GB2148474A - Cryogenic cell - Google Patents
Cryogenic cell Download PDFInfo
- Publication number
- GB2148474A GB2148474A GB8426340A GB8426340A GB2148474A GB 2148474 A GB2148474 A GB 2148474A GB 8426340 A GB8426340 A GB 8426340A GB 8426340 A GB8426340 A GB 8426340A GB 2148474 A GB2148474 A GB 2148474A
- Authority
- GB
- United Kingdom
- Prior art keywords
- shield
- cryogenic cell
- chamber
- detector
- inner chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000007788 liquid Substances 0.000 claims description 6
- 239000002250 absorbent Substances 0.000 claims description 5
- 230000002745 absorbent Effects 0.000 claims description 5
- 239000003507 refrigerant Substances 0.000 claims description 5
- 230000005855 radiation Effects 0.000 claims description 4
- 230000002285 radioactive effect Effects 0.000 claims description 4
- 239000000523 sample Substances 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 12
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000001294 propane Substances 0.000 description 6
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 230000004913 activation Effects 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000005251 gamma ray Effects 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000002808 molecular sieve Substances 0.000 description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 241000224421 Heterolobosea Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000004078 cryogenic material Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000008246 gaseous mixture Substances 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical group [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000010249 in-situ analysis Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003947 neutron activation analysis Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C3/00—Vessels not under pressure
- F17C3/02—Vessels not under pressure with provision for thermal insulation
- F17C3/08—Vessels not under pressure with provision for thermal insulation by vacuum spaces, e.g. Dewar flask
- F17C3/085—Cryostats
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/001—Cooling arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
- G01V5/04—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/03—Orientation
- F17C2201/032—Orientation with substantially vertical main axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/01—Reinforcing or suspension means
- F17C2203/014—Suspension means
- F17C2203/018—Suspension means by attachment at the neck
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/03—Thermal insulations
- F17C2203/0375—Thermal insulations by gas
- F17C2203/0387—Cryogen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/03—Thermal insulations
- F17C2203/0391—Thermal insulations by vacuum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
- F17C2203/0602—Wall structures; Special features thereof
- F17C2203/0612—Wall structures
- F17C2203/0626—Multiple walls
- F17C2203/0631—Three or more walls
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
- F17C2203/0634—Materials for walls or layers thereof
- F17C2203/0636—Metals
- F17C2203/0639—Steels
- F17C2203/0643—Stainless steels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/03—Dealing with losses
- F17C2260/031—Dealing with losses due to heat transfer
- F17C2260/033—Dealing with losses due to heat transfer by enhancing insulation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/04—Reducing risks and environmental impact
- F17C2260/042—Reducing risk of explosion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/05—Improving chemical properties
- F17C2260/053—Reducing corrosion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2270/00—Applications
- F17C2270/05—Applications for industrial use
- F17C2270/0518—Semiconductors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2270/00—Applications
- F17C2270/05—Applications for industrial use
- F17C2270/0545—Tools
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Measurement Of Radiation (AREA)
Description
SPECIFICATION
Cryogenic cell
This invention relates to a cryogenic cell and more particularly to a cryogenic cell suitable for use in a neutron activation analysis borehole logging tool.
Borehole logging tools comprise a probe for insertion down the borehole, the probe comprising a radioactive source of neutrons, a shield against radioactivity and a gamma ray detector.
The gamma spectrum obtained from the neutron-gamma method registers the stimu lated emission of gamma rays when the radioactive source is used to bombard the formation surrounding the bore hole with neutrons.
It can be interpreted to give an indication of the nature of the formation.
Such tools are used for well logging in the petroleum industry.
Attention is now turning to the in-situ analy- sis of coal deposits with particular reference to the sulphur content. However, this gives rise to considerable problems. The ten major ele- ments present in coal produce a complex activation gamma spectrum comprising some four hundred gamma lines in the range 0.0 to 10.0 MeV. This implies a mean separation of 25 KeV between lines. In practice, many lines of interest are separated by less than 25 KeV.
Therefore it follows that a gamma ray detector with the capability to resolve lines appreciably less than 25 KeV apart is required.
This restricts the choice of detector to a semi-conductor detector and since the latter must be kept at low temperatures (around -180 C) some form of intensive cooling is necessary.
Another proposal has been to take advantage of the latent heat of fusion of substances such as propane with melting points around
-180 C. According to one method of operation, the melting hydrocarbon is contained in a Dewar flask and the resulting vapours are allowed to escape. This has the advantage of maintaining the temperature constant over longer periods but suffers from the disadvantages of the loss of refrigerant and more seriously, the production of a potentially explosive gaseous mixture. Another disadvantage lies in the requirement to use liquid nitrogen in order to cool the hydrocarbon to below its melting point. This process precludes use of the technique in remote areas of the world where liquid nitrogen is unavailable.
It is an object of the present invention to produce a safe, totally enclosed cryogenic neutron activation logging tool which does not suffer from the above disadvantages.
Thus according to the present invention there is provided a cryogenic cell comprising a sealed external annular chamber, adapted to be maintained under vacuum and surrounding an isothermal heat shield, a section of the shield being exposed and adapted to make contact with a closed cycle cooler, the shield enclosing a sealed inner chamber adapted for the storage of a solid/liquid refrigerant, the shield having a well in its upper regon immediately above and in contact with the top of the inner chamber, the inner chamber being connected at its lower end to a section containing an absorbent, the latter section being connected at its lower end to a further chamber suitable for the reception of a gamma radiation detector.
The outer wall of the external chamber is preferably fabricated from a metal resistant to corrosion and of high tensile strength such as stainless steel.
The walls of the isothermal heat shield and internal chamber are preferably fabricated from a material of high thermal conductivity such as copper. The shield is constrained to be relatively thin where it surrounds the inner chamber and is preferably thick where it is exposed.
The well in the isothermal heat shield is adapted to receive a"cold finger"and to transmit the ensuing low temperature to the inner chamber so that the refrigerant is substantially solidified before the commencement of operations, although a small vapour space is preferably left. This eliminates the use of intermediate cryogenic materials such as liquid nitrogen.
The absorbent in the lower tube acts as a cryopump and absorbs impurities within the vacuum chamber. Suitable absorbents include molecular sieves and activated carbon.
Suitable refrigerants include hydrocarbons such as propane and butene-1.
As stated previously the cryogenic cell is particularly suitable for use in maintaining the gamma ray detector of a neutron activation logging tool at the required low temperature.
Thus according to another aspect of the present invention there is provided a neutron logging tool comprising a probe containing in sequence from the bottom end a radioactive source of neutrons, a shield against radioactivity, a semi-conductor detector for gamma radiation and a cryogenic cell as hereinbefore described for maintaining the detector at a low temperature, the detector being positioned in the lowermost chamber of the cryogenic cell.
A suitable source is a 5Ci Amibe neutron source, such as obtained from Amersham International.
The shield is preferably a composite shield assembly comprising a heavy metal scatterer and a hydrogenous moderator.
A suitable detector is a germanium crystal.
The output of a semi-conductor detector is of the order of picoamps and therefore a preamplifier is necessary. Losses and noise may be reduced by positioning the preampli fier in a separate compartment as physically close to the detector as possible. The preamplifier field effect transistor is preferably positioned on the pre-amplifier printed circuit board-this is referred to as a warm FET configuration nd avoids the use of a cold
FET within the vacuum chamber.
The cryogenic cell may be chilled by com mercially available closed cycle coolers comprising cold fingers.
Above the cryogenic cell will be the detector EHT supply, the main amplifier and the cable driver which transmits an analogue signal via an ordinary armoured single-core logging cable.
The invention is illustrated with reference to
Fig. 1 of the accompanying drawing which is a schematic section of a cryogenic cell.
The cell comprises an inner, oxygen free copper pressure vessel 1 containing mostly solid/liquid propane 2 of 99.99% purity, although a small vapour space 3 is left. The purity level of the propane is important to reduce the risks of supercooling and eutectic shifts in melting point.
The cell is initially charged with propane and then sealed for life. Alternatively the cell may be charged with butene-1 and then sealed for life. Butene-1 offers approximately 3% improvement in holding time over propane.
The inner vessel 1 is placed within a copper isothermal heat shield 4 and the space 5 between the two vessels is evacuated to provide a vacuum.
The heat shield 4 is itself placed within a stainless steel outer vessel 6 and the space 7 between is also evacuated to provide a vacuum. It has a central aperture 8 into which is fitted a stainless steel wall 9, the bottom of the well being directly above the top of the inner vessel 1.
At its lower end, the inner vessel 1 is formed into a cylindrical section 10 containing apertures 11 for containing a molecular sieve absorbent for removing traces of impurities from the vacuum.
A hollow aluminium block 12 containing a detector 13 is connected to the cylindrical section 10.
In order to chill the contents of the ceil before operating the logging tool, a closed cycle cooler is contacted with the exposed upper surface of the heat shield 4 and a"cold finger"is inserted into the well 9.
Claims (7)
1. A cryogenic cell comprising a sealed external annular chamber, adapted to be maintained under vacuum and surrounding an isothermal heat shield, a section of the shield being exposed and adapted to make contact with a closed cycle cooler, the shield enclosing a sealed inner chamber adapted for the storage of a solid/liquid refrigerant, the shield having a well in its upper region immediately above and in contact with the top of the inner chamber, the inner chamber being connected at its lower end to a section containing an absorbent, the latter section being connected at its lower end to a further chamber suitable for the reception of a gamma radiation detector.
2. A cryogenic cell according to claim 1 wherein the outer wall of the external chamber is fabricated from stainless steel.
3. A cryogenic cell according to either of the preceding claims wherein the walls of the isothermal heat shield and internal chamber are fabricated from a material of high thermal conductivity.
4. A cryogenic cell according to claim 3 wherein the shield is relatively thin where it surrounds the inner chamber and thick where it is exposed.
5. A cryogenic cell according to any of the preceding claims wherein the well in the isothermal heat shield is adapted to receive a cold finger and to transmit the ensuing low temperature to the inner chamber.
6. A neutron logging tool comprising a probe containing in sequence from the bottom end a radioactive source of neutrons, a shield against radioactivity, a semi-conductor detector for gamma radiation and a cryogenic cell according to any of the preceding claims for maintaining the detector at a low temperature, the detector being positioned in the lowermost chamber of the cryogenic cell.
7. A cryogenic cell as hereinbefore described with reference to the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19850301168 EP0191962A1 (en) | 1983-10-21 | 1985-02-21 | Cryogenic cell |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB838328236A GB8328236D0 (en) | 1983-10-21 | 1983-10-21 | Cryogenic cell |
| EP19850301168 EP0191962A1 (en) | 1983-10-21 | 1985-02-21 | Cryogenic cell |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8426340D0 GB8426340D0 (en) | 1984-11-21 |
| GB2148474A true GB2148474A (en) | 1985-05-30 |
| GB2148474B GB2148474B (en) | 1987-02-18 |
Family
ID=26098237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8426340A Expired GB2148474B (en) | 1983-10-21 | 1984-10-18 | Cryogenic cell |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2148474B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0191962A1 (en) * | 1983-10-21 | 1986-08-27 | The British Petroleum Company p.l.c. | Cryogenic cell |
| AU580755B2 (en) * | 1983-10-21 | 1989-02-02 | British Petroleum Company Plc, The | Cryogenic cell |
| WO2000020795A2 (en) * | 1998-09-14 | 2000-04-13 | Massachusetts Institute Of Technology | Superconducting apparatuses and cooling methods |
| GB2504250A (en) * | 1989-01-23 | 2014-01-29 | Hughes Aircraft Co | Cooling system for seeker head |
-
1984
- 1984-10-18 GB GB8426340A patent/GB2148474B/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0191962A1 (en) * | 1983-10-21 | 1986-08-27 | The British Petroleum Company p.l.c. | Cryogenic cell |
| AU580755B2 (en) * | 1983-10-21 | 1989-02-02 | British Petroleum Company Plc, The | Cryogenic cell |
| GB2504250A (en) * | 1989-01-23 | 2014-01-29 | Hughes Aircraft Co | Cooling system for seeker head |
| GB2504250B (en) * | 1989-01-23 | 2015-07-22 | Hughes Aircraft Co | Cryogenic cooling system for airborne use |
| WO2000020795A2 (en) * | 1998-09-14 | 2000-04-13 | Massachusetts Institute Of Technology | Superconducting apparatuses and cooling methods |
| WO2000020795A3 (en) * | 1998-09-14 | 2000-07-27 | Massachusetts Inst Technology | Superconducting apparatuses and cooling methods |
| US6622494B1 (en) | 1998-09-14 | 2003-09-23 | Massachusetts Institute Of Technology | Superconducting apparatus and cooling methods |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8426340D0 (en) | 1984-11-21 |
| GB2148474B (en) | 1987-02-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4658601A (en) | Cryogenic cell | |
| Pan et al. | The pressure and temperature dependence of carbon dioxide solubility in tholeiitic basalt melts | |
| Ito et al. | An experimental study of the basalt‐garnet granulite‐eclogite transition | |
| US4559790A (en) | Apparatus for maintaining electronic equipment and the like at low temperatures in hot ambient environments | |
| US3038074A (en) | Temperature-regulated well-logging apparatus | |
| US3702932A (en) | Melting cryogen cooling for radiation logging probe | |
| SU1281182A3 (en) | Cryostat for high-sensitive photon detector | |
| US3435629A (en) | Borehole logging technique | |
| US3049620A (en) | Scintillation detector cooling system | |
| Sedwick et al. | Carbon dioxide and helium in hydrothermal fluids from Loihi Seamount, Hawaii, USA: temporal variability and implications for the release of mantle volatiles | |
| GB2148474A (en) | Cryogenic cell | |
| Tanner et al. | A probe for neutron activation analysis in a drill hole using 252Cf, and a Ge (Li) detector cooled by a melting cryogen | |
| GB2139745A (en) | Cryogenic cell | |
| EP0191962A1 (en) | Cryogenic cell | |
| CA1238795A (en) | Cryogenic cell | |
| US3379032A (en) | Temperature stabilization apparatus for well logging systems | |
| JPS61202180A (en) | Cryogenic cell | |
| GB2153058A (en) | Cryogenic cell for neutron borehole logging tool | |
| NO850748L (en) | KRYOGEN CELLE. | |
| US3149741A (en) | Vacuum container | |
| US4568830A (en) | Borehole gamma ray logging detector | |
| EP0129954A1 (en) | A passive temperature control system | |
| Gaffney et al. | Liquid Helium Level‐Finder | |
| Blattner | Oxygen from liquids for isotopic analysis, and a new determination of αCO2− H2O at 25° C | |
| Jackson et al. | Carbon stable isotope analysis of fluid inclusions by stepped heating |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |