CN103701434B - A kind of frequency modulation device for LWD resistivity log and method - Google Patents
A kind of frequency modulation device for LWD resistivity log and method Download PDFInfo
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- CN103701434B CN103701434B CN201310697774.XA CN201310697774A CN103701434B CN 103701434 B CN103701434 B CN 103701434B CN 201310697774 A CN201310697774 A CN 201310697774A CN 103701434 B CN103701434 B CN 103701434B
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Abstract
A kind of frequency modulation device for LWD resistivity log and method, frequency tuning can be automatically carried out before LWD resistivity log device measures, circuit, the parameter of regulation components and parts are rationally set, to ensure preferable sensitivity, LWD resistivity log device is made to work under optimum resonant frequency.Even if when temperature or other ambient parameters change, can also be adjusted in time, to adapt to the change of ambient parameters, efficiently avoid traditional LWD resistivity log device its optimum resonant frequency in real work not to be inconsistent with pre-set resonant frequency, cause measurement problem the most accurately, drastically increase the accuracy of LWD resistivity log measurement device data.
Description
Technical field
The present invention relates to oil, Natural Gas Drilling Operation measurement while drilling field, specifically one is used for
The frequency modulation device of LWD resistivity log and method.
Background technology
Along with the whole world to oil, Natural Gas Demand increasing, LWD resistivity log device has had length
The progress and development of foot.Being a kind of conventional LWD resistivity log device as shown in Figure 1, it includes one
Individual drilling rod 100 and a drill bit 101, and be used for for a pair sending the electromagnetic signal transmitting to surrounding formation
Device T1 and T2, a pair for receiving receptor R1 and R2 of electromagnetic signal.Measure through receptor R1
With the electromagnetic signal of R2, the i.e. available formation resistivity away from drilling rod certain distance.By receptor R1 and
R2 is placed in different positions, it is possible to realizes the detection of different investigation depth, rationally arranges receptor R1
Spacing with R2, it is possible to obtain preferably vertical resolution.
Owing to emitter T1 and T2 is generally operational in plural frequency, it is assumed that operating frequency is f1
And f2, need by its frequency with R1 and R2 in advance be tuned to suitable Frequency point, to improve signal
It is sent to the signal to noise ratio of system.This tuning process is generally tuned by dual resonant frequencies as shown in Figure 2
Circuit completes, and described dual resonant frequencies tuning circuit includes the aerial coil 201 of logging while drilling apparatus；Adjust
Humorous inducer L1, capacitor C2, another tuning capacitor C1 in parallel therewith and described tuning coil
Device L1 equivalent parallel also connects described aerial coil 201；Transformator 202 and work for impedance matching
Make the emission source 203 in fixed frequency.Dual resonant frequencies tuning circuit shown in Fig. 2 can tuned produce
Raw two resonant frequencies, shown in solid as in Fig. 3.It is known that LWD resistivity log device is usual
It is operated within the scope of the widest temperature, such as-40 DEG C to 150 DEG C.Therefore, antenna and tuning circuit is humorous
Vibration frequency likely changes with temperature and other ambient parameter, as shown by the dotted line in fig. 3, due to
The change gain of temperature reduces, and resonance curve significantly moves down.Due to aerial coil frequency the most all
Good in factory set, will not be adjusted as the case may be when actually used, cause the most whole
Individual LWD resistivity log device will have relatively low sensitivity and signal to noise ratio, and then makes resistivity measurement not
Accurately, particularly in high resistivity stratum.
Summary of the invention
To this end, the technical problem to be solved is when temperature or other ambient parameters become
During change, LWD resistivity log instrument optimum resonant frequency is not inconsistent with pre-set resonant frequency, causes
Make measurement accurate not, thus propose one can before LWD resistivity log instrument is tested from
The dynamic frequency modulation device for LWD resistivity log and the method carrying out frequency tuning.
For solving above-mentioned technical problem, the present invention adopts the following technical scheme that realization.
A kind of frequency modulation device for LWD resistivity log, including:
Reception antenna, is arranged on the drilling tool sleeve on the axial direction of receiver module, is used for receiving electromagnetism
Ripple signal, described electromagnetic wave signal is converted into the signal of telecommunication by described receiver module；
Range detector, is connected with described receiver module, for detecting the amplitude of the described signal of telecommunication of acquisition
Information is also sent to controller；
Described controller, connects described range detector, for calculating Amplitude Ration according to described amplitude information
And/or phase contrast, determine optimum resonant frequency, and control transmitter module and carry out frequency adjustment；
Described transmitter module, is connected with described controller, is used for controlling to launch antenna according to optimum resonance frequency
Rate electromagnetic signals.
The most described transmitter module also includes:
First signal generator, is connected with described controller, send first frequency signal to power amplifier,
The frequency of wherein said first frequency signal and phase place can be controlled by described controller；
Power amplifier, is connected with described first signal generator, amplifies described first frequency signal and passes
Pass transmitting tuning circuit；
Described transmitting tuning circuit, one end is connected with described power amplifier, other end coupling firing antenna,
Control described transmitting antenna according to optimum resonant frequency electromagnetic signals.
The most described receiver module also includes:
Receive tuning circuit, be connected with described reception antenna, be used for receiving described electromagnetic wave signal, conversion
Become the signal of telecommunication, and be sent to low-noise amplifier；
Described low-noise amplifier, is connected with described reception tuning circuit, is amplified by the described signal of telecommunication concurrent
Give frequency mixer；
Secondary signal generator, is connected with described controller, is used for sending second frequency signal to described mixed
Frequently device, the frequency of wherein said second frequency signal and phase place can be controlled by described controller；
Described frequency mixer, is connected with described low-noise amplifier and described secondary signal generator respectively, will
The described signal of telecommunication and described second frequency signal hybrid concurrency give intermediate-frequency filter；
Described intermediate-frequency filter, is connected with described frequency mixer, filters high fdrequency component, and is sent to intermediate frequency and puts
Big device；
Described intermediate frequency amplifier, is connected with described intermediate-frequency filter, amplifies and obtains the described signal of telecommunication, sends out
Give described range detector.
The most described transmitting tuning circuit is conventional dual resonant frequencies tuning circuit.
The most also include active module, whole with boring electricity for automatically turning on according to certain active mode
The frequency modulation device that resistance rate is measured.
The quantity of the most described transmitting antenna can be one, two or more.
The most described controller is microprocessor or digital signal processor.
A kind of frequency modulation method for LWD resistivity log, comprises the steps:
S1: reception antenna receives electromagnetic wave signal, and described electromagnetic wave signal is converted into telecommunications by receiver module
Number；
S2: range detector detects the amplitude information of the described signal of telecommunication obtained and is sent to controller；
S3: described controller calculates Amplitude Ration and/or phase contrast according to described amplitude information, determines optimum humorous
Vibration frequency, and control transmitter module and carry out frequency adjustment；
S4: described transmitter module controls to launch antenna according to optimum resonant frequency electromagnetic signals.
The most described step S4 specifically includes:
S41: the first signal generator transmission first frequency signal is to power amplifier, and wherein said first frequently
The frequency of rate signal and phase place can be controlled by described controller；
S42: power amplifier amplifies described first frequency signal and passes to launch tuning circuit；
S43: described transmitting tuning circuit controls described transmitting antenna and launches electromagnetic wave according to optimum resonant frequency
Signal.
The most described step S1 specifically includes:
S11: receive tuning circuit and receive described electromagnetic wave signal, be converted into the signal of telecommunication, and be sent to low noise
Acoustic amplifier；
The described signal of telecommunication is amplified and is sent to frequency mixer by described low-noise amplifier；
Secondary signal generator sends second frequency signal to be believed to described frequency mixer, wherein said second frequency
Number frequency and phase place can be controlled by described controller；
During described second signal of telecommunication and described second frequency signal hybrid concurrency are given by S12: described frequency mixer
Frequently wave filter；
S13: described intermediate-frequency filter filters high fdrequency component, and is sent to intermediate frequency amplifier；
S14: described intermediate frequency amplifier amplifies and obtains the described signal of telecommunication, is sent to described range detector.
The most described transmitting tuning circuit is conventional dual resonant frequencies tuning circuit.
The most also include activating step, automatically turn on whole resistivity logging while drilling according to certain active mode
The frequency modulation device measured.
The most described active mode includes design temperature threshold value, exceedes described temperature threshold and automatically turns on
The frequency modulation device of whole LWD resistivity log.
The most described active mode includes setting the time cycle, automatically turns on according to the described time cycle
The frequency modulation device of whole LWD resistivity log.
The quantity of the most described transmitting antenna can be one, two or more.
The most described controller is microprocessor or digital signal processor.
The technique scheme of the present invention has the advantage that compared to existing technology
(1) a kind of frequency modulation device for LWD resistivity log of the present invention and method, Ke Yi
LWD resistivity log device carries out frequency tuning before measuring automatically, rationally arranges circuit, regulation
The parameter of components and parts, to ensure preferable sensitivity, makes LWD resistivity log device at optimum resonance frequency
Work under rate.Even if when temperature or other ambient parameters change, it is also possible to be adjusted in time,
To adapt to the change of ambient parameters, efficiently avoid traditional LWD resistivity log device in reality
In the work of border, its optimum resonant frequency is not inconsistent with pre-set resonant frequency, causes measurement the most accurate
Problem, drastically increase the accuracy of LWD resistivity log measurement device data.
(2) a kind of frequency modulation device for LWD resistivity log of the present invention and method, in conjunction with
The own characteristic boring resistivity measurement instrument provides the mode of multiple activation frequency modulation device.It is preferably and arranges
Temperature threshold with set activation cycle two kinds, i.e. when variations in temperature reach given threshold value or when reach frequency
When rate optimizes a given cycle, automatically begin to LWD resistivity log instrument is carried out frequency tuning.
When finding optimum resonant frequency, perform according to optimum resonant frequency.Can set according to different situations
Determine and select, there is great motility.
(3) a kind of frequency modulation device for LWD resistivity log of the present invention and method, overall electricity
Line structure is simple, and selected components and parts are in prior art conventional use of, it is easy to accomplish, permissible
Meet the industry demand to use cost.
Accompanying drawing explanation
In order to make present disclosure be more likely to be clearly understood, being embodied as below according to the present invention
Example also combines accompanying drawing, and the present invention is further detailed explanation, wherein
Fig. 1 is a kind of LWD resistivity log instrument of the prior art；
Fig. 2 is a kind of dual resonant frequencies tuning circuit of the prior art；
Fig. 3 is the resonance curve drift schematic diagram shown in Fig. 2；
Fig. 4 is the structure chart of the frequency modulation device for LWD resistivity log described in a kind of embodiment；
Fig. 5 is the dual resonant frequencies tuning circuit described in a kind of embodiment；
Fig. 6 is the optimum resonant frequency dynamic tuning process schematic described in a kind of embodiment；
Fig. 7 is the frequency modulation method flow chart for LWD resistivity log described in a kind of embodiment.
In figure, reference is expressed as: 100-drill string, 101-drill bit, 201-aerial coil, 202-transformation
Device, the emission source of 203-fixed frequency, 701-controller, 702-the first signal generator, 703-
Binary signal generator, 704-power amplifier, 705-launches tuning circuit, and 706-launches antenna, 707-
Frequency mixer, 708-low-noise amplifier, 709-receives tuning circuit, 710-reception antenna, 711-intermediate frequency
Wave filter, 712-intermediate frequency amplifier, 713-range detector, the optimum resonant frequency that 501-is previous, 502-
Current optimum resonant frequency curve.
Detailed description of the invention
Embodiment 1
A kind of frequency modulation device for LWD resistivity log described in the present embodiment, as shown in Figure 4, bag
Include:
Reception antenna 710, is arranged on the drilling tool sleeve on the axial direction of receiver module, is used for receiving electricity
Magnetostatic wave signal, described electromagnetic wave signal is converted into the signal of telecommunication by described receiver module；Range detector 713,
It is connected with described receiver module, for detecting the amplitude information of the described signal of telecommunication of acquisition and being sent to control
Device 701；Described controller 701 connects described range detector 713, based on according to described amplitude information
Calculate Amplitude Ration and/or phase contrast, determine optimum resonant frequency, and control transmitter module and carry out frequency adjustment；
Described transmitter module, is connected with described controller 701, is used for controlling to launch antenna 706 humorous according to optimum
Vibration frequency electromagnetic signals.
It is known that when resonance circuit natural resonance frequency with the frequency of signal source identical time, circuit shakes
Width is also up to peak value, and the oscillating current produced in circuit is the strongest.The present embodiment utilizes this principle just,
By the frequency of controller control break resonance circuit, transmitting antenna is then made to send out according to optimum resonant frequency
Radio magnetostatic wave signal.
The frequency modulation device for LWD resistivity log described in the present embodiment, can survey at resistivity logging while drilling
Amount device carries out frequency tuning before measuring automatically, rationally arranges circuit, the parameter of regulation components and parts,
To ensure preferable sensitivity, LWD resistivity log device is made to work under optimum resonant frequency.Even if
When temperature or other ambient parameters change, it is also possible to be adjusted in time, to adapt to ring around
The change of border parameter, it is in real work to efficiently avoid traditional LWD resistivity log device
Excellent resonant frequency is not inconsistent with pre-set resonant frequency, causes measurement problem the most accurately, greatly
Improve the accuracy of LWD resistivity log measurement device data.
4 it is specifically described a kind of tune for LWD resistivity log described in the present embodiment below in conjunction with the accompanying drawings
Frequently device.Described transmitter module also includes: the first signal generator 702, is connected with described controller 701,
Transmission first frequency signal is to power amplifier 704, and frequency and the phase place of wherein said first frequency signal can
To be controlled by described controller 701；Described power amplifier 704, with described first signal generator 702
Connect, amplify described first frequency signal and pass to launch tuning circuit 705；Described transmitting tuning circuit
705, one end is connected with described power amplifier 704, other end coupling firing antenna 706, controls described
Launch antenna 706 according to optimum resonant frequency electromagnetic signals.
Described receiver module also includes: receives tuning circuit 709, is connected with described reception antenna 710, uses
In receiving described electromagnetic wave signal, it is converted into the signal of telecommunication, and is sent to low-noise amplifier 708；Described low
Noise amplifier 708, is connected with described reception tuning circuit 709, is amplified by the described signal of telecommunication and be sent to
Frequency mixer 707；Secondary signal generator 703, is connected with described controller 701, for sending the second frequency
Rate signal gives described frequency mixer 707, and the frequency of wherein said second frequency signal and phase place can be by described controls
Device 701 processed controls；Described frequency mixer 707, respectively with described low-noise amplifier 708 and described second letter
Number generator 703 connects, and is mixed with described second frequency signal by the described signal of telecommunication, and is sent to intermediate frequency
Wave filter；Described intermediate-frequency filter 711, is connected with described frequency mixer 707, filters high fdrequency component, concurrently
Give intermediate frequency amplifier 712；Described intermediate frequency amplifier 712, is connected with described intermediate-frequency filter 711, puts
The big described signal of telecommunication, is sent to described range detector 713.
The setting value of the frequency values of wherein said first frequency signal and described second frequency signal, is
The numerical value selection that those skilled in the art are conventional, it is only necessary to ensure to receive the bandwidth of tuning circuit enough,
Do not repeating.
Described transmitting tuning circuit is conventional dual resonant frequencies tuning circuit.As it is shown in figure 5, include: become
Depressor 402, is connected with described power amplifier, for producing mutual inductance effect with described power amplifier, produces
Raw optimum resonant frequency signal；Tuning coil device L1, with described transformer series；Capacitor C2, with institute
State tuning coil device L1 in parallel；Tuning capacitor C1, one end is connected with described tuning coil device L1, and one
End couples with described transmitting antenna.Difference with Fig. 2 is the signal frequency that described power amplifier sends
It is variable, therefore it can obtain optimum resonant frequency dynamically.By Fig. 6 it appeared that previous optimum
Resonant frequency curve 501 has occurred and that skew, after frequency tuning, again finds current optimum humorous
Vibration frequency curve 502, it is ensured that LWD resistivity log instrument works under optimum resonant frequency.
The present embodiment also includes active module, automatically turns on whole resistivity logging while drilling according to certain active mode
The frequency modulation device measured.Described active mode includes design temperature threshold value, exceedes described temperature threshold automatic
Open the frequency modulation device of whole LWD resistivity log.Preferably passed by described active module built-in temperature
Sensor realizes.The most described active mode can also include setting the time cycle, according to week described time
Phase automatically turns on the frequency modulation device of whole LWD resistivity log.Certainly also have some other active mode,
Do not repeating.Those skilled in the art are it is to be understood that above-mentioned active mode is intended to fully say
Bright the present embodiment, is not intended to limit the present embodiment, and other obvious active modes are also in this reality
Within executing the protection domain of example.
The frequency modulation device for LWD resistivity log described in the present embodiment, in conjunction with LWD resistivity log
The own characteristic of instrument provides the mode of multiple activation frequency modulation device.Temperature threshold is preferably set and sets
Fix time the cycle two kinds, i.e. when variations in temperature reach given threshold value or when reach frequency optimization one to
During the fixed cycle, automatically begin to LWD resistivity log instrument is carried out frequency tuning.Optimum humorous when finding
Vibration frequency, performs according to optimum resonant frequency.Can be set according to different situations and select, tool
There is great motility.
The quantity of described transmitting antenna can be one, two or more.The present embodiment is preferably two.
Those skilled in the art it is to be understood that quantity set herein is intended merely to absolutely prove the present embodiment, and
Non-be used for limit the present embodiment, other obvious number change all the present embodiment protection domain it
In.
Described controller is microprocessor or digital signal processor.Other such as range detector,
One signal generator, power amplifier, low-noise amplifier, secondary signal generator, frequency mixer, in
Frequently wave filter, intermediate frequency amplifier etc. all can be selected for conventional components and parts, those skilled in the art it is to be understood that
So place is not repeating.
The frequency modulation device for LWD resistivity log described in the present embodiment, integrated circuit simple in construction,
Selected components and parts are in prior art conventional use of, it is easy to accomplish, industry can be met to making
By the demand of cost.
Embodiment 2
A kind of frequency modulation method for LWD resistivity log described in the present embodiment, as it is shown in fig. 7, bag
Include following steps:
S1: reception antenna receives electromagnetic wave signal, and described electromagnetic wave signal is converted into telecommunications by receiver module
Number；
S2: range detector detects the amplitude information of the described signal of telecommunication obtained and is sent to controller；
S3: described controller calculates Amplitude Ration and/or phase contrast according to described amplitude information, determines optimum humorous
Vibration frequency, and control transmitter module and carry out frequency adjustment；
S4: described transmitter module controls to launch antenna according to optimum resonant frequency electromagnetic signals.
It is known that when resonance circuit natural resonance frequency with the frequency of signal source identical time, circuit shakes
Width is also up to peak value, and the oscillating current produced in circuit is the strongest.The present embodiment utilizes this principle just,
By the frequency of controller control break resonance circuit, transmitting antenna is then made to send out according to optimum resonant frequency
Radio magnetostatic wave signal.
The frequency modulation method for LWD resistivity log described in the present embodiment, can survey at resistivity logging while drilling
Amount device carries out frequency tuning before measuring automatically, rationally arranges circuit, the parameter of regulation components and parts,
To ensure preferable sensitivity, LWD resistivity log device is made to work under optimum resonant frequency.Even if
When temperature or other ambient parameters change, it is also possible to be adjusted in time, to adapt to ring around
The change of border parameter, it is in real work to efficiently avoid traditional LWD resistivity log device
Excellent resonant frequency is not inconsistent with pre-set resonant frequency, causes measurement problem the most accurately, greatly
Improve the accuracy of LWD resistivity log measurement device data.
Illustrate a kind of frequency modulation method for LWD resistivity log described in the present embodiment in detail below.Institute
State step S4 to specifically include:
S41: the first signal generator transmission first frequency signal is to power amplifier, and wherein said first frequently
The frequency of rate signal and phase place can be controlled by described controller；
S42: power amplifier amplifies described first frequency signal and passes to launch tuning circuit；
S43: described transmitting tuning circuit controls described transmitting antenna and launches electromagnetic wave according to optimum resonant frequency
Signal.
Described step S1 specifically includes:
S11: receive tuning circuit and receive described electromagnetic wave signal, be converted into the signal of telecommunication, and be sent to low noise
Acoustic amplifier；
The described signal of telecommunication is amplified and is sent to frequency mixer by described low-noise amplifier；
Secondary signal generator sends second frequency signal to be believed to described frequency mixer, wherein said second frequency
Number frequency and phase place can be controlled by described controller；
During described second signal of telecommunication and described second frequency signal hybrid concurrency are given by S12: described frequency mixer
Frequently wave filter；
S13: described intermediate-frequency filter filters high fdrequency component, and is sent to intermediate frequency amplifier；
S14: described intermediate frequency amplifier amplifies and obtains the described signal of telecommunication, is sent to described range detector.
The setting value of the frequency values of wherein said first frequency signal and described second frequency signal, is
The numerical value selection that those skilled in the art are conventional, it is only necessary to ensure to receive the bandwidth of tuning circuit enough,
Do not repeating.
Described transmitting tuning circuit is conventional dual resonant frequencies tuning circuit.As it is shown in figure 5, include: become
Depressor 402, is connected with described power amplifier, for producing mutual inductance effect with described power amplifier, produces
Raw optimum resonant frequency signal；Tuning coil device L1, with described transformer series；Capacitor C2, with institute
State tuning coil device L1 in parallel；Tuning capacitor C1, one end is connected with described tuning coil device L1, and one
End couples with described transmitting antenna.Difference with Fig. 2 is the signal frequency that described power amplifier sends
It is variable, therefore it can obtain optimum resonant frequency dynamically.By Fig. 6 it appeared that previous optimum
Resonant frequency curve 501 has occurred and that skew, after frequency tuning, again finds current optimum humorous
Vibration frequency curve 502, it is ensured that LWD resistivity log instrument works under optimum resonant frequency.
The present embodiment also includes activating step, automatically turns on whole resistivity logging while drilling according to certain active mode
The frequency modulation device measured.Described active mode includes design temperature threshold value, exceedes described temperature threshold automatic
Open the frequency modulation device of whole LWD resistivity log.Preferably passed by described active module built-in temperature
Sensor realizes.The most described active mode can also include setting the time cycle, according to week described time
Phase automatically turns on the frequency modulation device of whole LWD resistivity log.Certainly also have some other active mode,
Do not repeating.Those skilled in the art are it is to be understood that above-mentioned active mode is intended to fully say
Bright the present embodiment, is not intended to limit the present embodiment, and other obvious active modes are also in this reality
Within executing the protection domain of example.
The frequency modulation method for LWD resistivity log described in the present embodiment, in conjunction with LWD resistivity log
The own characteristic of instrument provides the mode of multiple activation frequency modulation device.Temperature threshold is preferably set and sets
Determine activation cycle two kinds, i.e. when variations in temperature reach given threshold value or when reach frequency optimization one to
During the fixed cycle, automatically begin to LWD resistivity log instrument is carried out frequency tuning.Optimum humorous when finding
Vibration frequency, performs according to optimum resonant frequency.Can be set according to different situations and select, tool
There is great motility.
The quantity of described transmitting antenna can be one, two or more.The present embodiment is preferably two.
Those skilled in the art it is to be understood that quantity set herein is intended merely to absolutely prove the present embodiment, and
Non-be used for limit the present embodiment, other obvious number change all the present embodiment protection domain it
In.
Described controller is microprocessor or digital signal processor.Other such as range detector,
One signal generator, power amplifier, low-noise amplifier, secondary signal generator, frequency mixer, in
Frequently wave filter, intermediate frequency amplifier etc. all can be selected for conventional components and parts, those skilled in the art it is to be understood that
So place is not repeating.
The frequency modulation method for LWD resistivity log described in the present embodiment, integrated circuit simple in construction,
Selected components and parts are in prior art conventional use of, it is easy to accomplish, industry can be met to making
By the demand of cost.
Obviously, above-described embodiment is only for clearly demonstrating example, and not to embodiment
Restriction.For those of ordinary skill in the field, can also do on the basis of the above description
Go out change or the variation of other multi-form.Here without also cannot all of embodiment be given exhaustive.
And the obvious change thus extended out or variation still in the invention protection domain it
In.
Claims (12)
1. the frequency modulation device for LWD resistivity log, it is characterised in that including:
Reception antenna, is arranged on the drilling tool sleeve on the axial direction of receiver module, for reception
One electromagnetic wave signal, described first electromagnetic wave signal is converted into first signal of telecommunication by described receiver module；
Range detector, is connected with described receiver module, for detecting described first signal of telecommunication of acquisition
Amplitude information and be sent to controller；
Described controller, connects described range detector, for calculating amplitude according to described amplitude information
Than and/or phase contrast, determine optimum resonant frequency, and control transmitter module and carry out frequency adjustment；
Described transmitter module, is connected with described controller, is used for controlling to launch antenna according to optimum resonance
Frequency launches the second electromagnetic wave signal；
Described transmitter module also includes:
First signal generator, is connected with described controller, sends first frequency signal to power amplification
Device, the frequency of wherein said first frequency signal and phase place can be controlled by described controller；
Power amplifier, is connected with described first signal generator, amplifies described first frequency signal also
Pass to launch tuning circuit；
Described transmitting tuning circuit, one end is connected with described power amplifier, other end coupling firing sky
Line, controls described transmitting antenna and launches the second electromagnetic wave signal according to optimum resonant frequency；
Described receiver module also includes:
Receive tuning circuit, be connected with described reception antenna, be used for receiving described first electromagnetic wave signal,
It is converted into first signal of telecommunication, and is sent to low-noise amplifier；
Described low-noise amplifier, is connected with described reception tuning circuit, is put by described first signal of telecommunication
Big and be sent to frequency mixer；
Secondary signal generator, is connected with described controller, is used for sending second frequency signal to described
Frequency mixer, the frequency of wherein said second frequency signal and phase place can be controlled by described controller；
Described frequency mixer, is connected with described low-noise amplifier and described secondary signal generator respectively,
The signal of telecommunication exported by described low-noise amplifier and described second frequency signal hybrid concurrency give intermediate frequency
Wave filter；
Described intermediate-frequency filter, is connected with described frequency mixer, filters high fdrequency component, and is sent to intermediate frequency
Amplifier；
Described intermediate frequency amplifier, is connected with described intermediate-frequency filter, amplifies and obtains second signal of telecommunication,
It is sent to described range detector；
Described transmitting tuning circuit is conventional dual resonant frequencies tuning circuit.
Frequency modulation device for LWD resistivity log the most according to claim 1, its feature exists
In, also include active module, survey for automatically turning on whole resistivity logging while drilling according to certain active mode
The frequency modulation device of amount.
Frequency modulation device for LWD resistivity log the most according to claim 1, its feature exists
In, the quantity of described transmitting antenna can be one or more.
4. according to the frequency modulation device for LWD resistivity log described in any one of claim 1-3,
It is characterized in that, described controller is microprocessor or digital signal processor.
5. the frequency modulation method for LWD resistivity log, it is characterised in that comprise the steps:
S1: reception antenna receives the first electromagnetic wave signal, and receiver module is by described first electromagnetic wave signal
It is converted into first signal of telecommunication；
S2: range detector detects the amplitude information of described first signal of telecommunication obtained and is sent to control
Device；
S3: described controller calculates Amplitude Ration and/or phase contrast according to described amplitude information, determines optimum
Resonant frequency, and control transmitter module and carry out frequency adjustment；
S4: described transmitter module controls to launch antenna and launches the second electromagnetic wave letter according to optimum resonant frequency
Number；
Described step S4 specifically includes:
S41: the first signal generator send first frequency signal to power amplifier, wherein said first
The frequency of frequency signal and phase place can be controlled by described controller；
S42: power amplifier amplifies described first frequency signal and passes to launch tuning circuit；
S43: described transmitting tuning circuit controls described transmitting antenna and launches second according to optimum resonant frequency
Electromagnetic wave signal.
Frequency modulation method for LWD resistivity log the most according to claim 5, its feature exists
In, described step S1 specifically includes:
S11: receive tuning circuit and receive described first electromagnetic wave signal, be converted into first signal of telecommunication, and
It is sent to low-noise amplifier；
Described first signal of telecommunication is amplified and is sent to frequency mixer by described low-noise amplifier；
Secondary signal generator sends second frequency signal to described frequency mixer, wherein said second frequency
The frequency of signal and phase place can be controlled by described controller；
S12: the signal of telecommunication that described low-noise amplifier is exported by described frequency mixer is believed with described second frequency
Number hybrid concurrency gives intermediate-frequency filter；
S13: described intermediate-frequency filter filters high fdrequency component, and is sent to intermediate frequency amplifier；
S14: described intermediate frequency amplifier amplifies and obtains second signal of telecommunication, is sent to described range detector.
Frequency modulation method for LWD resistivity log the most according to claim 5, its feature exists
In, described transmitting tuning circuit is conventional dual resonant frequencies tuning circuit.
Frequency modulation method for LWD resistivity log the most according to claim 5, its feature exists
In, also include activating step, automatically turn on whole LWD resistivity log according to certain active mode
Frequency modulation device.
Frequency modulation method for LWD resistivity log the most according to claim 8, its feature exists
In, described active mode includes design temperature threshold value, exceed described temperature threshold automatically turn on whole with
Bore the frequency modulation device of resistivity measurement.
Frequency modulation method for LWD resistivity log the most according to claim 8, its feature exists
Include setting the time cycle in, described active mode, according to the described time cycle automatically turn on whole with
Bore the frequency modulation device of resistivity measurement.
11. frequency modulation methods for LWD resistivity log according to claim 5, its feature exists
In, the quantity of described transmitting antenna can be one or more.
12. according to the frequency modulation method for LWD resistivity log described in any one of claim 5-11,
It is characterized in that, described controller is microprocessor or digital signal processor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310697774.XA CN103701434B (en) | 2013-12-18 | 2013-12-18 | A kind of frequency modulation device for LWD resistivity log and method |
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| CN201310697774.XA CN103701434B (en) | 2013-12-18 | 2013-12-18 | A kind of frequency modulation device for LWD resistivity log and method |
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| CN103701434A CN103701434A (en) | 2014-04-02 |
| CN103701434B true CN103701434B (en) | 2016-09-28 |
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| CN107152275A (en) * | 2016-03-02 | 2017-09-12 | 中国石油化工股份有限公司 | Impedance matching circuit and with bore electromagnetic resistivity measuring instrument |
| CN107152276B (en) * | 2016-03-02 | 2020-06-02 | 中国石油化工股份有限公司 | Signal processing method and system for measurement of electromagnetic wave resistivity while drilling |
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| CN101525997B (en) * | 2008-03-06 | 2012-10-17 | 中国石油化工股份有限公司 | Downhole signal transmitting device for electromagnetic measurement while drilling system and transmitting method thereof |
| US20100283468A1 (en) * | 2008-06-27 | 2010-11-11 | John Signorelli | Remotely located tuning circuits for multi-frequency, multi-puropse induction antennae in downhole tools |
| US8829907B2 (en) * | 2009-09-18 | 2014-09-09 | Baker Hughes Incorporated | Frequency filtering and adjustment of electromagnetically received signals from antennas |
| CN102704921B (en) * | 2012-05-28 | 2014-11-26 | 中国石油天然气集团公司 | Measuring device for electrical resistivity of electromagnetic waves while drilling and measuring method thereof |
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