CN100513742C - Electromagnetic telemetering method and system of measuring by bit - Google Patents
Electromagnetic telemetering method and system of measuring by bit Download PDFInfo
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- CN100513742C CN100513742C CNB200410005527XA CN200410005527A CN100513742C CN 100513742 C CN100513742 C CN 100513742C CN B200410005527X A CNB200410005527X A CN B200410005527XA CN 200410005527 A CN200410005527 A CN 200410005527A CN 100513742 C CN100513742 C CN 100513742C
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Abstract
The invention relates to a electromagnetic remote measurement with drill method and its system, switching the data from the sensor to electromagnetic signal and transfering it; using the drill stem and horizon to the medium for transmitting the electromagnetic signal to the ground; receiving the electromagnetic signal in the medium and processing it using sensor to measure the geological parameter of the well curb trace and the drill stem and horizon of drill, process the data by modulation and power amplification, then transfer the signal, solving the problems existing in the present telemetry.
Description
Technical field
The present invention relates to be used for oil, the mine with the technology of em telemetry transmission downhole data, is a kind of em telemetry method and system of measurement while drilling concretely in measurement while drilling such as geological prospecting or the non-measurement while drilling borehole instruments equipment.
Background technology
Current at oil, the mine, for wellbore trace is crept into according to the engineering design requirement more accurately, and grasp formation information more promptly and accurately just need be installed in position near drill bit to orientation sensor and the sensor of gathering geological information in the drilling engineerings such as geological prospecting.These sensors are along with creeping in the down-hole of rig measured, this simultaneously sensor acquisition to data also to be real-time transmitted to ground so that make engineers and technicians in time understand the variation of the track and the formation information of pit shaft.And the process of this transmission underground survey information is commonly referred to " remote measurement ".
Remote measurement underground survey information generally has two kinds of methods in the drilling engineering, and a kind of is " wire-link telemetry method "; A kind of is " mud-pulse telemetry method "; " wire-link telemetry method " is exactly to connect measuring apparatus with an armouring single-core cable lower end to put into the down-hole drill collar by the passage of drill string, and the data that measuring apparatus obtains are transferred to ground by this root armouring single-core cable.But this method can not be used in the well greater than 45 degree in rotary drilling and hole angle.If because cable drill string rotating cable in the passage of drill string can be broken by strand, when hole angle is spent greater than 45 in addition, it will be very difficult that instrument is transferred to the shaft bottom by own wt.
About " mud-pulse telemetry method ", it is to utilize the impulse generator that is installed in the drill collar, produces compression wave in the mud in the drill string passage, is that carrier is caught data come with this compression wave.It is in the wellbore construction of medium that this method of telemetering can only be used in the conventional mud, can't transmit downhole data if be used in the under balance pressure drilling, because drilling fluid (medium) is gas or foam mud under balance pressure drilling.Gas and foam mud are compressible, and the pressure pulse that produces in this medium can cause receiving sensor can not correctly extract signal by gross distortion.So in drilling engineering, desire to make wellbore trace to creep into according to the engineering design requirement more accurately, and grasp formation information more promptly and accurately, just need be installed in the sensor of orientation sensor and collection geological information near the position of drill bit and carry out measurement while drilling, also will be transferred to ground to survey data in real time simultaneously at this.And how to solve with the underground survey data in real time be transferred to ground problem be a critical problem.
Summary of the invention
Content of the present invention is, a kind of em telemetry method and system of measurement while drilling are provided, in order to overcome the problem that exists in the existing telemetry.Being widely used in various media is to carry out measurement while drilling in the special well (as directed drilling, horizontal drilling, under balance pressure drilling etc.) of drilling fluid or the conventional drilling.Make that in drilling engineering wellbore trace requires to creep into according to engineering design more accurately, and grasp formation information more promptly and accurately, simultaneously survey data is transferred to ground in real time exactly.
Technical scheme of the present invention is: a kind of em telemetry method of measurement while drilling, comprising:
Utilize sensor and instrument pipe nipple, silo launcher, drill string, signal cable, ground receiving wastewater facility, earthing electrode and stratum to constitute the em telemetry transmission system; Adopt the sensor in sensor and the instrument pipe nipple that the shaft bottom data are measured; The data that record are carried out the processing of carrier frequency modulation, power amplification; Transmitting coil and the radiating circuit of signal after handling in silo launcher generated carrier frequency electromagnetic signal and output; Utilize drill string and stratum as medium with described carrier frequency electromagnetic signal transmission to ground; Utilize ground receiving wastewater facility to receive the carrier frequency electromagnetic signal in the described medium and the carrier frequency electromagnetic signal that receives handled.
Described transmitting coil is equipped with ceramic materials dead ring or High temp. epoxy resins dead ring outward; Described carrier frequency electromagnetic signal is carrier frequency electric current and carrier frequency electromagnetic wave; By cable, ground receiving wastewater facility one end connects earthing electrode, and certain is a bit on another termination wellbore casing and raised platform around a well or the derrick.Earthing electrode is apart from the platform 5-100 rice of derrick, and need are to perfusion ground connection conduction liquid in the stratum around the earthing electrode.
Described ground receiving wastewater facility comprises current sensor, electromagnetic sensor, describedly utilize ground receiving wastewater facility to receive the carrier frequency electromagnetic signal in the described medium and the carrier frequency electromagnetic signal that receives handled to be meant: adopt current sensor, electromagnetic sensor that the electromagnetic signal that transmits from described medium is received, current sensor receives the carrier frequency electric current that flows through drill string and stratum, and electromagnetic sensor receives the carrier frequency electromagnetic wave that passes the stratum.
The carrier frequency electromagnetic signal that receives handled comprise that the carrier frequency electromagnetic signal received of butt joint carries out the processing of preposition amplification, signal monitoring switching, bandpass filtering, automatic gain control, demodulation, signal demodulator, digital filtering.Described carrier frequency electric current transmits by the carrier frequency current loop that is made of drill string, drill bit, stratum, ground receiving wastewater facility, signal cable, earthing electrode.
Described carrier frequency electromagnetic wave transmits by the carrier frequency electromagnetic wave passage that is made of stratum, ground receiving wastewater facility.
The present invention also provides a kind of electromagnetic remote metering system of measurement while drilling, wherein, constitutes the em telemetry transmission system by sensor and instrument pipe nipple, silo launcher, drill string, signal cable, ground receiving wastewater facility, earthing electrode and stratum; Constitute electromagnetic signal channel by described drill string and stratum.Sensor in described sensor and the instrument pipe nipple sends the shaft bottom data that record to described silo launcher; Described silo launcher is modulated into CF signal with the shaft bottom data and launches after power amplification and outputs to described electromagnetic signal channel; Described ground receiving wastewater facility receives the carrier frequency electromagnetic signal in the described electromagnetic signal channel and handles to the received signal; Described carrier frequency electromagnetic signal is carrier frequency electric current and carrier frequency electromagnetic wave.
Described silo launcher has transmitting coil and radiating circuit, and this transmitting coil is equipped with a dead ring made from ceramic materials or High temp. epoxy resins outward; Described ground receiving wastewater facility comprises current sensor and electromagnetic sensor, preamplifier, signal detection switch, bandpass filter, automatic gain controller, fsk demodulator, sound detector, digital filter, data processing equipment and data presentation device; Described current sensor receives the carrier frequency electric current that flows through drill string and stratum, and described electromagnetic sensor receives the carrier frequency electromagnetic wave that passes the stratum.
Described radiating circuit is made of sensor data interface, FSK modulator, CF signal generator, power amplifier; Described sensor data interface communication rule by appointment receives the data from sensor; Produce CF signal by described CF signal generator; Described FSK modulator is according to FSK modulation system data modulated carriers signal; CF signal after the modulation is sent into described power amplifier and is amplified; Send into the signal transmitting coil through the signal of power amplification, on drill string, induce the carrier frequency curtage by transmitting coil.Described current sensor and electromagnetic sensor constitute sensor groups.The two ends of silo launcher are the tapered thread of manufacturing according to the petroleum industry standard, and top tapered thread connects drill string, and lower part tapered thread connects sensor and instrument pipe nipple.
Sensor and instrument pipe nipple are connected with the data input cable of silo launcher through cable plug; Data input cable is by cable retaining ring and the protection of cable retaining ring.Described transmitting coil is a ring bodies of being made by permeability magnetic material, is wound with coil on ring bodies.
Beneficial effect of the present invention is, by a kind of em telemetry method and system of measurement while drilling are provided, in order to overcome the problem that exists in the existing telemetry.Making it to be widely used in various media is to carry out measurement while drilling in the special well (as directed drilling, horizontal drilling, under balance pressure drilling etc.) of drilling fluid or the conventional drilling.Make that in drilling engineering wellbore trace requires to creep into according to engineering design more accurately, and grasp formation information more promptly and accurately, simultaneously survey data is transferred to ground in real time exactly.
Description of drawings
Fig. 1 is the schematic diagram of the electromagnetic remote metering system of measurement while drilling of the present invention;
Fig. 2 is the structural representation of emitter pipe nipple of the present invention;
Fig. 3 is the theory diagram of the electromagnetic remote metering system of measurement while drilling of the present invention;
Fig. 4 is the connection diagram of emitter pipe nipple of the present invention and sensor and instrument pipe nipple.
The specific embodiment
Now in conjunction with (Fig. 1) with (Fig. 2) describe the method for " em telemetry carries out measurement while drilling ".The main core of this method is to be carrier with electric current and electromagnetic wave, is medium with the transfer of data of down-hole to ground with drill string and stratum.According to the Theory of Electromagnetic Field of classics, the stratum shows different dielectric characteristics under different conditions, expresses with mathematical expression to be exactly
A.
Medium shows as dielectric (insulation)
B.
Medium shows as half dielectric (semi-insulating)
C.
Medium shows as electric conductor
Wherein:
σ-electrical conductivity;
ε-dielectric constant;
The angular frequency of electromagnetic field in ω-medium;
Ordinary circumstance sub-surface multilist now is the character of half dielectric (semi-insulating), resemble a resistance, so the shell of silo launcher 8, drill string 7, cable 3, ground receiving wastewater facility 4, earthing electrode 5, stratum 29, drill bit 10 and sensor and instrument pipe nipple 9 just constitutes the closed-loop path (see figure 1) of a series connection.Therefore the carrier frequency electric current 6 that sends of silo launcher 8 will flow in this closed-loop path, pass to ground and will be received by ground receiving wastewater facility being modulated at downhole data on the carrier frequency electric current.
If the carrier frequency electric current 6 in the very big loop at this moment of formation resistivity will become very little, this moment silo launcher 8, drill string 7, drill bit 10 and sensor and instrument pipe nipple 9 just constitute the long electric dipole of a unequal arm and give off electromagnetic wave to the stratum, and the electromagnetic wave that passes stratum 29 will be that the TM wave sensor in the ground receiving wastewater facility 4 receives.
A kind of em telemetry method and system (see figure 1) that is used for measurement while drilling provided by the invention is formed the em telemetry transmission system by silo launcher 8, drill string 7, stratum 29, ground receiving wastewater facility 4, signal cable 3, earthing electrode 5.Send the electric current 6 and the electromagnetic wave 11 (being also referred to as carrier frequency electric current or carrier frequency electromagnetic wave) of a certain frequency by silo launcher 8, the electromagnetic signal channel that constitutes by drill string 7 and stratum 29 is transferred to ground, receive by ground receiving wastewater facility (4) again, thereby finish the downhole data real-time communication.
The feature of silo launcher 8 is: the (see figure 1) carrier frequency electric current 6 of emission or carrier frequency electromagnetic wave 11 are produced by (see figure 2) radiating circuit 16 and transmitting coil 14.Carrier frequency electric current 6 or carrier frequency electromagnetic wave 11 (TM ripple) that Using such method produces pass drill string, drill bit, and the stratum arrives ground.
The method that described carrier frequency electric current or carrier frequency electromagnetic wave produce, the channel characteristics that underground signal is transferred to ground is a (see figure 1):
1. drill string 7, drill bit 10, and stratum 29, ground receiving wastewater facility 4, signal cable 3, earthing electrode 5 has constituted the carrier frequency current loop;
2. the stratum 29, and ground receiving wastewater facility 4 has constituted carrier frequency electromagnetic wave (TM ripple) passage.
The method of received signal is finished by ground receiving wastewater facility, and electric current receiving sensor and electromagnetic wave (TM ripple) receiving sensor is arranged in ground receiving wastewater facility.
Realize that the feature that em telemetry method system constitutes is: see (Fig. 3) theory diagram, this system mainly is made up of two parts: silo launcher 18; Ground receiving wastewater facility 22.
The feature of silo launcher 18 principle of compositionalities is (see figure 3)s: silo launcher 18 is by sensor data interface, the CF signal generator, and the FSK modulation, power amplification, signal projector and emission electrode (antenna) 19 formed.
The feature of ground receiving wastewater facility 22 principle of compositionalities is: (see figure 3), ground receiving wastewater facility 22 be by sensor groups 21, preposition amplification, signal detection change-over switch, bandpass filtering, automatic gain control, FSK demodulation, signal demodulator, digital filtering, compositions such as data processing and data demonstration.
The composition characteristic of sensor groups 21 is (see figure 3)s: sensor groups 21 is made up of electric current receiving sensor and electromagnetic wave (TM ripple) receiving sensor.
The mechanical assemblage characteristic of silo launcher is a (see figure 2): radiating circuit 16 and transmitting coil 14 are installed in the silo launcher 8, they are connected by cable 15, and a dead ring 13 made from ceramic materials or High temp. epoxy resins is housed outside transmitting coil 14; Be the tapered thread of manufacturing according to the petroleum industry standard at the two ends of transmitter pipe nipple in addition, top tapered thread 12 connects drill string 7, and tapered thread 25 (see figure 4)s in lower part connect sensor and instrument pipe nipple 9.
The machinery of described silo launcher combination (see figure 3), the feature of its radiating circuit 16 is (see figure 2)s: radiating circuit 16 is by sensor data interface, the CF signal generator, the FSK modulation, each function block circuit such as power amplification is formed.
Described silo launcher 8 is a (see figure 4) with the feature that sensor and instrument pipe nipple 9 mechanical connections are connected with data-signal: after silo launcher 8 passed through tapered thread 25 and sensor and instrument pipe nipple 9 are connected, the data that sensor and instrument pipe nipple 9 are sent will be connected with the data input cable 17 of silo launcher 8 through cable plug 24.Data input cable prevents the erosion damage of mud and landwaste by 23,28 protections of cable retaining ring.
Described ground receives the method for underground signal, ground receiving wastewater facility and drill string, the feature that earthing pole is electrically connected is a (see figure 1): connect earthing electrode 5 by ground receiving wastewater facility outgoing cable 3 one ends, certain is a bit on another termination wellbore casing 2 and raised platform around a well or the derrick.
Transmitting coil 14 is characterised in that: transmitting coil 14 is ring bodies of being made by permeability magnetic material, is wound with coil on ring bodies.
The detailed process that em telemetry transmits and receives is described below:
One, emission process (see figure 3):
By the data of data-interface communication rule reception by appointment from sensor and instrument pipe nipple;
Produce CF signal by the CF signal generator;
From the data of data-interface according to modulation system modulated carriers signal;
CF signal after the modulation is sent into power amplifier and is amplified;
Send into signal projector (transmitting coil) through the signal of power amplification and be also referred to as emission electrode, on drill string, induce the carrier frequency curtage by transmitting coil.
Two, transmission course (see figure 1):
If formation resistivity is not high, the carrier frequency electric current is at silo launcher 8, drill string 7, and cable 3, ground receiving wastewater facility 4, earthing electrode 5, stratum 29, the shell of drill bit 10 and sensor and instrument pipe nipple 9 just constitutes in the closed-loop path and flows;
If formation resistivity is very high, the carrier frequency electric current will become very little in the drill string, and be played a major role in transmission by the carrier frequency electromagnetic wave that silo launcher 8 gives off.
Three, receiving course (see figure 3):
It is current sensors that one of two sensor are arranged in ground receiving wastewater facility, and one is electromagnetic sensor (TM ripple) sensor.Their effect is: current sensor can receive the carrier frequency electric current that flows through drill string and stratum, and the TM wave sensor receives the carrier frequency electromagnetic wave that passes the stratum;
Two sensors are given preamplifier respectively with the small-signal that receives and are amplified, and then deliver to the signal detection switch, deliver to bandpass filtering through road signal that will be stronger after relatively;
Signal makes signal obtain preliminary arrangement through the noise signal of removing outside the bandwidth behind the bandpass filtering;
Filtered signal is given automatic gain control, the purpose of using automatic gain control be cause signal for anti-stop signal is excessive cut the top distortion;
Signal recovers data-signal through after the detection again through the FSK demodulation;
In the process that signal transmits, might be subjected to and the CF signal co-channel interference, might incompleteness not put in order through separating the data-signal that recovers after the mediation detection, so must pass through digital filtering again to the further shaping of data;
Data behind the digital filtering are delivered to display screen through relevant treatment and are shown.
The embodiment that the present invention uses is:
1) (see figure 4) at first will be launched pipe nipple 8 and be connected by screw thread 25 with sensor and instrument pipe nipple 9; Cable with sensor and instrument pipe nipple connects by plug 24 with the cable of launching pipe nipple then; And then cable retaining ring 23,28 is installed, cable and plug are encased.
2) upper end and the drill string that will launch pipe nipple 8 connects.
3) drill bit is contained in the lower end of sensor and instrument pipe nipple 9, installs the lower end that Other Instruments or instrument also be contained in sensor and instrument pipe nipple additional as need and refill drill bit then.
4) (see figure 1) treat drill string transfer to behind the shaft bottom cable 3 connected on wellbore casings 2 and raised platform around a well or the derrick certain a bit on.
5) (see figure 1) is driven underground earthing electrode 5, and earthing electrode is apart from the about 5-100 rice of the platform of derrick 1.
6) at earthing electrode circumfusion ground connection conduction liquid, as the full salt solution that closes.
7) (see figure 1) is connected cable 3 with ground receiving wastewater facility and earthing electrode.
8) open the ground receiving wastewater facility power supply and receive underground signal.
Beneficial effect of the present invention is, by a kind of em telemetry method and system of measurement while drilling are provided, in order to overcome the problem that exists in the existing telemetry.Making it to be widely used in various media is to carry out measurement while drilling in the special well (as directed drilling, horizontal drilling, under balance pressure drilling etc.) of drilling fluid or the conventional drilling.Make that in drilling engineering wellbore trace requires to creep into according to engineering design more accurately, and grasp formation information more promptly and accurately, simultaneously survey data is transferred to ground in real time exactly.
The above specific embodiment only is used to the present invention is described but not is used to limit the present invention.
Claims (9)
1. the em telemetry method of a measurement while drilling, comprising:
Utilize sensor and instrument pipe nipple (9), silo launcher (8), drill string (7), signal cable (3), ground receiving wastewater facility (4), earthing electrode (5) and stratum (29) formation em telemetry transmission system;
Adopt the sensor in sensor and the instrument pipe nipple (9) that the shaft bottom data are measured;
The data that record are carried out the processing of carrier frequency modulation, power amplification;
Transmitting coil and the radiating circuit of signal after handling in silo launcher generated carrier frequency electromagnetic signal and output; Utilize drill string and stratum as medium with described carrier frequency electromagnetic signal transmission to ground;
Utilize ground receiving wastewater facility to receive the carrier frequency electromagnetic signal in the described medium and the carrier frequency electromagnetic signal that receives handled;
Wherein:
Described transmitting coil is equipped with ceramic materials dead ring or High temp. epoxy resins dead ring outward;
Described carrier frequency electromagnetic signal is carrier frequency electric current and carrier frequency electromagnetic wave;
By cable (3), ground receiving wastewater facility (4) one ends connect earthing electrode (5), and certain is a bit on another termination wellbore casing (2) and raised platform around a well or the derrick;
Earthing electrode is apart from the platform 5-100 rice of derrick (1), and need are to perfusion ground connection conduction liquid in earthing electrode (5) stratum on every side;
Described ground receiving wastewater facility comprises current sensor, electromagnetic sensor, describedly utilize ground receiving wastewater facility to receive the carrier frequency electromagnetic signal in the described medium and the carrier frequency electromagnetic signal that receives handled to be meant: adopt current sensor, electromagnetic sensor that the electromagnetic signal that transmits from described medium is received, current sensor receives the carrier frequency electric current that flows through drill string and stratum, and electromagnetic sensor receives the carrier frequency electromagnetic wave that passes the stratum.
2. method according to claim 1, it is characterized in that, the carrier frequency electromagnetic signal that receives is handled comprised that the carrier frequency electromagnetic signal received of butt joint carries out the processing of preposition amplification, signal monitoring switching, bandpass filtering, automatic gain control, demodulation, signal demodulator, digital filtering.
3. method according to claim 1 and 2, it is characterized in that described carrier frequency electric current transmits by the carrier frequency current loop that is made of drill string (7), drill bit (10), stratum (29), ground receiving wastewater facility (4), signal cable (3), earthing electrode (5);
Described carrier frequency electromagnetic wave transmits by the carrier frequency electromagnetic wave passage that is made of stratum (29), ground receiving wastewater facility (4).
4. the electromagnetic remote metering system of a measurement while drilling, it is characterized in that, by sensor and instrument pipe nipple (9), silo launcher (8), drill string (7), signal cable (3), ground receiving wastewater facility (4), earthing electrode (5) and stratum (29) formation em telemetry transmission system; Constitute electromagnetic signal channel by described drill string (7) and stratum (29); Wherein:
Sensor in described sensor and the instrument pipe nipple (9) sends the shaft bottom data that record to described silo launcher; Described silo launcher is modulated into CF signal with the shaft bottom data and launches after power amplification and outputs to described electromagnetic signal channel; Described ground receiving wastewater facility receives the carrier frequency electromagnetic signal in the described electromagnetic signal channel and handles to the received signal; Described carrier frequency electromagnetic signal is carrier frequency electric current and carrier frequency electromagnetic wave;
Described silo launcher has transmitting coil (14) and radiating circuit (16), the outer dead ring made from ceramic materials or High temp. epoxy resins (13) that is equipped with of this transmitting coil (14);
By cable (3), ground receiving wastewater facility (4) one ends connect earthing electrode (5), and certain is a bit on another termination wellbore casing (2) and raised platform around a well or the derrick;
Described ground receiving wastewater facility (4) comprises current sensor and electromagnetic sensor, preamplifier, signal detection switch, bandpass filter, automatic gain controller, fsk demodulator, sound detector, digital filter, data processing equipment and data presentation device; Described current sensor receives the carrier frequency electric current that flows through drill string and stratum, and described electromagnetic sensor receives the carrier frequency electromagnetic wave that passes the stratum;
Earthing electrode is apart from the platform 5-100 rice of derrick (1), and need are to perfusion ground connection conduction liquid in earthing electrode (5) stratum on every side.
5. system according to claim 4 is characterized in that, described radiating circuit is made of sensor data interface, FSK modulator, CF signal generator, power amplifier;
Described sensor data interface communication rule by appointment receives the data from sensor; Produce CF signal by described CF signal generator; Described FSK modulator is according to FSK modulation system data modulated carriers signal; CF signal after the modulation is sent into described power amplifier and is amplified; Send into the signal transmitting coil through the signal of power amplification, on drill string, induce the carrier frequency curtage by transmitting coil.
6. system according to claim 4 is characterized in that, described current sensor and electromagnetic sensor constitute sensor groups (21).
7. system according to claim 6, it is characterized in that, the two ends of silo launcher are the tapered thread of manufacturing according to the petroleum industry standard, and top tapered thread (12) connects drill string (7), and lower part tapered thread (25) connects sensor and instrument pipe nipple (9).
8. system according to claim 7 is characterized in that, sensor and instrument pipe nipple (9) are connected with the data input cables (17) of silo launcher (8) through cable plug (24); Data input cable is protected by cable retaining ring (23,28).
9. system according to claim 4 is characterized in that, described transmitting coil (14) is a ring bodies of being made by permeability magnetic material, is wound with coil on ring bodies.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB200410005527XA CN100513742C (en) | 2004-02-16 | 2004-02-16 | Electromagnetic telemetering method and system of measuring by bit |
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| CNB200410005527XA CN100513742C (en) | 2004-02-16 | 2004-02-16 | Electromagnetic telemetering method and system of measuring by bit |
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| CN100513742C true CN100513742C (en) | 2009-07-15 |
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| CN108756863A (en) * | 2018-04-18 | 2018-11-06 | 中国地质大学（武汉） | A method of improving electromagnetic measurement while drilling signal transmission distance using becket |
| CN111456724B (en) * | 2020-03-27 | 2021-11-19 | 华中科技大学 | Automatic tuning type underground wireless signal transmission system |
| CN111641574A (en) | 2020-05-14 | 2020-09-08 | 中国科学院地质与地球物理研究所 | Electrode type near-bit wireless short-transmission modulation method and device |
| CN111677496B (en) * | 2020-06-17 | 2023-11-17 | 中国煤炭地质总局第一勘探局 | Underground electromagnetic wave logging while drilling instrument for coal mine |
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2004
- 2004-02-16 CN CNB200410005527XA patent/CN100513742C/en not_active Expired - Fee Related
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| CN1657742A (en) | 2005-08-24 |
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