Retrievable packer assembly and system with releasable body lock ring
First Claim
1. A releasable packer assembly comprising:
- a central mandrel defining a flowbore within;
a compressible packer element surrounding the central mandrel to be set against a wall of a wellbore;
a hydraulic setting assembly for compressing the packer element into a set position against a wellbore wall;
a locking member that selectively engages the central mandrel for securing the packer element in a set position; and
a release assembly for selectively releasing the locking member from engagement with the central mandrel.
1 Assignment
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Accused Products
Abstract
A releasable packer device and a method for selectively releasing a packer assembly from a set position in a wellbore. A packer assembly is described that incorporates a split body lock ring that is in ratcheting engagement with a central mandrel to secure the packer elements in a set position. In addition, there is a mechanical means for releasing the body lock ring from its locking position to an unlocked position. The body lock ring is released by radially expanding the ring by urging an axially-movable release sub with a releasing portion into contact with the body lock ring to unseat the ratcheting mechanism that retains the packer assembly in its set position.
57 Citations
23 Claims
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1. A releasable packer assembly comprising:
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a central mandrel defining a flowbore within;
a compressible packer element surrounding the central mandrel to be set against a wall of a wellbore;
a hydraulic setting assembly for compressing the packer element into a set position against a wellbore wall;
a locking member that selectively engages the central mandrel for securing the packer element in a set position; and
a release assembly for selectively releasing the locking member from engagement with the central mandrel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for releasably setting a packer assembly against a wall of a wellbore comprising:
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a packer element that is compressible to be set against a wall of a wellbore;
a locking assembly having a split-ring locking member to secure the packer element in a set position via a ratcheting engagement;
an axially movable release sleeve;
an axially movable release sub that is actuated by the release sleeve, the release sub having a releasing portion to contact the locking member and release it from ratcheting engagement. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method of selectively setting and releasing a packer assembly from a set position in a wellbore comprising the steps of:
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compressing a packer element to be set against a wellbore wall;
engaging a locking member to retain the packer element in its set position;
releasing the locking member by urging a release sub into contact with the locking member to release engagement of the locking member; and
moving the locking member to release the packer element from its set position. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification