Exhibit 99.11
R.K. Macleod*, B.S., P.Eng., President Corporate Secretary
*Directors |
| M.W. Maughan, B.S., P.Geol., C.P.G., V.P., Geoscience |
| B.M. MacKinnon, B.Eng., P.Eng. |
Ref.: 1772
March 5, 2008 |
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Penn West Petroleum Ltd. |
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Re: Consent of Independent Petroleum Consultants
To Whom It May Concern:
Sproule Associates Limited consents to the use of its reports with respect to the reserves data of Canetic Resources Trust and Vault Energy Trust incorporated by reference in Penn West Energy Trust’s: (I) Annual Report (Form 40-F) for the year ended December 31, 2007; (ii) Registration Statement on Form F-3 (Registration No. 333-145296), filed with the Securities and Exchange Commission; (iii) Fourth Quarter 2007 Press Release; (iv) Annual Information Form; and (v) Business Acquisition Report.
| Sincerely, |
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| SPROULE ASSOCIATES LIMITED |
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| /s/ Robert N. Johnson |
| Robert N. Johnson, P. Eng. |
| Vice-President Engineering |
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| [Illegible] |
| for Harry J. Helwerda, P.Eng. |
| Executive Vice-President |
RNJ:HJH:paob
W;\1772\Consent\RNJ 03-13-08.doc
Worldwide Petroleum Consultants
900, 140 Fourth Avenue SW Calgary AB T2P 3N3 Canada | Phone 1-403-294-5500 | Fax: 1-403-294-5590
| Toll-Free: 1-877-777-6135
info@sproule.com | www.Sproule.com