CN102733798B - Underground ropeless testing system for oil well - Google Patents
Underground ropeless testing system for oil well Download PDFInfo
- Publication number
- CN102733798B CN102733798B CN201210154062.9A CN201210154062A CN102733798B CN 102733798 B CN102733798 B CN 102733798B CN 201210154062 A CN201210154062 A CN 201210154062A CN 102733798 B CN102733798 B CN 102733798B
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- sensor group
- electromagnetic wave
- underground
- magnetic
- downhole
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- 238000012360 testing method Methods 0.000 title claims abstract description 62
- 239000003129 oil well Substances 0.000 title claims abstract description 27
- 238000012545 processing Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 6
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 claims description 2
- 239000010941 cobalt Substances 0.000 claims description 2
- 229910017052 cobalt Inorganic materials 0.000 claims description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 229910001172 neodymium magnet Inorganic materials 0.000 claims description 2
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 2
- 150000002910 rare earth metals Chemical class 0.000 claims description 2
- 238000004018 waxing Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000010276 construction Methods 0.000 abstract description 5
- 238000005086 pumping Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 18
- 238000005516 engineering process Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0085—Adaptations of electric power generating means for use in boreholes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/13—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Electromagnetism (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The embodiment of the invention provides an underground ropeless testing system for an oil well. The underground ropeless testing system comprises a wireless tester and a self-generating set, wherein the wireless tester comprises an underground tester, a sensor group, an underground test end circuit and an electromagnetic wave transmitter, wherein the sensor group is arranged on the underground tester, the underground test end circuit is connected with the sensor group and used for amplifying and converting production data collected by the sensor group; and the electromagnetic wave transmitter is connected with the underground test end circuit, and used for transmitting the processed production data to a ground processing system. The sensor group, the underground test end circuit and the electromagnetic wave transmitter are arranged on the underground tester, thus ropeless directly-reading test of underground production data of a pumping machine is realized, and the problems of high cost and large construction difficulty existing in the prior art are solved.
Description
Technical field
The present invention, about oil field well monitoring technology, particularly about oil well direct-reading measurement technology, is that a kind of oil well is without cable test system concretely.
Background technology
Along with the development of oil field technology, crude oil production technique increases increasingly.In oil field development manufacturing process, in the manufacturing process of particularly some emphasis wells, need to carry out Real-time Collection by the creation data such as temperature, pressure, flow of downhole testing instrument to down-hole, Real-Time Monitoring is carried out to down-hole, to carry out dynamic evaluation to oil reservoir.
Down-hole of the prior art direct-reading measurement technology is generally carried out in the following way: in underground work process, enter under the tester of down-hole under pump, and by logging cable with binding mode with in oil pipe together lower going-into-well.There is following defect in above-mentioned down-hole direct-reading measurement technology: because the logging cable after having tested can not reuse, and therefore causes the cost of production of whole down-hole direct-reading system high; Owing to needing to rely on logging cable in direct-reading measurement technology, and easily there is the phenomenons such as card breaks in logging cable in operation process, causes the defect that work operations amount is large, safety reduces to whole direct-reading measurement process.
Summary of the invention
Embodiments provide a kind of oil well without cable test system, by arranging sensor group, downhole testing terminal circuit and electromagnetic wave launcher on downhole tester, achieve creation data under rod-pumped well without cable direct reading test, solve the problem that the cost existed in prior art is high and difficulty of construction is large.
The object of the invention is, provide a kind of oil well without cable test system, comprise wireless test apparatus and self-generating device,
Wherein, described wireless test apparatus comprises: downhole tester 2, for carrying out Real-Time Monitoring to the creation data of down-hole;
Be arranged on the sensor group 11 on described downhole tester 2, for gathering the creation data of described downhole tester 2;
The downhole testing terminal circuit 3 be connected with described sensor group 11, the creation data for described sensor group 11 being gathered carries out amplifying, conversion process;
The electromagnetic wave launcher 17 be connected with described downhole testing end line 3, for transmitting Ground Processing System 12 by the creation data after process;
Inside be provided with described sensor group 11, downhole testing terminal circuit 3 and electromagnetic wave launcher 17 without magnetic holder cylinder 4;
Be connected to the described oil well pump 5 without magnetic holder cylinder 4 upper end and oil pipe column 8;
Described self-generating device comprises: be connected to described without magnetic holder cylinder 4 upper end without magnetic oil pipe 15, coil groups 6 is equidistantly wrapped in the outside without magnetic oil pipe 15;
The device for converting electric energy 16 be connected with described downhole testing terminal circuit 3, sensor group 11 and electromagnetic wave launcher 17, for powering to described downhole testing terminal circuit 3, sensor group 11 and electromagnetic wave launcher 17;
The magnetic sucker rod 7 be connected with oil pumper 10, is provided with sucker rod 14.
Beneficial effect of the present invention is, by arranging sensor group, downhole testing terminal circuit and electromagnetic wave launcher on downhole tester, the creation data of downhole tester collection is transmitted into Ground Processing System through stratum by electromagnetic wave in the form of a carrier, and then achieve creation data under rod-pumped well without cable direct reading test, solve the problem that the cost existed in prior art is high and difficulty of construction is large.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
A kind of oil well that Fig. 1 provides for the embodiment of the present invention is without the structural representation of cable test system;
A kind of oil well that Fig. 2 provides for the embodiment of the present invention is without the structure diagram of magnetic sucker rod in cable test system;
A kind of oil well that Fig. 3 provides for the embodiment of the present invention is without the schematic diagram of downhole testing terminal circuit in cable test system;
A kind of oil well that Fig. 4 provides for the embodiment of the present invention is without the structural representation of electromagnetic wave launcher in cable test system;
A kind of oil well that Fig. 5 provides for the embodiment of the present invention is without the structural representation of Ground Processing System in cable test system.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
A kind of oil well that Fig. 1 provides for the embodiment of the present invention is without the structural representation of cable test system, and as shown in Figure 1, the embodiment of the present invention provides a kind of oil well to comprise wireless test apparatus and self-generating device without cable test system,
Wherein, described wireless test apparatus comprises: downhole tester 2, for carrying out Real-Time Monitoring to the creation data of down-hole.In the practical application of oil well operation, be arranged on the sensor group 11 on described downhole tester 2, for gathering the creation data of described downhole tester 2.In the practical application of oil well operation, creation data generally comprises the data such as temperature, pressure, flow of down-hole.
The downhole testing terminal circuit 3 be connected with described sensor group 11, the creation data for described sensor group 11 being gathered carries out amplifying, conversion process.Fig. 3 is the schematic diagram of downhole testing terminal circuit, as shown in Figure 3, and the direct-reading data acquisition circuit that downhole testing terminal circuit is is core with Pic single-chip microcomputer.Pic single-chip microcomputer carries out A/D conversion to the sensor signal inputted from RA0-RA3 (signal to be collected, easily extensible).Result after conversion is from the TX(RB0 pin of pic single-chip microcomputer) export, TX is connected to signal and is sent to driver module (MOS switch), and signal is coupled on the external cable of 12v, and is connected to form communication with electromagnetic wave areal receiver-array device.C3, R9, R10, R12, C4 and comparator also can form signal receiving circuit, receive can circuit on electromagnetic wave short distance cable signal take out, from RX(RB1 pin) be input to Pic single-chip microcomputer.
The electromagnetic wave launcher 17 be connected with described downhole testing end line 3, for transmitting Ground Processing System 12 by the creation data after process.Theoretical according to electromagnetic wave wireless transmission, creation data, under specific frequency, is transferred to Ground Processing System by electromagnetic wave launcher 17.Fig. 4 is the structural representation of electromagnetic wave launcher, as shown in Figure 4, electromagnetic wave launcher 17 comprises emission interface 171, digital to analog converter 172, power amplifier 173, encoder 174, underground signal transmitting antenna 175, wherein, the signal that downhole tester 2 gathers is sent in electromagnetic wave launcher by described emission interface, after digital to analog converter, power amplifier process, encoded by encoder, (can be between 5Hz ~ 35Hz in detailed description of the invention) under a certain CF and be sent to Ground Processing System 12 by underground signal transmitting antenna.
Fig. 5 is the structural representation of Ground Processing System, as shown in Figure 5, described Ground Processing System 12 comprises ground signal reception antenna 121, ground signal digital to analog converter 122, ground power amplifier 123, wave filter 124, decoder 125, changeover switch 126 and data processor 127.After ground signal reception antenna receives underground signal, by ground signal amplifier, ground signal digital to analog converter and wave filter, this signal is amplified, digital-to-analogue conversion, filtering and decoding operation, thereafter signal is sent to and is processed by data processor, obtain required downhole testing data.
Described wireless test apparatus also comprise inside be provided with described sensor group 11, downhole testing terminal circuit 3 and electromagnetic wave launcher 17 without magnetic holder cylinder 4;
Be connected to the described oil well pump (5) without magnetic holder cylinder (4) upper end and oil pipe column (8).
Described self-generating device comprises: be connected to described without magnetic holder cylinder (4) upper end without magnetic oil pipe (15), coil groups (6) is equidistantly wrapped in the outside without magnetic oil pipe (15).In a particular embodiment, coil groups 6 can be multiturn copper coil.
The device for converting electric energy 16 be connected with described downhole testing terminal circuit 3, sensor group 11 and electromagnetic wave launcher 17, for powering to described downhole testing terminal circuit 3, sensor group 11 and electromagnetic wave launcher 17.Device for converting electric energy has brush-commutated function and storage function simultaneously.
The magnetic sucker rod 7 be connected with oil pumper 10, is provided with sucker rod 14.
As shown in Figure 1, oil well except above-mentioned parts, also comprises the perforation pipeline section 1 be arranged on sleeve pipe 9 without cable test system.
A kind of oil well that Fig. 2 provides for the embodiment of the present invention is without the structure diagram of magnetic sucker rod in cable test system, as shown in Figure 2, the two ends of described magnetic sucker rod 7 are provided with connecting thread 19, described connecting thread 19 is provided with centralizer 18, described magnetic sucker rod 7 is provided with permanent magnet 20.As shown in Figure 2, in a particular embodiment, described magnetic sucker rod 7 can be oil well magnetic anti-waxing apparatus, permanent magnet 20 is set on the apparatus, permanent magnet 20 material is neodymium iron boron or Rare-Earth Cobalt, and its Surface field intensity is more than 5000GS, and the two ends connecting thread 19 of magnetic sucker rod 7 installs magnetic oil pumping rod centering device 18, anti-stopping bar, pipe eccentric wear, this device plays the effect of cutting magnetic line (generating) and oil well paraffin prevention and absorption iron filings simultaneously in down-hole.
As shown in Figure 1, the magnetic oil pumping rod centering device 18 that magnetic sucker rod 7 is installed is lowered into a precalculated position, namely ensure and have certain relative travel without the multiturn copper coil 6 on magnetic oil pipe 15, magnetic sucker rod 7 is installed sucker rod 14, carry out in motion process up and down reciprocatingly at oil pumper 10, drive magnetic sucker rod 7 to move, thus cause the magnetic field intensity in multiturn copper coil 6 to change, in Fig. 1,11 is well head.Under the effect of device for converting electric energy 16, the electric energy of generation is sent to sensor group 11 and electromagnetic wave launcher 17.The signal that sensor group 11 gathers by downhole testing terminal circuit 3 is after amplification, conversion process, utilize electromagnetic wave wireless transmission theoretical, by electromagnetic wave launcher 17 under particular transmit frequency, be sent in Ground Processing System 12 via without after magnetic holder cylinder 4, perforation pipeline section 1, stratum and antenna 13, and then realize transmitting and direct-reading measurement without cable of downhole testing result.
The present invention can realize downhole production data without cable, accurately, on-line normalization, test macro can reuse, effectively reduce production operation cost, be 1000m by average lower-continuous mapping, the cost of downhole testing cable 28 yuan/m calculates, every mouthful of well can save nearly more than 30000 yuan of direct cost, decreases the activity duration simultaneously, reduces the operation intensity of workman.
In sum, useful achievement of the present invention is: by arranging sensor group, downhole testing terminal circuit and electromagnetic wave launcher on downhole tester, achieve creation data under rod-pumped well without cable direct reading test, solve the problem that the cost existed in prior art is high and difficulty of construction is large.
Advantage of the present invention is:
1. creatively on oil well pump without winding around group equally spaced on magnetic oil pipe, supporting sucker rod is magnetic sucker rod, the feature utilizing rod-pumped well to pump and electromagnetic induction principle, devising a kind ofly can provide the self-generating device of electric energy for downhole tester and electromagnetic wave launcher, for oil well provides electric energy input without cable test system.
2. sensor group, downhole testing terminal circuit and electromagnetic wave launcher are creatively set on downhole tester, the creation data of downhole tester collection is transmitted into Ground Processing System through stratum by electromagnetic wave in the form of a carrier, achieve creation data under rod-pumped well without cable direct reading test, solve the problem that the cost existed in prior art is high and difficulty of construction is large.
Apply specific embodiment in the present invention to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (4)
1. oil well is without a cable test system, it is characterized in that, described system comprises wireless test apparatus and self-generating device,
Wherein, described wireless test apparatus comprises:
Downhole tester (2), for carrying out Real-Time Monitoring to the creation data of down-hole;
Be arranged on the sensor group (11) on described downhole tester (2), for gathering the creation data of the down-hole of described downhole tester (2) Real-Time Monitoring;
The downhole testing terminal circuit (3) be connected with described sensor group (11), the creation data for described sensor group (11) being gathered carries out amplifying, conversion process;
The electromagnetic wave launcher (17) be connected with described downhole testing end line (3), for transmitting Ground Processing System (12) by the creation data after process;
Inside be provided with described sensor group (11), downhole testing terminal circuit (3) and electromagnetic wave launcher (17) without magnetic holder cylinder (4);
Be connected to the described oil well pump (5) without magnetic holder cylinder (4) upper end and oil pipe column (8);
Described self-generating device comprises: be connected to described without magnetic holder cylinder (4) upper end without magnetic oil pipe (15), coil groups (6) is equidistantly wrapped in the outside without magnetic oil pipe (15);
The device for converting electric energy (16) be connected with described downhole testing terminal circuit (3), sensor group (11) and electromagnetic wave launcher (17), for powering to described downhole testing terminal circuit (3), sensor group (11) and electromagnetic wave launcher (17);
The magnetic sucker rod (7) be connected with oil pumper (10), is provided with sucker rod (14);
Sleeve pipe (9) and the perforation pipeline section (1) be arranged on sleeve pipe (9);
Described magnetic sucker rod (7) is oil well magnetic anti-waxing apparatus, arranges permanent magnet (20) on the apparatus, and permanent magnet (20) material is neodymium iron boron or Rare-Earth Cobalt, and its Surface field intensity is more than 5000GS;
Described electromagnetic wave launcher (17) comprises emission interface, digital to analog converter, power amplifier, encoder, underground signal transmitting antenna.
2. system according to claim 1, is characterized in that, the two ends of described magnetic sucker rod (7) are provided with connecting thread (19).
3. system according to claim 2, is characterized in that, described connecting thread (19) is provided with centralizer (18).
4. system according to claim 1, it is characterized in that, described Ground Processing System (12) comprises ground signal reception antenna, ground signal digital to analog converter, ground power amplifier, wave filter, decoder, changeover switch and data processor.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210154062.9A CN102733798B (en) | 2012-05-17 | 2012-05-17 | Underground ropeless testing system for oil well |
| PCT/CN2013/072687 WO2013170654A1 (en) | 2012-05-17 | 2013-03-15 | Underground cableless test system of oil well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210154062.9A CN102733798B (en) | 2012-05-17 | 2012-05-17 | Underground ropeless testing system for oil well |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102733798A CN102733798A (en) | 2012-10-17 |
| CN102733798B true CN102733798B (en) | 2015-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210154062.9A Active CN102733798B (en) | 2012-05-17 | 2012-05-17 | Underground ropeless testing system for oil well |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102733798B (en) |
| WO (1) | WO2013170654A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102733798B (en) * | 2012-05-17 | 2015-07-08 | 中国石油天然气股份有限公司 | Underground ropeless testing system for oil well |
| CN107130957A (en) * | 2016-02-26 | 2017-09-05 | 中国石油化工股份有限公司 | A kind of Oil/gas Well downhole monitoring system and the confession method for electrically for the monitoring system |
| CN106950277A (en) * | 2017-03-29 | 2017-07-14 | 中国海洋石油总公司 | The drilling rod or Magnetic Flux Leakage Equipment for Oil Pipe Testing and detection method of a kind of marine jack rabbit formula |
| CN108547600B (en) * | 2018-04-18 | 2020-02-18 | 吉林大学 | Method for exploiting natural gas hydrate by utilizing electromagnetic heating mode |
| CN110608035A (en) * | 2019-10-25 | 2019-12-24 | 武汉三江航天远方科技有限公司 | Testing system and method for wireless transmission of downhole data of oil well |
| CN113338918A (en) * | 2020-03-03 | 2021-09-03 | 中国石油天然气股份有限公司 | Data transmission system and method for rod pump rod-pumped well |
| CN112855117A (en) * | 2021-01-14 | 2021-05-28 | 大庆油田有限责任公司 | High-durability and readable-back wireless radio frequency downhole multilayer test pipe column |
| CN115680633B (en) * | 2022-12-30 | 2023-05-23 | 中国石油天然气股份有限公司 | Information transmission device and information transmission method for oil production well |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2395614Y (en) * | 1999-09-30 | 2000-09-13 | 孟凡刚 | Bottom block for regulating height of desk |
| CN201232545Y (en) * | 2008-06-11 | 2009-05-06 | 中国石油集团钻井工程技术研究院 | Downhole wireless electromagnetical signal radiation apparatus while drilling |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7495446B2 (en) * | 2005-08-23 | 2009-02-24 | Schlumberger Technology Corporation | Formation evaluation system and method |
| CN2935614Y (en) * | 2006-07-18 | 2007-08-15 | 中国石油天然气股份有限公司 | Underground generator for well pumping unit |
| CN102251769A (en) * | 2011-06-08 | 2011-11-23 | 刘新元 | Electromagnetic wave signal transmission method and system of measurement while drilling |
| CN102733798B (en) * | 2012-05-17 | 2015-07-08 | 中国石油天然气股份有限公司 | Underground ropeless testing system for oil well |
-
2012
- 2012-05-17 CN CN201210154062.9A patent/CN102733798B/en active Active
-
2013
- 2013-03-15 WO PCT/CN2013/072687 patent/WO2013170654A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2395614Y (en) * | 1999-09-30 | 2000-09-13 | 孟凡刚 | Bottom block for regulating height of desk |
| CN201232545Y (en) * | 2008-06-11 | 2009-05-06 | 中国石油集团钻井工程技术研究院 | Downhole wireless electromagnetical signal radiation apparatus while drilling |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013170654A1 (en) | 2013-11-21 |
| CN102733798A (en) | 2012-10-17 |
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