CN2704053Y - Pulse neutron well logging instrument for four neutron-neutron detector - Google Patents
Pulse neutron well logging instrument for four neutron-neutron detector Download PDFInfo
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- CN2704053Y CN2704053Y CN 200420050988 CN200420050988U CN2704053Y CN 2704053 Y CN2704053 Y CN 2704053Y CN 200420050988 CN200420050988 CN 200420050988 CN 200420050988 U CN200420050988 U CN 200420050988U CN 2704053 Y CN2704053 Y CN 2704053Y
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Abstract
The utility model discloses a pulse neutron well logging instrument for four neutron-neutron detector which is applied to the technical field of field geophysics, mainly solving the insufficient that only two sets of logging data and lesser information quantity can obtained one time by the existing pulse neutron well logging instrument for neutron detector. The utility model is characterized in that the pulse neutron generator (8) is an underwell pulse neutron generator with small diameter, and the thermal neutron detector unit is composed of an upper end near source spacing thermal neutron detector (2), an upper end far source spacing thermal neutron detector (3), a lower end near source spacing thermal neutron detector (13) and a lower end far source spacing thermal neutron detector(14) four thermal neutron detectors. The utility model has the advantages that four sets of logging data of the stratum materials can be obtained one time by the pulse neutron well logging instrument for four neutron-neutron detector, the information quantity is big, the scintillation error of the radioactivity statistic is small, the reliability of log curve is enhanced, and the measurement precision of the instrument is improved.
Description
Technical field:
The utility model relates to a kind of logging instrumentation that is applied in the field geophysics field, specifically, relates to a kind of four neutrons that utilize neutron and the interactional principle of formation material to log well-neutron detector pulsed neutron log instrument.
Background technology:
The Neutron Detector well logger is mainly used in the formation parameter neutron well logging.Pulsed neutron log mainly reflects the various constituent contents on stratum, on the porosity stratum, it can determine oil saturation, water saturation, the factor of porosity on stratum indirectly, when using with other logging method analysis-by-synthesis, the pulsed neutron log data can also help to determine formation parameters such as lithology, clay content.At present, two neutrons-neutron detector pulsed neutron log instrument has abroad been arranged, in the logging technology field, this kind two neutrons-neutron detector pulsed neutron log instrument is called the PNN well logger for short, it is mainly used in thermal neutron lifetime and the macroscopic capture cross section of measuring the stratum in uncased hole and cased well, then tries to achieve the stratum water saturation and then obtains the stratum oil saturation.The primary structure characteristics of this PNN well logger are to place two thermal neutron detectors in the lower end of the conventional pulse electronic generator with neutron tube, and one is nearly spacing detector, and one is spacing detector far away.The problem of using this logging instrumentation to log well to exist is: this kind logging instrumentation is once gone into the well can only obtain two groups of formation material log datas, quantity of information is less; In addition, it does not generally repeat whole measuring well section, so radioactivity statistical fluctuation error is big, and measuring accuracy is relatively low.
The utility model content:
Once go into the well and to obtain two groups of formation material log datas, the less deficiency of quantity of information in order to overcome existing two neutrons-neutron detector pulsed neutron log instrument, the utility model provides a kind of four neutrons-neutron detector pulsed neutron log instrument, and this kind four neutrons-neutron detector pulsed neutron log instrument has once the go into the well repeatability that can obtain four groups of formation material log datas, contain much information and can reduce radioactivity statistical fluctuation error, strengthen logging trace, the characteristics that improved the measuring accuracy of instrument.
The technical solution of the utility model is: this kind four neutrons-neutron detector pulsed neutron log instrument, comprise pulsed neutron generator, the thermal neutron detector unit, pulse signal control module and thermal neutron detector input and transmission unit, wherein said pulsed neutron generator is a minor diameter down-hole pulsed neutron generator, described thermal neutron detector unit is made of four thermal neutron detectors, it is respectively the nearly spacing thermal neutron detector in upper end, upper end spacing thermal neutron detector far away, the nearly spacing thermal neutron detector in lower end, lower end spacing thermal neutron detector far away, nearly spacing thermal neutron detector wherein, upper end spacing thermal neutron detector far away is fixed in the upper end of pulsed neutron generator, the nearly spacing thermal neutron detector in lower end in turn, lower end spacing thermal neutron detector far away is fixed in the lower end of pulsed neutron generator in turn.
Pulse signal control module and thermal neutron detector input and transmission unit are employed universal design scheme in the conventional pulsed neutron log instrument.
The utlity model has following beneficial effect: owing to take the four neutrons-neutron detector pulsed neutron log instrument of such scheme to replace conventional major diameter pulsed neutron generator of the prior art to make the effective working space in the well logger be released with minor diameter down-hole pulsed neutron generator, and then make and can respectively place two thermal neutron detectors at the two ends of pulsed neutron generator; Owing at the two ends of pulsed neutron generator two thermal neutron detectors are arranged respectively in the technical program, so once go into the well and to obtain the well logging information of four groups of formation material, making it the quantity of information that more original two neutrons-neutron detector pulsed neutron log instrument is obtained has increased by one times, has reduced radioactivity statistical fluctuation error; In addition, four groups of log data curves can confirm mutually, have strengthened the repeatability and the reliability of logging trace, make that finally the measuring accuracy of neutron detector well logger is improved greatly.
Description of drawings:
Accompanying drawing 1 is a structure cut-open view of the present utility model.
1-thermal neutron detector fixed mount among the figure, the nearly spacing thermal neutron detector in 2-upper end, 3-upper end spacing thermal neutron detector far away, 4-polyamides argon ammonia seal plug, 5-pressure block, 6-viton seal ring, the 7-sealing-plug that goes between, the 8-pulsed neutron generator, 9-High-Voltage Insulation pipe, 10-pressure-bearing thin walled tube, the polyamides argon ammonia seal plug of 11-band charging connector, 12-automobile tyre inflation mouth, the nearly spacing thermal neutron detector in 13-lower end, 14-lower end spacing thermal neutron detector far away.
Embodiment:
The utility model is described in further detail below in conjunction with accompanying drawing:
As shown in Figure 1, this kind four neutrons-neutron detector pulsed neutron log instrument, mainly comprise pulsed neutron generator 8, thermal neutron detector unit, pulse signal control module and thermal neutron detector input and transmission unit, wherein pulse signal control module and thermal neutron detector input and transmission unit adopt the employed similar circuit board with identical principle of work of PNN well logger, have just increased the circuit kit plate more and have used for two thermal neutron detectors that increase.
The special character of this kind of four neutrons-neutron detector pulsed neutron log instrument is that described pulsed neutron generator 8 is minor diameter down-hole pulsed neutron generator, promptly by minor diameter down-hole pulsed neutron generator that No. 01277392.1 patent provided, than the PNN well logger, this kind of well logger has replaced conventional major diameter pulsed neutron generator of the prior art to make the effective working space in the well logger be released with minor diameter down-hole pulsed neutron generator, and then makes and can respectively place two thermal neutron detectors at the two ends of pulsed neutron generator.
Thermal neutron detector unit mentioned above is made of four thermal neutron detectors, it is respectively the nearly spacing thermal neutron detector 2 in upper end, upper end spacing thermal neutron detector 3 far away, the nearly spacing thermal neutron detector 13 in lower end, lower end spacing thermal neutron detector 14 far away, nearly spacing thermal neutron detector 2 wherein, upper end spacing thermal neutron detector 3 far away is fixed in the upper end of pulsed neutron generator 8 successively, the nearly spacing thermal neutron detector 13 in lower end, lower end spacing thermal neutron detector 14 far away is fixed in the lower end of pulsed neutron generator 8 successively, on the so-called here pulsed neutron generator 8, the lower end promptly is that close neutron tube titanium tritium target end is called the lower end and will be called the upper end from a neutron tube titanium tritium target end end far away.
Since thermal neutron detector must be in the certain scope of distance neutron source can operate as normal, through repeatedly experimental results show that, can draw spacing value range preferable in the technical program, promptly the spacing scope of the neutron tube titanium tritium target in nearly spacing thermal neutron detector 2 in upper end and the pulsed neutron generator 8 is 27 centimetres to 57 centimetres, the spacing scope of the neutron tube titanium tritium target in upper end spacing thermal neutron detector 3 far away and the pulsed neutron generator 8 is 47 centimetres to 77 centimetres, the spacing scope of the neutron tube titanium tritium target in nearly spacing thermal neutron detector 13 in lower end and the pulsed neutron generator 8 is 27 centimetres to 57 centimetres, and the spacing of the neutron tube titanium tritium target in lower end spacing thermal neutron detector 14 far away and the pulsed neutron generator 8 is 47 centimetres to 77 centimetres for the spacing scope.
In the technical program, thermal neutron detector can be selected He for use
3Counter tube also can be selected the lithium glass scintillation detector for use, but the latter is minimum to the reaction of gamma rays, therefore should be first-selection.The inside of minor diameter pulsed neutron generator will be full of the sulfur hexafluoride insulating gas, its two ends are separately installed with the polyamides argon ammonia seal plug 11 of polyamides argon ammonia seal plug 4, band charging connector, these two seal plugs adopt the purpose of polyamides argon ammonia to be with polyamides argon ammonia as neutron moderator, are shone directly on the thermal neutron detector by the neutron that neutron tube titanium tritium target is launched preventing.
During actual installation, thermal neutron detector is fixed on as shown in FIG. the thermal neutron detector fixed mount 1, pressure block 5 is fixed in the polyamides argon ammonia seal plug 11 of polyamides argon ammonia seal plug 4, band charging connector on the pressure-bearing thin walled tube 10 respectively by the M3 screw, and pressure-bearing thin walled tube 10 will select to bear 10 to 20 atmospheric tubing.On the polyamides argon ammonia seal plug 11 of polyamides argon ammonia seal plug 4, band charging connector and go between sealing-plug 7, automobile tyre inflation mouth 12 viton seal ring 6 is installed all, this kind viton seal ring can tolerate 150 degrees centigrade high temperature.Four electric power conductors on neutron tube ion gun anode in the minor diameter pulsed neutron generator, negative electrode, the filament are drawn by lead-in wire sealing-plug 7, on neutron tube ion gun anode, add 2400 deep-sited pulses towards voltage, plus earth, after filament adds an amount of voltage, emit an amount of deuterium gas, 2400 volts of voltages of anode are ionized into negative ions to deuterium gas, its target adds 120 kilovolts of high pressure on extremely, make the generation deuterium-tritium reaction, radiate the fast neutron of 14.1Mev, the effect of High-Voltage Insulation pipe 9 is to guarantee the High-Voltage Insulation of whole logging instrumentation.120 kilovolts of Cockcroft-Walton accelerator transformer leads and dupler ground wire are drawn by the sealing wire plug on the polyamides argon ammonia seal plug 11 of band charging connector, and the effect of the automobile tyre inflation mouth 12 on this polyamides argon ammonia seal plug 11 is that the sulfur hexafluoride insulating gas of centering electronic generator inside charges and discharge.
Utilize this kind four neutrons-when neutron detector pulsed neutron log instrument is logged well, by logging cable this instrument is transferred to the shaft bottom, logging winch is to carry this instrument on 120 meters/hour the even speed, then demonstrate four groups of detectors-neutron time spectrum on the display screen on the surface laboratory, per 0.8 second of subsurface equipment is the transmission primaries data upwards, neutron-time spectrum by four groups of detectors, can handle according to default calculation procedure, so operation, instrument is once gone into the well and can be obtained the well logging information of four groups of formation material by four thermal neutron detectors, making it the quantity of information that more original two neutrons-neutron detector pulsed neutron log instrument is obtained has increased by one times, has reduced radioactivity statistical fluctuation error; In addition, these four groups of log data curves can confirm mutually, have strengthened the repeatability and the reliability of logging trace, make that finally the measuring accuracy of neutron detector well logger is improved greatly.
Claims (2)
1, a kind of four neutrons-neutron detector pulsed neutron log instrument, comprise pulsed neutron generator (8), the thermal neutron detector unit, pulse signal control module and thermal neutron detector input and transmission unit, it is characterized in that: described pulsed neutron generator (8) is a minor diameter down-hole pulsed neutron generator, described thermal neutron detector unit is made of four thermal neutron detectors, it is respectively the nearly spacing thermal neutron detector (2) in upper end, upper end spacing thermal neutron detector (3) far away, the nearly spacing thermal neutron detector in lower end (13), lower end spacing thermal neutron detector far away (14), nearly spacing thermal neutron detector (2) wherein, upper end spacing thermal neutron detector (3) far away is fixed in the upper end of pulsed neutron generator (8), the nearly spacing thermal neutron detector in lower end (13) in turn, lower end spacing thermal neutron detector far away (14) is fixed in the lower end of pulsed neutron generator (8) in turn.
2, a kind of four neutrons according to claim 1-neutron detector pulsed neutron log instrument, it is characterized in that: the spacing scope of the neutron tube titanium tritium target in nearly spacing thermal neutron detector in upper end (2) and the pulsed neutron generator (8) is 27 centimetres to 57 centimetres, the spacing scope of the neutron tube titanium tritium target in upper end spacing thermal neutron detector (3) far away and the pulsed neutron generator (8) is 47 centimetres to 77 centimetres, the spacing scope of the neutron tube titanium tritium target in nearly spacing thermal neutron detector in lower end (13) and the pulsed neutron generator (8) is 27 centimetres to 57 centimetres, and the spacing scope of the neutron tube titanium tritium target in lower end spacing thermal neutron detector far away (14) and the pulsed neutron generator (8) is 47 centimetres to 77 centimetres.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420050988 CN2704053Y (en) | 2004-05-17 | 2004-05-17 | Pulse neutron well logging instrument for four neutron-neutron detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420050988 CN2704053Y (en) | 2004-05-17 | 2004-05-17 | Pulse neutron well logging instrument for four neutron-neutron detector |
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| Publication Number | Publication Date |
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| CN2704053Y true CN2704053Y (en) | 2005-06-08 |
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| CN 200420050988 Expired - Fee Related CN2704053Y (en) | 2004-05-17 | 2004-05-17 | Pulse neutron well logging instrument for four neutron-neutron detector |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101418684A (en) * | 2007-10-25 | 2009-04-29 | 普拉德研究及开发股份有限公司 | Tritium-tritium neutron generator logging tool |
| CN100497885C (en) * | 2006-05-24 | 2009-06-10 | 中国石化集团胜利石油管理局钻井工艺研究院 | Deuterium-deuterium controllable compensating neutron well logging instrument during drilling |
| CN102692654A (en) * | 2012-05-28 | 2012-09-26 | 中国石油大学(华东) | Pulse neutron well logging method and equipment for tight gas reservoir evaluation |
| CN105510986A (en) * | 2015-12-30 | 2016-04-20 | 中国石油天然气股份有限公司 | Method and device for determining content of glauconite in glauconite sandstone |
-
2004
- 2004-05-17 CN CN 200420050988 patent/CN2704053Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100497885C (en) * | 2006-05-24 | 2009-06-10 | 中国石化集团胜利石油管理局钻井工艺研究院 | Deuterium-deuterium controllable compensating neutron well logging instrument during drilling |
| CN101418684A (en) * | 2007-10-25 | 2009-04-29 | 普拉德研究及开发股份有限公司 | Tritium-tritium neutron generator logging tool |
| CN102692654A (en) * | 2012-05-28 | 2012-09-26 | 中国石油大学(华东) | Pulse neutron well logging method and equipment for tight gas reservoir evaluation |
| CN102692654B (en) * | 2012-05-28 | 2014-06-04 | 中国石油大学(华东) | Pulse neutron well logging method and equipment for tight gas reservoir evaluation |
| CN105510986A (en) * | 2015-12-30 | 2016-04-20 | 中国石油天然气股份有限公司 | Method and device for determining content of glauconite in glauconite sandstone |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |