Communications: electrical – Wellbore telemetering or control – In horizontal or inclined passage arrangement
Patent
1985-07-05
1986-12-23
Kyle, Deborah L.
Communications: electrical
Wellbore telemetering or control
In horizontal or inclined passage arrangement
34087016, 417 63, G01L 902
Patent
active
046315357
ABSTRACT:
A device for measuring pressure in a submersible well pump motor has features to eliminate the effect of extraneous DC in the ground path. A potentiometer located downhole has a resistor engaged by a wiper which moves along the resistor in response to pressure change. An upper resistor above the potentiometer resistor connects to the transmission line that leads to the surface. A lower resistor below the wiper travel connects the potentiometer resistor to ground. A first zener diode is connected to the wiper between the wiper and ground. A second zener diode having a greater breakdown voltage, is connected to the transmission line above the upper resistor and to ground. Current is gradually increased at the surface from zero to a maximum level, then repeated. Voltages are measured, with the slopes changing as the zener diodes begin to conduct. The values measured can be used to compute the actual position of the wiper on the potentiometer resistor.
REFERENCES:
patent: 2937527 (1960-05-01), Mason et al.
patent: 3136975 (1964-06-01), Kolb
patent: 3284669 (1966-11-01), Boyd
patent: 3818207 (1974-06-01), Zschimmer
patent: 4157535 (1979-06-01), Balkanli
patent: 4178579 (1979-12-01), McGibbeny et al.
patent: 4216789 (1980-08-01), Hasenbeck
patent: 4477230 (1984-10-01), Knox et al.
Bradley James E.
Hughes Tool Company
Kyle Deborah L.
Parr Ted L.
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