CN111852418B - High-efficient ultrasonic wave oil reservoir processing system - Google Patents
High-efficient ultrasonic wave oil reservoir processing system Download PDFInfo
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- CN111852418B CN111852418B CN202010528866.5A CN202010528866A CN111852418B CN 111852418 B CN111852418 B CN 111852418B CN 202010528866 A CN202010528866 A CN 202010528866A CN 111852418 B CN111852418 B CN 111852418B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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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
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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Abstract
The invention relates to a high-efficiency ultrasonic oil layer processing system in the technical field of oil exploitation, which comprises a ground system, a special cable and an underground system, wherein the ground system comprises a direct current conversion cabinet and a magnetic positioning controller which are alternately switched and connected through a conversion switch, the other end of the conversion switch is sequentially connected with a sliding ring and a cable drum, the special cable is wound on the cable drum and is conveyed to the underground to be connected with the underground system, and the underground system sequentially comprises a horse head, a magnetic positioning controller, an underground power inverter system and an energy converter; the direct current conversion cabinet converts alternating current into high-voltage direct current and transmits the high-voltage direct current to a power inverter system underground through a special cable; the power inverter system converts high-voltage direct current into high-frequency alternating current pulse power to supply to an underground transducer, and the transducer generates high-power ultrasonic waves through electro-acoustic conversion for oil layer blockage removal. The system of the invention adopts a direct current transmission power supply, reduces reactive loss, improves the system efficiency and further improves the capacity of ultrasonic blockage removal treatment of oil layers.
Description
Technical Field
The invention relates to underground ultrasonic blockage removal construction operation in the technical field of oil exploitation, in particular to a high-efficiency ultrasonic oil layer treatment system.
Background
Near-wellbore contamination has become a common problem in the middle and late stages of oilfield development. The ultrasonic blockage removing technology is used as a low-cost physical yield increasing technology, has the characteristics of high effective rate of measures, simple process, short construction period, low cost, quick response, obvious yield increasing effect, no secondary pollution to an oil layer and the like, and well makes up the defects of measures such as fracturing, acidizing and the like.
The principle of the ultrasonic blockage removing and oil increasing technology is that a pulse modulation sine wave high-voltage signal with the frequency of 20-30 kHZ is generated by an ultrasonic power supply and transmitted to an underground ultrasonic transducer through a cable winch and a cable, the transducer continuously emits ultrasonic waves aiming at an oil layer in an oil well, and stratum pollution and blockage are removed by using the mechanical, cavitation, heat, acoustic flow and other effects of the ultrasonic waves, so that a blockage is loosened and falls off, an oil flow channel is dredged, the permeability of a near-well stratum is improved, and the aims of increasing the yield of crude oil, reducing water content and improving the recovery ratio of the crude oil are fulfilled.
The existing ultrasonic oil increasing technical equipment mainly comprises a ground ultrasonic control power source, a special transmission cable and an underground transducer. The ground ultrasonic control device is powered by a power transformer through a power cable, outputs pulse frequency signals, and is connected to the underground ultrasonic transducer through a cable winch by a special ultrasonic armored cable. For example, in the prior art, the utility model patent number is ZL201410202499, a device for increasing oil in an oil field, and the patent number is ZL2017206677452, a high-power ultrasonic oil layer treatment system.
The prior art has the problems that: 1) the ground ultrasonic power supply is an AC-DC-AC system, and in order to meet the requirements of the transducer, the output AC voltage must be boosted, and the high-frequency transformer has complex technology and high cost; 2) the special transmission cable transmits high-frequency signals, so that the line loss is high, the transmission efficiency is low, the power input to the transducer is limited, and the conversion efficiency is influenced; 3) due to the problem of line loss of alternating-current high-frequency long-distance transmission, the underground operation depth is limited; 4) due to the influence of cable reactance, the transducer has high difficulty in resonant matching, and a special matcher needs to be equipped underground; 5) The output transmission distance of the high-frequency alternating-current power supply is long, the design difficulty of a control protection circuit is high, and a certain deviation exists in a detection signal; 6) the underground secondary ultrasonic vibrator is equipped, so that the equipment cost is high and the construction process is complex.
Disclosure of Invention
Aiming at the problems of high line loss, high line cost and high technical difficulty in underground high-frequency alternating current transmission in the prior art, the invention provides the high-efficiency ultrasonic oil layer treatment system for changing underground high-frequency alternating current transmission into high-voltage direct current transmission, so that a power supply is transmitted underground by direct current, the reactive loss is reduced, the system efficiency is improved, and the oil layer ultrasonic treatment capacity is further improved.
The invention aims to realize the purpose, and the high-efficiency ultrasonic oil layer treatment system comprises a ground system, a special cable and an underground system, wherein the ground system comprises a direct current conversion cabinet and a magnetic positioning controller which are alternately switched and connected through a conversion switch, the other end of the conversion switch is sequentially connected with a slip ring and a cable drum, the special cable is wound on the cable drum and is conveyed to the underground to be connected with the underground system, and the underground system sequentially comprises a horse head, a magnetic positioning device, an underground power inversion system and an energy converter; the direct current conversion cabinet converts alternating current into high-voltage direct current and transmits the high-voltage direct current to a power inverter system underground through a special cable; the power inverter system converts high-voltage direct current into high-frequency alternating current pulse power to supply to an underground transducer, and the transducer generates high-power ultrasonic waves through electro-acoustic conversion to be used for oil layer blockage removal.
The high-efficiency ultrasonic oil layer treatment system changes the prior alternating current transmission design, utilizes the characteristics of direct current transmission, converts alternating current into required high-voltage direct current by a ground system, transmits the direct current to the underground with low loss through a special cable, and realizes the inversion function in the underground. The underground power inverter system can output 17-30 kHZ high-voltage pulse alternating current to the underground transducer without using a step-up transformer, so that the input power of the transducer is improved, the resonance matching of the transducer is facilitated, and the electro-acoustic conversion efficiency of the transducer is improved; the communication system is used for controlling the transmission of the detection signal in real time, so that the running quality of the system is improved; the integral system has a simple external structure and is convenient for field construction operation.
In order to facilitate converting alternating current into high-voltage direct current on a well, the direct current conversion cabinet comprises a ground main control circuit, a direct current conversion power supply, a ground communication circuit, a touch display screen, a master control switch, a soft start circuit, a boosting transformer and a rectification filter circuit which are sequentially connected, the high-voltage direct current output by the rectification filter circuit is connected to a special cable through a slip ring and a cable reel and is conveyed to an underground system, the direct current conversion power supply is used for converting the alternating current into low-voltage direct current which is respectively supplied to the touch display screen, the ground main control circuit and the ground communication circuit, and the ground main control circuit is used for data processing and detection of the direct current conversion cabinet and exchanging data with the ground communication circuit and the touch display screen. The invention generates required direct current output by boosting the voltage of an input power supply through a boosting transformer and rectifying and filtering through a rectifying and filtering circuit, and transmits the direct current output to an underground power inverter system through an ultrasonic special cable.
In order to protect an input circuit and reduce the start-stop current of a system, a soft start circuit is designed, and in order to facilitate operation, a start switch and a stop switch for starting and stopping are arranged on the soft start circuit.
In order to facilitate the on-pit control of the on-pit system to start and stop, a start-stop button for controlling the on-pit system to start and stop is further arranged on the direct current conversion cabinet.
To facilitate the transmission of power and signals, the dedicated cable includes a power transmission cable for transmitting high voltage direct current and four communication cables for uphole and downhole data transmission.
In order to facilitate the design of the underground circuit, the underground power inverter system comprises a soft-start switch circuit, a power inverter circuit, a single chip microcomputer control circuit, a CPLD preset circuit, a PWM circuit, a driving protection circuit, a detection circuit, a frequency tracking circuit, an underground communication circuit and a direct current conversion circuit. According to the underground power inverter system, no long-distance transmission cable is arranged from the alternating current inverter system to the energy converter, reactive loss of the system is reduced, the fault rate of the system is reduced, and the design of an internal control protection circuit is simplified.
In order to facilitate the inversion conversion from the high-voltage direct current to the high-frequency alternating current pulse power, the direct conversion circuit is used for supplying the low-voltage direct current to each control circuit in the well; the power inverter circuit comprises a first IGBT tube, a second IGBT tube, a third IGBT tube and a fourth IGBT tube which are in bridge connection; the singlechip control circuit is used for storing and controlling the underground power inverter circuit to work in a program mode; the CPLD presetting circuit is used for presetting and executing a self-checking instruction and transmitting a pulse driving signal according to a program instruction of the singlechip control circuit; the PWM circuit is used for pulse width modulation; the driving protection circuit is used for self-checking protection of high voltage, low voltage, temperature and current of the power inverter circuit, and comprises an HML integrated block, an isolation grating U5, a NOT gate U4 and a NAND gate U5; the frequency tracking circuit comprises a phase-locked loop circuit U8, an operational amplifier U7-1, an operational amplifier U7-2 and a voltage division circuit; the output signal of the phase-locked loop circuit U8 is in signal connection with the singlechip control circuit; the detection circuit is used for detecting the starting state and the running state of the underground system, carrying out signal transmission with the ground communication circuit through the underground communication circuit and displaying the output state on the touch display screen 17; and the underground communication circuit is in signal connection with the ground communication circuit and displays the working state through the touch display screen.
Further, the dc voltages output by the dc conversion circuit are 24V, 12V, 5V, and 3V, respectively.
Furthermore, the touch display screen comprises a left touch start-stop button, a power display and adjustment button, a frequency display and adjustment button, a duty ratio display and adjustment button, a right management control display area, a fault display area, an input state display area, a direct current state display area and an output state display area.
Drawings
Fig. 1 is a schematic view of the installation arrangement of the high-efficiency ultrasonic reservoir treatment system of the present invention.
Fig. 2 is a schematic diagram of a high efficiency ultrasonic reservoir treatment system of the present invention.
FIG. 3 is a schematic diagram of a control circuit for the downhole system.
Fig. 4 is a screen layout diagram of the touch display screen.
Fig. 5 is a flow chart of the operation of the high efficiency ultrasonic reservoir treatment system of the present invention.
Wherein, 1, a direct current control cabinet; 2, magnetically positioning a controller; 3, a change-over switch; 4, a slip ring; 5, cable reel; 6 special cables, 7 blowout preventers, 8 casings, 9 headsets, 10 magnetic positioners, 11 power inverter systems, 12 transducers, 13 master control switches, 14 step-up transformers, 15 rectifier filter circuits, 16 soft start circuits, 16A start switches, 16B stop switches, 17 touch display screens, 18 direct current conversion power supplies, 19 ground master control circuits, 20 start-stop buttons, 21 ground communication circuits, 22 underground communication circuits, 23 power inverter circuits, 24 PWM circuits, 25 CPLD preset circuits, 26 detection circuits, 27 direct current conversion circuits, 28 frequency tracking circuits, 29 drive protection circuits, 30 single chip microcomputer control circuits, 31 soft start switch circuits, 32 touch start-stop buttons, 33 power display and adjustment buttons, 34 frequency display and adjustment buttons, 35 duty ratio display and adjustment buttons, 36 management control displays, 37 fault displays, 38 input state displays, 39 dc status display, 40 output status display.
Detailed Description
As shown in fig. 1-4, the high-efficiency ultrasonic oil layer treatment system of the present invention comprises a ground system, a special cable and a downhole system, wherein the ground system comprises a dc conversion cabinet 1 and a magnetic positioning controller 2 alternately switched and connected through a transfer switch 3, the other end of the transfer switch 3 is sequentially connected with a slip ring 4 and a cable reel 5, the cable reel 5 is wound with the special cable 6, the special cable 6 comprises a plurality of signal cables for signal transmission and power cable number transmission on the well and downhole, the signal cables and the power cable number transmission are transmitted to the well and connected with the downhole system, the well head is provided with a well sealer for sealing the opening of a casing 8 in the well, and the special cable 6 extends downwards in the casing 8 through the well head to the downhole system of a working oil layer and sequentially comprises a horse head 9, a magnetic positioner 10, a downhole inversion power system 11 and an energy converter 12; the direct current conversion cabinet 1 converts alternating current into high-voltage direct current and transmits the high-voltage direct current to a power inverter system 11 underground through a special cable 6; the power inverter system 11 converts high-voltage direct current into high-frequency alternating current pulse power to be supplied to the underground transducer 12, and the transducer 12 generates high-power ultrasonic waves through electro-acoustic conversion to be used for oil layer blockage removal.
As shown in the left side of fig. 2, in this embodiment, in order to convert ac power into high-voltage dc power on the well, the dc conversion cabinet 1 includes a ground main control circuit 19, a dc conversion power supply 18, a ground communication circuit 21, a touch display screen 17, and a main control switch 13 and a soft start circuit 16 connected in sequence from the ac power supply, the high-voltage direct current output by the rectifying and filtering circuit 15 is connected to a special cable 6 through a slip ring 4 and a cable reel 5 and is transmitted to an underground system, the direct current conversion power supply 18 is used for converting alternating current into 24V, 12V and 5V low-voltage direct current and respectively supplying the direct current to control circuits such as a touch display screen 17, a ground main control circuit 19 and a ground communication circuit 21, and the ground main control circuit 19 is used for data processing and detection of the direct current conversion cabinet 1 and exchanging data with the ground communication circuit 21 and the touch display screen 17. According to the invention, after an alternating current power supply input into the direct current control cabinet 1 is boosted and rectified, the voltage can be boosted to 1500V direct current, and the direct current can be transmitted to the underground power inverter system through the ultrasonic special cable.
For practical operation, the soft start circuit 16 is provided with a start switch 16A and a stop switch 16B for starting and stopping, and is used for switching on and off the circuit.
In order to facilitate the on-ground control of the start and stop of the underground system, the direct current conversion cabinet 1 is further provided with a start and stop button 20 for controlling the start and stop of the underground system.
To facilitate the transmission of power and signals, the dedicated cable 6 of the present embodiment includes one power transmission cable for transmitting high-voltage direct current and four signal cables for data transmission on and under the well.
As shown in the right side of fig. 2, the downhole power inverter system 11 of the present embodiment includes a soft-start switch circuit 31, a power inverter circuit 23, a single-chip microcomputer control circuit 30, a CPLD preset circuit 25, a PWM circuit 24, a drive protection circuit 29, a detection circuit 26, a frequency tracking circuit 28, a downhole communication circuit 22, and a dc conversion circuit 27. The underground power inverter system of the invention has no long-distance transmission cable from the alternating current inverter system to the energy converter 12, thereby reducing the reactive loss of the system, reducing the failure rate of the system, simplifying the internal control and protecting the circuit design.
As shown in fig. 2 and 3, in order to facilitate the inversion conversion from the downhole high-voltage direct current to the high-frequency alternating current pulse power, the direct conversion circuit 27 converts the alternating current pulse power into 24V, 12V, 5V and 3V low-voltage direct current respectively for supplying to the downhole control circuits and the downhole communication circuit 21, and the downhole control circuits have low-voltage direct current respectively; the power inverter circuit 23 comprises a first IGBT tube, a second IGBT tube, a third IGBT tube and a fourth IGBT tube which are in bridge connection; the singlechip control circuit 30 is used for storing and controlling the work of the underground power inverter circuit by a program; the CPLD presetting circuit 25 is used for presetting and executing a self-checking instruction, and transmitting a pulse driving signal according to a program instruction of the single chip microcomputer control circuit 30; the PWM circuit 24 is for pulse width modulation; the driving protection circuit 29 is used for self-checking protection of high voltage, low voltage, temperature and current of the power inverter circuit, and comprises an HML integrated block, an isolation grating U5, a NOT gate U4 and a NOT gate U5; the frequency tracking circuit 28 comprises a phase-locked loop circuit U8, an operational amplifier U7-1, an operational amplifier U7-2 and a voltage division circuit; the output signal of the phase-locked loop circuit U8 is in signal connection with the singlechip control circuit 30; the detection circuit 26 is used for detecting the state and the operation state when the system is started, and performs signal transmission with the ground communication circuit 21 through the downhole communication circuit 22, and displays the output state on the touch display screen 17.
The touch display screen 17 of the present embodiment includes a left touch start-stop button 32, a power display and adjustment button 33, a frequency display and adjustment button 34, a duty display and adjustment button 35, a right management control display area 36, a failure display area 37, an input state display area 38, a dc state display area 39, and an output state display area 40. Wherein, touching the start-stop button 32: the power inverter system 11 for starting and stopping the underground is processed by a ground main control circuit 19, then transmitted to a switch circuit of a singlechip control circuit 30 by a ground communication circuit 21 and an underground communication circuit 22, and is started once by touching and stopped once again; power display and adjustment button 33: displaying and setting the output power and the actual power of the power inverter system 11, and setting the power and adjusting the power according to the requirements; frequency display and adjustment button 33: displaying the set working frequency and actual value of the power inverter system 11, and adjusting the frequency within a certain range according to the requirement; duty ratio display and adjustment button 35: displaying and setting an output duty ratio and an actual value of the underground power inverter system 11, and adjusting the duty ratio within a certain range according to requirements;
management monitor display 36: displaying the working time, the working times and the working duration, and entering an upgrade maintenance interface;
failure display 37: the system works normally, display and indicate the green light, indicate the red light in trouble, the pilot signal includes communication, over-temperature, overflowing, overvoltage, undervoltage and lack of phase to point out;
input status display 38: displaying input voltage, current and power;
direct current status display 39: displaying the direct-current voltage, the current and the power input by the power inverter system 11;
output status display 40: the output voltage and current of the power inverter system 1 are shown.
The high-efficiency ultrasonic oil layer processing system of the invention has the following construction process in the oil extraction field:
1) the special cable 6 and the bridle 9 are installed and connected on the ground, sealing is completed, insulation is detected normally by a remote meter, a magnetic positioner 10, a power inverter system 11 and a transducer 12 are sequentially connected behind the bridle 9, the bridle 7 is penetrated after the electrification inspection performance is normal, and a constructor controls the running speed of the cable reel 5 and puts down the whole set of well descending device along the sleeve 8. At the moment, the magnetic positioning controller 2 is connected to a slip ring 4 through a change-over switch 3 and then connected to an underground magnetic positioner 10 through a special cable 6 on a cable tray 5, and a magnetic positioning system is ready to work;
2) turning on a magnetic positioning control power supply, determining a target layer needing ultrasonic treatment in the process of lowering the underground device, and recording a calibration position; sequentially searching and positioning all the target layers, and making records until the completion is finished;
3) after positioning is finished, a power supply of the magnetic positioning controller 2 is turned off, the change-over switch 3 is switched and connected to the direct current conversion cabinet 1, and an output high-voltage direct current power supply is connected to the slip ring 4 through the change-over switch 3 and is sent to the power inversion system 11 through the special cable 6 on the cable drum 5 and the horse head 9 and the magnetic positioner 10;
4) when the system on the well starts working, the master control switch 13 is closed, the power supply is switched on, the touch display screen 17 and the control direct current power supply 18 and other related circuits start self-checking when power is obtained, the self-checking is finished, the soft start circuit 16 works, high-voltage direct current is output through the step-up transformer 14 and the rectifying and filtering circuit 15, and the high-voltage direct current is transmitted to the equipment under the well through the special cable 6;
5) because the working voltages of the magnetic positioner 10 and the transducer 12 are different greatly, the voltage of the latter is far higher than that of the former, in order to ensure that the magnetic positioner 10 is not damaged, a special quick fusing mechanism is designed in the magnetic positioner 10, and the magnetic positioner 10 is quickly fused at high voltage to ensure that the magnetic positioner 10 is not damaged;
6) the direct current conversion circuit 27 in the power inverter system 11 works after being electrified, different working voltages are output and supplied to the internal circuit of the power inverter system 11 for use, and the communication system and the related control circuit start self-checking; after the ground display touch screen 17 displays that each path is normal, a touch start-stop button 32 in the touch display screen 17 is clicked, the system starts to work, a power inverter system 11 converts high-voltage direct current transmitted by a special cable 6 into high-frequency pulse voltage under the action of each underground control circuit and transmits the high-frequency pulse voltage to an energy converter 12, and the energy converter 12 generates high-power ultrasonic waves through electro-acoustic conversion and sends the high-power ultrasonic waves into an operation oil layer to start ultrasonic operation;
7) and after finishing one layer, turning off the power supply of the ultrasonic system, stopping the underground system, lifting the equipment, and sequentially performing ultrasonic blockage removal operation on the previously determined layer by using the recorded magnetic positioning data until all layer ultrasonic operation is finished.
The work flow of the direct current conversion cabinet 1 is as follows: referring to fig. 2 and fig. 3, when the master control switch 13 is turned on, the 380V power supply is turned on, and the input end of the soft start circuit 16 obtains 380VAc alternating current for waiting; the direct current conversion power supply 18 inputs 220VAc alternating current, converts the alternating current into several circuits of different direct currents such as 24V, 12V, 5V and the like, and provides the direct current to the soft start circuit 16, the touch display screen 17, the ground main control circuit 19 and the ground communication circuit 21; after each circuit is powered on, the ground main control circuit 19 sends out a self-checking instruction to start self-checking, the touch display screen 17 displays that the self-checking is normal, the starting switch 16A of the soft starting circuit 16 is pressed, the soft starting circuit 16 works, the output voltage is stably increased, the output voltage is increased according to the designed transformation ratio relation through the step-up transformer 14, the alternating current is converted into the direct current through the rectifying and filtering circuit 15, the corresponding direct current voltage is also stably increased, the finally output direct current voltage can reach 1500V at most, and the output power is 50 Kw. The ground main control circuit 19 always detects the system in the working process, the detection result is displayed on the touch display screen 17, the ground system works normally, an indicating green light is displayed, and a red light is indicated in case of failure; if a fault is displayed, a power-off check is needed, the stop switch 16B of the soft start circuit 16 is firstly pressed for checking, and the master control switch 13 is further turned off for checking if needed.
The start-stop button 20 of the start-stop power inverter system 11 circuit system installed on the panel of the direct current conversion cabinet 1 is directly connected to the switch circuit of the singlechip control circuit 30 through a pair of signal lines in the special cable 6, and can be started once and stopped once again, and can respectively control the start-stop power inverter system 11 with the touch start-stop button 32 on the touch display screen 17, so as to play the roles of quick start-stop and diagnosis detection.
The power inverter system 11 of the present embodiment has the following working procedures: referring to fig. 4 and 5, in the downhole control flow chart, when the dc conversion circuit 27 is powered on, it outputs several circuits of dc power, such as 24V, 12V, 5V, and 3V, to the downhole communication circuit 22 and each control circuit in the power inverter system 11, and the downhole system starts self-checking; when the communication indicator lamp of the ground touch display screen 17 and other states are displayed normally, the touch start-stop button 32 on the touch display screen 17 is clicked, the touch start-stop button is transmitted to the singlechip control circuit 30 in real time through the communication system, the CPLD preset circuit 25 is started according to a program, and the initial setting state is automatically entered; the soft start switch circuit 31 and the PWM circuit 24 start to operate under program control, and drive the power inverter circuit 23 through the drive protection circuit 29, so as to convert the high-voltage dc power into high-frequency pulse ac power for output. Because the soft switch circuit 31 is used, the output voltage amplitude gradually and stably rises in the starting process; in the starting operation process, the detection circuit 26 detects the system operation state, the frequency tracking circuit 28 detects the output frequency and the phase of the power inverter circuit 23, and the frequency is automatically adjusted to work under the set frequency; the underground communication circuit transmits the underground monitored working condition to the ground in real time and displays the working condition on the display touch screen 17. When the detection circuit 26 detects a fault, the fault is sent to the singlechip control circuit 30 to automatically stop working, and meanwhile, the fault state is sent to the touch display screen 17 through the communication system to be displayed.
In the driving protection process, as shown in fig. 5, the pulse width modulation signal PWM generated by the single chip microcomputer control circuit 30 is divided into 4 paths of driving signals PWM1-4 through the CPLD circuit 25, and the 4 circuits in the driving protection circuit 29 are respectively controlled to correspondingly drive the 4 IGBTs in the power inverter circuit 23; after the power is switched on, the driving protection circuit 29 firstly detects whether the IGBT is overloaded or short-circuited by self-detection, if the IGBT is overloaded or short-circuited, the collector potential of the IGBT rises, the current flowing into the detection circuit through the diode D1 increases, the pin 8 of the special module HML outputs a low-level "overload/short-circuit" indication signal, the photoelectric coupling interface circuit U6 outputs a high level, and the output of the nand gate U5 is locked after the reverse direction of the not gate U4. And meanwhile, the grid turn-off circuit acts to cut off the grid driving signal of the IGBT.
The frequency tracking circuit 29 works: the transducer 12 outputs maximum power at resonance, and as environmental factors such as temperature change, the equivalent capacitance and resistance change, and thus the resonance frequency changes. Referring to fig. 4, the frequency tracking circuit 28 detects the output voltage and current signals of the power inverter circuit 23, the current signal is sent to U7-1, the voltage signal is sent to U7-2, after being stably amplified, the voltage signal is sent to the phase-locked loop circuit U8, the frequency is tracked and locked, the output signal is sent to the single-chip microcomputer control circuit 30, and the output resonant frequency is locked under the action of a program.
The touch display screen 17 is provided with a secondary password protection function, and the touch power, frequency and duty ratio adjusting buttons enter primary passwords for an operator to modify construction operation parameters; and touching the working time button to enter a secondary password for maintenance and management personnel to use, thereby providing system upgrading and quality monitoring management. And automatically entering a protection state within 3 minutes after the parameters are set, stopping parameter modification and needing to modify and input the password again.
Under normal conditions, the ultrasonic oil layer processing device can complete ultrasonic blockage removal operation of all required layers once when the ultrasonic oil layer processing device is put into a well.
Therefore, the efficient ultrasonic oil layer treatment system adopts direct current to transmit energy, reduces reactive loss, increases output power, improves the conversion efficiency of the transducer and further improves the oil layer ultrasonic treatment capacity. The method has good economic benefit in the aspects of controlling the yield-increasing cost and improving the input-output ratio, and has wide application prospect.
Claims (6)
1. A high-efficiency ultrasonic oil layer processing system comprises a ground system, a special cable and a downhole system, and is characterized in that the ground system comprises a direct current conversion cabinet and a magnetic positioning controller which are alternately switched and connected through a conversion switch, the other end of the conversion switch is sequentially connected with a slip ring and a cable drum, the special cable is wound on the cable drum, the special cable is conveyed to the downhole and is connected with the downhole system, and the downhole system sequentially comprises a horse head, a magnetic positioner, a downhole power inverter system and an energy converter; the direct current conversion cabinet converts alternating current into high-voltage direct current and transmits the high-voltage direct current to a power inverter system underground through a special cable; the power inverter system converts high-voltage direct current into high-frequency alternating current pulse power to supply to an underground transducer, and the transducer generates high-power ultrasonic waves through electro-acoustic conversion for oil layer blockage removal; the direct current conversion cabinet comprises a ground main control circuit, a direct current conversion power supply, a ground communication circuit, a touch display screen, a master control switch, a soft start circuit, a step-up transformer and a rectification filter circuit which are sequentially connected, wherein high-voltage direct current output by the rectification filter circuit is connected to a special cable through a slip ring and a cable reel and is transmitted to an underground system; the underground power inverter system comprises a soft start switch circuit, a power inverter circuit, a single chip microcomputer control circuit, a CPLD preset circuit, a PWM circuit, a drive protection circuit, a detection circuit, a frequency tracking circuit, an underground communication circuit and a direct current conversion circuit; the power inverter circuit comprises a first IGBT tube, a second IGBT tube, a third IGBT tube and a fourth IGBT tube which are in bridge connection; the singlechip control circuit is used for storing and controlling the underground power inverter circuit to work in a program mode; the CPLD presetting circuit is used for presetting and executing a self-checking instruction and transmitting a pulse driving signal according to a program instruction of the singlechip control circuit; the PWM circuit is used for pulse width modulation; the driving protection circuit is used for self-checking protection of high voltage, low voltage, temperature and current of the power inverter circuit, and comprises an HML integrated block, an isolation grating U5, a NOT gate U4 and a NAND gate U5; the frequency tracking circuit comprises a phase-locked loop circuit U8, an operational amplifier U7-1, an operational amplifier U7-2 and a voltage division circuit; the output signal of the phase-locked loop circuit U8 is in signal connection with the singlechip control circuit; the detection circuit is used for detecting the state and the running state of the underground system during starting, carrying out signal transmission with the ground communication circuit 21 through the underground communication circuit 22 and displaying the output state on the touch display screen 17; the underground communication circuit is in signal connection with the ground communication circuit and displays the running state through the touch display screen; the direct current conversion circuit is used for supplying low-voltage direct current for each underground control circuit.
2. A high efficiency ultrasonic zonal treatment system in accordance with claim 1, wherein the soft start circuit is configured with a start switch and a stop switch for start and stop.
3. The system according to claim 1, wherein the dc converter cabinet is further provided with a start/stop button for controlling the start/stop of the downhole system.
4. A high efficiency ultrasonic reservoir treatment system according to claim 1 wherein the dedicated cable comprises a power transmission cable for transmitting high voltage direct current and four communication cables for uphole and downhole data transmission.
5. A high efficiency ultrasonic zonal treatment system in accordance with claim 4, wherein the DC conversion circuit outputs DC voltages of 24V, 12V, 5V, 3V, respectively.
6. The high efficiency ultrasonic zonal treatment system of claim 1, the touch screen display comprising a left touch start and stop button, a power display and adjustment button, a frequency display and adjustment button, a duty cycle display and adjustment button, and a right management control display, a fault display, an input status display, a dc status display, an output status display.
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