CN1657742A - 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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- CN1657742A CN1657742A CN 200410005527 CN200410005527A CN1657742A CN 1657742 A CN1657742 A CN 1657742A CN 200410005527 CN200410005527 CN 200410005527 CN 200410005527 A CN200410005527 A CN 200410005527A CN 1657742 A CN1657742 A CN 1657742A
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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:
After being converted to electromagnetic signal, the data that downhole sensor is recorded export;
Utilize drill string and stratum as medium with described electromagnetic signal transmission to ground;
Receive the electromagnetic signal in the described medium and the signal of telecommunication that receives handled.
The described data that downhole sensor is recorded are converted to export after the electromagnetic signal and are meant: adopt sensor that the geologic parameter of pit shaft track and drill bit place position of stratum is measured, and the data that record are carried out the processing of carrier frequency modulation, power amplification, with the signal emission output after handling.
Described drill string and the stratum of utilizing is meant described electromagnetic signal transmission as medium to ground: described electromagnetic signal is passed the electromagnetic signal channel that is made of drill string 7, stratum 29 and is transferred to ground.
Electromagnetic signal in the described medium of described reception and the electromagnetic signal that receives handled is meant: adopt current sensor, electromagnetic sensor that the telecommunications magnetic that transmits from described medium number is received, and the electromagnetic signal that receives carried out the processing of preposition amplification, signal monitoring switching, bandpass filtering, automatic gain control, demodulation, signal demodulator, digital filtering, carry out then data are outputed on the display.
Method of the present invention comprises following concrete steps:
At first, carry out the processing of carrier frequency modulation, power amplification then, the signal after handling is exported through transmitter, and the signal of emission output is electric current and carrier frequency electromagnetic wave by the data of data-interface communication rule reception by appointment from sensor pipe nipple 9;
Described 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;
Adopt current sensor and electromagnetic sensor that carrier frequency electric current and the electromagnetic wave that transmits from described carrier frequency current loop and carrier frequency electromagnetic wave passage received, and the electromagnetic signal that receives carried out the processing of preposition amplification, signal monitoring switching, bandpass filtering, automatic gain control, demodulation, signal demodulator, digital filtering, carry out data analysis then and comprise data output in being presented at.
The present invention also provides a kind of electromagnetic remote metering system of measurement while drilling, comprising: drill string 7, sensor pipe nipple 9 also comprise: silo launcher 8, ground receiving wastewater facility 4, and the electromagnetic signal channel that is made of described drill string 7 and stratum 29; Wherein:
Described sensor pipe nipple sends the downhole data that records to described silo launcher; Emission outputed to described electromagnetic signal channel after described silo launcher was converted to electromagnetic signal with downhole data; Described ground receiving wastewater facility receives the electromagnetic signal in the described electromagnetic signal channel and the electromagnetic signal that receives is handled.
Described silo launcher comprises:
Radiating circuit and emission electrode; Wherein:
Described radiating circuit is made of sensor data interface, FSK modulator, CF signal generator, power amplifier; Described emission electrode is a transmitting coil;
Described sensor data interface communication rule by appointment receives the data from the sensor pipe nipple; Produce CF signal by described carrier-fequency generator; Described FSK modulator is according to FSK modulation system 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 ground receiving wastewater facility comprises: current sensor, electromagnetic sensor, preamplifier, signal detection switch, bandpass filter, automatic gain controller, fsk demodulator, sound detector, digital filter, data processing equipment and data presentation device; Wherein:
Described current sensor receives the conductive electric current that flows through drill string and stratum, and described electromagnetic sensor receives the electromagnetic wave that passes the stratum; Described current sensor and electromagnetic sensor are given preamplifier respectively with the small-signal that receives and are amplified, and then deliver to the signal detection switch, deliver to bandpass filter 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 controller; Signal recovers data-signal through after the detection again through fsk demodulator; 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.
Described current sensor and electromagnetic sensor constitute sensor groups 21.
The mechanical assemblage characteristic of described silo launcher is: radiating circuit 16 and transmitting coil 14 are installed in the silo launcher pipe nipple 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 emitter pipe nipple in addition, top screw thread 12 connects drill string 7, and lower part screw thread 25 connects sensor and instrument pipe nipple 9.
Described radiating circuit 16 comprises: sensor data interface, and carrier-fequency generator, the FSK modulator, each function block circuit such as power amplifier is formed.
After described silo launcher pipe nipple 8 passed through tapered thread 25 and sensor pipe nipple 9 is connected, the data that sensor pipe nipple 9 is sent will be connected with the data input cable 17 of silo launcher pipe nipple 8 through cable plug 24; Stube cable is by cable retaining ring 23 and 28 protections of cable retaining ring.
The feature that described ground receiving wastewater facility and drill string and earthing pole are electrically connected is: is connected earthing electrode 5 by described ground receiving wastewater facility 4 outgoing cables 3 one ends, on another termination wellbore casing 2 and raised platform around a well or the derrick certain a bit.
Described emission electrode is meant transmitting coil 14, and transmitting coil 14 is 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
Medium shows as dielectric (insulation)
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 is the character of half dielectric (semi-insulating) now, resembles a resistance, so downhole transmitter 8, drill string 7, cable 3, geoceiver 4, earthing electrode 5, stratum 29, the shell of 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 downhole transmitter 8 will flow in this closed-loop path, pass to ground and will be received by geoceiver 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 downhole transmitter 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 geoceiver 4 receives.
A kind of em telemetry method and system (see figure 1) that is used for measurement while drilling provided by the invention, by downhole transmitter 8, drill string 7, stratum 29, ground receiving wastewater facility 4, signal cable 3, the em telemetry transmission system that earthing electrode 5 is formed.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 downhole transmitter 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 downhole transmitter 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: downhole transmitter 18; Ground receiving wastewater facility 22.
The feature of downhole transmitter 18 principle of compositionalities is (see figure 3)s: downhole transmitter 18 is by sensor data interface, carrier-fequency 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 downhole transmitter is a (see figure 2): radiating circuit 16 and transmitting coil 14 are installed in the downhole transmitter pipe nipple 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 screw thread 12 connects drill string 7, and screw thread 25 (see figure 4)s in lower part connect sensor and instrument pipe nipple 9.
The machinery of described downhole transmitter combination (see figure 3), the feature of its radiating circuit 16 is (see figure 2)s: radiating circuit 16 is by sensor data interface, carrier-fequency generator, the FSK modulation, each function block circuit such as power amplification is formed.
Described downhole transmitter pipe nipple 8 is a (see figure 4) with the feature that sensor and instrument pipe nipple 9 mechanical connections are connected with data-signal: after downhole transmitter pipe nipple 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 downhole transmitter pipe nipple 8 through cable plug 24.Stube 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 carrier-fequency 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 in downhole transmitter 8, drill string 7, and cable 3, geoceiver 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 downhole transmitter 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 conductive electric current that flows through drill string and stratum, and the TM wave sensor receives the 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 silk mouth 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 or 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 (14)
1. the em telemetry method of a measurement while drilling, comprising: to the shaft bottom data measure and the data that record are converted to electromagnetic signal after export; Utilize drill string and stratum as medium with described electromagnetic signal transmission to ground; Receive the electromagnetic signal in the described medium and the electromagnetic signal that receives handled.
2. method according to claim 1, it is characterized in that, described the shaft bottom data are measured and the data that record are converted to export after the electromagnetic signal be meant: adopt sensor that the shaft bottom data are measured, and the data that record are carried out the processing of carrier frequency modulation, power amplification, with the signal emission output after handling.
3. method according to claim 1, it is characterized in that described drill string and the stratum of utilizing is meant described electromagnetic signal transmission as medium to ground: described electromagnetic signal is passed the electromagnetic signal channel that is made of drill string (7), stratum (29) and is transferred to ground.
4. method according to claim 1, it is characterized in that, electromagnetic signal in the described medium of described reception and the electromagnetic signal that receives handled is meant: adopt current sensor, electromagnetic sensor that the electromagnetic signal that transmits from described medium is received, and the electromagnetic signal that receives carried out the processing of preposition amplification, signal monitoring switching, bandpass filtering, automatic gain control, demodulation, signal demodulator, digital filtering, carry out data analysis then and comprise data output in being presented at.
5. method according to claim 1 is characterized in that comprising following concrete steps:
Adopt sensor that the shaft bottom data are measured, and the data that record are carried out the processing of carrier frequency modulation, power amplification, the signal after handling is exported through transmitter, and the signal of emission output is carrier frequency electric current and carrier frequency electromagnetic wave;
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);
Adopt current sensor and electromagnetic sensor that carrier frequency electric current and the carrier frequency electromagnetic wave that transmits from described carrier frequency current loop and carrier frequency electromagnetic wave passage received, and carry out the processing of preposition amplification, signal monitoring switching, bandpass filtering, automatic gain control, demodulation, signal demodulator, digital filtering to the received signal, carry out data analysis then and comprise that being presented at interior data exports.
6. the electromagnetic remote metering system of a measurement while drilling is characterized in that comprising: silo launcher (8), sensor pipe nipple (9), ground receiving wastewater facility (4), and the electromagnetic signal channel that is made of described drill string (7) and stratum (29); Wherein:
Described sensor 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 electromagnetic signal in the described electromagnetic signal channel and handles to the received signal.
7. system according to claim 6 is characterized in that, described silo launcher comprises:
Radiating circuit and emission electrode; Wherein: described radiating circuit is made of sensor data interface, FSK modulator, CF signal generator, power amplifier; Described emission electrode is a transmitting coil;
Described sensor data interface communication rule by appointment receives the data from sensor; Produce CF signal by described carrier-fequency 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.
8. system according to claim 6, it is characterized in that described ground receiving wastewater facility comprises: current sensor, electromagnetic sensor, preamplifier, signal detection switch, bandpass filter, automatic gain controller, fsk demodulator, sound detector, digital filter, data processing equipment and data presentation device; Wherein:
Described current sensor receives the conductive electric current that flows through drill string and stratum, and described electromagnetic sensor receives the electromagnetic wave that passes the stratum; Described current sensor and electromagnetic sensor are given preamplifier respectively with the small-signal that receives and are amplified, and then deliver to the signal detection switch, deliver to bandpass filter 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 controller; Signal recovers data-signal through after the detection again through fsk demodulator; 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.
9. system according to claim 8 is characterized in that, described current sensor and electromagnetic sensor constitute sensor groups (21).
10. system according to claim 7, it is characterized in that, the mechanical assemblage characteristic of described silo launcher is: radiating circuit (16) and transmitting coil (14) are installed in the silo launcher pipe nipple (8), they are connected by cable (15), and a dead ring made from ceramic materials or High temp. epoxy resins (13) is housed outside transmitting coil (14); Be the tapered thread of manufacturing according to the petroleum industry standard at the two ends of emitter pipe nipple in addition, top screw thread (12) connects drill string (7), and lower part screw thread (25) connects sensor and instrument pipe nipple (9).
11. system according to claim 10 is characterized in that, described radiating circuit (16) comprising: sensor data interface, and carrier-fequency generator, the FSK modulator, each function block circuit such as power amplifier is formed.
12. system according to claim 10, it is characterized in that, after described silo launcher pipe nipple (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 passed through cable plug (24) and are connected with the data input cables (17) of silo launcher pipe nipple (8); Stube cable is by cable retaining ring (23) and cable retaining ring (28) protection.
13. system according to claim 8, described ground receiving wastewater facility with the feature that drill string and earthing electrode are connected is: connect earthing electrode (5) by described 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.
14. system according to claim 7 is characterized in that, described emission electrode is meant transmitting coil (14), and 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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| 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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2004
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