For your convenience, we’ve gathered a glossary of common industry terms in one location.


Can be a combination of galling and abrasive wear. Normally, the orientation of this damage is in the longitudinal direction. Can be inconsistent depending on the source.

Blind Ram

Component of a Blowout Preventor that is used to seal a well bore – usually activated after the string is cut by a shear ram, or if no string is present.

Blowout Preventor (BOP)

Equipment which contains a series of hydraulically controlled rams, used to control and close the well in the event of an uncontrolled event.

Bottom Hole Assembly (BHA)

Downhole tools conveyed using Coiled Tubing. Used to perform various coil tubing operations, and are designed specifically for the type of operation to be performed.

Coiled Line Pipe

Coiled Line Pipe is a continuously milled length of steel tubing. The pipe is externally coated in line before spooling and final testing. It is ideally suited for well tie-ins, long flowlines and pipelines. Coiled Line Pipe allows for a project to be completed without field welding.

Coiled Tubing Reel

The component of a Coiled Tubing unit used to spool string – either on a skid or trailer

Coiled Tubing Unit

Equipment consisting of components which usually include a control cabin, coiled tubing reel and coiled tubing, injector head, gooseneck, power pack, and well control components.

Control Cabin

Usually located behind a coiled tubing reel, a control cabin houses all the controls that are necessary to operate a coiled tubing unit

Corrosion Resistant Alloy

Metals combined to enhance resistance from corrosion, promoting longer protection


Technically advanced, cost-efficient coiled tubing for service in challenging downhole environments

Eddy Test

Type of Electromagnetic testing done on tubing to detect any abnormalities


The Metric used to quantify plastic deformation sustained by coiled tubing operations


Coiled Tubing string which has been put through a process to remove the a flash bead made at the weld.  Flash-free strings are more resistant to corrosion.


Essential part of a Coiled Tubing injector head which guides the coiled tubing string into the injector head.

Hydraulic Fracking

Commonly referred to as “fracking,” is a well stimulation technique involving high pressure injection of fluid containing sand and other proppants to increase the permeability in a targeted geologic formation


Pressure testing performed on coiled tubing at a specified internal pressure and duration to confirm its strength and integrity

Injector Head

Typically at the top of a wellhead, a coiled tubing string enters the injector head from above and regulates direction (run in hole or pull out of hole), and speed of the string.  It is controlled by the operator in the control cabin with the use of a closed loop hydraulic system.


A well event wherein a significant amount of drawdown has occured to where the hydrostatic head of the well is in a significant underbalanced condition that can potentially lead to a well control situation.

Lateral Length

Measurement of a wells horizontal length. Typically where horizontal fracturing is performed

Outside Diameter (O.D.)

Measurement of the diameter of a pipe

Pipe Ram

Component of a Blowout Preventor that is used to create a seal between well bore and the string

Power Pack

System that provides hydraulic power to the coiled tubing unit

Pressure Control Equipment

Equipment that helps maintain the pressure of a wellbore during well intervention

Primary Barrier

The initial barrier for containing pressure.  It is normally closed. An example of a primary barrier is a Stripper or Packer

Secondary Barrier

Normally open, this is activated when the primary barrier fails.

Pull Out Of the Hole (POOH)

Removal of coiled tubing string out from the wellbore

Run In Hole (RIH)

Process of running coiled tubing string into the wellbore

Shear Ram

Usually used as a last line of defense in pressure control, Shear Ram cuts the string in order for the blowout preventor to be closed completely to seal the wellbore

Slip Ram

Component of a Blowout Preventor that is used to close on to string to restrict any axial movement. It is most commonly activated when a kick or blowout occors.


Global Tubing’s patented coiled tubing technology which eliminates bias-weld fatigue spikes for longer running lengths.  SMARTaper increases horizontal reach and adds strength in high-fatigue zones while managing the overall weight of the coiled tubing strings.


Equipment that is used to store, transport, and operate the coiled tubing string during a coiled tubing job

String Design

Essential part of the coiled tubing manufacturing process which dictates the life of the coiled tubing and to maximize productivity


Used to seal or contain well pressure or fluids during workover or intervention operations

Total Depth

Vertical length of well from surface to the end

Tungsten Inert Gas (TIG)

Arc welding process that uses a non-consumable tungsteen electrode to produce a weld

Ultrasonic Thickness (UT)

Measuring equipment that uses ultrasonic waves to calculate the strings thickness

Wall Thickness

Measurement between interior diameter and outside diameter.

Well Intervention

Operation performed on an oil or gas well in all cycles of its production life.


Compontent of an oil or gas well that provides the production well pressure control


The use of electric cables that are lowered into a well to perform various interventions such as logging, perforating, plug placement, etc.