US3770378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for detecting geopressures
Assignee: Cities Service Oil Co
•
Filing: 1971-06-18
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Granted: 1973-11-06
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Expires: 1991-06-18
Abstract
Abstract Interstitial waters of geopressured shale sections and the transition zone lying above the geopressured shale zones are measured for total salinity or elemental cationic concentration. Variances in these measurements are utilized to obtain a real time method for detecting geopressured shale zones.
Inventors
- 👤 K Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:19
CPC Classifications
E; E21; E21B; E21B49/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
17 words
The method of claim 1 in which the interstitial waters are pressed from the drill bit cuttings.
Claim 2
Dependent Claim
32 words
The method of claim 1 further comprising plotting the cationic concentration of the waters versus depth to form a log to aid in the determination of any change in the cationic concentration.
Claim 3
Dependent Claim
29 words
A method of claim 3 in which the cationic concentration measured is for one or more elements elected from the group consisting of sodium, calcium, potassium, iron and magnesium.
Claim 4
Independent Claim
75 words
A method for the detection of geopressured sHale formation during the drilling of a well which comprises: a. producing drill bit cuttings having interstitial water from said well; b. pressing said interstitial waters from said drill bit cuttings; c. measuring the resistivity of said interstitial waters to analyze the salinity of said waters; and d. determining a large decrease in said salinity which indicates the entrance of the drill bit into a geopressured shale formation.
Claim 5
Dependent Claim
30 words
The method of claim 5 further comprising plotting the resistivity of the waters versus depth to form a resistivity log to aid in the determination of any decrease in salinity.
References Cited (Backward Citations)
US3237094A
Cited
US3628131A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |