Pioneer Begins Production from Harrier Field

Pioneer Natural Resources reports that its Harrier field in the western deepwater Gulf of Mexico began producing January 8, 2004. The discovery well was developed as a single-well subsea tie-back to the Company's Falcon field facilities and is producing approximately 120 million cubic feet of gas and 300 barrels of condensate per day. The field was discovered less than one year ago, and the 11-month development establishes a new record for deepwater Gulf of Mexico operations. Pioneer operates the Harrier and Falcon fields with a 100% working interest.

Harrier is located 100 miles east of Corpus Christi in 4,100 feet of water in East Breaks block 759. Harrier is producing into a 47-mile flowline through the Falcon manifold back to the Falcon Nest platform on the Gulf of Mexico shelf. The Falcon Nest platform is owned and operated by GulfTerra Energy Partners, L.P.

Scott D. Sheffield, Pioneer's Chairman and CEO, stated, "Having completed the development of the Falcon field ahead of schedule in early 2003, the Harrier development team proposed an aggressive schedule for achieving first production and has again exceeded our expectations. They have raised the bar for efficiency in deepwater development coming in on budget for the 11-month program. The development team will now concentrate on completing the tie in of our two other Falcon corridor satellite discoveries, Tomahawk and Raptor, expected during the third quarter."