| Abandon |
To cease work on a well which is non-productive, to plug off the well with cement plugs and salvage all recoverable equipment Also used in the context of field abandonment. |
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| Accelerometer |
Device used to measure well deviation with high accuracy by way of measuring acceleration due to gravity. Used with differential pressure density tools (eg FDD) for well deviation correction and in horizontal wells to assist in interpretation. |
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| Acquisition (Warrior module) |
The recording of data in surface readout mode using Warrior software |
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| ACTEL |
Brand name of programmable logic array used in many Sondex tools for the downhole processing of data. |
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| Actuator |
Component attached to an MIT finger to allow the finger position to be measured. |
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| Adaptor |
A short, threaded piece or coupling used to adapt parts of the logging tool that cannot otherwise be coupled together because of difference in thread size or design. |
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| Annex B |
Operator's development plan for an offshore installation. It requires government approval before it can be implemented. |
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| Annulus |
The space between the drillstring and the well wall, or between casing strings, or between the casing and the production tubing. |
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| API unit |
A unit of counting rate used for scaling gamma ray curves (see PGR tool). |
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| Appraisal Well |
A well drilled as part of an appraisal drilling programme which is carried out to determine the physical extent, reserves and likely production rate of a field. |
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| Associated Gas |
Natural gas associated with oil accumulations, which may be dissolved in the oil at reservoir conditions or may form a cap of free gas above the oil. |
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| Attenuation |
Photoelectric absorption of gamma rays for the FDR; decrease in signal strength for telemetry |
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