EX-5.3 4 a2194867zex-5_3.htm EXHIBIT 5.3
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Exhibit 5.3

Ref.: 1808.17633

October 9, 2009                                                 

United States Securities and Exchange Commission

Re: Registration Statement on Form F-9 dated October 9, 2009
(the "Registration Statement") of Canadian Natural Resources Limited

Dear Sirs:

        We are a firm of independent petroleum consultants of Calgary, Alberta having prepared evaluation reports entitled "Evaluation of the P&NG Reserves of Canadian Natural Resources Limited in North America (As of December 31, 2008) Based on Escalated Prices and Costs", "Evaluation of the P&NG Reserves of Canadian Natural Resources Limited in North America (As of December 31, 2008) Based on Constant Prices and Costs", "Evaluation of the P&NG Reserves of CNR International in the North Sea, United Kingdom and Offshore West Africa (as of December 31, 2008) Based on Escalated Prices and Costs" and "Evaluation of the P&NG Reserves of CNR International in the North Sea, United Kingdom and Offshore West Africa (as of December 31, 2008) Based on Constant Prices and Costs", all dated February 25, 2009 (the "Reports"); of certain oil and gas properties of Canadian Natural Resources Limited.

        We refer to the Registration Statement relating to the offering of Debt Securities by Canadian Natural Resources Limited and hereby consent to the reference to our firm under the heading "Experts" and to the use of our Reports which are incorporated by reference in the Registration Statement.

Sincerely,

SPROULE ASSOCIATES LIMITED

Original Signed by
Harry J. Helwerda

Harry J. Helwerda, P.Eng.
Executive Vice-President

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Exhibit 5.3