Amy M Maxin

US Patent:

20190203097, Jul 4, 2019

Filed:

Jul 17, 2018

Appl. No.:

16/037400

Inventors:

- Pittsburgh PA, US
Michael Jeffries - Follansbee WV, US
Amy Maxin - McKees Rocks PA, US

International Classification:

C09K 8/44
C09K 8/508
C09K 8/035
C09K 8/54
C08G 18/73
C08G 18/48
C08G 18/22
C08G 18/18
C08G 18/16
E21B 33/138

Abstract:

The present invention provides methods and materials for treating an oil and gas well by introducing a polyurethane composition into the well to plug perforations and other non-productive zones of an oil and gas well to greatly reduce or prevent the ingress of formation water during production. These methods include: (a) preparing a polyurethane composition by mixing a polyol-containing component and a polyisocyanate-containing component; and (b) introducing the polyurethane composition into the well. The polyol-containing component includes a polymeric polyol having a viscosity at 25° C. of no more than 1000 mPa·s and the isocyanate-containing component includes an unblocked (cyclo)aliphatic polyisocyanate polymer, optionally including allophanate groups, and having a viscosity at 25° C. of no more than 1000 mPa·s and at least 99% solids content.