US3711765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of locating anomalous zones of chemical activity in a well bore
Assignee: Individual
•
Filing: 1970-09-09
•
Granted: 1973-01-16
•
Expires: 1990-09-09
Abstract
Abstract A method of locating anomalous zones of chemical activity in a well bore by measuring one or more cationic potentials and the redox (reduction-oxidation) potential of shale cuttings obtained from the well bore at different elevations during the drilling thereof, and graphically representing the different values to obtain comparisons which are indicative of the location of petroleum formations in the well bore.
Inventors
- 👤 H Overton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:42
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/24; G01N33/241; E; E21; E21B; E21B49/00; E21B49/005
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
13 words
The method set forth in claim 1, wherein: said one cation is calcium.
Claim 2
Dependent Claim
59 words
The method set forth in claim 2, including: measuring the potassium ion potential of said filtrate produced from the shale cuttings obtained from each of said elevations in the well bore; and also graphically representing the measurements of the potassium ion potential at the successive elevations for further substantiating and interpreting the comparative information from the other two graphs.
Claim 3
Dependent Claim
20 words
The method set forth in claim 1, wherein: said filtrate is produced by filtering out the solids from drilling mud.
Claim 4
Dependent Claim
32 words
The method set forth in claim 1, wherein said filtrate is produced by the additional steps of: washing the cuttings free of drilling mud; and thereafter drying the cuttings before grinding same.
Claim 5
Dependent Claim
32 words
The method set forth in claim 5, wherein: the cuttings are dried at a temperature no higher than 200*C; and the dried cuttings are ground to about 80 mesh size or smaller.
Claim 6
Dependent Claim
13 words
The method set forth in claim 5, wherein: said one cation is calcium.
Claim 7
Dependent Claim
55 words
The method set forth in claim 7, including: measuring the potassium ion potential of the filtrate from the shale cuttings from successive elevations in a well bore; and also graphically representing the measurements of the potassium ion potential at the successive elevations for further substantiating and interpreting the comparative information from the other two graphs.
References Cited (Backward Citations)
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US2692755A
Cited
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Cited
US3098198A
Cited
US3464000A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |