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| Number | Title | Issue Date |
| 7419000 | Apparatus and method for securing pipes An apparatus for holding in place a first casing while a second casing is connected to the first casing, including an annular clamp made up of three segments hingedly fit together to form a ring. The inner surface of each segment includes an insert within a dovetail... | 09/02/2008 |
| 7137651 | Fluid piping systems and pipe spools suitable for sub sea use A fluid piping system and pipe spools are provided. The fluid piping system has at least one pipe spool. The pipe spool has an inner wall and an outer wall with at insulating area defined at least in part by the inner and outer wall. The insulating area of the pipe ... | 11/21/2006 |
| 7111688 | Clamping well casings A clamp for clamping two concentric tubes, typically two concentric tubes in an oil or gas well. The clamp has two axially movable tapered components which can be pulled over one another in an axial direction to provide a contraction of internal diameter which grips... | 09/26/2006 |
| 6921090 | Diaphragm for sealing openings in pressure vessels An improved diaphragm for use with a gasket to prevent leakage of a pressurized fluid. The diaphragm has an internal groove which uses strong spring back and the pressure of the fluid to increase the gasket seating load, thereby providing a self-energizing seal whic... | 07/26/2005 |
| 6471439 | Slips for drill pipes or other tubular members The present invention relates to improvements in drill slip assemblies for use in holding a drill pipe or other tubular member in a vertical position above or within a wellbore. The invention comprises a plurality of slip segments assembled in a slip bowl... | 10/29/2002 |
| 6264395 | Slips for drill pipe or other tubular goods Slip assemblies are provided for gripping drill pipe or other tubulars such that the load is distributed along the length of the dies of the slip segments rather than being concentrated at the lowermost dies within the slip segments. The load is distribut... | 07/24/2001 |
| 5655606 | Running tool for installing a wellhead load shoulder A running tool is used to install a shoulder ring within a groove located in a wellhead housing after the wellhead housing has been installed. The running tool has a locator member which lands on a locator shoulder. A carrier collet which carries the shou... | 08/12/1997 |
| 4957313 | Emergency suspension system for drill casings The invention provides an emergency suspension system for use particularly with drill casings in a wellhead. The system, which is intended to surround the casing, comprises an annular bowl member (6) having an internal tapered annular space (16) which red... | 09/18/1990 |
| 4936382 | Drive pipe adaptor An adaptor assembly for attaching equipment to a casing head by means of pipe slips or other means of attachment integrated with the assembly, and having an elastomeric seal to contain leakage.... | 06/26/1990 |
| 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 |
| 4691791 | Knurled drill stem The invention disclosed herein concerns a drill stem intended for sinking shafts in the ground, especially for the oil and natural gas industry. It has on its outer periphery a surface of revolution providing a succession of hollow profiles with a rounded... | 09/08/1987 |
| 4665979 | Metal casing hanger seal with expansion slots A casing hanger seal for a subsea well uses a seal ring having inner and outer walls spaced radially apart from each other. An energizing ring is moved from disengaged position to an engaged position between the walls, wedging them apart to form the metal... | 05/19/1987 |
| 4619555 | Slipline adjustable manhole seal Improvements in the technique of sliplining a buried pipe, so as to minimize adverse affects of differences in expansion and contraction of the old and new pipe, while maintaining seals at the ends thereof is disclosed employing at each pipe end a sleeve-... | 10/28/1986 |
| 4499950 | Wellhead stabilization A sub-sea well assembly has features to eliminate side-to-side movement between a wellhead and a wellhead housing due to movement of the drilling vessel. The wellhead extends into the wellhead housing and is connected on its upper end to equipment extendi... | 02/19/1985 |
| 4423778 | Concentric tubing separation joint A concentric insulating tubular conduit string, including a separation joint comprising first and second couplings with concentric tubular sleeve members extending therebetween, is disclosed. An insulating conduit incorporating this integral separation jo... | 01/03/1984 |
| 4415186 | Flanging system for suspending casting and tubing columns for high pressure oil or gas wells A flanging system for suspending casing and tubing columns for very deep, high pressure oil or gas wells having superimposed spools with adjacent outer flanges for joining the spools, and hangers having axial cylindrical bores therethrough. The spools inc... | 11/15/1983 |
| 4167279 | Vertically moored platform deck casinghead A novel casing torque hanger means for supporting the upper end of a string of casing from the upper end of a riser pipe which is supported by a floating vessel such as a Vertically Moored Platform. It includes a cylindrical member having a torque resista... | 09/11/1979 |
