US4603113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion testing
Assignee: Individual
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Filing: 1984-03-12
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Granted: 1986-07-29
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Expires: 2004-03-12
Abstract
Abstract Techniques and apparatus are described for measurement of corrosion of drill pipe in a well bore during drilling. The techniques involve the use of a test coupon attached to the external surface of a drill string. In a preferred embodiment the test coupon comprises a metal plate mounted in an insulating material such as plastic. The test coupon is preferably secured within a recess in the external surface of a sub connected between segments of a drill string.
Inventors
- 👤 Donald Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:29
CPC Classifications
G; G01; G01N; G01N17/00; Y; Y10; Y10S; Y10S166/00; Y10S166/902
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
107 words
A method for measuring corrosion in a well bore during drilling, said method comprising the steps of: (a) providing a drill string; (b) positioning an internal corrosion test ring within said drill string in a manner such that said test ring is exposed to internal fluids within said string; (c) positioning a corrosion test coupon on the external surface of said drill string in such a manner that said test coupon is exposed to fluids within said well bore externally of said drill string; (d) measuring the amount of corrosion of said test ring and said test coupon after operating said drilling string in said well bore.
Claim 2
Independent Claim
107 words
A method for measuring corrosion in a well bore during drilling, said method comprising the steps of: (a) providing a drill string; (b) positioning an internal corrosion test ring within said drill string in a manner such that said test ring is exposed to internal fluids within said string; (c) positioning a corrosion test coupon on the external surface of said drill string in such a manner that said test coupon is exposed to fluids within said well bore externally of said drill string; (d) measuring the amount of corrosion of said test ring and said test coupon after operating said drilling string in said well bore.
Claim 3
Dependent Claim
20 words
A method in accordance with claim 1, wherein said test coupon comprises a metal plate mounted in an insulating material.
Claim 4
Dependent Claim
40 words
A method in accordance with claim 2, wherein said metal plate comprises a layer of steel and said insulating material comprises plastic, and wherein one major surface of said layer is exposed to said fluids externally of said drill string.
Claim 5
Dependent Claim
34 words
A method in accordance with claim 3, wherein said layer has a length in the range of about 0.5 to 6 inches and a width in the range of about 0.25 to 1.5 inch.
Claim 6
Dependent Claim
24 words
A method in accordance with claim 1, wherein said test coupon is attached to a sub connected between adjacent segments of said drill string.
Claim 7
Dependent Claim
19 words
A method in accordance with claim 5, wherein said test coupon is retained in a recess in said sub.
Claim 8
Dependent Claim
41 words
A method in accordance with claim 6, wherein said recess is elongated and wherein said test coupon is retained in said recess in a manner such that a portion of the walls of said recess is exposed above said test coupon.
Claim 9
Dependent Claim
15 words
A method in accordance with claim 7, wherein said walls of said recess are sloped.
Claim 10
Dependent Claim
27 words
A method in accordance with claim 7, wherein the top portion of said recess is angled approximately 1° to 20° from the longitudinal axis of said sub.
Claim 11
Dependent Claim
30 words
A method in accordance with claim 5, wherein said internal corrosion test ring is retained between one end of said sub and one of said segments of said drill string.
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) | 1989-07-28 | 1990-01-27 | 1990-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-28 | 1994-01-27 | 1994-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-28 | 1998-01-27 | 1998-07-29 | $7700.00 | Window Closed / Lapsed |