Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1994-03-14
1998-09-22
O'Shea, Sandra L.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
343720, 364422, G01V 330
Patent
active
058119728
ABSTRACT:
The present invention is directed to a measurement-while-drilling logging tool which includes a minimum number of analog electrical and electronic components, and which instead utilizes digitally-controlled electronic and electrical components to obtain an accuracy which is not possible utilizing prior art measurement-while-drilling logging tools. Additionally, the present invention allows for calibration operations to be conducted before, during, and after logging operations. Preferably, the calibration operations are performed periodically or intermittently during logging operations, and recorded, to be utilized later in explaining any irregularities in the log data. This calibration operation during drilling operations is not found in prior art devices, and is rendered practical by the utilization of digitally-controlled electrical and electronic components in lieu of analog components which are traditionally utilized in logging tools. The logging tool of the present invention also allows for the periodic calculation of the undesirable magnetic field mutual coupling between particular receiving antennas. Once the value of the magnetic mutual coupling is calculated, it may be recorded for future use, or automatically subtracted from particular measurements, greatly enhancing the accuracy of logging operations. Finally, the measurement-while-drilling logging tool of the present invention can perform for the first time accurate borehole calipering operations, due in large part to the great accuracy associated with the particular components selected of the preferred embodiment of the present invention.
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Thompson Larry W.
Wisler Macmillan M.
Baker Hughes Incorporated
O'Shea Sandra L.
Patidar Jay M.
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