Method to improve downhole instruments
First Claim
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1. An apparatus configured to evaluate an earth formation, the apparatus comprising:
- at least one sensor conveyed on a tool in a borehole, the at least one sensor configured to provide an associated signal indicative of a property of the formation;
at least one additional sensor ahead of the at least one sensor on the tool configured to make a measurement of the same property of the earth formation as is measured by the at least one sensor and provide an output responsive thereto; and
circuitry configured to use the output of the at least one additional sensor to control an acquisition parameter of the signal from the at least one sensor.
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Abstract
Measurements are made using a plurality of measure electrodes on a pad of a logging tool. The bias and gain of the measurements prior to A/D conversion are altered using measurements made by an additional electrode that is ahead of the measure electrodes.
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Citations
19 Claims
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1. An apparatus configured to evaluate an earth formation, the apparatus comprising:
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at least one sensor conveyed on a tool in a borehole, the at least one sensor configured to provide an associated signal indicative of a property of the formation; at least one additional sensor ahead of the at least one sensor on the tool configured to make a measurement of the same property of the earth formation as is measured by the at least one sensor and provide an output responsive thereto; and circuitry configured to use the output of the at least one additional sensor to control an acquisition parameter of the signal from the at least one sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of evaluating an earth formation, the method comprising:
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making a measurement with at least one sensor conveyed on a tool in a borehole, the measurement being indicative of a property of the formation; making at least one additional measurement of the property using at least one additional sensor ahead of the at least one sensor on the tool; and using the at least one additional measurement for controlling an acquisition parameter of the at least one sensor used in making the measurement. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A computer readable medium product having stored thereon instructions that when read by a processor cause the processor to execute a method, the method comprising:
controlling an acquisition parameter of a measurement of a property of an earth formation made by at least one sensor on a tool using a measurement of the same property made by at least one additional sensor ahead of the at least one sensor on the tool. - View Dependent Claims (19)
Specification