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US3714822A
Expired / Lapsed
US
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Process for measuring wear on a drilling tool
Assignee: PETROLES D AQUITAIRE SOC NAT D
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Filing: 1970-11-09
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Granted: 1973-02-06
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Expires: 1990-11-09
Abstract
Abstract The wear on a drilling tool is measured by picking up certain vibrations produced by rotating said tool, which vibrations have a component indicative of the extent to which the tool has worn. The indicative component may be at least partially isolated so as to produce a more exact result.
Inventors
- 👤 J Lutz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:03
CPC Classifications
E; E21; E21B; E21B12/00; E21B12/02; E21B44/00; G; G01; G01N; G01N3/00; G01N3/58
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
128 words
A process for measuring the amount of wear which has occurred on a drilling tool rotating at a given frequency of rotation, which process comprises the steps of: A. detecting naturally occurring vibrations of said tool during a drilling operation, B. generating an electrical signal having frequencies representative of the frequencies of the detected vibrations, C. selecting a first limited frequency band bracketing one of the first two harmonics of the frequency of maximum amplitude thus generated, D. selecting a second limited frequency band in a trough between two harmonics and adjacent the second harmonic of the frequency of maximum amplitude, and E. comparing the average amplitude of said selected frequency bands to derive from the ratio between said average amplitudes an indication of said amount of wear.
Claim 2
Dependent Claim
128 words
A process for measuring the amount of wear which has occurred on a drilling tool rotating at a given frequency of rotation, which process comprises the steps of: A. detecting naturally occurring vibrations of said tool during a drilling operation, B. generating an electrical signal having frequencies representative of the frequencies of the detected vibrations, C. selecting a first limited frequency band bracketing one of the first two harmonics of the frequency of maximum amplitude thus generated, D. selecting a second limited frequency band in a trough between two harmonics and adjacent the second harmonic of the frequency of maximum amplitude, and E. comparing the average amplitude of said selected frequency bands to derive from the ratio between said average amplitudes an indication of said amount of wear.
Claim 3
Dependent Claim
128 words
A process for measuring the amount of wear which has occurred on a drilling tool rotating at a given frequency of rotation, which process comprises the steps of: A. detecting naturally occurring vibrations of said tool during a drilling operation, B. generating an electrical signal having frequencies representative of the frequencies of the detected vibrations, C. selecting a first limited frequency band bracketing one of the first two harmonics of the frequency of maximum amplitude thus generated, D. selecting a second limited frequency band in a trough between two harmonics and adjacent the second harmonic of the frequency of maximum amplitude, and E. comparing the average amplitude of said selected frequency bands to derive from the ratio between said average amplitudes an indication of said amount of wear.
Claim 4
Dependent Claim
128 words
A process for measuring the amount of wear which has occurred on a drilling tool rotating at a given frequency of rotation, which process comprises the steps of: A. detecting naturally occurring vibrations of said tool during a drilling operation, B. generating an electrical signal having frequencies representative of the frequencies of the detected vibrations, C. selecting a first limited frequency band bracketing one of the first two harmonics of the frequency of maximum amplitude thus generated, D. selecting a second limited frequency band in a trough between two harmonics and adjacent the second harmonic of the frequency of maximum amplitude, and E. comparing the average amplitude of said selected frequency bands to derive from the ratio between said average amplitudes an indication of said amount of wear.
Claim 5
Dependent Claim
24 words
A process as claimed in claim 1 in which said first limited frequency band brackets the first harmonic of said frequency of maximum amplitude.
Claim 6
Dependent Claim
18 words
A process as claimed in claim 2 in which said trough is between said first and second harmonics.
Claim 7
Dependent Claim
18 words
A process as claimed in claim 2 in which said trough is between said second and third harmonics.
Claim 8
Dependent Claim
24 words
A process as claimed in claim 1 in which said first limited frequency band brackets the second harmonic of said frequency of maximum amplitude.
Claim 9
Dependent Claim
18 words
A process as claimed in claim 5 in which said trough is between said first and second harmonics.
Claim 10
Dependent Claim
18 words
A process as claimed in claim 5 in which said trough is between said second and third harmonics.
Claim 11
Dependent Claim
23 words
A process as claimed in claim 1 which comprises the step of amplitude limiting said electrical signal to reduce the effect of noise.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |