Temperature compensated strain measurement

Details Temperature compensated strain measurement Temperature compensated strain measurement

2007-02-06

2007-02-06

Williams, Hezron (Department: 2856)

Measuring and testing

Borehole or drilling

Downhole test

C073S152480, C073S152490

Reexamination Certificate

active

11023848

ABSTRACT:
The present invention provides methods and apparatus for measuring subterranean strain. The methods and apparatus use fluid expansion principles to compensate for temperature variations and increase the accuracy of the strain measurements. The methods and apparatus contemplate the use of multiple fluid chambers according to some embodiments in order to remove temperature dependence from stress or strain measurements.

REFERENCES:
patent: 3635076 (1972-01-01), Sacks et al.
patent: 4543832 (1985-10-01), Van Over
patent: 5739435 (1998-04-01), Sacks et al.
patent: 5900545 (1999-05-01), Sacks et al.
patent: 335564 (1959-01-01), None
patent: 1 201 055 (1970-08-01), None
patent: 57-165710 (1983-01-01), None
patent: WO 1997/15804 (1997-05-01), None

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