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| 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. |
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| 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. |
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| Appraisal drilling |
Drilling to determine physical extent, reserves and likely production rate of a reservoir, together with properties of oil or gas. |
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| Appraisal well |
A well drilled as part of an appraisal drilling program. |
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| 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). |
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| Capping |
Tightly closing a well so that hydrocarbons cannot escape. |
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| 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. |
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| Cement |
Pumped into space between casing and well bore wall in order to hold casing in place. |
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| Choke |
Device to restrict rate of flow during testing of an exploratory discovery. |
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| 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. |
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| Compensator |
Keeps drill-sting stationary while semi-submersible and derrick move. |
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| Conductor |
Wide-diameter pipe from drilling platform to sea-bed to guide drilling and contain drilling fluid. |
About Permian 
