Abstract: A downhole sealing apparatus having a sealing assembly with one or more seal elements configured to engage a bore wall or bore-lining tubular wall to seal an annulus between the apparatus and the wall or tubular wall. A bypass arrangement is configured to provide selective bypass of the sealing assembly and the sealing apparatus is reconfigurable between a first configuration permitting bypass of the sealing assembly and a second configuration in which the bypass arrangement prevents or restricts bypass of the sealing assembly. A downhole method provides the downhole sealing apparatus within a bore hole, with the downhole sealing apparatus reconfigured from the first configuration in which the bypass arrangement permits bypass of the sealing assembly to a second configuration in which the bypass arrangement prevents or restricts bypass of the sealing assembly.

Abstract: 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.

Abstract: A back-up ring (1) for a gland seal includes at least two part ring portions (2,4). Each part ring portion comprises first (6, 10) and second (8, 12) ends. Each end has an undulating surface (22, 24) for overlapping in engagement with a corresponding undulating surface on an end of another part ring portion, to form the back-up ring (1). When the part ring portions (2,4) are assembled to form the back-up ring (1) and are held together by axial and/or radial compression, the engagement of the undulating surfaces (22, 24) restricts relative movement between the part ring portions. A seal assembly (34) including the back-up ring (1) is also disclosed.

Abstract: A downhole sealing apparatus having a sealing assembly with one or more seal elements configured to engage a bore wall or bore-lining tubular wall to seal an annulus between the apparatus and the wall or tubular wall. A bypass arrangement is configured to provide selective bypass of the sealing assembly and the sealing apparatus is reconfigurable between a first configuration permitting bypass of the sealing assembly and a second configuration in which the bypass arrangement prevents or restricts bypass of the sealing assembly. A downhole method provides the downhole sealing apparatus within a bore hole, with the downhole sealing apparatus reconfigured from the first configuration in which the bypass arrangement permits bypass of the sealing assembly to a second configuration in which the bypass arrangement prevents or restricts bypass of the sealing assembly.

Abstract: 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.

Abstract: A valve assembly comprising a body having a main passage, and a valve member which is located in the main passage and which is rotatable between an open position in which the main passage is substantially open, and a closed position in which the valve member substantially blocks the main passage, and an actuator which is movable generally parallel to the longitudinal axis of the main passage, the actuator being engaged with the valve member such that movement of the actuator generally parallel to the longitudinal axis of the main passage causes the valve member to rotate between its open and closed positions.

Abstract: A valve assembly comprising a body having a main passage, and a valve member which is located in the main passage and which is rotatable between an open position in which the main passage is substantially open, and a closed position in which the valve member substantially blocks the main passage, and an actuator which is movable generally parallel to the longitudinal axis of the main passage, the actuator being engaged with the valve member such that movement of the actuator generally parallel to the longitudinal axis of the main passage causes the valve member to rotate between its open and dosed positions.