Drilling string shock-absorbing tool
Drilling string shock-absorbing tool
Expandable milling head for gas well drilling
Fluid controlled adjustable down-hole tool
High-load hydraulic disconnect
High-load hydraulic disconnect
Hydraulic shock absorber
Hydraulic shock absorber
Hydraulic shock absorber with nitrogen stabilizer
Joint device in extension drill equipment for percussive drillin
Locking swivel apparatus with a supplemental internal...
Mechanical drilling jar
Mechanical locking swivel apparatus
Method, drilling tool and rock drill bit for transferring impact
Pressure compensated weight on bit shock sub for a wellbore dril
Reciprocating drill bit
Releasing tool
Roller Belleville spring damper
Roof drill and drill rod system
Shear sub for drill string