Wagon e.g. crawler drill wagon
Walking substructure device
Wall contacting tool
Warning device to prevent clutch burning on a well service rig
Wash tool
Washing a cylindrical cavity
Washout method and apparatus
Washpipe apparatus
Washpipe stabilisation
Waste component removal from crude oil or gas
Waste gases dispersant installation
Waste mud agitation system
Waste solid cleaning apparatus
Wastewater disposal with in situ steam production
Water absorbing polymers for treatment of brines and...
Water and drill casing units
Water based compositions for sealing subterranean zones and...
Water based foaming composition - method for making same
Water control
Water control device using electromagnetics