Measuring and testing – Borehole or drilling – Downhole test
Patent
1988-09-06
1990-05-15
Woodiel, Donald O.
Measuring and testing
Borehole or drilling
Downhole test
73706, 73722, 73753, 361283, E21B 4700, G01L 912
Patent
active
049247018
ABSTRACT:
A pressure measurement system comprising a capacitance device whose outer interrelated capacitance plates are maintained in a relatively fixed position relative to one another while an intermediate capacitance plate responds to temperature. The plates are in a restricted enclosure containing a gas dielectric medium. The pressure of the gas dielectric medium (and consequently the density of the gas) is controlled as a function of a pressure to be measured. By measurement of capacitance relationships as a function of the temperature and density of the gas dielectric medium, a pressure measurement is obtained. The system is constructed with like types of materials where the capacitance device is in an enclosure chamber which is immersed in a pressure media. The capacitance device is constructed with a symmetrical arrangement to balance out effects of gravity or vibration. Construction of micro components utilizes an electrostatic bonding system which eliminated arcing during bonding.
REFERENCES:
patent: 3478589 (1969-11-01), Birken
patent: 3911902 (1975-10-01), Delpy
patent: 4545254 (1985-10-01), Lawless et al.
Panex Corporation
Woodiel Donald O.
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