Top drive apparatus

Details Top drive apparatus Top drive apparatus

E - Fixed Constructions

21

B

E21B 33/072 (2006.01) E21B 3/02 (2006.01)

Patent

CA 2135404

2135404 9323654 PCTABS00028 Top drive apparatus is described for permitting entry of a wireline into a borehole. The apparatus includes a main housing (10) which has a through bore (13) for receiving a wireline in use. The apparatus (10) also includes a pack-off (2), a flow tube assembly (3) and grease seal control head (20), a ball check valve assembly (4) and a tool catcher assembly (5). Coupling means (1) is mounted on the housing (10) to permit fluid to be fed from an external fluid source into the body of the housing (10). The coupling means (1) comprises a rotational coupling means to permit fluid to be fed into the body of the housing (10) during rotation of the housing (10) relative to the external fluid source.

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