Exhibit 23.7 [Ryder Scott Company letterhead] PETROLEUM CONSULTANT'S CONSENT We consent to incorporation by reference in the Registration Statement on Form S-8 of Devon Energy Corporation, the reference to our appraisal report for Devon Energy Corporation as of December 31, 1999, which appears in the December 31, 1999 annual report on Form 10-K of Devon Energy Corporation. RYDER SCOTT COMPANY, L.P. Ryder Scott Company, L.P. Houston, Texas October 6, 2000