Proppant coatings and methods of making

Patent metadata

Field	Value
Publication number	US-11851614-B2
Application number	US-202016905175-A
Country	US
Kind code	B2
Filing date	Jun 18, 2020
Priority date	Jun 18, 2020
Publication date	Dec 26, 2023
Grant date	Dec 26, 2023

Abstract

A coated proppant having a proppant particle, an intermediate cross-linked terpolymer layer encapsulating the proppant particle, and an outer resin layer encapsulating the intermediate cross-linked terpolymer layer. The proppant particle is selected from sand, ceramic, glass, and combinations thereof. The intermediate cross-linked terpolymer layer includes styrene, methyl methacrylate, and divinyl benzene. The outer resin layer includes a cured epoxy resin formed from an epoxy resin and a curing agent.

First claim

What is claimed is:

1. A coated proppant comprising:
a proppant particle;
an intermediate cross-linked terpolymer layer encapsulating the proppant particle, wherein the intermediate cross-linked terpolymer layer comprises
a copolymer of a first monomer comprising a cis- or trans-ethylene substituted aromatic organic compound and a second monomer comprising an alkyl acrylate, and
a cross-linking agent incorporated into the copolymer backbone to form the terpolymer; and

an outer resin layer encapsulating the intermediate cross-linked terpolymer layer, wherein the outer resin layer comprises a cured epoxy resin and graphene.

2. The coated proppant of claim 1 , wherein the proppant particle is selected from the group consisting of oxides, silicates, sand, ceramic, resin, epoxy, plastic, mineral, glass, and combinations thereof.

3. The coated proppant of claim 1 , wherein the proppant particle is selected from the group consisting of sand, ceramic, glass, and combinations thereof.

4. The coated proppant of claim 1 , wherein the first monomer is styrene.

5. The coated proppant of claim 1 , wherein the second monomer is methyl methacrylate.

6. The coated proppant of claim 1 , wherein the first monomer is styrene and the second monomer is methyl methacrylate.

7. The coated proppant of claim 1 , wherein the first monomer is present in the copolymer in an amount from 10.0 wt. % to 90.0 wt. %, and the second monomer is present in the copolymer in an amount from 10.0 wt. % to 90.0 wt. %.

8. The coated proppant of claim 7 , wherein the first monomer is present in the copolymer in an amount from 40.0 wt. % to 60.0 wt. %, and the second monomer is present in the copolymer in an amount from 40.0 wt. % to 60.0 wt. %.

9. The coated proppant of claim 1 , wherein the cross-linking agent is selected from the group consisting of divinyl benzene, vinylpyridine, bis(vinylphenyl) ethane, bis(vinylbenzyloxy) hexane, and combinations thereof.

10. The coated proppant of claim 9 , wherein the cross-linking agent comprises divinyl benzene.

11. The coated proppant of claim 1 , wherein the cross-linking agent is present as a super addition relative to the copolymer in an amount from 0.5 wt. % to 30.0 wt. % by weight of the copolymer.

12. The coated proppant of claim 1 , wherein the cross-linking agent is present as a super addition relative to the copolymer in an amount from 1.0 wt. % to 15.0 wt. % by weight of the copolymer.

13. The coated proppant of claim 1 , wherein the cured epoxy resin is formed from an epoxy resin and a curing agent.

14. The coated proppant of claim 13 , wherein the epoxy resin has the following general formula:

wherein R and R′ are selected from the group consisting of a six-membered ring, a polyhydroxyphenol, a polybasic acid, a polyol, and combinations thereof.

15. The coated proppant of claim 13 , wherein the curing agent is selected from the group consisting of aliphatic polyamines and their derivatives, modified aliphatic amines, aromatic amines, and combinations thereof.

16. The coated proppant of claim 1 , wherein the coated proppant produces fine production at a load of 12000 psi that is from 2.0% to 10.0%.

17. The coated proppant of claim 1 , wherein the coated proppant produces fine production at a load of 10000 psi that is from 0.5% to 5.0%.

18. The coated proppant of claim 1 , wherein the coated proppant has an elastic modulus from 4.0 GPa to 7.0 GPa.

19. The coated proppant of claim 1 , wherein the coated proppant has a hardness from 0.10 GPa to 0.40 GPa.

20. The coated proppant of claim 1 , wherein
the proppant particle is selected from the group consisting of sand, ceramic, glass, and combinations thereof;
the intermediate cross-linked terpolymer layer comprises styrene as the first monomer, methyl methacrylate as the second monomer, and divinyl benzene as the crosslinking agent; and
the outer resin layer comprises a cured epoxy resin formed from an epoxy resin and a curing agent, wherein
the epoxy resin has the following general formula:

wherein R and R′ are selected from the group consisting of a part of a six-membered ring, a polyhydroxyphenol, a polybasic acid, a polyol, and combinations thereof, and
the curing agent is selected from the group consisting of aliphatic polyamines and their derivatives, modified aliphatic amines, aromatic amines, and combinations thereof.

Assignees

• Saudi Arabian Oil Co
• Alfaisal Univ

Inventors

• Li Wengang
• Alsharaeh Edreese
• Krishnan Mohan Raj

Classifications

• C09K8/805 Primary

  Coated proppants · CPC title

• C08F12/08

  Styrene · CPC title

• C08F20/06

  Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof · CPC title

• C08G59/5006

  aliphatic · CPC title

• C08G59/5033

  aromatic · CPC title