Control method and control device for a down-the-hole rock drill

Details Control method and control device for a down-the-hole rock drill Control method and control device for a down-the-hole rock drill

1985-07-05

1987-03-31

Kazenske, E. R.

Tool driving or impacting

Processes

173 4, 173 20, 364510, 175296, E21B 414

Patent

active

046535934

ABSTRACT:
When drilling deep boreholes with a down-the-hole drill (15), the pressure and the flow of the motive fluid are controlled so that the impact velocity of the piston hammer of the drill is kept within narrow limits independently of the counter pressure in the borehole. For this purpose the quotient of pressure and flow can be held substantially constant.

REFERENCES:
patent: 3182733 (1965-05-01), Wigren
patent: 3979944 (1976-09-01), Salmi et al.
patent: 3995700 (1976-12-01), Mayer et al.
patent: 4006783 (1977-02-01), Granholm
patent: 4502842 (1985-03-01), Currier et al.

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