Acoustic LWD tool having receiver calibration capabilities
AssigneeHalliburton Energy Services, Inc.
InventorJames W. Stroud
Life of this patent
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Abstract
A sonic or acoustic tool having a transmitter and a receiver and further having a receiver testing and calibration device is disclosed. Methods for testing and tuning acoustic receivers dynamically are also disclosed. The calibration device includes an acoustic signal generator in acoustic communication with a receiver or a plurality of receivers, where the generator generates an acoustic calibration signal or test signal which propagates to each receiver. The receiver response is monitored to determine receiver integrity and tune. Based on the response, the processing unit or units can adjust the receiver response or instruct tuning circuitry associated with the receiver to adjust the receiver response.
Claims20
A down hole tool receiver device comprising:
- (a) a receiver and
- (b) a signal generator in acoustic communication with the receiver for transmitting a calibration signal to the receiver during real-time operation of the device while the device is positioned in a well bore.
A sonic tool comprising:
- (a) an acoustic transmitter;
- (b) a receiver device comprising:
- (i) a receiver and
- (ii) a signal generator in acoustic communication with the receiver for transmitting a calibration signal to the receiver during real-time operation of the device while the device is positioned in a well bore;
- and
- (c) an isolator interposed between the transmitter and the receiver for isolating the transmitter and the receiver.
A method comprising the steps of:
- (a) placing a sonic logging tool in a well wherein the sonic tool comprises:
- (i) an acoustic transmitter;
- (ii) a receiver device comprising:
- (1) a receiver and
- (2) a signal generator in acoustic communication with the receiver for transmitting a calibration signal to the receiver during real-time operation of the device while the device is positioned in a well bore;
- and
- (iii) an isolator interposed between the transmitter and the receiver for isolating the transmitter and the receiver;
- and
- (iv) a signal processing unit in electrical communication with the receiver for analyzing a receiver response to the transmitter or the generator.
Dependencies are inferred from the claim text.