CN102937022B - 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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- CN102937022B CN102937022B CN201210458259.1A CN201210458259A CN102937022B CN 102937022 B CN102937022 B CN 102937022B CN 201210458259 A CN201210458259 A CN 201210458259A CN 102937022 B CN102937022 B CN 102937022B
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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 wellbore trace parameter most important to construction success or not, the geological environment faced along with current drilling well industry becomes increasingly complex, and the control accuracy of wellbore trace requires also day by day to improve.
In drilling process, wellbore trace parameter major embodiment is the data such as hole angle, azimuth of drill bit position place well, generally adopt measurement while-drilling instrument (Measure While Drilling at present, be called for short MWD) measure wellbore trace parameter, but because directed drilling construction needs to use power drilling tool, and measurement while-drilling instrument and drill bit are separately positioned on the two ends of power drilling tool (being generally about tens meters), therefore measurement while-drilling instrument directly can not obtain the data such as drill bit position place hole angle, azimuth.In order to address this problem, be everlasting at present between power drilling tool and drill bit and non magnetic drill collar is set, and device is specifically designed to measurement drill bit position hole angle and the isoparametric downhole sensors in azimuth wherein, then send the data of downhole sensors collection to steering tool by nearly bit drills log signal transmission system, then by steering tool, image data is transferred to geoceiver.
At present, the signal transmission form that nearly bit signal transmission system is commonly used mainly is divided into wire transmission and wireless transmission two kinds, wherein, wire transmission mode needs fluting on power drilling tool to bury cable underground to connect downhole sensors and steering tool, but this transmission means can affect the mechanical strength of power drilling tool, and the spinning precision between joint drill string each in power drilling tool is had higher requirements, implementation cost is very high, wireless transmission method adopts electromagnetic transmission signal mostly, i.e. winding around on non magnetic drill collar, electromagnetic wave signal is sent through coil after the Data Modulation gather downhole sensors, received by reception antenna after electromagnetic wave signal strides across power drilling tool and be transferred to measurement while-drilling instrument, last measurement while-drilling instrument obtains wellbore trace parameter information by demodulation electromagnetic wave signal, the message transmission rate of this transmitting procedure is generally 10bits/s, transmission range is generally 10m ~ 20m, this transmitting procedure is easily by neighbouring stratum and drilling fluid (high salinity stratum production fluid, there is comparatively forceful electric power conductance) impact, cause 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 present invention is to provide a kind of nearly bit drills log signal transmission system, Apparatus and method for, so that the nearly bit signal transmission system implementation cost solving prior art is high or channel is unstable, path loss is large, transfer rate is low and the problem that the bit error rate is higher.
To achieve these goals, the embodiment of the present invention provides a kind of nearly bit drills log signal transmission system, comprising: downhole sensors, emitter, receiver and measurement while-drilling instrument; Wherein,
Downhole sensors, the non magnetic drill collar be packaged between power drilling tool and drill bit is inner, for measuring wellbore trace parameter information and sending to described emitter;
Emitter, the non magnetic drill collar be packaged between power drilling tool and drill bit is inner, is connected with described downhole sensors, 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, for utilizing described alternating magnetic field to produce sensor current signal, obtaining wellbore trace parameter information and send to described measurement while-drilling instrument according to described sensor current signal;
Measurement while-drilling instrument, is arranged between power drilling tool and ground, for described wellbore trace parameter information is sent to geoceiver.
A kind of nearly bit drills log signal transmission equipment, comprising: transmitter and receiver; Wherein,
Emitter, is packaged in the non magnetic drill collar be arranged between power drilling tool and drill bit inner, is connected with downhole sensors, for receiving the wellbore trace parameter information that described downhole sensors 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, for utilizing described alternating magnetic field to produce sensor current signal, obtaining described wellbore trace parameter information according to described sensor current signal, and the wellbore trace parameter information of described acquisition is sent to measurement while-drilling instrument.
Preferably, described emitter specifically comprises: the first data-interface, modulating apparatus, control device, motor and magnet; Wherein,
First data-interface, for receiving the wellbore trace parameter information of downhole sensors transmission and sending to described modulating apparatus;
Modulating apparatus, connects described first data-interface, obtains modulation signal, and described modulation signal is sent to control device for carrying out modulation treatment to described wellbore trace parameter information;
Control device, connects described modulating apparatus, rotates for controlling described motor according to described modulation signal;
Motor, is fixedly connected with described magnet, rotates for driving described magnet;
Magnet, for producing alternating magnetic field by rotating.
Preferably, described magnet is permanent magnet.
Preferably, described receiver specifically comprises: coil, amplifier, wave filter, signal demodulating equipment, the second data-interface; Wherein,
Coil, outside the drill string being wound in described power drilling tool end, for producing sensor current signal according to described alternating magnetic field;
Amplifier, connects described coil, for carrying out amplification process to described sensor current signal;
Wave filter, connects described amplifier, for carrying out filtering process to amplifying the sensor current signal after processing;
Signal demodulating equipment, connects described wave filter, for carrying out rectification process to the sensor current signal after filtering process to obtain wellbore trace parameter information;
Second data-interface, connects described signal demodulating equipment and measurement while-drilling instrument respectively, for the wellbore trace parameter information of described acquisition 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 downhole sensors 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 drill bit is inner;
Receiver utilizes described alternating magnetic field to produce sensor current signal, obtains 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.
Preferably, produce alternating magnetic field according to described wellbore trace parameter information, specifically comprise:
Modulation treatment is carried out to described wellbore trace parameter information, obtains modulation signal;
According to described modulation signal, controlling magnet rotates to produce alternating magnetic field.
Preferably, modulation treatment is carried out to described wellbore trace parameter information, is specially: two-phase PSK 2PSK modulation treatment is carried out to described wellbore trace parameter information.
Preferably, controlling magnet rotates to produce alternating magnetic field, is specially:
Control the direction that described magnet rotates; And/or,
Control the speed that described magnet rotates; And/or,
Control described magnet start or stop the rotation.
By means of technique scheme, the present invention is based on electromagnetic induction principle, alternating magnetic field is produced according to the wellbore trace parameter after modulation by the emitter near drill bit, the drill string of power drilling tool is utilized to converge the magnetic line of force of described alternating magnetic field, sensor current signal is produced according to alternating magnetic field by the receiver near measurement while-drilling instrument, and obtain wellbore trace parameter information according to sensor current signal, compared to the mode adopting cable transmission signal in prior art, the embodiment of the present invention does not need fluting on power drilling tool to bury cable underground, the mechanical strength of power drilling tool can not be affected, compared to the mode adopting electromagnetic transmission signal in prior art, the transmitting procedure of the embodiment of the present invention can not be subject to the impact of neighbouring stratum and drilling fluid, transmission channel is stablized, transmission range is long, transfer rate is high and the bit error rate is low.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the nearly bit drills log signal transmission system that the embodiment of the present invention one provides;
Fig. 2 is the structural representation of the nearly bit drills log signal transmission equipment that the embodiment of the present invention two provides;
Fig. 3 is the structural representation of the emitter that the embodiment of the present invention two provides;
Fig. 4 is the structural representation of the receiver that the embodiment of the present invention two provides;
Fig. 5 is the alternating magnetic field magnetic line of force distribution schematic diagram that the embodiment of the present invention two provides;
Fig. 6 is the nearly bit drills log signal transmission method flow chart that the embodiment of the present invention three provides;
Fig. 7 is the method flow diagram producing alternating magnetic field according to wellbore trace parameter information that the embodiment of the present invention three provides.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
It is pointed out that in the embodiment of the present invention, said wellbore trace parameter information refers to the data message such as hole angle, azimuth of drill bit position place well.
In view of existing nearly bit signal transmission system has that implementation cost is high, channel is unstable, path loss is large, transfer rate is low and the more high defect of the bit error rate, embodiments provide a kind of nearly bit drills log signal transmission system, Apparatus and method for, stablized by transmission channel in order to realization, without multipath loss, transfer rate is high and the wellbore trace parameter information of downhole sensors collection is sent to the object of measurement while-drilling instrument by the transmission means that the bit error rate is low.Below in conjunction with accompanying drawing, the present invention is described in detail.
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: downhole sensors 11, emitter 12, receiver 13 and measurement while-drilling instrument 14; Wherein,
Downhole sensors 11, the non magnetic drill collar be packaged between power drilling tool and drill bit is inner, for measuring wellbore trace parameter information and sending to described emitter 12;
Emitter 12, the non magnetic drill collar be packaged between power drilling tool and drill bit is inner, is connected with described downhole sensors 11, for producing alternating magnetic field according to described wellbore trace parameter information;
Receiver 13, is arranged at the power drilling tool end near measurement while-drilling instrument 14, for utilizing described alternating magnetic field to produce sensor current signal, obtaining wellbore trace parameter information and send to described measurement while-drilling instrument 14 according to described sensor current signal;
Measurement while-drilling instrument 14, is arranged between power drilling tool and ground, for described wellbore trace parameter information is sent to geoceiver.
Concrete, as shown in Figure 1, the non magnetic drill collar that downhole sensors 11 and emitter 12 are packaged between power drilling tool and drill bit is inner, namely arranges near drill bit; Receiver 13 is arranged at the end of power drilling tool, and arranges near measurement while-drilling instrument 14; Emitter 12 and receiver 13 are arranged at the two ends of power drilling tool by the present embodiment respectively, and utilize emitter 12 to produce alternating magnetic field, utilize the drill string of power drilling tool (having high magnetic permeability) to converge the magnetic line of force of described alternating magnetic field, and the wellbore trace parameter information that downhole sensors 11 gathers by the mode utilizing receiver 13 to produce sensor current signal is transferred to measurement while-drilling instrument 14.
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, meet completely and stride across power drilling tool, the wellbore trace parameter information gathered by downhole sensors 11 is transferred to the object of measurement while-drilling instrument 14.Compared to the nearly bit drills log signal transmission system adopting cable transmission signal in prior art, the present embodiment does not need fluting on power drilling tool to bury cable underground, the mechanical strength of power drilling tool can not be affected, compared to the nearly bit drills log signal transmission system adopting electromagnetic transmission signal in prior art, the present embodiment can not be subject to the impact of neighbouring stratum and drilling fluid, and transmission channel is stable, without 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,
Emitter 21, is packaged in the non magnetic drill collar be arranged between power drilling tool and drill bit inner, is connected with downhole sensors, for receiving the wellbore trace parameter information that described downhole sensors sends, and produces alternating magnetic field according to described wellbore trace parameter information;
Receiver 22, be arranged at the power drilling tool end near measurement while-drilling instrument, for utilizing described alternating magnetic field to produce sensor current signal, obtaining described wellbore trace parameter information according to described sensor current signal, and the wellbore trace parameter information of described acquisition is sent to measurement while-drilling instrument.
Concrete, emitter 21 is packaged in non magnetic drill collar inside by the present embodiment, harmful effect is caused to the alternating magnetic field produced in the present embodiment in the magnetic field produced to avoid power drilling tool and drill bit, emitter 21 is connected with the same downhole sensors being arranged at non magnetic drill collar inside, for receiving the wellbore trace parameter information that downhole sensors gathers, and produce alternating magnetic field according to wellbore trace parameter information, therefore, namely the magnetic line of force changes in distribution situation of the alternating magnetic field produced itself characterizes wellbore trace parameter information;
Receiver 22 is arranged at the power drilling tool end near measurement while-drilling instrument by the present embodiment, namely one end near measurement while-drilling instrument in power drilling tool two ends is arranged at, alternating magnetic field for producing according to emitter 21 produces sensor current signal, because the magnetic line of force changes in distribution situation of described alternating magnetic field itself characterizes wellbore trace parameter information, the sensor current signal produced based on electromagnetic induction principle also characterizes wellbore trace parameter information, therefore receiver 22 can obtain wellbore trace parameter information according to described sensor current signal and send to measurement while-drilling instrument.
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,
First data-interface 211, for receiving the wellbore trace parameter information of downhole sensors transmission and sending to described modulating apparatus 212;
Modulating apparatus 212, connects described first data-interface 211, obtains modulation signal, and described modulation signal is sent to described control device 213 for carrying out modulation treatment to described wellbore trace parameter information;
Control device 213, connects described modulating apparatus 212, rotates for controlling described motor 214 according to described modulation signal;
Motor 214, is fixedly connected with described magnet 215, rotates for driving described magnet 215;
Magnet 215, for producing alternating magnetic field by rotating.
Concrete, according to the needs of modulates information process, described magnet 215 can be set for one or more, go to characterize wellbore trace parameter information to produce one or more alternating magnetic field; During actual enforcement, although magnet 215 number adopted is more, the information transmitted is more accurate, speed is also higher, but consider in the high-temperature work environment of down-hole and modulates information unit factor should do not allowed according to complex disposal process to produce more heat, therefore need the number rationally arranging magnet 215, both reached certain information transmission precision, transmission speed, the heat of guarantee information modulating device generation is less again.
Preferably, the magnet 215 used in the present embodiment is permanent magnet 215.
Concrete, because the magnetic field conditions of down-hole is complicated, disturb more, the stronger alternating magnetic field of magnetic field intensity can be experienced in order to ensure receiver in the present embodiment 22, the ill effects such as the power consumption simultaneously avoiding use electromagnet 215 to bring and heat-dissipating, adopt permanent magnet 215 to produce alternating magnetic field 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, second data-interface 225; Wherein,
Coil 221, outside the drill string being wound in described power drilling tool end, for producing sensor current signal according to described alternating magnetic field;
Amplifier 222, connects described coil 221, for carrying out amplification process to described sensor current signal;
Wave filter 223, connects described amplifier 222, for carrying out filtering process to amplifying the sensor current signal after processing;
Signal demodulating equipment 224, connects described wave filter 223, for carrying out rectification process to the sensor current signal after filtering process to obtain wellbore trace parameter information;
Second data-interface 225, connects described signal demodulating equipment 224 and measurement while-drilling instrument respectively, for the wellbore trace parameter information of described acquisition 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, has convergence effect to the line of magnetic induction of the alternating magnetic field that emitter 21 produces; Power drilling tool is connected to form by multiple drill string, coil 221 is wound in outside the drill string of power drilling tool end by the present embodiment, and arrange near measurement while-drilling instrument, coil 221 the magnetic flux surrounded in area can follow the change of alternating magnetic field and change, also the induced electromotive force along with alternating magnetic field change and sensor current signal can just be produced, this sensor current signal characterizes the situation of change of alternating magnetic field, also just characterizes wellbore trace parameter information;
Because subsurface environment exists multiple magnetic field (magnetic field etc. as produced in earth's magnetic field, power drilling tool or bit operation process), the magnetic line of force that various magnetic field produces all likely causes coil 221 that electromagnetic induction occurs, and then generation interfering signal, wave filter 223 is set by these interfering signals of filtering, to obtain the sensor current signal that truly can reflect alternating magnetic field situation of change in the present embodiment;
In the present embodiment, the sensor current signal after signal demodulating equipment 224 pairs of filtering process is adopted to carry out rectification process, to obtain wellbore trace parameter information, the rectification process that this signal demodulating equipment 224 does should be corresponding with the modulation treatment that modulating apparatus 212 in emitter 21 does, to obtain the information as far as possible consistent with original wellbore trace parameter information.
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 downhole sensors 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 drill bit is inner;
Step S62, receiver utilizes described alternating magnetic field to produce sensor current signal, obtains 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, alternating magnetic field is produced according to the wellbore trace parameter after modulation by the emitter near drill bit, the drill string of power drilling tool is utilized to converge the magnetic line of force of described alternating magnetic field, sensor current signal is produced according to alternating magnetic field by the receiver near measurement while-drilling instrument, and obtain wellbore trace parameter information according to sensor current signal, compared to the mode adopting cable transmission signal in prior art, the embodiment of the present invention does not need fluting on power drilling tool to bury cable underground, the mechanical strength of power drilling tool can not be affected, compared to the mode adopting electromagnetic transmission signal in prior art, the transmitting procedure of the present embodiment can not be subject to the impact of neighbouring stratum and drilling fluid, transmission channel is stablized, 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 in 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 modulation treatment is carried out to wellbore trace parameter information, can obtain and characterize wellbore trace parameter information and the modulation signal with the simple form of expression, when utilizing this modulation signal controlling magnet to rotate, the magnetic field that magnet produces is change alternately, also just defines alternating magnetic field.
Preferably, in above-mentioned steps S71, modulation treatment is carried out to described wellbore trace parameter information, is specially: two-phase PSK (Binary Phase Shift Keying is called for short 2PSK) modulation treatment is carried out to described wellbore trace parameter information.
Concrete, after modulation treatment being carried out to described wellbore trace parameter information according to 2PSK modulation system, the modulation signal obtained is binary coding information, namely the coded message be made up of " 0 " or " 1 ", this modulation treatment algorithm is simple, the modulating apparatus of emitter adopts during 2PSK modulation system and can not produce amount of heat because algorithm is complicated, is conducive to down-hole high-temperature operation.
Preferably, in above-mentioned steps S72, controlling magnet rotates to produce alternating magnetic field, is specially:
Control the direction that described magnet rotates; And/or,
Control the speed that described magnet rotates; And/or,
Control described magnet start or stop 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 above-mentioned two or three mode of mixing can be adopted to produce alternating magnetic field, but consider down-hole hot environment operation, guarantee that the control device of emitter can not produce higher heat because control procedure is complicated, during actual enforcement, simple mode controlling magnet should be adopted to rotate as far as possible;
Such as, 2PSK modulation system can be adopted in the present embodiment to carry out modulation treatment to described wellbore trace parameter information, and adopt the direction of rotation of controlling magnet to produce alternating magnetic field, when coded message as corresponding when modulation signal is " 0 ", controlling magnet rotates according to clockwise direction with the speed of 20 turns per second, when the coded message that modulation signal is corresponding is " 1 ", controlling magnet is with the speed of 20 turns per second according to counterclockwise rotating, then the frequency of the alternating magnetic field produced is 20Hz.
In sum, the embodiment of the present invention provides nearly bit drills log signal transmission system, Apparatus and method for have following beneficial effect:
(1) do not need fluting on power drilling tool to bury cable underground, do not affect the mechanical strength of power drilling tool;
(2) signals transmission is not subject to the impact of neighbouring stratum and drilling fluid, can carry out radio communication in the drilling fluid of high salinity, and transmission channel is stablized;
(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; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; the protection domain be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a nearly bit drills log signal transmission system, is characterized in that, described nearly bit drills log signal transmission system comprises: downhole sensors, emitter, receiver and measurement while-drilling instrument; Wherein,
Downhole sensors, the non magnetic drill collar be packaged between power drilling tool and drill bit is inner, for measuring wellbore trace parameter information and sending to described emitter;
Emitter, the non magnetic drill collar be packaged between power drilling tool and drill bit is inner, is connected with described downhole sensors, 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, for utilizing described alternating magnetic field to produce sensor current signal, obtaining wellbore trace parameter information and send to described measurement while-drilling instrument according to described sensor current signal;
Measurement while-drilling instrument, is arranged between power drilling tool and ground, for described wellbore trace parameter information is sent to geoceiver;
Described emitter specifically comprises: the first data-interface, modulating apparatus, control device, motor and permanent magnet; Wherein,
First data-interface, for receiving the wellbore trace parameter information of downhole sensors transmission and sending to described modulating apparatus;
Modulating apparatus, connects described first data-interface, obtains modulation signal, and described modulation signal is sent to control device for carrying out two-phase PSK 2PSK modulation treatment to described wellbore trace parameter information;
Control device, connects described modulating apparatus, rotates for controlling described motor according to described modulation signal;
Motor, is fixedly connected with described permanent magnet, for driving described rotary type permanent-magnet;
Permanent magnet, for producing alternating magnetic field by rotating;
Described control device controls the direction of described rotary type permanent-magnet by controlling described motor, and/or, speed, and/or, start or stop the rotation.
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 be arranged between power drilling tool and drill bit inner, is connected with downhole sensors, for receiving the wellbore trace parameter information that described downhole sensors 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, for utilizing described alternating magnetic field to produce sensor current signal, obtaining described wellbore trace parameter information according to described sensor current signal, and the wellbore trace parameter information of described acquisition is sent to measurement while-drilling instrument;
Wherein, described emitter specifically comprises: the first data-interface, modulating apparatus, control device, motor and permanent magnet; Wherein,
First data-interface, for receiving the wellbore trace parameter information of downhole sensors transmission and sending to described modulating apparatus;
Modulating apparatus, connects described first data-interface, obtains modulation signal, and described modulation signal is sent to control device for carrying out two-phase PSK 2PSK modulation treatment to described wellbore trace parameter information;
Control device, connects described modulating apparatus, rotates for controlling described motor according to described modulation signal;
Motor, is fixedly connected with described permanent magnet, for driving described rotary type permanent-magnet;
Permanent magnet, for producing alternating magnetic field by rotating;
Described control device controls the direction of described rotary type permanent-magnet by controlling described motor, and/or, speed, and/or, start or stop the rotation.
3. equipment as claimed in claim 2, it is characterized in that, described receiver specifically comprises: coil, amplifier, wave filter, signal demodulating equipment, the second data-interface; Wherein,
Coil, outside the drill string being wound in described power drilling tool end, for producing sensor current signal according to described alternating magnetic field;
Amplifier, connects described coil, for carrying out amplification process to described sensor current signal;
Wave filter, connects described amplifier, for carrying out filtering process to amplifying the sensor current signal after processing;
Signal demodulating equipment, connects described wave filter, for carrying out rectification process to the sensor current signal after filtering process to obtain wellbore trace parameter information;
Second data-interface, connects described signal demodulating equipment and measurement while-drilling instrument respectively, for the wellbore trace parameter information of described acquisition is sent to described measurement while-drilling instrument.
4. for a nearly bit drills log signal transmission method for bit drills log signal transmission system near described in claim 1, it is characterized in that, described nearly bit drills log signal transmission method comprises:
Emitter receives the wellbore trace parameter information that downhole sensors sends, and two-phase PSK 2PSK modulation treatment is carried out to described wellbore trace parameter information, obtain modulation signal, control rotary type permanent-magnet to produce alternating magnetic field according to described modulation signal, the non magnetic drill collar that described emitter is packaged between power drilling tool and drill bit is inner;
Receiver utilizes described alternating magnetic field to produce sensor current signal, obtains 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;
Wherein, control rotary type permanent-magnet to produce alternating magnetic field, be specially:
Control the direction of described rotary type permanent-magnet; And/or,
Control the speed of described rotary type permanent-magnet; And/or,
Control described permanent magnet start or stop the rotation.
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