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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- 238000005553 drilling Methods 0.000 title claims abstract description 257
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- 230000010363 phase shift Effects 0.000 claims description 4
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- 239000007789 gas Substances 0.000 description 10
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- 239000012530 fluid Substances 0.000 description 5
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- 238000010276 construction Methods 0.000 description 3
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- 239000003245 coal Substances 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
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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 invention relates to the technical field of petroleum, natural gas, coal bed gas and other exploitation, in particular to a near-bit drilling signal transmission system, equipment and a method.
Background
In the directional drilling construction of petroleum, natural gas, coal bed gas and the like, the acquisition of drilling track parameters is crucial to the success of the construction, and the control precision requirement of the drilling track is increasingly improved along with the increasing complexity of the geological environment faced by the current drilling industry.
In the Drilling process, Drilling track parameters mainly include data such as a bevel angle and an azimuth angle of a borehole at the position of a drill bit, and currently, a Measurement While Drilling (MWD) instrument is generally adopted to Measure the Drilling track parameters, but because a power Drilling tool is required for directional Drilling construction, and the MWD instrument and the drill bit are respectively arranged at two ends of the power Drilling tool (generally about ten meters in length), the MWD instrument cannot directly obtain the data such as the bevel angle and the azimuth angle at the position of the drill bit. In order to solve the problem, a non-magnetic drill collar is usually arranged between a power drilling tool and a drill bit at present, a drilling sensor specially used for measuring parameters such as a well inclination angle, an azimuth angle and the like at the position of the drill bit is arranged in the non-magnetic drill collar, data collected by the drilling sensor is transmitted to a measurement-while-drilling instrument through a near-drill-bit drilling signal transmission system, and the collected data is transmitted to a ground receiver by the measurement-while-drilling instrument.
At present, the common signal transmission modes of a near-bit signal transmission system are mainly divided into wired transmission and wireless transmission, wherein the wired transmission mode needs to open a slot on a power drilling tool and embed a cable so as to connect a drilling sensor and a measurement while drilling instrument, but the transmission mode can affect the mechanical strength of the power drilling tool, has higher requirements on the screwing precision among all sections of drill strings in the power drilling tool and has higher implementation cost; the wireless transmission mode mostly adopts electromagnetic wave transmission signals, namely coils are wound on a non-magnetic drill collar, data collected by a drilling sensor are modulated and then transmitted to the electromagnetic wave signals through the coils, the electromagnetic wave signals cross a power drilling tool and then are received by a receiving antenna and transmitted to a measurement while drilling instrument, finally the measurement while drilling instrument obtains drilling track parameter information by demodulating the electromagnetic wave signals, the data transmission rate in the transmission process is generally 10bits/s, the transmission distance is generally 10 m-20 m, and the transmission process is easily influenced by nearby strata and drilling fluid (high-salinity stratum produced fluid which has strong conductivity), so that the electromagnetic wave signal transmission channel is unstable, the transmission rate is low and the error rate is high.
Disclosure of Invention
The embodiment of the invention mainly aims to provide a near-bit drilling signal transmission system, a device and a method, so as to solve the problems of high implementation cost or unstable channel, large path loss, low transmission rate and higher error rate of the near-bit signal transmission system in the prior art.
In order to achieve the above object, an embodiment of the present invention provides a near-bit drilling signal transmission system, including: the device comprises a drilling sensor, a transmitter, a receiver and a measurement while drilling instrument; wherein,
the drilling sensor is packaged in the non-magnetic drill collar between the power drilling tool and the drill bit and used for measuring drilling track parameter information and sending the information to the transmitter;
the transmitter is packaged in the non-magnetic drill collar between the power drilling tool and the drill bit, is connected with the drilling sensor and is used for generating an alternating magnetic field according to the drilling track parameter information;
the receiver is arranged at the end part of the power drilling tool close to the measurement while drilling instrument and used for generating an induced current signal by using the alternating magnetic field, acquiring drilling track parameter information according to the induced current signal and sending the drilling track parameter information to the measurement while drilling instrument;
and the measurement while drilling instrument is arranged between the power drilling tool and the ground and is used for sending the drilling track parameter information to a ground receiver.
A near-bit drilling signal transmission apparatus, comprising: a transmitter and a receiver; wherein,
the transmitter is packaged in a non-magnetic drill collar arranged between the power drilling tool and the drill bit, is connected with the drilling sensor, and is used for receiving drilling track parameter information sent by the drilling sensor and generating an alternating magnetic field according to the drilling track parameter information;
and the receiver is arranged at the end part of the power drilling tool close to the measurement while drilling instrument and used for generating an induced current signal by using the alternating magnetic field, acquiring the drilling track parameter information according to the induced current signal and sending the acquired drilling track parameter information to the measurement while drilling instrument.
Preferably, the transmitter includes: the device comprises a first data interface, a signal modulation device, a control device, a motor and a magnet; wherein,
the first data interface is used for receiving drilling track parameter information sent by a drilling sensor and sending the drilling track parameter information to the signal modulation device;
the signal modulation device is connected with the first data interface and used for modulating the drilling track parameter information to obtain a modulation signal and sending the modulation signal to the control device;
the control device is connected with the signal modulation device and is used for controlling the motor to rotate according to the modulation signal;
the motor is fixedly connected with the magnet and used for driving the magnet to rotate;
and a magnet for generating an alternating magnetic field by rotation.
Preferably, the magnet is a permanent magnet.
Preferably, the receiver specifically includes: the coil, the amplifier, the filter, the signal demodulation device and the second data interface; wherein,
the coil is wound on the outer side of a drill string at the end part of the power drill and is used for generating an induced current signal according to the alternating magnetic field;
the amplifier is connected with the coil and used for amplifying the induced current signal;
the filter is connected with the amplifier and is used for filtering the amplified induced current signal;
the signal demodulation device is connected with the filter and is used for demodulating the induced current signal after filtering processing so as to obtain drilling track parameter information;
and the second data interface is respectively connected with the signal demodulation device and the measurement-while-drilling instrument and is used for sending the acquired drilling track parameter information to the measurement-while-drilling instrument.
A near-bit drilling signal transmission method comprising:
the transmitter receives drilling track parameter information sent by the drilling sensor and generates an alternating magnetic field according to the drilling track parameter information, and the transmitter is packaged in a non-magnetic drill collar between the power drilling tool and the drill bit;
the receiver utilizes the alternating magnetic field to generate an induced current signal, drilling track parameter information is obtained according to the induced current signal and is sent to the measurement while drilling instrument, and the receiver is arranged at the end part of the power drilling tool close to the measurement while drilling instrument.
Preferably, generating an alternating magnetic field according to the drilling trajectory parameter information specifically includes:
modulating the drilling track parameter information to obtain a modulation signal;
and controlling the magnet to rotate according to the modulation signal so as to generate an alternating magnetic field.
Preferably, the modulation processing is performed on the drilling trajectory parameter information, specifically: and carrying out binary phase shift keying (2 PSK) modulation processing on the drilling trajectory parameter information.
Preferably, the magnet is controlled to rotate to generate an alternating magnetic field, specifically:
controlling a direction of rotation of the magnet; and/or the presence of a gas in the gas,
controlling the speed at which the magnet rotates; and/or the presence of a gas in the gas,
controlling the magnet to start or stop rotating.
By means of the technical scheme, the alternating magnetic field is generated by the transmitter close to the drill bit according to the modulated drilling track parameters based on the electromagnetic induction principle, the magnetic lines of force of the alternating magnetic field are converged by the drill column of the power drilling tool, the induced current signal is generated by the receiver close to the measurement while drilling instrument according to the alternating magnetic field, and the drilling track parameter information is obtained according to the induced current signal.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
FIG. 1 is a schematic diagram of a near-bit drilling signal transmission system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a near-bit drilling signal transmission device according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a transmitter according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a receiver according to a second embodiment of the present invention;
FIG. 5 is a schematic view of the distribution of the magnetic lines of the alternating magnetic field provided by the second embodiment of the present invention;
FIG. 6 is a flow chart of a near bit drilling signal transmission method according to a third embodiment of the present invention;
FIG. 7 is a flowchart of a method for generating an alternating magnetic field according to information on a parameter of a drilling trajectory according to a third embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the drilling trajectory parameter information in the embodiments of the present invention refers to data information such as a borehole inclination angle and an azimuth angle at a position of the drill bit.
In view of the defects that the existing near-bit signal transmission system has high implementation cost, unstable channel, large path loss, low transmission rate, high error rate and the like, the embodiment of the invention provides a near-bit drilling signal transmission system, device and method, which are used for achieving the purpose of sending drilling track parameter information acquired by a drilling sensor to a measurement while drilling instrument through a transmission mode with stable transmission channel, no multi-path loss, high transmission rate and low error rate. The present invention will be described in detail below with reference to the accompanying drawings.
Example one
The present embodiment provides a near-bit drilling signal transmission system, as shown in fig. 1, including: a drilling sensor 11, a transmitter 12, a receiver 13 and a measurement while drilling instrument 14; wherein,
the drilling sensor 11 is packaged in a non-magnetic drill collar between the power drilling tool and the drill bit and used for measuring drilling track parameter information and sending the information to the transmitter 12;
the transmitter 12 is packaged in a non-magnetic drill collar between the power drilling tool and the drill bit, is connected with the drilling sensor 11, and is used for generating an alternating magnetic field according to the drilling track parameter information;
the receiver 13 is arranged at the end part of the power drill close to the measurement while drilling instrument 14 and used for generating an induced current signal by using the alternating magnetic field, acquiring drilling track parameter information according to the induced current signal and sending the drilling track parameter information to the measurement while drilling instrument 14;
and the measurement while drilling instrument 14 is arranged between the power drill and the ground and is used for sending the drilling track parameter information to a ground receiver.
Specifically, as shown in fig. 1, the drilling sensor 11 and the transmitter 12 are packaged inside a non-magnetic drill collar between the power drill and the drill bit, i.e., disposed close to the drill bit; the receiver 13 is arranged at the end part of the power drill and is close to the measurement while drilling instrument 14; in the embodiment, the transmitter 12 and the receiver 13 are respectively arranged at two ends of the power drill, the transmitter 12 is used for generating an alternating magnetic field, a drill string (with high magnetic permeability) of the power drill is used for converging magnetic lines of the alternating magnetic field, and the receiver 13 is used for generating an induced current signal to transmit drilling track parameter information acquired by the drilling sensor 11 to the measurement while drilling instrument 14.
The signal transmission rate of the near-bit drilling signal transmission system provided by the embodiment can reach 20bits/s, the transmission distance can reach 20m, and the purpose of crossing a power drilling tool and transmitting the drilling track parameter information acquired by the drilling sensor 11 to the measurement while drilling instrument 14 is completely met. Compared with the near-bit drilling signal transmission system adopting electromagnetic waves to transmit signals in the prior art, the near-bit drilling signal transmission system is not influenced by nearby stratums and drilling fluid, and has the advantages of stable transmission channel, no multipath loss, high transmission rate and low error rate.
Example two
The present embodiment provides a near-bit drilling signal transmission apparatus, as shown in fig. 2, including: a transmitter 21 and a receiver 22; wherein,
the transmitter 21 is packaged in a non-magnetic drill collar arranged between the power drilling tool and the drill bit, connected with the drilling sensor, and used for receiving drilling track parameter information sent by the drilling sensor and generating an alternating magnetic field according to the drilling track parameter information;
and the receiver 22 is arranged at the end part of the power drill close to the measurement while drilling instrument, and is used for generating an induced current signal by using the alternating magnetic field, acquiring the drilling track parameter information according to the induced current signal and sending the acquired drilling track parameter information to the measurement while drilling instrument.
Specifically, in the present embodiment, the transmitter 21 is packaged inside the non-magnetic drill collar to avoid adverse effects of the magnetic field generated by the power drilling tool and the drill bit on the alternating magnetic field generated in the present embodiment, and the transmitter 21 is connected to the drilling sensor also arranged inside the non-magnetic drill collar, and is configured to receive drilling trajectory parameter information acquired by the drilling sensor, and generate the alternating magnetic field according to the drilling trajectory parameter information, so that the distribution change condition of the magnetic force line of the generated alternating magnetic field represents the drilling trajectory parameter information;
in the embodiment, the receiver 22 is disposed at an end of the power drill close to the measurement while drilling apparatus, that is, at one end of the two ends of the power drill close to the measurement while drilling apparatus, and is configured to generate an induced current signal according to the alternating magnetic field generated by the transmitter 21, wherein the distribution change condition of the magnetic lines of force of the alternating magnetic field represents drilling trajectory parameter information, and the induced current signal generated based on the electromagnetic induction principle also represents the drilling trajectory parameter information, so that the receiver 22 can obtain the drilling trajectory parameter information according to the induced current signal and send the drilling trajectory parameter information to the measurement while drilling apparatus.
Preferably, as shown in fig. 3, the transmitter 21 specifically includes: a first data interface 211, a signal modulation device 212, a control device 213, a motor 214, and a magnet 215; wherein,
the first data interface 211 is configured to receive drilling trajectory parameter information sent by a drilling sensor and send the drilling trajectory parameter information to the signal modulation device 212;
the signal modulation device 212 is connected to the first data interface 211, and is configured to modulate the drilling trajectory parameter information to obtain a modulation signal, and send the modulation signal to the control device 213;
the control device 213 is connected with the signal modulation device 212 and is used for controlling the motor 214 to rotate according to the modulation signal;
a motor 214 fixedly connected with the magnet 215 and used for driving the magnet 215 to rotate;
a magnet 215 for generating an alternating magnetic field by rotation.
Specifically, the magnets 215 may be set to one or more according to the need of the information modulation process to generate one or more alternating magnetic fields to characterize the drilling trajectory parameter information; in practical implementation, although the more the magnets 215 are used, the more accurate the information is transmitted, and the higher the speed is, considering that the information modulation device should not generate more heat due to the complex data processing process in the underground high-temperature working environment, the number of the magnets 215 needs to be set reasonably, so as to achieve a certain information transmission precision and transmission speed, and ensure that the information modulation device generates less heat.
Preferably, the magnet 215 used in the present embodiment is a permanent magnet 215.
Specifically, since the magnetic field condition in the downhole is complex and the interference is more, in order to ensure that the receiver 22 in this embodiment can feel the alternating magnetic field with stronger magnetic field strength and avoid the adverse effects of power consumption and heat generation caused by using the electromagnet 215, the permanent magnet 215 is used to generate the alternating magnetic field in this embodiment.
Preferably, as shown in fig. 4, the receiver 22 specifically includes: a coil 221, an amplifier 222, a filter 223, a signal demodulation device 224, and a second data interface 225; wherein,
a coil 221 wound on the outer side of the drill string at the end of the power drill and used for generating an induced current signal according to the alternating magnetic field;
an amplifier 222, connected to the coil 221, for amplifying the induced current signal;
a filter 223 connected to the amplifier 222 for filtering the amplified induced current signal;
the signal demodulating device 224 is connected to the filter 223 and is used for demodulating the induced current signal after filtering processing to obtain drilling trajectory parameter information;
and a second data interface 225, respectively connected to the signal demodulation device 224 and the measurement-while-drilling instrument, for sending the acquired drilling trajectory parameter information to the measurement-while-drilling instrument.
Specifically, fig. 5 is a schematic diagram showing the distribution of magnetic lines of an alternating magnetic field, where the drill string is made of ferromagnetic material, has high magnetic permeability, and has a converging effect on the magnetic lines of the alternating magnetic field generated by the transmitter 21; the power drill is formed by connecting a plurality of drill strings, the coil 221 is wound on the outer side of the drill string at the end part of the power drill and is arranged close to a measurement while drilling instrument, the magnetic flux in the area surrounded by the coil 221 can change along with the change of an alternating magnetic field, induced electromotive force and induced current signals which change along with the alternating magnetic field can be generated, and the induced current signals represent the change condition of the alternating magnetic field and represent drilling track parameter information;
because various magnetic fields (such as a geomagnetic field, a magnetic field generated in the working process of a power drill or a drill bit and the like) exist in the underground environment, magnetic lines of force generated by the various magnetic fields can cause the coil 221 to generate electromagnetic induction, and further generate interference signals, and the filter 223 is arranged in the embodiment to filter the interference signals so as to obtain induced current signals capable of truly reflecting the change condition of the alternating magnetic field;
in this embodiment, the signal demodulating device 224 is adopted to demodulate the filtered induced current signal to obtain the drilling trajectory parameter information, and the demodulation processing performed by the signal demodulating device 224 corresponds to the modulation processing performed by the signal modulating device 212 in the transmitter 21 to obtain the information as consistent as possible with the original drilling trajectory parameter information.
EXAMPLE III
The present embodiment provides a near-bit drilling signal transmission method, as shown in fig. 6, the method including:
step S61, a transmitter receives drilling track parameter information sent by a drilling sensor and generates an alternating magnetic field according to the drilling track parameter information, and the transmitter is sealed in a non-magnetic drill collar between a power drilling tool and a drill bit;
and step S62, the receiver utilizes the alternating magnetic field to generate an induced current signal, drilling track parameter information is obtained according to the induced current signal and is sent to the measurement while drilling instrument, and the receiver is arranged at the end part of the power drilling tool close to the measurement while drilling instrument.
The method is based on an electromagnetic induction principle, an alternating magnetic field is generated by a transmitter close to a drill bit according to modulated drilling track parameters, magnetic lines of the alternating magnetic field are converged by a drill column of a power drilling tool, an induced current signal is generated by a receiver close to a measurement while drilling instrument according to the alternating magnetic field, and drilling track parameter information is acquired according to the induced current signal.
Preferably, as shown in fig. 7, the generating an alternating magnetic field according to the drilling trajectory parameter information in step S61 includes:
step S71, modulating the drilling track parameter information to obtain a modulation signal;
and step S72, controlling the magnet to rotate according to the modulation signal so as to generate an alternating magnetic field.
Specifically, after the drilling track parameter information is modulated, a modulation signal which represents the drilling track parameter information and has a simple expression form can be obtained, and when the modulation signal is used for controlling the magnet to rotate, the magnetic field generated by the magnet is changed alternately, so that an alternating magnetic field is formed.
Preferably, in step S71, the modulating process is performed on the drilling trajectory parameter information, specifically: and performing Binary Phase Shift Keying (2 PSK for short) modulation processing on the drilling trajectory parameter information.
Specifically, after the drilling trajectory parameter information is modulated according to a 2PSK modulation mode, the obtained modulation signal is binary coded information, namely coded information consisting of '0' or '1', the modulation processing algorithm is simple, and when the signal modulation device of the transmitter adopts the 2PSK modulation mode, a large amount of heat cannot be generated due to the complex algorithm, so that the underground high-temperature operation is facilitated.
Preferably, in step S72, the magnet is controlled to rotate to generate an alternating magnetic field, specifically:
controlling a direction of rotation of the magnet; and/or the presence of a gas in the gas,
controlling the speed at which the magnet rotates; and/or the presence of a gas in the gas,
controlling the magnet to start or stop rotating.
Specifically, in this embodiment, the alternating magnetic field may be generated by individually controlling the rotation direction of the magnet, the rotation speed of the magnet, whether the magnet rotates, or by mixing the above two or three methods, but considering the operation in the high temperature environment in the well, it is ensured that the control device of the transmitter does not generate high heat due to the complicated control process, and in actual implementation, the magnet should be controlled to rotate in a simple manner as much as possible;
for example, in this embodiment, a 2PSK modulation method may be used to modulate the drilling trajectory parameter information, and a control magnet may be used to generate the alternating magnetic field in the rotation direction, for example, when the encoded information corresponding to the modulation signal is "0", the control magnet may rotate clockwise at a speed of 20 revolutions per second, and when the encoded information corresponding to the modulation signal is "1", the control magnet may rotate counterclockwise at a speed of 20 revolutions per second, and the frequency of the generated alternating magnetic field may be 20 Hz.
In summary, the near-bit drilling signal transmission system, the near-bit drilling signal transmission device and the near-bit drilling signal transmission method provided by the embodiments of the present invention have the following beneficial effects:
(1) the cable does not need to be embedded in the groove of the power drilling tool, and the mechanical strength of the power drilling tool is not influenced;
(2) the signal transmission process is not influenced by nearby stratums and drilling fluid, wireless communication can be carried out in the drilling fluid with high salinity, and a transmission channel is stable;
(3) the transmission rate can reach 20bits/s, the transmission distance can reach 20m, the transmission distance is long, the transmission rate is high, and the error rate is low.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. A near-bit drilling signal transmission system, comprising: the device comprises a drilling sensor, a transmitter, a receiver and a measurement while drilling instrument; wherein,
the drilling sensor is packaged in the non-magnetic drill collar between the power drilling tool and the drill bit and used for measuring drilling track parameter information and sending the information to the transmitter;
the transmitter is packaged in the non-magnetic drill collar between the power drilling tool and the drill bit, is connected with the drilling sensor and is used for generating an alternating magnetic field according to the drilling track parameter information;
the receiver is arranged at the end part of the power drilling tool close to the measurement while drilling instrument and used for generating an induced current signal by using the alternating magnetic field, acquiring drilling track parameter information according to the induced current signal and sending the drilling track parameter information to the measurement while drilling instrument;
the measurement while drilling instrument is arranged between the power drilling tool and the ground and is used for sending the drilling track parameter information to a ground receiver;
the transmitter body includes: the device comprises a first data interface, a signal modulation device, a control device, a motor and a permanent magnet; wherein,
the first data interface is used for receiving drilling track parameter information sent by a drilling sensor and sending the drilling track parameter information to the signal modulation device;
the signal modulation device is connected with the first data interface and used for carrying out binary phase shift keying (2 PSK) modulation processing on the drilling trajectory parameter information to obtain a modulation signal and sending the modulation signal to the control device;
the control device is connected with the signal modulation device and is used for controlling the motor to rotate according to the modulation signal;
the motor is fixedly connected with the permanent magnet and is used for driving the permanent magnet to rotate;
a permanent magnet for generating an alternating magnetic field by rotation;
the control device controls the direction, and/or speed, and/or starts or stops rotation of the permanent magnet by controlling the motor.
2. A near-bit drilling signal transmission device, comprising: a transmitter and a receiver; wherein,
the transmitter is packaged in a non-magnetic drill collar arranged between the power drilling tool and the drill bit, is connected with the drilling sensor, and is used for receiving drilling track parameter information sent by the drilling sensor and generating an alternating magnetic field according to the drilling track parameter information;
the receiver is arranged at the end part of the power drilling tool close to the measurement while drilling instrument and used for generating an induced current signal by using the alternating magnetic field, acquiring the drilling track parameter information according to the induced current signal and sending the acquired drilling track parameter information to the measurement while drilling instrument;
wherein the transmitter body includes: the device comprises a first data interface, a signal modulation device, a control device, a motor and a permanent magnet; wherein,
the first data interface is used for receiving drilling track parameter information sent by a drilling sensor and sending the drilling track parameter information to the signal modulation device;
the signal modulation device is connected with the first data interface and used for carrying out binary phase shift keying (2 PSK) modulation processing on the drilling trajectory parameter information to obtain a modulation signal and sending the modulation signal to the control device;
the control device is connected with the signal modulation device and is used for controlling the motor to rotate according to the modulation signal;
the motor is fixedly connected with the permanent magnet and is used for driving the permanent magnet to rotate;
a permanent magnet for generating an alternating magnetic field by rotation;
the control device controls the direction, and/or speed, and/or starts or stops rotation of the permanent magnet by controlling the motor.
3. The device of claim 2, wherein the receiver specifically comprises: the coil, the amplifier, the filter, the signal demodulation device and the second data interface; wherein,
the coil is wound on the outer side of a drill string at the end part of the power drill and is used for generating an induced current signal according to the alternating magnetic field;
the amplifier is connected with the coil and used for amplifying the induced current signal;
the filter is connected with the amplifier and is used for filtering the amplified induced current signal;
the signal demodulation device is connected with the filter and is used for demodulating the induced current signal after filtering processing so as to obtain drilling track parameter information;
and the second data interface is respectively connected with the signal demodulation device and the measurement-while-drilling instrument and is used for sending the acquired drilling track parameter information to the measurement-while-drilling instrument.
4. A near-bit drilling signal transmission method for the near-bit drilling signal transmission system of claim 1, the near-bit drilling signal transmission method comprising:
the transmitter receives drilling track parameter information sent by a drilling sensor, performs two-phase shift keying (2 PSK) modulation processing on the drilling track parameter information to obtain a modulation signal, controls the permanent magnet to rotate according to the modulation signal to generate an alternating magnetic field, and is packaged in a non-magnetic drill collar between a power drilling tool and a drill bit;
the receiver generates an induced current signal by using the alternating magnetic field, acquires drilling track parameter information according to the induced current signal and sends the drilling track parameter information to the measurement-while-drilling instrument, and the receiver is arranged at the end part of the power drilling tool close to the measurement-while-drilling instrument;
wherein, control permanent magnet rotation is in order to produce alternating magnetic field, specifically is:
controlling the direction of rotation of the permanent magnet; and/or the presence of a gas in the gas,
controlling the speed of rotation of the permanent magnet; and/or the presence of a gas in the gas,
and controlling the permanent magnet to start or stop rotating.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210458259.1A CN102937022B (en) | 2012-11-14 | 2012-11-14 | System, device and method for transmitting near-bit drilling signals |
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| CN201210458259.1A CN102937022B (en) | 2012-11-14 | 2012-11-14 | System, device and method for transmitting near-bit drilling signals |
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