Drill string component

Details Drill string component Drill string component

E - Fixed Constructions

21

B

E21B 17/00 (2006.01) E21B 7/20 (2006.01) E21B 21/10 (2006.01) E21B 34/12 (2006.01)

Patent

CA 2054919

Drill string component for top hammer drilling comprising a rod (13) surrounded by a tube packet (4,5). The rod is provided with a thickened section (14) for cooperation with a diameter reduction (15) in the tube packet which at upwards drilling is situated below the section (14). Through this flushing liquid is prevented from flowing out of the drill string when the drill string is extended.

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