An assembly is provided that includes first and second end plates adapted to be coaxially aligned when in use. One or more members extend from the end plates or an annular ring, the annular ring provided between the end plates, the other of the end plates or annular ring comprising one or more first slots at one end thereof to be aligned with and for receiving the one or more members of the first end plate, and one or more second slots at the other end thereof to be aligned with and for receiving the one or more members. Resilient sealing members are provided around the one or more members between the end plates and annular ring, and an urging mechanism urges the first and second end plates towards the annular ring to deform the first and second resilient sealing members to engage the inner wall of the pipe.

Pipeline isolation tool for sealing extrusion gaps of up to about 20% or greater includes a pair of fenced barriers (60, 160) having overlapping segments (68/70, 168/170) for restraining a seal (40). The segments expand to a pipe wall before the seal to prevent transition of seal medium over the segments and form a support wall for the seal. The support wall may include a protection ring (200). Springs (80, 180) surround each fenced barrier for returning the support system to a relaxed position. Inner rings (90. 190) are provided on sealing element facing surfaces (64, 164) of the fenced barrier for supporting the segments. The inner rings define a smooth inner guiding surface (92, 192) for the seal. The guiding surface is tilted inwardly towards the seal for resisting the sealing element during expansion and for preventing an inside diameter of the seal from expanding outwardly when compressed.

Pipeline isolation tool for sealing extrusion gaps of up to about 20% or greater includes a pair of fenced barriers (60, 160) having overlapping segments (68/70, 168/170) for restraining a seal (40). The segments expand to a pipe wall before the seal to prevent transition of seal medium over the segments and form a support wall for the seal. The support wall may include a protection ring (200). Springs (80, 180) surround each fenced barrier for returning the support system to a relaxed position. Inner rings (90. 190) are provided on sealing element facing surfaces (64, 164) of the fenced barrier for supporting the segments. The inner rings define a smooth inner guiding surface (92, 192) for the seal. The guiding surface is tilted inwardly towards the seal for resisting the sealing element during expansion and for preventing an inside diameter of the seal from expanding outwardly when compressed.

A mechanical plug includes first and second plug portions and an elongate member. The first plug portion includes a first endwall and a first sidewall. The first sidewall includes a female section extending in a direction along a longitudinal axis of the mechanical plug. The second plug portion is movable relative to the first plug portion. The second plug portion includes a second sidewall, a second endwall coupled to the second sidewall, and a seal. The second sidewall includes a male section extending in a direction along the longitudinal axis. The seal surrounds a portion of the male section in a region along the longitudinal axis between the second endwall and the female section. The elongate member is coupled to the first and second plug portions. Actuation of the elongate member moves the first plug portion and the second plug portion toward each other to compress the seal.

A duct stringer assembly with a bulkhead. The duct stringer assembly has duct walls providing a duct with a closed cross-section. The duct is adapted to transport fluid. A bulkhead is in the duct, and the bulkhead is adapted to block the flow of fluid along the duct. The bulkhead has a bulkhead body, and a gasket sealing a gap between the bulkhead body and the duct walls.

A duct stringer assembly with a bulkhead. The duct stringer assembly has duct walls providing a duct with a closed cross-section. The duct is adapted to transport fluid. A bulkhead is in the duct, and the bulkhead is adapted to block the flow of fluid along the duct. The bulkhead has a bulkhead body, and a gasket sealing a gap between the bulkhead body and the duct walls.

A tool for gaining lateral access to a well includes a head portion configured to advance axially forwardly relative to a lateral access passage. The tool includes a first shaft and a shaft assembly including a second shaft. The second shaft is at least partly received in the first shaft so as to be axially forwardly moveable therewith. In use, axial forward movement of the first and second shafts causes forward advancement of the head portion. The second shaft is axially forwardly moveable relative to the first shaft. The first shaft includes an internal thread and the shaft assembly includes an external thread engaging the internal thread of the first shaft so that relative rotation of the internal and external threads causes the axial forward movement of the second shaft relative to the first shaft without rotation of the second shaft relative to the first shaft.

A heat exchange plug that plugs the aperture of a tubesheet with a leaking tube while also securing the tube against movement that could damage other tubes of the tubesheet. A cylindrical housing member with two different diameter body section can be inserted so that the wider diameter section is positioned in the aperture of the tubesheet and the smaller diameter section is located in the tube. An eccentric ring at the end of the housing member can engage the tube and prevent rotation as an insert member is advanced into the rear of the housing member via a threaded shank of the insert member that engages a threaded inner bore of the housing member. A ramped surface of the housing member deforms the wall of the larger diameter section of the housing member outwardly to plug the aperture while the smaller diameter section secures the tube in place.

A heat exchange plug that plugs the aperture of a tubesheet with a leaking tube while also securing the tube against movement that could damage other tubes of the tubesheet. A cylindrical housing member with two different diameter body section can be inserted so that the wider diameter section is positioned in the aperture of the tubesheet and the smaller diameter section is located in the tube. An eccentric ring at the end of the housing member can engage the tube and prevent rotation as an insert member is advanced into the rear of the housing member via a threaded shank of the insert member that engages a threaded inner bore of the housing member. A ramped surface of the housing member deforms the wall of the larger diameter section of the housing member outwardly to plug the aperture while the smaller diameter section secures the tube in place.

A valve assembly may provide a body comprising a bottom portion and a top portion having a threaded region, a closing mechanism situated above the top portion of the body, an actuator in communication with the closing mechanism, a nut configured to attach to the threaded region, and a threaded hole extending into at least one of the bottom portion of the body or the nut.