Dissolvable composite slips and methods of manufacturing same

Patent metadata

Field	Value
Publication number	US-2018087345-A1
Application number	US-201715720559-A
Country	US
Kind code	A1
Filing date	Sep 29, 2017
Priority date	Sep 29, 2016
Publication date	Mar 29, 2018
Grant date	—

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 method of manufacturing a composite slip comprising:
preparing a substrate portion comprising a dissolvable material, wherein the dissolvable material dissolves upon exposure to a dissolving agent; manufacturing a rough portion from a non-dissolvable metallic material, wherein the teeth portion does not dissolve upon exposure to the dissolving agent; and combining the substrate portion and the rough portion to form a composite slip.

2 . The method of claim 1 , further comprising having a metallic dissolvable insert between the rough portion and the substrate portion.

3 . The method of claim 1 wherein the dissolvable material is a polymeric dissolvable material or a metallic dissolvable material.

4 . The method of claim 1 wherein the rough material is selected from the group consisting of an Fe based alloy, carbide, oxide, sulfide, cast iron, low carbon steel, high carbon steel, nitride, silicide; and a combination thereof.

5 . The method of claim 4 wherein the rough material is applied by an adhesive.

6 . The method of claim 5 wherein the adhesive comprises thermal spray or epoxy glue.

7 . A dissolvable composite slip, comprising:
a substrate including a plurality of slip segments and slots between the slip segments; wherein the outer surface of at least one of the plurality of slip segments is made of hard material to form a rough surface and the rough surface does not dissolve upon exposure to the dissolving agent.

8 . The dissolvable composite slip of claim 7 , wherein the substrate comprises a dissolvable material, wherein the dissolvable material dissolves upon exposure to a dissolving agent.

9 . The dissolvable composite slip of claim 8 , wherein the dissolvable material comprises a PGA based polymer, PLA based polymer, a Mg alloy, or an Al alloy.

10 . The dissolvable composite slip of claim 7 , further comprising a metallic dissolvable insert.

11 . The dissolvable composite slip of claim 10 , wherein the metallic dissolvable insert comprises a Mg alloy or Al alloy.

12 . The dissolvable composite slip of claim 7 , further comprising a medium hard metallic coating between the rough surface and the body of the slip segment.

13 . The dissolvable composite slip of claim 12 , wherein the medium hard metallic coating comprises a Co alloy or a Ni alloy.

14 . The dissolvable composite slip of claim 7 , wherein the rough surface comprises a Fe based alloy, carbide, oxide, sulfide, nitride, silicide; and a combination thereof.

15 . A dissolvable composite slip, comprising:
a substrate including a plurality of slip segments and slots between the slip segments; each of the slip segment having one or a plurality of grooves to accommodate one or a plurality of wedge inserts; wherein the substrate is made from a dissolvable material, wherein the dissolvable material dissolves upon exposure to a dissolving agent; the wedge insert is made from a dissolvable metallic material; and wherein the outer surface of the wedge insert is made of hard material to form a rough surface, the rough surface does not dissolve upon exposure to the dissolving agent.

16 . The dissolvable composite slip of claim 15 , further comprising a medium hard metallic coating between the rough surface and the body of the wedge insert.

17 . The dissolvable composite slip of claim 16 , wherein the medium hard metallic coating comprises a Co alloy or a Ni alloy.

18 . The dissolvable composite slip of claim 15 , wherein the dissolvable material forming the substrate comprises a PGA or PLA based polymer.

19 . The dissolvable composite slip of claim 15 , wherein the dissolvable metallic material forming the wedge insert comprises a Mg alloy or an Al alloy.

20 . The dissolvable composite slip of claim 15 , wherein the rough surface is selected from comprises a Fe based alloy, carbide, oxide, sulfide, nitride, silicide; and a combination thereof.

Assignees

• Cnpc Usa Corp

Inventors

• Xu Jianhui

Classifications

• C22C21/00

  Alloys based on aluminium · CPC title

• B32B15/015

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

• E21B23/06

  for setting packers · CPC title

• E21B33/1208 Primary

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

• E21B33/1292

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