Disintegrating Compression Set Plug with Short Mandrel

Patent metadata

Field	Value
Publication number	US-2016290093-A1
Application number	US-201514954525-A
Country	US
Kind code	A1
Filing date	Nov 30, 2015
Priority date	Apr 2, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

A compression set sealing element preferably 85A-95A TDI-Ester Polyurethane is compressed axially and retained against extrusion by CEM anti-extrusion rings. The compressed state of the sealing element is locked in by a degradable lock ring assembly. The mandrel is secured to an upper end of a slip cone and a breakable slip ring is secured by a wireline setting tool until the set position is reached. The slip ring breaks into segments that are pulled up the slip cone as the setting tool pushes on a sleeve to axially compress the sealing element and lock in the set. The sealing element is retained against extrusion by CEM anti-extrusion rings. When the setting tool is removed a ball seat is exposed for delivery of a ball to build pressure into the formation for fracturing. The entirety of the plug then disintegrates from well fluid exposure.

First claim

We claim:

1 . A plug or packer assembly for subterranean use, comprising:
a mandrel having a cylindrical outer surface; a slip assembly and an actuator for said slip assembly; a seal assembly on said cylindrical outer surface of said mandrel, said cylindrical outer surface of said mandrel representing a constant internal diameter of said seal assembly, said seal assembly actuated with axial compression of said seal assembly to axially collapse said seal assembly while maintaining said constant internal diameter and forcing said seal assembly by virtue of said axial collapse into contact with a surrounding borehole wall; wherein said mandrel, slip assembly, actuator for said slip assembly and said seal assembly comprise one or more materials that disintegrate over time at the subterranean location.

2 . The assembly of claim 1 , wherein:
said mandrel supports said actuator for said slip assembly adjacent an upper end of said actuator for said slip assembly.

3 . The assembly of claim 1 , wherein:
said mandrel terminates within said actuator for said slip assembly adjacent an upper end of said actuator for said slip assembly.

4 . The assembly of claim 1 , wherein:
said mandrel further comprises a disintegrating locking member to hold the axially compressed position of said seal assembly.

5 . The assembly of claim 4 , wherein:
said seal assembly further comprises at least one anti-extrusion ring on at least one end of said seal assembly, said anti-extrusion ring comprises a disintegrating material.

6 . The assembly of claim 5 , wherein:
said at least one anti-extrusion ring comprises a plurality of anti-extrusion rings with at least one disposed on each of opposed ends of said seal assembly.

7 . The assembly of claim 1 , wherein:
said seal assembly comprises a polymer.

8 . The assembly of claim 1 , wherein:
said mandrel, slip assembly and actuator for said slip assembly comprises a controlled electrolytic material (CEM).

9 . The assembly of claim 4 , wherein:
said locking member comprises a controlled electrolytic material (CEM).

10 . The assembly of claim 6 , wherein:
said anti-extrusion rings comprise a controlled electrolytic material (CEM).

11 . The assembly of claim 1 , wherein:
said seal assembly comprising a seal having the shape of a sleeve with an internal ring between said mandrel and an inside surface of said sleeve, said internal ring comprises a disintegrating material.

12 . The assembly of claim 11 , wherein:
said internal ring comprises a polymer.

13 . The assembly of claim 1 , wherein:
said actuator for said slip assembly comprising a cone with a cone passage therethrough, said mandrel having a mandrel passage therethrough that aligns with said cone passage.

14 . The assembly of claim 13 , wherein:
said mandrel is threaded to a top of said cone and said thread represents the extension of said mandrel into said cone or said mandrel is made integral with said cone.

15 . The assembly of claim 6 , wherein:
said seal assembly comprises a polymer further comprising at least one from a group comprising: PC-PPDI, PC-MDI, PD-TDI, Ether-PPDI, Ether-MDI, Ether-TDI, Esther-PPDI, Ester-MDI, Ester-TDI or PGA and TDI-Ester Polyurethane.

16 . The assembly of claim 15 , wherein:
said mandrel, slip assembly and actuator for said slip assembly comprises a controlled electrolytic material (CEM).

17 . The assembly of claim 16 , wherein:
said locking member comprises a controlled electrolytic material (CEM) or a polymer further comprising at least one from a group comprising: PC-PPDI, PC-MDI, PD-TDI, Ether-PPDI, Ether-MDI, Ether-TDI, Esther-PPDI, Ester-MDI, Ester-TDI or PGA and TDI-Ester Polyurethane.

18 . The assembly of claim 17 , wherein:
said anti-extrusion rings comprise a controlled electrolytic material (CEM) or a polymer further comprising at least one from a group comprising: PC-PPDI, PC-MDI, PD-TDI, Ether-PPDI, Ether-MDI, Ether-TDI, Esther-PPDI, Ester-MDI, Ester-TDI or PGA and TDI-Ester Polyurethane.

19 . The assembly of claim 18 , wherein:
said seal assembly comprising a seal having the shape of a sleeve with an internal ring between said mandrel and an inside surface of said sleeve, said internal ring comprises disintegrating material.

20 . The assembly of claim 19 , wherein:
said internal ring comprises a polymer further comprising at least one from a group comprising: PC-PPDI, PC-MDI, PD-TDI, Ether-PPDI, Ether-MDI, Ether-TDI, Esther-PPDI, Ester-MDI, Ester-TDI or PGA and TDI-Ester Polyurethane.

21 . The assembly of claim 1 , wherein:
said disintegration over time occurs from exposure to naturally or artificially created conditions at the subterranean location.

22 . The assembly of claim 1 , wherein:
said seal assembly comprises a polymer.

23 . The assembly of claim 7 wherein:
said polymer comprises at least one from a group comprising: PC-PPDI, PC-MDI, PD-TDI, Ether-PPDI, Ether-MDI, Ether-TDI, Esther-PPDI, Ester-MDI, Ester-TDI or PGA and TDI-Ester Polyurethane.

24 . The assembly of claim 4 , wherein:
said polymer comprises at least one from a group comprising: PC-PPDI, PC-MDI, PD-TDI, Ether-PPDI, Ether-MDI, Ether-TDI, Esther-PPDI, Ester-MDI, Ester-TDI or PGA and TDI-Ester Polyurethane.

25 . The assembly of claim 12 , wherein:
said polymer comprises at least one from a group comprising: PC-PPDI, PC-MDI, PD-TDI, Ether-PPDI, Ether-MDI, Ether-TDI, Esther-PPDI, Ester-MDI, Ester-TDI or PGA and TDI-Ester Polyurethane.

26 . The assembly of claim 6 , wherein:
said anti-extrusion rings comprise at least one from a group comprising: PC-PPDI, PC-MDI, PD-TDI, Ether-PPDI, Ether-MDI, Ether-TDI, Esther-PPDI, Ester-MDI, Ester-TDI or PGA and TDI-Ester Polyurethane.

27 . The assembly of claim 11 , wherein:
said internal ring comprises a controlled electrolytic material (CEM).

28 . The assembly of claim 1 , wherein:
said seal assembly further comprises at least one disintegrating seal ring adjacent at least one end of a sealing element.

29 . The assembly of claim 28 , wherein:
said at least one seal ring comprises opposed seal rings adjacent opposed ends of said sealing element, said seal rings further comprising a controlled electrolytic material (CEM).

30 . A well treatment method, comprising:
deploying the plug or packer of claim 1 to isolate a portion of a borehole; applying pressure against said plug or packer.

31 . The method of claim 30 , comprising:
allowing said plug or packer to disintegrate after said applying pressure.

32 . The assembly of claim 1 , wherein:
said slip assembly further comprises a roughened outer surface coated with at least one layer of grip enhancing grit.

33 . The assembly of claim 32 , wherein:
said grit comprises melted wires creating the particles blown onto said outer surface.

34 . A method of applying a grit coating to a downhole component to enhance gripping capability comprising:
providing wires in a spray gun; disposing said wires in a fluid channel; running current through said wires; creating the grit by causing the wires to melt with said current in the fluid channel; delivering the resulting grit onto the surface of the base metal.

Assignees

• Baker Hughes Inc

Inventors

• Doane James C
• Harper Jason M
• Xu Yingqing
• Pratt Barbara A
• Anderson Gary L
• Bishop David S
• Ruffo Antonio C
• Taylor Robert J
• David Anton
• Acquaye David K

Classifications

• E21B33/1291

  anchor set by wedge or cam in combination with frictional effect, using so-called drag-blocks (E21B33/1295 takes precedence) · CPC title

• E21B33/128 Primary

  with a member expanded radially by axial pressure (E21B33/122, E21B33/124 take precedence) · CPC title

• E21B2200/08

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

• C23C4/123

  Spraying molten metal · CPC title

• E21B33/129

  with mechanical slips for hooking into the casing (E21B33/122, E21B33/124 take precedence) · CPC title