Rotary and mud-powered percussive drill bit assembly and method
Rotary earth boring tool
Rotary fluid converter
Rotary seal for directional drilling tools
Rotating shaft seal and bearing lubricating apparatus
Rotor of a screw hydraulic downhole motor, method for its produc
Seal for well drilling assembly
Sealed bearing assembly used in earth drilling
Sealing system for a sealed bearing assembly
Sectional drive and coupling system
Self aligning impact rock drilling tool
Self-blocking safety device
Self-driving and self-locking device for traversing channels and
Self-propelled deep well turbine drill
Self-propelled drilling head
Self-propelled percussive machine for boring holes
Shaft boring machine and method
Sinkerdrill
Skirted hammer sub for dual tube drilling
Soil drilling equipment