CN104062686A - Signal generating and driving system for multi-frequency array electrical logging - Google Patents
Signal generating and driving system for multi-frequency array electrical logging Download PDFInfo
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Abstract
A signal generating and driving system for multi-frequency array electrical logging is mainly composed of a signal generating unit, a signal amplifying unit, a signal isolating unit and a high-frequency driving unit. The output end of the signal generating unit is connected with the input end of the signal amplifying unit. The output end of the signal amplifying unit is connected with the input end of the signal isolating unit. The output end of the signal isolating unit is connected with the input end of the high-frequency driving unit. Any wave signals of 62.5 kHz-10 MHz can be output by the signal generating unit and the signals of 62.5 kHz-10 MHz can be amplified through the signal amplifying unit. Transient large current signals can be isolated by the signal isolating unit, so that false triggering is avoided and a 62.5 kHz-10 MHz and 0-1 kW high-frequency and large-power MOSFET device is finally driven through the high-frequency driving unit.
Description
Technical field
The present invention relates to a kind of multifrequency array electric logging signal occurs and drive system.
Background technology
Electrical log fundamental purpose is to obtain resistivity or the specific inductive capacity information on stratum, and then combines other formation parameters in order to calculate hydrocarbon saturation and the distribution situation of judgement reservoir.Electrical log mainly comprises natural potential logging, resistivity logging, inductolog, electromagnetic propagation log etc.Electromagnetic propagation log claims again ultrahigh frequency dielectric log, to measure with closely-related Electromagnetic Wave Propagation time of stratum dielectric constant and electromagnetic wave attenuation to distinguish oil, water layer, determine stratum liquid water content, the electromagnetic wave of double frequency Jie electrical survey transmitting coil transmitting, two receiving coils receive signal, export two Amplitude Ratio and phase differential that receive signal.Conventional electrical survey (ES) is logged well mutually and is all belonged to the category of direct current well logging with side, for making to measure electric current by entering stratum in well, require must be full of in well mud or the water of conduction, but some information well is accurately to understand initial oil saturation or keep stratum primary permeability, often adopt oil-base mud or air drilling, make direct current well logging run into the difficulty that cannot overcome.Alternating electromagnetic field can be because not existing conducting medium to be restricted in well to the effect of stratum media and electromagnetic wave propagation, and inductolog has developed into a kind of main electrical log method in conventional logging suite.
Traditional inductolog is the electromotive force of measuring-signal, emissive source frequency is between 10～200kHz, to carry the secondary current of formation information at the electromotive force of receiving coil by measuring in stratum, obtain the information about stratum, because the induction field of secondary current in receiving coil is very faint with respect to the directly coupling signal of dispatch coil, when the reservoir exploration of complicated geological structure, effect is poor, longitudinal frame is low, investigation depth is more shallow.It is more serious that instrument is affected by the environmental impacts such as well, intrusion, country rock and skin effect, and the formation resistivity that provides is not accurate enough, the thin layer deteetability of image documentation equipment, can not meet the needs of well logging development.Along with inductolog develops rapidly at aspects such as Instrument Design and theoretical researches, there is array induction logging Image-forming instrument, greatly improved the performance of induction logging instrument.Array phase IRT is received coil system by a plurality of and is formed, and by composite signal frequency, a receipts coil system spacing and two receiving coil spacing, forms many covers receipts coil system, and one-shot measurement can obtain many cover well logging curve of stratum.This method has been expanded the measurement range of resistivity, has reduced the impact of well, mud and other factors.
The wider array electric well logging of application at present mainly contains array induction and electromagnetic propagation resistivity logging.Array induction application multifrequency, multi-source are apart from single-shot-mono-receipts probe, and frequency is many in tens KHz left and right.The source frequency of electromagnetic propagation resistivity logging is at several megahertzes, adopts phase differential and Amplitude Ratio between the induction electromotive force of single-shot-bis-receipts probe measurement receiving coils.
For transmission frequency, transmission frequency is lower, and radial depth of investigetion is larger.Increase transmission frequency and contribute to improve the intensity that receives signal, improve longitudinal layered ability.If High-frequency and low-frequency is combined together, can strengthen detectivity.The mode of low-and high-frequency combination can keep the longitudinal layered ability that array phase inductolog is very strong, can guarantee again the investigation depth of instrument.
Above-mentioned Method of Electrical Wells all needs reliable emission coefficient as support, and low-and high-frequency has good application prospect in conjunction with the high-power emission coefficient of multifrequency.And the key that the generation of wide frequency range signal and driver element formula low-and high-frequency design in conjunction with high-power emission coefficient, tens kHz have increased the complicacy of system to the signal generation of tens MHz wide frequency ranges and the driving method of high-power switch device.
In document multifrequency induction width phase logging theory and implementation method research, set forth the induction instrument emission coefficient of 0.8MHz, two kinds of frequencies of 6.4MHz, the power stage of emission coefficient is 10W.Signal generation of the present invention and drive system can realize the frequency range of 62.5kHz～10MHz, and driving force is for driving the High-frequency MOSFET switching tube of 0～1kW, can greatly expand the parameter area of well logging emission coefficient, for multifrequency array electric logging platform provides important method.
Summary of the invention
In order to meet the demand of well logging wide frequency range high-power driving, the signal that the present invention proposes a kind of wide frequency range occurs and drive system.The present invention can realize 62.5kHz～10MHz range of signal, effectively the driving force of output driving current 5A.
Multifrequency array electric logging signal occurs and a drive system, mainly signal generating unit, signal amplification unit, signal isolated location, high frequency drive unit, consists of.The output terminal of described signal generating unit is connected with the input end of signal amplification unit, and signal amplifies output terminal and is connected with the input end of signal isolated location, and the output terminal of signal isolation is connected with the input end of high-frequency drive.The output signal of signal generating unit inputs to signal amplification unit, the output signal of signal amplification unit inputs to signal isolated location, the output signal of signal isolated location inputs to high frequency drive unit, and the output of high-frequency driving signal finally can be 62.5kHz～10MHz high frequency and 0～1kW high-power MOSFET device provides driving.
Described signal generating unit is that the direct digital frequency synthesis technology DDS based on FPGA realizes, the random waveform signal of exportable 62.5kHz～10MHz.Signal amplification unit can be realized the amplification of 62.5kHz～10MHz signal, signal isolated location can be isolated the large current signal of transition, avoid false triggering, high-frequency drive can realize highest frequency 10MHz, maximum output current peak value 15A, effectively the driving force of output driving current 5A.Finally realize the driving of 62.5kHz～10MHz high frequency and 0～1kW high-power MOSFET device.
Described signal generating unit is by input control module, frequency integer control module, frequency decimal control module, control word computing, phase accumulator, address adjusting module, and wave memorizer module forms.The connected mode of above-mentioned module is: the output terminal of input control module is connected with the input end of frequency integer control module, and frequency integer control module is connected with the output terminal of frequency decimal control module, is also connected with control word computing module simultaneously; The output terminal of control word computing is connected with the input end of phase accumulator, and the output terminal of phase accumulator is connected with the output terminal of address adjusting module, and the output terminal of address adjusting module is connected with the input end of wave memorizer.The output signal of input control module inputs to frequency integer control module, the output signal of frequency integer control module and frequency decimal control module inputs to control word computing module simultaneously, the output signal of control word computing module inputs to phase accumulator module, the output signal of phase accumulator module inputs to address adjusting module, and the output of address adjusting module inputs to wave memorizer module.
The signal of described signal generating unit output 62.5kHz～10MHz frequency, the frequency of this signal is calculated by formula (1):
f
0＝(f
clk2
N)×A
0×K
0(1)
In formula, f
ofor output signal frequency, f
clkfor system reference clock frequency, N is phase accumulator figure place, A
0for frequency integer is controlled number, K
0for frequency decimal is controlled number.
It is 8, f that the present invention adopts N
clkfor 50MHz, K
0be made as fixed value 0.32.Work as A
0during round numbers 1, signal output frequency is 62.5kHz; Work as A
0during round numbers 160, signal output frequency is 10MHz.
Described signal amplification unit adopts wideband high-frequency video algorithms amplifier to realize, and bandwidth is 140MHz, and employing ± 15V supply voltage drives signal to realize and amplify output in 62.5kHz～10MHz scope, and signal voltage is 13V.
Described signal isolated location is three winding magnet rings, and this three windings magnet ring adopts radio frequency iron powder magnet ring, adopts the copper wire coiling arranged side by side of three tape insulation paints to form.The material of radio frequency iron powder magnet ring is Carbonyl E, and magnetic permeability is 10, and inductance coefficent is 5～25nH/N
2, applying frequency scope is 0.1～20MHz, can bear power is 88W.It is 3～20 circles that signal is isolated the three-winding coiling number of turn.
Signal is isolated three windings and is comprised three input ends and three output terminals, and input end is respectively: signal isolates that three-winding power input, signal are isolated three-winding signal input part, signal is isolated three-winding input grounding end; Output terminal is respectively signal and isolates that three-winding power output end, signal are isolated three-winding signal output part, signal is isolated three-winding output earth terminal.High-frequency drive 15V power supply connects signal isolated location, and the VCCIN that connects high frequency drive unit by signal isolated location is as power supply, and the output signal of signal amplification unit is delivered to the driving signal input IN of high frequency drive unit by signal isolated location.Signal isolated location connected mode is: the output of 15V power supply connects the power input that signal is isolated three winding magnet rings, the power output end that signal is isolated three winding magnet rings is connected to the power input of high frequency drive unit, the output terminal of signal amplification unit connects signal and isolates three-winding signal input part, signal is isolated three-winding signal and is inputed to high frequency drive unit, signal is isolated three-winding ground connection input end grounding, and signal is isolated the ground end that three-winding ground connection output terminal connects high frequency drive unit.Signal transmission form is: 15V power supply signal connects the power input that signal is isolated three winding magnet rings, by first via winding, and the VCCIN of this 15V power supply signal supply high frequency driver element.The output terminal of signal amplification unit connects signal and isolates three-winding signal input part, and by the second road winding, the signal output part that this driving signal is isolated three winding magnet rings at signal flows out.Common connects the input end that signal is isolated three winding magnet rings, holds and is connected the output terminal of isolating three winding magnet rings by signal and polystage amplifier.
Described high frequency drive unit is by diode, and polystage amplifier unit, MOSFET half-bridge and capacitor form.Diode can prevent that amplifier power supply from flowing into driving signal input.In high frequency drive unit, the connected mode of device is: the signal output part of the isolation three winding magnet rings of signal isolated location connects the input end of the polystage amplifier of high frequency drive unit, the output earth terminal of isolating three winding magnet rings connects the earth terminal of polystage amplifier, the signal output part of isolating three winding magnet rings connects the anode of diode simultaneously, the negative terminal of diode connects the power output end of isolation three winding magnet rings, polystage amplifier connects the input end of MOSFET half-bridge, MOSFET power end directly connects 15V power supply, MOSFET half-bridge power end is connected capacitor with MOSFET half-bridge ground end.The capacitor MOSFET half-bridge power end of trying one's best.The final output drive signal of output terminal of MOSFET half-bridge.Through high frequency drive unit, finally can realize the driving of 62.5kHz～10MHz, 0～1kW high-frequency high-power MOSFET device.
Accompanying drawing explanation
Fig. 1 multifrequency array electric logging signal occurs and drive system schematic diagram;
Fig. 2 multifrequency array electric logging signal generating unit is realized logical diagram;
Fig. 3 signal amplification unit, signal isolated location and high frequency drive unit annexation figure.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Multifrequency array electric logging signal generation of the present invention and drive system are comprised of signal generating unit, signal amplification unit, signal isolated location and high frequency drive unit as shown in Figure 1.Connected mode between foregoing circuit unit is: the output terminal of signal generating unit is connected with the input end of signal amplification unit, signal amplifies output terminal and is connected with the input end of signal isolated location, and the output terminal of signal isolation is connected with the input end of high-frequency drive.Signal transmission form is: the output signal of signal generating unit inputs to signal amplification unit, the output signal of signal amplification unit inputs to signal isolated location, the output signal of signal isolated location inputs to high frequency drive unit, and the signal of high frequency drive unit output finally can be realized the driving of high-power MOSFET.
The direct digital frequency synthesis technology DDS of described signal generating unit based on FPGA realizes, the random waveform signal of exportable 62.5kHz～10MHz.Signal amplification unit can be realized the amplification of 62.5kHz～10MHz signal, signal isolated location can be isolated the large current signal of transition, avoid false triggering, high-frequency drive can realize highest frequency 10MHz, maximum output current peak value 15A, effectively the driving force of output driving current 5A.Finally realize the driving of high-frequency high-power MOSFET device.
Described signal generating unit is by input control module, frequency integer control module, frequency decimal control module, control word computing, phase accumulator, address adjusting module, and wave memorizer module forms.The output terminal of input control module is connected with the input end of frequency integer control module, frequency integer control module is connected with control word computing module with the output terminal of frequency decimal control module simultaneously, the output terminal of control word computing is connected with the input end of phase accumulator, the output terminal of phase accumulator is connected with the output terminal of address adjusting module, and the output terminal of address adjusting module is connected with the input end of wave memorizer.The output signal of input control module inputs to frequency integer control module, the output signal of frequency integer control module and frequency decimal control module inputs to control word computing module simultaneously, the output signal of control word computing module inputs to phase accumulator module, the output signal of phase accumulator module inputs to address adjusting module, and the output of address adjusting module inputs to wave memorizer module.
Multifrequency array electric logging signal generating unit of the present invention is realized logical diagram as shown in Figure 2.
The signal of described signal generating unit output 62.5kHz～10MHz frequency, the frequency of this signal is calculated by following formula:
f
0＝(f
clk2
N)×A
0×K
0。
In formula, f
ofor output signal frequency, f
clkfor system reference clock frequency, N is phase accumulator figure place, A
0for frequency integer is controlled number, K
0for frequency decimal is controlled number.
It is 8, f that the present invention adopts N
clkfor 50MHz, K
0be made as fixed value 0.32.Work as A
0during round numbers 1, signal output frequency is 62.5kHz; Work as A
0during round numbers 160, signal output frequency is 10MHz.
Annexation between signal amplification unit, signal isolated location and high frequency drive unit as shown in Figure 3.Signal amplification unit adopts wideband high-frequency video algorithms amplifier to realize, and bandwidth is 140MHz, and employing ± 15V supply voltage drives signal to realize and amplify output in 62.5kHz～10MHz scope, and signal voltage is 13V.
Signal isolated location is three winding magnet rings.This three windings magnet ring is radio frequency iron powder magnet ring, by the copper wire coiling arranged side by side of three tape insulation paints, is formed.Radio frequency iron powder magnet ring material is Carbonyl E, and magnetic permeability is 10, and inductance coefficent is 5.7nH/N
2, applying frequency scope is 0.1～20MHz, can bear power 88W.It is 14 circles that signal is isolated the three-winding coiling number of turn.
The 15V power supply VCC of high-frequency drive, inputs to high-frequency drive by signal isolated location and holds power supply as VCCIN.The output signal of signal amplification unit is by signal isolated location input high frequency drive unit.The output of 15V power supply VCC connects the signal of signal isolated location and isolates three-winding power input 1, signal is isolated the power input VCCIN that three-winding power output end 2 is connected to high frequency drive unit, the output terminal of signal amplification unit connects signal and isolates three-winding signal input part 3, signal is isolated the signal input part that three-winding signal output part 4 inputs to high frequency drive unit, signal is isolated three-winding ground connection input end 5 ground connection, and signal is isolated the ground end that three-winding ground connection output terminal connects high frequency drive unit.The signal of 15V power supply signal inflow signal isolated location is isolated the power input 1 of three winding magnet rings, and by first via winding, the power output end 2 that this power supply signal is isolated three winding magnet rings at signal flows out; The signal of signal amplification unit output flows into the signal input part 3 that signal is isolated three winding magnet rings, and by the second road winding, the signal output part 4 that this signal is isolated three winding magnet rings at signal flows out; Common connects the ground connection input end 5 that signal is isolated three winding magnet rings, is isolated three-winding ground connection output terminal 6 and polystage amplifier and held to be connected by signal.
High frequency drive unit is comprised of diode, polystage amplifier unit, MOSFET half-bridge and capacitor.Diode can prevent that amplifier power supply from flowing into driving signal input.Connected mode between inner each device of high frequency drive unit is: the three-winding power output end 2 of isolation of signal isolated location connects the input end VCCIN of polystage amplifier, the input end of isolating three-winding signal output part 4 connection polystage amplifiers, the earth terminal of isolating three-winding ground connection output terminal 6 connection polystage amplifiers, isolate three-winding signal output part 4 and connect the anode of diode simultaneously, the negative terminal of diode connects the three-winding power output end 2 of isolation, polystage amplifier connects the input end of MOSFET half-bridge, the power end of MOSFET half-bridge directly connects 15V power supply, MOSFET half-bridge power end is connected capacitor with MOSFET half-bridge ground end.The capacitor MOSFET half-bridge power end of trying one's best.The final output drive signal of output terminal of MOSFET half-bridge, this driving can be directly used in the driving of 62.5kHz～10MHz, 0～1kW high-frequency high-power MOSFET device.
Claims (7)
1. multifrequency array electric logging signal occurs and a drive system, it is characterized in that, described multifrequency array electric logging signal occurs and drive system is mainly comprised of signal generating unit, signal amplification unit, signal isolated location and high frequency drive unit; The output terminal of signal generating unit is connected with the input end of signal amplification unit, and signal amplifies output terminal and is connected with the input end of signal isolated location, and the output terminal of signal isolation is connected with the input end of high-frequency drive; The output signal of signal generating unit inputs to signal amplification unit, and the output signal of signal amplification unit inputs to signal isolated location, and the output signal of signal isolated location inputs to high-frequency drive.
2. multifrequency array electric logging signal according to claim 1 occurs and drive system, it is characterized in that: described signal generating unit is by input control module, frequency integer control module, frequency decimal control module, control word computing, phase accumulator, address adjusting module, and wave memorizer module forms; The output terminal of described input control module is connected with the input end of frequency integer control module, and frequency integer control module is connected with the output terminal of frequency decimal control module, is also connected with control word computing module simultaneously; The output terminal of control word computing is connected with the input end of phase accumulator, and the output terminal of phase accumulator is connected with the output terminal of address adjusting module; The output terminal of address adjusting module is connected with the input end of wave memorizer; The output signal of described input control module inputs to frequency integer control module, the output signal of frequency integer control module and frequency decimal control module inputs to control word computing module simultaneously, the output signal of control word computing module inputs to phase accumulator module, the output signal of phase accumulator module inputs to address adjusting module, and the output of address adjusting module inputs to wave memorizer module.
3. multifrequency array electric logging signal according to claim 1 occurs and drive system, it is characterized in that: described signal isolated location is three winding magnet rings; This three windings magnet ring is radio frequency iron powder magnet ring, by the copper wire coiling arranged side by side of three tape insulation paints, is formed; Radio frequency iron powder magnet ring material is Carbonyl E, and magnetic permeability is 10, and inductance coefficent is 5～25nH/N
2, applying frequency scope is 0.1～20MHz, the coiling number of turn is 4～20 circles.
4. multifrequency array electric logging signal according to claim 1 occurs and drive system, it is characterized in that: in described high frequency drive unit, high-frequency drive 15V power supply connects signal isolated location, the VCCIN that connects high frequency drive unit by signal isolated location is as power supply, and the output signal of signal amplification unit is delivered to the driving signal input IN of high frequency drive unit by signal isolated location; The signal of the output connection signal isolated location of 15V power supply is isolated the power input (1) of three winding magnet rings, the power output end (2) that signal is isolated three winding magnet rings is connected to the power input VCCIN of high frequency drive unit, the output terminal of signal amplification unit connects signal and isolates three-winding signal input part (3), and signal is isolated the output signal of three-winding signal output part (4) and transported to high frequency drive unit; Signal is isolated three-winding ground connection input end (5) ground connection, and signal is isolated the ground end that three-winding ground connection output terminal (6) connects high-frequency drive; Common connects the ground connection input end (5) that signal is isolated three winding magnet rings, holds and is connected the ground connection output terminal (6) of isolating three winding magnet rings by signal and polystage amplifier.
5. multifrequency array electric logging signal according to claim 1 occurs and drive system, it is characterized in that: described high frequency drive unit is by diode, and polystage amplifier unit, MOSFET half-bridge and capacitor form, the power output end (2) of isolating three winding magnet rings connects the power supply VCCIN input end of polystage amplifier, the signal output part (4) of isolating three winding magnet rings connects the signal input part IN of polystage amplifier, the ground connection output terminal (6) of isolating three winding magnet rings connects the earth terminal of polystage amplifier, the signal output part (4) of isolating three winding magnet rings also connects the anode of diode simultaneously, the negative terminal of diode connects the power output end (2) of isolation three winding magnet rings, polystage amplifier connects the input end of MOSFET half-bridge, the power end of MOSFET half-bridge directly connects 15V power supply, MOSFET half-bridge power end is connected capacitor with MOSFET half-bridge ground end, the output terminal output drive signal of MOSFET half-bridge.
6. multifrequency array electric logging signal according to claim 1 occurs and drive system, it is characterized in that: the random waveform signal that described signal generating unit output frequency is 62.5kHz～10MHz; Signal amplification unit is realized the amplification of 62.5kHz～10MHz signal; The large current signal of signal isolated location isolation transition, avoids false triggering, and high-frequency drive realizes highest frequency 10MHz, maximum output current peak value 15A, and effectively the driving force of output driving current 5A, finally realizes the driving of MOSFET device.
7. multifrequency array electric logging signal according to claim 6 occurs and drive system, it is characterized in that: the frequency of described signal generating unit output signal output is calculated by following formula:
f
0＝(f
clk2
N)×A
0×K
0
In formula, f
ofor output signal frequency, f
clkfor system reference clock frequency, N is phase accumulator figure place, A
0for frequency integer is controlled number, K
0for frequency decimal is controlled number.
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| US4415895A (en) * | 1981-02-11 | 1983-11-15 | Dresser Industries, Inc. | Well logging data transmission system |
| US4829486A (en) * | 1981-03-10 | 1989-05-09 | Standard Oil Company (Indiana) | Transmitting multiple borehole parameters in sonic logging |
| US4506263A (en) * | 1981-05-19 | 1985-03-19 | Mobil Oil Corporation | Data transmission system for logging tools |
| CN103590810A (en) * | 2013-10-26 | 2014-02-19 | 中国石油化工集团公司 | Power-adjustable emitting device used for transient electromagnetic logging |
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