Bit based formation evaluation using a gamma ray sensor
First Claim
Patent Images
1. A drill bit, comprising:
- a bit body including a cone having a cutter and a shank having a neck section; and
a gamma ray sensor that is one of embedded in the cone and within a shank of the bit body outside the neck section, the gamma ray sensor configured to detect naturally occurring gamma rays from a formation being drilled.
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Abstract
A drill bit made according to one embodiment includes at least a gamma ray sensor configured to provide signals representative of a presence and/or amount of a naturally occurring gamma ray source when the drill bit is used for cutting into a formation. A circuit may be configured to process signals from the gamma ray sensor to provide an estimate a parameter relating to the naturally occurring gamma ray source, which may used for purposes such as optimizing drilling parameters and geosteering.
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Citations
19 Claims
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1. A drill bit, comprising:
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a bit body including a cone having a cutter and a shank having a neck section; and a gamma ray sensor that is one of embedded in the cone and within a shank of the bit body outside the neck section, the gamma ray sensor configured to detect naturally occurring gamma rays from a formation being drilled. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of making a drill bit, comprising:
embedding in a bit body of the drill bit a gamma ray sensor configured to provide signals representative of a naturally occurring gamma ray source in a formation being drilled, wherein the bit body includes a cone having a cutter and a shank having a neck section, and wherein the gamma ray sensor is one of embedded in the cone and within the shank of the bit body outside the neck section. - View Dependent Claims (8)
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9. A drilling system for use in drilling a wellbore in an earth formation, comprising:
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a drill string; a drill bit having a bit body positioned at an end of the drill string, wherein the bit body includes a cone having a cutter and a shank having a neck section; a gamma ray sensor that is one of integrated in the cone and within the shank of the bit body outside the neck section, the gamma ray sensor configured to provide signals representative of one or more naturally occurring gamma ray sources in a formation being drilled; and a processor configured to receive data from the gamma ray sensor and estimate a desired parameter of interest relating to the formation being drilled. - View Dependent Claims (10, 11, 12)
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13. A method for drilling a wellbore in an earth formation, comprising:
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drilling the wellbore with a drill bit having a gamma ray sensor embedded in a bit body, wherein the bit body includes a cone having a cutter and a shank having a neck section, and wherein the gamma ray sensor is one of embedded in the cone and within the shank of the bit body outside the neck section; and detecting one or more naturally occurring gamma ray sources in a formation being drilled using the gamma ray sensor. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification