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| Number | Title | Issue Date |
| 7237615 | Casing mandrel with well stimulation tool and tubing head spool for use with the casing mandrel A casing mandrel for an independent screwed wellhead includes a pin thread adapted for engagement with a box thread of a well stimulation tool lockdown nut for securing the well stimulation tool against the casing mandrel top end. A well stimulation tool and a tubin... | 07/03/2007 |
| 7150323 | Shoulder ring set on casing hanger trip A wellhead housing has a bore with a support shoulder, a ramp surface extending upward and outward from the support shoulder, and a recess extending upward from the ramp. A split, resilient load ring is carried in an initial position in the recess. A retractable and... | 12/19/2006 |
| 7066269 | Casing mandrel with well stimulation tool and tubing head spool for use with the casing mandrel A casing mandrel for an independent screwed wellhead includes a pin thread adapted for engagement with a box thread of a well stimulation tool lockdown nut for securing the well stimulation tool against the casing mandrel top end. A well stimulation tool and a tubin... | 06/27/2006 |
| 7040407 | Collet load shoulder In a subsea wellhead assembly, a collet ring assembly is used with a hanger for suspending a string of conduit in a subsea wellhead assembly. The ring assembly includes a collet that extends around an outer surface of the hanger. The collet has an upper portion that... | 05/09/2006 |
| 7040410 | Adapters for double-locking casing mandrel and method of using same Adapters for connecting to a double-locking casing mandrel of an independent screwed wellhead include a lockdown flange with an adapter pin, and a retainer flange that may be used with or without the adapter pin. The retainer flange has a top surface with circumfere... | 05/09/2006 |
| 7025145 | Tensioning arrangement for a subsea wellhead assembly A pre-tensioning arrangement for inner and outer elongate concentric members includes a load member which is axially movable in an actuating direction relative to the inner member and has an outer surface which tapers in the actuating direction, a laterally expansib... | 04/11/2006 |
| 7010889 | Riser support clamp for pipe riser or conduit A riser clamp mateable with a riser, wherein the riser clamp supports a column of the riser as material passes therein, and the riser clamp further covers or seals the opening in the partition formed through which the riser passes. The riser clamp comprises a pair o... | 03/14/2006 |
| 6905148 | Connector for securing conduits A connector for securing tubular members or conduits in sealed end to end relationship is disclosed. A split ring biased to an unlocked position is carried on the pin connection member in a recess. After the connection is made, the split ring is expanded through a w... | 06/14/2005 |
| 6695356 | Connector for securing conduits A connector for securing tubular members or conduits in sealed end to end relationship is disclosed. A split ring biased to an unlocked position is carried on the pin connection member in a recess. After the connection is made, the split ring is expanded ... | 02/24/2004 |
| 6609734 | Torus type connector A connector for the connection of pressure vessels utilizing toroidal surfaces to achieve a maximum of contact area sliding parallel to motion of locking segment when achieving high preload to minimize high stress contact points and the resultant wear whe... | 08/26/2003 |
| 6609731 | Connector A connector for connecting the lower tubular member of a tie-back to the upper tubular member of a subsea wellhead is disclosed as having a first sleeve carried about the upper member for axial reciprocation with respect thereto and extension over the low... | 08/26/2003 |
| 6367552 | Hydraulically metered travel joint Initially, a set of locking lugs lock an inner mandrel is locked in position with respect to an outer mandrel. Unlocking the travel joint is accomplished by applying a constant vertical or downward force on the tubing string. That vertical force is transm... | 04/09/2002 |
| 6138751 | Hanger assembly A hanger assembly comprising a tubular housing having an internal cylindrical bore provided with an annular recess containing a fixed, annular, downwardly tapering ramp, and, supported on the ramp, a split, radially contractible, wedge locking ring which ... | 10/31/2000 |
| 5984008 | Installable load shoulder for use in a wellhead to support a tubing hanger An installable load shoulder is used with a wellhead to support a tubing hanger by which tubing is suspended in a well bore, "tubing" being inclusive of any tubular product such as a string of tubing or casing as used in drilling and completing oil or gas... | 11/16/1999 |
| 5431453 | Pipe coupling arrangement A pipe coupling arrangement for coupling an end of a pipe section includes a coupling body having its open end, into which the end of the pipe section is inserted. An outer ring and a radially compressed inner ring are disposed in the open end of the coup... | 07/11/1995 |
| 5368335 | Contingency tieback adapter A tieback system for a subsea well employs a tieback member that can be utilized in the event tieback threads in the casing hanger become damaged. An annular groove is formed in the bore of the wellhead housing above the casing hanger. The tieback member ... | 11/29/1994 |
| 5327965 | Wellhead completion system 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 g... | 07/12/1994 |
| 5259459 | Subsea wellhead tieback connector A subsea wellhead tieback connector actuated solely by axial motion to achieve connection to and disconnection from the wellhead. The connector includes interconnected inner and outer bodies, a split lock ring surrounding the inner body, and an energizing... | 11/09/1993 |
| 5247996 | Self preloading connection for a subsea well assembly A subsea well assembly has a tubular inner housing that locates within a tubular outer housing. A locking element carried by the inner member is biased outward for engaging a groove provided in the bore of the outer member. The inner member has a metal co... | 09/28/1993 |
| 5222555 | Emergency casing hanger system 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 car... | 06/29/1993 |
| 5209521 | Expanding load shoulder A self-actuating, releasable weight support system includes a structural support member with a central bore therethrough. The bore has a recessed load support surface therein and a no-go shoulder on the inner periphery of the load support surface. A weigh... | 05/11/1993 |
| 5127478 | Casing suspension system 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 diamete... | 07/07/1992 |
| 5066048 | Weight set connecting mechanism for subsea tubular members An improved mechanism for connecting tubular members in a subsea well in which the members are locked together in a preloaded condition. In the preferred form of the invention the loading is provided by a series of fingers mounted on the inner tubular mem... | 11/19/1991 |
| 5060985 | Location of tubular members A landing ring (60, 96) for use in stacking hangers (14, 40, 80) in a wellhousing 10. Each landing ring can be connected to a downwardly facing landing shoulder on a layer in such a way as to allow relative lateral movement between the ring and layer. The... | 10/29/1991 |
| 5044432 | Well pipe hanger with metal sealing annulus valve A well pipe hanger with a metal sealing annulus valve comprising an axially positionable annular metal seal element with a pair of radially spaced annular sealing surfaces that cooperate with annular metallic sealing surfaces on adjacent well elements to ... | 09/03/1991 |
| 5026097 | Wellhead apparatus There is disclosed apparatus for use in suspending an inner case within an outer casing of an offshore well at the ocean floor, which includes an outer body adapted to be connected to the outer casing for lowering therewith into a landed position at the o... | 06/25/1991 |
| 5020593 | Latch ring for connecting tubular members A device for releasably locking an inner member within the bore of a tubular outer member holds load in upward and downward directions. The inner member has a grooved profile on its exterior. The outer member has a grooved profile in its bore. A split lat... | 06/04/1991 |
| 4969519 | Subsea hanger and running tool An improved subsea tubing hanger having a body with an external shoulder for landing on a seat within a subsea wellhead housing, locking means carried by the hanger to engage the housing to lock the hanger in landed position, which locking means includes ... | 11/13/1990 |
| 4919460 | Wellhead casing hanger support mechanism A supporting mechanism for a casing hanger improves the load withstanding ability. The casing hanger is located in a wellhead housing. A recess is formed in the bore of the wellhead housing with an upward facing shoulder extending into the bore. An insert... | 04/24/1990 |
| 4909546 | Tension lock multibowl wellhead A mechanism for locking a casing in a stationary support has an intermediate element which can move elastically in a receptacle of the support. The receptacle has upper and lower conical flanks. Conical inner grooving of the intermediate element has conic... | 03/20/1990 |
| 4903992 | Locking ring for oil well tool A connection assembly secured a running tool into a tubular casing hanger. The connection assembly includes a frusto-conical threaded section on a running tool and a nose section of cylindrical shape located below the threaded section. The casing hanger h... | 02/27/1990 |
| 4887673 | Technique for completing shallow wells with tension packer A bowl-slip assembly is used to complete shallow wells having a tension set hold down device such as a packer or tubing anchor. The bowl includes a trap door which is opened to allow the bowl to pass around the tubing string and rest on an underlying well... | 12/19/1989 |
| 4886121 | Universal flexbowl wellhead and well completion method A new wellhead housing structure which utilizes identical units of a unique wellhead housing of selected internal diameter and pressure rating. Each wellhead housing utilizes a new flexible bowl ("flexbowl") hanger support ring which may be installed and ... | 12/12/1989 |
| 4836579 | Subsea casing hanger suspension system A well casing suspension system comprising a casing hanger assembly with an expandable, multiple shoulder, split load ring that is radially expanded into supporting position in a mating groove in a wellhead housing by contact with a previously installed a... | 06/06/1989 |
| 4826216 | Well housing and landing shoulder An improved well structure such as a well housing on which a casing hanger is to be landed which housing includes a high strength landing shoulder insert which allows the housing to support the casing hanger, its casing and the heavy loads associated ther... | 05/02/1989 |
| 4823919 | Slip construction for supporting tubular members A support construction including a supporting bowl to receive a plurality of circumferentially disposed slips to engage and support a tubular member. The slips include at least one pair of slip inserts that are carried in axial grooves provided on the inn... | 04/25/1989 |
| 4751968 | Wellhead stabilizing member with deflecting ribs A metal support ring is located between a housing and a wellhead for reducing bending movement of the wellhead relative to the housing. The support ring has a plurality of circumferentially extending ribs for engaging the bore of the housing. The ribs are... | 06/21/1988 |
| 4730851 | Downhole expandable casting hanger A hanger assembly 10 for suspending an inner pipe string 32 within an outer casing 16 from a particular location therein. The hanger assembly includes a hanger body 30 and an expandable locking assembly 46 comprised of a plurality of latching fingers 77 s... | 03/15/1988 |
| 4714111 | Weight/pressure set pack-off for subsea wellhead systems A pack-off assembly (P) for a wellhead system (W) comprising of a pack-off nut (36) with a tapered pack-off (40). The pack-off nut (36), in one embodiment, contains an internally tapered split ring (44) having multi-start threads (46) for engaging similar... | 12/22/1987 |
| 4697828 | Wellhead body lockdown and method for engaging same Preloaded connection for supporting an annular body from an annular suspension joint. The connection includes an actuating ring, a split locking ring and a retaining nut which are positioned between the annular body and suspension joint. The connection is... | 10/06/1987 |
