Downhole Tractor

Downhole Tractor

Definition(s)

Downhole Tractor

An electric or electro-hydraulic system used to deploy tools, equipment and perforating guns in horizontal or highly deviated wells. Source: API RP 67, Recommended Practice for Oilfield Explosives Safety, Upstream Segment, Second Edition, May 2007. Global Standards
Detonator Safety Tube

Detonator Safety Tube

Definition(s)

Detonator Safety Tube

A tubular vessel used to contain the detonator during electric arming designed to contain the fragments and most of the blast should the detonator inadvertently function. Source: API RP 67, Recommended Practice for Oilfield Explosives Safety, Upstream Segment, Second Edition, May 2007. Global Standards
Chemical Cutter

Chemical Cutter

Definition(s)

Chemical Cutter

A downhole tool used to sever tubular goods in pipe recovery operations utilizing the action of bromine trifluoride to sever ferrous metals. Source: API RP 67, Recommended Practice for Oilfield Explosives Safety, Upstream Segment, Second Edition, May 2007. Global Standards
Charged Explosive Device

Charged Explosive Device

Definition(s)

Charged Explosive Device

A mechanical device to which the explosive components have been inserted or attached, with the exception of the initiating device (see unarmed). Sometimes used interchangeably with loaded explosive device. Source: API RP 67, Recommended Practice for Oilfield Explosives Safety, Upstream Segment, Second Edition, May 2007. Global Standards
Cathodic Protection System

Cathodic Protection System

Definition(s)

Cathodic Protection System

A method of corrosion control utilizing an impressed DC current making the structure a cathode, minimizing or eliminating corrosion. Source: API RP 67, Recommended Practice for Oilfield Explosives Safety, Upstream Segment, Second Edition, May 2007. Global Standards
Cable Safety Circuit

Cable Safety Circuit

Definition(s)

Cable Safety Circuit

A circuit which is an integral portion of the electric wireline unit which opens the electric wireline cable to the application of current and resistively shunts the conductor to the cable armour. Source: API RP 67, Recommended Practice for Oilfield Explosives Safety, Upstream Segment, Second Edition, May 2007. Global Standards
Bullet Perforating Gun

Bullet Perforating Gun

Definition(s)

Bullet Perforating Gun

A perforating gun utilizing propellant-driven hardened steel bullets to penetrate the casing, cement and formation. Their use has been largely supplanted by jet perforating but is still used. Source: API RP 67, Recommended Practice for Oilfield Explosives Safety, Upstream Segment, Second Edition, May 2007. Global Standards
Blasting Ohmmeter/Blasting Multimeter/Blasting Galvanometer

Blasting Ohmmeter/Blasting Multimeter/Blasting Galvanometer

Definition(s)

Blasting Ohmmeter/Blasting Multimeter/Blasting Galvanometer

A test instrument with built-in current limiting features used to measure electrical resistance or conductivity in a blasting circuit. Source: API RP 67, Recommended Practice for Oilfield Explosives Safety, Upstream Segment, Second Edition, May 2007. Global Standards
Ballistic Arming

Ballistic Arming

Definition(s)

Ballistic Arming

The mechanical alignment of all the elements of an explosive train for the purpose of unimpeded transfer of the detonation wave. Source: API RP 67, Recommended Practice for Oilfield Explosives Safety, Upstream Segment, Second Edition, May 2007. Global Standards
Arming

Arming

Definition(s)

Arming

The process of mechanically and/or electromechanically attaching a detonator or initiating device to a loaded explosive device. Source: API RP 67, Recommended Practice for Oilfield Explosives Safety, Upstream Segment, Second Edition, May 2007. Global Standards
Armed Explosive Device

Armed Explosive Device

Definition(s)

Armed Explosive Device

A loaded explosive device to which the detonator or initiating device has been secured mechanically and/or electromechanically and is ready for use. Source: API RP 67, Recommended Practice for Oilfield Explosives Safety, Upstream Segment, Second Edition, May 2007. Global Standards
WOB

WOB

Definition(s)

WOB

Weight on bit. Source: API RP 65, Cementing Shallow Water Flow Zones in Deepwater Wells, First Edition, September 2002 (August 2003). Global Standards
Flow Checks

Flow Checks

Definition(s)

Flow Checks

An observation, usually by ROV when riserless, of the condition of the well during a non-circulating period to determine if flow is occurring. Source: API RP 65, Cementing Shallow Water Flow Zones in Deepwater Wells, First Edition, September 2002 (August 2003). Global Standards
Critical Static Gel Strength

Critical Static Gel Strength

Definition(s)

Critical Static Gel Strength

Gel strength of the cement that results in hydrostatic decay producing an exactly balanced condition in the well. Source: API RP 65, Cementing Shallow Water Flow Zones in Deepwater Wells, First Edition, September 2002 (August 2003). Global Standards
BML

BML

Definition(s)

BML

Below mud line. Source: API RP 65, Cementing Shallow Water Flow Zones in Deepwater Wells, First Edition, September 2002 (August 2003). Global Standards Source: Deepwater Well Control Guidelines. IADC Guidelines
Working Pressure Rating

Working Pressure Rating

Definition(s)

Working Pressure Rating

The maximum pressure at which an item is designed for safe operation. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards
Wellhead

Wellhead

Definition(s)

Wellhead

The point at which fluids exit the wellbore below the annular sealing device via the vent line. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards  

Wellhead

All permanent equipment between the uppermost portion of the surface casing and the tubing-head adapter connection. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards
Vent Outlet

Vent Outlet

Definition(s)

Vent Outlet

The point at which fluids exit the wellbore below the annular sealing device via the vent line. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards
Vent Line Valve

Vent Line Valve

Definition(s)

Vent Line Valve

A full-opening valve which facilitates the shut-off of flow or allows passage of diverted wellbore fluids through the vent line. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards
Vent Line

Vent Line

Definition(s)

Vent Line

The conduit that directs the flow of diverted wellbore fluids away from the drill floor to the atmosphere. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards
Usable Fluid Volume

Usable Fluid Volume

Definition(s)

Usable Fluid Volume

Usable fluid volume is defined as that fluid recoverable from an accumulator between the limits of the accumulator operating pressure and the pre-charge pressure, or the shut-off pressure, for the hydraulic operating system. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards
Torus

Torus

Definition(s)

Torus

A convex profile; shaped like a doughnut. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards
Telescopic (Slip) Joint Packer

Telescopic (Slip) Joint Packer

Definition(s)

Telescopic (Slip) Joint Packer

A torus-shaped, hydraulically or pneumatically actuated, resilient element between the inner and outer barrels of the telescopic (slip) joint which serves to retain drilling fluid inside the marine riser. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards
Switchable Three-Way Target Valve

Switchable Three-Way Target Valve

Definition(s)

Switchable Three-Way Target Valve

All natural gas except sour gas and casinghead gas. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards
Standard Well Kill Procedure

Standard Well Kill Procedure

Definition(s)

Standard Well Kill Procedure

Any of industry’s proven techniques to control a flowing well wherein well control is obtained through pumping drilling fluid of increased density at a predetermined pumping rate with BOP(s) closed and simultaneously controlling casing and drill pipe surface pressures by varying choke manifold choke settings until the well is stable and static with zero surface pressure. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards  
Spool

Spool

Definition(s)

Spool

Refer to Drilling Spool. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards
Rotary Support Beams

Rotary Support Beams

Definition(s)

Rotary Support Beams

The steel beams of a substructure that support the rotary table. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards
Rotating Head Or Rotating Drilling Head

Rotating Head Or Rotating Drilling Head

Definition(s)

Rotating Head Or Rotating Drilling Head

A rotating, low pressure sealing device used in drilling operations utilizing air, gas, or foam (or any other drilling fluid whose hydrostatic pressure is less than the formation pressure) to seal around the drill stem above the top of the BOP stack. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards
Remote Controlled Valve

Remote Controlled Valve

Definition(s)

Remote Controlled Valve

A valve that is controlled from a remote location. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards  
Pressure Equalization Valve (Dump Valve)

Pressure Equalization Valve (Dump Valve)

Definition(s)

Pressure Equalization Valve (Dump Valve)

A device used to control bottom-riser annulus pressure by establishing direct communication with the sea. Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards