CN105634307A - Underground power supply implement method of intelligent drilling tool and pulse driving method and circuit - Google Patents
Underground power supply implement method of intelligent drilling tool and pulse driving method and circuit Download PDFInfo
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- CN105634307A CN105634307A CN201610124425.2A CN201610124425A CN105634307A CN 105634307 A CN105634307 A CN 105634307A CN 201610124425 A CN201610124425 A CN 201610124425A CN 105634307 A CN105634307 A CN 105634307A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/23—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only arranged for operation in parallel
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/04—Control effected upon non-electric prime mover and dependent upon electric output value of the generator
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Abstract
The invention creates and provides an underground power supply and pulse driving circuit of an intelligent drilling tool. The circuit comprises a mud turbine power generator, a three-phase rectification filter circuit, a voltage stabilization circuit, a probe pipe, a signal acquisition circuit, a control circuit and a driving circuit which are sequentially connected, the voltage stabilization circuit is a parallel circuit of n independent voltage stabilization power supplies, each voltage stabilization power supply comprises a loop circuit which is formed by sequentially connecting a flyback transformer, a half-wave rectification filter circuit, a feedback circuit and a pulse width modulation circuit, and the output end of the half-wave rectification filter circuit is connected with the probe pipe. The underground power supply and pulse driving circuit created by the invention has the advantages that an underground power supply and pulse driving system is designed based on a pulse width modulation technology, a flyback switching voltage stabilization power supply is used for electric energy conversion according to power utilization demand of a load to acquire stable DC electric energy output; and a pulse width modulation port of a microprocessor outputs a pulse width modulation waveform with a certain duty ratio value, and the stability of driving current of a pulse signal generator is ensured.
Description
Technical field
The invention belongs to oil, gas drilled hole technical field, especially relates to a kind of intelligent drilling instrument down-hole power implementation method and pulse drive method and circuit.
Background technology
In oil drilling tool, drilling fluid mud washes away the rotor of turbo-generator, turbo-generator produces low frequency three-phase alternating current electric energy, for being the electricity consumption load supplyings such as oil drilling tool electronically controlled unit, simultaneously, drilling fluid mud, as transmission medium, adopts pulse signal generator to realize the transmitted in both directions of down-hole inserting tube measurement signal and ground control signal by changing the cross-sectional area of mud runner according to coding requirement. But, due in drilling process, the fluctuation of drilling fluid mud displacement is bigger, cause the electric energy changed out by mud turbine generator to there is bigger fluctuation, cause the stability with electrical load work poor, when pulse signal generator produces pulse signal, service voltage instability can cause pulse signal generator driving force not enough, signals transmission exists frame losing or signal interrupted, thus cause ground decoding error or no signal, affect serviceability and the work-ing life of intelligent drilling instrument.
Pulse modulation technology maintains the technology of stabilized voltage output as a kind of ratio by controlling power device make-and-break time, have that wide input voltage range, volume are little, efficiency advantages of higher, it is applied in the design of down-hole power system, the wide input range AC energy changed out by mud turbine generator converts suitable stable direct current energy to according to different loads demand and exports, it is to increase with the stability of electrical load work and security; For the feature of mud turbine generator converting electrical energy wide ranges, the service voltage of pulse modulation technology pulse signals producer is adopted to carry out properly distributed, ensure that pulse signal generator drives the stability of electric current to make it have enough driving forces, improve the stability of mud-pulse Signal transmissions and accuracy, reduce the frame losing because existing in signals transmission, risk that underground survey data that no signal phenomenon causes are lost.
Summary of the invention
In view of this, the invention is intended to propose a kind of intelligent drilling instrument down-hole power and pulsed drive circuit, and to solve, the down-hole power system power supply stability that mud flow rate fluctuation causes greatly is poor, the problem of pulse signal generator driving force deficiency.
For achieving the above object, the technical scheme of the invention is achieved in that
A kind of intelligent drilling instrument down-hole power and pulsed drive circuit, comprise the mud turbine generator, three-phase current rectifying and wave filtering circuit, voltage stabilizing circuit, inserting tube, signals collecting circuit, pilot circuit and the driving circuit that connect successively,
Described voltage stabilizing circuit is the parallel-connection structure of n independent voltage stabilized source, voltage stabilized source described in each includes the loop circuit connected and composed successively by inverse-excitation type transformer, half-wave rectification filtering circuit, reaction circuit, pulse-width modulation circuit, the input terminus of described inverse-excitation type transformer connects three-phase current rectifying and wave filtering circuit, and the output terminal of described half-wave rectification filtering circuit connects inserting tube; Wherein, n be more than or equal to 1 natural number;
The output end signal of the input terminus connection current rectifying and wave filtering circuit of described signals collecting circuit, the output end signal of voltage stabilizing circuit, the output end signal of inserting tube;
Described pilot circuit comprises microprocessor, the output terminal of described microprocessor connection signal Acquisition Circuit;
Described driving circuit also connects the output end signal of three-phase current rectifying and wave filtering circuit.
Further, it being provided with protection circuit between described three-phase current rectifying and wave filtering circuit and the pulse-width modulation circuit of voltage stabilizing circuit, described protection circuit comprises voltage protection circuit and current protecting circuit, and voltage protection circuit comprises under-voltage protecting circuit and overvoltage protection circuit.
Further, it is equipped with flow equalizing circuit between half-wave rectification filtering circuit and inserting tube described in each, described flow equalizing circuit connection signal Acquisition Circuit and reaction circuit.
Further, it is provided with shock absorbing circuit between described three-phase current rectifying and wave filtering circuit and voltage stabilizing circuit, the shock absorbing circuit resistance that can be shaken by disappearing by the oscillating voltage of sampling imports ground terminal.
Relative to prior art, the invention intelligent drilling instrument down-hole power and pulsed drive circuit have following advantage:
Down-hole power and pulsed drive system is designed based on pulse modulation technology, electric energy conversion is carried out by flyback switch voltage-stabilized source according to load need for electricity, obtain stable direct current energy to export, the pulse-width modulation waveform of certain dutyfactor value is exported by microprocessor width modulation port, ensure that pulse signal generator drives the stable of electric current, meet at down-hole high temperature, vibration, the need for electricity of intelligent drilling instrument electronically controlled unit even load under the severe environment such as impact, when ensureing that pulse signal generator works, there is enough driving forces, improve the stability of intelligent drilling instrument underground work, security and work-ing life.
Another object of the invention is to propose a kind of intelligent drilling instrument down-hole power implementation method and pulse drive method, to solve, the down-hole power system power supply stability that mud flow rate fluctuation causes greatly is poor, the problem of pulse signal generator driving force deficiency.
For achieving the above object, the technical scheme of the invention is achieved in that
A kind of intelligent drilling instrument down-hole power implementation method and pulse drive method, it is characterised in that comprise following content:
Step 1: produce low frequency three-phase alternating current electric energy by turbo-generator;
Step 2: AC energy is carried out rectifying and wave-filtering by three-phase current rectifying and wave filtering circuit;
Step 3: by the output voltage of voltage protection circuit sampling three-phase current rectifying and wave filtering circuit, the loop current of down-hole power system of being sampled by current protecting circuit,
When the output voltage of three-phase current rectifying and wave filtering circuit, when the loop current of down-hole power system is within the scope of secure threshold, the thick direct current energy that three-phase current rectifying and wave filtering circuit exports is converted to high frequency AC energy by inverse-excitation type transformer, by half-wave rectification filtering circuit, high frequency AC energy carried out half-wave rectification and electric capacity filtering again, simultaneously by the output voltage of reaction circuit sampling half-wave rectification filtering circuit, send into pulse-width modulation circuit, the dutyfactor value of pulse signal in one-period is adjusted by pulse-width modulation circuit, to control the energy conversion efficiency of inverse-excitation type transformer, wherein inverse-excitation type transformer, half-wave rectification filtering circuit, reaction circuit, the loop circuit that pulse-width modulation circuit connects and composes successively forms voltage stabilized source, wherein when loading demand power is relatively big, single voltage stabilized source can not meet when requiring, adopts the structure of n voltage stabilized source parallel connection,
When detecting that voltage and current value are in outside the threshold range set in advance, the pulse-width modulation circuit in voltage stabilized source stops output pulse signal, inverse-excitation type transformer stopping work, and voltage stabilized source exports without electric energy;
Step 4: when loading demand power is bigger, single voltage stabilized source can not meet when requiring, by the outward current of the half-wave rectification filtering circuit of flow equalizing circuit sampling voltage stabilized source, Drazin inverse voltage is to reaction circuit, the dutyfactor value of pulse-width modulation circuit output pulse signal is controlled together with reaction circuit, a corresponding flow equalizing circuit of voltage stabilized source, makes the outward current of n power module of voltage regulation be evenly distributed;
Step 5: measured drilling parameter information and formation information data by inserting tube, and carry out coding transmission therein after take off data being processed; Inserting tube is powered by voltage stabilized source;
Step 6: by the take off data of the output voltage of signals collecting circuit sampling three-phase current rectifying and wave filtering circuit, the outward current of n voltage stabilized source, the output voltage of voltage stabilized source and inserting tube coding;
Step 7: judge whether inserting tube uploads efficient coding signal, if not uploading, then continues sampling by the sampling time interval of setting by signals collecting circuit;
Step 8: if efficient coding signal uploaded by inserting tube, then these data are sent in the microprocessor in pilot circuit through signals collecting circuit;
Step 9: by the microprocessor in pilot circuit to signals collecting circuit collection output voltage and take off data process, and export the pulse-width modulation waveform of pulse-width modulation waveform dutycycle in adjustment one-period;
Step 10: the pulse-width modulation waveform being received microprocessor output by driving circuit, and driving pulse signal generator produces pressure pulse, then transfer to standpipe place, ground through drilling fluid mud, show on the computer screen after decoding.
When detecting that voltage and current value are within the scope of secure threshold, also to be judged whether there is self-sustained oscillation in above-mentioned steps 3, if existing, carrying out vibration by the high-power resistance in shock absorbing circuit and eliminating.
Microprocessor in above-mentioned steps 9 processes to output voltage and the take off data of signals collecting circuit collection, and is stored in the memory circuit in pilot circuit, then by the running status of supervisory circuit monitor in real time microprocessor.
In above-mentioned steps 4: n flow equalizing circuit is connected by current equalizing bus bar, adopting maximum current method, taking maximum sampling electric current as benchmark, n-1 flow equalizing circuit regulates respective control voltage.
The Dominant Facies that described intelligent drilling instrument down-hole power implementation method and pulse drive method and intelligent drilling instrument down-hole power and pulsed drive circuit have relative to prior art with, do not repeat them here.
Accompanying drawing explanation
The accompanying drawing of a part forming the invention be used to provide to the invention it is further understood that the schematic description and description of the invention is for explaining the invention, do not form the improper restriction to the invention. In the accompanying drawings:
Fig. 1 is intelligent drilling instrument down-hole power described in the invention embodiment and pulsed drive system architecture figure.
Fig. 2 is intelligent drilling instrument down-hole power described in the invention embodiment and pulsed drive system works flow process figure.
Fig. 3 is the input-output efficiency test curve of intelligent drilling instrument down-hole power described in the invention embodiment and pulsed drive system one embodiment.
Fig. 4 is intelligent drilling instrument down-hole power described in the invention embodiment and the high temperature test curve of pulsed drive system one embodiment.
Embodiment
It should be noted that, when not conflicting, the embodiment in the invention and the feature in embodiment can combine mutually.
Below with reference to the accompanying drawings and come the invention is described in detail in conjunction with the embodiments.
A kind of intelligent drilling instrument down-hole power and pulsed drive circuit, as shown in Figure 1, comprise the mud turbine generator, three-phase current rectifying and wave filtering circuit, voltage stabilizing circuit, inserting tube, signals collecting circuit, pilot circuit and the driving circuit that connect successively,
Described mud turbine generator produces low frequency three-phase alternating current electric energy, for powering for intelligent drilling instrument;
Described three-phase current rectifying and wave filtering circuit, carries out diode full-bridge rectification and electric capacity filtering to the low frequency three-phase alternating current electric energy that mud turbine generator exports, exports thick direct current energy;
Described voltage stabilizing circuit is the parallel-connection structure of n independent voltage stabilized source, voltage stabilized source described in each includes the loop circuit connected and composed successively by inverse-excitation type transformer, half-wave rectification filtering circuit, reaction circuit, pulse-width modulation circuit, the input terminus of described inverse-excitation type transformer connects the output end signal of three-phase current rectifying and wave filtering circuit, converts the thick direct current energy that three-phase current rectifying and wave filtering circuit exports to high frequency AC energy; Described half-wave rectification filtering circuit exports to inserting tube after high frequency AC energy is carried out diode half-wave rectification and electric capacity filtering; The output voltage of reaction circuit sampling half-wave rectification filtering circuit, pulse-width modulation circuit is according to the dutyfactor value of output pulse signal in the sampled value adjustment one-period of reaction circuit, for controlling the energy conversion efficiency of inverse-excitation type transformer, reach the object of stable output voltage; Wherein, n be more than or equal to 1 natural number, by driving, the power size needed for load determines the value of n, it is achieved according to loading demand, thick direct current energy converts stable meticulous direct current energy to;
Described inserting tube is used for measurement and comprises the drilling parameter information such as hole deviation, orientation and resistivity, also has the formation informations such as gamma, carries out coding transmission after take off data is processed by inside;
The input terminus of described signals collecting circuit connects the output end signal of current rectifying and wave filtering circuit, the output end signal of voltage stabilizing circuit and the output end signal of inserting tube; For gathering the take off data of the output voltage of three-phase current rectifying and wave filtering circuit, each outward current of independent voltage stabilized source, the output voltage of voltage stabilized source and inserting tube coding;
Described pilot circuit comprises microprocessor, the output terminal of described microprocessor connection signal Acquisition Circuit, also comprise the memory circuit, supervisory circuit and the computer that are connected with microprocessor, the sampled signal of microprocessor receives signals Acquisition Circuit, after carrying out A/D conversion and calculating, preserve by memory circuit, also produce pulse-width modulation waveform; The running status of monitor circuit monitors microprocessor, when microprocessor work is abnormal, carries out reset by supervisory circuit and operates, by serial communication interface, can realize information interaction between microprocessor and computer;
Described driving circuit also connects the output end signal of three-phase current rectifying and wave filtering circuit, driving circuit is under the control of the pulse-width modulation waveform of pilot circuit, driving pulse signal generator action, transfers to standpipe place, ground by the take off data that inserting tube encodes with the form of pressure wave;
The take off data of described inserting tube coding enters through signals collecting circuit in the microprocessor in pilot circuit, after microprocessor receives effective measurement signal, within the signal effective time period, the dutyfactor value of the output voltage values regulation output pulse waveform when three-phase current rectifying and wave filtering circuit that microprocessor collects according to signals collecting circuit, the thick direct current energy of the wide region that driving circuit is exported by three-phase current rectifying and wave filtering circuit is powered, under the control of pulse-width modulation waveform, driving circuit provides stable driving electric current for pulse signal generator, ensure when the take off data of inserting tube coding arrives, the normal action of the needle-valve of pulse signal generator produces pressure pulse, it is transferred to standpipe place, ground through drilling fluid mud, show on the computer screen after decoding, analysis decision is carried out for ground personnel.
Flow equalizing circuit it is equipped with between voltage stabilized source and inserting tube described in each, described flow equalizing circuit connection signal Acquisition Circuit and reaction circuit, when loading demand power is bigger, single voltage stabilized source can not meet when requiring, the outward current of flow equalizing circuit sampling half-wave rectification filtering circuit, Drazin inverse voltage, to reaction circuit, controls the dutyfactor value of pulse-width modulation circuit output pulse signal together with reaction circuit, and the outward current of n power module of voltage regulation is evenly distributed; By regulating the outward current of n voltage stabilized source, make the outward current equilibrium assignment of the voltage stabilized source of each parallel connection, prevent single voltage stabilized source from burning because power is excessive;
Described flow equalizing circuit 1 to flow equalizing circuit n is connected by current equalizing bus bar, adopt maximum current method, taking maximum sampling electric current as benchmark, n-1 flow equalizing circuit regulates respective control voltage, for flow equalizing circuit 1, flow equalizing circuit 1 is sampled the outward current of voltage stabilized source 1, if the maximum sampling electric current of this current value, then flow equalizing circuit 1 no-output, if this current value is not maximum sampling electric current, then flow equalizing circuit 1 exports control voltage to the reaction circuit in voltage stabilized source 1, the dutyfactor value of pulse-width modulation circuit output pulse waveform is controlled together with feedback voltage, by regulating the energy conversion efficiency of inverse-excitation type transformer, output rating and voltage stabilized source 2 to the voltage stabilized source n of the output voltage control voltage stabilized source 1 of adjustment voltage stabilized source 1 keep in balance.
It is provided with protection circuit between described three-phase current rectifying and wave filtering circuit and voltage stabilizing circuit, described protection circuit comprises voltage protection circuit and current protecting circuit, voltage protection circuit comprises under-voltage protecting circuit and overvoltage protection circuit, the output voltage of voltage protection circuit monitoring three-phase current rectifying and wave filtering circuit, output control signals in the pulse-width modulation circuit in voltage stabilized source 1 to voltage stabilized source n, when the setting threshold value of this magnitude of voltage lower than under-voltage protecting circuit or the setting threshold value higher than overvoltage protection circuit, pulse-width modulation circuit in voltage stabilized source 1 to voltage stabilized source n all stops work, voltage stabilized source output voltage is 0, when this magnitude of voltage is in voltage protection threshold range, the pulse-width modulation circuit normal operation in voltage stabilized source 1 to voltage stabilized source n, voltage stabilized source is according to loading demand stable output direct current energy, the loop current of current protecting circuit monitoring down-hole power and pulsed drive system, output control signals in the pulse-width modulation circuit in voltage stabilized source 1 to voltage stabilized source n, when this current value exceeds the current threshold scope of setting, pulse-width modulation circuit in voltage stabilized source 1 to voltage stabilized source n all stops work, and voltage stabilized source output voltage is 0, when this current value is within the scope of the current threshold set, the equal normal operation of pulse-width modulation circuit in voltage stabilized source 1 to voltage stabilized source n, voltage stabilized source is according to loading demand stable output direct current energy.
It is provided with shock absorbing circuit between described three-phase current rectifying and wave filtering circuit and voltage stabilizing circuit, for eliminating vibration and the step-out of the mud turbine generator that load change causes, stablizing of reduction output voltage fluctuation, maintenance down-hole power and pulsed drive system output voltage; The output voltage of shock absorbing circuit sampling three-phase current rectifying and wave filtering circuit, therefrom extract AC ripple composition, when this AC ripple composition reach setting disappear shake threshold value time, the resistance that shaken by disappearing by this oscillating voltage imports ground terminal, to prevent the normal operation of this self-sustained oscillation impact electrical load.
A kind of intelligent drilling instrument down-hole power implementation method of the invention embodiment and pulse drive method, as shown in Figure 2, comprise following content:
Step 1: produce low frequency three-phase alternating current electric energy by turbo-generator;
Step 2: by three-phase current rectifying and wave filtering circuit, AC energy is carried out diode full-bridge rectification and electric capacity filtering, the low frequency ac that turbo-generator produces can be converted to thick direct current energy;
Step 3: by the output voltage of voltage protection circuit sampling three-phase current rectifying and wave filtering circuit, the loop current of down-hole power system of being sampled by current protecting circuit,
When the output voltage of three-phase current rectifying and wave filtering circuit, when the loop current of down-hole power system is within the scope of secure threshold, the thick direct current energy that three-phase current rectifying and wave filtering circuit exports is converted to high frequency AC energy by inverse-excitation type transformer, by half-wave rectification filtering circuit, high frequency AC energy carried out half-wave rectification and electric capacity filtering again, simultaneously by the output voltage of reaction circuit sampling half-wave rectification filtering circuit, send into pulse-width modulation circuit, the dutyfactor value of pulse signal in one-period is adjusted by pulse-width modulation circuit, to control the energy conversion efficiency of inverse-excitation type transformer, reach the object of stable output voltage,
The loop circuit that wherein inverse-excitation type transformer, half-wave rectification filtering circuit, reaction circuit, pulse-width modulation circuit connect and compose successively forms voltage stabilized source; Wherein when loading demand power is relatively big, single voltage stabilized source can not meet when requiring, adopts the structure of n voltage stabilized source parallel connection;
When detecting that voltage and current value are in outside the threshold range set in advance, the pulse-width modulation circuit in voltage stabilized source stops output pulse signal, inverse-excitation type transformer stopping work, and voltage stabilized source exports without electric energy, intelligent drilling instrument stopping work;
Step 4: when loading demand power is bigger, single voltage stabilized source can not meet when requiring, by the outward current of the half-wave rectification filtering circuit of flow equalizing circuit sampling voltage stabilized source, Drazin inverse voltage is to reaction circuit, the dutyfactor value of pulse-width modulation circuit output pulse signal is controlled together with reaction circuit, a corresponding flow equalizing circuit of voltage stabilized source, makes the outward current of n power module of voltage regulation be evenly distributed;
Step 5: measured drilling parameter information and formation information data by inserting tube, and carry out coding transmission therein after take off data being processed; Inserting tube is powered by voltage stabilized source;
Step 6: by the take off data of the output voltage of signals collecting circuit sampling three-phase current rectifying and wave filtering circuit, the outward current of n voltage stabilized source, the output voltage of voltage stabilized source and inserting tube coding;
Step 7: judge whether inserting tube uploads efficient coding signal, if not uploading, then continues sampling by the sampling time interval of setting by signals collecting circuit;
Step 8: if efficient coding signal uploaded by inserting tube, then these data are sent in the microprocessor in pilot circuit through signals collecting circuit;
Step 9: by the microprocessor in pilot circuit to signals collecting circuit collection output voltage and take off data process, and export the pulse-width modulation waveform of pulse-width modulation waveform dutycycle in adjustment one-period;
Step 10: the pulse-width modulation waveform being received microprocessor output by driving circuit, and driving pulse signal generator produces pressure pulse, then transfer to standpipe place, ground through drilling fluid mud, show on the computer screen after decoding.
Step 11: repeating step 4-10, in intelligent drilling tool work process, is continuously and provides stable direct current energy by electrical load, and upload the take off data of inserting tube coding.
When detecting that voltage and current value are within the scope of secure threshold in above-mentioned steps 3, also to be judged whether if existing because load change exists self-sustained oscillation, to carry out vibration by the high-power resistance in shock absorbing circuit and eliminate.
In above-mentioned steps 4: n flow equalizing circuit is connected by current equalizing bus bar, adopting maximum current method, taking maximum sampling electric current as benchmark, n-1 flow equalizing circuit regulates respective control voltage.
Microprocessor in above-mentioned steps 9 processes to output voltage and the take off data of signals collecting circuit collection, and is stored in the memory circuit in pilot circuit, then by the running status of supervisory circuit monitor in real time microprocessor.
It is illustrated in figure 3 the input-output efficiency test curve of one embodiment of the invention, test conditions is: the input termination three-phase alternating current source of three-phase current rectifying and wave filtering circuit, input-output efficiency test during simulation mud turbine generator 1 rotation speed change scope 2500rpm��5500rpm, design output voltage 37 �� 1V, inserting tube place constant-current type electronic load replaces, curent change scope is 0A��3A, the take off data of inserting tube coding is simulated by signal generator, signal generator is set to square-wave pulse, frequency 0.1Hz, pulse amplitude 5V, dutycycle 10%, the output termination pulse signal generator of driving circuit, 2500rpm��5500rpm output voltage curve is as shown in Fig. 3 (a), 2500rpm��5500rpm input-output efficiency curve is as shown in Fig. 3 (b), for input-output curve under differentiation different rotating speeds, ordinate zou is offset in units of 10%. wherein test data during 5500rpm is as shown in table 3-1.
Table 3-15500rpm input-output efficiency test
In Fig. 3 (a), along with the increase of load current, load voltage reduces gradually, and its variation range is within design requirements; In Fig. 3 (b), along with the increase of load current, the input-output efficiency of down-hole power and pulsed drive system maintains about 80%, meets the requirement of intelligent drilling instrument borehole operation.
It is illustrated in figure 4 the high temperature test curve of one embodiment of the invention, test conditions is: the input termination three-phase alternating current source of three-phase current rectifying and wave filtering circuit, input-output efficiency test during simulation mud turbine generator 1 rotating speed 4000rpm, inserting tube place constant-current type electronic load replaces, current value is set as 2A, temperature test scope is 100 DEG C��130 DEG C, table 4-1 is high temperature test data, the high temperature test input characteristic curve of Fig. 4 (a) for drawing by table 4-1, the high temperature test output characteristic curve of Fig. 4 (b) for drawing by table 4-1, the high temperature test input-output efficiency curve of Fig. 4 (c) for drawing by table 4-1.
Table 4-1 down-hole power and pulsed drive system high temperature testing experiment
In Fig. 4 (a), along with temperature raises, received current increases to 0.766A from 0.729A, and input voltage keeps constant substantially; In Fig. 4 (b), along with temperature raises, load voltage rises to 37.77V from 36.86V, and load current keeps constant; In Fig. 4 (c), along with temperature raises, the input-output efficiency of down-hole power and pulsed drive system slightly promotes, and maintains about 78%, meets the demand of intelligent drilling instrument underground work.
During work, the low frequency three-phase alternating current electric energy that mud turbine generator 1 produces exports thick direct current energy carry out full-wave rectification and electric capacity filtering through three-phase current rectifying and wave filtering circuit after, thick direct current energy is carried out electric energy conversion by voltage stabilized source, flow equalizing circuit is adopted to carry out load balancing, the direct current energy of stable output is supplied to inserting tube, the voltage of down-hole power system and electric current are protected by protection circuit, wherein, the threshold value of under-voltage protecting circuit is set to 40V, the threshold value of overvoltage protection circuit is set to 160V, the threshold value of current foldback circuit is set to 8A, shock absorbing circuit is for eliminating step-out and the vibration phenomenon of the generator that load change causes, ensure to export the stability of electric energy, the voltage of power-supply system key node under signals collecting circuit production wells, the coded signal that electric current signal and inserting tube are uploaded is sent in pilot circuit, pilot circuit is analyzed to the received signal, store after process, and the coded signal uploaded according to inserting tube exports to driving circuit by microprocessor generation pulse-width modulation waveform, by driving circuit setting pulse signal generator action when coded signal arrives, produce mud-pulse pressure wave, standpipe place, ground is uploaded to through drilling fluid mud, show on the computer screen after decoding, analysis decision is carried out for ground personnel.
The invention is by producing efficiency of conversion and the allocative decision of the pulse signal control electric energy of a series of different duty value, thus be provide suitable, stable, safe direct current energy by electrical load, it is to increase the stability of intelligent drilling instrument underground work, security and work-ing life.
The technical scheme of the invention is not only confined to field of oil drilling, in the present invention the structure of each integral part and mode of connection can overall or certain applications in the power system design of AC-DC converter, it is possible to be applied in the driving design to perception load.
The foregoing is only the better embodiment of the invention; not in order to limit the invention; within all spirit in the invention and principle, any amendment of doing, equivalent replacement, improvement etc., all should be included within the protection domain of the invention.
Claims (8)
1. intelligent drilling instrument down-hole power and pulsed drive circuit, it is characterised in that: comprise the mud turbine generator, three-phase current rectifying and wave filtering circuit, voltage stabilizing circuit, inserting tube, signals collecting circuit, pilot circuit and the driving circuit that connect successively,
Described voltage stabilizing circuit is the parallel-connection structure of n independent voltage stabilized source, voltage stabilized source described in each includes the loop circuit connected and composed successively by inverse-excitation type transformer, half-wave rectification filtering circuit, reaction circuit, pulse-width modulation circuit, the input terminus of described inverse-excitation type transformer connects three-phase current rectifying and wave filtering circuit, and the output terminal of described half-wave rectification filtering circuit connects inserting tube; Wherein, n be more than or equal to 1 natural number;
The output end signal of the input terminus connection current rectifying and wave filtering circuit of described signals collecting circuit, the output end signal of voltage stabilizing circuit, the output end signal of inserting tube;
Described pilot circuit comprises microprocessor, the output terminal of described microprocessor connection signal Acquisition Circuit;
Described driving circuit also connects the output end signal of three-phase current rectifying and wave filtering circuit.
2. intelligent drilling instrument down-hole power according to claim 1 and pulsed drive circuit; it is characterized in that: between described three-phase current rectifying and wave filtering circuit and the pulse-width modulation circuit of voltage stabilizing circuit, be provided with protection circuit; described protection circuit comprises voltage protection circuit and current protecting circuit, and voltage protection circuit comprises under-voltage protecting circuit and overvoltage protection circuit.
3. intelligent drilling instrument down-hole power according to claim 1 and pulsed drive circuit, it is characterised in that: it is equipped with flow equalizing circuit between half-wave rectification filtering circuit and inserting tube described in each, described flow equalizing circuit connection signal Acquisition Circuit and reaction circuit.
4. intelligent drilling instrument down-hole power according to claim 1 and pulsed drive circuit, it is characterized in that: between described three-phase current rectifying and wave filtering circuit and voltage stabilizing circuit, be provided with shock absorbing circuit, shock absorbing circuit the oscillating voltage of sampling can be shaken by disappearing resistance import ground terminal.
5. an intelligent drilling instrument down-hole power implementation method and pulse drive method, it is characterised in that comprise following content:
Step 1: produce low frequency three-phase alternating current electric energy by turbo-generator;
Step 2: AC energy is carried out rectifying and wave-filtering by three-phase current rectifying and wave filtering circuit;
Step 3: by the output voltage of voltage protection circuit sampling three-phase current rectifying and wave filtering circuit, the loop current of down-hole power system of being sampled by current protecting circuit,
When the output voltage of three-phase current rectifying and wave filtering circuit, when the loop current of down-hole power system is within the scope of secure threshold, the thick direct current energy that three-phase current rectifying and wave filtering circuit exports is converted to high frequency AC energy by inverse-excitation type transformer, by half-wave rectification filtering circuit, high frequency AC energy carried out half-wave rectification and electric capacity filtering again, simultaneously by the output voltage of reaction circuit sampling half-wave rectification filtering circuit, send into pulse-width modulation circuit, the dutyfactor value of pulse signal in one-period is adjusted by pulse-width modulation circuit, to control the energy conversion efficiency of inverse-excitation type transformer, wherein inverse-excitation type transformer, half-wave rectification filtering circuit, reaction circuit, the loop circuit that pulse-width modulation circuit connects and composes successively forms voltage stabilized source, wherein when loading demand power is relatively big, single voltage stabilized source can not meet when requiring, adopts the structure of n voltage stabilized source parallel connection,
When detecting that voltage and current value are in outside the threshold range set in advance, the pulse-width modulation circuit in voltage stabilized source stops output pulse signal, inverse-excitation type transformer stopping work, and voltage stabilized source exports without electric energy;
Step 4: when loading demand power is bigger, single voltage stabilized source can not meet when requiring, by the outward current of the half-wave rectification filtering circuit of flow equalizing circuit sampling voltage stabilized source, Drazin inverse voltage is to reaction circuit, the dutyfactor value of pulse-width modulation circuit output pulse signal is controlled together with reaction circuit, a corresponding flow equalizing circuit of voltage stabilized source, makes the outward current of n power module of voltage regulation be evenly distributed;
Step 5: measured drilling parameter information and formation information data by inserting tube, and carry out coding transmission therein after take off data being processed; Inserting tube is powered by voltage stabilized source;
Step 6: by the take off data of the output voltage of signals collecting circuit sampling three-phase current rectifying and wave filtering circuit, the outward current of n voltage stabilized source, the output voltage of voltage stabilized source and inserting tube coding;
Step 7: judge whether inserting tube uploads efficient coding signal, if not uploading, then continues sampling by the sampling time interval of setting by signals collecting circuit;
Step 8: if efficient coding signal uploaded by inserting tube, then these data are sent in the microprocessor in pilot circuit through signals collecting circuit;
Step 9: by the microprocessor in pilot circuit to signals collecting circuit collection output voltage and take off data process, and export the pulse-width modulation waveform of pulse-width modulation waveform dutycycle in adjustment one-period;
Step 10: the pulse-width modulation waveform being received microprocessor output by driving circuit, and driving pulse signal generator produces pressure pulse, then transfer to standpipe place, ground through drilling fluid mud, show on the computer screen after decoding.
6. intelligent drilling instrument down-hole power implementation method according to claim 5 and pulse drive method, it is characterized in that: when detecting that voltage and current value are within the scope of secure threshold in step 3, also to be judged whether there is self-sustained oscillation, if existing, carrying out vibration by the high-power resistance in shock absorbing circuit and eliminating.
7. intelligent drilling instrument down-hole power implementation method according to claim 5 and pulse drive method, it is characterized in that: the microprocessor in step 9 processes to output voltage and the take off data of signals collecting circuit collection, and be stored in the memory circuit in pilot circuit, then by the running status of supervisory circuit monitor in real time microprocessor.
8. intelligent drilling instrument down-hole power implementation method according to claim 5 and pulse drive method, it is characterized in that: in step 4: n flow equalizing circuit is connected by current equalizing bus bar, adopt maximum current method, taking maximum sampling electric current as benchmark, n-1 flow equalizing circuit regulates respective control voltage.
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