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      • de-oiling
      • deaerator
      • deasphalting
      • degas
      • degradation
      • dehydrator
      • delamination wear
      • demerit rating
      • demulsibility
      • demulsifier
      • denaturing oil
      • density
      • DEO
      • Department of Transportation (DOT)
      • deplete
      • depletion allowance
      • deposits
      • depth filter
      • depth filter media
      • dermatitis
      • desoprtion
      • detergent
      • detergent oil
      • detergency
      • detergent-dispersant
      • detonation
      • dewaxing
      • dibasic acid ester (diester)
      • dielectric
      • dielectric loss
      • dielectric strength (breakdown voltage)
      • diesel engine
      • diesel fuel
      • diesel index
      • dieseling
      • diester
      • differential pressure indicator
      • differential pressure valve
      • Dilchil®
      • diluent
      • dilution of engine oil
      • dimer
      • DIN
      • directional control servo valve
      • DKA
      • dN factor
      • diolefin
      • direct additive
      • directional control valve
      • dirt capacity
      • dispersant
      • dispersion
      • disposable
      • dissipation factor
      • dissolved air
      • dissolved gases
      • dissolved water
      • distillate
      • distillate fuel
      • distillation (fractionation)
      • distillation method
      • distillation test
      • distillation tower
      • dolomite
      • double seal
      • drag
      • drag-reducing additive (DRA)
      • drain interval
      • drawing
      • drawing compound
      • drilling
      • drilling fluid
      • drilling mud
      • drilling oil
      • drop-feed oiler
      • dropping point
      • drum
      • dry lubrication
      • dry point
      • dry running
      • dry sump
      • dual line system
      • dumbbell blend
      • duplex filter
      • dynamic demulsibility
      • dynamic load
      • dynamic seal
      • dynamometer
      • dyne
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drilling oil

drilling oil - fluid component of mud for rotary drilling of oil wells. Diesel fuel is most commonly used in this application; however, there is a trend toward the use of high quality mineral oils with lower viscosity for faster drilling rates, higher flash point for improved safety, and low aromatics content for reduced potential toxicity to workers and the environment.

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