US3237094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method utilizing formation resistivity measurements for determining formation fluid pressures
Assignee: Shell USA Inc
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Filing: 1962-09-28
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Granted: 1966-02-22
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Expires: 1982-09-28
Abstract
No abstract record available.
Inventors
- 👤 Charles L Blackburn
- 👤 Clarence E Hottman
- 👤 Robert K Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:23
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/06; G; G01; G01V; G01V3/00; G01V3/18; G01V3/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A METHOD FOR DETECTING THE FLUID PRESSURE GRADIENT OF A PERMEABLE SUBSURFACE EARTH FORMATION PENETRATED BY A BOREHOLE, SAID METHOD COMPRISING: MEASURING THE INDIVIDUAL RESISTIVITIES OF THE SHALE FORMATIONS PENETRATED BY THE BOREHOLE; RECORDING THE RESISTIVITIES WITH RELATION TO THE DEPTH OF THE POINT OF MEASUREMENT IN THE BOREHOLE; CONTINUING TO MEASURE SAID RESISTIVITIES AS SAID BOREHOLE IS DRILLED; AND MEASURING THE DIFFERENCE BETWEEN SAID RECORDED RESISTIVITIES IN ABNORMALLY PRESSURED SHALE FORMATIONS PENETRATED BY THE BOREHOLE AND A PROJECTION TO THE DEPTH OF THE ABNORMALLY PRESSURED SHALE FORMATIONS OF A MEASURED RESISTIVITY OF THE TREND WITH DEPTH OF THE RESISTIVITIES IN NORMALLY PRESSURED SHALE FORMATIONS PENETRATED BY THE BOREHOLE TO DETERMINE THE FLUID PRESSURE GRADIENT OF AN ADJACENT PERMEABLE SUBSURFACE EARTH FORMATION.
Claim 2
Independent Claim
122 words
A METHOD FOR DETECTING THE FLUID PRESSURE GRADIENT OF A PERMEABLE SUBSURFACE EARTH FORMATION PENETRATED BY A BOREHOLE, SAID METHOD COMPRISING: MEASURING THE INDIVIDUAL RESISTIVITIES OF THE SHALE FORMATIONS PENETRATED BY THE BOREHOLE; RECORDING THE RESISTIVITIES WITH RELATION TO THE DEPTH OF THE POINT OF MEASUREMENT IN THE BOREHOLE; CONTINUING TO MEASURE SAID RESISTIVITIES AS SAID BOREHOLE IS DRILLED; AND MEASURING THE DIFFERENCE BETWEEN SAID RECORDED RESISTIVITIES IN ABNORMALLY PRESSURED SHALE FORMATIONS PENETRATED BY THE BOREHOLE AND A PROJECTION TO THE DEPTH OF THE ABNORMALLY PRESSURED SHALE FORMATIONS OF A MEASURED RESISTIVITY OF THE TREND WITH DEPTH OF THE RESISTIVITIES IN NORMALLY PRESSURED SHALE FORMATIONS PENETRATED BY THE BOREHOLE TO DETERMINE THE FLUID PRESSURE GRADIENT OF AN ADJACENT PERMEABLE SUBSURFACE EARTH FORMATION.
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) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |