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Oilfield Glossary
The Oilfield Glossary: Where the Oil Field Meets the Dictionary
The Schlumberger Oilfield Glossary is an evergreen, instant reference that takes up no space on your bookshelf and offers many special features:
All DisciplinesDrillingDrilling FluidsFormation EvaluationGeologyGeophysicsHeavy OilOil and Gas BusinessPerforatingProduction EnhancementProduction FacilitiesProduction LoggingProduction TestingReservoir CharacterizationWell CompletionsWell TestingWell Workover More search options
Terms beginning with:
# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Please be kindly advised by the Exploration Terms:
Aero-magnetic surveys Magnetometers, towed by aircraft, help to detect magnetic anomalies or to distinguish geologic features that might appear similar from seismic data alone.
Air gun Air gun array is most common technique used for seismic surveying offshore. Compressed air is released from a chamber to produce shock waves in earth. Annulus
Appraisal drilling Drilling to determine physical extent, reserves and likely production rate of a reservoir, together with properties of oil or gas.
Appraisal well A well drilled as part of an appraisal drilling programme.
Bottom-hole assembly Components, together as a group, that make up lower end of drill-string (drill bit, drill collars, drill pipe and ancillary equipment).
Capping Tightly closing a well so that hydrocarbons cannot escape.
Casing Steel lining used to exclude unwanted fluids; control well pressures; support sides of well bore.
Casing Seat - lowest point at which casing is set.
Casing head - top of casing set in well; part of casing that protrudes above surface and to which control valves and flow pipes are attached.
Cement Pumped into space between casing and well bore wall in order to hold casing in place.
Choke Device to restrict rate of flow during testing of an exploratory discovery.
Circulation Techniques for bringing cuttings from bottom of well bore to surface by continuously pumping drilling mud down through drill-string and up annulus during rotary drilling.
Coiled tubing Used to carry production tubing to bottom of well.
Compensator Keeps drill-sting stationary while semi-submersible and derrick move.
Conductor Wide-diameter pipe from drilling platform to sea-bed to guide drilling and contain drilling fluid.
Deep-Water Discovery An offshore discovery located in at least 200 metres of water.
Derrick Elongated pyramid of latticed steel mounted over bore hole for suspending and rotating drill pipes.
Discovery well An exploratory well that finds hydrocarbons.
Down hole A term to describe tools, equipment and instruments used in well bore.
Drill bit Located at end of drill-string cutting head is generally designed with three cone-shaped wheels tipped with hardened teeth. Drill bits used for extra-hard rock are studded with thousands of tiny industrial diamonds.
Drill collars Heavy pipe-sections that put weight on drill bit.
Drill cuttings Lifted continually to surface during drilling by a circulating-fluid system driven by a pump. To facilitate removal of cuttings, mud is constantly circulated down through drill pipe, out through nozzles in drill bit, and then up to surface through space between drill pipe and well bore through earth (diameter of bit is somewhat greater than that of pipe).
Drilling Muds / Fluid
Drill-string Series of connected 9 metre length drill pipes (joints).
Dry Hole Unsuccessful well, drilled without finding commercial quantities of hydrocarbons.
ExplorationSearch for hydrocarbons by Geological and Geophysical (G&G) surveys that may be followed by exploration drilling.
Exploration well Drilling to determine whether hydrocarbons are present.
Farm-in Transfer of part of an oil or gas interest in consideration for an agreement by transferee(s) to meet certain expenditure that would otherwise have to be undertaken by licensee(s).
Geophysics Branch of science that applies physical principles to study of planet earth.
Gravity surveys Measure density variations in local rock masses. Surveys are based on use of a gravimeter down bore holes.
Horizontal Drilling Technique for cutting a bore hole in geological strata in a horizontal, rather than normal vertical, direction. (see also Horizontal well)
Kick Back pressure in well from invading oil / gas / water.
Killing a well Filling bore with drilling mud of suitable density to stop flow of oil / gas.
Liner Small diameter casing extending into producing layer from just inside bottom of final string of casing cemented in a well.
Modular formation dynamics tester Measures fluid pressures and collects small samples in a well.
PluggingProcess whereby a well that is no longer needed is filled with concrete and abandoned. (see PA).
Rotary Drilling Being coupled to rotating table on derrick floor rotates drill-string.
Rotary Table / Drilling Table Turning device on derrick floor in which drill-string is held and rotated.
Round trip Complete process of pulling out and running in drill-string.
Seismic surveys Measurements of seismic-wave travel. Seismic exploration is divided into refraction and reflection surveys, depending on whether the predominant portion of the seismic waves' travel is horizontal or vertical. Refraction seismic surveys are used in exploration. Seismic reflection surveys detect boundaries between different kinds of rocks; this detection assists in mapping of geologic structures. (See also 3D- Seismic.)
Shale shaker Drilling mud passed over to sieve out cuttings.
Sidetrack Drilling A remedial operation that results in creation of a new section of well bore for purpose of detouring around "junk", redrilling a lost hole or straightening crooked holes.
Spud Commencement of drilling operations.
Suspended discovery An oil or gas field identified by a discovery well but not being produced or developed.
Three-dimensional Seismic / 3-D Seismic Three-dimensional images created by bouncing sound waves off underground rock formations; used to determine best places to drill for hydrocarbons.
Top drive Powerful electric motor that rotates whole drill-string from top down.
Tripping in / out Re-insertion of drill-string / Withdrawing drill-string.
Upstream
Well completion
Well Nomenclature (E&A)
Wildcat
Exploration well drilled in an unproven area. (Term wildcatter comes from West Texas, where in early 1920s drilling crews encountered many wildcats as they cleared locations for exploratory wells. Shot wildcats were hung on oil derricks, and wells became known as wildcat wells.)
The Oilfield Glossary: Where the Oil Field Meets the Dictionary
The Schlumberger Oilfield Glossary is an evergreen, instant reference that takes up no space on your bookshelf and offers many special features:
- Comprehensive: definitions for major oilfield activities
- Accessible: definitions for both the technical generalist and the expert
- Accurate: definitions reviewed by technical experts
- Illustrated: high-quality, full-color photographs and illustrations clarify many definitions
- Thorough: citations of significant technical papers for further reading
- Versatile: streamlined navigation, enhanced search capability and key resource links
- Interactive: on-line capabilities allow for continual expansion and updating based on reader input.
All DisciplinesDrillingDrilling FluidsFormation EvaluationGeologyGeophysicsHeavy OilOil and Gas BusinessPerforatingProduction EnhancementProduction FacilitiesProduction LoggingProduction TestingReservoir CharacterizationWell CompletionsWell TestingWell Workover More search options
Terms beginning with:
# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Please be kindly advised by the Exploration Terms:
Aero-magnetic surveys Magnetometers, towed by aircraft, help to detect magnetic anomalies or to distinguish geologic features that might appear similar from seismic data alone.
Air gun Air gun array is most common technique used for seismic surveying offshore. Compressed air is released from a chamber to produce shock waves in earth. Annulus
Appraisal drilling Drilling to determine physical extent, reserves and likely production rate of a reservoir, together with properties of oil or gas.
Appraisal well A well drilled as part of an appraisal drilling programme.
Bottom-hole assembly Components, together as a group, that make up lower end of drill-string (drill bit, drill collars, drill pipe and ancillary equipment).
Capping Tightly closing a well so that hydrocarbons cannot escape.
Casing Steel lining used to exclude unwanted fluids; control well pressures; support sides of well bore.
Casing Seat - lowest point at which casing is set.
Casing head - top of casing set in well; part of casing that protrudes above surface and to which control valves and flow pipes are attached.
Cement Pumped into space between casing and well bore wall in order to hold casing in place.
Choke Device to restrict rate of flow during testing of an exploratory discovery.
Circulation Techniques for bringing cuttings from bottom of well bore to surface by continuously pumping drilling mud down through drill-string and up annulus during rotary drilling.
Coiled tubing Used to carry production tubing to bottom of well.
Compensator Keeps drill-sting stationary while semi-submersible and derrick move.
Conductor Wide-diameter pipe from drilling platform to sea-bed to guide drilling and contain drilling fluid.
Deep-Water Discovery An offshore discovery located in at least 200 metres of water.
Derrick Elongated pyramid of latticed steel mounted over bore hole for suspending and rotating drill pipes.
Discovery well An exploratory well that finds hydrocarbons.
Down hole A term to describe tools, equipment and instruments used in well bore.
Drill bit Located at end of drill-string cutting head is generally designed with three cone-shaped wheels tipped with hardened teeth. Drill bits used for extra-hard rock are studded with thousands of tiny industrial diamonds.
Drill collars Heavy pipe-sections that put weight on drill bit.
Drill cuttings Lifted continually to surface during drilling by a circulating-fluid system driven by a pump. To facilitate removal of cuttings, mud is constantly circulated down through drill pipe, out through nozzles in drill bit, and then up to surface through space between drill pipe and well bore through earth (diameter of bit is somewhat greater than that of pipe).
Drilling Muds / Fluid
Drill-string Series of connected 9 metre length drill pipes (joints).
Dry Hole Unsuccessful well, drilled without finding commercial quantities of hydrocarbons.
ExplorationSearch for hydrocarbons by Geological and Geophysical (G&G) surveys that may be followed by exploration drilling.
Exploration well Drilling to determine whether hydrocarbons are present.
Farm-in Transfer of part of an oil or gas interest in consideration for an agreement by transferee(s) to meet certain expenditure that would otherwise have to be undertaken by licensee(s).
Geophysics Branch of science that applies physical principles to study of planet earth.
Gravity surveys Measure density variations in local rock masses. Surveys are based on use of a gravimeter down bore holes.
Horizontal Drilling Technique for cutting a bore hole in geological strata in a horizontal, rather than normal vertical, direction. (see also Horizontal well)
Kick Back pressure in well from invading oil / gas / water.
Killing a well Filling bore with drilling mud of suitable density to stop flow of oil / gas.
Liner Small diameter casing extending into producing layer from just inside bottom of final string of casing cemented in a well.
Modular formation dynamics tester Measures fluid pressures and collects small samples in a well.
PluggingProcess whereby a well that is no longer needed is filled with concrete and abandoned. (see PA).
Rotary Drilling Being coupled to rotating table on derrick floor rotates drill-string.
Rotary Table / Drilling Table Turning device on derrick floor in which drill-string is held and rotated.
Round trip Complete process of pulling out and running in drill-string.
Seismic surveys Measurements of seismic-wave travel. Seismic exploration is divided into refraction and reflection surveys, depending on whether the predominant portion of the seismic waves' travel is horizontal or vertical. Refraction seismic surveys are used in exploration. Seismic reflection surveys detect boundaries between different kinds of rocks; this detection assists in mapping of geologic structures. (See also 3D- Seismic.)
Shale shaker Drilling mud passed over to sieve out cuttings.
Sidetrack Drilling A remedial operation that results in creation of a new section of well bore for purpose of detouring around "junk", redrilling a lost hole or straightening crooked holes.
Spud Commencement of drilling operations.
Suspended discovery An oil or gas field identified by a discovery well but not being produced or developed.
Three-dimensional Seismic / 3-D Seismic Three-dimensional images created by bouncing sound waves off underground rock formations; used to determine best places to drill for hydrocarbons.
Top drive Powerful electric motor that rotates whole drill-string from top down.
Tripping in / out Re-insertion of drill-string / Withdrawing drill-string.
Upstream
Well completion
Well Nomenclature (E&A)
Wildcat
Exploration well drilled in an unproven area. (Term wildcatter comes from West Texas, where in early 1920s drilling crews encountered many wildcats as they cleared locations for exploratory wells. Shot wildcats were hung on oil derricks, and wells became known as wildcat wells.)