Abstract: A well has a metal seal for sealing between tubular inner and outer members. The seal has a solid metal body with an inner wall and an outer wall that are cylindrical. The radial thickness of the seal is initially greater than the pocket between the inner and outer tubular members. Also, the inner diameter is greater than the outer diameter of the inner tubular member. The seal is radially deformed in an interference fit.

Abstract: A tubing hanging set for hanging, locking and sealing a submarine oil well includes a tubing hanger which is seated on an upper internal surface of a connection sleeve which in turn is seated on an internal surface of a casing hanger. The tubing hanger is provided with passageways extending therethrough and tubular extensions are connected in the passageways and to tubing passing through a double hydraulic packer. The lower end of one of the tubes passing through the packer extends into a oil producing zone and the other tube passing through the packer is in communication with an annular chamber between the other tubing and the casing. An installation tool is also provided which can be detachably connected to the tubing hanger for carrying out a method of installation of the tubing hanging set in a wellhead housing.

Abstract: A seal for a wellhead housing employs a locking groove. The seal is of a U-shape, having an inner and outer radially spaced apart legs. An energizing ring is stroked downward to force the legs apart to cause them to seal between the wellhead housing in the conduit and the wellhead housing. At least one groove is located on one side of the energizing ring, with the groove being of a saw-toothed shape to allow entry but to resist upward movement of the energizing ring. In a metal version of a seal, the groove is located on the exterior of the energizing ring so as to allow some axial movement of the inner leg of the seal relative to the energizing ring. In a second version, the seal is of plastic.

Abstract: A method of installing a wellhead component such as a tubing hanger or tree cap utilizes hydraulic pressure to move the component downward. A blowout preventer is connected to the production tree. The component has a primary metal seal and an elastomeric installation seal. The component is lowered on drill pipe through the blowout preventer into the tree bore with the installation seal sealingly engaging the bore. The primary seal is in a run-in position prior to setting. The operator closes the blowout preventer and pumps liquid through a kill line into the annular chamber below the blowout preventer. This causes the component to move downward, deforming the primary seal into the sealing engagement with the bore and the component.

Abstract: A surface wellhead system for a subsea well utilizes a two-piece casing hanger. The casing hanger has an inner member that secures to a string of casing that extends from the sea floor to a surface casing head. The outer member of the casing hanger is axially adjustable relative to the inner member and will hold tension in the casing. The outer member lands on a load shoulder in the casing head. An annulus outer seal seals between the exterior of the outer member and the bore of the casing head. An inner seal seals between the inner member and the bore of the outer member.

Abstract: A tubing hanger (2) is suspended in a spool (1) by a composite load support ring (7,8). Upon running-in, the hanger expands the ring into engagement with complementary grooves (34) in the spool wall. By making the load support ring from individual split rings (7,8), a radially large bearing area is provided for supporting the hanger and/or a seal, whilst enabling an appreciable expansion of the ring without it yielding beyond its elastic limit.

Abstract: A liner hanger assembly structurally interconnects a casing within a bore hole and a tubular liner suspended from the casing. The hanger body includes a plurality of circumferentially spaced piston bores. A plurality of slips are provided circumferentially about, the hanger body for gripping engagement with an internal surface of the casing. A plurality of pistons are each housed within a respective piston bore and are movably responsive to internal pressure within the hanger body. A sleeve is axially movable with respect to the hanger body in response to axial movement of the plurality of pistons. The sleeve is interconnected with each of the plurality of slips to cause radially outward movement of the slips in response to movement of the pistons. The liner hanger assembly has a high fluid pressure rating for ensuring reliable gripping engagement with the casing, yet creates a comparatively low fluid restriction in the annulus between the casing and the liner.

Abstract: A locking mandrel is provided for use in downhole assembly and comprises a cylindrical body (12) having an annular series of openings (20) in which locking keys (21) are movably positioned, the keys (21) being biased radially inwardly, and an inner mandrel (13, 14) for moving the keys (21) from a withdrawn primed condition to an extended set position. Additionally the body (12) includes a series of movable no-go members (22) below the keys (21) which are extended in the primed condition so as to be engageable with a no-go ring (R2) on a downhole tubing string to axially arrest the body.

Abstract: A wireline set baffle for positioning in a well casing after the well casing has already been placed in a wellbore. The apparatus comprises a baffle and a setting or running tool engaged with the baffle and adapted for positioning the baffle at a predetermined location in the wellbore. In one embodiment, a lock ring may be used to lock the baffle to the casing at a predetermined location, and in another embodiment, collet fingers on the baffle may be used to engage the casing. The lock ring may be initially held in a non-engaging position by a lock ring retainer or shear pins. The collet fingers may be initially held in a non-engaging position by a cover which is disengaged from the collet fingers by a blasting cap. Engagement may be with an inner surface of the casing or a recess defined at a casing joint. A method of using the wireline set baffle is also disclosed.

Abstract: A lock member (10) is disclosed for securing to a lock structure (14) in a conduit. The lock member (10) comprises a housing (24), a shoulder (16) on the lock structure (10), a locking device (26) movably mounted on the housing (24) for movement between a first retracted position and a second extended position in which the locking device (26) enters a corresponding locking recess (30) in the lock structure (14). The shoulder (16) of the lock member (10) is movably mounted on the housing (24) between a first position in which, in use, the shoulder (16) bears upon the shoulder (18) of the locking structure (14) and the locking device (26) when in the extended position is disengaged from the surfaces of the locking recess (30) of the lock structure (14). When the shoulder (16) of the lock member (10) is in the second axial position, the locking device (26) bears upon a surface of the locking recess (30) so as to bear at least a portion of any load applied to an end of the lock member (10).

Abstract: A wear bushing assembly for a subsea well to protect a casing hanger during drilling latches by use of a collet. The wear bushing includes a tubular member which lands on the upper end of the casing hanger. A metal collet secures to the wear bushing. The collet has slots in it so as to allow it to radially deflect. The collet has an external shoulder which snaps into and latches in a profile formed in the casing hanger. The collet may serve as a protective portion of the wear bushing.

Abstract: A casing hanger seal assembly utilizes a deformable metal body and elastomeric seal rings which are O-rings. The seal rings are located in grooves in unbonded condition in the metal body. The inner wall of the metal body is tapered, matching the taper on the exterior of the casing hanger. The inner wall is sized so that it will be deformed outward as the body of the seal assembly is moved further downward. This causes the seal rings on the outer diameter of the body to engage the wellhead housing inner cylindrical wall. In a second version, the seal ring on the outer wall of the body is initially fully recessed. A deformable rib is located inward from the base of the groove. The rib presses the base of the groove outward.

Abstract: A seal for an oil well apparatus has reinforcing rings embedded within the seal. The seal is elastomeric. The apparatus has an energizing device that deforms the seal to cause it to move radially outward to a set condition. The reinforcing ring does not expand during this radial movement. The reinforcing ring is preferably a cable and is located near the inner diameter of the seal. The seal may also have anti-extrusion rings at the outside corners, which are flexible coil springs. Each anti-extrusion ring is a coil spring with a core of material that has a hardness greater than the hardness of the body of the seal.

Abstract: An internal lockdown will lock a tubing hanger in a wellhead housing. The tubing hanger has a conical cam surface formed on the exterior. An internal profile is located in the bore of the housing in alignment with the cam surface. A landing sub secures to a threaded bore of the tubing hanger and protrudes above. A carrier ring mounts to exterior threads formed on the landing sub. The carrier ring carries a set of segmented dogs. After the tubing hanger lands, the landing sub is unscrewed relative to the tubing hanger and carrier ring assembly. Then, the landing sub is lowered, pushing the dogs out into engagement with the profile.

Abstract: A non-extrusion device for split annular well casing and tubing hanger compression seals has a flat annular body having truncated, radially-split cone portions forming through holes for receiving pins or bolts and for guiding a compressed elastomer seal between inner and outer tubing structures along a radial direction to prevent axial extrusion of the seal.

Abstract: A suspension hanger for suspending liner pipe inside a well casing for purposes of relining or repair is disclosed having a top annular member to mount on the output end of the casing and a bottom annular member for seating a string of liner pipe. The bottom member is suspended from the top member by suspension strips. The length of the devise and therefore the depth of suspension of the liner pipe can be varied by adding or deleting suspensions strips.

Abstract: A seal apparatus is provided for use in a subterranean wellbore having a wellbore tubular disposed therein. The wellbore tubular defines a wellbore surface. The seal includes a number of components which cooperate together. A conveyance tubular is provided, which is positionable within the subterranean wellbore at a selected location relative to the wellbore surface. A sealing ring is provided, and disposed about at least a portion of the conveyance tubular. The sealing ring has a first surface proximate the conveyance tubular and a second surface which is removed in distance from the conveyance tubular. The second surface defines a sealing surface, and includes a plurality of portions, with selected ones of the plurality of portions of the sealing ring extending radially from the conveyance tubular in at least one radial dimension. The selected portions define at least one metal seal point for selectively and sealingly engaging the wellbore surface.

Abstract: A hanger (3) is suspended and sealed within a wellhead housing (5) by means of a landing ring which engages teeth (8) on the hanger, and a sealing device consisting of wedge rings (15 and 16) which seal respectively against the teeth (8) and the wall of the housing (5).

Abstract: A method is provided for securing a wellbore tool assembly to a wellbore tubular member, which includes a number of method steps. The wellbore tubular member is provided, and defines a surface with a substantially cylindrical shape having a selected tubular diameter. A wellbore tool assembly is likewise provided, and includes a plurality of ring-shaped components, with at least one ring-shaped component defining a cylindrical surface having a selected ring diameter which differs from the tubular diameter of the wellbore tubular member. A plurality of radial groove members and radial land members are formed on at least one of the cylindrical surface of the wellbore tubular member and the cylindrical surface of the at least one ring-shaped component of the wellbore tool assembly. The wellbore tubular member and the at least one ring-shaped component of the wellbore tool assembly are urged to differing thermal conditions to cause the tubular diameter and the ring diameter to become substantially equal.

Abstract: A well completion system utilizes a seal which carries its own load ring. The seal is lowered into the bore of a wellhead housing around a tubular member. The seal carries a split load ring, which once positioned will move outward into engagement with a groove formed in the wellhead housing. A locking assembly will lock the seal to the wellhead housing. The locking assembly has a casing lock ring which will secure to the upper end of a section of casing, if the casing has been cut due to an emergency stuck condition. A tubing hanger lands over the locking assembly. The tubing hanger is retained by an actuating ring and lock ring that are independent of the tubing hanger seal.

Abstract: Subsea wellhead equipment is disclosed as comprising a housing including a main body of a first material having an internal cavity thereabout and a weld body of a material having a considerably greater yield strength than that of the main body formed integrally with the main body within the cavity to provide an upwardly facing seat in the housing bore, and a hanger including a main body and a ring of a material having a considerably greater yield strength than that of the main body and carried by the main body in a position to provide a downwardly facing shoulder engageable with the seat to support the load of the hanger therefrom.

Abstract: The improved wellhead system includes a wellhead housing with an internal annular shoulder having a plurality of removed arcs to form an interrupted support shoulder. A casing hanger is provided with an external annular shoulder having a plurality of removed arcs which correspond with those on the wellhead housing. In a first orientation, the removed arcs of the casing hanger shoulder align with the arcs of the support shoulder in the wellhead housing to allow the casing hanger to pass through the wellhead housing or the wellhead housing to be lowered below the casing hanger. In a second orientation the remaining shoulder arcs of the casing hanger align with the support shoulder arcs to support the casing hanger. The casing hanger also includes a thread for attaching a tool whereby the casing hanger and casing attached thereto can be tensioned. An alternate embodiment of the improved wellhead system includes a wellhead housing with an internal support groove.

Abstract: A rotation release apparatus is provided for use in a wellbore tool to selectively couple a first wellbore tool member to a second wellbore tool member until the wellbore tool is lowered to a selected depth within the wellbore. The rotation release apparatus includes a coupling member secured to the first wellbore tool member, and a latch member secured to the second wellbore member. A cam member is secured to the coupling member to release the latch member from the coupling member when the wellbore tool is rotated about a longitudinal axis. The rotation release latching apparatus may be operated to couple the latch member to the coupling member by axial movement of the wellbore tool along a longitudinal axis.

Abstract: A casing or tubing hanger has a metal seal which also incorporates a locking device which locks the seal to the wellhead housing. An annular recess is formed in the bore of the wellhead housing. The seal has an energizing ring that moves downward to set the seal. A split lock ring is carried by the assembly and moves between a contracted position to an expanded position located in the wellhead housing recess. A wedge ring is carried above the lock ring by the energizing ring. The wedge ring moves with the energizing ring and has a tapered surface that engages the lock ring to push it to the expanded position when the energizing ring moves to the lower position. The lower portion of the wedge ring has a thickness that is selected so as to allow the lower portion to deflect once the lock ring is in an expanded position. This allows the energizing ring to continue downward movement if necessary to fully set the seal.

Abstract: A monobore completion system where the well is completed using a tubing conveyed perforating completion system having an automatic gun release and support for the tubing conveyed perforating guns.

Abstract: There is disclosed wellhead apparatus for use in suspending a pipe string within the bore of a housing of the wellhead. The apparatus includes a slip bowl landed on a seat in the bore and a slip assembly supported within the slip bowl in a retracted position which permits the bowl and slip assembly to be lowered into landed position within an annular space between the pipe string and bore of the housing by a series of elongate rods extending within the annular space and adapted, upon rotation in one direction, to force the slip assembly downwardly and inwardly into engagement with the pipe string, and thereby suspend the weight of the pipe string from the slip assembly, and upon rotation in the opposite direction, to permit them to be released from the slip assembly and removed from within the annular space.

Abstract: There is disclosed wellhead apparatus in which a pipe string is suspended within the bore of a housing and the annular space between the bore and the outer wall of the pipe string or a mandrel-type hanger from which the pipe string is suspended is closed by a seal assembly. The seal assembly is lowered into the annular space on a tool so as to close the same as seal rings carried about the outer and inner sides of the body are energized into sealing engagement with the bore of the housing and the outer wall.

Abstract: There is disclosed subsea well equipment in Which an inner wellhead housing is lowered into and landed in the bore of an outer wellhead housing in order to install an inner casing string suspended from the inner housing within an outer casing string to which the outer housing is connected. The inner housing is locked down in the bore of the outer housing by a locking part on the inner housing which is forced into a locking recess in the bore in order to preload the connection between the housings. An assembly releasably connectable to the inner housing is provided for lowering the inner housing in the landed position and then locking it down within the bore of the housing in response to manipulation of a pipe string from which the assembly is suspended.

Abstract: An improved subsea tubing hanger having a body with an external shoulder for landing on a seat within a subsea wellhead housing, locking ring carried on the hanger to engage an interior recess of the wellhead housing with an actuator ring for setting the locking ring. A preloading mechanism includes a biconical radially movable split ring hydraulically actuated by an axially movable conical ring cooperates with the locking ring to prevent any movement of the tubing hanger when engaged.

Abstract: A wellhead housing a supports a string of casing in tension by using a load ring. The load ring mounts to the exterior of a casing hanger which secures to the upper end of the string of casing. The load ring is split, resilient and outwardly biased. The load ring is retained during the running of the casing. The running tool then releases the load ring to spring outward to support the load. The load ring has wickers on its exterior that mate with wickers in the interior of the bore.

Abstract: Device for protecting wells from the risks of corrosion and deposits due to the nature of the fluid produced or present in the well. It is formed of a steel support casing (2), associated with a composite material production string (3), with a free annular space (6) particularly for the injection of inhibiting agents without stopping working. The string (3) is laid on the casing (2) via a device (4) which may be lowered at the same time as the string (3) and which has openings (13) ensuring the hydraulic continuity of the annular space (6). The device is particularly well adapted to wells conveying fluids which are aggressive with respect to traditional steel casings.

Abstract: An emergency casing support utilizes a conventional casing hanger. Casing hanger lands on a wellhead housing internal landing shoulder. The emergency support secures to the lower end of the casing hanger. The emergency support has a body which carries a slips bowl. Body also carries a seal for sealing between the casing and the body. A sleeve nut is engaged by a setting tool lowered through the casing hanger into the body. The sleeve nut when rotated causes the bowl to move upward relative to the slips and also energizes the seal.

Abstract: An emergency casing hanger can be lowered over casing collars and into a wellhead housing to support a string of casing. The casing hanger has a slip bowl which is slotted so that it can be radially expanded to insert over the casing collar. Slips are carried in the interior of the bowl for gripping the casing once the slip bowl is in position. The running tool has an inner sleeve that holds the slips in a retracted position and holds the slip bowl in an expanded position until the slip bowl clears the collar. Once the running tool has been removed, a honing tool is then lowered over the casing. The honing tool has honing stones mounted in a housing and biased inward for smoothing the exterior of the casing to receive a seal.

Abstract: A tubing hanger assembly having a metal-to-metal seal assembly for sealing the annulus between the tubing hanger assembly and an outer casing hanger assembly. The metal-to-metal seal assembly includes a static metal-to-metal seal for sealing with the tubing hanger assembly and a dynamic metal-to-metal seal for sealing with the casing hanger assembly. The static metal-to-metal seal sealingly engages the body of the tubing hanger assembly as a part of the factory assembly procedure. Thus, the static metal-to-metal seal may be tested at the factory and replaced if leakage is detected. The dynamic metal-to-metal seal has a non-sealing position when run into the well and a sealing position upon actuation downhole. The metal-to-metal seal assembly includes actuation means engageable with the outer casing assembly that actuates the dynamic metal-to-metal seal from the non-sealing position to the sealing position.

Abstract: A liner hanger and setting tool in which the liner hanger has an expander cone with a rotational clearance space relative to a suporting member and a low friction contacting surface for alleviating binding and frictional forces on the supporting member and where the liner hanger has spaced apart spline housings which cooperate with spline keys on a setting tool to determine rotational torque prior to and during cementing operations and where the release of the setting tool from the liner hanger can be determined prior to cementing.

Abstract: An all-metal, well annulus packoff assembly for establishing a high pressure, corrosion resistant metal-to-metal seal between a wellhead housing and a casing hanger, including an annular metallic seal element having a generally upstanding U-shaped cross section that is adapted for non-rotational sequential setting against the hanger and the housing.

Abstract: The casing suspension system includes a hanger having a load transfer mechanism and a finding/latching mechanism for finding, latching, and transferring load to an outer casing. The load transfer mechanism includes a ring disposed within a reduced diameter portion around the hanger. The ring includes a plurality of load bearing elements extending downwardly with the load bearing elements having a plurality of external teeth. The load bearing elements include an upwardly facing convex annular shoulder which engages a mating downwardly facing concave annular shoulder on the hanger. A spring retainer is disposed around the lower end of the load bearing elements to bias the load bearing elements inwardly. The hanger also includes a spring tube disposed below the load transfer ring. The spring tube includes a plurality of integral gates having keys. As the hanger is lowered into the well, the spring retainer maintains the load bearing elements in the "in" position.

Abstract: The present invention relates to an improved seal assembly for sealing between the interior sealing surface of a well housing and the exterior sealing surface of a hanger landed within the well housing and includes a seal body having a pair of outer lips diverging outwardly for sealing against the housing interior sealing surface and an interior series of annular ridges which have a diameter smaller than the outer diameter of the hanger exterior sealing surface, an upper energizer and a lower energizer for coacting with said lips to move the lips into sealing position and to store the energy of setting to ensure sealing engagement of the lips. In some forms of the invention the energy is stored by virture of the lips being of a relatively low yield stength material as compared to the energizers which have a higher yield strength. Also, structure is provided in some of the forms of the invention to store both radial and axial lip loading forces.

Abstract: A running tool for lowering, landing and setting a well structure, such as casing hanger and a packoff has an elongated tubular body in which are mounted a plurality of locking dogs that releasably lock a casing hanger to the tool, a plurality of packoff running pins for releasably locking a packoff to the tool, and a plurality of packoff retrieval pins to engage a packoff in a wellhead housing and secure it to the tool for retrieval from the housing. The locking dogs are cammed radially from the tool body into their hanger engaging position by an actuator sleeve, and the running pins and retrieval pins are spring-biased in a radial direction towards their packoff engaging positions and releasably held in their retracted positions by retraction shafts in the tool body.

Abstract: An apparatus and method for supporting and sealing a string of casing in a well utilizes the weight of the casing to form the seal. A tubular housing locates at the surface of the well. A seal sleeve is placed on a landing shoulder in the bore of the housing. A suspension mandrel connects to the upper end of the string of casing. The mandrel has an external tapered surface that engages an internal tapered surface and a seal sleeve. This creates a wedging action which moves the seal sleeve radially outward to seal against the bore of the housing. The weight of the string of casing pulls the mandrel down in the seal sleeve to cause this wedging action.

Abstract: A wellhead assembly comprising housing (1), an outer casing hanger (20) and at least one inner casing hanger (22,24) for suspending casings concentrically into a well. Each casing hanger (20,22,24) is provided with an external supporting shoulder (26,40,60), the external supporting shoulder (26) of said outer casing hanger (20) being supported by an internal shoulder (11) formed on the central bore (9) of the housing (1), the external supporting shoulder (40,60) of each inner casing hanger (22,24) being supported by an internal shoulder (28,42) formed on the inner surface of a surrounding casing hanger. Annular space (32,46,64) formed around the upper end of each casing hanger (20,22,24) are sealed with a metal-to-metal seal (76, 78, 79) or with an annular central member (104).

Abstract: An oil tool release joint with a top sub that has a pin end which inserts into an opening in a bottom sub provides an alternative remote tool for separating pipe string segments after rotation. The subs are held together by shear pins which are wedged through holes in the bottom sub into recesses in the top sub. The bottom sub has uphole extending splines that engage slots in the top sub when the subs are connected. The splines and slots translate rotational motion from one sub to the other. The joint releases upon the application of a force sufficient to shear the shear pins either by hydraulic pressure in the drill string, an upward pull on the top sub or both. A guide ring encircles the uphole ends of the splines to guide material into the bottom sub when the joint is separated.

Abstract: A liner hanger assembly is disclosed for setting within a casing conduit and carrying a liner string therebelow. The assembly has slip elements for gripping the casing with each of the slip elements having symmetrically angled teeth such that only one set of slips may be used to anchor the hanger and liner in position against relative longitudinal movement in either direction subsequent to setting. The apparatus is hydraulically settable and provides for application of workstring load to the apparatus to direct additional load in excess of that required to set the slips in anchoring engagement. The housing of the apparatus and the liner therebelow also may be rotated by the tubular workstring subsequent to setting without effecting rotational movement of the slip elements.

Abstract: A hanger comprising two tubular sections, one partially received within the other, one section having a serrated surface and the other section retaining at least one detent whereby the axial length of the hanger is adjustable. This arrangement obviates the disadvantage in the conventional tie-back method of sub-sea wellhead completion wherein it is necessary to cut and dress the casing after pulling tension in the casing string.

Abstract: A subsea well has tieback facilities for further sidetrack drilling. The well has an inner string casing hanger with an outer hanger portion and an inner hanger portion. The inner and outer hanger portions are latched together at the surface and lowered simultaneously. The inner casing string secures to the inner hanger portion. The tieback assembly includes an intermediate tieback conduit that extends into the bore of the outer hanger portion. An inner tieback conduit extend into the bore of the inner hanger portion. For later sidetrack drilling, the inner tieback conduit is pulled upward to unlatch the inner hanger portion from the outer hanger portion, retrieving the inner casing through the intermediate tieback conduit.

Abstract: A hydraulic casing hanger and packoff installation tool includes a central tubular member with a drill pipe upper connection and an annular chamber at the lower end thereof with a pair of concentric axially movable pistons mounted therein. A plurality of fluid passages are positioned in the wall of the tubular member and extend from the piston annular chamber to the middle portion of the tubular member where it exits. The pistons have a lower tubular extension which carries releasable latching mechanism which connects the tool to the packoff to be installed and transmits the axial force of the pistons to the packoff. A drill pipe stinger extends through the annular chamber with a releasable latch mechanism mounted on an enlarged lower portion. The releasable latching mechanism connects the tool to the casing hanger for lowering the casing and hanger into the well bore.

Abstract: There are disclosed several embodiments of wellhead equipment wherein a seal assembly is installed within a frusto-conically shaped space between the bore of a first wellhead member and a conically shaped surface about a second wellhead member to close same. In one embodiment, the first member is a casing hanger landed within the bore of a subsea casing head, the second member is a tubing hanger within the head, and the seal assembly closes off a space between the bore of the casing hanger and the outer surface of the tubing hanger. In another embodiment, the first member is a surface casing head, the second member is a tubing hanger landed within the bore of the head, and the seal assembly closes off a space between the bore and hanger.

Abstract: A setting tool for a liner hanger in an oil well completion system wherein the setting tool mechanism incorporates structure for manipulating a liner prior to and subsequent to hanging the liner hanger in a well casing. Prior to setting the liner hanger the setting tool release nut is locked to a liner hanger by a releasable lug interconnection. After hanging the liner hanger, the lug interconnection is released and rotation of the setting tool mandrel uncouples the coupling nut from the liner hanger to release the setting tool from the liner hanger and further rotation of the coupling nut locks the coupling nut to the clutch housing so that the liner can be rotated after it is hung in a well casing.

Abstract: The tubing hanger seal assembly of the present invention includes a metal to metal seal that is energized from above by a drive sleeve. The drive sleeve is threaded to the outside of the tubing hanger and as it is rotated downward, engages a load ring which in turn energizes the metal to metal seal by compressing it between the tubing hanger and tubing head. In addition, the invention includes a split ring which is forced into a notch by the drive sleeve in the inside of the tubing head to prevent the seal from being blown-out by upward pressure.

Abstract: A well tool assembly for running a casing hanger and a packoff into a wellhead housing during a single trip into the well, comprising a tubular inner mandrel, a locking mandrel, an outer annular body surrounding and rotatably connected to the inner mandrel, an outer sleeve surrounding the outer body, and means to prevent relative rotation between the outer body and the locking mandrel.