CN102937022A - System, device and method for transmitting near-bit drilling signals - Google Patents
System, device and method for transmitting near-bit drilling signals Download PDFInfo
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- CN102937022A CN102937022A CN2012104582591A CN201210458259A CN102937022A CN 102937022 A CN102937022 A CN 102937022A CN 2012104582591 A CN2012104582591 A CN 2012104582591A CN 201210458259 A CN201210458259 A CN 201210458259A CN 102937022 A CN102937022 A CN 102937022A
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Abstract
The invention provides a system, a device and a method for transmitting near-bit drilling signals. The system comprises a drilling sensor, a sender, a receiver and a measuring instrument while drilling, wherein the drilling sensor is packaged in a non-magnetic drill collar arranged between a power drilling tool and a drill and used for measuring drilling track parameter information and sending the information to the sender; the sender is packaged in the non-magnetic drill collar arranged between the power drilling tool and the drill, connected with the drilling sensor, and used for generating an alternating magnetic field according to the drilling track parameter information; the receiver is arranged at the end of the power drilling tool close to the measuring instrument while drilling, used for generating induced current signals by using the alternating magnetic field, and obtaining the drilling track parameter information according to the induced current signals and sending the information to the measuring instrument while drilling; and the measuring instrument while drilling is arranged between the power drilling tool and the ground and used for sending the drilling track parameter information to a ground receiver. According to the system, the device and the method, the drilling track parameter information collected by the drilling sensor is sent to the measuring instrument while drilling in the transmission mode in which the transmission channel is stable, the transmission rate is high and the bit error ratio is low.
Description
Technical field
The present invention relates to the production technique fields such as oil, natural gas and coal bed gas, particularly, relate to a kind of nearly bit drills log signal transmission system, Apparatus and method for.
Background technology
In the directed drilling construction of oil, natural gas and coal bed gas etc., obtain the wellbore trace parameter most important to the construction success or not, the geological environment that faces along with present drilling well industry becomes increasingly complex, and the control accuracy of wellbore trace requires also day by day to improve.
In the drilling process, wellbore trace parameter major embodiment is the data such as the hole angle, azimuth of drill bit position place well, generally adopt at present measurement while-drilling instrument (Measure While Drilling, be called for short MWD) measurement wellbore trace parameter, but because the directed drilling construction need to be used power drilling tool, and measurement while-drilling instrument and drill bit are separately positioned on the two ends of power drilling tool (generally being about tens meters), so measurement while-drilling instrument can not directly obtain the data such as place, drill bit position hole angle, azimuth.In order to address this problem, be everlasting at present and between power drilling tool and the drill bit non magnetic drill collar be set, and device is specifically designed to measurement drill bit position hole angle and the isoparametric drilling well sensor in azimuth therein, then send the data of drilling well sensor collection to steering tool by nearly bit drills log signal transmission system, by steering tool image data is transferred to geoceiver again.
At present, nearly bit signal transmission system signal transmission form commonly used mainly is divided into two kinds of wire transmission and wireless transmission, wherein, wire transmission mode need to be buried cable underground to connect drilling well sensor and steering tool at the power drilling tool fluting, but this transmission means can affect the mechanical strength of power drilling tool, and the spinning precision that respectively saves in the power drilling tool between the drill string had higher requirements, implementation cost is very high; Wireless transmission method adopts the electromagnetic transmission signal mostly, i.e. winding around on non magnetic drill collar, to send electromagnetic wave signal through coil behind the Data Modulation of drilling well sensor collection, electromagnetic wave signal receives and is transferred to measurement while-drilling instrument by reception antenna after striding across power drilling tool, last measurement while-drilling instrument obtains the wellbore trace parameter information by the demodulation electromagnetic wave signal, the message transmission rate of this transmission course is generally 10bits/s, transmission range is generally 10m ~ 20m, stratum and drilling fluid (high salinity stratum production fluid near this transmission course easily is subjected to, have than the forceful electric power conductance) impact, cause the electromagnetic wave signal transmission channel unstable, transfer rate is low and the bit error rate is higher.
Summary of the invention
The main purpose of the embodiment of the invention is to provide a kind of nearly bit drills log signal transmission system, Apparatus and method for, to solve the problem that nearly bit signal transmission system implementation cost is high or channel is unstable, path loss is large, transfer rate is low and the bit error rate is higher of prior art.
To achieve these goals, the embodiment of the invention provides a kind of nearly bit drills log signal transmission system, comprising: drilling well sensor, emitter, receiver and measurement while-drilling instrument; Wherein,
The drilling well sensor, the non magnetic drill collar that is packaged between power drilling tool and the drill bit is inner, is used for measuring the wellbore trace parameter information and sending to described emitter;
Emitter, the non magnetic drill collar that is packaged between power drilling tool and the drill bit is inner, is connected with described drilling well sensor, is used for producing alternating magnetic field according to described wellbore trace parameter information;
Receiver is arranged at the power drilling tool end near measurement while-drilling instrument, is used for utilizing described alternating magnetic field to produce sensor current signal, obtains the wellbore trace parameter information and sends to described measurement while-drilling instrument according to described sensor current signal;
Measurement while-drilling instrument is arranged between power drilling tool and the ground, is used for described wellbore trace parameter information is sent to geoceiver.
A kind of nearly bit drills log signal transmission equipment comprises: transmitter and receiver; Wherein,
Emitter is packaged in the non magnetic drill collar that is arranged between power drilling tool and the drill bit inner, is connected with the drilling well sensor, is used for receiving the wellbore trace parameter information that described drilling well sensor sends, and produces alternating magnetic field according to described wellbore trace parameter information;
Receiver, be arranged at the power drilling tool end near measurement while-drilling instrument, be used for utilizing described alternating magnetic field to produce sensor current signal, obtain described wellbore trace parameter information according to described sensor current signal, and the described wellbore trace parameter information that obtains is sent to measurement while-drilling instrument.
Preferably, described emitter specifically comprises: the first data-interface, modulating apparatus, control device, motor and magnet; Wherein,
The first data-interface is used for receiving the wellbore trace parameter information of drilling well sensor transmission and sending to described modulating apparatus;
Modulating apparatus connects described the first data-interface, is used for that described wellbore trace parameter information is carried out modulation treatment and obtains modulation signal, and described modulation signal is sent to control device;
Control device connects described modulating apparatus, is used for controlling described motor rotation according to described modulation signal;
Motor is fixedly connected with described magnet, is used for driving described magnet rotation;
Magnet is used for producing alternating magnetic field by rotation.
Preferably, described magnet is permanent magnet.
Preferably, described receiver specifically comprises: coil, amplifier, wave filter, signal demodulating equipment, the second data-interface; Wherein,
Coil is wound in outside the drill string of described power drilling tool end, is used for producing sensor current signal according to described alternating magnetic field;
Amplifier connects described coil, is used for described sensor current signal is amplified processing;
Wave filter connects described amplifier, is used for the sensor current signal that amplifies after processing is carried out the filtering processing;
Signal demodulating equipment connects described wave filter, is used for that the sensor current signal after the filtering processing is carried out rectification and processes to obtain the wellbore trace parameter information;
The second data-interface connects respectively described signal demodulating equipment and measurement while-drilling instrument, is used for the described wellbore trace parameter information that obtains is sent to described measurement while-drilling instrument.
A kind of nearly bit drills log signal transmission method comprises:
Emitter receives the wellbore trace parameter information that the drilling well sensor sends, and produces alternating magnetic field according to described wellbore trace parameter information, and the non magnetic drill collar that described emitter is packaged between power drilling tool and the drill bit is inner;
Receiver utilizes described alternating magnetic field to produce sensor current signal, obtains the wellbore trace parameter information and sends to measurement while-drilling instrument according to described sensor current signal, and described receiver is arranged at the power drilling tool end near measurement while-drilling instrument.
Preferably, produce alternating magnetic field according to described wellbore trace parameter information, specifically comprise:
Described wellbore trace parameter information is carried out modulation treatment, obtain modulation signal;
According to described modulation signal, controlling magnet rotates to produce alternating magnetic field.
Preferably, described wellbore trace parameter information is carried out modulation treatment, be specially: described wellbore trace parameter information is carried out two-phase PSK 2PSK modulation treatment.
Preferably, controlling magnet rotates to produce alternating magnetic field, is specially:
Control the direction of described magnet rotation; And/or,
Control the speed of described magnet rotation; And/or,
Controlling described magnet begins or stops the rotation.
By means of technique scheme, the present invention is based on electromagnetic induction principle, by near the emitter of the drill bit wellbore trace parameter generating alternating magnetic field after according to modulation, utilize the drill string of power drilling tool to converge the magnetic line of force of described alternating magnetic field, produce sensor current signal by the receiver near measurement while-drilling instrument according to alternating magnetic field, and obtain the wellbore trace parameter information according to sensor current signal, mode than available technology adopting cable transmission signal, the embodiment of the invention need to not buried cable underground at the power drilling tool fluting, can not affect the mechanical strength of power drilling tool, mode than available technology adopting electromagnetic transmission signal, near the impact of stratum and the drilling fluid transmission course of the embodiment of the invention can not be subjected to, transmission channel is stable, transmission range is long, transfer rate is high and the bit error rate is low.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the accompanying drawing of required use was done to introduce simply during the below will describe embodiment, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the nearly bit drills log signal transmission system that provides of the embodiment of the invention one;
Fig. 2 is the structural representation of the nearly bit drills log signal transmission equipment that provides of the embodiment of the invention two;
Fig. 3 is the structural representation of the emitter that provides of the embodiment of the invention two;
Fig. 4 is the structural representation of the receiver that provides of the embodiment of the invention two;
Fig. 5 is the alternating magnetic field magnetic line of force distribution schematic diagram that the embodiment of the invention two provides;
Fig. 6 is the nearly bit drills log signal transmission method flow chart that the embodiment of the invention three provides;
Fig. 7 is the method flow diagram according to wellbore trace parameter information generation alternating magnetic field that the embodiment of the invention three provides.
The specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
It is pointed out that said wellbore trace parameter information in the embodiment of the invention refers to the data messages such as the hole angle, azimuth of place, drill bit position well.
Implementation cost is high, channel is unstable, path loss is large, transfer rate is low and the more high defective of the bit error rate in view of existing nearly bit signal transmission system has, the embodiment of the invention provides a kind of nearly bit drills log signal transmission system, Apparatus and method for, stable by transmission channel in order to realize, as without multipath loss, transfer rate is high and the bit error rate is low transmission means the wellbore trace parameter information of drilling well sensor collection to be sent to measurement while-drilling instrument purpose.The present invention is described in detail below in conjunction with accompanying drawing.
Embodiment one
The present embodiment provides a kind of nearly bit drills log signal transmission system, and as shown in Figure 1, this nearly bit drills log signal transmission system comprises: drilling well sensor 11, emitter 12, receiver 13 and measurement while-drilling instrument 14; Wherein,
Drilling well sensor 11, the non magnetic drill collar that is packaged between power drilling tool and the drill bit is inner, is used for measuring the wellbore trace parameter information and sending to described emitter 12;
Measurement while-drilling instrument 14 is arranged between power drilling tool and the ground, is used for described wellbore trace parameter information is sent to geoceiver.
Concrete, as shown in Figure 1, the non magnetic drill collar that drilling well sensor 11 and emitter 12 are packaged between power drilling tool and the drill bit is inner, namely near the drill bit setting; Receiver 13 is arranged at the end of power drilling tool, and arranges near measurement while-drilling instrument 14; The present embodiment is arranged at emitter 12 and receiver 13 respectively the two ends of power drilling tool, and utilize emitter 12 to produce alternating magnetic field, utilize the drill string (having high magnetic permeability) of power drilling tool to converge the magnetic line of force of described alternating magnetic field, and the mode of utilizing receiver 13 to produce sensor current signal is transferred to measurement while-drilling instrument 14 with the wellbore trace parameter information that drilling well sensor 11 gathers.
The signal transmission rate of the nearly bit drills log signal transmission system that the present embodiment provides can reach 20bits/s, transmission range can reach 20m, satisfy striding across power drilling tool fully, the wellbore trace parameter information of drilling well sensor 11 collections is transferred to the purpose of measurement while-drilling instrument 14.Nearly bit drills log signal transmission system than available technology adopting cable transmission signal, the present embodiment need to not buried cable underground at the power drilling tool fluting, can not affect the mechanical strength of power drilling tool, nearly bit drills log signal transmission system than available technology adopting electromagnetic transmission signal, near the impact of stratum and drilling fluid the present embodiment can not be subjected to, transmission channel is stable, without the multipath loss, transfer rate is high and the bit error rate is low.
Embodiment two
The present embodiment provides a kind of nearly bit drills log signal transmission equipment, and as shown in Figure 2, this equipment comprises: emitter 21 and receiver 22; Wherein,
Concrete, the present embodiment is packaged in non magnetic drill collar inside with emitter 21, with the magnetic field of avoiding power drilling tool and drill bit to be produced the alternating magnetic field that produces in the present embodiment is caused harmful effect, emitter 21 is connected with the drilling well sensor that is arranged at equally non magnetic drill collar inside, be used for receiving the wellbore trace parameter information that the drilling well sensor gathers, and according to wellbore trace parameter information generation alternating magnetic field, the magnetic line of force changes in distribution situation of the alternating magnetic field that therefore, produces itself has namely characterized the wellbore trace parameter information;
The present embodiment is arranged at receiver 22 the power drilling tool end of close measurement while-drilling instrument, namely be arranged at an end of close measurement while-drilling instrument in the power drilling tool two ends, be used for producing sensor current signal according to the alternating magnetic field that emitter 21 produces, because the magnetic line of force changes in distribution situation of described alternating magnetic field itself has characterized the wellbore trace parameter information, the sensor current signal that produces based on electromagnetic induction principle has also characterized the wellbore trace parameter information, so receiver 22 can obtain the wellbore trace parameter information and send to measurement while-drilling instrument according to described sensor current signal.
Preferably, as shown in Figure 3, described emitter 21 specifically comprises: the first data-interface 211, modulating apparatus 212, control device 213, motor 214 and magnet 215; Wherein,
The first data-interface 211 is used for receiving the wellbore trace parameter information of drilling well sensor transmission and sending to described modulating apparatus 212;
Modulating apparatus 212 connects described the first data-interface 211, is used for that described wellbore trace parameter information is carried out modulation treatment and obtains modulation signal, and described modulation signal is sent to described control device 213;
Control device 213 connects described modulating apparatus 212, is used for controlling described motor 214 rotations according to described modulation signal;
Motor 214 is fixedly connected with described magnet 215, is used for driving described magnet 215 rotations;
Magnet 215 is used for producing alternating magnetic field by rotation.
Concrete, according to the needs of information modulation treatment, described magnet 215 can be set for one or more, remove to characterize the wellbore trace parameter information to produce one or more alternating magnetic fields; During actual enforcement, although magnet 215 numbers that adopt are more, the information of transmitting is more accurate, speed is also higher, but consider and should not allow information modulating device factor data complex disposal process in the high-temperature work environment of down-hole and produce more heat, therefore the number of magnet 215 need rationally be set, both reach certain communication precision, transmission speed, the heat of guarantee information modulating device generation is less again.
Preferably, the magnet 215 that uses in the present embodiment is permanent magnet 215.
Concrete, because the magnetic field situation of down-hole is complicated, disturb more, can experience the stronger alternating magnetic field of magnetic field intensity in order to ensure receiver in the present embodiment 22, avoid simultaneously using the power consumption that electromagnet 215 brings and give birth to heat and wait ill effect, adopt permanent magnet 215 generation alternating magnetic fields in the present embodiment.
Preferably, as shown in Figure 4, described receiver 22 specifically comprises: coil 221, amplifier 222, wave filter 223, signal demodulating equipment 224, the second data-interface 225; Wherein,
The second data-interface 225 connects respectively described signal demodulating equipment 224 and measurement while-drilling instrument, is used for the described wellbore trace parameter information that obtains is sent to described measurement while-drilling instrument.
Concrete, Figure 5 shows that the magnetic line of force distribution schematic diagram of alternating magnetic field, drill string is ferromagnetic material, has high magnetic permeability, the line of magnetic induction of the alternating magnetic field that emitter 21 is produced has the effect of converging; Power drilling tool is connected to form by a plurality of drill strings, the present embodiment is wound in coil 221 in the drill string outside of power drilling tool end, and near the measurement while-drilling instrument setting, magnetic flux in the area that coil 221 surrounds can be followed the variation of alternating magnetic field and be changed, also just can produce the induced electromotive force and the sensor current signal that change along with alternating magnetic field, this sensor current signal has characterized the situation of change of alternating magnetic field, has also just characterized the wellbore trace parameter information;
Because there is multiple magnetic field (such as the magnetic field that produces in earth's magnetic field, power drilling tool or the drill bit course of work etc.) in subsurface environment, the magnetic line of force that various magnetic fields produce might cause that all electromagnetic induction occurs coil 221, and then generation interfering signal, wave filter 223 is set with these interfering signals of filtering in the present embodiment, to obtain truly to reflect the sensor current signal of alternating magnetic field situation of change;
In the present embodiment, adopt the sensor current signal after 224 pairs of filtering of signal demodulating equipment are processed to carry out the rectification processing, to obtain the wellbore trace parameter information, rectification that this signal demodulating equipment 224 is done is processed should be corresponding with the modulation treatment that modulating apparatus 212 in the emitter 21 is done, to obtain and the original wellbore trace parameter information consistent information of trying one's best.
Embodiment three
The present embodiment provides a kind of nearly bit drills log signal transmission method, and as shown in Figure 6, the method comprises:
Step S61, emitter receives the wellbore trace parameter information that the drilling well sensor sends, and produces alternating magnetic field according to described wellbore trace parameter information, and the non magnetic drill collar that described emitter is packaged between power drilling tool and the drill bit is inner;
Step S62, receiver utilize described alternating magnetic field to produce sensor current signal, obtain the wellbore trace parameter information and send to measurement while-drilling instrument according to described sensor current signal, and described receiver is arranged at the power drilling tool end near measurement while-drilling instrument.
The present embodiment is based on electromagnetic induction principle, by near the emitter of the drill bit wellbore trace parameter generating alternating magnetic field after according to modulation, utilize the drill string of power drilling tool to converge the magnetic line of force of described alternating magnetic field, produce sensor current signal by the receiver near measurement while-drilling instrument according to alternating magnetic field, and obtain the wellbore trace parameter information according to sensor current signal, mode than available technology adopting cable transmission signal, the embodiment of the invention need to not buried cable underground at the power drilling tool fluting, can not affect the mechanical strength of power drilling tool, mode than available technology adopting electromagnetic transmission signal, near the impact of stratum and the drilling fluid transmission course of the present embodiment can not be subjected to, transmission channel is stable, transmission range is long, transfer rate is high and the bit error rate is low.
Preferably, as shown in Figure 7, produce alternating magnetic field according to described wellbore trace parameter information among the above-mentioned steps S61, specifically comprise:
Step S71 carries out modulation treatment to described wellbore trace parameter information, obtains modulation signal;
Step S72, according to described modulation signal, controlling magnet rotates to produce alternating magnetic field.
Concrete, after the wellbore trace parameter information carried out modulation treatment, the modulation signal that can obtain to characterize the wellbore trace parameter information and have the simple form of expression was when utilizing this modulation signal controlling magnet rotation, the magnetic field that magnet produces alternately changes, and has also just formed alternating magnetic field.
Preferably, among the above-mentioned steps S71, described wellbore trace parameter information is carried out modulation treatment, be specially: described wellbore trace parameter information is carried out two-phase PSK (Binary Phase Shift Keying is called for short 2PSK) modulation treatment.
Concrete, after according to the 2PSK modulation system described wellbore trace parameter information being carried out modulation treatment, the modulation signal that obtains is binary coding information, the coded message that is namely formed by " 0 " or " 1 ", this modulation treatment algorithm is simple, can not produce amount of heat because algorithm is complicated when the modulating apparatus of emitter adopts the 2PSK modulation system, be conducive to the down-hole high-temperature operation.
Preferably, among the above-mentioned steps S72, controlling magnet rotates to produce alternating magnetic field, is specially:
Control the direction of described magnet rotation; And/or,
Control the speed of described magnet rotation; And/or,
Controlling described magnet begins or stops the rotation.
Concrete, the present embodiment both can adopt the modes such as whether independent controlling magnet direction of rotation, magnet rotary speed, magnet rotate to produce alternating magnetic field, also can adopt above-mentioned two or three mode of mixing to produce alternating magnetic field, but consider down-hole hot environment operation, the control device of guaranteeing emitter can not produce because control procedure is complicated higher heat, during actual enforcement, should adopt simple mode controlling magnet rotation as far as possible;
For example, can adopt the 2PSK modulation system that described wellbore trace parameter information is carried out modulation treatment in the present embodiment, and adopt the direction of rotation of controlling magnet to produce alternating magnetic field, as when coded message corresponding to modulation signal is " 0 ", controlling magnet rotates according to clockwise direction with the speed that per second 20 turns, when coded message corresponding to modulation signal was " 1 ", controlling magnet rotated according to counter clockwise direction with the speed that per second 20 turns, and the frequency of the alternating magnetic field that then produces is 20Hz.
In sum, the nearly bit drills log signal transmission system, the Apparatus and method for that provide of the embodiment of the invention has following beneficial effect:
(1) need to not bury cable underground at the power drilling tool fluting, not affect the mechanical strength of power drilling tool;
(2) impact of stratum and drilling fluid can not carried out radio communication near signals transmission was not subjected in the drilling fluid of high salinity, and transmission channel is stable;
(3) transfer rate can reach 20bits/s, and transmission range can reach 20m, and transmission range is long, transfer rate is high and the bit error rate is low.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; the protection domain that is not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a nearly bit drills log signal transmission system is characterized in that, described nearly bit drills log signal transmission system comprises: drilling well sensor, emitter, receiver and measurement while-drilling instrument; Wherein,
The drilling well sensor, the non magnetic drill collar that is packaged between power drilling tool and the drill bit is inner, is used for measuring the wellbore trace parameter information and sending to described emitter;
Emitter, the non magnetic drill collar that is packaged between power drilling tool and the drill bit is inner, is connected with described drilling well sensor, is used for producing alternating magnetic field according to described wellbore trace parameter information;
Receiver is arranged at the power drilling tool end near measurement while-drilling instrument, is used for utilizing described alternating magnetic field to produce sensor current signal, obtains the wellbore trace parameter information and sends to described measurement while-drilling instrument according to described sensor current signal;
Measurement while-drilling instrument is arranged between power drilling tool and the ground, is used for described wellbore trace parameter information is sent to geoceiver.
2. a nearly bit drills log signal transmission equipment is characterized in that, described nearly bit drills log signal transmission equipment comprises: transmitter and receiver; Wherein,
Emitter is packaged in the non magnetic drill collar that is arranged between power drilling tool and the drill bit inner, is connected with the drilling well sensor, is used for receiving the wellbore trace parameter information that described drilling well sensor sends, and produces alternating magnetic field according to described wellbore trace parameter information;
Receiver, be arranged at the power drilling tool end near measurement while-drilling instrument, be used for utilizing described alternating magnetic field to produce sensor current signal, obtain described wellbore trace parameter information according to described sensor current signal, and the described wellbore trace parameter information that obtains is sent to measurement while-drilling instrument.
3. equipment as claimed in claim 2 is characterized in that, described emitter specifically comprises: the first data-interface, modulating apparatus, control device, motor and magnet; Wherein,
The first data-interface is used for receiving the wellbore trace parameter information of drilling well sensor transmission and sending to described modulating apparatus;
Modulating apparatus connects described the first data-interface, is used for that described wellbore trace parameter information is carried out modulation treatment and obtains modulation signal, and described modulation signal is sent to control device;
Control device connects described modulating apparatus, is used for controlling described motor rotation according to described modulation signal;
Motor is fixedly connected with described magnet, is used for driving described magnet rotation;
Magnet is used for producing alternating magnetic field by rotation.
4. equipment as claimed in claim 3 is characterized in that, described magnet is permanent magnet.
5. equipment as claimed in claim 2 is characterized in that, described receiver specifically comprises: coil, amplifier, wave filter, signal demodulating equipment, the second data-interface; Wherein,
Coil is wound in outside the drill string of described power drilling tool end, is used for producing sensor current signal according to described alternating magnetic field;
Amplifier connects described coil, is used for described sensor current signal is amplified processing;
Wave filter connects described amplifier, is used for the sensor current signal that amplifies after processing is carried out the filtering processing;
Signal demodulating equipment connects described wave filter, is used for that the sensor current signal after the filtering processing is carried out rectification and processes to obtain the wellbore trace parameter information;
The second data-interface connects respectively described signal demodulating equipment and measurement while-drilling instrument, is used for the described wellbore trace parameter information that obtains is sent to described measurement while-drilling instrument.
6. a nearly bit drills log signal transmission method is characterized in that, described nearly bit drills log signal transmission method comprises:
Emitter receives the wellbore trace parameter information that the drilling well sensor sends, and produces alternating magnetic field according to described wellbore trace parameter information, and the non magnetic drill collar that described emitter is packaged between power drilling tool and the drill bit is inner;
Receiver utilizes described alternating magnetic field to produce sensor current signal, obtains the wellbore trace parameter information and sends to measurement while-drilling instrument according to described sensor current signal, and described receiver is arranged at the power drilling tool end near measurement while-drilling instrument.
7. method as claimed in claim 6 is characterized in that, produces alternating magnetic field according to described wellbore trace parameter information, specifically comprises:
Described wellbore trace parameter information is carried out modulation treatment, obtain modulation signal;
According to described modulation signal, controlling magnet rotates to produce alternating magnetic field.
8. method as claimed in claim 7 is characterized in that, described wellbore trace parameter information is carried out modulation treatment, is specially: described wellbore trace parameter information is carried out two-phase PSK 2PSK modulation treatment.
9. method as claimed in claim 7 is characterized in that, controlling magnet rotates to produce alternating magnetic field, is specially:
Control the direction of described magnet rotation; And/or,
Control the speed of described magnet rotation; And/or,
Controlling described magnet begins or stops the rotation.
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| CN104301001A (en) * | 2014-09-12 | 2015-01-21 | 上海卫星工程研究所 | Space communication method and system based on magnetic emission and magnetic detection |
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| CN106014400A (en) * | 2016-06-16 | 2016-10-12 | 辽宁工程技术大学 | Coal and rock mass physical-property monitoring device and method |
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