Schlumberger Technology Corporation

Ramchandra M Reddy

J Ernest Brown

Kevin W England

Jerald J Hinkel

A well treatment fluid composition that comprises a carrier fluid and an amphoteric surfactant, and optionally a viscosifying agent and proppant, is well suited for use in fracturing coal beds to stimulate methane production. The composition preferably is a foam that comprises a gas such as nitrogen or air. Preferably, the surfactant has the formulaR&#x2014;NH&#x2014;(CH)&#x2014;C(O)OXwherein R is a saturated or unsaturated alkyl group having from 6-20 carbon atoms, n is from 2-6, and X is hydrogen or a salt forming cation.

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Houston, TX, United States of America

Ramchandra M Reddy