Wear bushing with hanger lockdown

Patent metadata

Field	Value
Publication number	US-9476262-B2
Application number	US-201414218269-A
Country	US
Kind code	B2
Filing date	Mar 18, 2014
Priority date	Mar 18, 2014
Publication date	Oct 25, 2016
Grant date	Oct 25, 2016

Abstract

A wear bushing assembly protects and locks down a hanger in a wellhead housing; and which includes a wear bushing body that inserts into a wear bushing sleeve. A lock ring extends into registered recesses on the body and sleeve to couple together the body and sleeve. The wellhead housing has a profiled recess circumscribing its inner surface. A lockdown ring selectively mates with the profiled recess; and when mated is in interfering contact with an upper surface of the wear bushing sleeve, thereby coupling the sleeve to the wellhead housing. The sleeve outer surface is profiled to interfere with upward movement of the hanger, so that force is transferred from the hanger to the housing through the sleeve which locks down the housing.

First claim

What is claimed is:

1. A wear bushing assembly for use with a wellhead assembly having a wellhead housing, the wear bushing assembly comprising:
an annular wear bushing sleeve having an inner surface defining a sleeve recess and a lower end selectively in interfering contact with an upper end of a hanger that is landed in the wellhead housing;
an annular wear bushing body having an outer surface defining a body recess and that inserts within and selectively couples to the wear bushing sleeve;
a lockdown ring that selectively couples to an inner surface of the wellhead housing and into interfering contact with an upper end of the wear bushing sleeve when the wear bushing body is landed in the wear bushing sleeve, so that when the wear bushing body is landed in the wear bushing sleeve and the wear bushing sleeve lands in the hanger, an axial lockdown force is transmitted between the hanger and the wellhead housing and through the wear bushing sleeve that opposes axial movement of the hanger in a direction towards the lockdown ring;
a lock ring that couples together the wear bushing sleeve and wear bushing body by moving into interfering contact when the sleeve recess registers with the body recess; and
a push rod extending through the wear bushing sleeve and having a first end and a second end, the first end of the push rod contacting the lock ring, and the second end of the push rod projecting radially outward from the wear bushing sleeve so that as the lower end of the wear bushing sleeve moves toward the upper end of the hanger, the upper end of the hanger pushes the second end of the push rod toward the lock ring and the first end of the push rod in turn pushes the lock ring into the body recess so the wear bushing body can move axially relative to the wear bushing sleeve.

2. The wear bushing assembly of claim 1 , wherein the wear bushing assembly is in a landed configuration when the body and sleeve recesses are registered.

3. The wear bushing assembly of claim 1 , wherein the sleeve recess comprises a lower sleeve recess, and wherein the lock ring is in interfering contact with the body recess and an upper sleeve recess on the outer surface of the wear bushing sleeve that is axially above the lower sleeve recess and when the wear bushing assembly is in a running configuration.

4. The wear bushing assembly of claim 3 , wherein the push rod radially extends through the wear bushing sleeve with the first end of the push rod that intersecting the upper sleeve recess.

5. The wear bushing assembly of claim 4 , wherein the second end of the push rod contacts the upper end of the hanger as the wear bushing sleeve is inserted into the hanger.

6. The wear bushing assembly of claim 1 , wherein the lockdown ring is frangibly connected to the wear bushing body.

7. The wear bushing assembly of claim 1 , wherein the wear bushing body has an outer diameter that transitions radially outward for urging the lockdown ring into engagement with a groove formed on an inner surface of the wellhead housing.

8. The wear bushing assembly of claim 1 , wherein a profile of the inner surface of the wear bushing sleeve defines an upward facing shoulder on which a downward facing shoulder on an outer surface of the wear bushing body is supported when the wear bushing body is landed in the wear bushing sleeve.

9. A wear bushing assembly for use with a wellhead assembly having a wellhead housing, the wear bushing assembly comprising: an annular wear bushing sleeve having an inner surface defining a sleeve recess and an inner bore that transitions radially inward a distance to define an upward facing shoulder, and having a lower portion that is selectively in interfering contact with a casing hanger that is landed in the wellhead housing; an annular wear bushing body having an outer surface defining a body recess and an outer surface profiled to define a downward facing shoulder, and that is insertable in the wear bushing sleeve to a running position with the upward and downward facing shoulders spaced apart, and that is inserted in the wear bushing sleeve is to a landed position with the downward facing shoulder in interfering contact with the upward facing shoulder; a lockdown ring circumscribing the wear bushing body and that selectively engages an inner surface of the wellhead housing and that is in interfering contact with an upper end of the wear bushing sleeve when the wear bushing body is in the landed position; a lock ring that couples to the wear bushing sleeve and wear bushing body by moving into interfering contact when the sleeve recess registers with the body recess; and a push rod extending through the wear bushing sleeve and having a first end and a second end, the first end of the push rod contacting the lock ring, and the second end of the push rod projecting radially outward from the wear bushing sleeve so that as the lower portion of the wear bushing sleeve moves toward the hanger, the hanger pushes the second end of the push rod toward the lock ring and the first end of the push rod in turn pushes the lock ring into the body recess so the wear bushing body can move axially relative to the wear bushing sleeve.

10. The wear bushing assembly of claim 9 , wherein the sleeve recess includes an upper sleeve recess and a lower sleeve recess, and wherein the lock ring is in interfering contact between the body recess and the upper sleeve recess when the sear bushing body is in the running position, and in interfering contact between the body recess and the lower sleeve recess when the wear bushing body is in the landed position.

11. The wear bushing assembly of claim 10 , wherein the push rod projects through a sidewall of the wear bushing sleeve for urging the lock ring out of the upper sleeve recess so that the wear bushing body and lock ring slide axially with respect to the wear bushing sleeve until the body recess and lower sleeve recess register with one another.

12. A wear bushing assembly for use with a wellhead assembly having a wellhead housing, the wear bushing assembly comprising: an annular wear bushing sleeve selectively inserted into the wellhead housing and landed on an upper end of a casing hanger; an annular wear bushing body selectively inserted into the wear bushing sleeve and moveable between a running position and a landed position that is axially spaced away from the running position; a lockdown ring that circumscribes the wear bushing body and has undulations on an outer surface, and when the wear bushing body is in the landed position, the undulations engage a profiled portion on an inner surface of the wellhead housing so that the lock ring is in interfering contact with an upper end of the wear bushing sleeve; and a protrusion on an outer surface of the wear bushing body for urging the lock ring radially outward into engagement with the profiled portion; and a body recess on an outer surface of the wear bushing body, an upper sleeve recess on an inner surface of the wear bushing sleeve that registers with the body recess when the wear bushing body is in the running position, and a lower sleeve recess spaced axially away from the upper sleeve recess and on the inner surface of the wear bushing sleeve that registers with the body recess when the wear bushing body is in the landed position.

13. The wear bushing assembly of claim 12 , further comprising a lock ring for coupling the wear bushing body to the wear bushing sleeve.

14. The wear bushing assembly of claim 13 , wherein when the wear bushing body is in the running position, the lock ring extends radially into the body recess and upper sleeve recess and is in interfering contact with the wear bus

Assignees

• Vetco Gray Inc

Inventors

• Benson Daniel Caleb
• Ford David Lawrence
• Peters Stephen David

Classifications

• E21B33/03

  Well heads; Setting-up thereof · CPC title

• E21B17/1007 Primary

  for the internal surface of a pipe, e.g. wear bushings for underwater well-heads · CPC title

• E21B33/068

  having provision for introducing objects or fluids into, or removing objects from, wells (cementing-heads E21B33/05) · CPC title

• E21B33/037

  Protective housings therefor · CPC title

• E21B17/10

  Wear protectors; Centralising devices {, e.g. stabilisers} · CPC title