METHODS AND APPARATUS FOR RECORDING WELL LOGGING DATA

摘要

In accordance with an illustrative embodiment of the present invention, a recording and displaying apparatus is adapted to record or display well logging signals derived from a well tool in a borehole. The apparatus can record signals derived from a well logging tool of the type which rotates an acoustic transducer while emitting and receiving energy therefrom to thereby scan a borehole wall. Information signals representative of the energy received by the rotating transducer and synchronizing signals representative of the orientation of the transducer are transmitted from the well tool to the surface of the earth. At the surface of the earth, the recording apparatus uses the synchronizing signals to control the sweep of an oscilloscope generated electron beam across an indicating means while modulating the beam intensity with the information signals. A sweep rate control circuit synchronizes the sweep rate with the frequency of the synchronizing signals. The apparatus can also record or display signals derived from a well tool of the type which repetitively emits acoustic energy from a transmitter and receives the energy with one or more nearby acoustic receivers to produce information signals representative of the received energy and synchronizing signals representative of the time of energy emission. The synchronizing signals cause the electron beam to sweep across the indicating means and the information signals are used to modulate either the intensity or vertical deflection of the beam.