| tcf |
Trillion Cubic Feet (of gas). |
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| TD |
The Total Depth reached in a well by drilling or logging. |
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| Telemetry |
A scheme for receiving data from multiple sensors and controlling devices in a toolstring. |
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| Tension device |
An hydraulic or electronic sensor for measuring logging cable tension. |
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| Threshold |
The least flowrate relative to a flowmeter tool at which it begins to respond. |
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| Tie-in |
The process of aligning graphs of data during a merge, by selecting points that correspond. Eg the start of the first up pass. |
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| Tool bus |
An inter-tool or intra-tool telemetry scheme. |
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| Toolpusher |
Second-in-command of a drilling crew under the drilling superintendent. Responsible for the day-to-day running of the rig and for ensuring that all the necessary equipment is available. |
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| Toolstring |
An assembly of various logging tools and passive devices deployed at the end of a logging cable. |
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| Topsides |
The superstructure of a platform. |
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| Trace |
A curve on a well log. |
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| Tracer |
A substance added to reservoir fluid and/or injected fluid to permit the movements of the fluid to be followed or traced. (PGR) |
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| Tractor |
An electrically operated device used to deploy a toolstring down wells of very high deviation. |
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| Transducer |
A device for converting variations in one physical quantity, as pressure, brightness, etc., quantitatively into variations in another, as voltage, position, etc; esp. a device for converting a non-electrical to an electrical signal. |
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| Tubing |
A small diameter pipe that is inserted into a well as a means of transporting oil or gas to the surface. |
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| TVD |
True Vertical Depth (MIDAS). |
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