Polyurethane quasi prepolymer for proppant consolidation

Details Polyurethane quasi prepolymer for proppant consolidation Polyurethane quasi prepolymer for proppant consolidation

1989-01-31

1990-04-24

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

166295, 528 52, 528 55, 528 86, C08G 1875

Patent

active

049201921

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.

REFERENCES:
patent: 3851479 (1974-12-01), Argabright et al.
patent: 4114382 (1978-09-01), Kubens et al.
patent: 4709002 (1987-11-01), Younes
patent: 4731427 (1988-03-01), Younes

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