G - Physics – 01 – V
Patent
G - Physics
01
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358/4, 324/8
G01V 5/14 (2006.01) E21B 47/00 (2006.01) E21B 47/022 (2006.01) E21B 47/12 (2006.01) G01V 11/00 (2006.01)
Patent
CA 1143790
ABSTRACT A digital mineral logging system acquires data from a mineral logging tool passing through a borehole and transmits the data uphole to an electronic digital signal processor. A predetermined combination of sensors, including a deviometer, is located in a logging tool for the acquisition of the desired data as the logging tool is raised from the borehole. Sensor data in analog format is converted in the logging tool to a digital format and periodically batch transmitted to the surface at a predetermined sampling rate. An identification code is provided for each mineral logging tool, and the code is transmitted to the surface along with the sensor data. The self-identifying too code is transmitted to the digital signal processor to identify the code against a stored list of the range of numbers assigned to that type of tool. The data is transmitted up the d-c power lines of the tool by a frequency shift key transmission technique. At the surface, a frequency shift key demodulation unit transmits the decoupled data to an asynchronous receiver interfaced to the electronic digital signal processor. During a recording phase, the signals from the logging tool are read by the electronic digital signal processor and stored for later processing. During a calculating phase, the stored data is processed by the digital signal processor and the results are outputted to a printer or plotter, or both. In addition, real-time plotting of the mineral logging data may be accomplished while logging up the hole and simultaneously recording all the data for later computation and plotting.
325191
Century Geophysical Corporation
Kirby Eades Gale Baker
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