Flow control tool

Flow control valve and method of controlling rotation in a...

Flow pulsing apparatus for use in drill string

Flow restricter for mud lubricated earth drilling motors

Flow restrictor valve for a downhole drilling assembly

Fluid actuated downhole drilling device

Hermetically sealed progressive cavity drive train for use in do

High pressure downhole progressive cavity drilling apparatus wit

Hydraulic braking device for turbine, turbine equipped with...

Improved mud motor system incorporating fluid bearings

In-hole motor drill with locking bit clutch

Inverted motor for drilling rocks, soils and man-made...

Jet nozzle drilling assembly

Lockable motor assembly for use in a well bore

Long gauge roller vane drilling motor

Machine operating according to the Moineau-Principle for the...

Mechanically actuated fluid control device for downhole fluid mo

Oscillating friction ring assembly for applying axial thrust to

Peristaltic down-hole drilling motor

Pressure balanced bearing assembly for downhole motors