Low temperature hydrocarbon gel II
AssigneeCST Performance Products Corp.
InventorsLarry W. Gatlin, Glen E. Walden, Ernest McMillan, Richard A. Gatlin
Life of this patent
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Abstract
A composition useful for crosslinking phosphate esters in hydrocarbon gels used in formation fracturing performs especially well in cold temperatures, such as temperatures lower than (−)20° C. Methods of making the crosslinking composition and the gel are described; also methods of fracturing subterranean formations. Specific forms of ferric sulfate and ferric ammonium citrate are useful as ingredients of the crosslinking composition.
Claims10
Composition useful for forming gels in liquified propane comprising the reaction product of, by weight, (a) 57-63.5 parts by weight ferric sulfate, (b) 4.37-4.83 parts by weight ferric ammonium citrate (red or brown), (c) 11.4-50 parts by weight citric acid, (d) 12.06-13.33 ammonium hydroxide, and (e) 10.07-11.13 monoisopropanolamine.
Composition useful for forming gels in liquified propane comprising the reaction product of, by weight, (a) 57-63.5 parts by weight ferric sulfate, (b) 4.37-4.83 parts by weight ferric ammonium citrate (red or brown), (c) 11.4-50 parts by weight citric acid, (d) 12.06-13.33 ammonium hydroxide, and (e) 10.07-11.13 monoisopropanolamine, said composition being substantially free of water.
Dependencies are inferred from the claim text.