A Caliper log tool measures the size and shape of a hole. The simple caliper measures a continuous vertical profile of the hole's diameter. Geometry, a diameter of a Circle is any straight Line segment that passes through the center of the circle and whose Endpoints are on the The mechanical caliper measures the variation in bore hole diameter as it is withdrawn vertically from the bottom. It is constructed with two articulated arms that push against the bore hole wall to take measurements. Measurement is the process of estimating the magnitude of some attribute of an object such as its length or weight relative to some standard ( unit of measurement) such as The arms show variable movements of the cursor by measuring electrical resistance, creating electrical variation. The variation in output is translated into changes of diameter after a simple calibration. Calibration is the process of establishing the relationship between a measuring device and the units of measure
The caliper log is printed as a continuous value of hole diameter with depth.
Known challenges with caliper logging include borehole spiralling. The position of the drill bit may precess as it drills, leading to spiraling shapes in the wellbore wall, as if the hole had been drilled by a screw. For the ficitonal character see Drill Bit (Transformers. Drill bits are cutting tools used to create cylindrical holes A screw is a shaft with a helical groove or thread formed on its surface and provision at one end to turn the screw If the arms of the caliper log follow the grooves of the spiral, it will report too high an average diameter. Moving in and out of the grooves, the caliper will give erratic or periodically varying readings.
See also
Gamma ray logging is a method of measuring naturally occuring Gamma radiation to characterize the rock or sediment in a Borehole. Resistivity logging is a method of characterizing the rock or sediment in a Borehole by measuring its electrical resistivity. Density logging is a Well logging tool determining rock Bulk density along a Wellbore. Sonic logging shows a formation’s interval transit time designated Dt. The spontaneous potential log, commonly called the self-potential log or SP log, is a measurement taken by Oil industry well loggers to characteriseDapyx Software network: MP3 Explorer | Ebook Manager | Zenithic