TRANSIENT TEMPERATURE COMPENSATION FOR PRESSURE GAUGES

摘要

Disclosed is a system wherein the compensation for temperature effects on a pressure measurement gauge is accomplished by processing the raw pressure measurement signal from the gauge through a linear differential equation to produce a thermally compensated measurement. The linear differential equation expresses the thermally compensated pressure determination as a relation between a derivative of temperature and a derivative of pressure error. The linear differential equation contains several coefficients having constant values, and these constant values are computed by calibrating the pressure gauge in a pressure tank having a known pressure and temperature. When the gauge is later placed in an oil or gas well, the coefficient values are used to obtain the corrected measured pressure from the raw measured pressure received from the gauge.