System, method and apparatus for petrophysical and geophysical measurements at the drilling bit
First Claim
1. A method for determining at least one characteristic of a downhole formation, the method comprising:
- disposing at least one sensor in a long gauge portion of a long gauge bit;
sampling data from the formation with the at least one sensor at rotation intervals of the long gauge bit;
determining the at least one formation characteristic based, at least in part, on the sampled data; and
wherein the at least one sensor is disposed in at least one insert in a long gauge portion of the long gauge bit.
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Accused Products
Abstract
Measurement of petrophysical and geophysical data of formations in a wellbore using a long gauge bit having at least one sensor therewith. The at least one sensor may be installed in at least one flute of the long gauge bit and/or in the long gauge portion thereof. Data for creating images of the formations are obtained at or near the bottom of the borehole and proximate to the long gauge bit used for drilling the borehole. Orientation of the long gauge bit is also available on a real time basis. Magnetic and/or gravitational sensors may be used in determining bit orientation. The flutes of the long gauge bit and the long gauge portion thereof may have standard inserts to accommodate various types of different sensors and electronic packages therefor.
49 Citations
23 Claims
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1. A method for determining at least one characteristic of a downhole formation, the method comprising:
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disposing at least one sensor in a long gauge portion of a long gauge bit; sampling data from the formation with the at least one sensor at rotation intervals of the long gauge bit; determining the at least one formation characteristic based, at least in part, on the sampled data; and wherein the at least one sensor is disposed in at least one insert in a long gauge portion of the long gauge bit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for determining at least one characteristic of a downhole formation, the method comprising:
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disposing at least two axially spaced sensors on a long gauge bit; taking a first pair of data samples of a formation with the at least two axially spaced sensors at a first time; taking a second pair of data samples of the formation with the at least two axially spaced sensors at a second time; and determining a distance traveled by the long gauge bit by comparing the first and second pairs of data samples; and determining the formation characteristic based, at least in part, on a radial distance traveled by the long gauge bit. - View Dependent Claims (12, 13)
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14. A formation characteristic measurement system, comprising:
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a logging-while-drilling tool for coupling to a drill string; a drive system coupled to the logging-while-drilling tool; a long gauge bit; and at least one sensor disposed in an insert of the long gauge portion of the long gauge bit, the sensor configured to sample data from a formation at rotation intervals of the long gauge bit; a computer comprising at least one processor and a memory, wherein the memory includes executable instruction that cause the at least one processor to determine at least one formation characteristic base, at least in part, on the sampled data. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification