Coiled Tubing Glossary...

B.O.S.S.: Tool: Ball Operated Shear Sub, a ball operated hydraulic release tool. This tool is used to release the coiled tubing from the bottom hole assembly if it was to become stuck.

Back Off: To unscrew one threaded piece from another. (as a section of pipe)

Back Up: To hold one section of an object while another is being screwed into or out of it.

Bacteria: A large, widely distributed group of typically one-celled micro-organisms.

Bactericide: Anything that destroys bacteria.

Bails: A device made of cylindrical steel bars that supports the elevators and connects them to the traveling block. In cementing operations a single unit of high pressure iron made up of two swivels and short pieces of iron designed to be extremely flexible.

Balance Point: Footage of coiled tubing in the hole where the buoyed weight of the tubing is equal to the well pressure acting against the cross-sectional area. Note, this is a static condition with the pipe full of fluid and does not include frictional forces of the stripper assembly and/or pipe rams, if engaged.

Balanced Plug: a method of placing a plug: Preflush, cement slurry, and spacer fluid are displaced down the drill pipe or tubing with mud until the cement level is about equal in the annulus and drill pipe or tubing. The pipe is then pulled, leaving the plug "balanced" in place.

Ball Sealers: Balls made of nylon, hard rubber, a combination of both or bio-degradable products, designed to shut off perforations.

Ballooning: The increase in diameter and decrease in length of tubing due to the effects of temperature change, cycling or high internal pressure.

Banana Blade: A design of under reamer blade that enables reaming in both RIH and POOH mode. The name reflects the shape and the design minimizes the risk of becoming stuck due to overlying debris.

Barrel: A measure of volume for petroleum products. One barrel is equivalent to 42 U.S. gallons.

Batch: A specific quantity of material that is treated, processed or used in one operation.

Bc: (see Bearden unit of consistency).

Bearden unit of consistency: a standard value of measurement on the firmness of a cement slurry; abbreviated Bc.

Bending Cycle: The act of straightening or bending coiled tubing. One bending cycle for the purpose of CYCLE actually includes six such bends, off, and then back onto the work reel.

BHCT: (see bottom-hole circulating temperature).

BHP: (see Bottomhole pressure)

BHST: (see bottom-hole static temperature).

BHT: Bottomhole temperature

Blind Rams: Rams whose ends are not intended to seal against any coiled tubing. The seal against each other to effectively close the hole.

Blowout: An uncontrolled flow of pressurized wellbore fluids and/or formation fluids from the wellbore or into lower pressured subsurface zones (underground blowout). A blowout occurs when formation pressure is greater than the pressure applied to it by the column of fluids in the wellbore.

Boiling Point: The temperature at which the vapor pressure of the liquid equals that of the surrounding gas or vapor.

Bond: The state of one material adhering or being joined to another material. (as cement to formation)

Boot: The boot provides a solid connection from bare wires to the KEMLON PIN in the SWBPV bulkhead. It consists of a gold plated pin crimped to the wire. A Teflon sleeve to protect the pin and a rubber boot to cover and seal the connection.

BOP: Blowout preventer

Bottom-hole Circulating Pressure: the pressure at the bottom of a well during circulation of any fluid. It is equal to the hydrostatic head plus the annular friction loss required to pump the fluid to the surface plus any back pressure held at the surface.

Bottom-hole Circulating Temperature: the temperature of any fluid at the bottom of a well while it is being circulated; abbreviated BHCT.

Bottom-hole Frac Pressure: The pressure required at the formation face to rupture or fracture the rock.

Bottom-hole Pressure: The pressure in a well at a point opposite the producing formation as recorded by a bottom hole pressure recorder.

Bottom-hole Static Pressure: the pressure at the bottom of a well after the well is shut in long enough to reflect ambient formation pressure.

Bottom-hole Static Temperature: the temperature attained at the bottom of a well after the well is shut in; abbreviated BHST.

Bottoms Up: A complete trip from the bottom of the wellbore to surface.

Bradenhead Squeeze: the process by which hydraulic pressure is applied to a well to force fluid or cement outside the wellbore.

Bradenhead: casing head.

Break Circulation: The point at which circulation is established in a well. Pumping down the work string and returning through the annulus to the surface.

Breakdown Pressure: the amount of pressure needed at the wellhead to rupture the formation in a fracture treatment or a squeeze job.

Breaker: A chemical added to a frac fluid. Used to degrade the gel and change it from a high viscosity to a low viscosity fluid to allow for better flow back.

Bridge plug: A downhole tool that is run and set in casing to isolate a lower zone.

Bridge: An obstruction in the wellbore or tubulars in a well.

Bridging Material: fibrous, flaky, or granular material added to a cement slurry or drilling fluid to aid in sealing formations in which lost circulation has occurred.

Brine: Water that has a large amount of salt dissolved in it.

BS or BS&W: basic sediment, or basic sediment and water.

Bullhead Squeeze: method of forcing well fluid into a formation ahead of the cement to contain the application pressure.

Bullhead: Any pumping procedure in which fluid is pumped into the well against pressure.

Bumped: In cementing operations, pertaining to the point at which the cement plug comes to rest on the float collar.

Buoyancy: the apparent loss of weight of an object immersed in a fluid.

BW Rod Thread: A parallel thread with three threads per inch (3 TPI) similar to the AW THREAD. The thread is square cut and is used in applications of 1.75" OD thread or greater.

Please inform ICoTA to add a glossary term.