Communications: electrical – Wellbore telemetering or control
Patent
1994-08-03
1996-01-09
Eldred, J. Woodrow
Communications: electrical
Wellbore telemetering or control
3408532, 324543, 324601, 324691, G01V 100
Patent
active
054832322
ABSTRACT:
A method and apparatus for predicting the peak voltage at the load end of a power transmission cable having a power supply end and a load end, where direct measurement at the load end is not practical. The method samples the current and voltage waveforms at the power supply end of the cable. The current waveform is used to estimate a current function which includes a full width at half maximum approximation adjusted as required for load, cable type, and cable length. The product of the current function and a peak voltage sample from the power supply end is an estimate of the peak voltage at the load end. The method and apparatus have been applied to oil well logging where one or more logging tools are lowered at the end of a transmission cable into an oil well and it is desirable to predict peak voltage at the tools to ensure proper tool performance.
REFERENCES:
patent: 5150064 (1992-09-01), Nozick
patent: 5309294 (1994-05-01), Cahalan
patent: 5359711 (1994-10-01), Hartmann et al.
Clark, Jr. Lloyd D.
Mayhugh Terry L.
Mayhugh, Jr. Terry L.
Neeley Jimmy E.
Vachon Guy
Eldred J. Woodrow
Huston Charles D.
Schlumberger Technology Corporation
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