Pressure sensor useable in oil wells

Details Pressure sensor useable in oil wells Pressure sensor useable in oil wells

1989-10-27

1991-06-18

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Diaphragm

73751, 73706, 73727, G01L 906

Patent

active

050240986

ABSTRACT:
A pressure sensor of the present invention can perform pressure measurements under very severe mechanical and thermal conditions. It comprises a cell carrying a strain-measuring circuit. The cell is placed inside a body and is put into contact with the pressure to be measured. The cell has a hermetically sealed internal chamber inside which pressure is set to a predetermined reference value. The outside surface of the cell is subjected to the pressure to be measured. The cell is constituted by two half-shells joined together according to a join plane. The cell is preferably made of sapphire, with the crystal axis of the sapphire being perpendicular to the join plane so as to obtain isotropic stresses. A strain-gauge circuit is deposited on a plane surface of one of the half-shells, parallel to the join plane. The sensor is particularly suitable for testing oil deposits.

REFERENCES:
patent: 4084438 (1978-04-01), Lee et al.
patent: 4576049 (1986-03-01), Kohnlechner
patent: 4586108 (1986-04-01), Frick
patent: 4622855 (1986-11-01), Sinha et al.
patent: 4644797 (1987-02-01), Ichikawa et al.
patent: 4800758 (1989-01-01), Knecht et al.

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