Monitoring of wells to detect the composition of matter in boreholes and propped fractures
First Claim
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1. A system comprising:
- a processor;
a plurality of resonant tags, wherein each resonant tag further comprises;
a cylindrical array comprising a plurality of structures arranged to form a second hollow cylinder;
a dielectric material configured to fill the second hollow cylinder; and
a covering material configured to encapsulate the filled cylindrical array such that the resonant tag has a size approximating the size of a proppant; and
an interrogator configured to interrogate a channel associated with an oil well borehole using a frequency-modulated radio frequency (RF) signal such that the frequency-modulated RF signal covers an expected range of resonant frequencies for the resonant tags within the channel, and wherein the processor is configured to characterize a dielectric constant for a medium in the channel using resonant reflections received by the interrogator from the resonant tags in the channel.
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Abstract
There is provided a system and method for monitoring of fractured wells and conventional wells to detect leaks. The method comprises interrogating a plurality of resonant tags using a modulated RF signal transmitted from an interrogator, wherein the plurality of resonant tags are dispersed within a channel.
45 Citations
13 Claims
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1. A system comprising:
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a processor; a plurality of resonant tags, wherein each resonant tag further comprises; a cylindrical array comprising a plurality of structures arranged to form a second hollow cylinder; a dielectric material configured to fill the second hollow cylinder; and a covering material configured to encapsulate the filled cylindrical array such that the resonant tag has a size approximating the size of a proppant; and an interrogator configured to interrogate a channel associated with an oil well borehole using a frequency-modulated radio frequency (RF) signal such that the frequency-modulated RF signal covers an expected range of resonant frequencies for the resonant tags within the channel, and wherein the processor is configured to characterize a dielectric constant for a medium in the channel using resonant reflections received by the interrogator from the resonant tags in the channel. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method comprising:
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interrogating a channel using a frequency-modulated radio frequency (RF) signal transmitted from an interrogator such that the frequency-modulated RF signal covers an expected range of resonant frequencies for interrogated resonant tags within the channel, wherein each resonant tag comprises; a cylindrical array comprising a plurality of structures arranged to form a second hollow cylinder; a dielectric material configured to fill the second hollow cylinder; and a covering material configured to encapsulate the filled cylindrical array such that the resonant tag has a size approximating the size of a proppant; determining a strength for reflected resonant signals from the interrogated resonant tags; and characterizing a dielectric constant for a material filling the channel using the determined signal strengths. - View Dependent Claims (8, 9)
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10. A method, comprising:
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advancing an interrogator through an oil well borehole to sampled locations within the borehole, wherein the borehole includes a well casing having a plurality of resonant tags lining a borehole-facing wall for the well casing, wherein each resonant tag further comprises; a cylindrical array comprising a plurality of structures arranged to form a second hollow cylinder; a dielectric material configured to fill the second hollow cylinder; and a covering material configured to encapsulate the filled cylindrical array such that the resonant tag has a size approximating the size of a proppant; at each sampled location, interrogating resonant tags at the sampled location to characterize a dielectric constant for a channel between the interrogator and the interrogated resonant tags at the sampled location; and based upon the characterized dielectric constants for the channels at the sampled locations, determining whether the well casing is compromised. - View Dependent Claims (11, 12, 13)
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Specification