CN103701434A - Frequency modulating device and method for measuring resistivity while drilling - Google Patents
Frequency modulating device and method for measuring resistivity while drilling Download PDFInfo
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- CN103701434A CN103701434A CN201310697774.XA CN201310697774A CN103701434A CN 103701434 A CN103701434 A CN 103701434A CN 201310697774 A CN201310697774 A CN 201310697774A CN 103701434 A CN103701434 A CN 103701434A
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Abstract
The invention discloses a frequency modulating device and a frequency modulating method for measuring resistivity while drilling. Frequency tuning can be automatically carried out before a device for measuring the resistivity while drilling is used for measuring, parameters of circuits and adjusting devices are reasonably set to guarantee higher sensitivity, and the device for measuring the resistivity while drilling works at the optimal resonant frequency. Even if temperature or other environmental parameters change, the adjustment can be carried out timely to adapt to the change of the ambient environmental parameters, the problem that the measurement is not accurate because the optimal resonant frequency of the traditional device for measuring the resistivity while drilling does not accord with the preset resonant frequency in actual work is effectively solved, and the accuracy of measured data of the device for measuring the resistivity while drilling is greatly improved.
Description
Technical field
The present invention relates to oil, Natural Gas Drilling Operation measurement while drilling field, specifically a kind of frequency modulation device for LWD resistivity log and method.
Background technology
Along with increasing to oil, Natural Gas Demand of the whole world, LWD resistivity log device has had significant progress and development.Be a kind of conventional LWD resistivity log device as shown in Figure 1, it comprises a drilling rod 100 and a drill bit 101, and a pair of for sending electromagnetic signal to around reflector T1 and the T2 on stratum, a pair of receiver R1 and R2 for receiving electromagnetic signals.Measure the electromagnetic signal through receiver R1 and R2, can obtain apart from the formation resistivity of drilling rod certain distance.Receiver R1 and R2 are placed in to different positions, just can realize the detection of different investigation depths, the spacing of receiver R1 and R2 is rationally set, can obtain good vertical resolution.
Because reflector T1 and T2 are generally operational in plural frequency, suppose that operating frequency is f1 and f2, need to by the frequency of itself and R1 and R2 in advance be tuned to suitable Frequency point, to improve signal, send to the signal to noise ratio of system.This tuning process conventionally double resonance frequency tuning circuit by as shown in Figure 2 completes, and described double resonance frequency tuning circuit comprises the aerial coil 201 of logging while drilling apparatus; Tuning coil device L1, capacitor C2 in parallel with it, another tuning capacitor C1 is with described tuning coil device L1 equivalent parallel and be connected described aerial coil 201; Transformer 202 and the emission source 203 that is operated in fixed frequency for impedance matching.Double resonance frequency tuning circuit shown in Fig. 2 can be by two resonance frequencys of tuning generation, as shown in the solid line in Fig. 3.Well-known LWD resistivity log device is usually operated in very wide temperature range, as-40 ℃ to 150 ℃.Therefore, the resonance frequency of antenna and tuning circuit likely changes with temperature and other environmental parameter, and as shown in the dotted line in Fig. 3, due to the variation gain minimizing of temperature, resonance curve significantly moves down.Because the frequency of aerial coil is substantially all good in factory set, when being used, reality can not adjust as the case may be, cause now whole LWD resistivity log device to have lower sensitivity and signal to noise ratio, and then make resistivity measurement inaccurate, particularly in high resistivity stratum.
Summary of the invention
For this reason, technical problem to be solved by this invention is when temperature or other environmental parameters change, the optimum resonance frequency of LWD resistivity log instrument and pre-set resonance frequency are not inconsistent, cause measurement accurate not, thereby propose a kind of frequency modulation device for LWD resistivity log and the method that can automatically carry out frequency tuning before LWD resistivity log instrument is tested.
For solving the problems of the technologies described above, the present invention adopts following technical scheme to realize.
A frequency modulation device for LWD resistivity log, comprising:
Reception antenna, is arranged on the drilling tool sleeve on the axial direction of receiver module, and for receiving electromagnetic wave signal, described receiver module converts described electromagnetic wave signal to the signal of telecommunication;
Range detector, is connected with described receiver module, for detection of the amplitude information of the described signal of telecommunication obtaining and send to controller;
Described controller, connects described range detector, for calculate amplitude ratio and/or phase difference according to described amplitude information, determines optimum resonance frequency, and controls transmitter module and carry out frequency adjustment;
Described transmitter module, is connected with described controller, for controlling transmitting antenna according to optimum resonance frequency electromagnetic signals.
Described transmitter module also comprises further:
First signal generator, is connected with described controller, sends first frequency signal to power amplifier, and 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 to transmitting tuning circuit;
Described transmitting tuning circuit, one end is connected with described power amplifier, and other end coupling firing antenna is controlled described transmitting antenna according to optimum resonance frequency electromagnetic signals.
Described receiver module also comprises further:
Receive tuning circuit, be connected with described reception antenna, for receiving described electromagnetic wave signal, convert the signal of telecommunication to, and send to low noise amplifier;
Described low noise amplifier, is connected with described reception tuning circuit, the described signal of telecommunication is amplified and send to frequency mixer;
Secondary signal generator, is connected with described controller, and 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 secondary signal generator with described low noise amplifier respectively, by the described signal of telecommunication and described second frequency signal hybrid concurrency, gives intermediate-frequency filter;
Described intermediate-frequency filter, is connected with described frequency mixer, filters high fdrequency component, and sends to intermediate frequency amplifier;
Described intermediate frequency amplifier, is connected with described intermediate-frequency filter, amplifies and obtains the described signal of telecommunication, sends to described range detector.
Described transmitting tuning circuit is conventional double resonance frequency tuning circuit further.
Also comprise further active module, for automatically opening the frequency modulation device of whole LWD resistivity log according to certain active mode.
Further the quantity of described transmitting antenna can for one, two or more.
Described controller is microprocessor or digital signal processor further.
A frequency modulation method for LWD resistivity log, comprises the steps:
S1: reception antenna receives electromagnetic wave signal, and receiver module converts described electromagnetic wave signal to the signal of telecommunication;
S2: range detector detects the amplitude information of the described signal of telecommunication obtaining and sends to controller;
S3: described controller calculates amplitude ratio and/or phase difference according to described amplitude information, determines optimum resonance frequency, and controls transmitter module and carry out frequency adjustment;
S4: described transmitter module is controlled transmitting antenna according to optimum resonance frequency electromagnetic signals.
Described step S4 specifically comprises further:
S41: first signal generator sends first frequency signal to power amplifier, and the frequency of wherein said first frequency signal and phase place can be controlled by described controller;
S42: power amplifier amplifies described first frequency signal and passes to transmitting tuning circuit;
S43: described transmitting tuning circuit is controlled described transmitting antenna according to optimum resonance frequency electromagnetic signals.
Described step S1 specifically comprises further:
S11: receive tuning circuit and receive described electromagnetic wave signal, convert the signal of telecommunication to, and send to low noise amplifier;
Described low noise amplifier amplifies the described signal of telecommunication and sends to frequency mixer;
Secondary signal generator sends second frequency signal to described frequency mixer, and the frequency of wherein said second frequency signal and phase place can be controlled by described controller;
S12: described frequency mixer is given intermediate-frequency filter by described second signal of telecommunication and described second frequency signal hybrid concurrency;
S13: described intermediate-frequency filter filters high fdrequency component, and send to intermediate frequency amplifier;
S14: described intermediate frequency amplifier amplifies and obtains the described signal of telecommunication, sends to described range detector.
Described transmitting tuning circuit is conventional double resonance frequency tuning circuit further.
Also comprise further activation step, according to certain active mode, automatically open the frequency modulation device of whole LWD resistivity log.
Described active mode comprises design temperature threshold value further, surpasses described temperature threshold and automatically opens the frequency modulation device of whole LWD resistivity log.
Described active mode comprises the setting-up time cycle further, according to the automatic frequency modulation device of opening whole LWD resistivity log of described time cycle.
Further the quantity of described transmitting antenna can for one, two or more.
Described controller is microprocessor or digital signal processor further.
Technique scheme of the present invention has the following advantages compared to existing technology:
(1) a kind of frequency modulation device for LWD resistivity log of the present invention and method, can before measuring, LWD resistivity log device automatically carry out frequency tuning, the parameter of circuit, adjusting components and parts is rationally set, to guarantee good sensitivity, LWD resistivity log device is worked under optimum resonance frequency.Even when temperature or other environmental parameters change, also can adjust in time, to adapt to the change of surrounding environment parameter, effectively avoided traditional LWD resistivity log device its optimum resonance frequency and pre-set resonance frequency in real work not to be inconsistent, cause measurement problem not accurately, greatly improved 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, provide the mode of multiple activation frequency modulation device in conjunction with the own characteristic of LWD resistivity log instrument.Be preferably set temperature threshold value and set two kinds of activation cycles, when variations in temperature reaches given threshold value or when reaching given cycle of one of frequency optimization, automatically start LWD resistivity log instrument to carry out frequency tuning.When finding optimum resonance frequency, according to optimum resonance frequency, carry out.Can set and select according to different situations, there is great flexibility.
(3) a kind of frequency modulation device for LWD resistivity log of the present invention and method, integrated circuit is simple in structure, and selected components and parts are in prior art conventional use, are easy to realize, and can meet the demand of industry to use cost.
Accompanying drawing explanation
For content of the present invention is more likely to be clearly understood, below according to a particular embodiment of the invention and by reference to the accompanying drawings, 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 double resonance frequency 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 double resonance frequency tuning circuit described in a kind of embodiment;
Fig. 6 is the optimum resonance frequency dynamic tuning process schematic diagram 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 numeral is expressed as: 100-drill string, 101-drill bit, 201-aerial coil, 202-transformer, the emission source of 203-fixed frequency, 701-controller, 702-first signal generator, 703-secondary signal generator, 704-power amplifier, 705-launches tuning circuit, 706-transmitting antenna, 707-frequency mixer, 708-low noise amplifier, 709-receives tuning circuit, 710-reception antenna, 711-intermediate-frequency filter, 712-intermediate frequency amplifier, 713-range detector, the optimum resonance frequency that 501-is previous, the optimum resonance frequency curve that 502-is current.
Embodiment
embodiment 1
A kind of frequency modulation device for LWD resistivity log described in the present embodiment, as shown in Figure 4, comprising:
As everyone knows, when the natural resonance frequency of resonant circuit is identical with the frequency of signal source, circuit amplitude also will reach peak value, and the oscillating current producing in circuit is the strongest.The present embodiment utilizes this principle just, by the frequency of controller control break resonant circuit, then makes transmitting antenna according to optimum resonance frequency electromagnetic signals.
The frequency modulation device for LWD resistivity log described in the present embodiment, can before measuring, LWD resistivity log device automatically carry out frequency tuning, the parameter of circuit, adjusting components and parts is rationally set, to guarantee good sensitivity, LWD resistivity log device is worked under optimum resonance frequency.Even when temperature or other environmental parameters change, also can adjust in time, to adapt to the change of surrounding environment parameter, effectively avoided traditional LWD resistivity log device its optimum resonance frequency and pre-set resonance frequency in real work not to be inconsistent, cause measurement problem not accurately, greatly improved the accuracy of LWD resistivity log measurement device data.
Below in conjunction with a kind of frequency modulation device for LWD resistivity log described in the concrete elaboration the present embodiment of accompanying drawing 4.Described transmitter module also comprises: first signal generator 702, be connected with described controller 701, and send first frequency signal to power amplifier 704, the frequency of wherein said first frequency signal and phase place can be controlled by described controller 701; Described power amplifier 704, is connected with described first signal generator 702, amplifies described first frequency signal and passes to transmitting tuning circuit 705; Described transmitting tuning circuit 705, one end is connected with described power amplifier 704, and other end coupling firing antenna 706 is controlled described transmitting antenna 706 according to optimum resonance frequency electromagnetic signals.
Described receiver module also comprises: receive tuning circuit 709, be connected with described reception antenna 710, for receiving described electromagnetic wave signal, convert the signal of telecommunication to, and send to low noise amplifier 708; Described low noise amplifier 708, is connected with described reception tuning circuit 709, the described signal of telecommunication is amplified and send to frequency mixer 707; Secondary signal generator 703, is connected with described controller 701, and for sending second frequency signal to described frequency mixer 707, the frequency of wherein said second frequency signal and phase place can be controlled by described controller 701; Described frequency mixer 707, is connected with described secondary signal generator 703 with described low noise amplifier 708 respectively, the described signal of telecommunication is mixed with described second frequency signal, and send to intermediate-frequency filter; Described intermediate-frequency filter 711, is connected with described frequency mixer 707, filters high fdrequency component, and sends to intermediate frequency amplifier 712; Described intermediate frequency amplifier 712, is connected with described intermediate-frequency filter 711, amplifies the described signal of telecommunication, sends to described range detector 713.
The setting value of the frequency values of wherein said first frequency signal and described second frequency signal, the numerical value that is those skilled in the art's routine is selected, and only needs the bandwidth of assurance reception tuning circuit enough, is not repeating herein.
Described transmitting tuning circuit is conventional double resonance frequency tuning circuit.As shown in Figure 5, comprising: transformer 402, be connected with described power amplifier, for producing mutual inductance effect with described power amplifier, produce optimum resonant frequency signal; Tuning coil device L1, connects with described transformer; Capacitor C2, in parallel with described tuning coil device L1; Tuning capacitor C1, one end is connected with described tuning coil device L1, one end and the coupling of described transmitting antenna.It is that with the difference of Fig. 2 the signal frequency that described power amplifier sends is variable, therefore can obtain optimum resonance frequency dynamically.By Fig. 6, can find that previous optimum resonance frequency curve 501 has been offset, after frequency tuning, again find current optimum resonance frequency curve 502, assurance LWD resistivity log instrument is worked under optimum resonance frequency.
The present embodiment also comprises active module, according to certain active mode, automatically opens the frequency modulation device of whole LWD resistivity log.Described active mode comprises design temperature threshold value, surpasses described temperature threshold and automatically opens the frequency modulation device of whole LWD resistivity log.Preferably by described active module built-in temperature sensor, realize.Described active mode can also comprise the setting-up time cycle simultaneously, according to the automatic frequency modulation device of opening whole LWD resistivity log of described time cycle.Certainly also have some other active mode, do not repeating herein.Those skilled in the art should know, and above-mentioned active mode is intended in order to absolutely prove the present embodiment, are not in order to limit the present embodiment, and other apparent active modes are also within the protection range of the present embodiment.
The frequency modulation device for LWD resistivity log described in the present embodiment, provides the mode of multiple activation frequency modulation device in conjunction with the own characteristic of LWD resistivity log instrument.Be preferably two kinds of set temperature threshold value and setting-up time cycles, when variations in temperature reaches given threshold value or when reaching given cycle of one of frequency optimization, automatically start LWD resistivity log instrument to carry out frequency tuning.When finding optimum resonance frequency, according to optimum resonance frequency, carry out.Can set and select according to different situations, there is great flexibility.
The quantity of described transmitting antenna can for one, two or more.The present embodiment is preferably two.Those skilled in the art should know, and it is in order to absolutely prove the present embodiment that quantity is herein set, and is not used for limiting the present embodiment, and other apparent number change are all within the protection range of the present embodiment.
Described controller is microprocessor or digital signal processor.Other such as range detector, first signal generator, power amplifier, low noise amplifier, secondary signal generator, frequency mixer, intermediate-frequency filter, intermediate frequency amplifier etc. all can be selected conventional components and parts, those skilled in the art should know, so locate do not repeating.
The frequency modulation device for LWD resistivity log described in the present embodiment, integrated circuit is simple in structure, and selected components and parts are in prior art conventional use, are easy to realize, and can meet the demand of industry to use cost.
embodiment 2
A kind of frequency modulation method for LWD resistivity log described in the present embodiment, as shown in Figure 7, comprises the steps:
S1: reception antenna receives electromagnetic wave signal, and receiver module converts described electromagnetic wave signal to the signal of telecommunication;
S2: range detector detects the amplitude information of the described signal of telecommunication obtaining and sends to controller;
S3: described controller calculates amplitude ratio and/or phase difference according to described amplitude information, determines optimum resonance frequency, and controls transmitter module and carry out frequency adjustment;
S4: described transmitter module is controlled transmitting antenna according to optimum resonance frequency electromagnetic signals.
As everyone knows, when the natural resonance frequency of resonant circuit is identical with the frequency of signal source, circuit amplitude also will reach peak value, and the oscillating current producing in circuit is the strongest.The present embodiment utilizes this principle just, by the frequency of controller control break resonant circuit, then makes transmitting antenna according to optimum resonance frequency electromagnetic signals.
The frequency modulation method for LWD resistivity log described in the present embodiment, can before measuring, LWD resistivity log device automatically carry out frequency tuning, the parameter of circuit, adjusting components and parts is rationally set, to guarantee good sensitivity, LWD resistivity log device is worked under optimum resonance frequency.Even when temperature or other environmental parameters change, also can adjust in time, to adapt to the change of surrounding environment parameter, effectively avoided traditional LWD resistivity log device its optimum resonance frequency and pre-set resonance frequency in real work not to be inconsistent, cause measurement problem not accurately, greatly improved the accuracy of LWD resistivity log measurement device data.
Lower mask body is set forth a kind of frequency modulation method for LWD resistivity log described in the present embodiment.Described step S4 specifically comprises:
S41: first signal generator sends first frequency signal to power amplifier, and the frequency of wherein said first frequency signal and phase place can be controlled by described controller;
S42: power amplifier amplifies described first frequency signal and passes to transmitting tuning circuit;
S43: described transmitting tuning circuit is controlled described transmitting antenna according to optimum resonance frequency electromagnetic signals.
Described step S1 specifically comprises:
S11: receive tuning circuit and receive described electromagnetic wave signal, convert the signal of telecommunication to, and send to low noise amplifier;
Described low noise amplifier amplifies the described signal of telecommunication and sends to frequency mixer;
Secondary signal generator sends second frequency signal to described frequency mixer, and the frequency of wherein said second frequency signal and phase place can be controlled by described controller;
S12: described frequency mixer is given intermediate-frequency filter by described second signal of telecommunication and described second frequency signal hybrid concurrency;
S13: described intermediate-frequency filter filters high fdrequency component, and send to intermediate frequency amplifier;
S14: described intermediate frequency amplifier amplifies and obtains the described signal of telecommunication, sends to described range detector.
The setting value of the frequency values of wherein said first frequency signal and described second frequency signal, the numerical value that is those skilled in the art's routine is selected, and only needs the bandwidth of assurance reception tuning circuit enough, is not repeating herein.
Described transmitting tuning circuit is conventional double resonance frequency tuning circuit.As shown in Figure 5, comprising: transformer 402, be connected with described power amplifier, for producing mutual inductance effect with described power amplifier, produce optimum resonant frequency signal; Tuning coil device L1, connects with described transformer; Capacitor C2, in parallel with described tuning coil device L1; Tuning capacitor C1, one end is connected with described tuning coil device L1, one end and the coupling of described transmitting antenna.It is that with the difference of Fig. 2 the signal frequency that described power amplifier sends is variable, therefore can obtain optimum resonance frequency dynamically.By Fig. 6, can find that previous optimum resonance frequency curve 501 has been offset, after frequency tuning, again find current optimum resonance frequency curve 502, assurance LWD resistivity log instrument is worked under optimum resonance frequency.
The present embodiment also comprises activation step, according to certain active mode, automatically opens the frequency modulation device of whole LWD resistivity log.Described active mode comprises design temperature threshold value, surpasses described temperature threshold and automatically opens the frequency modulation device of whole LWD resistivity log.Preferably by described active module built-in temperature sensor, realize.Described active mode can also comprise the setting-up time cycle simultaneously, according to the automatic frequency modulation device of opening whole LWD resistivity log of described time cycle.Certainly also have some other active mode, do not repeating herein.Those skilled in the art should know, and above-mentioned active mode is intended in order to absolutely prove the present embodiment, are not in order to limit the present embodiment, and other apparent active modes are also within the protection range of the present embodiment.
The frequency modulation method for LWD resistivity log described in the present embodiment, provides the mode of multiple activation frequency modulation device in conjunction with the own characteristic of LWD resistivity log instrument.Be preferably set temperature threshold value and set two kinds of activation cycles, when variations in temperature reaches given threshold value or when reaching given cycle of one of frequency optimization, automatically start LWD resistivity log instrument to carry out frequency tuning.When finding optimum resonance frequency, according to optimum resonance frequency, carry out.Can set and select according to different situations, there is great flexibility.
The quantity of described transmitting antenna can for one, two or more.The present embodiment is preferably two.Those skilled in the art should know, and it is in order to absolutely prove the present embodiment that quantity is herein set, and is not used for limiting the present embodiment, and other apparent number change are all within the protection range of the present embodiment.
Described controller is microprocessor or digital signal processor.Other such as range detector, first signal generator, power amplifier, low noise amplifier, secondary signal generator, frequency mixer, intermediate-frequency filter, intermediate frequency amplifier etc. all can be selected conventional components and parts, those skilled in the art should know, so locate do not repeating.
The frequency modulation method for LWD resistivity log described in the present embodiment, integrated circuit is simple in structure, and selected components and parts are in prior art conventional use, are easy to realize, and can meet the demand of industry to use cost.
Obviously, above-described embodiment is only for example is clearly described, and the not restriction to execution mode.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all execution modes.And the apparent variation of being extended out thus or change are still among the protection range in the invention.
Claims (16)
1. for a frequency modulation device for LWD resistivity log, it is characterized in that, comprising:
Reception antenna, is arranged on the drilling tool sleeve on the axial direction of receiver module, and for receiving electromagnetic wave signal, described receiver module converts described electromagnetic wave signal to the signal of telecommunication;
Range detector, is connected with described receiver module, for detection of the amplitude information of the described signal of telecommunication obtaining and send to controller;
Described controller, connects described range detector, for calculate amplitude ratio and/or phase difference according to described amplitude information, determines optimum resonance frequency, and controls transmitter module and carry out frequency adjustment;
Described transmitter module, is connected with described controller, for controlling transmitting antenna according to optimum resonance frequency electromagnetic signals.
2. the frequency modulation device for LWD resistivity log according to claim 1, is characterized in that, described transmitter module also comprises:
First signal generator, is connected with described controller, sends first frequency signal to power amplifier, and 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 to transmitting tuning circuit;
Described transmitting tuning circuit, one end is connected with described power amplifier, and other end coupling firing antenna is controlled described transmitting antenna according to optimum resonance frequency electromagnetic signals.
3. the frequency modulation device for LWD resistivity log according to claim 1 and 2, is characterized in that, described receiver module also comprises:
Receive tuning circuit, be connected with described reception antenna, for receiving described electromagnetic wave signal, convert the signal of telecommunication to, and send to low noise amplifier;
Described low noise amplifier, is connected with described reception tuning circuit, the described signal of telecommunication is amplified and send to frequency mixer;
Secondary signal generator, is connected with described controller, and 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 secondary signal generator with described low noise amplifier respectively, by the described signal of telecommunication and described second frequency signal hybrid concurrency, gives intermediate-frequency filter;
Described intermediate-frequency filter, is connected with described frequency mixer, filters high fdrequency component, and sends to intermediate frequency amplifier;
Described intermediate frequency amplifier, is connected with described intermediate-frequency filter, amplifies and obtains the described signal of telecommunication, sends to described range detector.
4. according to the arbitrary described frequency modulation device for LWD resistivity log of claim 1-3, it is characterized in that, described transmitting tuning circuit is conventional double resonance frequency tuning circuit.
5. according to the arbitrary described frequency modulation device for LWD resistivity log of claim 1-4, it is characterized in that, also comprise active module, for automatically opening the frequency modulation device of whole LWD resistivity log according to certain active mode.
6. according to the arbitrary described frequency modulation device for LWD resistivity log of claim 1-5, it is characterized in that, the quantity of described transmitting antenna can for one, two or more.
7. according to the arbitrary described frequency modulation device for LWD resistivity log of claim 1-6, it is characterized in that, described controller is microprocessor or digital signal processor.
8. for a frequency modulation method for LWD resistivity log, it is characterized in that, comprise the steps:
S1: reception antenna receives electromagnetic wave signal, and receiver module converts described electromagnetic wave signal to the signal of telecommunication;
S2: range detector detects the amplitude information of the described signal of telecommunication obtaining and sends to controller;
S3: described controller calculates amplitude ratio and/or phase difference according to described amplitude information, determines optimum resonance frequency, and controls transmitter module and carry out frequency adjustment;
S4: described transmitter module is controlled transmitting antenna according to optimum resonance frequency electromagnetic signals.
9. the frequency modulation method for LWD resistivity log according to claim 8, is characterized in that, described step S4 specifically comprises:
S41: first signal generator sends first frequency signal to power amplifier, and the frequency of wherein said first frequency signal and phase place can be controlled by described controller;
S42: power amplifier amplifies described first frequency signal and passes to transmitting tuning circuit;
S43: described transmitting tuning circuit is controlled described transmitting antenna according to optimum resonance frequency electromagnetic signals.
10. the frequency modulation method for LWD resistivity log according to claim 8 or claim 9, is characterized in that, described step S1 specifically comprises:
S11: receive tuning circuit and receive described electromagnetic wave signal, convert the signal of telecommunication to, and send to low noise amplifier;
Described low noise amplifier amplifies the described signal of telecommunication and sends to frequency mixer;
Secondary signal generator sends second frequency signal to described frequency mixer, and the frequency of wherein said second frequency signal and phase place can be controlled by described controller;
S12: described frequency mixer is given intermediate-frequency filter by described second signal of telecommunication and described second frequency signal hybrid concurrency;
S13: described intermediate-frequency filter filters high fdrequency component, and send to intermediate frequency amplifier;
S14: described intermediate frequency amplifier amplifies and obtains the described signal of telecommunication, sends to described range detector.
11. according to Claim 8-10 arbitrary described frequency modulation methods for LWD resistivity log, is characterized in that, described transmitting tuning circuit is conventional double resonance frequency tuning circuit.
12. according to Claim 8-11 arbitrary described frequency modulation methods for LWD resistivity log, is characterized in that, also comprise activation step, according to certain active mode, automatically open the frequency modulation device of whole LWD resistivity log.
13. according to Claim 8-12 arbitrary described frequency modulation methods for LWD resistivity log, is characterized in that, described active mode comprises design temperature threshold value, surpass described temperature threshold and automatically open the frequency modulation device of whole LWD resistivity log.
14. according to Claim 8-12 arbitrary described frequency modulation methods for LWD resistivity log, is characterized in that, described active mode comprises the setting-up time cycle, according to the automatic frequency modulation device of opening whole LWD resistivity log of described time cycle.
15. according to Claim 8-14 arbitrary described frequency modulation methods for LWD resistivity log, is characterized in that, the quantity of described transmitting antenna can for one, two or more.
16. according to Claim 8-15 arbitrary described frequency modulation methods for LWD resistivity log, is characterized in that, described controller is microprocessor or digital signal processor.
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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 |
| CN107152276A (en) * | 2016-03-02 | 2017-09-12 | 中国石油化工股份有限公司 | For with the signal processing method and system for boring electromagnetic resistivity measurement |
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