STATE SELF-ADAPTIVE TURBINE TYPE PULSE GENERATOR AND DOWNHOLE DRILLING TOOL

Bottom-hole impact-rotation stepping combined unloading rock-breaking efficient drilling system and method thereof

Non-destructive testing device customization

Digitally controlled agitation switch smart vibration assembly for lateral well access

Rotationally selectable lock of shaft to housing

Percussion device

Jet hammer

Combined directional and impact drilling motor

Method and device for directional down-hole drilling

Using a rotating inner member to drive a tool in a hollow outer member