Slip with altering load distribution feature

Patent metadata

Field	Value
Publication number	US-9759027-B2
Application number	US-201313893565-A
Country	US
Kind code	B2
Filing date	May 14, 2013
Priority date	May 14, 2013
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

A liner hanger has slips held by a slip body. A potential energy force to move the slips axially when the hanger is in position is selectively released. The slips move axially and radially outwardly guided on opposed edges by the slip body. The slip faces have wickers that dig into the surrounding casing that will support a liner string off the slips. Weight is set down to bring the housing into contact with the top of the slips that are already engaged to the surrounding casing. The nature of the loading between the slips and the casing changes from a radial reaction force from the casing going into the slip and then distributed circumferentially to the slip housing to an essentially axial loading of the slip housing down onto the slip that has penetrated the casing with an opposite reaction force in the casing wall.

First claim

We claim:

1. An anchor assembly for subterranean use in connecting an inner tubular string to a surrounding tubular, comprising:
a tubular slip housing having at least one slip relatively movable with respect to said slip housing in a corresponding at least one slot, said slot having opposed faces in contact with opposed sides of said slip, said faces oriented to move said slip radially into contact with the surrounding tubular as said slip moves axially relatively to said slip housing to advance said slip into contact with the surrounding tubular;
whereupon continuation of said relative movement beyond said contact brings an end of said slot into contact with said slip as said opposed faces are forced further apart to reorient reaction forces from the surrounding tubular on said slip from principally radial to principally axial.

2. The assembly of claim 1 , wherein:
said slip slidably mounted to said slip housing to contact said surrounding tubular.

3. The assembly of claim 2 , wherein:
said end of said slot is an integrated radial surface on said slip housing.

4. The assembly of claim 2 , wherein:
said end of said slot is a discrete ring or segments mounted to said slip housing presenting a radial surface for contact with said slip.

5. The assembly of claim 4 , wherein:
said slip comprises wickers that penetrate into the surrounding tubular due to radial movement.

6. The assembly of claim 5 , wherein:
said wickers are axially shear loaded from contact of said radial surface onto said slip.

7. The assembly of claim 6 , wherein:
said slips receive a radial reaction force when contacting the surrounding tubular.

8. The assembly of claim 7 , wherein:
said radial reaction force is redirected circumferentially through said slip and onto said opposed faces of said slot.

9. The assembly of claim 1 , wherein:
said opposed faces yield from loading as said end advances into contact with said slip.

10. The assembly of claim 9 , wherein:
said opposed faces are disposed in intersecting planes.

11. The assembly of claim 10 , wherein:
said opposed faces slope away from each other in a radial direction away from an axis of said slip housing.

12. The assembly of claim 1 , wherein:
said at least one slip comprises a plurality of circumferentially spaced slips on said slip housing and said at least one slot comprises a plurality of slots with each said slip disposed in a respective said slot.

13. The assembly of claim 12 , wherein:
contact of said slip by said end of said slot increases the capacity of said slips by 1,000,000 pounds when compared to prior to said contact.

14. The assembly of claim 1 , wherein:
said slip is initially movable by a selectively released bias force stored on said slip housing.

15. The assembly of claim 1 , wherein:
an initial distance between said slip and said end of said slot is selected to adjust the amount of radial extension before said slip engages the surrounding tubular.

16. The assembly of claim 1 , wherein:
said slips moves in an uphole or downhole or another direction while extending radially.

Assignees

• Baker Hughes Inc

Inventors

• Meador Charles M
• Krueger Matthew J
• Hern Christopher R
• Halfmann Eric

Classifications

• E21B23/01 Primary

  for anchoring the tools or the like (E21B23/02 - E21B23/06 take precedence; anchoring of drives in the borehole E21B4/18) · CPC title