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Caliper log
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Caliper log : ウィキペディア英語版
Caliper log

A caliper log is a well logging tool that provides a continuous measurement of the size and shape of a borehole along its depth〔 Schlumberger Oilfield Glossary http://www.glossary.oilfield.slb.com/Display.cfm?Term=caliper%20log〕 and is commonly used in hydrocarbon exploration when drilling wells. The measurements that are recorded can be an important indicator of cave ins or shale swelling in the borehole, which can affect the results of other well logs.
==Process==
The caliper tool measures the variation in borehole diameter as it is withdrawn from the bottom of the hole, using two or more articulated arms that push against the borehole wall. Each arm is typically connected to a potentiometer which causes the resistance to change as the diameter of the borehole changes, creating a varying electrical signal that represents the changing shape of the borehole. This variation in output is translated into changes of diameter after a simple calibration and the caliper log is printed as a continuous series of values of hole diameter with depth.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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