Quicksilver Resources and Eni Form Strategic Alliance to Develop Unconventional Natural Gas Resources

FORT WORTH, TX, May 18 (MARKET WIRE) --
Quicksilver Resources Inc. (NYSE: KWK) announced today that it has formed
a strategic alliance with major integrated energy company Eni (NYSE: E)
for acquisition, development and exploitation of unconventional natural
gas resources in an area covering approximately 270,000 acres surrounding
Quicksilver's Alliance properties in the Fort Worth Basin. The parties
have executed a definitive purchase agreement whereby Eni will acquire
27.5% of Quicksilver's Alliance leasehold interests for $280 million in
cash. Quicksilver will be the operator of the alliance properties. The
alliance will foresee a mutual technical exchange between the two
companies, particularly in drilling and completion technologies and
geophysics.

"We are excited to join forces with Eni for the development of these
properties," said Glenn Darden, Quicksilver president and chief executive
officer. "This transaction, which represents just five percent of our
company's total proved reserves at year-end 2008, is the initial step to
de-lever our balance sheet while establishing a framework that provides
meaningful opportunities to capitalize on Quicksilver's expertise in the
identification, acquisition and development of shale gas resources. Our
agreement with Eni will enable us to expand our footprint beyond the
existing Alliance acreage and could lead to additional opportunities in
unconventional plays outside of this basin."

Quicksilver's existing Alliance natural gas leasehold covers approximately
13,000 net acres in Denton and Tarrant counties, Texas and is currently
producing approximately 60 million cubic feet of natural gas per day. The
transaction does not include Quicksilver's midstream gathering
infrastructure or any of its existing leasehold beyond the Alliance
properties.

The transaction, which includes the sale of 131 billion cubic feet (Bcf)
of proved reserves and 96 Bcf of probable and possible resources, is
effective as of April 1, 2009 and is expected to close on or before June
15, 2009. Net proceeds from the transaction will be used to repay
Quicksilver's existing indebtedness.

Merrill Lynch & Co. acted as Quicksilver's financial advisor in connection
with the transaction.

About Quicksilver Resources

Fort Worth, Texas-based Quicksilver Resources is a natural gas and crude
oil exploration and production company engaged in the development and
acquisition of long-lived, unconventional natural gas reserves, including
coalbed methane, shale gas, and tight sands gas in North America. The
company has U.S. offices in Fort Worth, Texas; Glen Rose, Texas and Cut
Bank, Montana. Quicksilver's Canadian subsidiary, Quicksilver Resources
Canada Inc., is headquartered in Calgary, Alberta. For more information
about Quicksilver Resources, visit www.qrinc.com.

Forward-Looking Statements

The statements in this press release regarding future events, occurrences,
circumstances, activities, performance, outcomes and results are
forward-looking statements within the meaning of the Private Securities
Litigation Reform Act of 1995. Although these statements reflect the
current views, assumptions and expectations of Quicksilver Resources'
management, the matters addressed herein are subject to numerous risks and
uncertainties, which could cause actual activities, performance, outcomes
and results to differ materially from those indicated. Factors that could
result in such differences or otherwise materially affect Quicksilver
Resources' financial condition, results of operations and cash flows
include: changes in general economic conditions; fluctuations in natural
gas, natural gas liquids and crude oil prices; failure or delays in
achieving expected production from exploration and development projects;
uncertainties inherent in estimates of natural gas, natural gas liquids
and crude oil reserves and predicting natural gas, natural gas liquids and
crude oil reservoir performance; effects of hedging natural gas, natural
gas liquids and crude oil prices; fluctuations in the value of certain of
our assets and liabilities; competitive conditions in our industry;
actions taken or non-performance by third parties, including suppliers,
contractors, operators, processors, transporters, customers and
counterparties; changes in the availability and cost of capital; delays in
obtaining oilfield equipment and increases in drilling and other service
costs; operating hazards, natural disasters, weather-related delays,
casualty losses and other matters beyond our control; the effects of
existing and future laws and governmental regulations; and the effects of
existing or future litigation; as well as, other factors disclosed in
Quicksilver Resources' filings with the Securities and Exchange
Commission. Except as required by law, we do not intend to update or
revise any forward-looking statements, whether as a result of new
information, future events, or otherwise.

KWK 09-06

Investor Contact:
Rick Buterbaugh
(817) 665-4835

Media Contact:
Deborah Buks
Ward Creative Communications
(713) 869-0707

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