Derrick

Derrick

Definition(s)


Derrick (mast)

The steel lower component of a drilling or well servicing rig that supports the crown block, traveling block, and hoisting lines. Derricks and masts may be stationary structures normally requiring dismantling and disassembly when moved from location to location, or may be portable with the capability of being laid down and raised to and from ground level fully assembled.1  

Source(s)


1. API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards
Critical Equipment

Critical Equipment

Definition(s)


Critical equipment

Equipment and other systems determined to be essential in preventing the occurrence of, or mitigating the consequences of an uncontrolled event. Such equipment may include vessels, machinery, piping, blowout preventers, wellheads and related valving, flares, alarms, interlocks, fire protection equipment, and other monitoring, control, and response systems. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards  

Critical equipment

Equipment and other systems determined to be essential in preventing the occurrence of, or mitigating the consequences of an uncontrolled event. Source: API RP 74, Recommended Practice for Occupational Safety for Onshore Oil and Gas Production Operation, First Edition, October 2001 (March 2007). Global Standards  

Critical equipment

Equipment and other systems determined to be essential in preventing the occurrence of or mitigating the consequences of an uncontrolled release. Such equipment may include vessels, machinery, piping, blowout preventers, wellheads and related valving, flares, alarms, interlocks, fire protection equipment and other monitoring, control and response systems. Source: API RP 75, Recommended Practice for Development of a Safety and Environmental Management Program for Offshore Operations and Facilities: Upstream Segment, Third Edition, May 2004. Global Standards  

Critical equipment

Critical equipment refers to vessels, machinery, piping, alarms, interlocks, and controls determined by the management to be vital to preventing the occurrence of a catastrophic release. Source: API RP 750, Management of Process Hazards, First Edition, January 1990. Global Standards
Blowout Preventer (BOP)

Blowout Preventer (BOP)

Definition(s)


Blowout Preventer

Equipment installed at the wellhead to contain wellbore pressure either in the annular space between the casing and the tubulars or in an open hole during drilling, completion, testing, or workover operations.

Source: API STANDARD 16AR, Standard for Repair and Remanufacture of Drill-through Equipment, First Edition, April 2017. Global Standards

Blowout Preventer

Large, specialized valve used to seal, control, and monitor an oil and gas well. Source: API RP 16Q, Recommended Practice for Design, Selection, Operation and Maintenance of Marine Drilling Riser Systems, First Edition, November 1993 (Reaffirmed August 2001). Global Standards

Blowout Preventer

A device attached immediately above the casing, which can be closed to shut in the well. Source: API RP 16Q, Recommended Practice for Design, Selection, Operation and Maintenance of Marine Drilling Riser Systems, First Edition, November 1993 (Reaffirmed August 2001). Global Standards Source: ISO 13624-1:2009, Petroleum and natural gas industries – Drilling and production equipment – Part 1:Design and operation of marine drilling riser equipment. Global Standards  

Blowout Preventer (Annular Type)

A remotely controlled device which can form a seal in the annular space around any object in the wellbore or upon itself. Compression of a reinforced elastomer packing element by hydraulic pressure effects the seal. Source: API RP 16Q, Recommended Practice for Design, Selection, Operation and Maintenance of Marine Drilling Riser Systems, First Edition, November 1993 (Reaffirmed August 2001). Global Standards  

Blowout Preventer (BOP)

Device installed at the wellhead to contain well-bore pressure either in the annular space between the casing and the tubulars or in an open hole during drilling, completion, testing or workover. Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards  

Blowout Preventer (BOP)

A device attached to the wellhead or Christmas tree that allows the well to be closed in with or without a string of pipe or wireline in the borehole. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards  

Blowout Preventer (BOP)

A device attached to the casinghead that allows the well to be sealed to confine the well fluids to the well bore. Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global Standards  

Blowout Preventer

Equipment installed at the wellhead or wellhead assemblies to contain wellbore fluids, either in the annular space between the casing and the tubulars or in an open hole during drilling, completion, testing, or workover operations. Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards  

Blowout Preventer (BOP)

Equipment installed on the wellhead or wellhead assemblies to contain wellbore fluids either in the annular space between the casing and the tubulars, or in an open hole during well drilling, completion and testing operations.
  • NOTE: BOPS are not: gate valves, workover/ intervention control packages, subsea shut-in devices, well control components (per API 16ST), intervention control packages, diverters, rotating heads, rotating circulating devices, capping stacks, snubbing or stripping packages, or non-sealing rams.
  • Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards
Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  

Blowout Preventer (BOP)

Equipment (or valve) installed at the wellhead to contain wellbore pressure either in the annular space between the casing and the tubulars or in an open hole during drilling, completion, testing or workover operations. Source: API SPEC 16A, Specification for Drill-through Equipment, Third Edition, June 2004 (Errata/Supplement November 2004). Global Standards  

Blowout Preventer (BOP)

A device attached to the casing head that allows the well to be sealed to confine the well fluids in the wellbore. Refer to API RP 53 or other relevant standards for further information. Source: API STD 65 – Part 2, Isolating Potential Flow Zones During Well Construction, Upstream Segment, Second Edition, December 2010. Global Standards  

Blowout Preventer (BOP)

“Blowout preventer” means a casing-head control fitted with special gates or rams that can be closed around the drill pipe and completely close the top of the casing if the pipe is withdrawn (dispositif anti-éruption). Source: Canada Oil and Gas Drilling and Production Regulations, C.R.C., c. 1517, February 2013. Regulations  

Blowout Preventer

"Blowout preventer" means a heavy casinghead control fitted with special gates and/or rams which can be closed around the drill pipe or which completely closes the top of the casing. Source: Corporation Commission, Oil and Gas Conservation, Oklahoma Administrative Code 165:10, February 2013. Regulations  

Blowout Preventer (Annular Type)

Remotely controlled device which can form a seal in the annular space around any object in the wellbore or upon itself. NOTE Compression of a reinforced elastomer packing element by hydraulic pressure effects the seal. Source: ISO 13624-1:2009, Petroleum and natural gas industries – Drilling and production equipment – Part 1:Design and operation of marine drilling riser equipment. Global Standards  

Blowout Preventer

“Blowout preventer” means a device attached to the wellhead that allows the well to be sealed to confine the well fluids in the wellbore. Source: Oil and Gas Drilling and Servicing Operations, Michigan Administrative Code R 408, February 8, 2013. Regulations  

Blowout Preventer

A device attached to a casing head that allows the well to be sealed to confine the well fluid in the well bore. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations
Authorized Person

Authorized Person

Definition(s)


Authorized person

A person assigned by an employer to perform or supervise the performance of a specific type of duty or duties at the work site. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards  

Authorized person

A qualified person assigned by an employer to perform or supervise the performance of a specific type of duty or duties at the work site. Source: API RP 74, Recommended Practice for Occupational Safety for Onshore Oil and Gas Production Operation, First Edition, October 2001 (March 2007). Global Standards
Acidizing

Acidizing

Definition(s)


Acidizing

“Acidizing” means the act of pumping an acidic solution into a wellbore to remove any materials from the perforations, pipe, and walls of the producing formation and includes the act of pumping the substance into formations to improve permeability. Source: Oil and Gas Drilling and Servicing Operations, Michigan Administrative Code R 408, February 8, 2013. Regulations

Acidizing

The act of pumping an acidic solution into a wellbore to remove materials from the perforations, pipe, and walls of the producing formation or pumping the solution into formations to improve permeability. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards
Hole

Hole

Definition(s)


Hole

Common term that usually refers to the wellbore.1  

Source(s)


1. API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards
Ground Anchor

Ground Anchor

Definition(s)


Ground anchor (deadman)

Static holding device installed in the ground separate from the  rig structure and to which guyline(s) may be attached. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards
Full Body Harness

Full Body Harness

Definition(s)


Full body harness

Straps which may be secured about a person in a manner that will distribute the fall arrest forces over at least the thighs, pelvis, waist, chest, and shoulders, with means for attaching it to other components of a personal fall arrest system. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards Source: API RP 74, Recommended Practice for Occupational Safety for Onshore Oil and Gas Production Operation, First Edition, October 2001 (March 2007). Global Standards  

Full body harness

“Full body harness” means straps which may be secured about a person in a manner that will distribute the fall arrest forces over at least the thighs, pelvis, waist, chest, and shoulder, with means for attaching it to other components of a personal fall arrest system. Source: State of Wyoming Occupational Safety and Health Rules and Regulations for Oil and Gas Well Drilling, Revised January 8, 2013. Regulations
Freezing Operation

Freezing Operation

Definition(s)


Freezing operation

Creation of a plug by freezing a liquid in a pipe or fitting to confine the pressure while removing defective or inadequate equipment downstream of the plug. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards  

Freezing operation

“Freezing operation” means the creation of a plug by freezing a liquid slug in a pipe fitting. [Mich. Admin. Code R 408 (2013)]. Source: Oil and Gas Drilling and Servicing Operations, Michigan Administrative Code R 408, February 8, 2013. Regulations
Elevator

Elevator

Definition(s)


Elevators

A mechanical device attached to the traveling block that latches around and supports the pipe during hoisting or lowering operations. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards  

Elevator

“Elevator” means a mechanical device attached to the traveling block that latches around and supports the pipe during hoisting. [Mich. Admin. Code R 408 (2013)]. Source: Oil and Gas Drilling and Servicing Operations, Michigan Administrative Code R 408, February 8, 2013. Regulations  

Elevator

A metal mechanical device used in connection with and suspended from a traveling block or hoisting line, to hold pipe or sucker rods in suspension when being hoisted or lowered in a well. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations  
Floorman

Floorman

Definition(s)


Floorman

Member of the rig crew whose work station during hoisting is on the rig floor. Also performs numerous other operating and maintenance duties as directed by the supervisor. May also be referred to as rotary helper, roughneck, driller’s helper, or well puller. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards
Drilling Out

Drilling Out

Definition(s)


Drilling out

Refers to drilling and removal of material that normally remains in the casing or wellbore after cementing. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards
Derrickman

Derrickman

Definition(s)


Derrickman

Person whose work station is usually up in the derrick while pipe or rods are being hoisted or lowered into the hole. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards
Deadline

Deadline

Definition(s)


Deadline

The end of the drilling line that is not reeled onto the hoisting drum of the rig. This end of the drilling line is anchored (usually to the derrick substructure) and does not move as the traveling block is hoisted, hence the term deadline. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards
Conductor Pipe

Conductor Pipe

Definition(s)


Conductor pipe

A relatively short string of large diameter pipe which is installed to keep the top of the hole open and provide a means of returning the drilling fluid from the wellbore to the surface drilling fluid system until the first casing string is set in the well. Conductor pipe may also be used in well control when drilling to surface casing depth. Conductor pipe may or may not be cemented. Source: API BULLETIN E3, Environmental Guidance Document: Well Abandonment and Inactive Well Practices for U.S. Exploration and Production Operations, First Edition, January 1993 (Reaffirmed June 2000). Global Standards

Conductor pipe

A relatively short string of large diameter pipe that is set to keep the top of the hole open and provide a means of returning the upflowing drilling fluid from the wellbore to the surface drilling fluid system until the first casing string is set in the well. Conductor pipe may also be used in well control. Conductor pipe is usually cemented. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards  

Conductor pipe

A relatively short string of large diameter pipe that is set to keep the top of the hole open and provide a means of returning the up flowing drilling fluid from the wellbore to the surface drilling fluid system until the first casing string is set in the well. Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards  

Conductor pipe

“Conductor pipe” means steel casing, either driven or set through the soil, and/or unconsolidated rock materials and into bedrock for the purpose of isolating near surface water, and such unconsolidated rock materials from the well bore. Source: Division of Mineral Resources Management - Oil and Gas, Ohio Administrative Code, Chapter 1501:9, January 2012. Regulations  

Conductor pipe

Conductor pipe—A short string of large-diameter casing used to stabilize the top of the wellbore in shallow unconsolidated formations. Source: Oil and Gas Wells, Pennsylvania Code, Title 25, Chapter 78, December 2012. Regulations            
Combustible Liquid

Combustible Liquid

Definition(s)


Combustible Liquid (Class II, IIIA, and IIIB Liquids)

A liquid having a flash point at or above 100°F (37.80°C). Combustible liquids are subdivided as follows: Class II liquids, those having flash points at or above l00°F (37.8°C) and below 140°F (60°C). Class IIA liquids, those having flash points at or above 140°F (60°C) and below 200°F (93°C). Class IIIB liquids, those having flash points at or above 200°F (93°C). (See NFPA 30.) Source: API RP 14G, Recommended Practice for Fire Prevention and Control on Fixed Open-type Offshore Production Platforms: Upstream Segment, Fourth Edition, April 2007. Global Standards

Combustible Liquid

Any liquid having a flashpoint at or above 100 °F (37.8 °C). Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards  

Combustible Liquid

Any liquid having a flash-point at or above 100 °F. Source: API RP 74, Recommended Practice for Occupational Safety for Onshore Oil and Gas Production Operation, First Edition, October 2001 (March 2007). Global Standards  

Combustible Liquid

Any material which has a fluidity greater than that of 300 penetration asphalt when tested in accordance with American Society For Testing and Materials. Designation D5-86, Standard Test Method For Penetration of Bituminous Materials, pages 1-5, which is hereby incorporated by reference. Combustible liquids shall be subdivided as follows: Class II liquids shall include those having flash points at or above 100oF (37.8oC) and below 140oF (60oC). Class IIIA liquids include those having flash points at or above 140oF (60oC) and below 200oF (93.4oC). Class IIIB liquids shall include those having flash points at or above 200oF (93.4oC). Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations      
Circulate

Circulate

Definition(s)


Circulate

Cycling fluid from the surface through the pipe and back to the surface through the annular space. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards
Christmas Tree

Christmas Tree

Definition(s)


Christmas tree

An assembly of valves, fittings, chokes, and gauges used in monitoring and controlling producing, injection, and inactive wells. The Christmas tree is assembled at the top of the well starting with the uppermost flange of the tubing head. Source: API BULLETIN E3, Environmental Guidance Document: Well Abandonment and Inactive Well Practices for U.S. Exploration and Production Operations, First Edition, January 1993 (Reaffirmed June 2000). Global Standards

Christmas tree

The valves and fittings assembled at the top of a completed well to control the flow of hydrocarbons and other fluids. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards  

Christmas tree

The valves and fittings assembled at the top of a completed well to control the flow of hydrocarbons and other fluids. See API Spec 6A. Source: API RP 74, Recommended Practice for Occupational Safety for Onshore Oil and Gas Production Operation, First Edition, October 2001 (March 2007). Global Standards  

Christmas tree

Assembly of equipment, including tubing-head adapters, valves, tees, crosses, top connectors and chokes attached to the uppermost connection of the tubing head, used to control well production. Source: API SPEC 6A, Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition, October 2010 (Addendum November 2012). Global Standards  

Christmas tree

The collection of fittings and valves, on the top of the casing, controlling the hydrocarbon production rate. Source: IADC UBO / MPD Glossary, December 2011. Global Standards  

Christmas tree

“Christmas tree” means the valves and fittings assembled at the top of a completed well to control the flow of hydrocarbons and other fluids. [Mich. Admin. Code R 408 (2013)]. Source: Oil and Gas Drilling and Servicing Operations, Michigan Administrative Code R 408, February 8, 2013. Regulations 
Cementing

Cementing

Definition(s)


Cementing

Making cement into a slurry and pumping it into a wellbore to perform functions such as supporting casing, isolating formations behind casing, protecting fresh water sands, and sealing perforations in casing. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards  

Cementing

“Cementing” means the act of pumping a slurry into a wellbore to perform functions such as supporting and sealing casing, isolating formation behind casing, protecting freshwater formations, and sealing perforations in casing. [Mich. Admin. Code R 408 (2013)]. Source: Oil and Gas Drilling and Servicing Operations, Michigan Administrative Code R 408, February 8, 2013. Regulations
Cellar

Cellar

Definition(s)


Cellar

Excavation around the wellhead to provide space for items of equipment at the top of the wellbore. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards Source: API RP 74, Recommended Practice for Occupational Safety for Onshore Oil and Gas Production Operation, First Edition, October 2001 (March 2007). Global Standards  

Cellar

A pit beneath the rig floor to provide additional height between the rig floor and the wellhead and to allow the installation of the bops / rotating head / rotating diverter, rat hole mouse hole etc. Source: IADC UBO / MPD Glossary, December 2011. Global Standards  

Cellar

“Cellar” means an excavation around the wellhead to provide space for items of equipment at the top of the wellbore. Source: Oil and Gas Drilling and Servicing Operations, Michigan Administrative Code R 408, February 8, 2013. Regulations  

Cellar

An excavation around the well head to provide space for equipment at the top of the well bore. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations  
Catwalk

Catwalk

Definition(s)


Catwalk

Elongated platform adjacent to the rig floor where pipe is laid out and lifted into the derrick. The catwalk is connected to the rig floor by a pipe ramp. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards  

Catwalk

“Catwalk” means a elongated platform to the side of a rig where pipe is laid out and lifted into the derrick. Source: Oil and Gas Drilling and Servicing Operations, Michigan Administrative Code R 408, February 8, 2013. Regulations  
Cathead

Cathead

Definition(s)


Catline, Cathead

Catline is a line powered by the cathead, which is a concave, rotating, pulley-type device mounted on the end of the cat shaft of the drawworks. Catlines are used to lift or pull equipment around a rig. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards  

Cathead

“Cathead” means a rotating device mounted on the end of a shaft of the draw works. Source: Oil and Gas Drilling and Servicing Operations, Michigan Administrative Code R 408, February 8, 2013. Regulations  

Cathead

Unless referred to as “automatic” cathead, means a spool shaped metal mechanical device mounted on the end of a shaft on which a rope is wrapped. The rotating cathead imparts a pulling power to the rope that is wrapped on it. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations  
Catline

Catline

Definition(s)


Catline, cathead

Catline is a line powered by the cathead, which is a concave, rotating, pulley-type device mounted on the end of the cat shaft of the drawworks. Catlines are used to lift or pull equipment around a rig. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards  

Catline

A rope, usually reeved on a crown block sheave in a derrick or mast, for the primary purpose of lifting and transferring materials from one place to another about the derrick or mast floor. A rotating cathead imparts the pulling power to the catline that is wrapped on it. Source: Petroleum Safety Orders--Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations  
Blowout Preventer Remote Control

Blowout Preventer Remote Control

Definition(s)


Blowout preventer remote control

A set of control tools that can be used to actuate the blowout preventer from a position some distance away from the blowout preventer, usually the rig floor or accumulator. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards
Bypass

Bypass

Definition(s)


Bypass

Usually refers to a pipe connection around a valve or other control mechanism. A bypass is installed in such cases to permit passage of fluid through the bypass line while adjustments or repairs are made on the control that is bypassed. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards
Breaking Out Pipe

Breaking Out Pipe

Definition(s)


Breaking out pipe

Operation of unscrewing a pipe section. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards
Blocks, Crown, and Traveling

Blocks, Crown, and Traveling

Definition(s)


Blocks, Crown, and Traveling

The fixed upper and movable lower blocks, respectively, of the block and tackle assembly on a rig that raises and lowers the drill string or tubing. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards  

Blocks, Crown, and Traveling

“Blocks, crown, and traveling” means the fixed upper and movable lower blocks, respectively, of the block and tackle assembly on a rig that raises and lowers the drill string or tubing. Source: Oil and Gas Drilling and Servicing Operations, Michigan Administrative Code R 408, February 8, 2013. Regulations
Back Up

Back Up

Definition(s)


Back up

Refers to the act of “backing up” or preventing rotation of one section of pipe or rods while another is screwed out of or into it. Also applied to screwing nuts on or off bolts. A backup wrench refers to any wrench being used to hold the pipe, rods, or bolt. Backup tongs refers to the pipe tongs suspended in the derrick and used to hold a section of pipe while another section is screwed out of or into it by use of other tongs. The backup man is the crew member who operates the backup tongs. The backup position refers to the workstation of the backup man. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards
Annular Space

Annular Space

Definition(s)


Annular space

Space surrounding pipe in the wellbore. The outer wall of the annular space may be open hole or pipe. Source: API RP 54, Recommended Practice for Occupational Safety for Oil and Gas Well Drilling and Servicing Operations, Third Edition, August 1999 (2007). Global Standards
TWA

TWA

Definition(s)


TWA

Time weighted average. Source: API RP 49, Recommended Practice for Drilling and Well Servicing Operations Involving Hydrogen Sulfide, Third Edition, May 2001. Global Standards Source: API RP 98, Personal Protective Equipment Selection for Oil Spill Responders, First Edition, August 2013. Global Standards  

TWA

Average airborne exposure in any 8-hour work shift of a 40-hour workweek that shall not be exceeded (see 29 CFR 1910.1000, Table Z2). Source: API RP 98, Personal Protective Equipment Selection for Oil Spill Responders, First Edition, August 2013. Global Standards