Dissolvable composite slips and methods of manufacturing same

Patent metadata

Field	Value
Publication number	US-10544645-B2
Application number	US-201715720559-A
Country	US
Kind code	B2
Filing date	Sep 29, 2017
Priority date	Sep 29, 2016
Publication date	Jan 28, 2020
Grant date	Jan 28, 2020

Abstract

A dissolvable composite slip can include at least in part a dissolvable material. A dissolvable composite slip can include at least in part a non-dissolvable metallic material. The dissolvable material should be strong enough to support the non-dissolvable metallic material which serves as teeth to set into the casing during the function of the downhole tool. The dissolvable material can include but is not limited to a polymeric material or a metallic material. At least a part of the slip is able to be set as well as be dissolved.

First claim

What is claimed is:

1. A dissolvable composite slip, comprising:
a slip segment being comprised of a non-metallic disintegrated substrate and having a groove;
a wedge insert having an inner wedge portion and an outer wedge portion opposite said inner wedge portion, being housed in said groove and being comprised of a dissolvable metallic material; and
a rough surface element on said outer wedge portion, said rough surface element being comprised of non-dissolvable material,
wherein a position of said rough surface element relative to said wedge insert is independent from a position of said rough surface element relative to said non-metallic disintegrated substrate of said slip element.

2. The dissolvable composite slip of claim 1 , wherein said non-metallic disintegrated substrate comprises a polyglycolic acid polymer or a polyactic acid polymer, wherein said dissolvable metallic material comprises a Mg alloy, or an Al alloy.

3. The dissolvable composite slip of claim 1 , further comprising; a buffer layer being comprised of a metallic coating and being positioned between said rough surface element and said outer wedge portion.

4. The dissolvable composite slip of claim 3 , wherein said metallic coating comprises a Co alloy or a Ni alloy.

5. The dissolvable composite slip of claim 1 , wherein said rough surface element comprises at least one of a group consisting of: a Fe based alloy, carbide, oxide, sulfide, nitride, silicide; and a combination thereof.

6. A method for removing a downhole tool, the method comprising the steps of:
forming a dissolvable composite slip, comprising:
a slip segment being comprised of a non-metallic disintegrated substrate and having a groove; and
a wedge insert housed in said groove and being comprised of a dissolvable metallic material; and
a rough surface element on said wedge insert opposite said slip segment, said rough surface element being comprised of non-dissolvable material

setting said dissolvable composite slip within a tubular member in a wellbore;
disintegrating said non-metallic disintegrated substrate into a plurality of pieces so as to release said wedge insert and said rough surface element down said wellbore; and
dissolving said dissolvable metallic material with a dissolving agent.

7. The method of claim 6 , wherein said dissolvable composite clip further comprises: a metallic coating between said rough surface element and said wedge insert.

8. The method of claim 7 , wherein said metallic coating comprises a Co alloy or a Ni alloy.

9. The method of claim 6 , wherein said non-metallic disintegrated substrate comprises a polyglycolic acid polymer or a polyactic acid polymer.

10. The method of claim 6 , wherein said dissolvable metallic material comprises a Mg alloy or an Al alloy.

11. The method of claim 6 , wherein said rough surface element comprises at least one of a group consisting of: a Fe based alloy, carbide, oxide, sulfide, nitride, silicide; and a combination thereof.

Assignees

• Cnpc Usa Corp

Inventors

• Xu Jianhui

Classifications

• B32B15/015

  the said other metal being copper or nickel or an alloy thereof · CPC title

• E21B23/06

  for setting packers · CPC title

• E21B33/1265

  with mechanical slips · CPC title

• E21B33/1292

  with means for anchoring against downward and upward movement · CPC title

• C22C21/00

  Alloys based on aluminium · CPC title