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| Number | Title | Issue Date |
| 8167312 | Metal seal adjustable casing sub An adjustable casing sub having an outer housing, an inner housing insertable into the outer housing, and a ratcheting system for coupling the inner housing within the outer housing. An annulus is between a portion of the inner and outer housing, the annulus includi... | 05/01/2012 |
| 7416770 | Reinforcement ring A reinforcement ring, includes an annular coil spring with a core unit arranged inside to prevent deforming or twisting of the ring under load. The core unit is formed from a chain of interlinked elements, each having a male part and a female part; the male parts of... | 08/26/2008 |
| 7314085 | Well operations system A wellhead has, instead of a conventional Christmas tree, a spool tree (34) in which a tubing hanger (54) is landed at a predetermined angular orientation. As the tubing string can be pulled without disturbing the tree, many advantages follow, includin... | 01/01/2008 |
| 7255163 | Convertible rotary seal for progressing cavity pump drivehead A convertible rotary seal has a housing for receiving a polish rod. A mandrel is rotatably mounted in the seal housing and surrounds the polish rod. A wear sleeve surrounding the mandrel engages a primary seal. A secondary seal engages the mandrel and polish rod and... | 08/14/2007 |
| 7240727 | Armored stripper rubber An armored stripper rubber is provided that protects the drillstring bore of the stripper rubber from substrate infiltration, yet pivotally dilates to facilitate the passage of drillstring components through the bore while effectively maintaining a fluid-tight seal.... | 07/10/2007 |
| 7228915 | Device and method to seal boreholes Apparatus and methods are described that are particularly suited for creating a seal in a borehole annulus. In one embodiment, an outer surface 10s of an expandable conduit 10 is provided with a formation 20 that includes an elastomeric m... | 06/12/2007 |
| 7220067 | Cable splice protector The present invention provides a protector assembly and process for protecting a downhole connection of a line (e.g., fiber optic or electrical) from the wellbore environment. Inside the housing that provides protection from the wellbore environment is a subassembly... | 05/22/2007 |
| 7134504 | Expandable packer with anchoring feature An expandable packer or anchor is disclosed. It features a gripping device integral to or mounted in a sleeve over the mandrel. Upon expansion, a sealing element engages an outer tubular and the gripping device, such as wickers on slips, preferably digs into the out... | 11/14/2006 |
| 7083171 | Metal seal and attachment method for the same and tight-seal construction A metal seal of ring as a whole disposed between a first contact flat face portion and a second contact flat face portion parallel to each other. This metal seal has a middle base portion, a first contact convex portion, and a second contact convex portion. The firs... | 08/01/2006 |
| 7066927 | Vented seal having redundant sealing components A seal having a body and several bands extending away from the body. The bands extend around an axial portion of the body. In some embodiments, the bands project from and are formed integral with the body. For example, the bands can be rings. Two bands can be locate... | 06/27/2006 |
| 6948715 | Seal assembly with accumulator ring A seal assembly with an accumulator ring for protecting a seal from explosive decompression is disclosed. The accumulator ring and the seal are contained within a seal gland. The seal is made of a material that is susceptible to damage from explosive decompression. ... | 09/27/2005 |
| 6931776 | Apparatus for the section-wise autofrettage of gun barrels An apparatus for the section-wise autofrettage of gun barrels (22) by a hydraulic pressure generated inside the barrel. The apparatus (1, 1′, 1″) comprises a mandrel-shaped insert (2, 2′, 2″) inserted into the barrel (22) from the... | 08/23/2005 |
| 6926283 | Metal-to-metal sealing system An annular metal-to-metal sealing system comprises at least one metal member defining an annular sealing surface and an annular seal body which is comprised of a high strength metal material and which is positioned substantially concentrically relative to the annula... | 08/09/2005 |
| 6923254 | Washpipe apparatus Methods and apparatus for providing enhanced seal life of a swivel seal assembly by decreasing the effective differential pressure across a given rotating seal. The differential pressure is decreased by providing a pressurized fluid on the low-pressure side of the s... | 08/02/2005 |
| 6923261 | Apparatus and method for expanding a tubular A method of isolating a section of downhole tubing comprises: running a length of expandable tubing (20) into a tubing-lined borehole (12, 14) and positioning the expandable tubing (20) across a section of tubing to be isolated; deforming at lea... | 08/02/2005 |
| 6780939 | Low molecular weight hydrogenated nitrile rubber The present invention relates to hydrogenated nitrile rubber polymers having lower molecular weights and narrower molecular weight distributions than those known in the art. The present invention is also related to shaped articles containing hydrogenated nitrile rub... | 08/24/2004 |
| 6752397 | Redundant metal-metal seal A sealing assembly for protecting a downhole connection is disclosed. The sealing assembly includes independently energized metal—metal seals and a housing that prevents the energization of individual seals from affecting other seals. ... | 06/22/2004 |
| 6371487 | Gimbal and seal for the drivehead of a downhole rotary pump The invention relates to downhole rotary pumping arrangements and more particularly to drivehead gimbals and seals used in the driveheads of downhole rotary pumps. The gimbal and seal system described enables the wobble of a rotating shaft to be absorbed ... | 04/16/2002 |
| 6167963 | Removable non-metallic bridge plug or packer A composite packer or bridge plug includes substantially all nonmetallic components. The design allows the setting tool metallic components to be retrieved after the bridge plug is set. The slips contain flats with mating flats on the cones which extend t... | 01/02/2001 |
| 5975589 | Hydraulic coupling A hydraulic coupling employing a polymeric elastomeric sealing member to provide an excellent seal under pressure. The polymeric elastomeric seal additionally has high resistance to acids, alkalis, hydrocarbons, ketones, ethers, esters, alcohols and salt ... | 11/02/1999 |
| 5941530 | Unidirectional environment barrier seal for subsea wellhead equipment and valves A sealing arrangement for a subsea wellhead component is provided which comprises a primary seal to prevent leakage of internal pressure from within the wellhead component and a secondary seal surrounding the primary seal to prevent entry of ambient press... | 08/24/1999 |
| 5799949 | Annular chamber seal Internal and external metal-to-metal radially interfering seals are provided for an annular chamber. Typically, an annular chamber is used in tubular goods to be part of the hydraulic control circuitry, such as for operating subsurface equipment such as a... | 09/01/1998 |
| 5791657 | Seals containing composite non-extrusion springs A wellhead seal assembly for sealing between first and second pipe members comprises an annular elastomeric body having, in cross-section, a generally rectangular shape comprising a first flat radial surface, a second flat radial surface, an inner circumf... | 08/11/1998 |
| 5765834 | Sealing device This invention relates to a sealing device for sealing off an elongated body (1), such as a cable, pipe or umbilical, at its entrance into an aperture (7) of an apparatus, such as an offshore J-tube (8). The sealing device (2) consists of two substantiall... | 06/16/1998 |
| 5639227 | Seal arrangement for the drivehead of a downhole rotary pump A leakproof seal arrangement is disclosed for use in the drivehead of a downhole rotary pump, which pump is operated by a drive string suspended from the drivehead for rotation in a production tubing about a longitudinal axis, the drivehead having a bore ... | 06/17/1997 |
| 5507504 | Sealing device with c-shaped lips and central projection A sealing device for a sealing space defined by sealing surfaces of two elements (2, 6), preferably pipes or well rings consisting of concrete, comprises a sealing element (28). The sealing element is adapted to seal a section of the sealing space extendi... | 04/16/1996 |
| 5464063 | Well assembly metal seal 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... | 11/07/1995 |
| 5447026 | Hydraulic oil well pump drive system A hydraulic oil well pump drive system for driving an oil well sucker rod includes a master piston positioned within a master cylinder for axial displacement between first and second ends of the master cylinder. The master piston has a piston drive rod wh... | 09/05/1995 |
| 5409073 | Rotating head with elastomeric member rotating assembly A rotating head having a bowl assembly and a rotating assembly disposed in a bowl opening formed in the bowl assembly. The rotating assembly consists of an elastomeric member having a bearing wall formed thereon bearingly engaging a portion of the bowl as... | 04/25/1995 |
| 5358054 | Method and apparatus for controlling steam breakthrough in a well A method and apparatus for controlling the intrusion of steam (e.g. breakthrough) from a zone of a producing formation into a slotted liner of a gravel-packed, production well of a steam flood recovery operation. An assembly including a blank, scab condui... | 10/25/1994 |
| 5355961 | Metal and elastomer casing hanger seal 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 ... | 10/18/1994 |
| 5330201 | Sealing assembly A sealing assembly for sealing between two relatively rotatable cylindrical surfaces. The assembly comprises two seal parts (46, 48) disposed in a groove (40) in one of the surfaces so that one of said parts is disposed radially outwardly of the other. On... | 07/19/1994 |
| 5322137 | Rotating head with elastomeric member rotating assembly A rotating head having a bowl assembly and a rotating assembly disposed in a bowl opening formed in the bowl assembly. The rotating assembly consists of an elastomeric member having a bearing wall formed thereon bearingly engaging a portion of the bowl as... | 06/21/1994 |
| 5297805 | Sealing ring A sealing ring for a seal assembly used in oil field equipment including an elastomeric body and a reinforced face. The reinforced face is of molded polytetrafluoroethylene and is integral with the elastomeric body to provide improved pressure capability ... | 03/29/1994 |
| 5285853 | Casing hanger seal with test port A casing hanger seal has facilities to enable periodic testing from the exterior of the wellhead housing. The casing hanger seal has inner and outer walls separated by a cavity. An energizing member moves downward to force the inner and outer walls into e... | 02/15/1994 |
| 5224715 | Supported-lip low interference metal stab seal An improved metal-to-metal seal of a generally U shaped configuration which utilizes an enlarged seal portion on the interior and exterior of the inner and outer seal legs to effect an initial seal. The initial interference of the seal legs is maintained ... | 07/06/1993 |
| 5201835 | Wellhead seal with protective rib A seal member that locates between inner and outer tubular members has ribs for reducing the amount of sliding contact. The seal member is U-shaped, having inner and outer walls connected on one end by a base. Each wall has a sealing band protruding radia... | 04/13/1993 |
| 5193616 | Tubing hanger seal assembly 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 tubi... | 03/16/1993 |
| 5180008 | Wellhead seal for wide temperature and pressure ranges A wellhead seal for establishing and maintaining a seal between a wellhead and inner pipe element. The seal is an annular elastomeric body having an inner axial surface with a generally convex central portion for pressing against the inner pipe element su... | 01/19/1993 |
| 5167283 | Combination ball valve and annular pipe seal A diverter for a riser string between subsea well and offshore drilling rig utilizes a rotatable ball element. The ball element mounts in a tubular housing. The ball element has a passage through it which is coaxial with the riser when the ball element is... | 12/01/1992 |
