Molded articles of modified polyglycolic acid for degradable downhole tools application

Patent metadata

Field	Value
Publication number	US-12448863-B2
Application number	US-202318497632-A
Country	US
Kind code	B2
Filing date	Oct 30, 2023
Priority date	Oct 30, 2023
Publication date	Oct 21, 2025
Grant date	Oct 21, 2025

Abstract

The patent application discloses a degradable downhole tool member for hydrocarbon resource recovery. The downhole tool member comprises a shaped body comprising a degradable polymer matrix, wherein the downhole tool member, when held in downhole fluid at about 80° C., has an initial mass loss about 14% for a holding period of about 2 days in a pressure holding test.

First claim

We claim:

1. A downhole tool member for hydrocarbon resource recovery, comprising:
a shaped body comprising a degradable polymer matrix, wherein the degradable polymer matrix comprises 50 to 98 mass % of a polyglycolic acid (PGA), from 50 to 2 mass % of a polylactic acid (PLA) with about 1%-about 3% compatibilizer,
wherein the downhole tool member, when held in downhole fluid at about 80° C., has an initial mass loss of about 14% for a holding period of about 2 days in a pressure holding test, wherein the downhole fluid comprises aqueous solution.

2. The downhole tool member according to claim 1 , wherein the mass loss is about 50% for a holding period of about 7 days in the pressure holding test.

3. The downhole tool member according to claim 1 , wherein the polyglycolic acid comprises polyglycolic acid resin.

4. The downhole tool member according to claim 1 , wherein the downhole tool member holds pressure ranging from about 6500 psi to about 10000 psi at about 93° C. for up to about 24 hours in the pressure holding test.

5. The downhole tool member according to claim 1 , wherein the aqueous solution comprises KCl solution.

6. The downhole tool member according to claim 1 , wherein the degradable polymer comprises a copolymer of two or more aliphatic polyesters copolymer.

7. The downhole tool member according to claim 6 , wherein the copolymer comprises poly(lactic acid-co-glycolic acid) (PLGA).

8. The downhole tool member according to claim 7 , wherein the copolymer poly(lactic acid-co-glycolic acid) (PLGA) ranges from about 0 part to about 6 parts (considering polyglycolic acid (PGA) and polylactic acid (PLA) as about 100 parts, where PLA ranges from about 1 part to about 30 parts.

9. A downhole tool member for hydrocarbon resource recovery, comprising:
a shaped body comprising a degradable polymer matrix, wherein the degradable polymer matrix comprises 50 to 98 mass % of a polyglycolic acid (PGA), from 50 to 2 mass % of a polylactic acid (PLA) with about 1%-about 3% compatibilizer,
wherein the downhole tool member hold pressure in a downhole fluid ranging from 6500 psi to 10000 psi at about 93° C. for up to about 24 hours in a pressure holding test, wherein the downhole fluid comprises aqueous solution.

10. The downhole tool member according to claim 9 , wherein the downhole tool member, when held in downhole fluid: at 80° C., has an initial mass loss about 14% for a holding period of about 2 days in the pressure holding test.

11. The downhole tool member according to claim 9 , wherein the polyglycolic acid comprises polyglycolic acid resin.

12. The downhole tool member according to claim 9 , wherein the polymer comprises a copolymer of two or more aliphatic polyesters.

13. The downhole tool member according to claim 12 , wherein the copolymer comprises poly(lactic acid-co-glycolic acid) (PLGA).

14. The downhole tool member according to claim 9 , wherein the downhole tool member holds pressure ranging from about 6500 psi to about 10000 psi at about 93° C. for up to about 24 hours in a pressure holding test.

15. A downhole tool member for hydrocarbon resource recovery, comprising:
a shaped body comprising a degradable polymer matrix, wherein the degradable polymer matrix comprises 50 to 98 mass % of a polyglycolic acid (PGA), from 50 to 2 mass % of a polylactic acid (PLA) with about 1%-about 3% compatibilizer,
wherein the downhole tool member, when held in downhole fluid at about 80° C., has a mass loss of about 50% for a holding period of about 7 days in a pressure holding test, wherein the downhole fluid comprises aqueous solution.

16. The downhole tool member according to claim 15 , wherein the polymer comprises copolymer, wherein the copolymer comprises poly(lactic acid-co-glycolic acid) (PLGA).

17. The downhole tool member according to claim 16 , wherein the downhole tool member, when held in downhole fluid at about 80° C., has an initial mass loss about 14% for a holding period of about 2 days in the pressure holding test.

18. The downhole tool member according to claim 16 , wherein the downhole tool member, when held in downhole fluid at about 80° C., has a mass loss about 50% for a holding period of about 7 days in the pressure holding test.

Assignees

• Cnpc Usa Corp
• Beijing Huamei Inc
• China Nat Petroleum Corp

Inventors

• Xing Peixiang
• Yuan Min (Mark)
• Ren Jiaxiang (Jason)
• Cheng Peng
• Liu Yu
• Yang Zhenzhou

Classifications

• C08L67/04

  Polyesters derived from hydroxycarboxylic acids, e.g. lactones (C08L67/06 takes precedence) · CPC title

• E21B2200/08

  Down-hole devices using materials which decompose under well-bore conditions · CPC title

• E21B33/13 Primary

  Methods or devices for cementing, for plugging holes, crevices or the like · CPC title