Cairn's third discovery at KG-DWN-98/2

Vol 5, PW 19 (07 Nov 01) Exploration & Production

Champagne bottles are out at Edinburgh-based oil and gas explorer Cairn Energy.

Cairn has made another hydrocarbon discovery in its eastern offshore deepwater block KG-DWN-98/2. On 31st October Cairn confirmed its third discovery in four months on this block.

Cairn said it had completed a "drill stem test on the Prospect 'M' oil discovery on Block KG-DWN-98/2". Exploration well DWN-M-1ST exploration well encountered two hydrocarbon-bearing units.

"The first comprised thin gas bearing sands and was not tested. The deeper second unit consisted of 150 metres of continuous well developed reservoir quality sandstones." This unit contained a 46 metre gross hydrocarbon-bearing interval including a "42 metre net oil column between a defined gas oil contact and an oil water contact." The oil-bearing zone was perforated between 2,081 metres and 2,092 metres.

On test the zone flowed at a stabilised rate of 5,998 barrels a day and 3.87 million cubic feet of gas a day at a flowing wellhead pressure of 1,130 pounds/square inch on a 48/64 inch choke and with a gas to oil ratio of 645 cubic feet/barrel of oil. The oil has API gravity of 35 degrees.

Cairn reckons initial reserve estimates for the "M" discovery in the tested sandstone unit are between 40m-60m barrels of oil. The drilling rig will now move to Prospect "Q", located approximately 15-km to the southwest of the M discovery.