Exhibit 99.12

CONSENT OF INDEPENDENT PETROLEUM ENGINEERS

We hereby consent to the use and reference to our name and reports evaluating a portion of Cenovus Energy Inc.’s and EnCana Corporation’s petroleum and natural gas reserves as of December 31, 2008, and the information derived from our reports, as described or incorporated by reference in Cenovus Energy Inc.’s Registration Statement on Form 40-F, filed with the United States Securities and Exchange Commission pursuant to the Securities Exchange Act of 1934, as amended.

MCDANIEL & ASSOCIATES CONSULTANTS LTD.

By: /s/ P. A. Welch
                                                            
P. A. Welch, P. Eng.
President & Managing Director

Calgary, Alberta
October 29, 2009

2200, Bow Valley Square 3, 255 - 5 Avenue SW, Calgary AB T2P 3G6 Tel: (403) 262-5506 Fax: (403) 233-2744 www.mcdan.com