Leadless sub assembly for downhole detection system
First Claim
Patent Images
1. A system for monitoring drill bit performance, comprising:
- a drill string mechanically connecting a drill bit to the surface; and
a sub assembly on the lower end of said string above said drill bit;
wherein said sub assembly includes one or more sensors, and circuitry which processes the output of said one or more sensors to detect and signal failing of the drill bit, without relying on sensors in the drill bit.
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Abstract
A drill string is equipped with a down hole sub assembly which contains sensors to detect equipment condition during drilling. The sub assembly has no electrical communication with the drill bit itself, and the sensors detect drill bit condition from vibrations or strain or other detectable phenomena. Sensors in the bit itself are not needed.
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Citations
19 Claims
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1. A system for monitoring drill bit performance, comprising:
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a drill string mechanically connecting a drill bit to the surface; and
a sub assembly on the lower end of said string above said drill bit;
wherein said sub assembly includes one or more sensors, and circuitry which processes the output of said one or more sensors to detect and signal failing of the drill bit, without relying on sensors in the drill bit. - View Dependent Claims (2, 3, 4, 5)
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6. A system for monitoring drill bit performance, comprising:
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a drill string mechanically connecting a drill bit to the surface;
a sub assembly on the lower end of said string above said drill bit;
a detection platform on said sub assembly which receives data from one or more sensors;
wherein said sub assembly is connected to predict and signal failure of the drill bit, without any connection to sensors in the drill bit. - View Dependent Claims (7, 8, 9, 10)
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11. A method of operating a drill rig, comprising the steps of:
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monitoring a signal transmitted from a downhole instrumented sub assembly, said sub assembly having no electrical communication with sensors in an attached drill bit, and said sub assembly having at least one sensor thereon;
halting drilling when said signal indicates an impending failure condition. - View Dependent Claims (12, 13, 14, 15)
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16. A method of operating a drill rig, comprising the steps of:
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on a drill string having a drill bit, monitoring a signal transmitted from one or more downhole sensors, said sensors located on a sub assembly which has no electrical communication with sensors in said drill bit;
taking a predetermined action when said signal indicates a change in downhole equipment conditions. - View Dependent Claims (17, 18, 19)
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Specification