Use of elastomers to produce gels for treating a wellbore
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United States of America Patent
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Jul 11, 2017
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Dec 13, 2010
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Dec 11, 2009
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Abstract
A method of treating an earthen formation that includes introducing a first amount of a first blocked isocyanate in a liquid phase into the earthen formation; introducing a second amount of a second blocked isocyanate in a liquid phase into the earthen formation; the second blocked isocyanate group having a lower unblocking temperature than the first blocked isocyanate group; introducing at least one active hydrogen compound into the earthen formation; and contacting the first and second blocked isocyanates and the active hydrogen compound to form an elastomeric gel. The combination of two blocked isocyanates provides a synergistic effect so that the curing time can be optimised in a manner unexpected from the properties of the individual blocked isocyanates.
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