Gelling organic liquids

Details Gelling organic liquids Gelling organic liquids

E - Fixed Constructions

21

B

31/28

E21B 43/25 (2006.01) C07F 9/09 (2006.01) C09K 8/64 (2006.01) C09K 8/80 (2006.01) E21B 43/267 (2006.01) F02B 3/06 (2006.01)

Patent

CA 1247355

ABSTRACT OF THE INVENTION A method of producing a gel of an organic liquid, using a metal phosphate ester in which all of the reagents are substantially free of water and pH-affecting substances. The gel is particularly useful in fracturing subterranean formations by entraining a solid particulate proppant therein and pumping the resultant mixture into the subterranean rock formation at sufficient pressure to fracture the formation. The organic liquid is preferably a hydrocarbon such as diesel or crude oil, and the metal phosphate ester is preferably an aluminum phosphate diester. The metal phosphate diester may be prepared by the reaction of a triester with P2O5 to produce a polyphosphate, which is then reacted with an alcohol to produce a phosphate diester. The latter diester is then added to the organic liquid along with a non-aqueous source of aluminum, such as aluminum isopropoxide in diesel, to produce the metal phosphate diester. The conditions in the foregoing two reaction steps are controlled to provide a gel with good viscosity versus temperature and time characteristics.

499097

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