Drilling Industry Glossary
daily drilling report
density hierarchy
derrick
derrickhand
diamond bit
differential pressure
differential survey
directional drilling
directional drilling software
displacement fluid
doghouse
dogleg
dogleg severity
donkey pump
doughnut
downhole motor
downtime
draw works
drill collars
drill collar sub
drill pipe
drill stem
drill stem test
drill string
drillers
drilling engineering design
drilling fluid
drilling foreman
dry hole
dual completion
dutchman
Dogleg Severity (DLS)
This is a measure of the rate of change of direction of the wellpath. Usually this is measured in (1) degrees per 100 feet; (2) degrees per 30 meters; (3) degrees per 30 feet; and/or (4) degrees per 10 meters. The interval usually reflects the spacing in a directional survey station.
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