ATP Successful North Sea L6 Well Test

ATP Oil & Gas reports the completion and testing of the L6d-S1 well in the Dutch Sector of the North Sea. The well was successfully completed in the Jurassic Terschelling Sandstone and flowed back at a rate of up to 53 Mmcf/d at 3910 psi ftp to prepare the well for production. The L6d-S1 logged approximately 88 feet of net pay, 26 feet updip of the original #2 well. ATP is operator of the production license and has a 50% working interest.

The L6d-S1 well will be a subsea completion with a 41 km tie back to a third party platform. The subsea wellhead is installed, and the flowline and umbilical have been laid and await tie back at the host platform before the startup of production which is expected in the fourth quarter of 2005. The operator of the host platform, Gaz de France, is in the process of installing a satellite production platform for the reception of gas from several fields, including L6 gas.

"With the successful completion and testing of the well, which ATP aggressively advanced, the project development can move forward to the final phase of facility hookup," said T. Paul Bulmahn, ATP's Chairman and President. "L6 marks an ATP first Dutch North Sea achievement, while simultaneous deepwater and shelf projects in the US Gulf of Mexico and also one in the UK North Sea remain on track for fourth quarter 2005 production."

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