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Drilling
Drilling terminology deals with major rig components, processes and equipment required to drill and case a well. Definitions in this module range from abnormal pressure to penetration rate and zip collars, and many are augmented by color photographs or high-quality illustrations. All definitions have been reviewed by technical experts in the field of drilling.

A
abnormal pressure adjustable choke air drill air drilling annular blowout preventer	annular BOP annular gas flow annular velocity annuli annulus	antiwhirl bit aquifer AV azimuth
B
back off back wash background gas backoff backwash barefoot basket sub bell nipple BGG BHA BHCT BHP BHST bicenter bit bit	bit box bit breaker bit nozzle bit record bit trip blind ram block blow out blow out preventer blowout blowout preventer BOP BOP stack borehole bottomhole assembly bottomhole circulating temperature	bottomhole pressure bottomhole static temperature bottoms up bottoms-up bow-spring centralizer box brake break circulation break out breakout breakout cathead breakout tongs bridge brine bullhead
C
cable head cable-tool drilling caliper log carbide lag test cased hole casing casing centralizer casing collar casing coupling casing grade casing head casing point casing shoe casing string casinghead cat line cathead catline catwalk	cellar cement cement bond log cement evaluation log cement head cementer cementing cementing engineer chain tongs choke line choke manifold Christmas tree circulate circulate out circulation circulation loss circulation system coiled tubing coiled tubing drilling combination string	come out of the hole company man company representative completion concentric conductor pipe connection connection gas contamination gas contract depth core crooked hole crossflow crown block crushed zone CT cut and thread fishing technique cut-and-thread fishing technique cuttings
D
day rate daylight tour degasser derrick derrick floor derrickman desander desilter deviated drilling deviated hole deviation survey diamond bit differential pressure differential pressure sticking differential sticking directional driller directional drilling	directional survey directional well displacement displacement fluid dog house dog leg doghouse dogleg dope drag bit drawworks drift drill bit drill collar drill pipe drill ship drill string driller	drilling break drilling contractor drilling crew drilling foreman drilling procedure drilling program drilling rate drilling rig drilling riser drillpipe drillship drillstem drillstem test drillstring dry hole duster dynamic positioning
E
eccentric eccentricity electrodynamic brake elevator	embrittlement endless tubing erode erosion	escape line evening tour exit velocity
F
fingerboard fish fishing tool fixed-cutter bit	flapper valve float joint flow line flowline	formation damage formation evaluation while drilling formation pressure free water
G
gamma ray log gas cut mud gas show gas-cut mud	gauge hole geosteer geosteering Geronimo line goose neck	gooseneck graveyard tour guide shoe gumbo
H
H2S heavyweight drillpipe HHP high-pressure, high-temperature hook	hook load hopper horizontal drilling hostile environment HPHT HWDP	hydraulic horsepower hydrogen embrittlement hydrogen sulfide hydrostatic head hydrostatic pressure
I
ID inclination	inside blowout preventer inside diameter	intermediate casing string
J
jack up jackup rig jar	jet jet mixer jet nozzle jet velocity	joint junk junk basket
K
KB kelly kelly bushing	kelly down kelly hose kelly spinner keyseat	kick kill kill line
L
lag gas LCM leak off leakoff	leakoff test liner log logging while drilling lost circulation	lost circulation material LOT lubricator LWD
M
make a connection make hole make up makeup cathead makeup tongs marine drilling riser mast MD measured depth	measurements while drilling measurements-while-drilling mechanical sticking mill mist drilling mobile offshore drilling unit MODU monkey board monkeyboard moon pool	morning tour motorman mousehole mousehole connection mud motor mud pulse telemetry mud return line multilateral MWD
N
neat cement	nipple nipple down	nipple up
O
OD offset well	open hole openhole operator	outside diameter overbalance
P
p rate P&A p-rate pack off packer packoff pad PDC bit	penetration rate pill pin pipe dope pipe rack pipe ram pipe trip PIT plug and abandon	polycrystalline diamond compact bit pore pressure gradient pore-pressure gradient pressure hunt pressure integrity test prime mover pull out of the hole pusher
R
racking back pipe ram blowout preventer rate of penetration rathole ream reciprocate reserve pit reverse circulation	rig rig down rig floor rig up RIH roller cone bit roller-cone bit rotary bushing	rotary drilling rotary hose rotary steerable system rotary table roughneck round trip roustabout run in hole
S
safety joint saver sub scratcher semisubmersible settling pit settling tank shaker shale shaker shear ram sheave shoe shoe joint shoe track short trip show shut in bottomhole pressure shut-in bottomhole pressure shut-in pressure SIBHP SIBP	sidetrack SIP skid slant hole rig slant rig slant-hole rig slide slim hole well slimhole well slip and cut slip joint slip-and-cut slips snub snubbing soft line softline spacer fluid spinning chain spud	stab stand stand pipe standpipe steerable motor stripping stuck stuck pipe sub submersible drilling rig suction pit supply vessel surface casing surface pipe survey swab swabbing swellable packer swivel
T
tapered string TD Texas deck TFNB TG thief zone thread protector threadform tight hole	tongs tool joint toolpusher top drive topdrive total depth tour traveling block trip	trip gas trip out tripping pipe true vertical depth tubulars turnkey TVD twist off twist-off
U
underbalance	underbalanced underground blowout	underream
V
vee door	vee-door	volumetric efficiency
W
wait on cement wall sticking wash out washout washover pipe	weevil weight indicator well control wellbore wellhead wildcat	wiper trip wireline log WOC workover worm
Y
yield
Z
zip collars	zip grooves

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