CN102996118B - Sound wave logging instrument with sound insulation function - Google Patents
Sound wave logging instrument with sound insulation function Download PDFInfo
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- CN102996118B CN102996118B CN201210559701.XA CN201210559701A CN102996118B CN 102996118 B CN102996118 B CN 102996118B CN 201210559701 A CN201210559701 A CN 201210559701A CN 102996118 B CN102996118 B CN 102996118B
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- 238000009413 insulation Methods 0.000 title claims abstract description 41
- 239000000523 sample Substances 0.000 claims abstract description 71
- 229920006351 engineering plastic Polymers 0.000 claims description 76
- 238000010521 absorption reaction Methods 0.000 claims description 74
- 239000010410 layer Substances 0.000 claims description 41
- 238000013016 damping Methods 0.000 claims description 23
- 239000011229 interlayer Substances 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 6
- 230000002238 attenuated effect Effects 0.000 abstract 1
- 238000007789 sealing Methods 0.000 description 11
- 230000035939 shock Effects 0.000 description 9
- 229910001220 stainless steel Inorganic materials 0.000 description 8
- 239000010935 stainless steel Substances 0.000 description 8
- 229920001971 elastomer Polymers 0.000 description 6
- 230000000644 propagated effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 238000005192 partition Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000010985 leather Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000006854 communication Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005562 fading Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004445 quantitative analysis Methods 0.000 description 2
- 229920006169 Perfluoroelastomer Polymers 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000005987 sulfurization reaction Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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Abstract
The invention relates to a sound wave logging instrument with a sound insulation function. The sound wave logging instrument with the sound insulation function comprises a transmitting probe shaft, transmitting probes and outer protection tubes, wherein the transmitting probes are arranged on the transmitting probe shaft, and the outer protection tubes are sleeved on the transmitting probes; and the sound wave logging instrument with the sound insulation function further comprises a transmitting probe cabin direct wave sound insulation system, and the transmitting probe cabin direct wave sound insulation system is arranged on the transmitting probe shaft. According to the sound wave logging instrument with the sound insulation function, the amplitudes of direct waves at a 3-foot receiving probe and a 5-foot receiving probe can be effectively attenuated.
Description
Technical field
The invention belongs to petroleum detection field, relate to a kind of acoustic logging instrument, particularly relate to a kind of acoustic logging instrument with sound insulation function.
Background technology
Acoustic logging instrument is for checking the cementing degree at first, second interface thus judging cementing quality.Generally at distance instrument transmitting probe 3 feet and 5 feet punishment cloth two receiving transducers, 3 feet of receiving transducer record analysis Mintrop wave (sleeve pipe slide wave) amplitudes thus quantitative analysis is carried out to the Cementation Quality at the first interface, 5 feet of receiving transducer record analysis full-wave trains thus quantitative analysis is carried out to the Cementation Quality of second contact surface.The sound wave being arrived receiving transducer place by the route of transmission of mud or instrument itself is direct wave, and direct wave effective attenuation will cannot have a strong impact on cementing quality and assess.
Current acoustic logging instrument generally lacks the sound insulation measure of systematic science, cannot effective attenuation 3 feet of receiving transducers and 5 feet of receiving transducer place direct wave amplitudes, puts off direct wave time of advent.Easily cause direct wave and 3 feet and 5 feet of full-wave trains to interfere, make acoustic logging instrument well log interpretation data truly cannot reflect cementing quality, for later stage well cementing operation and oil producing operation bring major safety risks.Some acoustic logging instruments adopt leather bag structure, and defening effect increases, but, because underground working is very complicated, subsurface environment and have stronger corrosivity, the easy physics of leather bag structure pierces through or corrosion and ageing, adopts the acoustic logging instrument of leather bag structure to have again certain well logging limitation.
Summary of the invention
In order to solve the above-mentioned technical problem existed in background technology, the invention provides a kind of can the acoustic logging instrument with sound insulation function of effective attenuation 3 feet of receiving transducers and 5 feet of receiving transducer place direct wave amplitudes.
Technical solution of the present invention is: the invention provides a kind of acoustic logging instrument with sound insulation function, comprise transmitting probe axle, be arranged on the transmitting probe on transmitting probe axle and be sleeved on the outer pillar on transmitting probe, its special character is: described in there is sound insulation function acoustic logging instrument also comprise the transmitting probe cabin direct wave sound partiting system be arranged on transmitting probe axle;
Described transmitting probe cabin direct wave sound partiting system comprises sound absorption engineering plastics internal layer cylinder, sound insulating sandwich and the outer cylinder of sound absorption engineering plastics; Described sound absorption engineering plastics internal layer jacket casing is contained on transmitting probe axle; It is outside that described sound insulating sandwich is sleeved on sound absorption engineering plastics internal layer cylinder; The outer jacket casing of described sound absorption engineering plastics is contained in sound insulating sandwich outside; Described transmitting probe is arranged on the outer cylinder of sound absorption engineering plastics.
Above-mentioned sound absorption engineering plastics internal layer cylinder comprises the radial cylinder of sound absorption engineering plastics internal layer and the axial cylinder of sound absorption engineering plastics internal layer; The axial jacket casing of described sound absorption engineering plastics internal layer is contained on transmitting probe axle; It is outside that described sound insulating sandwich is sleeved on the axial cylinder of sound absorption engineering plastics internal layer; The outer cylinder of described sound absorption engineering plastics comprises the outer axial cylinder of sound absorption engineering plastics and the outer radial cylinder of sound absorption engineering plastics; The outer axial jacket casing of described sound absorption engineering plastics is contained in sound insulating sandwich outside; It is outside that described transmitting probe is arranged on the outer axial cylinder of sound absorption engineering plastics; The radial cylinder of described sound absorption engineering plastics internal layer and the outer radial cylinder of sound absorption engineering plastics are separately positioned on the both ends of transmitting probe.
Above-mentioned sound insulating sandwich is pure plumbous sound insulating sandwich.
Above-mentioned outer pillar is provided with one or more sound insulation groove.
Uniform or the non-uniform axis along outer pillar of above-mentioned multiple sound insulation groove is arranged.
Uniform or the non-uniform axial cross arrangement along outer pillar of above-mentioned multiple sound insulation groove is arranged.
The inside of above-mentioned transmitting probe axle is provided with instrument and crosses line, and described instrument is crossed line outer cover and metal screen layer is housed, and described metal screen layer is provided with damping interlayer.
Above-mentioned damping interlayer is arranged on the axial direction that line crossed by instrument.
Advantage of the present invention is:
The invention provides a kind of acoustic logging instrument with sound insulation function, this acoustic logging instrument comprises transmitting probe cabin direct wave sound partiting system, connecting cabin direct wave sound partiting system and crosses line direct wave sound insulation treatment system, these three sound insulation treatment systems are worked in coordination with or independent role, when instrument carries out logging operation, transmitting probe 6 carries out the direct wave transmitted along axle by transmitting probe axle 1, through the combined type sound partiting system of sound absorption engineering plastics skin, pure plumbous sound insulating sandwich, sound absorption engineering plastics internal layer composition, direct wave amplitude significantly decays.Sound absorption engineering plastics have higher damped coefficient, and direct wave is through the outer Es-region propagations of sound absorption engineering plastics, and amplitude decays rapidly; Sound absorption engineering plastics skin and pure plumbous sound insulating sandwich interface, because acoustic impedance difference is excessive, direct wave completely of not decaying is reflected in a large number; A small amount of direct wave amplitude in sound absorption engineering plastics internal layer communication process is decayed further.The direct wave that transmitting probe is propagated along outer pillar through launching connector, due to the sound insulation groove that outer pillar is arranged, direct wave propagation path increases, and direct wave is obviously delayed for the time of advent.The direct wave that transmitting probe is propagated along bellows through launching connector, through the damping rubber at the outer partition place of bellows stainless steel, direct wave amplitude obviously decays.The direct wave that transmitting probe is propagated through line, owing to being provided with damping interlayer on propagation path, direct wave amplitude fading is obvious.The acoustic logging instrument with sound insulation function provided by the present invention can effective attenuation 3 feet of receiving transducers and 5 feet of receiving transducer place direct wave amplitudes, direct wave time of advent can be postponed, thus improve acoustic logging instrument well logging accuracy; The system surfaces that this technology contacts with subsurface environment adopts stainless steel material and the engineering plastics of sulfuration resistant, excellent corrosion resistance, can expand the job area of the complicated special hole condition of acoustic logging instrument reply.
Accompanying drawing explanation
Fig. 1 is the structural representation of transmitting probe cabin of the present invention direct wave sound partiting system;
Fig. 2 is the structural representation of connecting cabin direct wave sound partiting system of the present invention;
Fig. 3 is the structural representation crossing line direct wave sound insulation treatment system of the present invention;
Wherein:
1-transmitting probe axle; The radial cylinder of 2-sound absorption engineering plastics internal layer; The pure plumbous sound insulating sandwich of 3-; The outer axial cylinder of 4-sound absorption engineering plastics; 5-first axial damping circle; 6-transmitting probe; The outer radial cylinder of 7-sound absorption engineering plastics; The radial shock absorbing ring of 8-first; The axial cylinder of 9-sound absorption engineering plastics internal layer; 10-launches connector; 11-first sealing ring; 12-second axial damping circle; 13-set bolt; The radial shock absorbing ring of 14-second; 15-entrant sound cover; 16-second sealing ring; 17-the 3rd axial damping circle; 18-the 3rd sealing ring; 19-seal receptacle; 20-adapter sleeve; 21-hold-down ring; 22-bellows; 23-damping rubber; 24-antifriction cover; 25-adjustment ring; The radial shock absorbing ring of 26-the 3rd; The outer pillar of 27-; 28-jackscrew.
Detailed description of the invention
The invention provides a kind of absorption, isolation, decay direct wave amplitude, postpone the system schema of direct wave time of advent and concrete means, sound partiting system comprises transmitting probe cabin direct wave sound partiting system, connecting cabin direct wave sound partiting system and crosses line direct wave sound insulation treatment system.
Transmitting probe cabin direct wave sound partiting system comprises transmitting probe axle, launches entrant sound cover and plays the different model O RunddichtringO of cushioning effect.Transmitting probe, sound absorption engineering plastics skin, pure plumbous sound insulating sandwich, sound absorption engineering plastics internal layer are fixed on by transmitting probe axle, launch in transmitting probe cabin that connector and transmitting entrant sound cover form.
The perfluoroelastomers that the sealing performance in transmitting probe cabin relies on corrosion resistance extremely strong.Sound absorption engineering plastics skin, pure plumbous sound insulating sandwich, sound absorption engineering plastics internal layer are by axial component and radial component composition.
Sound absorption engineering plastics have higher damped coefficient, can the direct wave amplitude of effective attenuation on its propagation path, postpone direct wave time of advent.Pure lead material has higher density, can reflect the most of direct wave through its interface.
Connecting cabin direct wave sound partiting system comprises with launching pod, receives coupling part that cabin is communicated with, bellows section and outer pillar part.
Coupling part is made up of adapter sleeve, adjustment ring, antifriction cover, seal receptacle; Adjustment ring is connected with seal receptacle by screw thread with antifriction cover, by axial displacement adjustment assembly gap.Bellows section inner core is made up of engineering plastics, compresses mechanical seal with seal receptacle by hold-down ring.Bellows section skin is made up of stainless steel, cuts off in the middle of stainless steel skin, and by mould pressing process, damping rubber is placed in partition place in the middle of stainless steel skin.Outer pillar part presses the sound insulation groove of design parameters processing some, increases direct wave propagation path.
Cross line direct wave sound insulation processing method by increasing damping interlayer decay direct wave at metal screen layer.
Shown in Fig. 1 and Fig. 2, the complete sound partiting system of acoustic logging instrument of the present invention, comprise transmitting probe axle 1, the radial cylinder 2 of sound absorption engineering plastics internal layer, pure plumbous sound insulating sandwich 3, the outer axial cylinder 4 of sound absorption engineering plastics, first axial damping circle 5, transmitting probe 6, the outer radial cylinder 7 of sound absorption engineering plastics, first radial shock absorbing ring 8, the axial cylinder 9 of sound absorption engineering plastics internal layer, launch connector 10, first sealing ring 11, second axial damping circle 12, set bolt 13, second radial shock absorbing ring 14, entrant sound cover 15, second sealing ring 16, 3rd axial damping circle 17, 3rd sealing ring 18, seal receptacle 19, adapter sleeve 20, hold-down ring 21, bellows 22, damping rubber 23, antifriction cover 24, adjustment ring 25, 3rd radial shock absorbing ring 26, outer pillar 27, jackscrew 28.
Please continue see Fig. 1, transmitting probe cabin of the present invention direct wave sound partiting system, transmitting probe axle 1, entrant sound cover 15 form transmitting probe cabin main body with transmitting connector 10, second sealing ring 16 is set between transmitting probe axle 1 and entrant sound cover 15, launches between connector 10 and entrant sound cover 15 and first sealing ring 11 and the second sealing ring 16 is set; Entrant sound cover 15 and transmitting probe axle 1 and launch between connector 10 and arrange the 3rd axial damping circle 17 respectively, avoid the rigid collision under judder and noise to produce; Transmitting probe 6 is fixed between the outer radial cylinder 7 of sound absorption engineering plastics and the outer axial cylinder 4 of sound absorption engineering plastics, and the outer radial cylinder 7 of sound absorption engineering plastics adopts with the outer axial cylinder 4 of sound absorption engineering plastics and is threaded; Transmitting probe 6 arranges the first axial damping circle 5 and the first radial shock absorbing ring 8 with the outer interlayer of sound absorption engineering plastics, thus plays gap adjustment and cushioning effect; Pure plumbous sound insulating sandwich 3 is placed between sound absorption engineering plastics skin and sound absorption engineering plastics internal layer, and the most of direct wave not having complete attenuation through sound absorption engineering plastics skin can be reflected in its interface; Sound absorption engineering plastics internal layer is made up of the radial cylinder 2 of the engineering plastics internal layer that absorbs sound and the axial cylinder 9 of sound absorption engineering plastics internal layer, and two parts are threaded connection; The axial cylinder 9 of sound absorption engineering plastics internal layer circumferentially uniform two fixing holes, are anchored on transmitting probe axle 1 by set bolt 13; Between sound absorption engineering plastics internal layer and transmitting probe axle 1, the second axial damping circle 12 and the second radial shock absorbing ring 14 is set.
Please continue see Fig. 2, connecting cabin direct wave sound partiting system of the present invention, bellows stainless steel skin adopts special process to cut off, and cuts off distance 15-20mm, and damping rubber 23 adopts mould pressing process to be placed in the outer partition place of bellows stainless steel; Bellows 22 and seal receptacle 19 are threaded by hold-down ring 21 and adopt the conical surface mechanically pressing sealed at incision position; Transmitting probe cabin is inserted in seal receptacle 19 one end, and the other end inserts receiving transducer cabin, and arranges the 3rd sealing ring 18 in junction; Seal receptacle 19 is threaded respectively by adapter sleeve 20 with receiving transducer cabin with transmitting probe cabin, seal receptacle 19; Adjustment ring 25 is threaded with seal receptacle 19, by axial displacement adjustment assembly distance, screws in jackscrew 28 and fixes; Adjustment ring 25 two ends arrange antifriction cover 24, arrange the 3rd radial shock absorbing ring 26 between adjustment ring 25 and adapter sleeve 20; Outer pillar 27 improves the system stiffness of instrument entirety, along its circumferential direction uniform 3 places sound insulation grooves and axial uniform crossover arrangement.
See Fig. 3, the sound insulation of line direct wave excessively treatment system of the present invention, the metal screen layer of line outer layer covers crossed by instrument, and certain distance arranges damping interlayer by special process vertically.
The acoustic logging instrument with sound insulation function provided by the present invention, when instrument carries out logging operation, transmitting probe 6 carries out the direct wave transmitted along axle by transmitting probe axle 1, through the combined type sound partiting system of sound absorption engineering plastics skin, pure plumbous sound insulating sandwich, sound absorption engineering plastics internal layer composition, see Fig. 1, direct wave amplitude significantly decays.Sound absorption engineering plastics have higher damped coefficient, and direct wave is through the outer Es-region propagations of sound absorption engineering plastics, and amplitude decays rapidly; Sound absorption engineering plastics skin and pure plumbous sound insulating sandwich interface, because acoustic impedance difference is excessive, direct wave completely of not decaying is reflected in a large number; A small amount of direct wave amplitude in sound absorption engineering plastics internal layer communication process is decayed further.The direct wave that transmitting probe 6 is propagated along outer pillar 27 through launching connector 10, due to the sound insulation groove that outer pillar 27 is arranged, direct wave propagation path increases, and direct wave is obviously delayed for the time of advent.The direct wave that transmitting probe 6 is propagated along bellows 22 through launching connector 10, when the damping rubber 23 at bellows stainless steel outer partition place, see Fig. 2, direct wave amplitude obviously decays.The direct wave that transmitting probe 6 is propagated through line, owing to being provided with damping interlayer on propagation path, see Fig. 3, direct wave amplitude fading is obvious.
Claims (8)
1. one kind has the acoustic logging instrument of sound insulation function, comprise transmitting probe axle, be arranged on the transmitting probe on transmitting probe axle and be sleeved on the outer pillar on transmitting probe, it is characterized in that: described in there is sound insulation function acoustic logging instrument also comprise the transmitting probe cabin direct wave sound partiting system be arranged on transmitting probe axle;
Described transmitting probe cabin direct wave sound partiting system comprises sound absorption engineering plastics internal layer cylinder, sound insulating sandwich and the outer cylinder of sound absorption engineering plastics; Described sound absorption engineering plastics internal layer jacket casing is contained on transmitting probe axle; It is outside that described sound insulating sandwich is sleeved on sound absorption engineering plastics internal layer cylinder; The outer jacket casing of described sound absorption engineering plastics is contained in sound insulating sandwich outside; Described transmitting probe is arranged on the outer cylinder of sound absorption engineering plastics.
2. the acoustic logging instrument with sound insulation function according to claim 1, is characterized in that: described sound absorption engineering plastics internal layer cylinder comprises the radial cylinder of sound absorption engineering plastics internal layer and the axial cylinder of sound absorption engineering plastics internal layer; The axial jacket casing of described sound absorption engineering plastics internal layer is contained on transmitting probe axle; It is outside that described sound insulating sandwich is sleeved on the axial cylinder of sound absorption engineering plastics internal layer; The outer cylinder of described sound absorption engineering plastics comprises the outer axial cylinder of sound absorption engineering plastics and the outer radial cylinder of sound absorption engineering plastics; The outer axial jacket casing of described sound absorption engineering plastics is contained in sound insulating sandwich outside; It is outside that described transmitting probe is arranged on the outer axial cylinder of sound absorption engineering plastics; The radial cylinder of described sound absorption engineering plastics internal layer and the outer radial cylinder of sound absorption engineering plastics are separately positioned on the both ends of transmitting probe.
3. the acoustic logging instrument with sound insulation function according to claim 2, is characterized in that: described sound insulating sandwich is pure plumbous sound insulating sandwich.
4. the acoustic logging instrument with sound insulation function according to the arbitrary claim of claim 1-3, is characterized in that: described outer pillar is provided with one or more sound insulation groove.
5. the acoustic logging instrument with sound insulation function according to claim 4, is characterized in that: the uniform or non-uniform axis along outer pillar of described multiple sound insulation groove is arranged.
6. the acoustic logging instrument with sound insulation function according to claim 5, is characterized in that: the uniform or non-uniform axial cross arrangement along outer pillar of described multiple sound insulation groove is arranged.
7. the acoustic logging instrument with sound insulation function according to claim 6, is characterized in that: the inside of described transmitting probe axle is provided with instrument and crosses line, and described instrument is crossed line outer cover and metal screen layer is housed, and described metal screen layer is provided with damping interlayer.
8. the acoustic logging instrument with sound insulation function according to claim 7, is characterized in that: described damping interlayer is arranged on the axial direction that line crossed by instrument.
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| CN201210559701.XA CN102996118B (en) | 2012-12-20 | 2012-12-20 | Sound wave logging instrument with sound insulation function |
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| CN201210559701.XA CN102996118B (en) | 2012-12-20 | 2012-12-20 | Sound wave logging instrument with sound insulation function |
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| CN102996118B true CN102996118B (en) | 2015-07-15 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104712324B (en) * | 2014-12-11 | 2018-01-19 | 杭州丰禾石油科技有限公司 | Novel sound body well logging apparatus and Optimal Design Method for acoustic logging instrument |
| CN206479249U (en) * | 2017-02-22 | 2017-09-08 | 苏州易德龙科技股份有限公司 | Ultrasonic sensor |
| CN107143333A (en) * | 2017-07-12 | 2017-09-08 | 黄河勘测规划设计有限公司 | Acoustic isolater for hydraulic engineering full wave train acustic logging inserting tube |
| CN111441730A (en) * | 2020-04-26 | 2020-07-24 | 中国石油天然气集团有限公司 | Sound insulation short joint of acoustic logging instrument |
| CN115628040A (en) * | 2022-09-27 | 2023-01-20 | 杭州瑞利声电技术有限公司 | Acoustic system structure of large-size borehole acoustic logging instrument and logging method |
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| CN2802085Y (en) * | 2005-06-17 | 2006-08-02 | 中国石化集团胜利石油管理局测井公司 | Acoustic system of digital acoustic log equipment |
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| CN203050676U (en) * | 2012-12-20 | 2013-07-10 | 西安思坦仪器股份有限公司 | Sound-wave logging instrument with function of sound insulation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7334661B2 (en) * | 2004-02-05 | 2008-02-26 | Schlumberger Technology Corporation | Acoustic logging tool sleeve |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2802085Y (en) * | 2005-06-17 | 2006-08-02 | 中国石化集团胜利石油管理局测井公司 | Acoustic system of digital acoustic log equipment |
| CN101900828A (en) * | 2009-05-25 | 2010-12-01 | 中国石油集团长城钻探工程有限公司 | Acoustic detection device |
| CN202453512U (en) * | 2012-02-02 | 2012-09-26 | 中国石油化工股份有限公司 | Sound insulator of sonic probe |
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| CN203050676U (en) * | 2012-12-20 | 2013-07-10 | 西安思坦仪器股份有限公司 | Sound-wave logging instrument with function of sound insulation |
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Denomination of invention: Acoustic logging tool with sound insulation function Effective date of registration: 20230111 Granted publication date: 20150715 Pledgee: Export Import Bank of China Gansu Branch Pledgor: Xi'an Sitan Instruments Co.,Ltd. Registration number: Y2023620000007 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Granted publication date: 20150715 Pledgee: Export Import Bank of China Gansu Branch Pledgor: Xi'an Sitan Instruments Co.,Ltd. Registration number: Y2023620000007 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Acoustic logging tool with sound insulation function Granted publication date: 20150715 Pledgee: Export Import Bank of China Gansu Branch Pledgor: Xi'an Sitan Instruments Co.,Ltd. Registration number: Y2024620000004 |