Polyurethane quasi prepolymer for proppant consolidation
US4920192A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 31, 1989 |
| Grant date | Apr 24, 1990 |
| Priority date | — |
| Expiry date | Jan 31, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/565
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.