Oil and Gas Terms Beginning with "D"
117 terms
DD
Definition coming soon.
DEA unit
Definition coming soon.
DMO
Definition coming soon.
DSS
Definition coming soon.
DST
Definition coming soon.
DST pressure chart
Definition coming soon.
Dean-Stark extraction
Definition coming soon.
Dix formula
Definition coming soon.
dB
Definition coming soon.
datum level
Definition coming soon.
day rate
Definition coming soon.
daylight tour
The work shift on a drilling rig that covers daylight hours, typically from 6:00 AM to 6:00 PM; the crew working this shift is called the daylight tour crew, as distinguished from the evening or morning tour crews.
dead oil
Definition coming soon.
decibel
Definition coming soon.
decollement
Definition coming soon.
deconvolution
Definition coming soon.
deep induction
Definition coming soon.
deep penetrating charge
A perforating charge designed to create a long, narrow perforation tunnel extending deep into the formation, maximizing connection to the reservoir and bypassing near-wellbore damage to improve production or injection rates.
deep seismic sounding
Definition coming soon.
deep tow
Definition coming soon.
deep-penetrating charge
Definition coming soon.
deep-water play
Definition coming soon.
deepwater play
A prospective area for oil and gas exploration in water depths greater than 1,500 feet (457 meters), characterized by specific geological conditions, reservoir presence, trapping mechanisms, and hydrocarbon source potential that collectively justify drilling exploration wells.
deflector flowmeter
Definition coming soon.
differential weathering correction
Definition coming soon.
differential-temperature log
Definition coming soon.
difficult to disperse
Definition coming soon.
difficult to disperse in salt
Definition coming soon.
diffraction
Definition coming soon.
diffraction stack
A seismic processing technique that sums or collapses diffraction hyperbolas in seismic data caused by point scatterers such as faults, pinchouts, or small features, migrating the energy back to its true subsurface location to improve image clarity.
diffusion
Definition coming soon.
diffusion equation
Definition coming soon.
diffusion relaxation
Definition coming soon.
dike
Definition coming soon.
dilatancy
Definition coming soon.
dilatancy theory
Definition coming soon.
dilatation
Definition coming soon.
dilatational wave
A compressional or longitudinal wave in which particle motion is in the direction of wave propagation; also called a P-wave, it is the primary wave type used in seismic exploration and travels through solids, liquids, and gases.
diluent
Definition coming soon.
dilution
Definition coming soon.
dilution water
Fresh water added to a drilling fluid to reduce its density, viscosity, or solids concentration; dilution water is used to maintain mud properties within specified ranges and is a primary method of controlling total solids content.
dim spot
Definition coming soon.
dip
Definition coming soon.
dip correction
Definition coming soon.
dip fault
Definition coming soon.
dip moveout
Definition coming soon.
dipole
Definition coming soon.
dipping bed
Definition coming soon.
direct emulsifier
A surfactant or emulsifier that promotes the formation of oil-in-water (direct) emulsions by reducing interfacial tension between oil and water phases, with the hydrophilic portion oriented toward the water phase.
direct hydrocarbon typing
Definition coming soon.
direct indicating viscometer
Definition coming soon.
direct-indicating viscometer
Definition coming soon.
directional driller
Definition coming soon.
directional drilling
Definition coming soon.
directional permeability
Definition coming soon.
directional survey
A measurement of the wellbore path in three-dimensional space, recording inclination angle and azimuth at regular depth intervals to determine the actual trajectory of a directional or horizontal well relative to the surface location.
directional variograms
Definition coming soon.
directional well
Definition coming soon.
directivity
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dirty
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disbonding
Definition coming soon.
disconformity
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discontinuity
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disharmonic
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dispersant
Definition coming soon.
dispersed bubble flow
Definition coming soon.
dispersed clay
Definition coming soon.
dispersion
Definition coming soon.
displacement
Definition coming soon.
displacement efficiency
Definition coming soon.
displacement fluid
Definition coming soon.
displacement front
Definition coming soon.
disposal well
Definition coming soon.
dissolved solids
Definition coming soon.
distillation extraction
Definition coming soon.
distortion
Definition coming soon.
distributed temperature log
A continuous temperature measurement along the wellbore using fiber optic technology or multiple sensors to monitor temperature profiles over time; used to detect fluid influx, injection conformance, steam front location, and fluid entries in production wells.
distributed-temperature log
Definition coming soon.
distribution
Definition coming soon.
diurnal variation
Definition coming soon.
divergence
Definition coming soon.
diversion
Definition coming soon.
diverter
A device or system used to redirect fluid flow in a wellbore or at surface; downhole diverters are used in completions to redirect fracturing fluid or acid to specific zones, while surface diverters on shallow wells provide emergency flow redirection away from the rig.
diverter flowmeter
Definition coming soon.
diverting agent
A material pumped into a wellbore or formation to temporarily block high-permeability zones and redirect fluid flow to lower-permeability intervals; diverting agents include benzoic acid flakes, rock salt, wax beads, and degradable materials used in acid and fracturing treatments.
division order
Definition coming soon.
dog collar
Definition coming soon.
dog house
Definition coming soon.
dog leg
Definition coming soon.
doghouse
Definition coming soon.
dogleg
Definition coming soon.
dolomite
Definition coming soon.
dolomitization
Definition coming soon.
dolostone
Definition coming soon.
domain
Definition coming soon.
domainal fabric
Definition coming soon.
domainal structure
Definition coming soon.
dome
Definition coming soon.
doodlebugger
Definition coming soon.
drop bar
Definition coming soon.
drop sub
Definition coming soon.
drop-off gun
Definition coming soon.
dropoff gun
A perforating gun designed to be pumped down the tubing on a wireline and drop into the tubing below to allow retrieval or run in combination tools, commonly used in horizontal wells or wells where wireline access is restricted.
dropout
Definition coming soon.
dry bed
Definition coming soon.
dry bed dehydrator
A natural gas dehydration system that removes water vapor from gas streams using a solid desiccant material such as molecular sieves or silica gel in a fixed bed, producing very dry gas suitable for pipeline transport or cryogenic processing.
dry combustion
Definition coming soon.
dry forward combustion
Definition coming soon.
dry gas
Definition coming soon.
dry hole
Definition coming soon.
dry oil
Definition coming soon.
dry rock
Definition coming soon.
dry-bed dehydrator
Definition coming soon.
dual completion
Definition coming soon.
dual induction
Definition coming soon.
dual permeability reservoir
A reservoir with two distinct permeability systems—typically a matrix and a fracture network—in which fluid can flow through both systems simultaneously, requiring specialized flow equations and simulation models to accurately predict performance.
dual porosity reservoir
A reservoir containing two distinct porosity systems, typically a low-permeability matrix that stores most of the hydrocarbons and a high-permeability fracture network that provides the primary flow paths to the wellbore, common in naturally fractured carbonates.