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| Number | Title | Issue Date |
| 6056060 | Compensator system for wellbore tubulars A new joint compensator and systems with it and methods of their use have been invented which, in one aspect, includes a compensator system for compensating for the weight of at least one joint, which is a wellbore tubular member, the compensating system ... | 05/02/2000 |
| 6000472 | Wellbore tubular compensator system New joint compensator and systems and methods of their use have been invented which, in one aspect are useful for compensating for the weight of a first joint and at least one subsequent joint, the first joint to be supported above the at least one subseq... | 12/14/1999 |
| 5850877 | Joint compensator New joint compensator and systems and methods of their use have been invented which, in one aspect are useful for compensating for the weight of a first joint and at least one subsequent joint, the first joint to be supported above the at least one subseq... | 12/22/1998 |
| 5609457 | Pipe alignment apparatus for use on wellhead derrick An alignment apparatus for use on a well derrick or drilling rig for engagement with a pipe section either being connected to or disengaged from the upper end of pipe string within a well bore hole. The apparatus includes a supporting frame for connection... | 03/11/1997 |
| 5437527 | Arrangement in a pipe handling system The invention relates to an arrangement in a pipe handling system, especially for handling pipes (4P) in connection with a derrick 1A, wherein the arrangement comprises a tower (1) and two preferably individually controlled operating arms (2a, 2b). The pi... | 08/01/1995 |
| 5127790 | Pipe and casing handling method A method of using an apparatus for handling heavy pipe is set forth. Pipe is rolled off the end of a pipe rack into a waiting elongate trough. The trough is moved on a pair of trolley cables extending from that area up towards a rig floor, the trolley cab... | 07/07/1992 |
| 5062756 | Device for positioning and stabbing casing from a remote selectively variable location A casing stabbing apparatus which includes a derrick bracket subassembly for attachment to a derrick, and a boom having an end pivotally connected to the bracket assembly for pivotation about a vertical axis and about a horizontal axis. A pair of arcuate ... | 11/05/1991 |
| 5049020 | Device for positioning and stabbing casing from a remote selectively variable location A casing stabbing apparatus which includes a derrick bracket subassembly for attachment to a derrick, and a boom having an end pivotally connected to the bracket assembly for pivotation about a vertical axis and about a horizontal axis. A pair of arcuate ... | 09/17/1991 |
| 4921386 | Device for positioning and stabbing casing from a remote selectively variable location A casing stabbing apparatus which includes a derrick bracket subassembly for attachment to a derrick, and a boom having an end pivotally connected to the bracket assembly for pivotation about a vertical axis and about a horizontal axis. A pair of arcuate ... | 05/01/1990 |
| 4901805 | Unit for borehole running and pulling operations The unit for borehole running and pulling operations with drill pipes or rods has its centralizer mounted for vertical reciprocation along guides and horizontal displacement along guideways in the opening of the racking platform in its cooperation with th... | 02/20/1990 |
| 4793422 | Articulated elevator links for top drive drill rig An apparatus for a top drive drill rig lifts a stand of the drill pipe into engagement with the drive stem in the derrick. The apparatus includes a set of elevators mounted between the drive head by a link assembly. The link assembly includes two link sec... | 12/27/1988 |
| 4791997 | Pipe handling apparatus and method A pipe handling apparatus for a drilling rig is mounted on the rig floor. The drilling rig has a top drive with a power drive stem. Elevators are suspended below the drive stem. The lifting member has a supporting arm to receive the bottom of a stand of d... | 12/20/1988 |
| 4652195 | Casing stabbing and positioning apparatus A casing stabbing apparatus which includes a derrick bracket subassembly for attachment to a brace of a derrick, and a boom having an end pivotally connected to the bracket assembly for pivotation about a vertical axis and about a horizontal axis. A pair ... | 03/24/1987 |
| 4643624 | Guide means for stabilizing pipe strings A guide means is removably affixed to the derrick of a workover rig or the like for capturing and stabilizing a medial part of a pipe section as a pipe string is being made up and run into a wellbore. The guide apparatus is pivotally mounted to the derric... | 02/17/1987 |
| 4453884 | Hook rotating mechanism In a drilling system in which the hook is guided for vertical travel, by a pair of guide cables supported in the tower, so as to be in a given azimuth while handling drill pipe in the hole, an improvement in the hook mechanism which provides for rotating ... | 06/12/1984 |
| 4440536 | Method and device for positioning and guiding pipe in a drilling derrick A method and device for positioning and guiding pipe, including coupling and uncoupling pipe, in a drilling derrick having a work table for securing pipe extending into the well. The upper end of a first pipe section is received and horizontally secured b... | 04/03/1984 |
| 4348920 | Well pipe connecting and disconnecting apparatus A power driven tool for making and breaking threaded connections in a well pipe is movable between a central position of alignment with the well axis, a second position offset from the well axis and above a mousehole, and a third retracted or inactive pos... | 09/14/1982 |
| 4157129 | Stabbing board assembly A stabbing board assembly comprising a support platform mounted for powered vertical adjustment on a pair of laterally spaced vertical rails which are in turn fixed, preferably releasably, to structural members of a derrick by upper and lower sets of long... | 06/05/1979 |
| 4108318 | Apparatus for offshore handling and running of a BOP stack Methods and apparatus for handling a BOP stack on an offshore drilling vessel and for running the stack from the vessel to sea bottom, while maintaining substantially continuous constraint on the stack, are disclosed. Constraining and guide members are pr... | 08/22/1978 |
| 3976207 | Casing stabbing apparatus Apparatus for stabbing casing pipe as the casing is being run into a well bore. It includes a casing handling head arranged for grasping a generally upright section of casing pipe near the upper end thereof. The head is controllable for movement in a hori... | 08/24/1976 |
| 3939991 | Parking brake for subsea mining lift system A parking brake for subsea mining equipment that is raised and lowered by a pipe string from a surface vessel. The brake assembly is mounted between a pair of linear lift units that alternately grip equally spaced collars on the pipe and move the pipe str... | 02/24/1976 |
