US3789935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Angular accelerometer
Assignee: Texaco Inc
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Filing: 1971-10-19
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Granted: 1974-02-05
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Expires: 1991-10-19
Abstract
Abstract An angular accelerometer which employs an annular conduit filled with a dielectric fluid. The conduit is blocked at at least one point and there are piezoresponsive elements mounted so as to have the fluid directly apply pressure thereto. The elements are mounted adjacent to the blocked portion of the conduit, one on either side thereof. The structure is adapted for use with a drilling bit in order to indicate eccentricities during drilling as well as to measure instantaneous angular acceleration.
Inventors
- 👤 F Saadeh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:29
CPC Classifications
G; G01; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/0888; G01P15/09
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
171 words
In combination with a drill bit, having a longitudinal axis and being adapted for drilling oil wells or the like, a collar adjacent to said bit, an angular accelerometer for measuring eccentricity of rotation of a rotating member having an axis of rotation, said accelerometer comprising an annular conduit having an axis and being filled with a dense dielectric fluid, means for mounting said conduit with the axis thereof coinciding with said axis of rotation, at least two barriers diametrically opposed in said conduit providing two ends each for said conduit, a pair of piezoelectric transducers adjacent to, but on opposite sides of each of said barriers, means for mounting said transducers subject to pressure changes in said fluid due to acceleration forces, electrical circuit means for amplifying and combining the output signals from said pairs of transducers in order to provide measurement of the eccentricity of rotation of said rotating member, and means for mounting said accelerator with said axis of rotation coinciding with the longitudinal axis of said bit.
Claim 2
Dependent Claim
171 words
In combination with a drill bit, having a longitudinal axis and being adapted for drilling oil wells or the like, a collar adjacent to said bit, an angular accelerometer for measuring eccentricity of rotation of a rotating member having an axis of rotation, said accelerometer comprising an annular conduit having an axis and being filled with a dense dielectric fluid, means for mounting said conduit with the axis thereof coinciding with said axis of rotation, at least two barriers diametrically opposed in said conduit providing two ends each for said conduit, a pair of piezoelectric transducers adjacent to, but on opposite sides of each of said barriers, means for mounting said transducers subject to pressure changes in said fluid due to acceleration forces, electrical circuit means for amplifying and combining the output signals from said pairs of transducers in order to provide measurement of the eccentricity of rotation of said rotating member, and means for mounting said accelerator with said axis of rotation coinciding with the longitudinal axis of said bit.
Claim 3
Dependent Claim
15 words
The combination according to claim 1 wherein said mounting means is integral with said collar.
Claim 4
Dependent Claim
35 words
The combination according to claim 2 further including an annular chamber in said collar for housing said accelerometer and related elements, and passage means axially through said collar for allowing drilling fluid to flow therethrough.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |