CA1223675A - Probe for insertion into drill holes for the purpose of locating mineral deposits - Google Patents
Probe for insertion into drill holes for the purpose of locating mineral depositsInfo
- Publication number
- CA1223675A CA1223675A CA000451658A CA451658A CA1223675A CA 1223675 A CA1223675 A CA 1223675A CA 000451658 A CA000451658 A CA 000451658A CA 451658 A CA451658 A CA 451658A CA 1223675 A CA1223675 A CA 1223675A
- Authority
- CA
- Canada
- Prior art keywords
- probe
- irradiation
- detector
- source
- drill hole
- 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.)
- Expired
Links
- 239000000523 sample Substances 0.000 title claims abstract description 31
- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 7
- 239000011707 mineral Substances 0.000 title claims abstract description 7
- 230000037431 insertion Effects 0.000 title claims abstract 3
- 238000003780 insertion Methods 0.000 title claims abstract 3
- 230000002285 radioactive effect Effects 0.000 claims abstract description 6
- 230000005855 radiation Effects 0.000 claims description 20
- 239000004065 semiconductor Substances 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 3
- 229910052790 beryllium Inorganic materials 0.000 claims 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 claims 1
- 230000000638 stimulation Effects 0.000 claims 1
- 238000000354 decomposition reaction Methods 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 206010056740 Genital discharge Diseases 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- G01V5/08—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays
- G01V5/12—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using gamma or X-ray sources
-
- 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
- G01V5/08—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays
- G01V5/14—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using a combination of several sources, e.g. a neutron and a gamma source
Landscapes
- Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
- Compounds Of Unknown Constitution (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
- Photoreceptors In Electrophotography (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Measurement Of Radiation (AREA)
- Drilling And Boring (AREA)
Abstract
-ABSTRACT-The invention concerns a probe for insertion into drill holes for the purpose of locating mineral ore deposits. A radioactive source of irradiation and a detector for determining the fluorescent irradiation stimulated by the radioactive irradiation in the area of the drill hole, which detector is positioned opposite the source of irradiation, and is protected by a screen, are concentrically arranged within a cylindrical housing.
The detector has a reception surface standing vertically to the axis of the probe; this detector is turned to the source of irradiation. Through this arrangement of the reception surface, it can further advance to the part of the wall of the drill hole, which part, essentially ring-shaped, surrounds the source of irradiation, so that more fluorescent irradiation is collected from this ring-shaped area. It is thereby avoided that irradiation from areas of the drill hole wall lying in an axial direction on the further side of the reception surface is likewise collected, and that, in this way, the decomposition in the drill hole alignment, and the findings about the mineral deposits, are injured. The probe can be used in drill holes of small diameter.
The detector has a reception surface standing vertically to the axis of the probe; this detector is turned to the source of irradiation. Through this arrangement of the reception surface, it can further advance to the part of the wall of the drill hole, which part, essentially ring-shaped, surrounds the source of irradiation, so that more fluorescent irradiation is collected from this ring-shaped area. It is thereby avoided that irradiation from areas of the drill hole wall lying in an axial direction on the further side of the reception surface is likewise collected, and that, in this way, the decomposition in the drill hole alignment, and the findings about the mineral deposits, are injured. The probe can be used in drill holes of small diameter.
Description
~a~2~
The inven-tion concerns a probe of -the type stated in the higher concept of Patent Claim 1.
Probes of the type under discussion are known.
They serve in locating mineral deposits by using fluores-cences, which are stimulated by means of the radioactive source of irradiation located in the probe. The type and the character of a deposit can be determined by evaluating the fluorescent radiation. It can particularly be deter-mined whe-thex heavy metal or ferrous metal ores are present in the metal.
In the known probes, the reflection of -the radio-active irradiation occurs over a large area. Also, the reception of the fluorescent irradiation occurs over an extended area by means of a detector which extends over the width of the probe, so that a fine analysis of the composition of the deposits was not possible.
Through US-P~S ~ 909 661, a probe of the type under discussion is known, in which the radiati~n-sensitive sur~ace of a detector is located on its external circum-ferenae, and is therefore formed essen-tially as a cylinder surface coaxial to the probe's axis. It extends by means of a larger axial extension. From there, it records radiation from a relatively large area,-and its distance from the source of radiation is necessarily relatively great. A slight decomposition results from both, which makes a fine investigation impossible.
-- 1 -- ,i .,,~ .
~3G~
The execution of core borinys of slight diameter for the fine investiga-tion of the vertical composition was known from this. These are, however, time~consuming and costly. Moreover, core damage can occur, so that the advantages are essentially lost.
The present invention provides a probe of the type under discussion, by means of which the composition of deposits, especially ore mineral deposits, can be precisely scanned and analysed simply, cheaply, accurately and quickly, out of smaller-caliber test drill holes and with a small penetration area of the irradiation for transmissions and reception.
In a preferred form of the invention, the probe has a disc-shaped annular slot surrounding the radiation source, which slot is adjustable in width. The slot confines the rays to a practically disc-shaped irradiation of the drill hole wall so that only a narrow ring is irradiated, and thus stimulated to fluorescence.
Reflected fluorescent radiation is thereby collected by the receptor surface of the detector only from this narrow ring surface. Radiation from other areas does not impair the test results. There also occurs on the whole a greater clarity of detail which makes possible better findings about the mineral deposits. By concentrating the ~5 rays through the closely neighbouring slot surfaces, increased energy is reflected from the wall of the drill hole.
The path of the reflected rays is directed to the detector through an annular conical aperture in the probe wall so that the detector is located closer axially to the reflecting surface. Thus, the intensity of the radiation 3~
collected is increased and, fur-thermore, secondary fluoresc~nt irradiation reflected frorn d;rections other than the one wanted is curbed. Preferably the reception surface of the detector is circular, stands essentially vertical to the axis of the probe, and is turned to the radiation source. It can also be slightly inclined or, for example, even conically shaped. By the arran~ement of elements in accordance with the inven-tion, the reception surface is spaced only a short distance from the radiation source.
The adjustable disc-shaped slot through the wall of the housing and disposed normal to the axis of the probe is, like the irradiation, narrow so that the material comprising the wall can be correspondingly small. The sane applies to the area of the irradiation reflected from the fluorescene source onto the reception surface of the detector. The material above the slot shields the reception sur~ace ~rom direct radiation from the radiation source.
Especially suitable as a detector is a scintillation crystal or a semi-conductor, which do not require expensive cooling means such as is necessary in the semi-conductor crystals previously used.
The frusto-conical surfaces which de~ine the ~5 aperature, when extended beyond the points of the cone, suitably intersect the reception surface, so that no portion o~ the fluorescing radiation impinges on the borehole wall which lies opposite the reflec-ting surface, which, undesirably, can stimulate further development.
In the diagram, the single Figure is a side view of a probe, the left half of which is in section.
s The diagram shows an example o~ execution of a probe 1 in accordance with the invention, partially cut away axially and partially cut axially, so that, in the cut area, a wall 2 oF a drill hole 3 is indicated. The probe has a housing 4, in the internal space of which, coaxially to the housing9 a radioactive source of irradiation 5 is located, the irradiation of which passes through a slot 6 to the outside, which slot is formed between two aperture parts 7,8. The radiation limited to the slot 6 en-ters into the drill hole 3 through a wall portion 9 of the hou~sing 4, and irradiates a wall area of the wall 2 of the drill hole 3 which lies between two points 10,11, and exhibits the -form of a ring 12. This area of the drill hole wall is stimulated for fluorescence, according to the ores found in this area, and this fluorescent irradiation proceeds through a wall part 15 lying between two projections 13,14 aligned inwardly to the reception surface 16 of a detector 17, which can be a scintillation detector or a semi-conductor ~0 detector. The fluorescence signal is transformed into an intelligence signal electrically dependent on it.
The aperture part 7 has an external surface 18 clirected to the reception surface 16 of the detector 17, which surface is conical, and the extension of which, on the outside, meets approximately at point 11, that is, the approximate boundary of the irradiated ring 12 of the wall
The inven-tion concerns a probe of -the type stated in the higher concept of Patent Claim 1.
Probes of the type under discussion are known.
They serve in locating mineral deposits by using fluores-cences, which are stimulated by means of the radioactive source of irradiation located in the probe. The type and the character of a deposit can be determined by evaluating the fluorescent radiation. It can particularly be deter-mined whe-thex heavy metal or ferrous metal ores are present in the metal.
In the known probes, the reflection of -the radio-active irradiation occurs over a large area. Also, the reception of the fluorescent irradiation occurs over an extended area by means of a detector which extends over the width of the probe, so that a fine analysis of the composition of the deposits was not possible.
Through US-P~S ~ 909 661, a probe of the type under discussion is known, in which the radiati~n-sensitive sur~ace of a detector is located on its external circum-ferenae, and is therefore formed essen-tially as a cylinder surface coaxial to the probe's axis. It extends by means of a larger axial extension. From there, it records radiation from a relatively large area,-and its distance from the source of radiation is necessarily relatively great. A slight decomposition results from both, which makes a fine investigation impossible.
-- 1 -- ,i .,,~ .
~3G~
The execution of core borinys of slight diameter for the fine investiga-tion of the vertical composition was known from this. These are, however, time~consuming and costly. Moreover, core damage can occur, so that the advantages are essentially lost.
The present invention provides a probe of the type under discussion, by means of which the composition of deposits, especially ore mineral deposits, can be precisely scanned and analysed simply, cheaply, accurately and quickly, out of smaller-caliber test drill holes and with a small penetration area of the irradiation for transmissions and reception.
In a preferred form of the invention, the probe has a disc-shaped annular slot surrounding the radiation source, which slot is adjustable in width. The slot confines the rays to a practically disc-shaped irradiation of the drill hole wall so that only a narrow ring is irradiated, and thus stimulated to fluorescence.
Reflected fluorescent radiation is thereby collected by the receptor surface of the detector only from this narrow ring surface. Radiation from other areas does not impair the test results. There also occurs on the whole a greater clarity of detail which makes possible better findings about the mineral deposits. By concentrating the ~5 rays through the closely neighbouring slot surfaces, increased energy is reflected from the wall of the drill hole.
The path of the reflected rays is directed to the detector through an annular conical aperture in the probe wall so that the detector is located closer axially to the reflecting surface. Thus, the intensity of the radiation 3~
collected is increased and, fur-thermore, secondary fluoresc~nt irradiation reflected frorn d;rections other than the one wanted is curbed. Preferably the reception surface of the detector is circular, stands essentially vertical to the axis of the probe, and is turned to the radiation source. It can also be slightly inclined or, for example, even conically shaped. By the arran~ement of elements in accordance with the inven-tion, the reception surface is spaced only a short distance from the radiation source.
The adjustable disc-shaped slot through the wall of the housing and disposed normal to the axis of the probe is, like the irradiation, narrow so that the material comprising the wall can be correspondingly small. The sane applies to the area of the irradiation reflected from the fluorescene source onto the reception surface of the detector. The material above the slot shields the reception sur~ace ~rom direct radiation from the radiation source.
Especially suitable as a detector is a scintillation crystal or a semi-conductor, which do not require expensive cooling means such as is necessary in the semi-conductor crystals previously used.
The frusto-conical surfaces which de~ine the ~5 aperature, when extended beyond the points of the cone, suitably intersect the reception surface, so that no portion o~ the fluorescing radiation impinges on the borehole wall which lies opposite the reflec-ting surface, which, undesirably, can stimulate further development.
In the diagram, the single Figure is a side view of a probe, the left half of which is in section.
s The diagram shows an example o~ execution of a probe 1 in accordance with the invention, partially cut away axially and partially cut axially, so that, in the cut area, a wall 2 oF a drill hole 3 is indicated. The probe has a housing 4, in the internal space of which, coaxially to the housing9 a radioactive source of irradiation 5 is located, the irradiation of which passes through a slot 6 to the outside, which slot is formed between two aperture parts 7,8. The radiation limited to the slot 6 en-ters into the drill hole 3 through a wall portion 9 of the hou~sing 4, and irradiates a wall area of the wall 2 of the drill hole 3 which lies between two points 10,11, and exhibits the -form of a ring 12. This area of the drill hole wall is stimulated for fluorescence, according to the ores found in this area, and this fluorescent irradiation proceeds through a wall part 15 lying between two projections 13,14 aligned inwardly to the reception surface 16 of a detector 17, which can be a scintillation detector or a semi-conductor ~0 detector. The fluorescence signal is transformed into an intelligence signal electrically dependent on it.
The aperture part 7 has an external surface 18 clirected to the reception surface 16 of the detector 17, which surface is conical, and the extension of which, on the outside, meets approximately at point 11, that is, the approximate boundary of the irradiated ring 12 of the wall
2 of the drill hole 3, which is axially deflected to the reception sur~ace 16. Because of the conical form, the fluorescent irradiation from the area of the ring 12 can reach9 substantially unimpaired, the entire reception surface 16 of the detector 17. The course of the ~ ~23~
radiation of the source of irradiation 5 and of the fluorescent irradia-tion of the ring 12 is indicated by the thin dotted line.
The housing 4 is closed at the bottom by means of a housiny part 19, only indica-ted, that is screwed into the internal screw thread 20. In the same way, the housing is closed at the top by means of a housiny part 21, which i.s screwed onto an external screw thread 22.
A coaxial cable extends out of the probe 1 to a feeding device, by means of which the probe 1 can be moved into the drill hole 3 in a way that can be precisely determined. The current supply and transmission of the intelligence signal from the detector 17 to a plotting circuit (not shown), which is located outside of the drill hole, takes place by means of the coaxial cable.
~ lthough various preferred embodiments of the present invention have been described herein in detail, it will be appreciated by those skilled in the art, that variations may be made thereto without departing from the spirit of the invention or the scope of the appended claims.
radiation of the source of irradiation 5 and of the fluorescent irradia-tion of the ring 12 is indicated by the thin dotted line.
The housing 4 is closed at the bottom by means of a housiny part 19, only indica-ted, that is screwed into the internal screw thread 20. In the same way, the housing is closed at the top by means of a housiny part 21, which i.s screwed onto an external screw thread 22.
A coaxial cable extends out of the probe 1 to a feeding device, by means of which the probe 1 can be moved into the drill hole 3 in a way that can be precisely determined. The current supply and transmission of the intelligence signal from the detector 17 to a plotting circuit (not shown), which is located outside of the drill hole, takes place by means of the coaxial cable.
~ lthough various preferred embodiments of the present invention have been described herein in detail, it will be appreciated by those skilled in the art, that variations may be made thereto without departing from the spirit of the invention or the scope of the appended claims.
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A probe for insertion into drill holes for locating mineral deposits, comprising, in combination, a cylindrical housing;
a radioactive radiation source within said housing;
a disc-shaped annular slot means surrounding said source lying in a plane perpendicular to the axis of the probe for concentrating rays from the source on a limited ring area of the drill hole wall when the probe is in the drill hole;
a radiation detector means for detecting fluorescent radiation resulting from stimulation by said rays, said detector means being spaced from said slot and having a reception surface turned toward the radiation source; and an annular aperture between said slot means and said detector means defined by a first wall lying on a frusto-conical surface coaxial with the probe and a second wall lying on a frusto-conical surface, said aperture gradually widening in the direction of said detector means, said aperture being positioned such that fluorescent radiation stimulated by said rays and reflected from said limited ring area is directed to said reception surface.
a radioactive radiation source within said housing;
a disc-shaped annular slot means surrounding said source lying in a plane perpendicular to the axis of the probe for concentrating rays from the source on a limited ring area of the drill hole wall when the probe is in the drill hole;
a radiation detector means for detecting fluorescent radiation resulting from stimulation by said rays, said detector means being spaced from said slot and having a reception surface turned toward the radiation source; and an annular aperture between said slot means and said detector means defined by a first wall lying on a frusto-conical surface coaxial with the probe and a second wall lying on a frusto-conical surface, said aperture gradually widening in the direction of said detector means, said aperture being positioned such that fluorescent radiation stimulated by said rays and reflected from said limited ring area is directed to said reception surface.
2. The probe of claim 1 in which axial extensions of said frusto-conical surfaces intersect the wall of said drill hole at the extremities of said limited ring area.
3. The probe of claim 2 in which said aperture lies immediately adjacent said slot means such that the axial distance between the detector means and the radiation source is minimized.
4. The probe of claims 1, 2 or 3 in which said reception surface is perpendicular to the axis of said probe.
5. The probe of claims 1, 2 or 3 in which the portion of the housing wall in the area of the extension of said slot means is made of beryllium.
6. The probe of claims 1, 2 or 3 in which said detector means is a scintillation crystal or a semi-conductor detector.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3312883A DE3312883C1 (en) | 1983-04-11 | 1983-04-11 | Probe for insertion into boreholes for the purpose of exploring ore deposits |
| DEP3312883.9 | 1983-04-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1223675A true CA1223675A (en) | 1987-06-30 |
Family
ID=6195920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000451658A Expired CA1223675A (en) | 1983-04-11 | 1984-04-10 | Probe for insertion into drill holes for the purpose of locating mineral deposits |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0124696B1 (en) |
| JP (1) | JPS59224587A (en) |
| AT (1) | ATE29312T1 (en) |
| AU (2) | AU562932B2 (en) |
| CA (1) | CA1223675A (en) |
| DD (1) | DD216505A5 (en) |
| DE (1) | DE3312883C1 (en) |
| FI (1) | FI82558C (en) |
| ZA (1) | ZA842668B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2414296A (en) * | 2004-05-17 | 2005-11-23 | Schlumberger Holdings | A well logging tool which has a radiation shield located between its body outer surface and its collar inner surface |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE718406C (en) * | 1938-12-03 | 1942-03-11 | Prospection Electr Procedes Sc | Method and device for the investigation of the layers penetrated by a borehole |
| US2578722A (en) * | 1950-05-18 | 1951-12-18 | United States Steel Corp | Apparatus for determining coating thickness |
| US2769918A (en) * | 1952-10-02 | 1956-11-06 | Gulf Research Development Co | Epithermal neutron logging method using collimation |
| US2830187A (en) * | 1954-01-22 | 1958-04-08 | Serge A Scherbatskoy | Radiation detector |
| US2909661A (en) * | 1954-09-02 | 1959-10-20 | Texaco Development Corp | Radioactivity borehole logging |
| US3163761A (en) * | 1962-10-29 | 1964-12-29 | Texaco Inc | Radiological well logging using neutron collimator to reduce the effect of well fluid on the log |
| FR1389417A (en) * | 1963-04-01 | 1965-02-19 | Commissariat Energie Atomique | Dosing method and devices by applying |
| US3371574A (en) * | 1963-07-31 | 1968-03-05 | Robert J. Dwyer | Oil detection device utilizing raman radiation |
| FR1387139A (en) * | 1963-11-29 | 1965-01-29 | Texaco Development Corp | Improvements in methods and devices for radioactive sounding coring |
| US3321627A (en) * | 1966-10-07 | 1967-05-23 | Schlumberger Ltd | Gamma-gamma well logging comprising a collimated source and detector |
| US3609366A (en) * | 1968-11-01 | 1971-09-28 | Schlumberger Technology Corp | Systems for neutron decay time well logging |
| DE1960508A1 (en) * | 1969-12-02 | 1971-06-09 | Osoboje K Bjuro Ministerstwa G | Radioisotope X-ray fluorescence analyzer for elemental analysis of rocks and ores under natural storage conditions |
| DE2347037C3 (en) * | 1973-09-19 | 1980-01-24 | Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe | Measurement system of a borehole probe |
| US4168428A (en) * | 1977-07-14 | 1979-09-18 | Dresser Industries, Inc. | Sync transmission method and apparatus for high frequency pulsed neutron spectral analysis systems |
-
1983
- 1983-04-11 DE DE3312883A patent/DE3312883C1/en not_active Expired
-
1984
- 1984-02-24 AT AT84101970T patent/ATE29312T1/en not_active IP Right Cessation
- 1984-02-24 EP EP84101970A patent/EP0124696B1/en not_active Expired
- 1984-04-06 JP JP59067840A patent/JPS59224587A/en active Pending
- 1984-04-09 DD DD84261783A patent/DD216505A5/en not_active IP Right Cessation
- 1984-04-09 AU AU26654/84A patent/AU562932B2/en not_active Ceased
- 1984-04-09 AU AU26651/84A patent/AU565798B2/en not_active Ceased
- 1984-04-09 FI FI841389A patent/FI82558C/en not_active IP Right Cessation
- 1984-04-10 CA CA000451658A patent/CA1223675A/en not_active Expired
- 1984-04-11 ZA ZA842668A patent/ZA842668B/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2414296A (en) * | 2004-05-17 | 2005-11-23 | Schlumberger Holdings | A well logging tool which has a radiation shield located between its body outer surface and its collar inner surface |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59224587A (en) | 1984-12-17 |
| AU562932B2 (en) | 1987-06-25 |
| FI841389A (en) | 1984-10-12 |
| DE3312883C1 (en) | 1984-08-02 |
| AU2665484A (en) | 1984-10-18 |
| AU2665184A (en) | 1984-10-18 |
| FI841389A0 (en) | 1984-04-09 |
| AU565798B2 (en) | 1987-10-01 |
| ATE29312T1 (en) | 1987-09-15 |
| DD216505A5 (en) | 1984-12-12 |
| EP0124696A1 (en) | 1984-11-14 |
| EP0124696B1 (en) | 1987-09-02 |
| ZA842668B (en) | 1984-12-24 |
| FI82558C (en) | 1991-03-11 |
| FI82558B (en) | 1990-11-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |