| 摘要 |
The system for compensating the weight of a tubular element to be connected to a drill string comprises a gripping arm assembly (2, 3) arranged with a gripping device to hold the tubular element (6) in a position for connection to the drill string, and a load supporting and compensating arrangement provided for supporting at least a portion of the load of the tubular element. The load supporting and compensating arrangement comprises a cylinder unit (7), a winch (12), a sheave (11) and a wire (10) connected to a piston (13) of the cylinder unit. The wire runs around the sheave (11) and has the other end connected to the winch (12), wherein the sheave is connected to the gripping arm assembly and the winch and the cylinder unit are arranged in elevated positions compared to the position of the sheave, and the cylinder unit maintains a minimum tension in the wire. |
