| 摘要 |
A top drive system for drilling with casing, comprises a top drive 10 and a top drive adapter 20 for gripping the casing. The top drive adapter is operatively connected to the top drive. In one aspect, an access tool 210 is operatively connected to the top drive and adapted for accessing a fluid passage of the top drive system. The access tool may be configured for top entry (fig. 1) or disposed below the top drive. The access tool may be used for insertion of a conveying member such as a wireline 15. In a second aspect, a launching tool (360, fig. 8) and actuating device (367, fig. 8) are coupled to the top drive. The actuating device may release a ball or plug. In a third aspect, a cementing tool (515, fig. 9) is coupled to the top drive. |
