CN105003217B - Mud positive pulse signal drive system and square wave pulse width modulator approach - Google Patents
Mud positive pulse signal drive system and square wave pulse width modulator approach Download PDFInfo
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- CN105003217B CN105003217B CN201510422879.3A CN201510422879A CN105003217B CN 105003217 B CN105003217 B CN 105003217B CN 201510422879 A CN201510422879 A CN 201510422879A CN 105003217 B CN105003217 B CN 105003217B
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- 238000001914 filtration Methods 0.000 claims abstract description 31
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 230000014759 maintenance of location Effects 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 6
- 238000000205 computational method Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 2
- 238000005553 drilling Methods 0.000 description 9
- 238000005070 sampling Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 210000001367 artery Anatomy 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 210000003462 vein Anatomy 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
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Abstract
A kind of mud positive pulse signal drive system and square wave pulse width modulator approach.System includes mud turbine generator, current rectifying and wave filtering circuit, voltage collection circuit, microprocessor, voltage conversion circuit, signal drive circuit and pulse signal generator；Mud turbine generator is connected by the input of current rectifying and wave filtering circuit and voltage collection circuit, the output end of voltage collection circuit is connected with microprocessor, microprocessor is connected with voltage conversion circuit and signal drive circuit respectively, and signal drive circuit is connected with the input of voltage collection circuit and pulse signal generator.Effect of the present invention：Driving voltage using current rectifying and wave filtering circuit output voltage as pulse signal generator, microprocessor receives the voltage signal, the dutyfactor value of pulsewidth modulation square wave is calculated using interpolation algorithm, it is simple in construction, it is easily achieved, for the mud generating voltage of wide input voltage range, it is ensured that the stability of pulse signal generator driving voltage, improve the driving force of pulse signal generator.
Description
Technical field
The present invention relates to a kind of drive system for intelligent drilling instrument drilling fluid positive pulse signal, more particularly to one
Kind mud positive pulse signal drive system and square wave pulse width modulator approach.
Background technology
In intelligent drilling instrument, use drilling fluid mud as the wireless transmission method of transmission medium with its reliability
Well, extensive use has been obtained the advantages that long transmission distance.Wherein, mud positive pulse transmission means is by controlling mud-pulse to send out
The needle valve action of raw device changes the cross-sectional area of mud runner, thus produces pressure pulse signal.Due to intelligent drilling instrument
Phenomena such as violent shock and vibration in the course of work of shaft bottom be present, therefore mud flow rate fluctuation range is larger, using mud whirlpool
The mud pulse generator that turbine generator provides driving force has that mains ripple is big, and stability is poor, influences pulse signals
The driving force of generator, frame losing in mud-pulse transmitting procedure, the situation of no signal are caused, so as to cause ground decoding wrong
It can not even decode by mistake.
Therefore, design one kind is based on monolithic processor controlled intelligent drilling instrument drilling fluid positive pulse signal drive system and side
Wave impulse modulator approach, under the poor working conditions of shaft bottom, ensure that pulse signals generator there are enough driving forces, ensure
Inserting tube measurement, coded data correctly, can be uploaded stably, be had great importance.
The content of the invention
In order to solve the above problems, it is an object of the invention to provide a kind of mud positive pulse signal drive system and square wave
Pulse duration modulation method.
In order to achieve the above object, mud positive pulse signal drive system provided by the invention includes：Slurry turbine generates electricity
Machine, current rectifying and wave filtering circuit, voltage collection circuit, microprocessor, voltage conversion circuit, signal drive circuit and pulse signal occur
Device；Mud turbine generator by the input of current rectifying and wave filtering circuit and voltage collection circuit connect, voltage collection circuit it is defeated
Go out end to be connected with microprocessor, microprocessor is connected with voltage conversion circuit and signal drive circuit respectively, signal drive circuit
It is connected with the input of voltage collection circuit and pulse signal generator.
Square wave pulse width modulator approach includes what is performed in order used by described mud positive pulse signal drive system
The following steps：
Step 1：When microprocessor receives useful signal, the work of drive pulse signal generator needs larger current, works as arteries and veins
Signal generator action is rushed after producing coded pulse, in useful signal time T, the work can be kept by only needing the electric current of very little
Make state, previous time period is designated as initial time T1, and latter time period is designated as retention time T2, T=T1+T2, according to described
The threshold range of current rectifying and wave filtering circuit output voltage establishes interpolation table respectively：
A [n]={ a1,a2,……,an, n is the natural number more than 1
B [m]={ b1,b2,……,bm, m is the natural number more than 1
Wherein, A is pulsewidth modulation square wave interpolation table in initial time T1, works as i<During j, there is ai>aj, 1≤i≤n, 1≤j≤
N, B are pulsewidth modulation square wave interpolation table in retention time T2, work as k<During l, there is ak>al, 1≤k≤m, 1≤l≤m；
Step 2：The current rectifying and wave filtering circuit output voltage values obtained according to voltage collection circuit measurement calculate the output voltage
The position coordinates of interpolation table sequence corresponding to value：
I=* (p+ (Vin-Vmin)/H)
Wherein, p be interpolation table sequence initial address, VinFor current rectifying and wave filtering circuit output voltage values, VminFor rectifying and wave-filtering
The bottom threshold of circuit output voltage, H are constant, and computational methods are：
H=(Vmax–Vmin)/n
Wherein, VmaxFor the upper threshold of current rectifying and wave filtering circuit output voltage；
Step 3：According to the position of interpolation table sequence corresponding to the current rectifying and wave filtering circuit output voltage values obtained in step 2
Coordinate calculates dutyfactor value：
D=(PWMPER-B [i] × PWMPER/100)/PWMPER × 100%
Wherein, D is the dutyfactor value of pulse-width modulation waveform, and PWMPER is that dutyfactor value quantifies the upper limit；
Step 4：When microprocessor receives the useful signal of voltage conversion circuit output, within the T1 periods, according to
Step 2 calculates the dutycycle of output pulse width modulated square wave to pulsewidth modulation square wave interpolation table A in step 3 inquiry initial time T1
Value, within the T2 periods, output is calculated according to pulsewidth modulation square wave interpolation table B in step 2 to step 3 inquiry retention time T2
The dutyfactor value of pulsewidth modulation square wave, drive pulse signal generator regular event；When microprocessor does not receive voltage conversion
During the useful signal of circuit output, the output of pulse width modulation square wave, pulse signal generator attonity.
The invention has the advantages that using current rectifying and wave filtering circuit output voltage as the driving electricity of pulse signal generator
Pressure, microprocessor receive the voltage signal, and the dutyfactor value of pulsewidth modulation square wave is calculated using interpolation algorithm, simple in construction, easily
In realization, for the mud generating voltage of wide input voltage range, it is ensured that the stability of pulse signal generator driving voltage,
The driving force of pulse signal generator is improved, frame losing, the risk of no signal occurs when reducing coded pulse transmission.
Brief description of the drawings
Fig. 1 is the structured flowchart of mud positive pulse signal drive system provided by the invention.
Square wave pulse width modulator approach flow chart used by microprocessor in Fig. 2 the system.
Fig. 3 is that SCM Based mud positive pulse signal drivetrain unifies oscillograph sectional drawing during embodiment work.
Fig. 4 is Fig. 3 partial enlarged drawing.
Embodiment
Below in conjunction with the accompanying drawings with specific embodiment to mud positive pulse signal drive system provided by the invention and square wave arteries and veins
Wide modulator approach is described in detail.
As shown in figure 1, mud positive pulse signal drive system provided by the invention includes：Mud turbine generator 1, rectification
Filter circuit 2, voltage collection circuit 3, microprocessor 4, voltage conversion circuit 5, signal drive circuit 6 and pulse signal generator
7；Mud turbine generator 1 is connected by current rectifying and wave filtering circuit 2 with the input of voltage collection circuit 3, voltage collection circuit 3
Output end is connected with microprocessor 4, and microprocessor 4 is connected with voltage conversion circuit 5 and signal drive circuit 6 respectively, and signal drives
Dynamic circuit 6 is connected with the input of voltage collection circuit 3 and pulse signal generator 7.
Described mud turbine generator 1 produces low-frequency ac electric energy, for being powered for whole drive system；
Current rectifying and wave filtering circuit 2 is used to low-frequency ac electric energy caused by mud turbine generator 1 being converted into direct current energy；
Voltage collection circuit 3 is used for the direct current energy signal for sampling the output of current rectifying and wave filtering circuit 2, and sampled value is sent into micro-
In processor 4；
Microprocessor 4 produces the pulsewidth modulation square wave of certain dutyfactor value during inserting tube uploads useful signal, and exports
Into signal drive circuit 6；
The input of voltage conversion circuit 5 is connected with inserting tube, and the signal for being uploaded to inserting tube carries out level conversion, and defeated
Go out into microprocessor 4；
Signal drive circuit 6 is during inserting tube uploads useful signal using the output voltage of current rectifying and wave filtering circuit 2 as arteries and veins
The driving voltage of signal generator 7 is rushed, drive pulse signal generator 7 acts, and produces mud pulse signal；
Pulse signal generator 7 is used for when inserting tube uploads efficient coding signal, using thereon under the control of microprocessor 4
Acting to change the cross-sectional area of mud runner for needle-valve, produces pressure pulse signal.
Described voltage collection circuit 3 samples the output voltage signal of current rectifying and wave filtering circuit 2 and is sent into microprocessor 4,
Microprocessor 4 calculates pulsewidth modulation square wave when receiving the useful signal of the output of voltage conversion circuit 5 according to the output voltage
Dutyfactor value in a cycle is big not because of mud flow rate by the average current of pulse signal generator 7 to adjust
Scope fluctuates and acute variation, ensures the stability that pulse signal generator 7 works.
As shown in Fig. 2 square wave pulse width modulator approach used by mud positive pulse signal drive system provided by the invention
Including the following steps performed in order：
Step 1：When microprocessor 4 receives useful signal, the work of drive pulse signal generator 7 needs larger current, when
After pulse signal generator 7 acts and produces coded pulse, in useful signal time T, only needing the electric current of very little can keep
The working condition, previous time period are designated as initial time T1, and latter time period is designated as retention time T2, T=T1+T2, according to institute
The threshold range for the output voltage of current rectifying and wave filtering circuit 2 stated establishes interpolation table respectively：
A [n]={ a1,a2,……,an, n is the natural number more than 1
B [m]={ b1,b2,……,bm, m is the natural number more than 1
Wherein, A is pulsewidth modulation square wave interpolation table in initial time T1, works as i<During j, there is ai>aj, 1≤i≤n, 1≤j≤
N, B are pulsewidth modulation square wave interpolation table in retention time T2, work as k<During l, there is ak>al, 1≤k≤m, 1≤l≤m；
Step 2：The obtained output voltage values of current rectifying and wave filtering circuit 2 are measured according to voltage collection circuit 3 and calculate output electricity
The position coordinates of interpolation table sequence corresponding to pressure value：
I=* (p+ (Vin-Vmin)/H)
Wherein, p be interpolation table sequence initial address, VinFor the output voltage values of current rectifying and wave filtering circuit 2, VminFiltered for rectification
The bottom threshold of the output voltage of wave circuit 2, H are constant, and computational methods are：
H=(Vmax–Vmin)/n
Wherein, VmaxFor the upper threshold of the output voltage of current rectifying and wave filtering circuit 2；
Step 3：According to the position of interpolation table sequence corresponding to the output voltage values of current rectifying and wave filtering circuit 2 obtained in step 2
Put coordinate and calculate dutyfactor value：
D=(PWMPER-B [i] × PWMPER/100)/PWMPER × 100%
Wherein, D is the dutyfactor value of pulse-width modulation waveform, and PWMPER is that dutyfactor value quantifies the upper limit；
Step 4：When microprocessor 4 receives the useful signal of the output of voltage conversion circuit 5, within the T1 periods, root
The duty of output pulse width modulated square wave is calculated according to pulsewidth modulation square wave interpolation table A in step 2 to step 3 inquiry initial time T1
Ratio, within the T2 periods, calculated according to pulsewidth modulation square wave interpolation table B in step 2 to step 3 inquiry retention time T2 defeated
Go out the dutyfactor value of pulsewidth modulation square wave, drive pulse signal generator 7 is operating normally；When microprocessor 4 does not receive voltage
During the useful signal that change-over circuit 5 exports, the output of pulse width modulation square wave, the attonity of pulse signal generator 7.
The operation principle of the system is as follows：As shown in figure 1, low frequency threephase AC electric energy caused by mud turbine generator 1
Rectified filter circuit 2 is converted into direct current energy and exported, the driving voltage using the direct current energy as pulse signal generator 7,
Meanwhile the direct current energy enters in microprocessor 4 after the sampling of voltage collection circuit 3；Voltage conversion circuit 5 is responsible for surveying inserting tube
The pulse signal sampling after data are encoded is measured, when microprocessor 4 receives the efficient coding arteries and veins of the output of voltage conversion circuit 5
When rushing, dutyfactor value of the pulsewidth modulation square wave in a cycle is calculated according to interpolation algorithm, in efficient coding pulse period
It is interior, pulsewidth modulation square wave sequence is sent to signal drive circuit 6, the action of drive pulse signal generator 7 produces coded pulse letter
Number, using drilling fluid mud as transmission medium, transmit to ground standpipe, for ground staff to downhole intelligent drilling well after signal demodulates
Tool status carries out analysis decision.
As shown in Fig. 2 after system electrification, microprocessor 4 carries out I/O port initializations and PWM parameter initializations first, if
The sampling time interval of voltage signal is put, starts timer and allows to interrupt, when the sampling interval of setting arrives, is adopted by voltage
Collector 3 carries out the sampling of the output voltage of current rectifying and wave filtering circuit 2, and microprocessor 4 receives sampled voltage and zero computing time section
T1 dutyfactor values, output pulse width modulation waveform, if not arriving the sampling time interval of setting, whether detection voltage conversion circuit 5
Useful signal is exported, if being not detected by, closes the output of pulsewidth modulation square wave, pulse signal generator 7 is stopped, if detection
To useful signal, then judge whether in initial time section T1, if so, then according to the initial time section T1 dutyfactor values of calculating
Output pulse width modulation waveform, drive pulse signal generator 7 work, if it is not, then calculating retention time section T2 dutyfactor value simultaneously
Output pulse width modulation waveform, it is maintained the state of pulse signal generator 7.
Fig. 3 is one embodiment of the invention oscilloscope display image, and inserting tube up-delivering signal waveform is simulated by signal generator,
Channel oscilloscope 1 connects the output of signal generator square-wave pulse, and channel oscilloscope 2 connects the pulse-width modulation waveform of microprocessor 4
Output pin, channel oscilloscope 3 connect output voltage after rectifying and wave-filtering, and channel oscilloscope 4 connects pulse signal generator 7, by
Scheme it is visible, in efficient coding pulse period, the output pulse width modulated square wave of microprocessor 4, the work of drive pulse signal generator 7
Make, in initial time section T1, pulse signal generator 7 needs larger driving current, and its both end voltage value is higher, is keeping
In period T2, pulse signal generator 7 needs smaller current i.e. tenability, and its both end voltage value is relatively low.
Fig. 4 be Fig. 3 partial enlarged drawing, as seen from the figure, in initial time section T1, pulse signal generator 7 need compared with
Big driving current, therefore the pulsewidth modulation duty cycle square wave value that microprocessor 4 exports is higher, in retention time section T2, pulse
7 less current values of need of signal generator can keep driving condition, therefore the pulsewidth modulation square wave duty that microprocessor 4 exports
Ratio is relatively low.
The problems such as it is an object of the invention to for frame losing present in mud pulse signal transmitting procedure, no signal, carry
Go out a kind of driving method of mud pulse generator, measured according to the inserting tube received, coded data, interpolation is used by single-chip microcomputer
Algorithm produces the pulse width modulated wave of certain dutyfactor value, in period for being arrived in valid data, drive pulse signal hair
Raw device 7 produces coded pulse.
The preferred embodiments of the present invention are these are only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (1)
1. square wave pulse width modulator approach used by a kind of mud positive pulse signal drive system, described mud positive pulse signal
Drive system includes：Mud turbine generator (1), current rectifying and wave filtering circuit (2), voltage collection circuit (3), microprocessor (4), electricity
Voltage conversion circuit (5), signal drive circuit (6) and pulse signal generator (7)；Mud turbine generator (1) is filtered by rectification
Wave circuit (2) is connected with the input of voltage collection circuit (3), the output end of voltage collection circuit (3) and microprocessor (4) connect
Connect, microprocessor (4) is connected with voltage conversion circuit (5) and signal drive circuit (6) respectively, signal drive circuit (6) and electricity
Press the connection of the input of Acquisition Circuit (3) and pulse signal generator (7)；
It is characterized in that：Described square wave pulse width modulator approach includes the following steps performed in order：
Step 1：When microprocessor (4) receives useful signal, drive pulse signal generator (7) work needs larger current, when
Pulse signal generator (7) is acted after producing coded pulse, and in useful signal time T, only needing the electric current of very little can protect
The working condition is held, previous time period is designated as initial time T1, and latter time period is designated as retention time T2, T=T1+T2, according to
The threshold range of described current rectifying and wave filtering circuit (2) output voltage establishes interpolation table respectively：
A [n]={ a1,a2,……,an, n is the natural number more than 1
B [m]={ b1,b2,……,bm, m is the natural number more than 1
Wherein, A is pulsewidth modulation square wave interpolation table in initial time T1, works as i<During j, there is ai>aj, 1≤i≤n, 1≤j≤n, B are
Pulsewidth modulation square wave interpolation table, works as k in retention time T2<During l, there is ak>al, 1≤k≤m, 1≤l≤m；
Step 2：Current rectifying and wave filtering circuit (2) output voltage values obtained according to voltage collection circuit (3) measurement calculate output electricity
The position coordinates of interpolation table sequence corresponding to pressure value：
I=* (p+ (Vin-Vmin)/H)
Wherein, p be interpolation table sequence initial address, VinFor current rectifying and wave filtering circuit (2) output voltage values, VminFor rectifying and wave-filtering
The bottom threshold of circuit (2) output voltage, H is constant, and computational methods are：
H=(Vmax–Vmin)/n
Wherein, VmaxFor the upper threshold of current rectifying and wave filtering circuit (2) output voltage；
Step 3：According to the position of interpolation table sequence corresponding to current rectifying and wave filtering circuit (2) output voltage values obtained in step 2
Coordinate calculates dutyfactor value：
D=(PWMPER-A [i] × PWMPER/100)/PWMPER × 100%, within the T1 times；
D=(PWMPER-B [i] × PWMPER/100)/PWMPER × 100%, within the T2 times；
Wherein, D is the dutyfactor value of pulse-width modulation waveform, and PWMPER is that dutyfactor value quantifies the upper limit；
Step 4：When microprocessor (4) receives the useful signal of voltage conversion circuit (5) output, within the T1 periods, root
The duty of output pulse width modulated square wave is calculated according to pulsewidth modulation square wave interpolation table A in step 2 to step 3 inquiry initial time T1
Ratio, within the T2 periods, calculated according to pulsewidth modulation square wave interpolation table B in step 2 to step 3 inquiry retention time T2 defeated
Go out the dutyfactor value of pulsewidth modulation square wave, drive pulse signal generator (7) regular event；When microprocessor (4) does not receive
During the useful signal of voltage conversion circuit (5) output, the output of pulse width modulation square wave, pulse signal generator (7) attonity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510422879.3A CN105003217B (en) | 2015-07-17 | 2015-07-17 | Mud positive pulse signal drive system and square wave pulse width modulator approach |
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| CN201510422879.3A CN105003217B (en) | 2015-07-17 | 2015-07-17 | Mud positive pulse signal drive system and square wave pulse width modulator approach |
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| CN105003217B true CN105003217B (en) | 2017-11-17 |
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| CN113300593B (en) * | 2021-04-20 | 2022-08-30 | 辽宁长风科技有限责任公司 | Direct-current voltage-stabilized power supply system for while-drilling instrument |
| CN115559713B (en) * | 2022-09-14 | 2025-06-24 | 中海石油(中国)有限公司 | A linear frequency modulation signal processing system and method for wireless transmission of sound waves |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101749010B (en) * | 2008-12-17 | 2013-04-10 | 中国石化集团胜利石油管理局钻井工艺研究院 | Testing device of mud pulse generator |
| CN201588627U (en) * | 2010-01-25 | 2010-09-22 | 中国石油化工集团公司 | Power driver for slurry pulse generator |
| CA2738271A1 (en) * | 2011-04-28 | 2012-10-28 | Sondex Wireline Ltd. | Measurement-while-drilling mud pulser and method for controlling same |
| US20130222149A1 (en) * | 2012-02-24 | 2013-08-29 | Schlumberger Technology Corporation | Mud Pulse Telemetry Mechanism Using Power Generation Turbines |
| CN204782868U (en) * | 2015-07-17 | 2015-11-18 | 中国石油集团渤海钻探工程有限公司 | Positive pulse signal actuating system of mud |
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Effective date of registration: 20210827 Address after: 100007 No. 9 North Main Street, Dongcheng District, Beijing, Dongzhimen Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC Bohai Drilling Engineering Co.,Ltd. Address before: 300457 Tianjin Binhai New Area Development Zone Huanghai Road 106 Bohai Drilling Engineering Co., Ltd. science and Technology Development Office Patentee before: CNPC Bohai Drilling Engineering Co.,Ltd. |
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