Annular blowout preventer (BOP) packing unit with integrated secondary sealing compound

Patent metadata

Field	Value
Publication number	US-9957770-B2
Application number	US-201514595761-A
Country	US
Kind code	B2
Filing date	Jan 13, 2015
Priority date	Jan 13, 2015
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

An annular blowout preventer includes a body, a piston disposed within the body, and a packing unit disposed adjacent the piston. The packing unit includes an packer body surrounding an opening. The packer body is fabricated from a first material. The packing unit further includes a second material disposed between the packer body and the opening, the second material being less rigid than the first material. The packer body and the second material constrict the opening when the annular blowout preventer is actuated. The second material creates a seal around a tool disposed within the opening. The second material fills in one or more crevices or recesses on an outer perimeter of the tool.

First claim

What is claimed is:

1. An annular blowout preventer, comprising:
a body;
a piston disposed within the body; and
a packing unit disposed adjacent the piston, the packing unit comprising:
a packer body surrounding an opening;
an internal chamber formed within the packer body, the internal chamber filled with a fluid sealing compound;
a channel in fluid communication with the chamber; and
a separation between the channel and the opening,

wherein, upon actuation of the annular blowout preventer, at least a portion of the fluid sealing compound is configured to be expelled through the separation in fluid form and into the opening when the packing unit is compressed; and
wherein the packing unit is compressed when the piston is urged against the packing unit during actuation of the annular blowout preventer.

2. The annular blowout preventer of claim 1 , wherein the sealing compound is an epoxy resin, a jelly sealant, polyurethane material, or foamed derivatives of these materials.

3. The annular blowout preventer of claim 2 , wherein the sealing compound is modified to provide sufficient setting time or delay of sealant at downhole conditions through inclusion of one or more chemical delay agents or activators.

4. The annular blowout preventer of claim 1 , wherein the separation comprises a breakable seal.

5. The annular blowout preventer of claim 1 , wherein the fluid sealing compound is formulated to harden after exiting the packer body into the opening and being exposed to downhole conditions.

6. The annular blowout preventer of claim 1 , wherein the packer body is fabricated from a compliant rubber material.

7. The annular blowout preventer of claim 1 , wherein the fluid sealing compound is retained within the internal chamber when the packing unit is in the neutral state.

8. The annular blowout preventer of claim 1 , further comprising a second internal chamber filled with a second fluid sealing compound, the second internal chamber configured to be compressed by the piston upon actuation of the annular blowout preventer, wherein, upon actuation, at least a portion of the second fluid sealing compound is configured to flow out of the second internal chamber, and mix with the fluid sealing compound to form a seal.

9. The annular blowout preventer of claim 8 , wherein the second fluid sealing compound comprises a catalyst, crosslinker, curing agent, hardening agent, or other compound with a reactive affinity toward the fluid sealing compound held within the internal chamber.

10. A method of sealing a well, comprising:
actuating an annular blowout preventer, wherein the blowout preventer comprises a piston and a packing unit, the packing unit comprising a packer body having an opening formed therethrough;
urging the piston against the packing unit, wherein the packing unit comprises a first material which is in a solid form and a second material which is in a fluid form when within the packing unit;
compressing the packing unit and thereby constricting the opening with the first material; and
sealing gaps between a tool and the first material with the second material when the tool is disposed through the opening.

11. The method of claim 10 , wherein the second material is disposed in an internal chamber within the packing unit when the annular blowout preventer is in a neutral state, and wherein the internal chamber is coupled to the opening via one or more channels.

12. The method of claim 11 , further comprising:
expelling the second material from the internal chamber and into the opening when the packing unit is compressed; and
flowing the second material around the tool and filling in any gaps between the tool and the first material.

13. The method of claim 12 , further comprising:
expelling a third material from a second internal chamber and into the opening when the packing unit is compressed; and
mixing the third material and the second material to form a sealing agent, the sealing agent filling in any gaps between the tool and the first material.

14. The method of claim 13 , wherein the third material is a catalyst, crosslinker, curing agent, hardening agent, or other compound with a reactive affinity toward the second material.

15. The method of claim 10 , wherein the first material is nitrite, urethane, or any combination thereof, and wherein the second material comprises epoxy resin, sealant jelly, caulk, polyurethane, sealant composites, the precursor additives to provide these compounds, or any combination thereof.

16. The method of claim 10 , wherein the second material hardens after exiting the packer body into the opening.

17. A method of sealing an annulus of a well, comprising:
actuating an annular blowout preventer, wherein the annular blowout preventer comprises a packing unit and an internal chamber connected to an annulus, wherein the internal chamber comprises a sealing compound in a fluid state;
constricting the packing unit such that the packing unit tightens around an internal pipe;
expelling at least a portion of the fluid sealing compound from the internal chamber into the annulus;
hardening the sealing compound such that a hardened sealing compound and the packing unit form a seal within the annulus.

18. The method of sealing an annulus of a well of claim 17 , wherein the hardening of the sealing compound is triggered by a second compound with a reactive affinity toward the sealing compound.

19. The method of sealing an annulus of a well of claim 17 , wherein the annular blowout preventer additionally comprises a piston adjacent to the packing unit, wherein the piston constricts the packing unit and expels the fluid sealing compound when the annular blowout preventer is actuated.

20. The method of sealing an annulus of a well of claim 17 , further comprising a breakable seal between the internal chamber and the annulus.

Assignees

• Averill William Stephen
• Fuller Michael James
• Witt Dana Earl
• Chevron Usa Inc

Inventors

• Averill William Stephen
• Fuller Michael James
• Witt Dana Earl

Classifications

• E21B33/06 Primary

  Blow-out preventers {, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers (rotating blow-out preventers E21B33/085)} · CPC title