Exhibit 23.9


           CONSENT OF INDEPENDENT PETROLEUM ENGINEERS AND GEOLOGISTS


As independent petroleum engineers and geologists, we hereby consent to the
inclusion of the information included or incorporated by reference in this
Registration Statement Form S-3 with respect to the oil and gas reserves of
National Offshore LP as of December 31, 2004, and December 31, 2005, which
information has been included or incorporated by reference in this Registration
Statement Form S-3 in reliance upon the reports of this firm and upon the
authority of this firm as experts in petroleum engineering. We hereby further
consent to all references to our firm included in this Registration Statement
Form S-3.


                                         NETHERLAND, SEWELL & ASSOCIATES, INC.




                                         By: /s/ Frederic D. Sewell, P.E.
                                            ---------------------------------
                                            Frederic D. Sewell, P.E.
                                            Chairman and Chief Executive Officer

Dallas, Texas
April 17, 2006