Abstract: The invention relates to a method of measuring pressure in which an evacuated capsule (1) containing a resonant element (5) is placed in the fluid whose pressure is to be measured, a vibration characteristic of the element is measured, and the pressure is deduced from said characteristic. A resonant element is used which, during measurement, is to be found in a stress state that is close to buckling. For this purpose, it is possible to use heater means for heating the element and servo-controlled so as to keep the frequency of vibration thereof constant. The resonant element can be made of silicon. The invention is particularly applicable to oil wells.
Type:
Grant
Filed:
January 22, 2002
Date of Patent:
September 9, 2003
Assignee:
Schlumberger Technology Corporation
Inventors:
Eric Donzier, Fadhel Rezgui, Alfred Permuy