Reservoir management system and method
A remote sensing unit for sensing subsurface formation is provided. The remote sensing unit is an active device with the capability of responding to control commands to determine subsurface formation characteristics, and transmitting corresponding data values. Some embodiments of the remote sensing unit include a battery, or a capacitor for storing charge. The embodiments that include the capacitor receive RF power that is converted to a DC signal for storing charge on the capacitor. When the charge is depleted to a specified point, the remote sensing unit prompts the wellbore tool to transmit additional RF power to recharge the capacitor. The remote sensing unit is provided with RF power to wake it up and to place it into an operational mode, and/or to send modulated data values that are then transmitted to the surface where operational decisions for the well may be made.
1. A remote sensing unit for sampling a subsurface formation to obtain formation data, comprising:
a fluid port for fluidly communicating with a subsurface formation material;
data acquisition circuitry fluidly coupled to the fluid port for sampling the subsurface formation material to determine subsurface formation data; and
a transceiver coupled to the fluid port for transmitting the subsurface formation data.
2. The remote sensing unit of claim 1 wherein the data acquisition circuitry comprises a pressure sensor for determining subsurface formation pressure.
3. The remote sensing unit of claim 1 wherein the data acquisition circuitry comprises a resistivity sensor for determining the subsurface formation material resistivity.
4. The remote sensing unit of claim 1 wherein the data acquisition circuitry comprises a temperature sensor.
5. The remote sensing unit of claim 1 further comprising a power supply.
6. The remote sensing unit of claim 1 further comprising a battery.
7. The remote sensing unit of claim 1 further comprising a charge storage device.
8. The remote sensing unit of claim 1 further comprising modulation circuitry for modulating subsurface formation data.
9. The remote sensing unit of claim 8 further comprising demodulation circuitry for demodulating control commands received from an external wireless transceiver.
10. The remote sensing unit of claim 1 wherein the data acquisition circuitry comprises a pressure sensor for determining subsurface formation pressure, a resistivity sensor for determining the subsurface formation material resistivity, and a temperature sensor.
11. A remote sensing unit for sampling a subsurface formation to obtain subsurface formation data, comprising:
a fluid port for fluidly communicating with a subsurface formation material;
data acquisition circuitry fluidly coupled to the fluid port for sampling the subsurface formation material to determine subsurface formation data, the data acquisition circuitry comprising a pressure sensor and a temperature sensor;
a transceiver coupled to the fluid port for transmitting the subsurface formation data;
a power supply having a charge storage device for converting RF power received by the transceiver to a DC signal and for charging the charge storage device with the converted DC signal;
modulation circuitry for modulating the subsurface formation data to be transmitted to the downhole power and communication signal transceiver system; and
demodulation circuitry for demodulating control commands transmitted by the downhole power and communication signal transceiver system.
12. The remote sensing unit of claim 11 further comprising a subsurface formation resistivity sensor.
13. The remote sensing unit of claim 11 further comprising a battery for providing power for the remote sensing unit to sample a subsurface fomation and for transmitting subsurface formation data.
14. The remote sensing unit of claim 13 , further including a casing formed of a metal portion and of a non-metal portion for allowing electromagnetic signals to be received and transmitted by the transceiver.
15. A remote sensing unit for sampling a subsurface formation to obtain subsurface formation data, comprising:
a fluid port for fluidly communicating with a subsurface formation material;
data acquisition circuitry fluidly coupled to the fluid port for sampling the subsurface formation material to determine subsurface formation data;
a transceiver coupled to the fluid port for tranamitting the subsurface formation data;
a charge storage device; and
a power supply coupled to the charge storage device for receiving RF power from a wireless communication link and for charging the charge storage device.
16. The remote sensing unit of claim 15 further comprising modulation and demodulation circuitry for modulating and demodulating communication signals transceived over a wireless communication link.
17. The remote sensing unit of claim 16 further including a temperature sensor.
18. The remote sensing unit of claim 16 further including a pressure sensor.