Exhibit 23.5

Data & Consulting Services

Division of Schlumberger Technology Corporation

[Logo]

Two Robinson Plaza, Suite 200

Pittsburgh, PA 15205

Tel: 412-787-5403

Fax: 412-787-2906

CONSENT OF INDEPENDENT PETROLEUM ENGINEERS AND GEOLOGISTS

Data & Consulting Services Division of Schlumberger Technology Corporation consents to the incorporation by reference in this Registration Statement on Form S-8 of information contained in our report, as of 31 December 2009, setting forth the estimates of revenues from the oil and gas reserves of BreitBurn Energy Partners L.P. and its subsidiaries appearing in the Annual Report on Form 10-K of Quicksilver Resources Inc. for the year ended 31 December 2009.

DATA & CONSULTING SERVICES DIVISION OF SCHLUMBERGER TECHNOLOGY CORPORATION
By:	/s/ Charles M. Boyer II
	Charles M. Boyer II, PG, CPG, CCG
	Advisor Unconventional Reservoirs

21 April 2010