Tullow's Enyenra-2A appraisal well proves major light oil field offshore Ghana

By Phaedra Friend Troy

Tullow Oil (LSS:TLW) has successfully transected light oil in excellent-quality sandstone reservoirs with its Enyenra-2A appraisal well in the Deepwater Tano license offshore Ghana.

The appraisal well confirms "good evidence of communication" with the Owo-1 discovery well, which has now been renamed Enyenra. Tullow contends that Enyenra is "a major light oil field."

Situated in waters measuring 1,674 meters deep, the Enyenra-2A well was drilled by the Deepwater Millennium drillship to a total depth of 4,234 meters.

Located more than 7 kilometers south and down-dip from the discovery well, Enyenra-2A was drilled to appraise the upper and lower channels of the oil field. Results from the drilling, wireline logs, reservoir fluid samples and pressure data depict the Enyenra-2A well transected 21 meters of net oil pay in the upper channel and 11 meters of net oil pay in the lower channel.

Additionally, pressure data from the upper channel showed that the oil is in communication with the Owo-1 well, and similar data from the lower channel point to the well being in communication with the deeper pools encountered in the Owo-1 and its sidetrack.

Furthermore, the appraisal well tested a deeper Turonian fan, encountering 5 meters of gas condensate-bearing sandstones. Interpretation of this zone is continuing.

“The discovery of oil this far down-dip in Enyenra-2A, and the confirmation of its communication with the Owo-1 oil discovery, is an exceptional result," said Angus McCoss, exploration director for Tullow. "This represents a major step forward in the appraisal of the Enyenra-Tweneboa area and is highly encouraging for our target to declare commerciality later this year."

The Enyenra-2A is being suspended for later use, and the next appraisal well will be the Enyenra-3A located up-dip to the north of the discovery well.

Remaining on the Deepwater Tano license, the Deepwater Millennium will now move to complete the drilling of the Tweneboa-4 well.

"We are now looking forward to leveraging our expertise in the Jubilee play across the Atlantic through drilling the high-risk, high-impact, Zaedyus prospect in French Guiana in March," McCoss added.

Tullow serves as the operator of the Deepwater Tano license with 49.95 percent interest. Project partners include Kosmos Energy with 18 percent, Anadarko Petroleum with 18 percent and Sabre Oil & Gas with 4.05 percent.

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