| 摘要 |
Apparatus and methods are disclosed for accessing a drill pipe bore through a drill pipe top drive unit. The top drive is carried by a traveling block so it may be used for simultaneous application of rotational and longitudinal force on the drill string. A pack-off body has a shortened effective length due to mounting a flange thereabouts for securing to the top drive unit once a gooseneck circulation flow line has been removed in accordance with the method of the invention. A sheave support arm is mounted in cantilever fashion to the pack-off body and carries thereon two sheave wheels provided at desired locations to direct a wireline cable radially outwardly without frictionally engaging either the traveling block and hook or the top drive unit. The angles of bending of the wireline by placement within the support arm are chosen to prevent damage to the wireline containing an electrical connector. |
