System and method for remote sensing

摘要

A system, method and device may be used to monitor conditions in a borehole. Well tubing and casing act as a conductive pair for delivering power to one or more downhole active sensors. At the surface, power and signal are isolated so that the same conductive pair may act to transmit the sensor signals to the surface. In an embodiment, the sensor signals are RF signals and the surface electronics demodulate the RF signals from the sensor power.

主权项

1. A system for measuring a condition in a downhole environment in a borehole beneath a surface, comprising:
a source, configured and arranged to transmit a power signal via a conductive line in the borehole; a sensor module, in electrical communication with the source via the conductive line, the sensor module comprising an oscillator having a resonant frequency that varies with changes in the condition in the downhole environment, the sensor module being configured and arranged to receive power from the source and to produce a sensor signal in response to the condition in the downhole environment and to transmit the signal, via the conductive line, toward the surface; and a detector, in electrical communication with the sensor module via the conductive line and configured and arranged to receive the sensor signal.