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US3946604A
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Methods and apparatus for determining characteristics of subsurface earth formations
Assignee: Schlumberger Technology Corp
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Filing: 1973-10-05
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Granted: 1976-03-30
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Expires: 1993-10-05
Abstract
Abstract In accordance with illustrative embodiments of the present invention, measurements of a plurality of earth formation parameters are combined in a new manner to establish Poisson's ratio for the formations surrounding a borehole which is useful for identifying mechanically competent formations.
Inventors
- 👤 Ronald A. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:41
CPC Classifications
G; G01; G01V; G01V11/00; E; E21; E21B; E21B49/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
75 words
A machine method of determining characteristics of an earth formation traversed by a borehole, comprising the steps of: a. providing a plurality of well-logging measurements, indicative of a plurality of properties of the formation at selected depth levels; b. combining said measurements to provide a first parameter indicative of the shale content of the formation at selected depth levels; and c. producing a representation of Poisson's ratio from said first parameter at selected depth levels.
Claim 2
Dependent Claim
75 words
A machine method of determining characteristics of an earth formation traversed by a borehole, comprising the steps of: a. providing a plurality of well-logging measurements, indicative of a plurality of properties of the formation at selected depth levels; b. combining said measurements to provide a first parameter indicative of the shale content of the formation at selected depth levels; and c. producing a representation of Poisson's ratio from said first parameter at selected depth levels.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein the parameter indicative of the shale content of the formation is the shale index.
Claim 4
Dependent Claim
33 words
The method of claim 2 wherein Poisson's ratio is computed according to: ν = Aq + B Where: A and B are constants, q is the shale index, and ν is Poisson's ratio.
Claim 5
Dependent Claim
80 words
Apparatus for determining characteristics of an earth formation traversed by a borehole, comprising: a. means for providing a plurality of well-logging measurements indicative of a plurality of properties of a formation at selected depth levels; b. means for combining at least some of said measurements to provide a first parameter indicative of the shale content of the formation at selected depth levels; and c. means for producing a representation of Poisson's ratio from said first parameter at selected depth levels.
Claim 6
Dependent Claim
80 words
Apparatus for determining characteristics of an earth formation traversed by a borehole, comprising: a. means for providing a plurality of well-logging measurements indicative of a plurality of properties of a formation at selected depth levels; b. means for combining at least some of said measurements to provide a first parameter indicative of the shale content of the formation at selected depth levels; and c. means for producing a representation of Poisson's ratio from said first parameter at selected depth levels.
Claim 7
Dependent Claim
20 words
The apparatus of claim 4 wherein the parameter indicative of the shale content of the formation is the shale index.
Claim 8
Dependent Claim
33 words
The apparatus of claim 5 wherein Poisson's ratio is computed according to: ν = Aq + B Where: A and B are constants, q is the shale index, and ν is Poisson's ratio.
References Cited (Backward Citations)
US3638484A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |