135136 ⎘
Drives for drilling, used in the borehole; Down-hole impacting means, e.g. hammers Electrically operated hammers
DRILLING ROBOT
#2Frequency modulation for magnetic pressure pulse tool
#3Downhole jarring tool with electrical pass through
#4Magnetic pulse actuation arrangement for downhole tools and method
#5Frequency modulation for magnetic pressure pulse tool
#6Downhole stroking tool
#7Downhole vibration for improved subterranean drilling
#8Downhole vibration for improved subterranean drilling
#9Force Stacking Assembly for Use with a Subterranean Excavating System
#10Resonance enhanced rotary drilling