Hydraulic set packer with piston to annulus communication

摘要

A hydraulically set packer has a mandrel with an internal bore and a port communicating the internal bore outside the mandrel. A packing element disposed on the mandrel can be compressed by a piston to engage the borehole. The piston is disposed on the mandrel on a first side of the packing element and moves against the packing element when tubing pressure is communicated into a first piston chamber via the mandrel's port. To increase the setting forces, a sleeve disposed between the packing element and the mandrel defines a space communicating an opposite side of the packing element with a second pressure chamber of the piston. During high pressure operations, high pressure on the first side of the packing element acts with high pressure on the first side of the piston, increasing the pistons movement from a high pressure region to a low pressure region.

主权项

1. A hydraulically set packer for setting in an annulus of a borehole, the packer comprising:
a mandrel having an internal bore and an internal port communicating the internal bore outside the mandrel; a packing element disposed on the mandrel and being compressible to engage the borehole; a piston disposed on the mandrel on a first side of the packing element and defining first and second piston chambers, the first piston chamber being sealed and communicating exclusively with the internal bore via the internal port; and a bypass communicating a second side of the packing element with the second piston chamber of the piston, the second piston chamber being sealed and communicating exclusively with the second side of the packing element via the bypass.