Patent US3987294A successfully refreshed from Google Patents.
Patent US3134941A successfully refreshed from Google Patents.
US3134941A
Expired / Lapsed
US
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Borehole diameter and lateral depth of fluid invasion indicator
Assignee: Dresser Industries Inc
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Filing: 1961-05-19
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Granted: 1964-05-26
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Expires: 1981-05-19
Abstract
No abstract record available.
Inventors
- 👤 Russell G Norelius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:21
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/08; E21B47/085; E21B47/10; E21B47/113; G; G01; G01V; G01V3/00; G01V3/18; G01V3/20; G01V3/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A METHOD OF INVESTIGATING EARTH FORMATIONS TRAVERSED BY A BORE HOLE WHILE THE HOLE IS SUBSTANTIALLY FILLED WITH DRILLING FLUID, THE FILTRATE FROM WHICH HAVING PENETRATED THE FORMATIONS TO VARYING RADIAL EXTENTS DEPENDING, IN PART, UPON THE PHYSICAL PROPERTIES OF THE FORMATIONS AND THEIR NATURAL FLUID CONTENT, OBTAINING A PLURALITY OF MEASUREMENTS EACH OF WHICH IS PRIMARILY A FUNCTION OF THE RESISTIVITY OF THE FORMATION INCLUDED IN THE REGION BETWEEN TWO SURFACES AT DIFFERENT RADIAL DISTANCES FROM THE BORE HOLE, THESE REGIONS OF INVESTIGATION RANGING FROM VERY NEAR THE BORE HOLE TO INCLUDE THE ZONE OF THE FORMATION CONTAINING PRINCIPALLY THE AFOREMENTIONED FILTRATE AND RANGING OUTWARD TO INCLUDE AT LEAST A PORTION OF THE UNDISTURBED ZONE OF THE FORMATION.
Claim 2
Independent Claim
119 words
A METHOD OF INVESTIGATING EARTH FORMATIONS TRAVERSED BY A BORE HOLE WHILE THE HOLE IS SUBSTANTIALLY FILLED WITH DRILLING FLUID, THE FILTRATE FROM WHICH HAVING PENETRATED THE FORMATIONS TO VARYING RADIAL EXTENTS DEPENDING, IN PART, UPON THE PHYSICAL PROPERTIES OF THE FORMATIONS AND THEIR NATURAL FLUID CONTENT, OBTAINING A PLURALITY OF MEASUREMENTS EACH OF WHICH IS PRIMARILY A FUNCTION OF THE RESISTIVITY OF THE FORMATION INCLUDED IN THE REGION BETWEEN TWO SURFACES AT DIFFERENT RADIAL DISTANCES FROM THE BORE HOLE, THESE REGIONS OF INVESTIGATION RANGING FROM VERY NEAR THE BORE HOLE TO INCLUDE THE ZONE OF THE FORMATION CONTAINING PRINCIPALLY THE AFOREMENTIONED FILTRATE AND RANGING OUTWARD TO INCLUDE AT LEAST A PORTION OF THE UNDISTURBED ZONE OF THE FORMATION.
References Cited (Backward Citations)
US2415364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-26 | 1967-11-25 | 1968-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-26 | 1971-11-25 | 1972-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-26 | 1975-11-25 | 1976-05-26 | $7700.00 | Window Closed / Lapsed |