Abstract: A downhole tool 100 includes a closure seat 116, 176 for seating with a closure, such as a ball. Shear pins or other connectors temporarily limit axial movement of the closure seat which is initially housed within a restricted diameter portion of the central throughbore in the tool body. The closure seat may be lowered to engage a stop 108, 157, thereby positioning the seat within an enlarged diameter bore portion of the tool and allowing radial expansion of a closure seat to release the ball.

Abstract: A method is disclosed of connecting first and second bodies in a mechanical assembly at a desired connection location. An elongate connection structure is provided on the first body. The first body is installed, extending at least to the desired connection location. The first body is axially reduced, to terminate around the desired axial connection location. A second body is connected relative to the desired connection location to the first body using the connection structure. Further sub-assemblies may be installed, and electrically insulated from other parts of the mechanical assembly to protect against corrosion.

Abstract: A subsea well assembly includes a wellhead housing 50 having a cylindrical inner sealing surface and a tubular hanger 10 having a tapered external sealing surface. The running tool 30 includes a central stem 40 connected to the running string. A setting piston 72 is responsive to fluid pressure in the annulus about the running string, and has a radially outer surface and a radially inner surface each for sealing with the running tool body. Fluid pressure to set the seal assembly may be applied to the setting piston through an annulus about the running string, and may also act directly on an initially set seal assembly 20.

Abstract: A wellhead assembly with high pressure interface is provided. The wellhead assembly includes a tubing spool that connects the wellhead to a BOP and a casing hanger that is landed in the wellhead and connected thereto. The wellhead assembly further includes a gasket that is disposed between opposing ends of the tubing spool and casing hanger. A connector engages the wellhead and tubing spool forcing the opposing ends of the tubing spool and casing hanger together, which thereby applies a compressive load to the gasket, which in turn forms a fluid tight seal therebetween.

Abstract: An inner riser adjustable hanger and seal assembly are provided for applying tension to a casing string secured at a lower end within a well and supported at an upper end by a wellhead housing. The wellhead housing has a locking member on an inner surface thereof. A tensioning mechanism tensions the casing string and secures the upper end to the wellhead housing. A seal body locking member is radially moveable into engagement with the housing locking member to fix the axial position of the seal body relative to the wellhead housing. An upper seal assembly seals between the seal body and the wellhead housing, and a lower assembly seals between the seal body and the casing string. The casing string is tensioned without appreciable rotation of the hanger body or the upper and lower seal assemblies.

Abstract: A flow shut-off sleeve assembly adapted to be coupled to a subsea wellhead housing disposed within a conductor housing, which opens and closes at least one flow port in the conductor housing to annular fluid flow, is provided. The flow shut-off sleeve assembly includes an internal annular flow shut-off sleeve disposed around an exterior portion of the subsea wellhead housing and an external annular flow shut-off sleeve disposed around an exterior portion of the internal annular flow shut-off sleeve. The external annular flow shut-off sleeve is movable axially relative to the internal annular flow shut-off sleeve between an open position wherein the at least one flow port is open to annular fluid flow and a closed position, wherein the at least one flow port is closed to annular fluid flow. A subsea well assembly is also provided, which includes the flow shut-off sleeve assembly.

Abstract: A tieback connector for attaching a riser to a subsea production assembly is provided. The tieback connector includes a main body adapted to be coupled to the subsea production assembly having a central passageway sufficiently large to pass an end of the riser string therein and a connector positioner coupled to the main body, which is adapted to secure the tieback connector around a circumferential surface of a wellhead of the subsea production assembly. The tieback connector further comprises an aligning extension portion defined by a funnel-shaped tip, which aids alignment of the riser terminus during landing of the riser string onto the wellhead. The tieback connector secures the riser to the wellhead.

Abstract: A system and method for subsea drilling/completion. The system comprises a high-pressure riser extending from a semi-submersible platform to a subsea wellhead. A landing string extends along the insider of the riser, and has a surface blowout preventer and at least one subsea blowout preventer attached thereto. A tubing hanger running tool is run from the platform toward the wellhead. In one embodiment, hydraulic control for various functions of the tubing hanger running tool is communicated either through the tubing string or through the riser. In another embodiment, hydraulic control lines for the tubing hanger running tool extend from the platform to the tubing hanger running tool through an umbilical line, which may either run through the tubing string, inside the riser but outside the tubing string, or outside and alongside the riser.

Abstract: A subsea production system is disclosed. The subsea production system may comprise a well head, a tubing spool, a tubing hanger, an annulus, a production tree, and a bypass flow path.

Abstract: A subsea well assembly includes a wellhead housing 50 having a cylindrical inner sealing surface and a tubular hanger 10 having a tapered external sealing surface. The running tool 30 includes a central stem 40 connected to the running string. A setting piston 72 is responsive to fluid pressure in the annulus about the running string, and has a radially outer surface and a radially inner surface each for sealing with the running tool body. Fluid pressure to set the seal assembly may be applied to the setting piston through an annulus about the running string, and may also act directly on an initially set seal assembly 20.

Abstract: A tubing hanger is provided for suspending a tubing hanger from a wellhead housing. The tubing hanger body includes a production bore and an annulus bore, a valve opening inlet port, a valve closed inlet port, and a hydraulically operated ball valve to selectively open and close the annulus bore. An actuator sleeve surrounds the ball valve and is movable in response to fluid pressure between the open and closed positions.

Abstract: A tubing hanger is provided for suspending a tubing hanger from a wellhead housing. The tubing hanger body includes a production bore and an annulus bore, a valve opening inlet port, a valve closed inlet port, and a hydraulically operated ball valve to selectively open and close the annulus bore. An actuator sleeve surrounds the ball valve and is movable in response to fluid pressure between the open and closed positions.