Petroplus, partners finish appraisal drilling at Castanha oil field, await production tests to declare commerciality onshore Angola

Source: ROC Oil

Lacula Oil Company Limited, a wholly owned subsidiary of ROC Oil, advises that the Castanha-4 appraisal well has been drilled to a total measured depth of 2,343 meters and has been suspended following a preliminary drill stem test. Initial evaluation has indicated that the well encountered a gross hydrocarbon column of approximately 15 meters in the Chela Formation.

Production testing of the Castanha-2, Castanha-3 and Castanha-4 appraisal wells is planned to commence over the coming weeks.

Following the completion of production testing operations, the Joint Venture will then decide on whether to declare Castanha as a Commercial Discovery. This decision is anticipated during the first half of 2011.

First discovered in 2010, the Castanha oil field is located on the Cambinda South Block onshore Angola, near the Coco discovery of 2008 and the Massambala discovery of 2007.

Castanha Oil Discovery

The Castanha-1 exploration well was drilled from 4Q 2009 to 1Q 2010. The well encountered a gross hydrocarbon column of approximtely 15m in the pre-salt Chela Formation which was production tested. The test recovered 33o API oil to surface and flowed oil at a maximum rate of 2,275 BOPD through a 5/8" choke. The potential of the discovery is being evaluated. 

The Castanha-2 appraisal well was drilled in 3Q 2010. Initial evaluation indicated that the well encountered a gross hydrocargon column of 21m in the Chela Formation. The well was suspended and production testing is planned to commence in 4Q 2010 following the drilling of Castanha-3. 

The Castanha-3 appraisal well commenced drilling on 20 September 2010 and is currently in progress.
Acquisition commenced in late September 2010 for a 169km2 3D seismic acquisition programme (overlapping the north of the Castanha discovery) to define new exploration leads and assist with mapping of the discovery.

Participating Interests in the Cabinda Onshore South Block are Pluspetrol Angola Corporation (Operator) with 45 percent interest, Lacula Oil Company Limited (ROC) with 10 percent, Force Petroleum de Angola, S.A. with 20 percent, Sonangol P&P, S.A with 20 percent, and Cuba Petroleo with 5 percent.

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