Patent US5307681A successfully refreshed from Google Patents.
US5307681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transient temperature compensation for pressure gauges using discrete temperature history measurements for gauge calibration
Assignee: Marathon Oil Co
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Filing: 1992-08-05
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Granted: 1994-05-03
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Expires: 2012-08-05
Abstract
Abstract Disclosed is a system wherein the compensation for temperature effects on a pressure measurement gauge are accomplished by processing the raw pressure measurement signal from the gauge through an equation to produce a thermally compensated measurement. The equation expresses the thermally compensated pressure determination as a relation between a derivative of temperature and temperature. When the gauge is placed in an oil or gas well, the equation is used to obtain a correction for the measured pressure from the temperature measured adjacent to the pressure gauge.
Inventors
- 👤 Eric B. Phelps
- 👤 Gary R. Cook
- 👤 Wayne O. Roszelle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:20
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/06; G; G01; G01L; G01L9/00; G01L9/08; G01L9/085
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
151 words
A method for thermally compensating the pressure value displayed by a pressure gauge, said method comprising the steps of: (a) inputting, into a computer system, an equation which expresses a thermally compensated pressure value as a relation between a derivative of temperature and temperature comprising using ##EQU3## as said equation wherein p e represents pressure error, T represents temperature, t represents time, each a i is a function of temperature and each b j is a function of temperature; (b) measuring the pressure of the surroundings of which a pressure value is desired with said pressure gauge; (c) measuring the temperature of the immediate environment of said pressure gauge; (d) inputting said temperature measurement and said pressure measurement into said computer system containing said equation; (e) computing said pressure value using said temperature measurement, said pressure measurement and said equation; (f) displaying said thermally compensated pressure value on a display device.
Claim 2
Independent Claim
151 words
A method for thermally compensating the pressure value displayed by a pressure gauge, said method comprising the steps of: (a) inputting, into a computer system, an equation which expresses a thermally compensated pressure value as a relation between a derivative of temperature and temperature comprising using ##EQU3## as said equation wherein p e represents pressure error, T represents temperature, t represents time, each a i is a function of temperature and each b j is a function of temperature; (b) measuring the pressure of the surroundings of which a pressure value is desired with said pressure gauge; (c) measuring the temperature of the immediate environment of said pressure gauge; (d) inputting said temperature measurement and said pressure measurement into said computer system containing said equation; (e) computing said pressure value using said temperature measurement, said pressure measurement and said equation; (f) displaying said thermally compensated pressure value on a display device.
Claim 3
Dependent Claim
37 words
The method of claim 1 further comprising the steps of: (g) repeating steps (b) through (e) over a period of time; and (h) plotting said thermally compensated pressure value with respect to time on a plotting device.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein said temperature measurement is performed using a thermal sensor in close proximity to said gauge.
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein said gauge is a quartz pressure gauge.
Claim 6
Dependent Claim
20 words
The method of claim 1 wherein said surroundings of which a thermally compensated pressure value is desired is a borehole.
Claim 7
Dependent Claim
41 words
The method of claim 5 further comprising the steps of: (g) transmitting said thermally compensated pressure value to a control system; and (h) controlling flow from said borehole using said control system to limit changes in said thermally compensated pressure value.
Claim 8
Dependent Claim
61 words
The method of claim 5 further comprising the steps of: (g) transmitting said thermally compensated pressure value to a control system; (h) connecting said control system to fluid control valves connected to at lest one adjacent borehole; and (i) controlling flow of fluid into said at least one adjacent borehole using said control system to limit said thermally compensated pressure value.
Claim 9
Independent Claim
205 words
A method for thermal compensation of the pressure value made by a pressure gauge within a borehole, said method comprising the steps of: (a) inputting, into a computer system, an equation which expresses a thermally compensated pressure value as a relation between a derivative of temperature and temperature comprising using ##EQU4## as said equation wherein p e represents pressure error, T represents temperature, t represents time, each a i is a function of temperature and each b j is a function of temperature; (b) placing said pressure gauge in said borehole; (c) measuring the pressure within said borehole with said pressure gauge; (d) measuring the temperature of the immediate area of said borehole surrounding said pressure gauge; (e) inputting said temperature measurement and said pressure measurement into said computer system containing said equation; (f) computing said thermally compensated pressure value using said temperature measurement, said pressure measurement and said equation; (g) transmitting said thermally compensated pressure value and said pressure error to a control system; (h) connecting said control system to fluid control valves connected to at least one adjacent borehole; and (i) controlling flow of fluid into said at least one adjacent borehole using said control system to limit said thermally compensated pressure value.
Claim 10
Independent Claim
205 words
A method for thermal compensation of the pressure value made by a pressure gauge within a borehole, said method comprising the steps of: (a) inputting, into a computer system, an equation which expresses a thermally compensated pressure value as a relation between a derivative of temperature and temperature comprising using ##EQU4## as said equation wherein p e represents pressure error, T represents temperature, t represents time, each a i is a function of temperature and each b j is a function of temperature; (b) placing said pressure gauge in said borehole; (c) measuring the pressure within said borehole with said pressure gauge; (d) measuring the temperature of the immediate area of said borehole surrounding said pressure gauge; (e) inputting said temperature measurement and said pressure measurement into said computer system containing said equation; (f) computing said thermally compensated pressure value using said temperature measurement, said pressure measurement and said equation; (g) transmitting said thermally compensated pressure value and said pressure error to a control system; (h) connecting said control system to fluid control valves connected to at least one adjacent borehole; and (i) controlling flow of fluid into said at least one adjacent borehole using said control system to limit said thermally compensated pressure value.
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| 3.5 Years (Year 4) | 1997-05-02 | 1997-11-01 | 1998-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-02 | 2001-11-01 | 2002-05-03 | $3760.00 | Window Closed / Lapsed |
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