Adaptive filter prediction method and system for detecting drill bit failure and signaling surface operator
First Claim
Patent Images
1. A system for detecting drill bit failure, comprising:
- a drill string having a drill bit and a sub assembly, said sub assembly having no electrical communication with said till bit;
one or more sensors on said sub assembly;
a detection platform on said sub assembly, connected to receive data from said sensors;
wherein said detection platform adaptively models said data.
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Abstract
An apparatus and method for monitoring and reporting downhole bit failure. Sensors are located on a sub assembly (which is removable from the drill bit) and send data to neural net or other adaptive filter. The neural net uses past sensor readings to predict future sensor readings. The value predicted for the sensors is subtracted from the actual value to produce a prediction error. Increases in prediction error are used to indicate bit failure. The results of this are transmitted to the operator by varying the pressure in the drilling mud flow.
155 Citations
30 Claims
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1. A system for detecting drill bit failure, comprising:
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a drill string having a drill bit and a sub assembly, said sub assembly having no electrical communication with said till bit;
one or more sensors on said sub assembly;
a detection platform on said sub assembly, connected to receive data from said sensors;
wherein said detection platform adaptively models said data. - View Dependent Claims (2, 3, 4, 5)
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6. A system for detecting drill bit failure, comprising:
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an adaptive model which fits noise filtered measurements from one or more downhole sensors to within a predetermined tolerance during normal drilling;
wherein bit failure is indicated when said model no longer fits said sensor measurements within said tolerance. - View Dependent Claims (7, 8)
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9. A system for detecting drill bit failure, comprising:
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a drill string having a drill bit and a sub assembly;
one or more sensors located on said sub assembly;
an adaptive filter connected to receive signals from at least one of said sensors;
wherein said adaptive filter predicts future sensor signals based on past sensor signals; and
wherein bit failure is conditionally indicated when an error measurement of said filter exceeds a predetermined threshold. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A system for detecting drill bit failure, comprising:
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an adaptive model which uses past sensor measurements to predict future sensor measurements;
wherein drill bit failure is conditionally indicated when predicted sensor measurements differ from actual sensor measurements in a predetermined way. - View Dependent Claims (16, 17, 18, 19)
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20. A method of predicting failure of a drill bit, comprising the steps of:
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adaptively modeling data from one or more downhole sensors; and
conditionally signalling the surface when the results of said adaptively modeling step deviate significantly from actual sensor measurements, to thereby predict failure of a drill bit. - View Dependent Claims (21)
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22. A method of predicting failure of a drill bit, comprising the steps of:
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adaptively modeling data from sensors in a sub assembly located on a drill string above a drill bit;
said adaptively modeling step having response characteristics which track said data during normal drilling; and
signalling a failing bit state conditionally, when said adaptively modelling step ceases to track said data to within a predetermined goodness-of-fit. - View Dependent Claims (23, 24)
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25. A method of determining drill bit failure, comprising the steps of:
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using part of a time series of downhole sensor data to estimate intermediate elements of said time series, and calculating an error therefrom; and
signalling a failing bit state conditionally in dependence on said error.
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26. A method of determining drill bit failure, comprising the steps of:
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providing a drill string with a sub assembly, said sub assembly located on said string above a drill bit and having one or more sensors which collect data;
providing sensor data to an adaptive filter;
using part of a time series of said sensor data to model other elements of said time series, and calculating a modeling error therefrom; and
signalling a failing bit state conditionally in dependence on said error. - View Dependent Claims (27, 28, 29, 30)
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Specification