Degradable polymer composition and methods of manufacturing and using in downhole tools
AssigneesCNPC USA Corporation, Beijing Huamei, Inc.
InventorsJiaxiang REN, Peng CHENG
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Abstract
A chemical composition for a degradable polymeric material includes an isocyanate terminated polyester, polycarbonate, or polyether prepolymer, including prepolymer units as a main chain with a plurality of isocyanates at ends of the main chain, a catalyst additive, and a cross-linking agent. The composition degrades at a rate and at a delay depending on temperature. The composition is a dissolvable rubber material with a modulus and elongation suitable for a component of a downhole tool.
Claims20
A degradable polymeric composite comprising a reaction product of:
- an isocyanate;
- polyol,
- a degrading catalyst comprising at least one of a group consisting of a metal oxide or a base additive;
- and
- a cross-linking agent so as to reach fracture between about 8 hours and about 3 days, display more than 60% weight change within about 10 days, depending on temperature, and the degradable polymeric composite sealing components maintain over about 8000 psi pressure differential.
A process for forming a degradable polymer composition, the process comprising:
- admixing an isocyanate and a polyol to form a mixture;
- adding a degrading catalyst to the mixture;
- and
- mixing a cross-linking agent so as to reach fracture between 8 hours and 3 days, display more than about 60% weight change within about 10 days, depending on temperature, and the degradable polymeric composite sealing components maintain over about 8000 psi pressure differential.
A degradable polymer composite, comprising a reaction product of:
- an isocyanate terminated polyester, polycarbonate, polyether prepolymer;
- a degrading catalyst being comprised of at least one of a group consisting of a metal oxide or a base additive;
- and
- a cross-linking agent so as to reach fracture between about 8 hours and about 3 days, display more than 60% weight change within about 10 days, and the degradable polymeric composite sealing components maintain over about 8000 psi pressure differential.
Dependencies are inferred from the claim text.