Targetable drill with pressure telemetering of drill parameters

Details Targetable drill with pressure telemetering of drill parameters Targetable drill with pressure telemetering of drill parameters

E - Fixed Constructions

21

B

255/6

E21B 10/00 (2006.01) E21B 7/06 (2006.01) E21B 44/00 (2006.01) E21B 47/022 (2006.01) E21B 47/18 (2006.01)

Patent

CA 1222505

ABSTRACT OF THE DISCLOSURE A dirigible drilling head is provided with a hydraulic pulser in its rotating inner tube in the form of a spindle piston which can obstruct the flushing medium passage and is displaced by a hydraulic circuit including a hydraulic valve. The hydraulic valve is in turn actuated by a miniature electronic circuit so that a variety of input parameters from respective sensors can be delivered to the circuit and transformed into respective hydraulic pulses which are monitored by a differential pressure pickup connected to the line feeding the flushing liquid to the string.

459298

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