Patent attributes
A downhole packer apparatus for establishing a seal in an annulus between the apparatus and a wall of a bore or bore-lining tubing. The apparatus comprises a body and a plurality of sealing elements configured for mounting on the body, each sealing element engages the wall of the bore or bore-lining tubing dividing the annulus into a plurality of annulus portions. A bypass arrangement operatively associated with each of the sealing elements communicates fluid between the respective plurality of annulus portions. A valve arrangement is configured for controlling flow between the respective plurality of annulus portions via the fluid communication arrangement, and is configurable between a first configuration in which fluid communication between the respective plurality of annulus portions is prevented and a second configuration in which fluid communication between the respective plurality of annulus portions is permitted, in response to a predetermined threshold pressure differential across the valve arrangement.
