Pioneer Updates Plans for MLP Offering



    DALLAS, November 27 /CNW/ - Pioneer Natural Resources Company (NYSE:  PXD)
announced today that Pioneer Southwest Energy Partners L.P. now intends to
close its planned initial public offering of common units during the first
quarter of 2008, rather than the fourth quarter of 2007 as previously
announced. The closing has been delayed due to year-end market conditions, and
the timing of the closing in 2008 will depend on market conditions at the
time.

    Pioneer Southwest Energy Partners L.P. is a limited partnership formed by
Pioneer Natural Resources Company to own producing oil and gas properties in
the Spraberry field in the Permian Basin of West Texas, and to acquire
producing oil and gas properties in its area of operations.

    Pioneer Natural Resources Company is a large independent oil and gas
exploration and production company, headquartered in Dallas, Texas, with
operations in the United States, South Africa and Tunisia. For more
information, visit Pioneer's website at www.pxd.com.

    A registration statement relating to the common units of Pioneer
Southwest Energy Partners L.P. has been filed with the Securities and Exchange
Commission but has not yet become effective. These securities may not be sold,
nor may offers to buy be accepted, prior to the time the registration
statement becomes effective. This communication does not constitute an offer
to sell or the solicitation of an offer to buy nor shall there be any sale of
these securities in any state in which such offer, solicitation or sale would
be unlawful prior to registration or qualification under the securities laws
of any such state or jurisdiction.

    The offering of common units will be made only by means of a prospectus.
A copy of the prospectus, when available, may be obtained by submitting
requests to Citigroup Global Markets Inc., Attention: Prospectus Department,
Brooklyn Army Terminal, 140 58th Street, 8th Floor, Brooklyn, New York 11220,
phone: 718-765-6732, fax: 718-765-6734; Deutsche Bank Securities Inc.,
Attention: Prospectus Department, 100 Plaza One, Jersey City, New Jersey
07311, phone: 800-503-4611, or email: prospectusrequest@list.db.com; or UBS
Securities LLC, Attention: Prospectus Department, 299 Park Avenue, New York,
New York 10171, phone: 212-821-3000.

    Except for historical information contained herein, the statements in
this News Release about Pioneer Natural Resources Company are forward-looking
statements that are made pursuant to the Safe Harbor Provisions of the Private
Securities Litigation Reform Act of 1995. Forward-looking statements and the
business prospects of Pioneer Natural Resources Company are subject to a
number of risks and uncertainties that may cause Pioneer's actual results in
future periods to differ materially from the forward-looking statements. These
and other risks are described in Pioneer's 10-K and 10-Q Reports and other
filings with the Securities and Exchange Commission.

    Except for historical information contained herein, the statements in
this News Release about Pioneer Southwest Energy Partners L.P. are
forward-looking statements that are subject to a number of risks and
uncertainties that may cause Pioneer Southwest Energy's actual results in
future periods to differ materially from the forward-looking statements. Risks
related to an investment in Pioneer Southwest Energy, including risks relating
to its business, are described in the registration statement filed with the
Securities and Exchange Commission. No assurance can be given that the
offering of Pioneer Southwest Energy will be completed or that it will be
completed on the terms described in this News Release.




For further information:

For further information: Pioneer Natural Resources Company Investors:
Frank Hopkins or Scott Rice, 972-444-9001 or Media and Public Affairs: Susan
Spratlen, 972-444-9001

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PIONEER NATURAL RESOURCES COMPANY

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