WBlowout preventer
WBorehole
WBorehole mining
WBoring (earth)
WAnnular cutter
WCameron ram-type blowout preventer
WCasing (borehole)
WCasing cutter
WCompletion (oil and gas wells)
WConductor pipe
WCore drill
WCrown block
WDesander
WDifferential sticking
WDirectional drilling
WDirectional well
WDown-the-hole drill
WDrill line
WDrill stem test
WDrilling fluid
WDrilling riser
WDrilling stabilizer
WGA Drilling
WGerman Continental Deep Drilling Programme
WHole opener
WIce drilling
WKola Superdeep Borehole
WDrilling riser
WMousehole (drilling)
WMud systems
WOffshore drilling
WOffshore oil spill prevention and response
WOil platform
WOil well
WPlasma deep drilling technology
WResearch Centre for Deep Drilling
WRoller reamer
WRotary table (drilling rig)
WSeismic interferometry
WSemi-submersible platform
WDrillship
WSidoarjo mud flow
WSodium silicate
WSolids control
WStand (drill pipe)
WSwivel (drill rig)
WTensioner
WTraveling block
WTripping (pipe)
WUnderreamer
WSodium silicate
WWell drilling