Method and apparatus for correcting a pressure measurement for the influence of temperature
AssigneeSchlumberger Technology Corporation
InventorsMichel V. Berard, Pierre Eisenmann, Yoshinobu Jinzaki, Isabelle M. Dubourg
Life of this patent
Estimating the term…
Abstract
The invention relates to a method of correcting the measurements of a pressure gauge for the influence of temperature transients. In a preferred embodiment, a correction term is added to the pressure value measured at an instant t, the correction term A.sub.O [T(t+.tau.)-T(t)] being proportional to the difference between the temperature T(t+.tau.) measured after a time interval of duration .tau. has elapsed from instant t, and the temperature T(t) at instant t. The invention is applicable to measurements in oil wells.
Claims45
A system for sensing a first pressure under the influence of a temperature and generating a corrected output signal representative of said first pressure corrected for said influence of said temperature, comprising:
- sensing means for sensing said first pressure under said influence of said temperature, said sensing means generating a first output signal representative of said first pressure and a second output signal representative of said temperature;
- and
- correction means responsive to said first output signal and said second output signal from said sensing means for determining a temperature correction in response to said temperature of said second output signal and applying said temperature correction to said first pressure of said first output signal,
- said correction means determining a second pressure representing said first pressure corrected for said influence of said temperature when said temperature correction is applied to said first pressure of said first output signal and generating said corrected output signal representative of said second pressure.
A method of sensing a first pressure under the influence of a temperature and generating a corrected output signal representative of said first pressure corrected for said influence of said temperature, comprising the steps of:
- (a) sensing said first pressure under said influence of said temperature and generating a first output signal representative of said first pressure under said influence of said temperature and generating a second output signal representative of said temperature;
- (b) determining a temperature correction in response to said temperature of said second output signal and applying said temperature correction to said first pressure of said first output signal;
- (c) determining a second pressure representing said first pressure corrected for said influence of said temperature when said temperature correction is applied to said first pressure of said first output signal;
- and
- (d) generating said corrected output signal representing said second pressure in response to the determining step (c).
A system for sensing a first pressure under the influence of a temperature and generating a corrected output signal representative of said first pressure corrected for said influence of said temperature, comprising:
- sensing means for sensing said first pressure under said influence of said temperature, said sensing means generating a first output signal representative of said first pressure and a second output signal representative of said temperature;
- and
- correction means responsive to said first output signal and said second output signal from said sensing means for determining a dynamic temperature correction in response to said temperature of said second output signal and applying said dynamic temperature correction to said first pressure of said first output signal,
- said correction means determining a second pressure representing said first pressure corrected for said influence of said temperature when said dynamic temperature correction is applied to said first pressure of said first output signal and generating said corrected output signal representative of said second pressure.
A method of sensing a first pressure under the influence of a temperature and generating a corrected output signal representative of said first pressure corrected for said influence of said temperature, comprising the steps of:
- (a) sensing said first pressure under said influence of said temperature and generating a first output signal representative of said first pressure under said influence of said temperature and generating a second output signal representative of said temperature;
- (b) determining a dynamic temperature correction in response to said temperature of said second output signal and applying said dynamic temperature correction to said first pressure of said first output signal;
- (c) determining a second pressure representing said first pressure corrected for said influence of said temperature when said dynamic temperature correction is applied to said first pressure of said first output signal;
- and
- (d) generating said corrected output signal representing said second pressure in response to the determining step (c).
Dependencies are inferred from the claim text.