Hydro-mechanical downhole tool

Patent metadata

Field	Value
Publication number	US-9506299-B2
Application number	US-201514806242-A
Country	US
Kind code	B2
Filing date	Jul 22, 2015
Priority date	Mar 14, 2011
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

A downhole tool includes a body supported from a running string; and a releasing assembly for releasing from set liner hanger portions of the tool to be retrieved to the surface. The releasing assembly includes a connecting member for engaging the tool with a liner hanger, a piston hydraulically moveable in response to fluid pressure within the tool body from a lock position to a release position for releasing the connecting member, and a clutch for rotationally releasing the tool body from the liner hanger. Rotation of the running string moves a nut upward along the body so that the running string may then be picked up to disengage the tool from the liner hanger.

First claim

What is claimed:

1. A downhole tool release assembly for releasing from a set liner hanger portions of the tool to be retrieved to the surface by a running string, the release assembly comprising:
a connecting member for engaging the tool with a liner hanger, wherein the tool includes a tool body;
a piston hydraulically moveable in response to fluid pressure within the release assembly from a lock position to a release position for releasing the connecting member; and
a plurality of clutches for rotationally releasing the tool body from the liner hanger, wherein rotation of the running string moves a running nut upward along the body to disengage the tool from the liner hanger as the running string is picked up.

2. The release assembly of claim 1 , wherein the fluid pressure within the release assembly is adjusted by a ball drop.

3. The release assembly of claim 2 further comprising a shearing device.

4. The release assembly of claim 3 , wherein a pressure differential caused by the ball drop creates a force on the piston that exceeds a predetermined set point of the shearing device.

5. The release assembly of claim 1 , further comprising a plurality of dogs.

6. The release assembly of claim 1 , wherein the release assembly achieves a torque of at least 40,000 ft/lb when supported by a running string.

7. The release assembly of claim 1 , further comprising a shear screw.

8. The release assembly of claim 7 , wherein the shear screw is configured to shear in a range between about 5 and about 50 kilopounds.

Assignees

• Smith International

Inventors

• Abraham Aju
• Latham Taylor

Classifications

• E21B23/00

  Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells (setting of casings, screens or liners E21B43/10) · CPC title

• E21B17/06 Primary

  Releasing-joints, e.g. safety joints · CPC title

• E21B23/03

  for setting the tools into, or removing the tools from, laterally offset landing nipples or pockets · CPC title

• E21B23/042

  using a single piston or multiple mechanically interconnected pistons · CPC title