Stretch compensation in a hoisting system for a derrick

Details Stretch compensation in a hoisting system for a derrick Stretch compensation in a hoisting system for a derrick

E - Fixed Constructions

21

B

E21B 19/02 (2006.01) B66B 7/10 (2006.01) E21B 19/084 (2006.01) E21B 19/086 (2006.01) E21B 19/16 (2006.01)

Patent

CA 2240797

An apparatus for a derrick, comprising two or more hydraulic piston-cylinder arrangements (10, 11) for raising and lowering a yoke (8) which travels on guide rails (7) in the derrick (1) itself, where two or more wire lines (13) are strung over sheaves (12) rotatably attached to the yoke. The wire lines (13) are attached at one end thereof to the top drive (9) and at the other end thereof are secured to an attachment point (14a, 14b) adjacent to a drill floor (2), said two or more wire lines being run in two sets (13a, 13b) of lines. The attachment points (14a, 14b) for each wire set are connected to a tension equalizer assembly to equalize differences in tension in the wire lines.

L'invention porte sur un appareil destiné à un derrick, comportant deux mécanismes hydrauliques à piston-cylindre (10, 11), destinés à faire monter et descendre un joug (8) se déplaçant sur des rails de guidage (7) situés sur le derrick (1) lui-même, deux filins (13) ou davantage étant tendus sur des poulies (12) montées rotatives sur le joug. Les filins (13) sont attachés par l'une de leurs extrémités à un mécanisme supérieur d'entraînement (9) et assujettis par l'autre extrémité à un point de fixation (14a, 14b) contigu au plancher (2) d'un outil de forage, lesdits filins, deux à tout le moins, étant agencés en deux ensembles (13a, 13b). Les points de fixation (14a, 14b) de chaque ensemble de filins sont rattachés à un ensemble d'égalisation des tensions destiné à équilibrer des différences de tension existant entre les filins.

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