- deposit
- deposited drift
- depressed shoreline
- depression constant
- depressor
- depropanizer
- derived fossil
- derrick cellar
- derrick kingpost
- derrick post
- desalt
- desalting process
- descaler
- description
- desiccant bed
- desiccated
- desilicanize
- desilverization
- deslag
- desorption heat
- destinker
- destructional valley
- destructive distillation
- desulfurization unit
- detain
- detarring
- detergent
- detonator
- detoxication
- deuteromorphic
- develop
- development work
- dewatering tank
- dewaxing
- deweeding oil
- dextrin
- diabasic texture
- diagenesis
- diagonal joint
- dial
- demolding
- demoulding
- denatured alcohol
- dendrite
- dendritic
- dendritic pattern
- denitration
- dense
- densilog
- dental amalgam
- dental composite
- denudation
- denuded
- deodorant
- deodorized
- deoiler
- deoxidized
- deoxidizing slag
- deparaffin
- department
- dependable
- depentanizer
- dephlegmation
- dephlegmator
- dephosphorization
- dephosphorize
- depilatory
- depleted
- depleted well
- depletion
- depolarize
- depolarizing mix
- depolymerization
- deposited
- deposited bath
- deposited layer
- deposition plane
- deposition trap
- depository bank
- depropanation
- depth micrometer
- depurination
- derosination
- derrick crane
- derris
- desaminase
- desiccation crack
- desiccations joint
- desoxy
- destinezete
- detector-bar
- deuteric effect
- deuterogene
- deuteron
- diamide
- diasphaltenes
- diatom
- diatomaceous mud
- diazobenzene
- dichloroacetic