Solid-core filament-wound composite mandrel

Patent metadata

Field	Value
Publication number	US-10494893-B2
Application number	US-201715475970-A
Country	US
Kind code	B2
Filing date	Mar 31, 2017
Priority date	Apr 1, 2016
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

Abstract

A technique for manufacturing a millable bridge plug for plugging of a wellbore during, for example, a fracturing operation. A bridge plug is constructed with an obstructed internal passage. The obstructed internal passage is formed by winding a composite material about a wrapping mandrel having at least one cylindrical part and a solid part coupled thereto. The cylindrical part is removed after a curing process leaving a mandrel with a plugged internal passageway upon which a seal member combined with a plurality of slips for engaging a surrounding wall, e.g. a surrounding wellbore wall, may be coupled.

First claim

What is claimed is:

1. A mandrel for substantially preventing fluid flow in a wellbore, the mandrel comprising:
an outer mandrel member having an inner surface that defines a channel that extends from a first end of the outer mandrel member to a second end of the outer mandrel member; and
a plug positioned within the channel between the first end and the second end, the plug contacting the inner surface of the outer mandrel member at a plug interface,
wherein the inner surface has an inner diameter between the first end of the outer mandrel member and the plug interface,
wherein the inner surface has an interface diameter at the plug interface, and
wherein the interface diameter is greater than the inner diameter.

2. The mandrel of claim 1 , wherein the outer mandrel member comprises a composite material.

3. The mandrel of claim 1 , wherein the plug has a biconic shape.

4. The mandrel of claim 1 , wherein the inner diameter is a first inner diameter, and wherein the inner surface has a second inner diameter between the second end of the outer mandrel member and the plug interface, and wherein the first inner diameter is substantially equal to the second inner diameter.

5. The mandrel of claim 1 , wherein the plug is positioned in a center of the channel.

6. The mandrel of claim 1 , wherein the plug comprises a non-metallic solid.

7. A bridge plug for substantially preventing fluid flow in a wellbore, the bridge plug comprising:
a mandrel comprising:
an outer mandrel member having an inner surface that defines a channel that extends from a first end of the outer mandrel member to a second end of the outer mandrel member, and
a plug positioned within the channel between the first end and the second end, the plug contacting the inner surface of the outer mandrel member at a plug interface,
wherein the plug is inlaid into the outer mandrel member,
wherein the inner surface has an inner diameter between the first end of the outer mandrel member and the plug interface,
wherein the inner surface has an interface diameter at the plug interface, and
wherein the interface diameter is greater than the inner diameter;

a seal member selectively actuatable into sealing engagement with an inner surface of the wellbore; and
a plurality of slips actuatable into sealing engagement with the inner surface of the wellbore.

8. The mandrel of claim 1 ,
wherein the inner diameter is a diameter of the channel between the first end of the outer mandrel member and the plug interface, and
wherein the interface diameter is a diameter of the channel at the plug interface.

9. A method of forming a mandrel for substantially preventing fluid flow in a wellbore, the method comprising:
coupling a first and a second wrapping mandrel to a plug to form a single wrapping mandrel;
winding the single wrapping mandrel with a composite material to form an outer mandrel member, the plug contacting an inner surface of the outer mandrel member at a plug interface; and
detaching the first and the second wrapping mandrels from the plug, wherein the plug remains in a channel formed by the outer mandrel member, wherein the inner surface has an inner diameter between a first end of the outer mandrel member and the plug interface, and wherein the inner surface has an interface diameter at the plug interface, wherein the interface diameter is greater than the inner diameter.

10. The method of claim 9 , further comprising:
applying a coating material onto each of the first and second mandrels.

11. The method of claim 9 , further comprising:
coupling a seal member to the mandrel, the seal member being selectively actuatable into sealing engagement with an inner surface of the wellbore; and
coupling a plurality of slips to the mandrel, the plurality of slips being actuatable into sealing engagement with the inner surface of the wellbore.

12. The method of claim 9 , wherein coupling the first and the second wrapping mandrels to the plug comprises at least one of threading, friction fitting, and mechanical interference.

13. The method of claim 9 , wherein the inner diameter is a first inner diameter, and wherein the inner surface has a second inner diameter between a second end of the outer mandrel member and the plug interface, and wherein the first inner diameter is substantially equal to the second inner diameter.

14. The method of claim 9 , wherein the plug is positioned in a center of the channel.

15. The method of claim 9 , wherein the plug comprises a non-metallic solid.

Assignees

• Schlumberger Technology Corp

Inventors

• Tse Kyle
• Jarrett Colby

Classifications

• E21B33/1208 Primary

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

• B29C53/56

  Winding and joining, e.g. winding spirally {(winding in general B65H)} · CPC title

• B29C53/824

  collapsible, e.g. elastic or inflatable; with removable parts, e.g. for regular shaped, straight tubular articles (B29C53/825 takes precedence) · CPC title

• E21B33/134

  Bridging plugs · CPC title

• B29C53/822

  Single use mandrels, e.g. destructible, becoming part of the wound articles (B29C53/825 takes precedence) · CPC title