KONTAKTLOES MAALING AV BOREHULL-KALIBER.

摘要

A method and apparatus for measuring the caliber of a borehole while drilling utilizes a borehole compensated downhole measuring system in both a compensated and a non-compensated manner. A transmitter of the measuring system generates a signal which is received by at least one spaced receiver with the time/phase relationship of the transmission and reception of the signal at each receiver being indicative of the borehole caliber.