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US 2020/0347175 A1Published application
Polyurethane cementing wiper plugs
AssigneeBaker Hughes Oilfield Operations LLC
InventorsPing Duan, Anil Sadana
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Abstract
A method for operation in wellbore, the method comprises: pumping a fluid barrier into a wellbore through a tubular, the fluid barrier being operable to separate a cement slurry from a second fluid; the fluid barrier comprising a polyurethane member derived from a polyurethane forming composition comprising a para-phenylene diisocyanate terminated polycarbonate prepolymer and an aromatic diol
Claims20
A method for operation in wellbore, the method comprising:
- pumping a fluid barrier into a wellbore through a tubular, the fluid barrier being operable to separate a cement slurry from a second fluid;
- the fluid barrier comprising a polyurethane member derived from a polyurethane forming composition comprising a para-phenylene diisocyanate terminated polycarbonate prepolymer and an aromatic diol.
A fluid barrier comprising:
- a wiper plug having a core and a polyurethane member disposed on the core;
- and
- a pump downhole plug engaged with the wiper plug, the fluid barrier being operable to separate a cement slurry from a second fluid;
- wherein the polyurethane member is derived from a polyurethane forming composition comprising a para-phenylene diisocyanate terminated polycarbonate prepolymer and an aromatic diol.
1 more element
Dependencies are inferred from the claim text.