Low temperature hydrocarbon gel II
AssigneeConlen Surfactant Technology, Inc.
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.
Claims19
1-20. (canceled)
Method of making an iron crosslinker for use in hydrocarbon gel formation at temperatures lower than −20° C. comprising (1) forming a substantially uniform mixture of ingredients, in active parts by weight, comprising (a) 30 to 33.6 ferric sulfate containing 0.8% to 1.3% by weight sulfuric acid, (b) 10 to 50 citric acid, (c) 8.9 to 10 monoisopropanolamine, and (d) 3.1 to 3.6 ammonium hydroxide, (2) dissolving (e) 3.8 to 4.5 parts by weight ferric ammonium citrate (red or brown), into said mixture and (3) mixing (f) 4.25 to 4.8 parts by weight sodium cumene sulfonate into said mixture, whereby an exothermic reaction is effected in said mixture.
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,
Dependencies are inferred from the claim text.