G - Physics – 01 – L
Patent
G - Physics
01
L
G01L 9/00 (2006.01)
Patent
CA 2368766
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.
L'invention porte sur un procédé de mesure de pression dans lequel une capsule (1) sous vide, contenant un élément (5) résonant, est placée dans le fluide dont la pression doit être mesurée. Selon ce procédé, on mesure une caractéristique de vibration de l'élément et on déduit de cette caractéristique la pression. L'élément résonnant utilisé, au cours de la mesure, s'avère être dans un état de contrainte proche du flambage. Il est alors possible d'utiliser un organe chauffant pour chauffer l'élément, cet organe étant servocommandé de façon à maintenir constante la fréquence de vibration. L'élément résonant peut être en silicium. Cette application peut s'appliquer notamment au domaine de l'exploration pétrolière.
Donzier Eric
Permuy Alfred
Rezgui Fadhel
Schlumberger Canada Limited
Smart & Biggar
LandOfFree
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