W&T Offshore, Inc. has made a subsalt discovery in a deep shelf exploratory well beneath its producing Mahogany field. The field is located in Ship Shoal Block 349 in the Gulf of Mexico.
The SS 359 A-14 well “has exceeded our expectations and is currently producing from the targeted T-Sand at an initial flow back rate of 3,030 barrels of oil per day and 5.6 million cubic feet of gas per day for a total of 4,000 barrels of oil equivalent per day,” the company said in a release.
The T-Sand is the deepest sand, at a depth of 17,200 feet total vertical depth. While drilling the discovery well, W&T discovered additional pay in three sand levels, all of which will add to the company’s estimated reserves. Well SS 359 A-14 also penetrated thicker main field pay sand and will serve as a future recompletion.
More than 370 feet of net oil pay was logged from the A-14 well, the company said, and additional drilling will occur in 2014 to further appraise the find.
"Our exploration team utilized our subsalt imaging technology to identify and deliver this subsalt discovery which is a deep shelf exploration extension to our producing Mahogany field. We found very high-quality oil sand in the T-sand reservoir with great flow characteristics,” said Tracy Krohn, W&T Offshore’s chairman and CEO, in a statement.
The company, which wholly owns and operates the field, anticipates that the unrisked reserve potential of the well is in the range of 1.8 to 6.2 million barrels of oil equivalent (boe).
The Mahogany field has been producing oil and gas since March 1997. Current average daily gross production from the field ranges at 9,150 boe. The water depth of the site is 360 feet.
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