May. 2012 - ATP reports that two wells at the Clipper field are on schedule to begin production in late 3Q or 4Q 2012. Both wells were drilled and completed in 2011, and ATP has begun preparatory work for the installation of the Clipper pipeline during 3Q 2012.

Dec. 2011 - ATP has successfully completed and tested the second Clipper well on the field in the deepwater GOM, which flowed at rates of 9,000 Bbls per day and 4.6 MMcf/d. This well, combined with the first Clipper well, brings the total test rates to about 13.7 MBbls of oil per day and 50.2 MMcf/d of natural gas or 22 MBbls equivalent per day. The well logged about 56 feet (17 meters) of net oil pay, confirming reserves previously booked. ATP has hired a pipeline lay barge for the Clipper wells until 3Q 12, and will tie-in both the GC 300 No. 4 and No. 2 wells to the Murphy Oil-operated Front Runner production facility. Clipper No. 4 is located at Green Canyon Block 300, and resides in 3,450 feet (1,052 meters) of water. ATP operates Green Canyon block 300 with a 55 percent working interest.

Nov. 2011 - ATP said that operations are continuing at the second Clipper well, No. 4, at Green Canyon Block 300. The operator said it has encountered oil pay sands, specifically, 56 feet (17 meters) of logged net oil pay, confirming already booked reserves. Completion operations are underway at the well. Production at the field is still scheduled to begin in the third quarter of 2012. ATP operates Green Canyon block 300 with a 55 percent working interest.

Aug. 2011 - ATP O&G stated it commenced well operations with the Diamond Ocean Victory semisub on the Clipper field (No. 2 well, Sidetrack No. 1), located on Green Canyon Block 300, during the second quarter of 2011. In July, after completing the well, it flowed at a rate of 45.6 MMcf/d plus condensate of 4,656 barrels per day. The well is scheduled to be placed on production in the middle of 2012 after completing construction of a pipeline and connecting the well to existing infrastructure. After completing the well, the semisub will move to the GC No. 4 well, re-enter and sidetrack it to the targeted oil zone. All required permit applications were submitted to BOEMRE, stated the company. ATP wholly owns and operates the Clipper field.

Apr. 2011 - ATP received a permit to complete a previously drilled No. 2 well at Green Canyon block 300 on the Clipper field in the deepwater Gulf of Mexico. The well, located in 3,454 feet (1,053 meters) of water, was sidetracked, encountering a gas reservoir between 15,590 and 15,721 feet (4,752 and 4,792 meters) total vertical depth in 2006. ATP plans to commence well operations using the Ocean Victory semisub in 2011. ATP operates Green Canyon block 300 with a 55% working interest.

Dec. 2009 - ATP Oil and Gas Corporation has submitted a Development Operations Coordination Document (DOCD) to MMS for its Clipper development project. The DOCD proposes to sidetrack and complete well No. SS002 at Green Canyon Block 299 (BH-GC300). The plan also covers installation of the lease term pipeline and production startup of subsea well No. 004. Clipper is currently under development as a subsea tie-back to the Front Runner Platform at GC 338.

May. 2009 - Bluewater Industries awarded a contract to Technip for subsea services on the Clipper Corridor field. Located on Green Canyon Block 299 in waters measuring 3,460 feet (1,055 meters) deep, Clipper is being developed as a subsea tie-back to the Front Runner platform. Technip's scope of work includes the flexible risers, oil flowline, umbilical, four subsea structures, jumpers and flying leads. Installation is scheduled for 2Q 2010. ATP is the operator of Clipper with 55% interest, and Bluewater Industries serves as the project manager.

Jul. 2008 - ATP says that Diamond's Ocean Victory is scheduled to sidetrack and complete one well and a complete a second at its Clipper field during the first half of 2009. ATP expects to add the undeveloped reserves at Clipper to its proved and Probable reserves during 2008.

Jun. 2008 - ATP Oil & Gas Corporation has acquired a 55% working interest in Clipper, with wells located in approximately 3,400 feet water in the Gulf of Mexico. First production is slated for late 2009.

Dec. 2007 - Pioneer Natural Resources expects fourth quarter net income to include an after-tax gain of approximately $50 million related to the net effect of several unusual items. These items principally include the previously announced gain on the sale of the Company's Canadian operations, partially offset by a charge related to the Company's withdrawal from the Clipper project in the deepwater Gulf of Mexico.

Feb. 2006 - Pioneer Natural Resources has entered into a purchase and sale agreement through which Marubeni Offshore Production (USA) Inc., a subsidiary of Marubeni Corporation, will acquire certain deepwater Gulf of Mexico assets from Pioneer for cash proceeds of $1.3 billion.

Oct. 2005 - Pioneer Natural Resources has made a discovery on its Clipper prospect in the Green Canyon 299 Block in the deepwater Gulf of Mexico. Pioneer operates the block with a 55% working interest.