Retrievable bridge plug apparatus for sealing a pipe bore in...

Details Retrievable bridge plug apparatus for sealing a pipe bore in... Retrievable bridge plug apparatus for sealing a pipe bore in...

E - Fixed Constructions

21

B

E21B 33/12 (2006.01)

Patent

CA 2119386

The apparatus comprises a packer mandrel assembly having a longitudinal mandrel bore defined therethrough. A packer is disposed on the packer mandrel assembly, for sealing between the packer mandrel assembly and the pipe bore in the pipe string upon engagement of the packer with an internal upset of the pipe string and subsequent application of upward force to the packer mandrel assembly. A selectively positionable bypass is provided for preventing fill-up of a work string attached to the bridge plug apparatus as the work string and the bridge plug apparatus are run into position in the pipe string; communicating the pipe bore below the packer with a low pressure zone above the packer through the mandrel bore prior to sealing the packer against the pipe bore; isolating the pipe bore below the packer from the low pressure zone above the packer after sealing the packer against the pipe bore; and re-communicating the pipe bore below the packer with the low pressure zone above the packer through the mandrel bore to balance pressure across the packer prior to unsetting said packer.

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