Packer with back-up retrieving method
AssigneeBaker Hughes Incorporated
InventorsWilliam D. Henderson, Jeffrey J. Lembcke
Life of this patent
Estimating the term…
Abstract
A packer or bridge plug is described which may be released by manipulation of the production tubing connected to it. If manipulation of the production tubing is unsuccessful in releasing the packer, the tensile strength of the production tubing need not be exceeded in attempting to remove the packer. Instead, the production tubing is removed along with certain internal components of the packer. Thereafter, heavy-wall tubing, with or without jars, can be lowered into the wellbore with a retrieving tool at the bottom of that string. The retrieving tool latches onto components of the packer to allow an alternative method of release which allows for use of significantly higher tensile loads to liberate the packer from the wellbore.
Claims17
A method of setting and releasing a packer downhole, comprising:
- running in a packer to a desired depth;
- setting at least one slip;
- setting at least one sealing element;
- locking the set of said sealing element with a locking assembly;
- attaching production tubing to the packer;
- moving a mandrel in the packer with said production tubing;
- providing a first mode of release as a result of shifting said mandrel which unlocks said locking assembly;
- removing said production tubing;
- providing access to said locking assembly by said removal of said production tubing;
- and
- defeating said locking assembly by alternate means as a second mode of release for the packer.
A releasable packer for use in a wellbore, comprising:
- a body;
- at least one slip on said body;
- at least one sealing element on said body;
- a mandrel selectively movable with respect to said body;
- a locking assembly to secure at least a first portion of said mandrel to said body for securing the setting of the slip and sealing element;
- the remaining second portion of said mandrel movable to selectively engage said locking assembly for defeat thereof as a first mode of release of the packer;
- and
- said second portion of said mandrel removable from said body to allow insertion of a release tool to engage said locking assembly as a second mode of release in the event a force of a predetermined value on said second portion of said mandrel fails to release the packer.
Dependencies are inferred from the claim text.