(di)electric strength - adjustable rocker counterbalancing
- (di)electric strength
- (di)electric strength
- (direction of) strike
- (dis) fluid
- (downhole) turbine motor drilling
- (drag-) chisel drilling bit
- (drill) cuttings analysis
- (drill) pipe straightener
- (drilling mud) centrifugal pump mixer
- (drilling mud) circulation rate
- (drilling) bit centering
- (drilling) mud make-up water
- (drilling) reamer
- (E/ P.R.) Diff/ Press Switch
- (effluent) disposal line
- (fire) engine
- (foot) step bearing
- (formation) density logging
- (formation) fluid processing equipment
- (free) span
- (friction) lining
- (gas) reservoir pressure
- (geological) prospecting
- (geophysical) well logging
- (he came with a) follow-up on the issue
- (highly) folded rock
- (horizontal) displacement
- (hydraulic) fracturing unit
- (hydro) unit
- (in) gas
- (in) nomograph of (bore)
- (in) parallel
- (industry) branch economics
- (industry) sector economics
- (jet) piercing of wells
- (jet-pump) pellet impact drill
- (kelly) rathole
- (mechanical) drilling
- (metamorphic) aureole
- (milling) cutter
