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.

Acidizing and Stimulation

For wells that are older and have decreased production values, Coiled Tubing (CT) interventions allows for a targeted delivery of chemicals to the formation to enhance oil/gas recovery.

Annular Fracturing

Performed with CT with an inflatable bottom hole assembly, whereby fracturing fleets are able to pump onto the annulus of the CT and fracture the formation in specific areas.

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 Preventer (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.


Allows for isolating specific depths of the well or performing cement squeezes into the formation.


Can remove any sand bridges, paraffin plugs or hydrocarbon build-up from wells.

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.


Using coiled tubing (CT) with a multitude of Bottomhole assemblies with profiles designed to capture any “fish” left downhole.


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.

Gas Lifting

For wells with high water content, CT operations can be performed by pumping N2 or CO2 to reduce the hydrostatic pressure on the formation and encourage well production.


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 occurred 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.


Measuring downhole parameters, such as Bottomhole pressure, temperature or casing integrity by equipping CT with an e-line coupled with a real-time data acquisition Bottomhole assembly.

Open-Hole Drilling

A method of drilling wells using a coiled tubing (CT) unit with an e-line cable and a steerable bottom-hole assembly.

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.

Plug Milling

Performed after wireline plug-and-perforate operations, where the plugs are evacuated from the well using a mill Bottomhole assembly to enable well production.

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

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.

Secondary Barrier

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

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 occurs.


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.


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

Well Intervention

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


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

Certificates held by Dayton manufacturing facility.