Multi-Coil RFID Sensor Assembly
First Claim
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1. A method of making measurements in a borehole, comprising:
- providing a communication assembly in the borehole, wherein the communication assembly is configured to communicate with radio frequency identification device (RFID) tags in the borehole;
wherein the communication assembly includes a sensor assembly comprising at least one sensor having at least two sensor coils;
pumping a fluid into the borehole, the fluid containing a plurality of RFID tags; and
interrogating the plurality of RFID tags with the communication assembly to determine the presence or absence of RFID tags within the borehole.
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Accused Products
Abstract
A communication assembly including at least one sensor assembly made up of interrogation circuitry and one or more antennae is described. The interrogation circuitry comprises at least one inductor comprising at least two sensing coils for reception of signals from the MEMS data sensors.
17 Citations
25 Claims
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1. A method of making measurements in a borehole, comprising:
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providing a communication assembly in the borehole, wherein the communication assembly is configured to communicate with radio frequency identification device (RFID) tags in the borehole; wherein the communication assembly includes a sensor assembly comprising at least one sensor having at least two sensor coils; pumping a fluid into the borehole, the fluid containing a plurality of RFID tags; and interrogating the plurality of RFID tags with the communication assembly to determine the presence or absence of RFID tags within the borehole. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A communication assembly for use in a borehole with a borehole wall and a casing string, comprising:
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an assembly associated with an annulus formed between the borehole wall and the casing string, the assembly comprising; an RFID sensing assembly configured to communicate interrogation signals to an RFID tag within the annulus and to receive signals from the RFID tag, the RFID sensing assembly including; an antenna arranged around the circumference of the communication assembly and configured to communicate with the RFID tag in the annulus; and at least one sensor comprising at least two sensor coils; a data storage device to receive information associated with signals received from the RFID tag; and a power source configured to supply electrical power to the electronic control circuitry and the data storage device. - View Dependent Claims (11, 12, 13, 14, 15, 16, 18, 21)
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17. (canceled)
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19. (canceled)
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20. (canceled)
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22. (canceled)
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23. A system for use in a borehole, comprising:
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a casing string comprising first and second communication assemblies supported by the casing string and disposed in longitudinally spaced relation to one another along the casing string, RFID tags located in a fluid in an annulus surrounding the casing string when the casing string is in place within the borehole, a control unit configured to receive data indicative of the information received from the first and second communication assemblies to provide information about the fluid in the annulus; and wherein each communication assembly is configured to obtain information associated with RFID tags in an annulus surrounding the casing when the casing is in place within a borehole; and wherein each communication assembly comprises a sensor assembly comprising at least one sensor comprising at least two sensor coils. - View Dependent Claims (24)
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25-33. -33. (canceled)
Specification