METHOD AND DEVICE FOR REMOTE MEASURING OF PRESSURE AND TEMPERATURE IN WELL BY SINGLE SENSOR Russian patent published in 1997 - IPC

FIELD: oil production and other industries. SUBSTANCE: according to method, electric current from bipolar source is fed to double-arm strain-gauge transducer and measured are voltage values and according to them determined are temperature and pressure using mathematical expressions with counting of coefficients of proportions of these parameters. Outputs of current source are connected by three-wire communication line with three inputs of analogue-digital converter and its output is connected to microprocessor unit. At feeding positive current pulse, measured is voltage between first (upper) wire of communication line which feeds arm of strain-gauge transducer and middle potential wire and between third (lower) wire of communication line and potential middle wire, and when negative pulse is fed to arm of strain-gauge transducer, measured is voltage between potential third wire or lower wire and feeding middle wire. EFFECT: high efficiency. 2 cl, 2 dwg