| RBT |
Radial Bond Tool. |
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| Recoverable reserves |
That proportion of the oil and/gas in a reservoir that can be removed using currently available techniques. |
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| Recovery factor |
The ratio of recoverable oil and/or gas reserves to the estimated oil and/or gas in place in the reservoir. |
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| Reservoir |
The underground formation where oil and gas has accumulated It consists of a porous rock to hold the oil or gas, and a cap rock that prevents its escape. |
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| Resolution |
Smallest change that can be measured by a sensor. |
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| RIH |
Run In Hole. |
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| Riser (drilling) |
A pipe between a seabed BOP and a floating drilling rig. |
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| Riser (production) |
The section of pipework that joins a seabed wellhead to the Christmas tree. |
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| Rotation Calibration |
Part of the calibration of an inclinometer, ensuring accurate measurement of tool rotation relative to the top of a slanted hole or tubular. |
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| Roughneck |
Drill crew members who work on the derrick floor, screwing together the sections of drillpipe when running or pulling a drillstring. |
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| Roustabout |
Drill crew members who handle the loading and unloading of equipment and assist in general operations around the rig. |
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| Run |
A single well entry, comprising all the passes and logs performed. |
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