WellTracking glossary
Gyroscope - a heavy rotating wheel, which axis is free to turn in any direction, and which can set to rotate in any plane, independently of forces tending to change the position of the axis. Any alteration of the inclination of the axis rotation is resisted by a turning movement (gyrostatic moment). The gyroscope is used for wells equipped with casing strings.
Inclination data - the deviation from vertical, irrespective of compass direction, expressed in degrees. For most vertical wellbores, inclination is the only measurement of the path of the wellbore. For intentionally deviated wellbores, or wells close to legal boundaries, directional information is usually also measured. The inclination data of the well is used:
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to provide drilling based on the specified direction
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to define real occurrence depth of the geologic objects
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to create maps and cross-sections based on the well log surveys and the drilling log books.
Inclinometer - a device used for measuring angles of slope (or tilt), elevation or inclination of an object. Inclinometers are used for:
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showing a deviation from the true vertical or horizontal;
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surveying, in order to measure an angle of inclination or elevation;
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measuring the angle of drilling in well-logging applications.
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Formation intercepts - the inlet/outlet spots of the formation drilling.
Well - a term for any perforation through the Earth's surface designed to find and release both petroleum oil and gas hydrocarbons. The well consists of three related objects: target-point (or bottomhole) - object of the TARGET_POINTS class, wellbore (directing polyline) - object of the WELLBORE_GEOMETRY class and wellhead - object of the WELL class.
Bottom hole (target-point) - the bottom of the wellbore being deepened while drilling process.
Wellhead - the surface structure of the well, i.e. the inlet hole of the well.
Wellbore - an oil field term referring to the hole produced when drilling an oil or gas well.
CSV format - a file type that stores tabular data (learn more...).
UTC time - Universal Coordinated Time, UTC is a time standard based on International Atomic Time (TAI) with leap seconds added at irregular intervals to compensate for the Earth's slowing rotation. Leap seconds are used to allow UTC to closely track UT1, which is mean solar time at the Royal Observatory, Greenwich.
The difference between UTC and UT1 cannot exceed 0.9 seconds, so if high precision is not required the general term Universal Time (UT) (without a suffix) may be used.
In casual use, Greenwich Mean Time (GMT) is the same as UTC and UT1. Owing to the ambiguity of whether UTC or UT1 is meant, and because timekeeping laws usually refer to UTC, GMT is avoided in careful writing.
Time zones around the world can be expressed as positive or negative offsets from UTC; UTC replaced GMT as the basis for the main reference time scale or civil time in various regions on January 1, 1972.
(learn more at: http://en.wikipedia.org/wiki/Coordinated_Universal_Time).
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