Measuring and testing – Borehole or drilling – Downhole test
Patent
1979-04-06
1980-10-14
Myracle, Jerry W.
Measuring and testing
Borehole or drilling
Downhole test
33313, 364422, 367 81, E21B 47022
Patent
active
042274052
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 acquistion 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 tool 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.
REFERENCES:
patent: 3691456 (1972-09-01), Warren
patent: 3791043 (1974-02-01), Russell
patent: 3991611 (1976-11-01), Marshall et al.
patent: 4012712 (1977-03-01), Nelligan
Century Geophysical Corporation
Myracle Jerry W.
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