Borehole televiewer system depth monitoring and recording system

Abstract

A method and an apparatus for recording the depth of a well logging apparatus is provided. The method and apparatus include the direct acquisition of broad depth information from the logging system conversion of the broad depth information to an acceptable digital signal and recording that signal on the audio track of a video cassette recorder. A microcontroller is used to convert broad depth information from either the logging system or the video cassette recorder (in the playback mode) to actual depth and depth rate for use by other displays and plotters.

What is claimed is: 
     
       1. A depth system for measuring and recording the depth of a well logging tool comprising: a) a depth signal interface for producing a first plurality of pulses corresponding to changes in the depth of the well logging tool;   b) a microcontroller electrically connected to said depth signal interface for transforming said first plurality of electrical pulses to a digital serial bit stream using a frequency burst technique wherein the frequency of a burst is in the audio frequency range, and for developing a digital well logging speed signal;   c) logging cable interface device electrically connected to the well logging tool for transmitting data from the well logging tool and a synchronizing pulse;   d) an analog vido recording device electrically connected to said microcontroller and said logging cable interface device for recording said digital serial bit stream a predetermined time after said synchronizing pulse on a single audio channel of the analog video recording device; and   e) a display interface in electrical communication with the microcontroller for generating a video display signal said video display including the well logging speed signal.   
     
     
       2. The system of claim 1 wherein said audo frequency source has a frequency of between 100 and 20,000 Hz. 
     
     
       3. The system of claim 1 wherein said audio frequency source has a frequency of 4800 Hz. 
     
     
       4. The system of claim 1 wherein said encoder has an output data rate of 600 Baud. 
     
     
       5. The system of claim 1 wherein said recording device has a playback circuit and a recording circuit. 
     
     
       6. The system of claim wherein said microcontroller has a serial output for computer. 
     
     
       7. The system of claim 1 wherein said microcontroller produces a five word frame corresponding to the depth of the well logging tool. 
     
     
       8. A depth system for measuring and recording the depth of a well logging tool comprising: a) a depth signal interface for producing a first plurality of pulses corresponding to changes in depth of the well logging tool;   b) a microcontroller electrically connected to said depth signal interface for transforming said first plurality of electrical pulses to a digital serial bit stream using a frequency burst technique wherein the frequency of a burst is in the audo frequency range;   c) logging cable interface device electrically connected to the well loggin gtool for transmitting data fro the well logging tool and a synchronizing pulse; and   d) an analog video recording device electrically connected to said microcontroller and said logging cable interface device for recording said digital serial bit stream a predeterined time after said synchronizing pulse on a single audio channel of the analog video recording device.