US3859523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature well logging instrument having increased utilization of dewar flasks
Assignee: Western Atlas International Inc
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Filing: 1973-01-26
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Granted: 1975-01-07
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Expires: 1993-01-26
Abstract
Abstract Three modular components of a well logging instrument are illustrated for use in 500* F. wells. Each modular component utilizes a Dewar flask and a heat sink chosen specifically for the respective internal component. One modular component utilizes a Geiger-Muller counter with a heat sink comprised of a eutectic alloy having a eutectic temperature of 281* F. A second modular component utilizes a scintillation counter and a heat sink having a eutectic temperature of 158* F. A third modular component utilizes an electronics section and a heat sink having a eutectic temperature of 281* F. To enable the modular components to be utilized in a single well logging instrument, the volumes of the heat sinks are adjusted as by increasing the volume of heat sink material having the lower eutectic temperature.
Inventors
- 👤 Billy F Wilson
- 👤 William H Spidell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:06
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/01; E21B47/017; E21B47/0175; F; F25; F25D; F25D3/00; G; G01; G01V; G01V5/00; G01V5/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
149 words
A well logging apparatus for logging very hot wells, comprising: an elongated housing adapted to traverse said wells; a first double-walled enclosure in said housing defining a first sealed-off space interior to the walls of said first enclosure, said first space being at least partially evacuated; a first mass of material in said first space having a given heat sink capability; a first well logging element in said first space for producing signals representative of a physical condition in said well; a second double-walled enclosure in said housing defining a second sealed-off space interior to the walls of said second enclosure, said second space being at least partially evacuated; a second mass of material in said second space having a given heat sink capability; and electronic circuitry in said second space electrically connected to said first well logging element for conditioning said signals for transmission to the earth''s surface.
Claim 2
Dependent Claim
149 words
A well logging apparatus for logging very hot wells, comprising: an elongated housing adapted to traverse said wells; a first double-walled enclosure in said housing defining a first sealed-off space interior to the walls of said first enclosure, said first space being at least partially evacuated; a first mass of material in said first space having a given heat sink capability; a first well logging element in said first space for producing signals representative of a physical condition in said well; a second double-walled enclosure in said housing defining a second sealed-off space interior to the walls of said second enclosure, said second space being at least partially evacuated; a second mass of material in said second space having a given heat sink capability; and electronic circuitry in said second space electrically connected to said first well logging element for conditioning said signals for transmission to the earth''s surface.
Claim 3
Dependent Claim
28 words
The apparatus according to claim 1 wherein said given heat sink capability of said first mass is equal to said given heat sink capability of said second mass.
Claim 4
Dependent Claim
28 words
The apparatus according to claim 1 wherein said given heat sink capability of said first mass is different from said given heat sink capability of said second mass.
Claim 5
Dependent Claim
16 words
The apparatus according to claim 1 wherein said first well logging unit comprises a scintillation counter.
Claim 6
Dependent Claim
16 words
The apparatus according to claim 1 wherein said first well logging unit comprises a Geiger-Muller counter.
Claim 7
Dependent Claim
98 words
In a method for logging very hot wells wherein first and second Dewar flasks are used within a well logging instrument wherein a first well logging element having a first given maximum operating temperature is placed in said first flask and a second well logging element having a second given maximum operating temperature diffeRent from said first maximum operating temperature is placed in said second flask, the improvement comprising the step of using a first sink material in said first flask and a second heat sink material different from said first heat sink material in said second flask.
Claim 8
Dependent Claim
98 words
In a method for logging very hot wells wherein first and second Dewar flasks are used within a well logging instrument wherein a first well logging element having a first given maximum operating temperature is placed in said first flask and a second well logging element having a second given maximum operating temperature diffeRent from said first maximum operating temperature is placed in said second flask, the improvement comprising the step of using a first sink material in said first flask and a second heat sink material different from said first heat sink material in said second flask.
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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |