Apparatus and method for monitoring acoustic energy in a borehole
First Claim
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1. A system for monitoring acoustic waves in a subsurface borehole, comprising:
- a signal generator, constructed and arranged to produce an electromagnetic signal;
a transmission line extendable along the borehole for transmitting the electromagnetic signal;
a sensor including a resonant circuit and positionable in the borehole for receiving the transmitted electromagnetic signal, the resonant circuit having a resonant frequency that is variable in response to received acoustic energy, such that, in operation, the resonant circuit modulates the transmitted electromagnetic signal in accordance with the variation in the resonant frequency and returns the modulated signal along the transmission line; and
a receiver, constructed and arranged to receive the modulated signal.
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Abstract
A system, method and device may be used to monitor acoustic energy in a borehole. Electromagnetic energy is used to energize a resonant circuit incorporating a sensor. The sensor modulates the electromagnetic energy in accordance with received acoustic energy and transmits the modulated energy so that it may be received and processed in order to obtain the desired measurements.
69 Citations
20 Claims
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1. A system for monitoring acoustic waves in a subsurface borehole, comprising:
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a signal generator, constructed and arranged to produce an electromagnetic signal; a transmission line extendable along the borehole for transmitting the electromagnetic signal; a sensor including a resonant circuit and positionable in the borehole for receiving the transmitted electromagnetic signal, the resonant circuit having a resonant frequency that is variable in response to received acoustic energy, such that, in operation, the resonant circuit modulates the transmitted electromagnetic signal in accordance with the variation in the resonant frequency and returns the modulated signal along the transmission line; and a receiver, constructed and arranged to receive the modulated signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of monitoring acoustic waves in a subsurface borehole, comprising:
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generating an electromagnetic signal; transmitting the electromagnetic signal to a region of interest in the subsurface borehole; receiving acoustic energy with a sensor positioned in the region of interest; modulating, with the sensor, the electromagnetic signal in response to the received acoustic energy; and returning the modulated electromagnetic signal. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification