Methods of forming a degradable component

Patent metadata

Field	Value
Publication number	US-10280359-B2
Application number	US-201715855026-A
Country	US
Kind code	B2
Filing date	Dec 27, 2017
Priority date	Oct 28, 2014
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

Methods of using a component in a subterranean wellbore include positioning a component including a degradable thermoset polymer material in a wellbore location, obstructing flow with the component, exposing the component to an acidic solution to degrade the selectively degradable thermoset polymer material and to remove the component from the wellbore location, and flowing a fluid through the wellbore location where the component was positioned. Methods of forming a component of a wellbore system include forming at least a portion of the component to comprise a degradable thermoset polymer material. Wellbore systems include at least one component including a selectively degradable thermoset polymer material. The selectively degradable thermoset polymer material may be a polyhexahydrotriazine (“PHT”) material.

First claim

What is claimed is:

1. A method of forming a component of a wellbore system, the method comprising:
forming at least a portion of the component of the wellbore system to comprise a degradable thermoset polymer material, comprising:
combining paraformaldehyde with a diamine material in a solvent; and
curing the combination of the paraformaldehyde, diamine material, and solvent at an elevated temperature of at least about 50° C. to form a polyhexahydrotriazine material, the polyhexahydrotriazine material being mechanically stable when exposed to wellbore temperatures in a range between 50° C. and 220° C., inclusive, and at wellbore fluid pressures equal to or greater than about 3,000 psi.

2. The method of claim 1 , wherein combining paraformaldehyde with a diamine material in a solvent comprises combining the paraformaldehyde with the diamine material in a solvent comprising N-methylpyrrolidone.

3. The method of claim 1 , wherein forming at least a portion of the component comprises forming the at least a portion of the component within a mold.

4. The method of claim 1 , wherein forming at least a portion of the component further comprises adding at least one filler material to the combination of the paraformaldehyde, diamine material, and solvent, the at least one filler material selected from the group consisting of graphene, graphene oxide, graphite, carbon nanotubes, carbon fibers, nylon particles, controlled electrolytic metallic particles, molybdenum sulfide, water-soluble poly(vinyl alcohol) fibers, and active metal particles or fibers.

5. The method of claim 1 , wherein forming at least a portion of the component of the wellbore system to comprise a degradable thermoset polymer material comprises substantially fully forming the component of the degradable thermoset polymer material.

6. The method of claim 1 , wherein combining paraformaldehyde with a diamine material in a solvent comprises combining the paraformaldehyde with the diamine material in a solvent comprising at least one of dimethylformamide, acetone, dimethyl sulfoxide, and acetonitrile.

7. The method of claim 1 , wherein combining paraformaldehyde with a diamine material in a solvent comprises combining the paraformaldehyde with the diamine material selected from the group consisting of 4,4′-oxydianiline, 4,4′-(9-fluorenylidene)dianiline, bis-(3-aminophenyl)-methanone, 4,4′-(1,3-phenylenedioxy)dianiline, 4,4′-(4,4′-isopropylidenediphenyl-1,1′-diyldioxy)dianiline, and 4,4′-methylenedianiline in the solvent.

8. The method of claim 1 , wherein combining paraformaldehyde with a diamine material in a solvent comprises dissolving the paraformaldehyde and the diamine material in the solvent.

9. The method of claim 1 , wherein combining paraformaldehyde with a diamine material in a solvent comprises combining paraformaldehyde with the diamine material in a molar ratio of between about 1:2 and about 1:10.

10. The method of claim 1 , wherein forming at least a portion of the component of the wellbore system to comprise a degradable thermoset polymer material comprises forming a drop ball of the wellbore system to comprise the degradable thermoset polymer material.

11. The method of claim 1 , wherein forming at least a portion of the component of the wellbore system to comprise a degradable thermoset polymer material comprises forming at least a portion of at least one component selected from the group consisting of a drop ball, a drop ball seat, an isolation plug, a valve plug, an expandable reamer, a stabilizer, a perforation gun body, and a gravel-pack screen to comprise the degradable thermoset polymer material.

12. The method of claim 1 , wherein the degradable thermoset polymer material is selectively degradable by exposure to an acidic solution having a pH of less than about 2.0.

13. The method of claim 1 , wherein curing the combination of the paraformaldehyde, diamine material, and solvent at an elevated temperature of at least about 50° C. to form a polyhexahydrotriazine material comprises heating the combination of the paraformaldehyde, diamine material, and solvent at a temperature of about 50° C. for about one hour, increasing the temperature of the combination of the paraformaldehyde, diamine material, and solvent from a temperature of about 50° C. to about 200° C. for about one hour, and then holding the temperature of the combination of the paraformaldehyde, diamine material, and solvent at about 200° C. for about one hour.

14. A method of forming a component of a wellbore system, the method comprising:
forming at least a portion of the component of the wellbore system to comprise a selectively degradable thermoset polymer material, the selectively degradable thermoset polymer material comprising polyhexahydrotriazine material, the polyhexahydrotriazine material being mechanically stable when exposed to wellbore temperatures in a range between 50° C. and 220° C., inclusive, and at wellbore fluid pressures equal to or greater than about 3,000 psi.

15. The method of claim 14 , wherein forming at least a portion of the component further comprises adding at least one filler material to the combination of the paraformaldehyde, diamine material, and solvent, the at least one filler material selected from the group consisting of graphene, graphene oxide, graphite, carbon nanotubes, carbon fibers, nylon particles, controlled electrolytic metallic particles, molybdenum sulfide, water-soluble poly(vinyl alcohol) fibers, and active metal particles or fibers.

16. The method of claim 14 , wherein forming at least a portion of the component of the wellbore system to comprise a selectively degradable thermoset polymer material comprises:
combining paraformaldehyde with a diamine material in a solvent; and
curing the combination of the paraformaldehyde, diamine material, and solvent at an elevated temperature of at least about 50° C. to form the polyhexahydrotriazine material.

17. The method of claim 14 , wherein forming at least a portion of the component of the wellbore system to comprise a degradable thermoset polymer material comprises forming at least a portion of at least one component selected from the group consisting of a drop ball, a drop ball seat, an isolation plug, a valve plug, an expandable reamer, a stabilizer, a perforation gun body, and a gravel-pack screen to comprise the degradable thermoset polymer material.

18. The method of claim 14 , wherein forming at least a portion of the component of the wellbore system to comprise a degradable thermoset polymer material comprises substantially fully forming the component of the wellbore system to comprise the degradable thermoset polymer material.

19. The method of claim 14 , wherein the selectively degradable thermoset polymer material is selectively degradable by exposure to an acidic solution having a pH of less than about 2.0.

20. The method of claim 14 , wherein forming at least a portion of the component of the wellbore system to comprise a selectively degradable thermoset polymer material comprises substantially fully forming the component of the selectively degradable thermoset polymer material.

Assignees

• Baker Hughes Inc

Inventors

• Sadana Anil K
• Potts Jeffrey R

Classifications

• E21B31/002

  Destroying the objects to be fished, e.g. by explosive means · CPC title

• C09K2208/08

  Fiber-containing well treatment fluids · CPC title

• C09K8/508 Primary

  macromolecular compounds {(C09K8/512 takes precedence)} · CPC title

• E21B33/12

  Packers; Plugs (used for cementing E21B33/134, E21B33/16) · CPC title

• C09K2208/10

  Nanoparticle-containing well treatment fluids · CPC title