Formulation and setup method of in-situ dissolvable plug

Patent metadata

Field	Value
Publication number	US-12252645-B2
Application number	US-202318359432-A
Country	US
Kind code	B2
Filing date	Jul 26, 2023
Priority date	Jul 26, 2023
Publication date	Mar 18, 2025
Grant date	Mar 18, 2025

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

We 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, wherein the cylindrical body comprises 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 to manufacture the plug in-situ in the downhole condition, wherein the dissolvable material comprises polymer material, wherein the polymer materials comprise a reaction product of an epoxy resin mixture, a cross-linker, a degradation catalyst, and viscosity enhancer, wherein the degradation catalyst is a controlled release catalyst and capped by a shell.

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 upon a trigger action.

3. The in-situ dissolvable plug of claim 1 , wherein the polymer materials comprise a fiber enhancement.

4. 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.

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