Device used to store potential energy and convert it to kinetic energy when the power jar fires. An accelerator is what generates the impact force by accelerating the toolstring stem.
B
Bridge Plug
A permanent or retrievable downhole tool set typically on wireline to isolate a section of the well.
C
Compact toolstring
Short toolstring that can contain all the standard toolstring items such as rope socket , accelerator, stem,power jar, spang jar etc. Mainly suitable for wells with 4 1/2" or larger tubulars
Completions
String of tubulars and other compoents through which the hydrocarbons are produced to surface.
Crossover
Means of connecting tools with differing connections together to form a complete string.
D
Data Acquisition
Gathering of data generally from deep within the wellbore.
Debris Removal
Removal of unwanted debris/deposits from the wellbore.
Deviated Wells
Wells who's trajectory or angle is not truelly vertical. Generally deviation is not highly significant for wireline intervention until it excedes 50 degree from the vertical.
Downward Jarring
The use of wireline toolstring to impart a downward shock load on tool or object within the wellbore. Downward becomrs less effective as the well deviation increases.
E
e-line
Cable with electric conduit used to lower equipment into well bore.
F
Fish Neck
Distinct profile on the uppermost section of a tool used for running or recovery of equipment within well bore
Fishing Tools
Equipment used in the recovery of stuck tools or objects from the well bore.
Flow Control
Equipment used in the management of hydrocarbon flow within the completion string.
G
Gun orientation
The rotational position of perforating gun charges
H
HPHT
High pressure / High Temperature wells. Generally used for wells with temperatures exceding 350F and wellhead pressures of 10k psi or greater
I
Isolation Plug
Device used to isolate a section of the completion string or well bore.
J
Jarring
Applying a shock load impact through manipulation of toolstring components.
K
Knuckle Joint
A tool that can be included within a toolstring to provide some articulation to allow tools to travel freely pasted kinks or bends within the wellbore
L
Leak Detection
Detecting a leak path from within the completion producing bore to annulus
M
Mechanically-set
A tool set by purely mechanical manipulation of toolstring.
Monobore
A completion string with minimal restrictions. Generally the only restriction being through the sub-surface safety valve.
N
NPT
National Pipe Thread
O
P
Permanent Plugs
Plugs that are not designed to be recovered from the wellbore. These can as a rule be milled out if required.
Plug
Device to form a pressure retaining barrier within wellbore.
Plug System
Series of tools to provide a downhole barrier.
POOH
Pull Out of Hole - anagram used to shorten offshore reporting.
Q
R
Redress kit
Parts used to re-dress a tool after use.
Roller Systems
Tools that utilise rollers to enhance intervention in deviated wells.
Rope Socket
Uppermost tool of the toolstring. Used to make the wire / cable connection to the toolstring.
S
SIM
Sealing Integrity Management
Slickline
Single strand of wire used to lower tools into wellbore.
Spud
The initially step in drilling a well.
Straddles
Devices used to isolate leaks within the tubing string or isolate producing zones but still provide a flow path through the straddle bore.
Swivel
Component of a toolstring that allows free rotational movement.
T
Toolstring
String or series of tools connected together for the purposes of lowering into a wellbore.
Tungsten Stem
Stem filled with heavy tungsten carbide. Used to provide extra weight to a toolstring whilst minimising overall length. Generally not suitable for heavy jarring.
U
Upward Jarring
Impact force that is applied in an upward direction.
V
W
Well Intervention
Gaining access to the wellbore to conduct remedial work.
Wellbore Clean-up
Removal of debris/solids from a wellbore. Often conducted prior to running the completion in a newly drilled well.
WellGlide
a fluted roller centraliser sub, designed by Peak to assist in the conveyance of a wireline toolstring into high angle, deviated wells.
Wireline
Generally implies a multistrand cable used for well intervention.
Z
Zonal Isolation
Isolation of a specific area or section of the producing section of the well bore.