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OFFSHORE TERMS AND ABBREVIATIONS
 
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D

 

 

Terms

Decompression - slow, controlled reduction of pressure inside a pressure chamber to prevent divers
from suffering the "bends" after a too fast ascent.
Degassing - the removal of oil and gas from the drilling mud which may then be used again.
Dehydration Plant - or Water Separation Plant - various types of equipment for the "drying" of gas
or oil.
Derrick Man - platform worker handling the drill stem in the tower.
Deviated Well - a hole which intentionally is not drilled straight down.
Diamond Bit - the tip of the drill stem reinforced with diamond to prolong its lifetime.
Dip Meter - an instrument to measure deviations in the vertical component in the terrestrial magnetic
field. Used to determine the position of the sediment and its structure, and to measure the deviation of
the drilling hole.
Directional Drilling - see Deviated Well.
Disposal Well - drilling hole which is prepared for the re-injection of produced saline into the
reservoirs.
Diving Bell - bellshaped construction for deepsea diving.
Diving Support Vessel - ship with diving equipment on board, carrying out various types of diving
operations. May also be equipped with remotely operated or controlled sub-sea robots (Remote
Operated Vehicle - ROV).
Donald Duck-effekt - voice distortion due to the inhalation of the oxygen-helium mixture used in
deepsea diving.
Drag Bit - one-bladed drillbit for drilling in soft sediments.
Drift - horizontal error during drilling operations.
Driller - the person in charge during drilling operations.
Drilling Fluid, Drilling Mud - a special mixture used during drilling operations to lubricate the bit and
balance the pressure in the drilling hole.
Drilling Supervisor - the engineer in charge.
Drilling Tender - service vessel with personnel and equipment to the drilling rig.
Drill Pipe - pipes with thin walls used during drilling. Each section is normally approximately 10
metres long.
Drilling Barge - barge equipped for drilling operations in smooth seas. Normally not equipped with
own propulsion machinery. Max. drilling depth approximately 150 metres.
Drilling Rig - drilling tower with turntable and mudpumping system. May be installed on an offshore
rig or placed on a fixed or floating offshore installation like a drillship.
Drillship - ship equipped with drilling rig and its own propulsion machinery. Kept in position by
Dynamic Positioning Equipment. Operating in waters with a max. depth of 2,000 metres.
Drilling Tender - ship serving drilling installations which are depending on a ship or a barge for
storage, accommodation, etc.
Drill Stem - the string driving the bit into the sediments.
Drill Stem Test - standard procedure to test oil or gas discoveries during drilling.

Drill String - see Drill Stem.

Abbreviations

DIS - Dansk Internationalt Skibsregister - Danish International Shipregister.
DG - Directorate General - the term used for the various departments of the EU-Commission.
DNME - Dynamic Non-Member Economies (referring to dynamic countries which are not members of
the OECD)
DNMF - Det norske maskinistforbund - the Norwegian association for ships' engineers.
DNV - Det Norske Veritas (NV) - Norwegian classification society.
DoTI - Department of Trade and Industry, UK
DR - Danmarks Rederiforening - the Danish Shipowners' Association.
DSO - De samarbeidende organisasjoner - cooperation between DNMF and NS for mobile offshore
installations (Norway).

DSRK - Deutsche Schiffs Revision und Klassifikation - German classification society.

   
 

 
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