downhole drill

downhole drill

[′dau̇n‚hōl ′dril]
(mining engineering)
A hammer or percussive drill in which a reciprocating pneumatic piston is located immediately behind the drill bit and can follow and enter the bit down the hole, for minimizing energy losses.
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References in periodicals archive ?
CAD Systems has unveiled a downhole drill bit that was designed in SOLIDWORKS, programmed (G-code) with Mastercam, machined on a 5-axis Haas CNC Machine Tool, and also direct metal printed on a 3D Systems DMP 3D printer.
Halliburton has released the RezConnect Well Testing System, a complete well testing solution for wireless control of downhole drill stem test tools (DST), measurement and analysis of well-test data in real time.
A second key technology, which matured in the 1970s, is the downhole drill motor.