Formulation and setup method of in-situ dissolvable plug

Patent metadata

Field	Value
Publication number	US-2025043169-A1
Application number	US-202318359432-A
Country	US
Kind code	A1
Filing date	Jul 26, 2023
Priority date	Jul 26, 2023
Publication date	Feb 6, 2025
Grant date	—

Abstract

The patent application discloses a plug useable for isolating sections of a wellbore. The in-situ dissolvable plug comprises a cylindrical body having a backup piece at least at one end of the cylindrical body, a tube and a cylindrical body. The tube may extend through the cylindrical body and backup piece. The cylindrical body may be made of dissolvable material comprising an external surface, and an inner bore surface formed around the tube. The cylindrical body is soft, moldable, and expandable vertical to the tube to form an in-situ plug at downhole.

First claim

1 . An in-situ dissolvable plug useable for isolating sections of a wellbore, comprising:
a cylindrical body having a backup piece at least at one end of the cylindrical body; and a tube extends through the cylindrical body and backup piece; wherein the cylindrical body is made of dissolvable curable material comprising an external surface, and an inner bore surface formed around the tube, wherein the cylindrical body is soft, moldable, and expandable in a direction from a starting point of the inner bore surface to the external surface that is perpendicular to the tube outer surface and in a direction away from the tube, wherein the backup piece is movable toward to the cylindrical body to squeeze the dissolvable curable material to expand and cure in-situ from the inner bore surface to the external surface.

2 . The in-situ dissolvable plug of claim 1 , wherein backup piece is expandable in a direction from a starting point of the inner bore surface to the external surface that is perpendicular to the tube outer surface and in a direction away from the tube to the tube upon a trigger action.

3 . The in-situ dissolvable plug of claim 1 , wherein the dissolvable material comprises polymer material.

4 . The in-situ dissolvable plug of claim 3 , wherein the polymer materials comprise a reaction product of an epoxy resin mixture, a cross-linker, a degradation catalyst, and a fiber enhancement.

5 . The in-situ dissolvable plug of claim 4 , wherein the degradation catalyst is a controlled release catalyst.

6 . The in-situ dissolvable plug of claim 4 , wherein the degradation catalyst is capped by a shell.

7 . The in-situ dissolvable plug of claim 1 , wherein the plug comprises a first axis, wherein the tube has a second axis, wherein the first axis and the second axis coincide.

8 . An in-situ manufactured plug for isolating zones in a well comprising:
a distal end backup piece; a proximate end backup piece; and a cylindrical body between the distal end backup piece and the proximate end backup piece, wherein the cylindrical body is made of dissolvable material comprising an external surface, wherein the distal end backup piece and the proximate end backup piece are expandable vertically and move horizontally so as to squeeze the dissolvable material to expand vertically to form an in-situ plug.

9 . The in-situ manufactured plug of claim 8 , further comprises a tube connected through the proximate end backup piece, the distal end backup piece, and the cylindrical body.

10 . The in-situ manufactured plug of claim 8 , wherein the cylindrical member made of polymer materials.

11 . The in-situ manufactured plug of claim 9 , wherein the plug comprises a first axis, wherein the tube has a second axis, wherein the first axis and the second axis coincide.

12 . The in-situ manufactured plug of claim 10 , wherein the polymer materials comprise a reaction product of an epoxy resin mixture, a cross-linker, a degradation catalyst, and a fiber enhancement.

13 . The in-situ manufactured plug of claim 12 , wherein the degradation catalyst is capped by a shell.

14 . The in-situ manufactured plug of claim 12 , wherein the degradation catalyst is a controlled release catalyst.

15 . A method of forming an in-situ plug, comprising:
admixing an epoxy, a degradation catalyst, and a cross-linker to form a curable composition; mixing with fibers to make raw materials; and B staging the raw materials at low temperature to achieve high viscosity; deforming under a compressive load to form a shape of deformed casing; and starting another cross-linking reaction to form a fiber enhanced thermoset composite plug in-situ.

16 . The method of claim 15 further comprising adding viscosity enhancer or thicker agents to increase viscosity.

17 . The method of claim 16 wherein viscosity enhancer or thicker agent includes at least one of ZnO, Al 2 O 3 , ZrO 2 , clay, fume silica, TiO 2 powder.

18 . The method of claim 15 , wherein the cross-linker comprises a high temperature cross-linker and a low temperature cross-linker.

19 . The method of claim 15 , wherein the cross-linker comprises a cycloaliphatic anhydride.

20 . The method of claim 15 , wherein the cross-linker works at high temperature.

Assignees

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

Inventors

• Zhao Lei
• Ren Jiaxiang (Jason)
• Yue Jianpeng
• Cheng Peng

Classifications

• C04B40/0092

  Temporary binders, mortars or concrete, i.e. materials intended to be destroyed or removed after hardening, e.g. by acid dissolution · CPC title

• C09K8/44

  containing organic binders only · CPC title

• C09K8/426 Primary

  for plugging · CPC title

• E21B33/1208 Primary

  characterised by the construction of the sealing or packing means (E21B33/1277 takes precedence) · CPC title

• E21B2200/08

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