CN104373109A - Simulation device for wireline logging ground auxiliary signals - Google Patents
Simulation device for wireline logging ground auxiliary signals Download PDFInfo
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- CN104373109A CN104373109A CN201410610722.9A CN201410610722A CN104373109A CN 104373109 A CN104373109 A CN 104373109A CN 201410610722 A CN201410610722 A CN 201410610722A CN 104373109 A CN104373109 A CN 104373109A
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- 238000004088 simulation Methods 0.000 title claims abstract description 14
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 32
- 238000001914 filtration Methods 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 6
- 230000037361 pathway Effects 0.000 claims description 6
- 230000008054 signal transmission Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 7
- 238000012423 maintenance Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000013024 troubleshooting Methods 0.000 description 2
- 230000005355 Hall effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
Classifications
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- 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
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- 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
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- Environmental & Geological Engineering (AREA)
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- Control Of Electric Motors In General (AREA)
Abstract
The invention discloses a simulation device for wireline logging auxiliary signals. The simulation device comprises a depth signal generation module, a tension signal generation module, an MMD signal generation module, a signal acquisition module and a power control module. The depth signal generation module generates a depth signal through a motor and a depth encoder and transmits the depth signal to the signal acquisition module; the tension signal generation module generates a first direct current signal through a first direct current signal generation circuit, simulates a tension signal through the first direct current signal and transmits the tension signal to the signal acquisition module; the MMD signal generation module generates a second direct current signal through a second direct current signal generation circuit, simulates an MMD signal through the second direct current signal and transmits the MMD signal to the signal acquisition module; the signal acquisition module outputs the depth signal, the tension signal and the MMD signal; the power control module is used for supplying power to the depth signal generation module, the tension signal generation module, the MMD signal generation module and the signal acquisition module. By means of the simulation device for the wireline logging ground auxiliary signals, simulation on the depth, tension and MMD ground auxiliary signals is achieved.
Description
Technical field
The present invention relates to well logging field, especially a kind of analogue means of wireline logging auxiliary signal.
Background technology
In wireline logging operation, the degree of depth, tension force, MMD (Magnet ic Mark Device, magnetic mark device) etc. auxiliary signal be very important three test parameters, these parameters directly affect the validity of well-log information and the safety of well logging.But in actual applications, these three kinds of signals easily break down.Once break down, in existing maintenance process, need to utilize logging skid to carry out actual test by the squad that logs well, judge according to test result.
Logging skid and the well logging squad of this maintenance process need reality just can complete, and maintenance efficiency is low.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of analogue means of wireline logging auxiliary signal, can the auxiliary signal of dummycable well logging, makes the simulation auxiliary signal provided by this device when auxiliary signal fault can investigate fault fast.
For solving the problems of the technologies described above, the invention provides the analogue means of a kind of wireline logging ground auxiliary signal, comprising:
Depth signal generation module, comprises motor and depth encoder, and depth encoder described in described driven by motor rotates, and described depth encoder produces the depth signal corresponding with rotating the number of turns, and described depth signal is transferred to signal acquisition module;
Tension signal generation module, comprise the first direct current signal and produce circuit, when described first direct current signal produces circuit pathways, produce the first direct current signal in the first range of voltage values arranged, use described first direct current signal simulation tension signal and transfer to described signal acquisition module;
Magnetic mark device MMD signal generator module, comprise the second direct current signal and produce circuit, produce the second direct current signal in the second range of voltage values arranged when described second direct current signal produces circuit pathways, use described second direct current signal simulation MMD signal and transfer to described signal acquisition module;
Described signal acquisition module, exports described depth signal, tension signal and MMD signal; And
Energy supply control module, for powering for described depth signal generation module, tension signal generation module, MMD signal generator module and signal acquisition module.
Preferably, described depth signal generation module also comprises Hall element sum counter;
Described depth encoder is also included in it and rotates magnet fixing on skeleton;
Described Hall element is relative with described magnet and be fixed on outside circumference that described magnet rotors formed, and described Hall element produces the signal of telecommunication according to the change in magnetic field and transfers to described counter; Described counter determines the rotation number of turns of described depth encoder according to the described signal of telecommunication, and transfers to the display floater of described signal acquisition module.
Preferably, described depth signal generation module also comprises Hall element sum counter;
Described depth encoder is also included in it and rotates magnet fixing on skeleton;
Described Hall element is relative with described magnet and be fixed on outside circumference that described magnet rotors formed, and described Hall element produces the signal of telecommunication according to the change in magnetic field and transfers to described counter; Described counter determines the rotation number of turns of described depth encoder according to the described signal of telecommunication, the degree of depth of often rotating a circle correspondence in conjunction with the described Hall element arranged obtains additional depth signal, by described additional depth Signal transmissions to the display floater of described signal acquisition module.
Preferably, described motor is connected by dwang with described depth encoder, and described magnet is fixed on described dwang.
Preferably, whenever described depth encoder drives described magnet rotors through described Hall element, described Hall element produces a voltage pulse signal, and described voltage pulse signal is transferred to described counter.
Preferably, described first direct current signal produces circuit and comprises the first switch and second switch, produce maximum tension signal when closed, the described second switch of described first switch disconnects, produce minimum tension signal when closed, the described second switch of described first switch disconnects.
Preferably, described second direct current signal produces circuit and comprises contact switch, produces described MMD signal when described contact switch closes.
Preferably, described energy supply control module be input as alternating current, after the wide square wave rectifying and wave-filtering of rectifying and wave-filtering, high-frequency converter and tune, export DC voltage.
Preferably, described energy supply control module also comprises control circuit, for providing Voltage Feedback, stablizes described DC voltage.
Preferably, this device also comprises blower module, for dispersing the heat produced in described analogue means.
Technique scheme of the present invention has following beneficial effect:
Realize the simulation to the degree of depth, tension force and MMD ground auxiliary signal by the analogue means of wireline logging auxiliary signal, thus in troubleshooting process, do not need practical logging to drag sled and well logging squad, maintenance efficiency is high.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from manual, or understand by implementing the present invention.Object of the present invention and other advantages realize by structure specifically noted in manual, claims and accompanying drawing and obtain.
Accompanying drawing explanation
Accompanying drawing is used to provide the further understanding to technical solution of the present invention, and forms a part for manual, is used from and explains technical scheme of the present invention, do not form the restriction to technical solution of the present invention with the embodiment one of the application.
The structural representation of the analogue means of the wireline logging ground auxiliary signal that Fig. 1 provides for the embodiment of the present invention;
The structural representation of the analogue means of another wireline logging ground auxiliary signal that Fig. 2 provides for the embodiment of the present invention;
The structural representation of the analogue means of another wireline logging ground auxiliary signal that Fig. 3 provides for the embodiment of the present invention;
The front-panel structure schematic diagram of the analogue means of the wireline logging ground auxiliary signal that Fig. 4 provides for the embodiment of the present invention;
Fig. 5 illustrates the organigram of the cabinet inside of the analogue means of the wireline logging ground auxiliary signal that the embodiment of the present invention provides;
Fig. 6 illustrates the circuit theory diagrams of the power control part in the analogue means of the wireline logging ground auxiliary signal that the embodiment of the present invention provides;
Fig. 7 illustrates the physical circuit that circuit theory diagrams shown in Fig. 6 are corresponding;
Fig. 8 illustrates the circuit diagram of the Electric Machine Control part in the analogue means of the wireline logging ground auxiliary signal that the embodiment of the present invention provides;
Fig. 9 illustrates the circuit diagram of the rotation number of turns collecting part in the analogue means of the wireline logging ground auxiliary signal that the embodiment of the present invention provides; And
Figure 10 illustrates the circuit diagram of the signals collecting part in the analogue means of the wireline logging ground auxiliary signal that the embodiment of the present invention provides.
Detailed description of the invention
For making object of the invention process, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Described embodiment is the present invention's part embodiment, instead of whole embodiments.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.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.Below in conjunction with accompanying drawing, embodiments of the invention are described in detail.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limiting the scope of the invention can not be interpreted as.
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can be combined mutually.
The embodiment of the present invention provides the analogue means of a kind of wireline logging ground auxiliary signal, as shown in Figure 1, this device 100 comprises depth signal generation module 10, tension signal generation module 20, MMD signal generator module 30, signal acquisition module 40 and energy supply control module 50, and each module is specifically described as follows.
Depth signal generation module 10, comprise motor 11 and depth encoder 12, described motor 11 drives described depth encoder 12 to rotate, and described depth encoder 12 produces the depth signal corresponding with rotating the number of turns, and described depth signal is transferred to signal acquisition module 40.
Tension signal generation module 20, comprise the first direct current signal and produce circuit, when described first direct current signal produces circuit pathways, produce the first direct current signal in the first range of voltage values arranged, use described first direct current signal simulation tension signal and transfer to described signal acquisition module.Preferably, described first direct current signal produces circuit and comprises the first switch and second switch, produce maximum tension signal when closed, the described second switch of described first switch disconnects, produce minimum tension signal when closed, the described second switch of described first switch disconnects.Wherein, the first switch and second switch can be separate, or single-pole double-throw switch (SPDT) can be used to replace the first separate switch and second switch.
MMD signal generator module 30, comprise the second direct current signal and produce circuit, produce the second direct current signal in the second range of voltage values arranged when described second direct current signal produces circuit pathways, use described second direct current signal simulation MMD signal and transfer to described signal acquisition module..Wherein, described second direct current signal produces circuit and comprises contact switch, produces described MMD signal when described contact switch closes.
Described signal acquisition module 40, exports described depth signal, tension signal and MMD signal.
Energy supply control module 50, for powering for described depth signal generation module 10, tension signal generation module 20, MMD signal generator module 30 and signal acquisition module 40.Preferably, described energy supply control module 50 be input as alternating current, after the wide square wave rectifying and wave-filtering of rectifying and wave-filtering, high-frequency converter and tune, export DC voltage.Described energy supply control module 50 can also comprise control circuit, for providing Voltage Feedback, stablizes described DC voltage.
Wherein, as shown in Figure 2, preferably, described depth signal generation module 10 also comprises Hall element 13 sum counter 14;
Described depth encoder 12 is also included in it and rotates magnet 121 fixing on skeleton;
Described Hall element 13 is relative with described magnet 121 and be fixed on outside circumference that described magnet rotors formed, and described Hall element 13 produces the signal of telecommunication according to the change in magnetic field and transfers to described counter 14; Described counter 14 determines the rotation number of turns of described depth encoder according to the described signal of telecommunication, and transfers to the display floater of described signal acquisition module 40; Or
Described Hall element 13 is relative with described magnet 121 and be fixed on outside circumference that described magnet rotors formed, and described Hall element 13 produces the signal of telecommunication according to the change in magnetic field and transfers to described counter; Described counter 14 determines the rotation number of turns of described depth encoder according to the described signal of telecommunication, the degree of depth of often rotating a circle correspondence in conjunction with the described Hall element arranged obtains additional depth signal, by described additional depth Signal transmissions to the display floater of described signal acquisition module 40.
Preferably, described motor 11 can be connected by dwang with described depth encoder 12, and described magnet 121 can be fixed on (not shown) on described dwang.
Preferably, whenever described depth encoder drives described magnet rotors through described Hall element, described Hall element produces a voltage pulse signal, and described voltage pulse signal is transferred to described counter.
In addition, as shown in Figure 3, this analogue means can also comprise blower module 60, for dispersing the heat produced in described analogue means.
Application example
In an application example, the analogue means that the embodiment of the present invention provides comprises cabinet and front panel, and wherein cabinet is for encapsulating each module sections such as the depth signal generation module shown in above-mentioned Fig. 1-3, tension signal generation module, MMD signal generator module, signal acquisition module and energy supply control module.Front panel is used for providing user operation device, display board and analog signal output interface.
As shown in Figure 4, front panel comprises signal output interface (Signal Output), motor speed regulates interface (Speed Adjus t), display floater (Display), motor turn clockwise switch CW, motor is rotated counterclockwise switch (CCW), tension force maximum switch (TEN+), tension force minimum switch (TEN-) and MMD signaling switch (MME).
Wherein, Signal Output: the exportable analog signal of this interface;
Speed Adjust: utilize this device to regulate motor speed;
Display: can be used for display and rotate the number of turns or direct display depth value;
CW: control motor and turn clockwise;
CCW: control motor and be rotated counterclockwise;
TEN+: control to export maximum tension force, such as 10000lbs tension force;
TEN-: control to export minimum tension force, such as-10000lbs tension force;
MMD: contact switch, pressing once produces a MMD signal.
Cabinet inside can comprise the module structure as described in above-mentioned Fig. 1-3, and particularly, Fig. 5 illustrates the structure example of cabinet inside.
As shown in Figure 5, cabinet inside comprises power supply 51, power supply fan 52, motor 53, power transmission shaft 54, depth encoder 55 and circuit part (not shown).
Wherein, in this example, power supply 51 is Switching Power Supply, and it inputs 110VAC, exports as+5V ,+12V ,-12V and 24V dc source;
Power supply fan 52 dispels the heat for cabinet and power supply 51, and it is input as 12V dc source;
Motor is 110V direct current generator, and it drives depth encoder 55 to rotate;
Power transmission shaft 54 is the connector between motor 53 and depth encoder 55;
Depth encoder 55 produces depth signal PHASEA+, PHASEA-, PHASEB+ and PHASEB-.
Circuit part comprises power control part, Electric Machine Control part, rotates number of turns collecting part and signals collecting part.
Fig. 6 illustrates the circuit theory diagrams of power control part.Wherein, input ac power is 110V, the DC voltage needed for each module of outputting analog signal after rectifying and wave-filtering, high-frequency converter and tune wide square wave rectifying and wave-filtering.Preferably, this circuit comprises control circuit part, and it provides Voltage Feedback, thus obtains stable magnitude of voltage.As shown in Figure 6, this control circuit part can comprise sampler, comparator, pulse-width adjustment, reference voltage and oscillator.Fig. 7 illustrates a concrete example of the circuit of this power control part.
Fig. 8 illustrates the circuit diagram of Electric Machine Control part.In this example, be input as 110VAC power supply, gauge tap SW1 controls power supply input, by potentiometer R1 regulation output DC voltage size (controlling motor speed by regulation voltage size) after rectifier bridge D1 rectification, C1 filtering, control direct current direction (being used for controlling motor positive and inverse) through SW2 commutator again, be finally input in direct current generator.
Fig. 9 illustrates the circuit diagram rotating number of turns collecting part.The object understood for convenience, contains the Electric Machine Control partial circuit figure shown in above-mentioned Fig. 8 in this partial circuit figure.
As shown in Figure 9, electric machine rotation drives depth encoder to rotate, and the rotation skeleton of depth encoder welds one block of magnet.Adopt Hall element and ZN4896 multi-functional counter with the use of the number of turns carrying out the rotation of sampling depth encoder, so that compute depth numerical value.Hall element is a kind of magnetic field sensor made according to Hall effect.This part mainly completes the collection that depth encoder rotates the number of turns.Suppose that depth encoder often encloses that to rotate the degree of depth be 0.5 meter, then can calculate depth value by number of turns * 0.5m, utilizing this depth value to judge, whether depth transducer transfers to the depth signal of signal acquisition module accurate.
ZN4896 multi-functional counter is powered by 220VAC, produce a direct current 12VDC voltage to power to Hall element, and Hall element is arranged on directly over depth encoder dwang, whenever depth encoder drives magnet rotors through Hall element, Hall element produces in voltage pulse signal C P to a ZN4896 counter, rolling counters forward adds 1, by digital display tube display counting, such as, is presented on the display floater shown in Fig. 4.
Figure 10 illustrates the circuit diagram of signals collecting part.As shown in Figure 10, wherein, depth encoder is driven by the direct current generator of a 110VDC and rotates, and produces PHASEA1-, PHASEB1-, PHASEA1+ and PHASEB1+ signal to J2.MMD arranges switch (SW3) i.e. MMD switch, and when switch is pressed, MMD+ and MMD-produces the direct current signal of a 0.75V, presses pin6 and pin7 of DC voltage to J2 of generation at every turn, produces a MMD signal.It is third gear switch that tension force arranges switch (SW4), is defaulted as two ends and all disconnects, and when up dialling, TEN+ and TEN-produces+0.75V DC voltage to pin9 and pin8 of J2, produces a 10000lbs signal; Produce-0.75V DC voltage to pin9 and pin8 of J2 toward TEN+ and TEN-when setting aside, produce-10000lbs a signal.0.75V in figure be 24V voltage through R1 and ZD1 voltage stabilizing to 3.3V, then be divided to 0.75V through R2 and R3;-0.75V and+0.75V are similar, pass through-12V voltage generation-0.75V after voltage stabilizing and dividing potential drop.Also comprise fan section in Figure 10, it is radiator fan, the 12VDC powered operation produced by power panel.
Shown in composition graphs 4, J2 can the signal output port of connection layout 4, the MMD switch in SW3 and Fig. 4, TEN+ and TEN-in SW4 corresponding diagram 4, CW and CCW in Fig. 4 SW1 then in corresponding diagram 8.
Realize the simulation to the degree of depth, tension force and MMD ground auxiliary signal by the analogue means of wireline logging auxiliary signal, thus in troubleshooting process, do not need practical logging to drag sled and well logging squad, maintenance efficiency is high.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope of request of the present invention protection.
Claims (10)
1. an analogue means for wireline logging ground auxiliary signal, comprising:
Depth signal generation module, comprises motor and depth encoder, and depth encoder described in described driven by motor rotates, and described depth encoder produces the depth signal corresponding with rotating the number of turns, and described depth signal is transferred to signal acquisition module;
Tension signal generation module, comprise the first direct current signal and produce circuit, when described first direct current signal produces circuit pathways, produce the first direct current signal in the first range of voltage values arranged, use described first direct current signal simulation tension signal and transfer to described signal acquisition module;
Magnetic mark device MMD signal generator module, comprise the second direct current signal and produce circuit, produce the second direct current signal in the second range of voltage values arranged when described second direct current signal produces circuit pathways, use described second direct current signal simulation MMD signal and transfer to described signal acquisition module;
Described signal acquisition module, exports described depth signal, tension signal and MMD signal; And
Energy supply control module, for powering for described depth signal generation module, tension signal generation module, MMD signal generator module and signal acquisition module.
2. analogue means as claimed in claim 1, it is characterized in that, described depth signal generation module also comprises Hall element sum counter;
Described depth encoder is also included in it and rotates magnet fixing on skeleton;
Described Hall element is relative with described magnet and be fixed on outside circumference that described magnet rotors formed, and described Hall element produces the signal of telecommunication according to the change in magnetic field and transfers to described counter; Described counter determines the rotation number of turns of described depth encoder according to the described signal of telecommunication, and transfers to the display floater of described signal acquisition module.
3. analogue means as claimed in claim 1, it is characterized in that, described depth signal generation module also comprises Hall element sum counter;
Described depth encoder is also included in it and rotates magnet fixing on skeleton;
Described Hall element is relative with described magnet and be fixed on outside circumference that described magnet rotors formed, and described Hall element produces the signal of telecommunication according to the change in magnetic field and transfers to described counter; Described counter determines the rotation number of turns of described depth encoder according to the described signal of telecommunication, the degree of depth of often rotating a circle correspondence in conjunction with the described Hall element arranged obtains additional depth signal, by described additional depth Signal transmissions to the display floater of described signal acquisition module.
4. analogue means as claimed in claim 2 or claim 3, it is characterized in that, described motor is connected by dwang with described depth encoder, and described magnet is fixed on described dwang.
5. analogue means as claimed in claim 2 or claim 3, it is characterized in that, whenever described depth encoder drives described magnet rotors through described Hall element, described Hall element produces a voltage pulse signal, and described voltage pulse signal is transferred to described counter.
6. analogue means as claimed in claim 1, it is characterized in that, described first direct current signal produces circuit and comprises the first switch and second switch, produce maximum tension signal when closed, the described second switch of described first switch disconnects, produce minimum tension signal when closed, the described second switch of described first switch disconnects.
7. analogue means as claimed in claim 1, is characterized in that, described second direct current signal produces circuit and comprises contact switch, produces described MMD signal when described contact switch closes.
8. analogue means as claimed in claim 1, is characterized in that, described energy supply control module be input as alternating current, after the wide square wave rectifying and wave-filtering of rectifying and wave-filtering, high-frequency converter and tune, export DC voltage.
9. analogue means as claimed in claim 8, it is characterized in that, described energy supply control module also comprises control circuit, for providing Voltage Feedback, stablizes described DC voltage.
10. analogue means as claimed in claim 1, is characterized in that, also comprise blower module, for dispersing the heat produced in described analogue means.
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| CN201410610722.9A CN104373109B (en) | 2014-11-03 | 2014-11-03 | A kind of analogue means of wireline logging ground auxiliary signal |
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| CN201410610722.9A CN104373109B (en) | 2014-11-03 | 2014-11-03 | A kind of analogue means of wireline logging ground auxiliary signal |
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| CN105608489A (en) * | 2015-12-16 | 2016-05-25 | 中国石油天然气股份有限公司 | Hall effect-based automatic ball collecting and counting method for oil field |
| CN106771733A (en) * | 2016-12-07 | 2017-05-31 | 电子科技大学 | A kind of analogue means of multicore logging cable |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105608489A (en) * | 2015-12-16 | 2016-05-25 | 中国石油天然气股份有限公司 | Hall effect-based automatic ball collecting and counting method for oil field |
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| CN106771733A (en) * | 2016-12-07 | 2017-05-31 | 电子科技大学 | A kind of analogue means of multicore logging cable |
| CN106771733B (en) * | 2016-12-07 | 2019-06-21 | 电子科技大学 | A kind of simulator of multicore logging cable |
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Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: China Oilfield Services Limited Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee before: China Oilfield Services Limited Patentee before: China National Offshore Oil Corporation |