Oilfield Glossary
Oilfield Glossary
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Tools

Well Workover and Intervention

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well workover and intervention  Once a well has been completed and has produced for some time, it must be monitored, maintained and, in many cases, mechanically altered in response to changing conditions. Well workovers, or interventions, are performed by inserting tools in wellbores to conduct maintenance or remedial actions. This discipline covers various technologies that range in complexity from running basic slickline-conveyed rate or pressure control equipment to replacing completion equipment. Important terms include acidizing, fishing, pulling tool, squeeze, stripping and well servicing. All definitions within this discipline have been written and reviewed by intervention and workover experts, and many are supplemented by high-quality illustrations. 

A

abrasive jetting acetic acid acid job acidize
absolute filter acid acid stimulation acidizing
accelerator acid frac acid tank antifoam
accumulator acid inhibitor acid wash antifoam agent

B

back up basket blind box broach
balance point batch mixer blind shear ram buffalo head
ball diverter bed wrap blind-shear ram buffer
ball dropper belt effect braided line bull plug
ball launcher bias weld breaker burn over
ball out blast sleeve bridge off burn shoe
ball sealers bleed off bridge-off burn-over
ballout bleedoff line bridging agent butt weld
barrel pump blender bridging material

C

C pump chemical diverter coiled tubing consistometer
casing patch chrome tubing coiled tubing connector contaminant
casing roller circulation sub coiled tubing string core testing
casing scraper circulation valve coiled tubing unit corrosion inhibitor
centrifugal pump clay stabilizer collapse pressure counterbalance winch
chelate clean out collector coupon
chelating agent cleanout combi BOP crosslinker
chelation closing unit command trailer CT
chemical diversion closure pressure composite frac tree

D

dart deployment system diverter dummy valve
defoamer depth correlation diverting agent dump bailer
densitometer diversion dosing pump duplex pump

E

electrical coupon entrained gas equalizing valve external cutter
endless tubing equalizing loop excess cement

F

field weld flowmeter frac balls frac tree
fishing fluid compatibility test frac crew frac valve
fishing diagram fluid level frac gel fracturing mandrel
fishing neck fluid loss frac gradient fracturing manifold
flag fluid-friction reducer frac head fracturing pressure
flow assurance foam breaker frac iron fracturing sleeve
flow back foam diversion frac job free point
flow cross foam generator frac manifold free point indicator
flow meter formation fracture pressure frac pump free-point indicator
flowback formic acid frac stack friction reducer

G

gas buster goat head grapple grease-injection system
gauge tank goose neck grease injection system gripper blocks
gin pole gooseneck

H

hammer union high-pressure squeeze hydraulic disconnect hydrochloric acid
heavy pipe hot oiler hydraulic fracturing hydrofluoric hydrochloric acid
hesitation squeeze HPU hydraulic power pack hydrofluoric-hydrochloric acid
HF hydraulic bypass hydraulic power unit hydrogen sulfide
high pressure squeeze hydraulic centralizer hydraulic release tool hydrostatic bailer
high-pressure manifold

I

inhibited acid injector head internal flash iron stabilizer
injection test intensifier

J

jacking frame jet cutter junk pusher junk sub
jar

K

kill pump

L

levelwind liner patch load oil lubricator
lifting frame live cement lock-up lubricator valve
light pipe load cell

M

manifold maximum treating pressure mill minifrac
marker joint mechanical diversion mill out missile
mast unit mechanical jar mill shoe mud acid
matrix acidizing memory gauge milling mutual solvent
matrix stimulation

N

neutralizing solution nitrified fluid nitrogen lifting nominal filter

O

ovality limit overflush overshot

P

packoff pickling fluid polymer plug pulling tool
paddle blender pill poppet valve pump cavitation
paddle mixer pilot mill positive displacement pump pump manifold
paraffin scraper pipe heavy pressure sender pumper
paraffin scratcher pipe light proppant pumping schedule
pickle

R

ram preventer reel back tension remedial cementing rod unit
reciprocating pump reel back-tension residual bend roller stem
recirculating mixer reeled tubing rod elevators running squeeze
reel release joint rod string running tool

S

safety clamp setting tool snubbing force stationary slips
safety head shear ram snubbing jack stationary snubbers
safety joint shear seal BOP spooler stem
sand bailer shear stock spot stimulation
sand cleanout shear-seal BOP spotting stimulation byproduct
sand lifting shifting tool squeeze stimulation fluid
sand line sinker bar squeeze cementing stripper rubber
sand out slickline squeeze job stripping
sandout slug squeeze manifold stripping ram
scraper slugging pill squeeze packer sulfide stress cracking
screen out snub squeeze pressure swab valve
screenout snubbers squeeze tool swaging tool
secondary cementing snubbing stabbing valve swivel flange
sequestering agent snubbing basket

T

taper tap travelling slips tree saver tubing testing tool
tapered string travelling snubbers triplex pump tubing-end locator
thickening time treating iron tubing job tubular jar
through-tubing treatment fluid

U

unloading valve

W

wash over water control wireline work string
wash pipe weight indicator wireline cutter workover
washover well servicing wireline grab workover fluid
washover shoe well stimulation work basket workover string
water block wire clamp

Z

zipper manifold