Transient temperature compensation for pressure gauges

A method for thermal compensation of the pressure value displayed by a pressure gauge, said method comprising the steps of:

• (a) determining the coefficient values to a linear differential equation which expresses a thermally compensated pressure value as a relation between a derivative of temperature and a derivative of pressure error comprising using ##EQU7## as said linear differential equation wherein p.sub.e represents pressure error, T represents temperature, t represents time, and each q.sub.i 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 pressure measurement and said temperature measurement into a computer system containing said linear differential equation;
• (e) computing a thermally compensated pressure value using said pressure measurement, said temperature measurement, and said linear differential equation;
• and
• (f) displaying said thermally compensated pressure value on a display device.

A method for thermal compensation of the pressure value made by a pressure gauge within a borehole, said method comprising the steps of:

• (a) determining the coefficient values to a linear differential equation which expresses a thermally compensated pressure value as a relation between a derivative of temperature and a derivative of pressure error comprising using ##EQU9## as said linear differential equation wherein p.sub.e represents pressure error, T represents temperature, t represents time, and each q.sub.i 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 pressure measurement and said temperature measurement into a computer system containing said linear differential equation;
• (f) computing said thermally compensated pressure value using said pressure measurement, said temperature measurement, and said linear differential equation;
• (g) transmitting said thermally compensated pressure value 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.