Variable orifice gas lift valve for high flow rates with...

Variable orifice sleeve valve hydraulic jar tool

Variable position gas trap

Variable rpm submersible pump assembly

Variable sizable wound spring wire screen

Variable size coil tubing gripping elements

Variable sized slotted pipe insert for screening of...

Variable speed auger for use with a skid steer vehicle

Variable speed well head drive

Variable speed wellhead top drive

Variable stiffness lower joint for pipe riser with fixed bottom

Variable weir assembly for drilling rig sump systems and...

Variably sizable wound wire screen

Varied pitch rotary rock bit

Varying properties along lengths of temperature limited heaters

Varying properties of in situ heat treatment of a tar sands...

Varying temperature oil recovery method

Vehicle for transporting heavy loads

Vehicle-mounted earth drill with detachable tower

Vehicles for rock drill guiding and supporting structures