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
Drill Stem Test (DST)
Conventional method of testing a formation to determine its potential productivity before installing production casing in a well. A testing tool is attached to the bottom of the drill pipe and placed opposite the formation to be tested which has been isolated by placing packers above and below the formation. Fluids in the formation are allowed to flow up through the drill pipe by establishing an open connection between the formation and the surface.
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