CN202991019U - Acoustic logging transmitting transducer driving system - Google Patents
Acoustic logging transmitting transducer driving system Download PDFInfo
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- CN202991019U CN202991019U CN 201220528607 CN201220528607U CN202991019U CN 202991019 U CN202991019 U CN 202991019U CN 201220528607 CN201220528607 CN 201220528607 CN 201220528607 U CN201220528607 U CN 201220528607U CN 202991019 U CN202991019 U CN 202991019U
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- transmitting transducer
- ground
- mos pipe
- signal
- acoustic logging
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Abstract
The utility model relates to an acoustic logging transmitting transducer driving system. The acoustic logging transmitting transducer driving system comprises a ground waveform design module, a waveform generation module, a power amplifier module, a transmitting transducer and the like. Waveform data or control instructions with different frequency bands are chosen or designed according to needs of users through a ground meter. The waveform data or control instructions with the different frequency bands are sent to a downhole control unit of an acoustic wave downhole instrument through telemetry short pieces. The downhole control unit controls a digital-to-analog (D/A) converter to generate low voltage simulation waveforms, and after signal conditioning is conducted on the low voltage simulation waveforms, signal waveforms are outputted. A power amplification electric circuit is used for conducting power amplification to the signal waveforms, and the signal waveforms are applied to the transmitting transducer to radiate sound waves outwards. The acoustic logging transmitting transducer driving system has the advantages that impulse waveforms of a transmission circuit can be designed in the ground, according to geological conditions and the fact that logging requires of selecting more favorable excitation waveforms, better logging data are obtained, and stratum applicability of an acoustic logging instrument is improved.
Description
Technical field
The utility model relates to the technical field of acoustic logging, is specifically related to a kind of acoustic logging transmitting transducer drive system.
Background technology
Acoustic logging is one of main method of geophysical log, all has a wide range of applications in the exploration and development stage of oil gas field.Theory and experimental study show, the sound source frequency bandwidth characteristics has a great impact logging effect, should adopt suitable sound source frequency band for different well logging purposes and geological conditions.For example: usually need higher frequency of source for outstanding ripple in length and breadth for the monopole acoustic logging; If wanting to obtain preferably, Stoneley wave needs to be operated in low frequency mode; For the well logging of cased well cementing quality, the sound source dominant frequency is located at the 20kHz left and right usually; For dipole shear wave logging, wish frequency of source in DIPOLE FLEXURAL WAVES near frequency (bending wave is relevant with stratum and borehole size by frequency).In addition, Different Strata has than big difference the attenuation of sound wave, therefore sound power of a source is also had different requirement.The acoustic logging instrument transmitting transducer adopts the high-voltage rectangular pulse of certain width to encourage usually at present, and the user can't carry out the control of frequency of source according to engineering or scientific research needs.
The utility model content
The purpose of this utility model has been to provide a kind of new acoustic logging transmitting transducer drive system.The user can configure required sound source parameter as required flexibly, improves the quality of acoustic logging data, makes acoustic logging better for producing and Scientific Research Service.
Technical scheme: a kind of acoustic logging transmitting transducer drive system, contain waveform generation module, power amplifier module and transmitting transducer, also include the ground instrument, ground waveform design module is set in the instrument of ground, described ground waveform design module carries out the information transmission by remote measurement pipe nipple and down-hole control module, the down-hole control module is connected with the D/A modular converter, D/A modular converter analog output connects the signal condition module, signal condition module output is connected with the linear power amplification circuit input, and the linear power amplification circuit output is connected with transmitting transducer.
Described power amplification circuit comprises the signal coupling transformer T1 of input and step-up transformer T2, power MOS pipe Q1, the Q2 of output, and the two ends of the secondary windings of signal coupling transformer T1 are respectively signal Sig1 and Sig2; Be connected with the grid of power MOS pipe Q1 after signal Sig1 process resistance R 1, R3 dividing potential drop, be connected with the grid of power MOS pipe Q2 after signal Sig2 process resistance R 2, R4 dividing potential drop, the source electrode of power MOS pipe Q1, Q2 all is connected to the ground; By being connected to the ground after Zener diode D1, D2, the grid of power MOS pipe Q2 is successively by being connected to the ground after Zener diode D3, D4 successively for the grid of power MOS pipe Q1; The drain electrode of power MOS pipe Q1, Q2 is connected with the armature winding two ends of described step-up transformer T2 respectively, and this armature winding has a centre cap, and this centre cap is connected with high-voltage DC power supply HV; The secondary windings two ends of step-up transformer T2 are connected with transmitting transducer two ends; The source electrode of power MOS pipe Q1, Q2 is connected with high-voltage DC power supply HV with R6 by resistance R 5 respectively.
The secondary windings of signal coupling transformer T1 has a centre cap, and this centre cap is connected with forward bias voltage Vbis.
The down-hole waveform generation module: down-hole control module (as MCU, DSP, FPGA, CPLD etc.) is according to the Wave data that receives ground; Or the Wave data stored of down-hole control module, to down-hole control module sending controling instruction, make down-hole control module oneself produce Wave data by the ground instrument; Above-mentioned Wave data is changed by D/A produced the low-voltage simulation waveform, and undertaken exporting low-voltage simulation waveform Signal waveform after signal condition by filter circuit, amplifying circuit;
Power amplifier module: adopt linear power amplification circuit (as transformer coupled class AB push-pull power amplification circuit) that low-voltage simulation waveform Signal waveform is carried out power amplification (the Voltage Peak peak value of output should reach several hectovolts and even thousands of volt usually), HT waveform after amplification is applied on transmitting transducer, thus outside radiative acoustic wave.
Described power amplification circuit comprises signal coupling transformer T1, step-up transformer T2, power MOS pipe Q1, Q2 etc., the Signal signal becomes opposite polarity two paths of signals Sig1 and Sig2 through signal coupling transformer T1, the secondary windings of signal coupling transformer T1 has a centre cap, this centre cap is connected with bias voltage Vbis, to avoid intermodulation distortion (also can adopt homophase amplification, anti-phase amplification and the summing circuit that operational amplifier consists of to realize); Be added in the grid of power MOS pipe Q1 after signal Sig1 process resistance R 1, R3 dividing potential drop, be added in the grid of power MOS pipe Q2 after signal Sig2 process resistance R 2, R4 dividing potential drop, the source electrode of power MOS pipe Q1, Q2 all is connected to the ground; By being connected to the ground after Zener diode D1, D2, the grid of power MOS pipe Q2 by being connected to the ground after Zener diode D3, D4, plays a protective role to power MOS pipe Q1 and Q2 the grid of power MOS pipe Q1 successively successively; The drain electrode of power MOS pipe Q1, Q2 is connected with the armature winding two ends of described step-up transformer T2 respectively, and this armature winding has a centre cap, and this centre cap is connected with high-voltage DC power supply HV, for power discharge circuit provides energy; The secondary windings two ends of step-up transformer T2 are connected with transmitting transducer M two ends; The source electrode of power MOS pipe Q1, Q2 is connected with high-voltage DC power supply HV with R6 by resistance R 5 respectively; The positive-negative half-cycle conducting in turn at the Signal signal of power MOS pipe Q1, Q2 is boosted by step-up transformer T2 and rear transmitting transducer M is encouraged.Can increase negative-feedback in order to improve power amplification circuit output linearity degree and job stability.
The driving method of this transmitting transducer is applicable to the excitation of the various acoustic logging instrument transmitting transducers such as one pole, dipole, four utmost points, and the piezoelectric transducer of various shapes and structure, electromagnetic transduction etc. are all had compliance.
Beneficial effect: the utility model has the advantage of and the impulse waveform in the face of radiating circuit to design on ground, select more favourable excitation waveform according to geological condition and well logging needs, obtain better well-log information.Improved the stratum applicability of acoustic logging instrument.The utility model is applied to dipole array acoustilog instrument, effectively reduces the frequency of sound source.
Description of drawings
Fig. 1 is system block diagram of the present utility model;
Fig. 2 is a kind of broadband emission waveform and the frequency spectrum that adopts the utility model system to produce;
Fig. 3 is a kind of narrow emission waveform and the frequency spectrum that adopts the utility model system to produce;
Fig. 4 is a kind of frequency sweep transmitted waveform and the frequency spectrum that adopts the utility model system to produce;
Fig. 5 is the circuit diagram of power amplification circuit of the present utility model.
The specific embodiment
Embodiment 1: acoustic logging transmitting transducer drive system as shown in Figure 1 mainly is comprised of ground waveform design module, waveform generation module, power amplifier module and transmitting transducer etc.Be used for the driving of acoustic logging instrument transmitting transducer, purpose is by controlling the stimulated emission transducer to the stratum radiative acoustic wave, in particular, is for the control to acoustic logging instrument sound source characteristic (frequency band, amplitude etc.).Wherein the driving method of transmitting transducer is applicable to the excitation of the various acoustic logging instrument transmitting transducers such as one pole, dipole, four utmost points, to the piezoelectric transducer of various shapes and structure, electromagnetic transduction (etc.) all have compliance.
In Fig. 1, functions is described below:
Ground waveform design module: the user selects as required with the ground instrument or designs the Wave data (or control instruction) with different frequency bands, is handed down to the sound wave downhole cartridge by the remote measurement pipe nipple.For convenience of explanation, Fig. 2～Fig. 4 has provided time domain waveform and the frequency spectrum (being not limited to this several waveforms) of several pulses.
The down-hole waveform generation module: down-hole control module (as MCU, DSP, FPGA, CPLD etc.) (can be also the Wave data that has stored the down-hole according to the Wave data or the instruction that receive ground, or ground sends instruction down-hole control module oneself generation Wave data to the down-hole) change generation low-voltage simulation waveform by D/A, and carry out signal condition by filter circuit, amplifying circuit etc. and finally export low-voltage simulation waveform Signal waveform.
Power amplifier module: adopt power amplification circuit (as transformer coupled class AB push-pull power amplification circuit) that low-voltage simulation waveform Signal is carried out power amplification (the Voltage Peak peak value of output should reach several hectovolts and even thousands of volt usually), HT waveform after amplification is applied on transmitting transducer, thus outside radiative acoustic wave.Power amplification circuit is seen Fig. 5.
In Fig. 5, the Signal signal forms opposite polarity two paths of signals Sig1 and Sig2 through signal coupling transformer T1, Vbis is bias voltage, to avoid intermodulation distortion (also can adopt homophase amplification, anti-phase amplification and the summing circuit that operational amplifier consists of to realize); Signal Sig1(Sig2) through resistance R 1, R3(R2, R4) be added in power MOS pipe Q1(Q2 after dividing potential drop) grid, the source electrode of power MOS pipe Q1, Q2 all is connected to the ground, D1, D2(D3, D4) be Zener diode, to power MOS pipe Q1(Q2) play a protective role; HV is high-voltage DC power supply, for power discharge circuit provides energy; Power MOS pipe Q1, Q2 be in the positive-negative half-cycle conducting in turn of Signal signal, boosts by step-up transformer T2 and rear transducer M is encouraged.Can increase negative-feedback in order to improve power amplification circuit output linearity degree and job stability.The main annexation of each components and parts is all indicated in the drawings.
Claims (3)
1. acoustic logging transmitting transducer drive system, contain waveform generation module, power amplifier module and transmitting transducer, it is characterized in that, also include the ground instrument, ground waveform design module is set in the instrument of ground, described ground waveform design module carries out the information transmission by remote measurement pipe nipple and down-hole control module, the down-hole control module is connected with the D/A modular converter, D/A modular converter analog output connects the signal condition module, signal condition module output is connected with the linear power amplification circuit input, the linear power amplification circuit output is connected with transmitting transducer.
2. acoustic logging transmitting transducer drive system according to claim 1, it is characterized in that, described power amplification circuit comprises the signal coupling transformer T1 of input and step-up transformer T2, power MOS pipe Q1, the Q2 of output, and the two ends of the secondary windings of signal coupling transformer T1 are respectively signal Sig1 and Sig2; Be connected with the grid of power MOS pipe Q1 after signal Sig1 process resistance R 1, R3 dividing potential drop, be connected with the grid of power MOS pipe Q2 after signal Sig2 process resistance R 2, R4 dividing potential drop, the source electrode of power MOS pipe Q1, Q2 all is connected to the ground; By being connected to the ground after Zener diode D1, D2, the grid of power MOS pipe Q2 is successively by being connected to the ground after Zener diode D3, D4 successively for the grid of power MOS pipe Q1; The drain electrode of power MOS pipe Q1, Q2 is connected with the armature winding two ends of described step-up transformer T2 respectively, and this armature winding has a centre cap, and this centre cap is connected with high-voltage DC power supply HV; The secondary windings two ends of step-up transformer T2 are connected with transmitting transducer two ends; The source electrode of power MOS pipe Q1, Q2 is connected with high-voltage DC power supply HV with R6 by resistance R 5 respectively.
3. acoustic logging transmitting transducer drive system according to claim 2, is characterized in that, the secondary windings of signal coupling transformer T1 has a centre cap, and this centre cap is connected with forward bias voltage Vbis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220528607 CN202991019U (en) | 2012-10-16 | 2012-10-16 | Acoustic logging transmitting transducer driving system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220528607 CN202991019U (en) | 2012-10-16 | 2012-10-16 | Acoustic logging transmitting transducer driving system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202991019U true CN202991019U (en) | 2013-06-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220528607 Expired - Fee Related CN202991019U (en) | 2012-10-16 | 2012-10-16 | Acoustic logging transmitting transducer driving system |
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| Country | Link |
|---|---|
| CN (1) | CN202991019U (en) |
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2012
- 2012-10-16 CN CN 201220528607 patent/CN202991019U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130612 Termination date: 20151016 |
|
| EXPY | Termination of patent right or utility model |