CN1047237C - Carbon/oxygen energy spectrum logging system - Google Patents
Carbon/oxygen energy spectrum logging system Download PDFInfo
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- CN1047237C CN1047237C CN93109244A CN93109244A CN1047237C CN 1047237 C CN1047237 C CN 1047237C CN 93109244 A CN93109244 A CN 93109244A CN 93109244 A CN93109244 A CN 93109244A CN 1047237 C CN1047237 C CN 1047237C
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- 238000001228 spectrum Methods 0.000 title claims abstract description 24
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 19
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 18
- 239000001301 oxygen Substances 0.000 title claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 17
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 title claims abstract 7
- 239000002245 particle Substances 0.000 claims abstract description 12
- 229910052722 tritium Inorganic materials 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 230000005251 gamma ray Effects 0.000 claims abstract description 5
- LBDSXVIYZYSRII-IGMARMGPSA-N alpha-particle Chemical group [4He+2] LBDSXVIYZYSRII-IGMARMGPSA-N 0.000 claims description 17
- 239000013078 crystal Substances 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 5
- 229910052721 tungsten Inorganic materials 0.000 claims description 5
- 239000010937 tungsten Substances 0.000 claims description 5
- 150000002500 ions Chemical class 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 11
- 238000001514 detection method Methods 0.000 abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 239000004568 cement Substances 0.000 description 8
- 229910016036 BaF 2 Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000002366 time-of-flight method Methods 0.000 description 5
- YZCKVEUIGOORGS-NJFSPNSNSA-N Tritium Chemical compound [3H] YZCKVEUIGOORGS-NJFSPNSNSA-N 0.000 description 4
- 239000003027 oil sand Substances 0.000 description 4
- 239000000523 sample Substances 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 230000000875 corresponding effect Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000004807 localization Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The present invention provides a high precision carbon/oxygen (C/O) ratio energy spectrum logging system which applies the flight time technology of accompanied alpha particles of fast neutrons in a deuterium-tritium reaction to C/O ratio energy spectrum logging. The logging system comprises a neutron tube provided with an accompanied alpha particle detection system, neutron shield pads, a gamma-ray detector, a fast electronics timing component and a data acquisition, processing and control computer. The logging system of the present invention can avoid the influence of non-orebed materials around the detector, depress various backgrounds and determine the oil content, the water content and other information of a measured stratum with high accuracy.
Description
The present invention relates to carbon/oxygen than (C/O) spectral log field.
Carbon/oxygen (C/O) is a kind of important method that is used for surveying oil reservoir, water layer, profit content and lithology in the cased well on low mineralization, high porosity (＞20%) stratum than the power spectrum well logging.One of its ultimate principle is: with the fast neutron bombardment ore bed of 14MeV, C in the ore bed and O emit 4.43 and the non-bullet feature gamma-rays of 6.13MeV respectively; Measure the ratio that gamma-ray power spectrum and intensity can obtain C content and O content in the ore bed.Many C in the oil, many O in the water can determine the oil well oil-containing situation of ore bed on every side by C/O ratio and other measurement data.
But, utilize the existing measured C/O ratio of well logging apparatus to have very big uncertainty.This is that non-ore bed materials such as the water that the 6cm that has an appointment is thick, iron, cement wherein contain a large amount of C, O, Si, Ca because (referring to accompanying drawing 1) in well logging apparatus, is close to the sensitive volume of scintillation probe.The about 20cm of ore bed actual measurement thickness that the cement sleeve pipe is outer.Approximate treatment shows that in total feature γ counting, the contribution of non-ore bed materials such as cement sleeve pipe accounts for about half, and their effect is equivalent to background, brings very big uncertainty will for C/O ratio.
Utilize the non-bullet gamma-rays of feature determine C/O than the time, capture gamma-rays and form background.Utilize " two-door method " or " three methods " deduction background also to introduce error inevitably.In addition, very strong Compton effect also is to produce the probabilistic key factor of C/O ratio.
Publication number is that an European patent of 0346260 (say open day Dec 27 in 1989) has been described a kind of purpose and is to revise C/O ratio well logging instrument and DATA REASONING and the disposal route that BHM is disturbed.The characteristics of this instrument are to be furnished with pulsed neutron generator, and one from the nearer flicker gamma detector of neutron generator, and one from neutron generator flicker gamma detector far away.The special shield that is provided with makes near gamma detector sensitive to the gamma-rays that BHM produces, and gamma detector far away is strengthened the gamma-rays sensitivity that the ore bed material produces, and the gamma-rays sensitivity that BHM is produced reduces.Under lab with this instrument on the simulation well that multiple different elements are formed, systematically carry out the non-bullet γ standard spectrum of two detectors in advance.With this standard spectrum is benchmark, and non-bullet γ spectrum that the analyses and comparison actual measurement is arrived can obtain the representative amount of the C and the O near and two measured zones of detector far away respectively.Two groups of representative amounts are combined can obtain well/ore bed substance sensitive matrix, and then has obtained revising the ore bed material oil saturation of BHM influence.
According to the detailed argumentation of this patent, about perhaps instrument and method can partly revise the influence of BHM, but its implementation process difficulty and complicated relatively.The one, related measuring amount is more, and each amount all has error; The 2nd, stratal configuration goes the inevitable drawing-in system error of compare of analysis measurement data in becoming ten thousand changes with limited standard spectrum; The 3rd, the data handling procedure more complicated will cause error accumulation.These combined factors are got up and will be made net result have bigger uncertainty.
In a word, in existing well logging apparatus, above-mentioned background is inevitable on measuring; Though reduce this influence with multiple measure, introducing bigger uncertainty also is inevitably, and brings very big complicacy.At the deficiency of above-mentioned technology, the present invention proposes a kind of α of following particle fast neutron flight time carbon/oxygen than power spectrum logging system, can force down background greatly, significantly improves the accuracy of the C/O ratio of surveying.
The present invention---carbon-to-oxygen ratio spectrum logging system, it includes the neutron tube that produces neutron, measure the gamma-ray gamma detector of direct non-bullet that neutron brought out, be in the neutron shield body between described neutron tube and the gamma detector, the linear electronics parts that link with gamma detector, be the high pressure and the low-tension supply of the power supply of neutron tube and electronics component, and high pressure resistant sealing steel shell with obtain with the ground data that described linear electronics parts are connected by cable, processing and control computer; It is characterized in that said neutron tube has α particle signal deriving means, also include the Fast Electronics timing part that is connected with the fast signal output terminal coupling of described α particle signal deriving means and gamma detector.Above-mentioned deuterium-tritium reaction neutron tube constitutes one with following the alpha signal deriving means; Above-mentioned α particle signal deriving means can be made of around the incident ion bundle in the deuterium-tritium reaction a plurality of alpha particle detectors, and wherein each alpha particle detector is by inorganic scintillator.Photoconduction and fast photomultiplier constitute; Above-mentioned Fast Electronics timing part can be by fast constant proportion timer, time to amplitude converter, and the single-channel analyzer sequential combination forms; Said neutron shield body is made up of along neutron exit direction series arrangement copper coin cone, tungsten right cylinder and plumbous Rotary-table; Above-mentioned gamma detector can be made of the inorganic scintillator of measuring energy of and fast photomultiplier.
Utilize system of the present invention, under the measuring well during direct non-bullet gamma-rays power spectrum, the signal background ratio of carbon/oxygen ratio exceeds 5-10 doubly than existing similar device, the carbon/oxygen ratio of the saturated oil-sand of surveying and saturation water sand a little more than 0.3, change relatively greater than 18%, therefore when definite ore bed oil-containing, moisture information, has quite high accuracy.
Accompanying drawing and brief description of drawings
Fig. 1 is that carbon/oxygen is than power spectrum well logging apparatus synoptic diagram
1. neutron tube high-voltage power supply
2. band is followed the neutron tube of α particle signal deriving means
3. annular is followed the alpha-particle detection device
4. deuterium-tritium reaction target head
5. related neutron streaming
6. copper shield body
7. tungsten shield
8. lead shield body
9.BaF, crystal
10. fast photomultiplier
11. Fast Electronics timing part
12. linear electronics parts
13. cable
14. data are obtained, processing and control computer and ground power supply
15. sniffer steel can
16. steel well casing
17. cement sleeve pipe
18. the ore bed around the cement sleeve pipe
19. be in the fraction cement sheath in the related neutron beam
20. the fluid in the mine
21. time to amplitude converter
22. single-channel analyzer
23. linear gate
Introduce an embodiment below in conjunction with accompanying drawing 1:
The ultimate principle of institute of the present invention foundation is:
1. exist
3He (d, n)
4He (perhaps is written as in T (d, n) α) reaction outgoing neutron and recoil α particle
Be subjected to the restriction of reaction kinetics, they are outgoing in opposite direction point-blank almost.
2. the direct non-bullet feature gamma-rays of inducting in the neutron that is associated or they and the detection of α particle
Signal is correlated with in time, and the geometric position that the mistiming between them inducts along with γ is not
Change together.
Referring to Fig. 1, specify as follows.
1. the effective ore bed of localized measurement zone.
In Fig. 1, the right-hand of tritium target 4 is alpha detection device 3, and the neutron beam 5 that is associated with α is between ray TA and TB and ray TA ' and TB '.The geometric position of appropriate adjustment means can make near scintillation probe (BaF
2Crystal) 9 the non-ore bed material overwhelming majority is in outside the related neutron beam.Though be mapped to gamma-rays that the dereferenced neutron on the non-ore bed material produces also can be in scintillation probe priming signal, do not have corresponding alpha signal generation and meet numeration.So just the γ signal that non-ore bed material such as the cement that is in internal layer, water is produced has weeded out.This effect can be referred to as associated particle TOF method " localization function ".
2. remove the influence in non-ore bed zone
Now neutron n of supposition sends from tritium target 4 on the center point P that is mapped to the ore bed material, injects the scintillation detector 9, and the generation signal this process t that takes time altogether from the direct non-bullet gamma-rays that this point produces
nBe detected device 3 with the corresponding α of n and detect, and produce signal, need time t
aIn the fixed signal transmitting device, the mistiming t between two signals
n-t
aTo be a statistics determined value t
pIt is contemplated that in related neutron beam, neutron produces the application point difference of direct non-bullet γ, then the mistiming is just different.The flying speed of neutron than gamma-rays slowly many, therefore in general, more near tritium target 4, the mistiming is littler for application point; Application point is bigger from the big more then mistiming of tritium target 4.Utilize the time of flight arrangement can record one with t
pFlight time difference spectrum for the center.In the zone around the P point about 10cm, the mistiming of generation is at t
pIn ± 4ns the scope.Signal in selected this mistiming scope is as useful signal, and then the gamma-rays of the non-ore bed material generation on camber line RR ' the right does not produce actual count.So just the γ signal that the non-ore bed materials such as cement around copper, the tungsten shield 6,7 are produced has excluded, and is referred to as " timing function " of associated particle TOF method.
3. remove the direct puncture neutron and disturb, improve efficiency of measurement
Near 0 degree outgoing neutron though stop through shield, still has the part neutron directly to inject scintillator, and corresponding recoil α is not received by alpha detection device 3 180 ° of left and right sides outgoing.Experience shows that associated particle TOF method " localization effect " can reduce about magnitude of background of direct puncture neutron generation.This effect is used in shielding scintillation probe BaF again
2The neutron shield body 6,7,8 of crystal 9 might be shortened, thereby improves the neutron flux of injecting ore bed, significantly improves detection efficiency.
4. time-of-flight method is forced down and is captured the gamma-rays background
In existing pulsed neutron method measurement mechanism, the time width of counting door or background gate is in the scope of 10-20 μ s.Capture γ in time by the index law decay, adopt subtractive method to introduce error inevitably.In the present invention, counting is to carry out in the time gate of 10ns magnitude, and slow neutron and the generation of capturing γ thereof are the incidents of μ s magnitude, therefore on the whole, can not produce inevitable coincidence counting with alpha signal, can only form the accidental numeration that meets.
5.BaF
2The signal of crystal 9 has speed two compositions.The existence of fast component makes and utilizes the fast neutron time-of-flight method to be achieved.BaF
2The thermal capture section of crystal 9 than the little magnitude of NaI about, help forcing down thermal capture gamma-rays background.Custom-designed neutron shield body 6,7,8 helps improving ore bed district neutron intensity and reduces the direct puncture background.
In sum, adopt and follow α particle fast neutron flying time technology, can select effective ore bed zone to measure, force down all kinds of backgrounds greatly, add other innovative approach, thereby significantly improve the accuracy of the C/O ratio of surveying.
Neutron tube high-voltage power supply 1 is followed neutron tube 2 power supplies of α particle signal deriving means for band, accelerating potential is 120KV, annular follows alpha-particle detection device 3 to be made of around incident ion bundle in the neutron tube a plurality of alpha particle detectors, utilize the ZnS scintillator to survey the α particle, the fast photomultiplier output rise time is the fast signal of ns magnitude, send into Fast Electronics timing part 11, deuterium-tritium reaction target head 4 utilizes
3He (d, n) the 4He reaction produces the 14Mev neutron, produce the related neutron streaming 5 of certain limit for the given alpha-particle detection device of following, ore bed 18 around these neutron streaming 5 directive gamma detectors, interact with the multiclass element in the ore bed, produce the direct non-bullet gamma-rays that is associated with α.Copper shield body 6 is taper, and tungsten shield 7 is the garden cylindricality, and lead shield body 8 is garden platform shape.Three's combination can shield the direct puncture neutron and relevant gamma-rays that incides on the gamma detector effectively.
Gamma detector is by BaF
2Crystal 9 and fast photomultiplier 10 constitute, fast photomultiplier output energy linearity signal and fast signal, linear signal by linear electronics system 12 and cable 13 send into that ground data are obtained, processing and control computer 14, fast signal is sent into Fast Electronics timing part 11.Said Fast Electronics timing part 11 is pressed functional sequence by fast amplifier, fast constant proportion timer, and time to amplitude converter, single-channel analyzer constitutes.From BaF
2The γ signal as enabling signal, from the alpha signal of alpha detection device for closing gate signal.The neutron and the gamma-ray time of flight spectrum of inducting are the approximate Gaussian type and distribute, overall width is about 12ns, utilize single-channel analyzer to choose the enabling signal of the interior signal of particular flight time range as the gamma-rays gate circuit in the linear electronics system 12, the gamma spectrum that measures thus has very high signal background ratio.Comprise linear amplifier, linear gate in the linear electronics parts 12, low-tension supply, the effective high-voltage power supply of photomultiplier transit.
Whole sniffer is enclosed in the airtight steel can 15, when measuring, put it in the mine, by polycore cable 13 be in that ground data are obtained, processing is connected with control computer 14.
Measuring process and interpretation of result.
Measure at present and carry out in two kinds of wells, one is the oil-sand well, and one is the water sand drain.
Measurement mechanism is put into before the well, at first utilize Am-Be neutron source to carry out energy calibration, choosing the carbon window is 3.17-4.65Mev, the oxygen window is 4.86-6.34Mev, after measurement mechanism puts in place at first unlocking electronic learn system, slowly start neutron tube then, selected flight time gate-width is 8ns, the tale and the gamma spectrum of α particle followed in record simultaneously, and the statistical error that keeps tale under carbon window and the oxygen window is less than 1%.One group of typical measurement data is as follows:
| Nα(10 8) | Nc | ?No | ?C/O | Δ(C/O) | Re | |
| The oil-sand well | 11.008 | 84290 | ?45712 | ?1.844 | ?0.313 | 18.5％ |
| The water sand drain | 11.003 | 86273 | ?56333 | ?1.531 |
N α represents to follow α particle tale in the last table; Nc and No represent the tale of γ under C window and the O window respectively; C/O represents carbon-oxygen ratio, and it is poor that the C/O of Δ (C/O) expression oil-sand well and water sand drain compares, and Re represents the number percent of two kinds of well C/O than difference and mean value, and this result has reacted the C/O ratio of these two kinds of wells quite truly.To different lithology, factor of porosity, oil length give carries out calibration curve earlier, and then the C/O that records of said apparatus is than resolution ability height, thereby determines the oil-containing of down-hole ore bed, moisture information with higher degree of confidence.
Claims (6)
1, a kind of carbon-to-oxygen ratio spectrum logging system, it includes the neutron tube that produces neutron, measure the gamma-ray gamma detector of direct non-bullet that neutron brought out, be in the neutron shield body between described neutron tube and the gamma detector, the linear electronics parts that link with gamma detector, be the high pressure and the low-tension supply of the power supply of neutron tube and electronics component, and high pressure resistant sealing steel shell with obtain with the ground data that described linear electronics parts are connected by cable, processing and control computer; It is characterized in that said neutron tube has α particle signal deriving means, also include the Fast Electronics timing part that connects with described α particle signal deriving means and the fast signal output terminal coupling of gamma detector.
2, carbon/oxygen of putting down in writing according to claim 1 is characterized in that than power spectrum logging system, and said neutron tube is to constitute one with following α particle signal deriving means.
3, according to claim 1 or 2 carbon/oxygen of being put down in writing than power spectrum logging system, it is characterized in that, the said α of following particle signal deriving means is by a plurality of alpha particle detectors, constitute around the incident ion bundle in the deuterium-tritium reaction, each alpha particle detector is made of inorganic scintillator and photomultiplier.
4, according to claim 1,2 carbon/oxygen of being put down in writing than power spectrum logging system, it is characterized in that said gamma detector by BaF, crystal and fast photomultiplier constitute.
5, according to claim 1,2 carbon/oxygen of being put down in writing than power spectrum logging system, it is characterized in that said neutron shield body, form along neutron exit direction series arrangement by copper coin centrum, tungsten right cylinder and plumbous Rotary-table.
6, according to claim 1,2 carbon/oxygen of being put down in writing than power spectrum logging system, it is characterized in that said Fast Electronics timing part by following device, connect in the following order and form: fast constant proportion timer, time to amplitude converter and single-channel analyzer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93109244A CN1047237C (en) | 1993-08-09 | 1993-08-09 | Carbon/oxygen energy spectrum logging system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93109244A CN1047237C (en) | 1993-08-09 | 1993-08-09 | Carbon/oxygen energy spectrum logging system |
Publications (2)
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|---|---|
| CN1098763A CN1098763A (en) | 1995-02-15 |
| CN1047237C true CN1047237C (en) | 1999-12-08 |
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| CN93109244A Expired - Fee Related CN1047237C (en) | 1993-08-09 | 1993-08-09 | Carbon/oxygen energy spectrum logging system |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053763C (en) * | 1998-01-23 | 2000-06-21 | 清华大学 | Adjoint alpha neutron tube for logging |
| RU2199136C2 (en) | 1998-01-23 | 2003-02-20 | Циньхуа Юниверсити | Neutron generator in sealed tube containing built-in detector of bound alpha particles for hole logging |
| US7728306B2 (en) * | 2007-10-26 | 2010-06-01 | Schlumberger Technology Corporation | Neutron logging tool having source and target with deuterium-tritium gas admixture |
| US7634059B2 (en) * | 2007-12-05 | 2009-12-15 | Schlumberger Technology Corporation | Downhole imaging tool utilizing x-ray generator |
| CN102084271B (en) * | 2008-06-25 | 2013-11-06 | 普拉德研究及开发股份有限公司 | Absolute elemental concentrations from nuclear spectroscopy |
| CN101749014B (en) * | 2009-12-22 | 2013-07-03 | 中国石油化工股份有限公司 | Simulated formation testing device for carbon-to-oxygen ratio spectrum logging and application method |
| CN101737032B (en) * | 2010-01-04 | 2013-01-02 | 大庆石油管理局 | Gamma ray detector in carbon/oxygen spectral logging system with alpha particles |
| CN105467467A (en) * | 2015-12-23 | 2016-04-06 | 西京学院 | Manufacture technology of standard module used for carbon-dioxide ratio energy spectrum well |
| CN105673006B (en) * | 2016-01-07 | 2018-12-14 | 中国石油大学(华东) | It is a kind of for determining the carbon-to-oxygen ratio value calculating method of remaining oil saturation |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0348260A1 (en) * | 1988-06-07 | 1989-12-27 | Schlumberger Limited | Carbon/oxygen well logging method and apparatus |
| US5180917A (en) * | 1991-08-08 | 1993-01-19 | Schlumberger Technology Corporation | Self-calibrating proportional counter |
| US5406078A (en) * | 1992-05-28 | 1995-04-11 | Halliburton Logging Services, Inc. | Induced gamma ray spectorscopy well logging system |
-
1993
- 1993-08-09 CN CN93109244A patent/CN1047237C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0348260A1 (en) * | 1988-06-07 | 1989-12-27 | Schlumberger Limited | Carbon/oxygen well logging method and apparatus |
| US5180917A (en) * | 1991-08-08 | 1993-01-19 | Schlumberger Technology Corporation | Self-calibrating proportional counter |
| US5406078A (en) * | 1992-05-28 | 1995-04-11 | Halliburton Logging Services, Inc. | Induced gamma ray spectorscopy well logging system |
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| CN1098763A (en) | 1995-02-15 |
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