exploration Director, said: “While this is not the result we were aiming for, both the condensate and the reservoirs that we encountered have added substantially to our knowledge in this frontier area. The appraisal of the light oil discovered down-dip in Paon-1X in 2012 will continue later this year with the drilling of the Paon-2A well. Having sold some of our equity for carries in the CI-103 license – a decision that was taken prior to the drilling of the Calao-1X well – our stake in both the Calao-1X and Paon-2A wells has been consequently reduced.”
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