**Exhibit 99.11**

 
|  | **R.K. Macleod*,**B.S., P.Eng., *President***H.J. Helwerda*,**B.Sc., P.Eng., *Executive  V.P.*******J.L. Chipperfield*,**B.Sc., P.Geol., *Senior V.P.***R.N. Johnson*,**B.Sc.,  P.Eng., *V.P., Engineering***D.W.C. Ho*,**B.A.Sc., P.Eng., *V.P., Engineering***G.D. Robinson*,**B.Sc.,  P.Eng., *V.P., Engineering***D.J.**Carsted*,**CD, B.Sc., P.Geol., *V.P., Geoscience***K.P. McDonald,**B.Comm.,  C.A., *Controller;*

*Corporate  Secretary*

* *

* *

* *

* *

* *

* *

* *

* *

**Directors* |   | **M.W. Maughan,**B.S., P.Geol., C.P.G., *V.P., Geoscience***C.M.F. Galas,**Ph.D.,  P.Eng., *Manager, Reservoir Studies***R. Gerritse, B.Sc.,***Manager, Systems***B.F. Jose,**M.Sc.,  P.Geoph., *Manager, Geoscience***C.P. Six,**B.Sc.,  P,Eng., *Manager, Engineering***D.W. Woods,**B.Ed.,  B.Sc., P.Eng., *Manager, Engineering***D.R. Bates,**B.Sc., P.Eng.**G.R. Finnis,**B.Sc., P.Eng.**H.J. Firla,** B.S., P.Eng.**K. Ghaffari,**M.Sc., P.Eng.**J. Hanko,**B.Sc., P.Geol.**P.B. Jung,** B.S., P.Eng.**A. Kovaltchouk,**M.Sc., P.Geol. |   | **B.M. MacKinnon,** B.Eng., P.Eng.**M.J. O’Blenes,**M.Sc., P.Eng.**S.W. Pennell,**B.Sc. Eng.**L.M. Precul,**M.Sc., P.Eng.**G.I. Sanden,**B.Sc., P.Eng.**M.W. Sargent,**Ph.D., P.Geol.**V.V. Savenkov,**M.Sc., MBA,  P.Eng.**P.C. Sidey,** B.Sc., P.Eng.**N.T. Stewart,**B.A.Sc., P.Eng.**G.D. Strother-Stewart,** B.Sc., P.Geol.**W.J. Waddell,**B.Sc., P.Geol.**R.R. Warholm,**B.Sc., P,Eng.**T.K. Wong,**B.Sc., P.Geol. |
|--|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

 

Ref.: 1772

 
| March  5, 2008                                                          |   |
|-------------------------------------------------------------------------|--------|
|                                                                    |   |
| Penn West Petroleum Ltd.  2200, 425 First Street SW  Calgary AB T2P 3L8 |   |

** **

**Re:   Consentof Independent Petroleum Consultants**

 

To Whom It May Concern:

 

Sproule Associates Limited consents to theuse of its reports with respect to the reserves data of Canetic Resources Trustand 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 withthe Securities and Exchange Commission; (iii) Fourth Quarter 2007 PressRelease; (iv) Annual Information Form; and (v) Business Acquisition Report.

 
|   | Sincerely,                      |
|--------|---------------------------------|
|   |                            |
|   | **SPROULE  ASSOCIATES LIMITED** |
|   | ** **                      |
|   | ** **                      |
|   | /s/ Robert  N. Johnson          |
|   | Robert N.  Johnson, P. Eng.     |
|   | Vice-President  Engineering     |
|   |                            |
|   |                            |
|   | [Illegible]                     |
|   | for Harry J.  Helwerda, P.Eng.  |
|   | Executive  Vice-President       |

 

RNJ:HJH:paob

W;\1772\Consent\RNJ03-13-08.doc

 

***Worldwide Petroleum Consultants***

 

900, 140 Fourth Avenue SW Calgary AB T2P 3N3 Canada | Phone1-403-294-5500 | Fax: 1-403-294-5590| Toll-Free: 1-877-777-6135

info@sproule.com | www.Sproule.com

 

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