A polyurethane quasi prepolymer for proppant consolidation

Details A polyurethane quasi prepolymer for proppant consolidation A polyurethane quasi prepolymer for proppant consolidation

C - Chemistry, Metallurgy

07

C

402/157, 260/455

C07C 271/28 (2006.01) C07C 271/64 (2006.01) C08G 18/06 (2006.01) C08G 18/08 (2006.01) C08G 18/30 (2006.01) C08G 18/76 (2006.01) C08G 18/80 (2006.01) C09K 8/565 (2006.01)

Patent

CA 2005548

A POLYURETHANE QUASI PREPOLYMER FOR PROPPANT CONSOLIDATION ABSTRACT A method of preparing a consolidating agent in the form of a polyurethane prepolymer for consolidating a proppant in a subterranean formation about a well employing the improvement characterized by a quasi prepolymer formed by reacting a diol with a stoichiometric excess of isomeric methylene diphenylene diisocyanate and a diluent; and allowing the reactants to stand for a period in excess of two hours at 25 degrees C., whereby to form oligmers of polyurethane chains. The method enables consolidating a proppant in fractures by a slow polymerization process, whereby the curing agent can be added at the same time the proppant is placed. Also disclosed are specific examples of diluents and curing agents.

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