CN103696766A - Specific resistance measurement while drilling device and measurement method thereof - Google Patents
Specific resistance measurement while drilling device and measurement method thereof Download PDFInfo
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- CN103696766A CN103696766A CN201310698427.9A CN201310698427A CN103696766A CN 103696766 A CN103696766 A CN 103696766A CN 201310698427 A CN201310698427 A CN 201310698427A CN 103696766 A CN103696766 A CN 103696766A
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Abstract
The invention discloses a specific resistance measurement while drilling device and a measurement method thereof. Before the specific resistance measurement while drilling device performs measurement, frequency can be tuned automatically, circuits are arranged reasonably and parameters of elements can be regulated to ensure good sensitivity, and the specific resistance measurement while drilling device works under the optimum resonance frequency. Even though temperature or other environmental parameters changes or change, regulation can be performed timely to adapt to changes of the ambient environmental parameters, the problem of low measurement precision caused by the fact that the optimum resonance frequency of the traditional specific resistance measurement while drilling device does not conform to the preset resonance frequency when the traditional specific resistance measurement while drilling device works is effectively avoided, and accuracy of measurement data of the specific resistance measurement while drilling device is greatly improved.
Description
Technical field
The present invention relates to oil, Natural Gas Drilling Operation measurement while drilling field, specifically a kind of measurement mechanism of resistivity logging while drilling and measuring method thereof.
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 transmitter 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 transmitter 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 resonant frequencies 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 resonant frequency of antenna and tuning circuit likely changes with temperature and other ambient 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 ambient parameters change, the optimum resonant frequency of LWD resistivity log device and pre-set resonant frequency are not inconsistent, cause measurement accurate not, thereby propose a kind of measurement mechanism and the measuring method thereof that can automatically carry out the resistivity logging while drilling of frequency tuning before LWD resistivity log device is tested.
For solving the problems of the technologies described above, the present invention adopts following technical scheme to realize.
A kind of measurement mechanism of resistivity logging while drilling, comprise: frequency modulation module, measurement module, transmitting antenna and reception antenna, described frequency modulation module is connected with described reception antenna with described transmitting antenna, regulate the frequency of described transmitting antenna and described reception antenna, described measurement module is measured resistivity logging while drilling, and sending survey data to described transmitting antenna, by described survey data, the form by electromagnetic wave signal sends to described reception antenna to described transmitting antenna.
Described frequency modulation module comprises further:
Receiver module, with described reception antenna coupling, 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 resonant 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 resonant 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 resonant 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 measurement mechanism of whole resistivity logging while drilling according to certain active mode.
A measuring method for LWD resistivity log, comprises the steps:
S1: the frequency that regulates transmitting antenna and reception antenna;
S2: measure resistivity logging while drilling, and send survey data to described transmitting antenna;
S3: the form by electromagnetic wave signal sends to reception antenna to described transmitting antenna by described survey data.
Described step S1 specifically comprises further:
S11: convert described electromagnetic wave signal to the signal of telecommunication;
S12: range detector detects the amplitude information of the described signal of telecommunication obtaining and sends to controller;
S13: described controller calculates amplitude ratio and/or phase difference according to described amplitude information, determines optimum resonant frequency, and controls transmitter module and carry out frequency adjustment;
S14: described transmitter module is controlled transmitting antenna according to optimum resonant frequency electromagnetic signals.
Described step S14 specifically comprises further:
S141: 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;
S142: power amplifier amplifies described first frequency signal and passes to transmitting tuning circuit;
S143: described transmitting tuning circuit is controlled described transmitting antenna according to optimum resonant frequency electromagnetic signals.
Described step S11 specifically comprises further:
S111: 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;
S112: described frequency mixer is given intermediate-frequency filter by described second signal of telecommunication and described second frequency signal hybrid concurrency;
S113: described intermediate-frequency filter filters high fdrequency component, and send to intermediate frequency amplifier;
S114: 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 measurement mechanism of whole resistivity logging while drilling.
Described active mode comprises design temperature threshold value further, surpasses described temperature threshold and automatically opens the measurement mechanism of whole resistivity logging while drilling.
Described active mode comprises the setting-up time cycle further, according to the automatic measurement mechanism of opening whole resistivity logging while drilling of described time cycle.
Technique scheme of the present invention has the following advantages compared to existing technology:
(1) measurement mechanism of a kind of resistivity logging while drilling of the present invention and measuring method thereof, 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 resonant frequency.Even when temperature or other ambient 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 resonant frequency and pre-set resonant 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) measurement mechanism of a kind of resistivity logging while drilling of the present invention and measuring method thereof, provide the mode of multiple activation frequency modulation device in conjunction with the own characteristic of LWD resistivity log device.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 device to carry out frequency tuning.When finding optimum resonant frequency, according to optimum resonant frequency, carry out.Can set and select according to different situations, there is great flexibility.
(3) measurement mechanism of a kind of resistivity logging while drilling of the present invention and measuring method thereof, 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 device 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 measurement mechanism of the resistivity logging while drilling described in a kind of embodiment;
Fig. 5 is the structure chart of frequency modulation module of the measurement mechanism of the resistivity logging while drilling described in a kind of embodiment;
Fig. 6 is the double resonance frequency tuning circuit described in a kind of embodiment;
Fig. 7 is the optimum resonant frequency dynamic tuning process schematic diagram described in a kind of embodiment;
Fig. 8 is the measuring method flow chart for LWD resistivity log described in a kind of embodiment;
Fig. 9 is the flow chart of the step S1 in the measuring method shown in Fig. 8.
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 resonant frequency that 501-is previous, the optimum resonant frequency curve that 502-is current.
The specific embodiment
embodiment 1
The measurement mechanism of a kind of resistivity logging while drilling described in the present embodiment, as shown in Figure 4, comprise: frequency modulation module, measurement module, transmitting antenna 706 and reception antenna 710, described frequency modulation module is connected with described reception antenna 710 with described transmitting antenna 706, regulate the frequency of described transmitting antenna 706 and described reception antenna 710, described measurement module 2 is measured resistivity logging while drilling, and sending survey data to described transmitting antenna 706, by described survey data, the form by electromagnetic wave signal sends to described reception antenna 710 to described transmitting antenna 706.
As everyone knows, when the natural resonance frequency of resonance 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 resonance circuit, then makes transmitting antenna according to optimum resonant frequency electromagnetic signals.
As shown in Figure 5, described frequency modulation module 1 comprises:
Receiver module, with described reception antenna coupling, converts described electromagnetic wave signal to the signal of telecommunication; Range detector 713, is connected with described receiver module, for detection of the amplitude information of the described signal of telecommunication obtaining and send to controller 701; Described controller 701 connects described range detector 713, for calculate amplitude ratio and/or phase difference according to described amplitude information, determines optimum resonant frequency, and controls transmitter module and carry out frequency adjustment; Described transmitter module, is connected with described controller 701, for controlling transmitting antenna 706 according to optimum resonant frequency electromagnetic signals.
The measurement mechanism of the resistivity logging while drilling 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 resonant frequency.Even when temperature or other ambient 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 resonant frequency and pre-set resonant frequency in real work not to be inconsistent, cause measurement problem not accurately, greatly improved the accuracy of LWD resistivity log measurement device data.
Measurement mechanism below in conjunction with a kind of resistivity logging while drilling described in the concrete elaboration the present embodiment of accompanying drawing 5.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 resonant 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 6, 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 resonant frequency dynamically.By Fig. 7, can find that previous optimum resonant frequency curve 501 has been offset, after frequency tuning, again find current optimum resonant frequency curve 502, assurance LWD resistivity log device is worked under optimum resonant frequency.
The present embodiment also comprises active module, according to certain active mode, automatically opens the measurement mechanism of whole resistivity logging while drilling.Described active mode comprises design temperature threshold value, surpasses described temperature threshold and automatically opens the measurement mechanism of whole resistivity logging while drilling.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 measurement mechanism of opening whole resistivity logging while drilling 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 domain of the present embodiment.
The measurement mechanism of the resistivity logging while drilling described in the present embodiment, provides the mode of multiple activation frequency modulation device in conjunction with the own characteristic of LWD resistivity log device.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 device to carry out frequency tuning.When finding optimum resonant frequency, according to optimum resonant 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 domain 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 measurement mechanism of the resistivity logging while drilling 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 measuring method for LWD resistivity log described in the present embodiment, as shown in Figure 8, comprises the steps:
S1: the frequency that regulates transmitting antenna and reception antenna;
S2: measure resistivity logging while drilling, and send survey data to described transmitting antenna;
S3: the form by electromagnetic wave signal sends to reception antenna to described transmitting antenna by described survey data.
As everyone knows, when the natural resonance frequency of resonance 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 resonance circuit, then makes transmitting antenna according to optimum resonant frequency electromagnetic signals.
As shown in Figure 9, described step S1 specifically comprises:
S11: convert described electromagnetic wave signal to the signal of telecommunication;
S12: range detector detects the amplitude information of the described signal of telecommunication obtaining and sends to controller;
S13: described controller calculates amplitude ratio and/or phase difference according to described amplitude information, determines optimum resonant frequency, and controls transmitter module and carry out frequency adjustment;
S14: described transmitter module is controlled transmitting antenna according to optimum resonant frequency electromagnetic signals.
The measuring 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 resonant frequency.Even when temperature or other ambient 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 resonant frequency and pre-set resonant 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 measuring method for LWD resistivity log described in the present embodiment.Described step S14 specifically comprises:
S141: 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;
S142: power amplifier amplifies described first frequency signal and passes to transmitting tuning circuit;
S143: described transmitting tuning circuit is controlled described transmitting antenna according to optimum resonant frequency electromagnetic signals.
Described step S11 specifically comprises:
S111: 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;
S112: described frequency mixer is given intermediate-frequency filter by described second signal of telecommunication and described second frequency signal hybrid concurrency;
S113: described intermediate-frequency filter filters high fdrequency component, and send to intermediate frequency amplifier;
S114: 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 resonant frequency dynamically.By Fig. 6, can find that previous optimum resonant frequency curve 501 has been offset, after frequency tuning, again find current optimum resonant frequency curve 502, assurance LWD resistivity log device is worked under optimum resonant frequency.
The present embodiment also comprises activation step, according to certain active mode, automatically opens the measurement mechanism of whole resistivity logging while drilling.Described active mode comprises design temperature threshold value, surpasses described temperature threshold and automatically opens the measurement mechanism of whole resistivity logging while drilling.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 measurement mechanism of opening whole resistivity logging while drilling 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 domain of the present embodiment.
The measuring 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 device.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 device to carry out frequency tuning.When finding optimum resonant frequency, according to optimum resonant 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 domain 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 measuring 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 embodiment.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 embodiments.And the apparent variation of being extended out thus or change are still among the protection domain in the invention.
Claims (14)
1. the measurement mechanism of a resistivity logging while drilling, it is characterized in that, comprise: frequency modulation module, measurement module, transmitting antenna and reception antenna, described frequency modulation module is connected with described reception antenna with described transmitting antenna, regulate the frequency of described transmitting antenna and described reception antenna, described measurement module is measured resistivity logging while drilling, and sends survey data to described transmitting antenna, and by described survey data, the form by electromagnetic wave signal sends to described reception antenna to described transmitting antenna.
2. the measurement mechanism of resistivity logging while drilling according to claim 1, is characterized in that, described frequency modulation module comprises:
Receiver module, with described reception antenna coupling, 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 resonant 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 resonant frequency electromagnetic signals.
3. the measurement mechanism of resistivity logging while drilling according to claim 1 and 2, 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 resonant frequency electromagnetic signals.
4. according to the measurement mechanism of the arbitrary described resistivity logging while drilling of claim 1-3, it 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.
5. according to the measurement mechanism of the arbitrary described resistivity logging while drilling of claim 1-4, it is characterized in that, described transmitting tuning circuit is conventional double resonance frequency tuning circuit.
6. according to the measurement mechanism of the arbitrary described resistivity logging while drilling of claim 1-5, it is characterized in that, also comprise active module, for automatically opening the measurement mechanism of whole resistivity logging while drilling according to certain active mode.
7. for a measuring method for LWD resistivity log, it is characterized in that, comprise the steps:
S1: the frequency that regulates transmitting antenna and reception antenna;
S2: measure resistivity logging while drilling, and send survey data to described transmitting antenna;
S3: the form by electromagnetic wave signal sends to reception antenna to described transmitting antenna by described survey data.
8. the measuring method for LWD resistivity log according to claim 7, is characterized in that, described step S1 specifically comprises:
S11: convert described electromagnetic wave signal to the signal of telecommunication;
S12: range detector detects the amplitude information of the described signal of telecommunication obtaining and sends to controller;
S13: described controller calculates amplitude ratio and/or phase difference according to described amplitude information, determines optimum resonant frequency, and controls transmitter module and carry out frequency adjustment;
S14: described transmitter module is controlled transmitting antenna according to optimum resonant frequency electromagnetic signals.
9. according to the measuring method for LWD resistivity log described in claim 7 or 8, it is characterized in that, described step S14 specifically comprises:
S141: 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;
S142: power amplifier amplifies described first frequency signal and passes to transmitting tuning circuit;
S143: described transmitting tuning circuit is controlled described transmitting antenna according to optimum resonant frequency electromagnetic signals.
10. according to the arbitrary described measuring method for LWD resistivity log of claim 7-9, it is characterized in that, described step S11 specifically comprises:
S111: 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;
S112: described frequency mixer is given intermediate-frequency filter by described second signal of telecommunication and described second frequency signal hybrid concurrency;
S113: described intermediate-frequency filter filters high fdrequency component, and send to intermediate frequency amplifier;
S114: described intermediate frequency amplifier amplifies and obtains the described signal of telecommunication, sends to described range detector.
11. according to the arbitrary described measuring method for LWD resistivity log of claim 7-10, it is characterized in that, described transmitting tuning circuit is conventional double resonance frequency tuning circuit.
12. according to the arbitrary described measuring method for LWD resistivity log of claim 7-11, it is characterized in that, also comprises activation step, according to certain active mode, automatically opens the measurement mechanism of whole resistivity logging while drilling.
13. according to the arbitrary described measuring method for LWD resistivity log of claim 7-12, it is characterized in that, described active mode comprises design temperature threshold value, surpasses described temperature threshold and automatically opens the measurement mechanism of whole resistivity logging while drilling.
14. according to the arbitrary described measuring method for LWD resistivity log of claim 7-12, it is characterized in that, described active mode comprises the setting-up time cycle, according to the automatic measurement mechanism of opening whole resistivity logging while drilling of described time cycle.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105422087A (en) * | 2014-09-15 | 2016-03-23 | 北京环鼎科技有限责任公司 | Multi-frequency electromagnetic wave resistivity measurement system |
| CN111577259A (en) * | 2020-05-25 | 2020-08-25 | 华中科技大学 | Double-resonance near-bit signal short transmission system |
| CN113138425A (en) * | 2020-01-19 | 2021-07-20 | 中国石油化工股份有限公司 | Logging-while-drilling electromagnetic wave data acquisition method and device |
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| CN113138425B (en) * | 2020-01-19 | 2024-02-27 | 中国石油化工股份有限公司 | Logging-while-drilling electromagnetic wave data acquisition method and device |
| CN111577259A (en) * | 2020-05-25 | 2020-08-25 | 华中科技大学 | Double-resonance near-bit signal short transmission system |
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