Measuring and testing – Fluid pressure gauge – With pressure and/or temperature compensation
Patent
1984-11-01
1986-08-26
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
With pressure and/or temperature compensation
364558, 364571, 364578, G01L 1904
Patent
active
046075305
ABSTRACT:
Methods and apparatus are provided for thermally compensating pressure determinations of pressure gauges through the use of a fast responding thermal device which is attached to the gauge and a dynamic model of the pressure gauge resonator which assumes that the temperature is not uniform throughout the resonator when temperature transients are present. The pressure gauge is subjected to known temperature and pressure conditions so that the parameters of a dynamic thermal model of the resonator may be determined, as well as a frequency and temperature to pressure mapping. The gauge may then be used to make measurements and provides a frequency output. The thermal device provides temperature readings. The temperature readings are input into a dynamic system using the dynamic thermal model to provide a correction to the frequency output of the pressure gauge such that the corrected frequency may be input into the frequency and temperature to pressure mapping to provide the thermally corrected pressure reading. Different embodiments of the invention include a single gauge in an open-loop configuration, two gauges in an open-loop configuration which is especially useful in the borehole environment, a single gauge in a closed-loop configuration, and two gauges in a dynamic system switching configuration.
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Gordon David P.
Schlumberger Technology Corporation
Woodiel Donald O.
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