Exhibit 23.6

Data & Consulting Services

Division of Schlumberger Technology Corporation

[Logo]

1310 Commerce Drive

Park Ridge 1

Pittsburgh, PA 15275-1011

Tel: 412-787-5403

Fax: 412-787-2906

CONSENT OF INDEPENDENT PETROLEUM ENGINEERS

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 reports, as of 31 December 2008, 2007 and 2006, setting forth the estimates of revenues from the oil and gas reserves of Quicksilver Resources Inc. and its subsidiaries appearing in the Annual Report on Form 10-K, as amended, of Quicksilver Resources Inc. for the year ended 31 December 2008.

Data & Consulting Services Division of Schlumberger Technology Corporation
By:	/s/ Charles M. Boyer II
	Charles M. Boyer II, P.G., C.P.G., C.C.G.
	Advisor Unconventional Reservoirs

Pittsburgh, PA

10 August 2009