Gas/oil equation hampers Corvina well test

Offshore staff

HOUSTON -- BPZ Resources has completed one well and started another for its Corvina field development offshore Peru.

The CX11-22D well was drilled in an up-dip location to appraise the field’s oil and gas potential. It has been completed to simultaneously produce oil and to re-inject formation water as part of the transition to commercial production.

Petrophysical evaluation revealed that the well has around 75 ft (22.8 m) of net oil pay, 70 ft (21.3 m) of prospective oil pay in the lower zones, and 75 ft of net gas pay above the oil zones. It tested oil at around 300 b/d but with a high rate of associated gas arising from one of the higher intervals opened to help define the gas/oil contact.

Because of the high gas/oil ratios, BPZ failed to achieve a consistent initial production rate. However, well test data suggest this is not due to gas channelling, which affected previous wells.

BPZ plans to work over the well to isolate the gas sand once drilling of its latest well, CX11-23D, is completed and the field comes onstream. Currently, 22D is being produced intermittently to manage the gas produced with the oil.

The last well drilled from platform23D will be the CX-11. The company plans to start installing and commissioning gas and water re-injection equipment after it has been completed, with first commercial production scheduled for Nov. 30.


07/14/2010