CN105201475B - High cumulative repeats flash wave injection well or de-plugging of well method and apparatus - Google Patents
High cumulative repeats flash wave injection well or de-plugging of well method and apparatus Download PDFInfo
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- CN105201475B CN105201475B CN201510603511.7A CN201510603511A CN105201475B CN 105201475 B CN105201475 B CN 105201475B CN 201510603511 A CN201510603511 A CN 201510603511A CN 105201475 B CN105201475 B CN 105201475B
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Abstract
The present invention relates to a kind of high cumulatives to repeat flash wave injection well or de-plugging of well method and apparatus, including device on well and downhole hardware two parts, device includes power grid and step-up transformer on well, and downhole hardware includes step-down transformer, straightening and filtering unit, high power contravariant device, pulse transformer arrangement, energy storage device, high-pressure solid switch, signal supervisory instrument, control device and discharge electrode.The present invention carries out inversion to low-voltage dc power supply and handles to obtain a bipolarity action of low-voltage pulse power supply, bipolarity action of low-voltage pulse power supply carries out boosting and rectification is handled to obtain high-voltage pulse power source and be charged to energy storage device, high-pressure solid switch conducting is controlled as discharge switch using high-pressure solid switch, realizes that discharge electrode electric discharge generates electrohydraulic effect to dredge oil circuit.Flash wave injection well or de-plugging of well method and apparatus are repeated using high cumulative of the invention, operational procedure can be simplified with lifting system stability, improve construction efficiency, reduce construction cost.
Description
Technical field
The invention belongs to de-plugging of well to increase production field, be related to high-voltage pulse technology, concretely relate to a kind of high poly-
It can repeat flash wave injection well or de-plugging of well method and apparatus.
Background technique
With the increase in oil well well age, the oil outlet of many oil wells is caused due to accumulation of impurities and long-term injection of polymer
Permeability blocked path, bottom pressure increase, and the decline of injection of polymer effect causes oil well output to reduce or even partial outage.
Existing method for removing blockage has physics de-plugging, chemical plugging removal and biological plugging releasing.Physics method for removing blockage construction procedure is more
It is cumbersome；Chemical plugging removal method is at high cost, and de-plugging validity period is short, causes secondary injury to oil well, be easy to cause environmental pollution etc. prominent
It goes wrong；Biological plugging releasing method is very high to environmental requirement, and technology is not mature enough.
Down-hole high pressure electrical pulse blocking removing technology is exactly a kind of new technique of physical method raising well recovery rate, basic
Principle is: using the stress effect of electrohydraulic effect, energy storage device generates the big electricity of pulse in the oil well full of water or oil water mixture
Stream forms electric spark explosion between the electrodes, to surrounding formation excitation cycle shock wave, forms man-made explosion.This underground
High electric field pulse block releasing technique, under repetitious shock wave, can achieve improves formation condition, Quick dredging permeability
Access, the effect for improving oil well permeability, to improve blocking well oil output.
There are problems in existing all kinds of electrical pulse blocking removing devices, so that the popularization of the device is restricted.It is existing
Electrical pulse blocking removing device in, trigger switch mostly use gas electric spark switch, in Patent No. 200820029051.7
A kind of high cumulative highpowerpulse device energy controller disclosed in state's utility model patent is a relatively good embodiment,
But mainly there are two disadvantage is inevitable: first, the service life limit is no more than 3000 times.This causes in the construction process
Gas electric spark switch is needed to constantly change, not only improves construction cost, but also increase difficulty of construction, wastes the plenty of time.This
In, the existing apparatus discharge switch service life is short, is most distinct issues.Second, the working principle of gas electric spark switch is: gas
Electric spark switch is connected in discharge loop, when the voltage of gas electric spark switch ends reaches its intrinsic setting value (
I other words when being charged to the setting voltage value of energy storage device), gas electric spark closes the switch energy storage device electric discharge, gas electric spark
Switching its setting voltage value that once completes can not change in underground, highly difficult changing on well.It can be seen that every
Secondary discharge energy be it is fixed and uncontrollable, can not be adjusted according to live operating condition, be easy to injection well or oil well
Generate injury.
In consideration of it, being badly in need of developing new oilfield exploitation technology to improve blocking oil well output.
Summary of the invention
According to above-described prominent technical problem, the present invention provides a kind of high cumulative repetition based on high-pressure solid switch
Flash wave injection well or de-plugging of well method and apparatus, using high-pressure solid switch as discharge switch, the big, function with capacity
The advantages that rate height, discharge switch long service life, repeats flash using the high cumulative of the invention based on high-pressure solid switch
Wave injection well or de-plugging of well method and apparatus can simplify operational procedure with lifting system stability, improve construction efficiency, drop
Low construction cost.
To achieve the goals above, the present invention adopts the following technical scheme that.
A kind of high cumulative repeats flash wave injection well or de-plugging of well method, method includes the following steps:
Two parts of device and downhole hardware on well are arranged in step 1, are obtained by transformer and rectification filtering module low
Press DC power supply；
Step 2 carries out inversion processing to low-voltage dc power supply, obtains a bipolarity action of low-voltage pulse power supply；
Step 3 carries out boosting to bipolarity action of low-voltage pulse power supply and rectification is handled, obtains high-voltage pulse power source；
Step 4 charges to energy storage device using high-voltage pulse power source；
Step 5 controls high-pressure solid switch conducting, discharge electrode electric discharge using high-pressure solid switch as discharge switch
It generates electrohydraulic effect and dredges oil circuit.
Preferably, in said step 1, power grid exports 380V three-phase alternating current on well, then boosted transformer liter
It is depressed into 2000V, then through cable transfer to underground, 2000V alternating current is depressurized to 380V, 380V by the step-down transformer of underground setting
A low-voltage dc power supply is exported after the rectified filtering processing of three-phase alternating current.
In any of the above-described technical solution preferably, in the step 2, underground be arranged high power contravariant device and
Control device, high power contravariant device carry out inversion processing to low-voltage DC, and control device is controlled by duty ratio modulation
The adjustable bipolarity action of low-voltage pulse power supply of high power contravariant device output pulse width.
In any of the above-described technical solution preferably, in the step 3, pulse transformer arrangement, arteries and veins is arranged in underground
It rushes after device for transformer carries out boosting and rectification processing to bipolarity action of low-voltage pulse power supply and exports high-voltage pulse power source.
In any of the above-described technical solution preferably, in the step 4, energy storage device, signal detection is arranged in underground
Device and discharge electrode, high-voltage pulse power source charge to energy storage device.
In any of the above-described technical solution preferably, in the step 4, the step of energy storage device is charged tool
Body includes: the first step, and according to the requirement of oil well or injection well scene discharge energy, energy storage device voltage can flexibly be arranged on well
The criterion how many as charging criterion and discharge energy；Second step, charge control；Third step measures energy storage device end electricity
Pressure；4th step, judges whether energy storage device end voltage meets setting value requirement.
In any of the above-described technical solution preferably, in the step 4, the step of energy storage device is charged
4th step judges whether energy storage device end voltage meets setting value requirement: wanting if being unsatisfactory for energy storage device end voltage setting value
It asks, is transferred to second step and carries out charge control, preset until energy storage device amplitude reaches, complete the charging to energy storage device；
If meeting the voltage requirement of energy storage device end, stop charging, and issue the instruction for allowing to discharge.
In any of the above-described technical solution preferably, in the step 5, when signal supervisory instrument detects energy storage
When device both end voltage reaches discharge threshold, control device controls high power contravariant device and stops output, while controlling high pressing
Body switch conduction discharges at discharge electrode, quick-fried by electrohydraulic effect generation electric spark, generates intense impact wave impact peripherally
Layer dredges permeability access；When signal supervisory instrument detects that energy storage device both end voltage is reduced to charge threshold, control device
Control high power contravariant device starts to export, while controlling high-pressure solid switch disconnection, restarts to charge to energy storage device.
The invention also discloses a kind of high cumulatives to repeat flash wave injection well or de-plugging of well device, this is that one kind is used for
Realize as above described in any item high cumulatives repetition flash wave injection wells or the plug-removing device of de-plugging of well method.De-plugging dress
It sets including device on well and downhole hardware two parts, device and downhole hardware pass through cable connection on well.
In any of the above-described technical solution preferably, device includes power grid and step-up transformer on the well；The electricity
The 380V three-phase alternating current of net output boosts to 2000V by step-up transformer, through cable transfer to downhole hardware.
In any of the above-described technical solution preferably, the downhole hardware include step-down transformer, straightening and filtering unit,
It high power contravariant device, pulse transformer arrangement, energy storage device, high-pressure solid switch, signal supervisory instrument, control device and puts
Electrode.
In any of the above-described technical solution preferably, the step-down transformer and step-up transformer pass through cable connection,
The 2000V alternating current of cable transfer is depressurized to 380V by the step-down transformer.
In any of the above-described technical solution preferably, the step-down transformer is connected with straightening and filtering unit, described
380V three-phase alternating current is input to straightening and filtering unit by step-down transformer.
In any of the above-described technical solution preferably, the straightening and filtering unit and one phase of high power contravariant device interface
Connection, the straightening and filtering unit export a low-voltage dc power supply after 380V three-phase alternating current is rectified, is filtered
To high power contravariant device.
In any of the above-described technical solution preferably, the interface three and control device interface of the high power contravariant device
One is connected, the high power contravariant device to low-voltage DC carry out inversion processing, control device by duty ratio modulation come
Control the adjustable bipolarity action of low-voltage pulse power supply of high power contravariant device output pulse width.
In any of the above-described technical solution preferably, the interface two of the high power contravariant device and pulse transformer fill
It sets and is connected, pulse transformer arrangement is connected with the interface one of energy storage device；Pulse transformer arrangement is to bipolarity low-tension pulse
It rushes power supply and carries out boosting and rectification processing, export high-voltage pulse power source, charge to energy storage device.
In any of the above-described technical solution preferably, the interface three of the energy storage device is connected with signal supervisory instrument
It connects, signal supervisory instrument is connected with the interface three of control device, and the interface two of control device connects connecing for high-pressure solid switch
Enter end, the output end of high-pressure solid switch connects discharge electrode, and discharge electrode accesses oil well.
In any of the above-described technical solution preferably, the interface two of the energy storage device connects connecing for high-pressure solid switch
Enter end, the output end of high-pressure solid switch connects discharge electrode, and discharge electrode accesses oil well.
In any of the above-described technical solution preferably, the high power contravariant device includes inverter circuit, driving circuit
With protection circuit.
In any of the above-described technical solution preferably, the inverter circuit is connected with driving circuit, the inversion electricity
Road is used to carry out low-voltage dc power supply inversion processing to obtain bipolarity action of low-voltage pulse power supply.
In any of the above-described technical solution preferably, the driving circuit is connected with protection circuit；The driving electricity
Road adjusts the duty ratio of bipolarity action of low-voltage pulse power supply according to the control signal that control device exports, and then adjusts inverter circuit
The pulse width of output, the final adjustable bipolarity action of low-voltage pulse power supply of inverter circuit output amplitude.
In any of the above-described technical solution preferably, the pulse transformer arrangement include high-power pulse transformer and
Impulse commutation filter circuit.
In any of the above-described technical solution preferably, the both ends of the high-power pulse transformer respectively with it is high-power inverse
Become device to be connected with energy storage device, the high-power pulse transformer is for carrying out at boosting bipolarity action of low-voltage pulse power supply
Reason.
In any of the above-described technical solution preferably, the impulse commutation filter circuit is connected with inverter circuit；Institute
It states impulse commutation filter circuit and rectifying and wave-filtering processing is carried out to the Bi-Directional Pulsed Voltage Technique after boosting, export high-voltage pulse power source.
In any of the above-described technical solution preferably, the energy storage device includes N number of super capacitor, N number of super capacitor
It is connected in series.
In any of the above-described technical solution preferably, the high-pressure solid switch includes N group electronic power switch group, N
Group electronic power switch group is connected in parallel in order.
In any of the above-described technical solution preferably, the electronic power switch group includes M power switch (such as IGBT
Deng), M power switch is connected in series in order.
In any of the above-described technical solution preferably, the power switch uses IGBT insulated gate bipolar transistor.
In any of the above-described technical solution preferably, the discharge electrode includes top electrode and lower electrode.
In any of the above-described technical solution preferably, the high-voltage pulse power source is by adjusting bipolarity action of low-voltage pulse
Duty ratio obtained a width and all adjustable high-voltage pulse power source of frequency；Duty ratio formula is D=TON/(TON+TOFF),
Wherein D indicates duty ratio, TONIndicate turn-on time, TOFFIndicate the turn-off time；Know average voltage U=D × V, wherein U table
Show that average voltage, V indicate voltage peak；Output high-accuracy voltage is adjusted by changing duty ratio.
High cumulative based on high-pressure solid switch of the invention repeats flash wave injection well or de-plugging of well method and dress
It sets, is provided with two parts of device and downhole hardware on well, device includes power grid and step-up transformer on well, and downhole hardware includes
Step-down transformer, straightening and filtering unit, high power contravariant device, pulse transformer arrangement, energy storage device, high-pressure solid switch,
Signal supervisory instrument, control device and discharge electrode.High cumulative of the invention repeats flash wave injection well or de-plugging of well side
Method and device, obtain low-voltage dc power supply by transformer and rectification filtering module, carry out inversion processing to low-voltage dc power supply
A bipolarity action of low-voltage pulse power supply is obtained, boosting is carried out to bipolarity action of low-voltage pulse power supply and rectification handles to obtain high-voltage pulse
Power supply, charges to energy storage device using high-voltage pulse power source, controls height as discharge switch using high-pressure solid switch
Pressing body switch conduction then realizes that discharge electrode electric discharge generates electrohydraulic effect to dredge oil circuit.
Compared with prior art, the high cumulative of the invention based on high-pressure solid switch repeats flash wave injection well or oil
Well method for removing blockage and device have the advantages that following four:
(1) discharge switch using high-pressure solid switch substitution gas switch as device, has service life (the electrical longevity
Life) it grows, the advantages that fast, controllability is high is connected；
(2) low voltage control charging is carried out to energy storage device using high-voltage pulse power source；
(3) discharge switch using high-pressure solid switch substitution gas switch as device, realizes that low voltage control high pressure is super
Grade capacitor electric discharge；
(4) by effective control method, it can be realized and injection well or oil well are not damaged.
Detailed description of the invention
Fig. 1 is that high cumulative according to the invention repeats the one of flash wave injection well or de-plugging of well method and apparatus preferably
The method for removing blockage flow diagram of embodiment；
Fig. 2 is the preferred embodiment that high cumulative according to the invention repeats flash wave injection well or de-plugging of well device
Structural block diagram；
Fig. 3 is the preferred embodiment that high cumulative according to the invention repeats flash wave injection well or de-plugging of well device
System circuit diagram；
Fig. 4 is the preferred embodiment that high cumulative according to the invention repeats flash wave injection well or de-plugging of well device
High-pressure solid switch structural schematic diagram；
Fig. 5 is that high cumulative according to the invention repeats the one of flash wave injection well or de-plugging of well method and apparatus preferably
The pulse transformer unit of embodiment carries out the schematic illustration of amplitude processing to bipolarity action of low-voltage pulse power supply；
Fig. 6 is that high cumulative according to the invention repeats the one of flash wave injection well or de-plugging of well method and apparatus preferably
The waveform of embodiment becomes just by the waveform overturning under pulse transformer arrangement boosting and rectifying and wave-filtering treated reference axis
Waveform and the unconverted schematic diagram of amplitude；
Fig. 7 is that high cumulative according to the invention repeats the one of flash wave injection well or de-plugging of well method and apparatus preferably
The duty ratio of the positive negative wave by changing highpowerpulse inverter of embodiment obtains the wave of bipolarity action of low-voltage pulse
Shape schematic diagram；
Fig. 8 is that high cumulative according to the invention repeats the one of flash wave injection well or de-plugging of well method and apparatus preferably
The high-voltage pulse power source for being 30KV by pulse transformer arrangement boosting and rectifying and wave-filtering treated output amplitude of embodiment
Waveform diagram；
Fig. 9 is that high cumulative according to the invention repeats the one of flash wave injection well or de-plugging of well method and apparatus preferably
The charge step schematic diagram of the super capacitor of the energy storage device of embodiment.
Specific embodiment
It elaborates, is described below only as demonstration reconciliation to the present invention with reference to the accompanying drawings and detailed description
It releases, it is intended that the present invention is limited in any way.
As shown in Figure 1, high cumulative repeats flash wave injection well or de-plugging of well method includes the following steps:
Firstly, two parts of device and downhole hardware on setting well, obtain low pressure by transformer and rectification filtering module
DC power supply；Then, inversion processing is carried out to low-voltage dc power supply, obtains a bipolarity action of low-voltage pulse power supply；Again to bipolar
Property action of low-voltage pulse power supply carry out boosting and rectification processing, to obtain high-voltage pulse power source；Then, using high-voltage pulse power source to storage
Energy device charges；Finally, controlling high-pressure solid switch conducting, electric discharge electricity as discharge switch using high-pressure solid switch
Pole electric discharge generates electrohydraulic effect and dredges oil circuit.
It is repeated in flash wave injection well or de-plugging of well method in high cumulative, implements the first step, power grid output on well
380V three-phase alternating current, then boosted transformer boosts to 2000V, then through cable transfer to underground, the decompression of underground setting
2000V alternating current is depressurized to 380V by transformer, and a low-voltage direct is exported after the rectified filtering processing of 380V three-phase alternating current
Power supply；In second step, underground is arranged high power contravariant device and control device, high power contravariant device to low-voltage DC into
Row inversion processing, control device control the adjustable bipolarity of high power contravariant device output pulse width by duty ratio modulation
Action of low-voltage pulse power supply；In third step, pulse transformer arrangement is arranged in underground, and pulse transformer arrangement is to bipolarity action of low-voltage pulse
Power supply exports high-voltage pulse power source after carrying out boosting and rectification processing；In four steps, energy storage device, signal detection is arranged in underground
Device and discharge electrode, high-voltage pulse power source charge to energy storage device.When signal supervisory instrument detects energy storage device two
When end voltage reaches discharge threshold, control device controls high power contravariant device and stops output, while controlling high-pressure solid switch
Conducting is discharged at discharge electrode, quick-fried by electrohydraulic effect generation electric spark, generates intense impact wave impact surrounding formation, dredging
Permeability access；And when signal supervisory instrument detects that energy storage device both end voltage is reduced to charge threshold, control device control
High power contravariant device starts to export, while controlling high-pressure solid switch disconnection, restarts to charge to energy storage device.
Flash wave injection well or de-plugging of well method are repeated based on the high cumulative, designs a kind of high cumulative repetition flash
Wave injection well or de-plugging of well device, the plug-removing device are made of on the well and part of underground two, well-surface part and underground part
By cable connection and realize voltage transmission.Device part includes power grid and step-up transformer, downhole hardware part on well
It then include step-down transformer, straightening and filtering unit, high power contravariant device, pulse transformer arrangement, energy storage device, high pressing
Body switch, signal supervisory instrument, control device and discharge electrode.
High cumulative repeats flash wave injection well or the working principle of de-plugging of well device is as shown in Figure 2: power grid output
380V three-phase alternating current boosts to 2000V by step-up transformer, through cable transfer to downhole hardware part；Downhole hardware part
Step-down transformer and step-up transformer by cable connection so that the 2000V alternating current of cable transfer is depressured to from well
380V；Step-down transformer is connected with straightening and filtering unit, and 380V three-phase alternating current is input to straightening and filtering unit；Rectifying and wave-filtering
Device is connected with high power contravariant device interface 1, and straightening and filtering unit is rectified 380V three-phase alternating current, at filtering
Reason, exports a low-voltage dc power supply；The interface 3 of high power contravariant device is connected with control device interface 1, high power contravariant
Device carries out inversion processing to low-voltage DC, and control device exports arteries and veins by duty ratio modulation, control high power contravariant device
Rush broad-adjustable bipolarity action of low-voltage pulse power supply；The interface 2 of high power contravariant device is connected with pulse transformer arrangement, arteries and veins
Device for transformer is rushed to be connected with the interface 1 of energy storage device；Pulse transformer arrangement rises bipolarity action of low-voltage pulse power supply
Pressure and rectification processing, export high-voltage pulse power source, charge to energy storage device；The interface 3 and signal detection of energy storage device fill
It sets and is connected, signal supervisory instrument is connected with the interface 3 of control device, and the interface 2 of control device connects high-pressure solid switch
Incoming end, the output end of high-pressure solid switch connects discharge electrode, and discharge electrode accesses oil well；The interface 2 of energy storage device connects
The incoming end of high-pressure solid switch is connect, the output end of high-pressure solid switch connects discharge electrode, and discharge electrode accesses oil well；Work as letter
When number detection device detects that energy storage device both end voltage reaches discharge threshold, control device, which controls high power contravariant device, to be stopped
Output, while high-pressure solid switch conducting is controlled, it discharges at discharge electrode, it is quick-fried by electrohydraulic effect generation electric spark, it generates strong
Strong impact wave impact surrounding formation dredges permeability access；When signal supervisory instrument detects that energy storage device both end voltage is reduced to
When charge threshold, control device control high power contravariant device starts to export, while controlling high-pressure solid switch disconnection, opens again
Begin to charge to energy storage device.
High cumulative repeats flash wave injection well or the circuit system principle of de-plugging of well device is as shown in Figure 3: high-power
Inverter includes inverter circuit, driving circuit and protection circuit；Inverter circuit is connected with driving circuit, and inverter circuit is used for
Inversion processing is carried out to low-voltage dc power supply and obtains bipolarity action of low-voltage pulse power supply；Driving circuit is connected with protection circuit, drives
The control signal that dynamic circuit is exported according to control module, adjusts the duty ratio of bipolarity action of low-voltage pulse power supply, to adjust inversion electricity
The pulse width of road output, the final adjustable bipolarity action of low-voltage pulse power supply of inverter circuit output amplitude.Pulse transformer arrangement
Including high-power pulse transformer and impulse commutation filter circuit, the both ends of high-power pulse transformer respectively with high power contravariant
Device is connected with energy storage device, and high-power pulse transformer carries out boosting processing to bipolarity action of low-voltage pulse power supply；Pulse is whole
Stream filter circuit is connected with inverter circuit, and impulse commutation filter circuit carries out rectification filter to the Bi-Directional Pulsed Voltage Technique after boosting
Wave processing is to export high-voltage pulse power source.Energy storage device includes N number of super capacitor, and energy storage device is by N number of super capacitor series connection group
At.High-pressure solid switch includes N group electronic power switch group.Discharge electrode is made of top electrode and lower electrode, lower electrode merging
In oil water mixture.
High cumulative of the invention repeats flash wave injection well or de-plugging of well method and apparatus are a kind of based on high pressing
The high cumulative of body switch repeats flash wave injection well or de-plugging of well method and apparatus, substitutes gas using high-pressure solid switch
The discharge switch as device is switched, high-pressure solid switch has service life (electrical endurance) long, fast, controllability height of conducting etc.
Advantage.As shown in figure 4, high-pressure solid switch can be composed in parallel in order by N group electronic power switch group, power electronics is opened
Pass group can be composed in series in order by M IGBT power switch.IGBT insulated gate bipolar transistor controls driving electricity due to it
The feature that road is simple, driving voltage is low, working frequency is higher, capacity is larger is suitable for the high power switch as the present invention
In power supply device.In this way, realizing the electric discharge of low voltage control high-voltage super capacitor.
Pulse transformer arrangement to bipolarity action of low-voltage pulse power supply carry out amplitude processing principle as shown in Fig. 5 to Fig. 8, when
After the boosting of pulse transformer arrangement and rectifying and wave-filtering processing, the waveform under reference axis is just overturn waveform as shown in Figure 5
Become positive waveform, as shown in fig. 6, its amplitude does not change；If by changing the positive and negative of highpowerpulse inverter
The duty ratio of waveform, the waveform for obtaining bipolarity action of low-voltage pulse are as shown in Figure 7；By the boosting and rectification of pulse transformer arrangement
After filtering processing, output amplitude is the high-voltage pulse power source of 30KV, and waveform is as shown in Figure 8.
It is repeated in flash wave injection well or de-plugging of well method and apparatus in high cumulative, by adjusting bipolarity low-tension pulse
The duty ratio of punching obtains a width and all adjustable high-voltage pulse power source of frequency.By duty ratio formula D=TON/(TON+
TOFF), wherein D indicates duty ratio, TONIndicate turn-on time, TOFFIndicate the turn-off time, it is known that average voltage U=D × V,
Middle U indicates that average voltage, V indicate voltage peak, therefore by changing duty ratio, has reached adjusting output high-accuracy voltage
Purpose.In this way, realizing the charging of low voltage control super capacitor.
Energy storage device can be composed in series by N number of super capacitor.High-voltage pulse power source charges to super capacitor.High pressure
Solid switch controls high-pressure solid switch conducting as discharge switch, and discharge electrode electric discharge generates electrohydraulic effect, then dredging oil
Road.
As shown in figure 9, energy storage device (super capacitor) charge step:
It is (super energy storage device can be flexibly arranged according to the requirement of oil well or injection well scene discharge energy in the first step on well
Grade capacitor) the voltage criterion how many as charging criterion and discharge energy.In this way, before charging to energy storage device,
The size that energy storage device discharge energy is arranged avoids discharge energy is excessive from causing serious injury to oil well or injection well, due to energy storage
The numerical value of the end voltage of device (super capacitor) represents the size of discharge energy, and for designed system, discharge energy
It is of equal value for measuring and set energy storage device (super capacitor) voltage, it is assumed here that the end electricity of energy storage device (super capacitor) need to first be arranged
Pressure, such as 30KV.
Second step, charge control.According to the state of energy storage device, accounting for for bipolarity action of low-voltage pulse is controlled by control device
Empty ratio, the suitable pulse dc power voltage (equivalent adequate impulse charging current) of output amplitude (average value) is to energy storage device
It charges.In this way, with the progress of charging process, energy storage device both end voltage is gradually risen.
Third step measures energy storage device end voltage.
4th step, judges whether energy storage device end voltage meets setting value requirement.
If being unsatisfactory for the voltage setting value requirement of energy storage device end, it is transferred to second step, until energy storage device amplitude is (average
Value) when reaching pre-set 30KV, complete the charging to energy storage device.
If meeting the voltage requirement of energy storage device end, stop charging, and issue the instruction for allowing to discharge.
It can be seen that high cumulative of the invention repeats flash wave injection well or de-plugging of well method and apparatus: (1) using
High-pressure solid switch substitutes discharge switch of the gas switch as device, guarantees that theoretic service life (electrical endurance) can be with
Infinitely；(2) low pressure charging is carried out to energy storage device using high-voltage pulse power source, is on the one hand far smaller than charge power supply voltage
Energy storage device both end voltage is in low-voltage state, reduces power supply cost；On the other hand, high-voltage pulse power source controllability is strong, makes
System is easier to control charging process；(3) by effective control method, guarantee to provide according to the actual needs of the site and suitably put
Electric flux can be realized and not damage to injection well.So the high cumulative based on high-pressure solid switch repeats flash wave note
Poly- well or de-plugging of well method and apparatus are optimal cases.
When charging to energy storage device, initial stage, control device controls the duty ratio of bipolarity action of low-voltage pulse, output
Amplitude (average value) lesser pulse dc power charges to energy storage device.As energy storage device both end voltage increases, control
The duty ratio of device control bipolarity action of low-voltage pulse processed, so that the direct current pulse power source amplitude (average value) of output is gradually increased,
When amplitude (average value) reaches 30KV, the charging to energy storage device is completed.
The above is only that preferred embodiments of the present invention will be described, is limited the scope of the present invention
Fixed, without departing from the spirit of the design of the present invention, this field ordinary engineering and technical personnel makees technical solution of the present invention
Various changes and improvements out, should fall within the scope of protection determined by the claims of the present invention.
Claims (21)
1. a kind of high cumulative repeats flash wave injection well or de-plugging of well method, it is characterised in that: this method includes following step
It is rapid:
Two parts of device and downhole hardware on well are arranged in step 1, obtain low-pressure direct by transformer and rectification filtering module
Galvanic electricity source；Power grid on well exports 380V three-phase alternating current, and then boosted transformer boosts to 2000V, then through cable transfer
To underground, 2000V alternating current is depressurized to 380V by the step-down transformer of underground setting, at the rectified filtering of 380V three-phase alternating current
A low-voltage dc power supply is exported after reason；
Step 2 carries out inversion processing to low-voltage dc power supply, obtains a bipolarity action of low-voltage pulse power supply；Big function is arranged in underground
Rate inverter and control device, the high power contravariant device carry out inversion processing, the control device to low-voltage DC
The adjustable bipolarity action of low-voltage pulse power supply of the high power contravariant device output pulse width is controlled by duty ratio modulation；
Step 3 carries out boosting to bipolarity action of low-voltage pulse power supply and rectification is handled, obtains high-voltage pulse power source；Arteries and veins is arranged in underground
Device for transformer is rushed, which exports high pressure after carrying out boosting and rectification processing to bipolarity action of low-voltage pulse power supply
The pulse power；
Step 4 charges to energy storage device using high-voltage pulse power source；Underground be arranged energy storage device, signal supervisory instrument and
Discharge electrode, high-voltage pulse power source charge to energy storage device；The step of energy storage device is charged specifically includes: first
Energy storage device voltage is flexibly arranged on well and is used as charging criterion according to the requirement of oil well or injection well scene discharge energy for step,
It is also the how many criterion of discharge energy, before charging to energy storage device, the size of setting energy storage device discharge energy is kept away
Exempt from that discharge energy is excessive to cause serious injury to oil well or injection well, since the numerical value of the end voltage of energy storage device represents electric discharge
The size of energy, for designed system, discharge energy and energy storage device voltage are of equal value；Second step, charging control
System controls the duty ratio of bipolarity action of low-voltage pulse, the suitable arteries and veins of output amplitude by control device according to the state of energy storage device
It rushes direct current power source voltage to charge to energy storage device, with the progress of charging process, energy storage device both end voltage is gradually risen；
Third step measures energy storage device end voltage；4th step, judges whether energy storage device end voltage meets setting value requirement: if not
Meet the voltage setting value requirement of energy storage device end, is transferred to second step and carries out charge control, until energy storage device amplitude reaches preparatory
The charging to energy storage device is completed in setting；If meeting the voltage requirement of energy storage device end, stop charging, and sending allows to discharge
Instruction；
Step 5 controls high-pressure solid switch conducting using high-pressure solid switch as discharge switch, and discharge electrode electric discharge generates
Electrohydraulic effect and dredge oil circuit；When signal supervisory instrument detects that energy storage device both end voltage reaches discharge threshold, control dress
It sets control high power contravariant device and stops output, while controlling high-pressure solid switch conducting, discharge at discharge electrode, by liquid electricity
Effect generation electric spark is quick-fried, generates intense impact wave impact surrounding formation, dredges permeability access；When signal supervisory instrument detects
When energy storage device both end voltage is reduced to charge threshold, control device control high power contravariant device starts to export, and controls simultaneously
High-pressure solid switch disconnects, and restarts to charge to energy storage device.
2. high cumulative repeats the device of flash wave injection well or de-plugging of well method to a kind of basis as described in claim 1,
It is characterized by: it includes device and downhole hardware on well that high cumulative, which repeats flash wave injection well or the device of de-plugging of well method,
Two parts, device and downhole hardware pass through cable connection on the well；Device includes power grid and step-up transformer on the well；Institute
The 380V three-phase alternating current for stating power grid output boosts to 2000V by step-up transformer, through cable transfer to downhole hardware；It is described
Downhole hardware includes step-down transformer, straightening and filtering unit, high power contravariant device, pulse transformer arrangement, energy storage device, height
Press solid switch, signal supervisory instrument, control device and discharge electrode.
3. high cumulative as claimed in claim 2 repeats the device of flash wave injection well or de-plugging of well method, feature exists
In: by cable connection, the step-down transformer exchanges the 2000V of cable transfer for the step-down transformer and step-up transformer
Electricity is depressurized to 380V.
4. high cumulative as claimed in claim 2 repeats the device of flash wave injection well or de-plugging of well method, feature exists
In: the step-down transformer is connected with straightening and filtering unit, and 380V three-phase alternating current is input to whole by the step-down transformer
Flow filter.
5. high cumulative as claimed in claim 2 repeats the device of flash wave injection well or de-plugging of well method, feature exists
In: the straightening and filtering unit is connected with high power contravariant device interface one, and the straightening and filtering unit intersects 380V tri-
Galvanic electricity exports a low-voltage dc power supply to high power contravariant device after being rectified, being filtered.
6. high cumulative as claimed in claim 2 repeats the device of flash wave injection well or de-plugging of well method, feature exists
In: the interface three of the high power contravariant device is connected with control device interface one, and the high power contravariant device is to low pressure
Direct current carries out inversion processing, and it is adjustable that control device controls high power contravariant device output pulse width by duty ratio modulation
Bipolarity action of low-voltage pulse power supply.
7. high cumulative as claimed in claim 2 repeats the device of flash wave injection well or de-plugging of well method, feature exists
In: the interface two of the high power contravariant device is connected with pulse transformer arrangement, pulse transformer arrangement and energy storage device
Interface one be connected；Pulse transformer arrangement carries out boosting to bipolarity action of low-voltage pulse power supply and rectification is handled, and exports high pressure
The pulse power charges to energy storage device.
8. high cumulative as claimed in claim 2 repeats the device of flash wave injection well or de-plugging of well method, feature exists
In: the interface three of the energy storage device is connected with signal supervisory instrument, the interface three-phase of signal supervisory instrument and control device
Connection, the interface two of control device connect the incoming end of high-pressure solid switch, the output end connection electric discharge electricity of high-pressure solid switch
Pole, discharge electrode access oil well.
9. high cumulative as claimed in claim 2 repeats the device of flash wave injection well or de-plugging of well method, feature exists
In: the interface two of the energy storage device connects the incoming end of high-pressure solid switch, and the output end of high-pressure solid switch connects electric discharge
Electrode, discharge electrode access oil well.
10. the high cumulative as described in any one of claim 2,6,7 repeats flash wave injection well or de-plugging of well method
Device, it is characterised in that: the high power contravariant device includes inverter circuit, driving circuit and protection circuit.
11. high cumulative as claimed in claim 10 repeats the device of flash wave injection well or de-plugging of well method, feature
Be: the inverter circuit is connected with driving circuit, and the inverter circuit is used to carry out inversion processing to low-voltage dc power supply
To obtain bipolarity action of low-voltage pulse power supply.
12. high cumulative as claimed in claim 10 repeats the device of flash wave injection well or de-plugging of well method, feature
Be: the driving circuit is connected with protection circuit；Control signal that the driving circuit is exported according to control device is adjusted
The duty ratio of whole bipolarity action of low-voltage pulse power supply then adjusts the pulse width of inverter circuit output, final inverter circuit output
The adjustable bipolarity action of low-voltage pulse power supply of amplitude.
13. high cumulative as claimed in claim 2 repeats the device of flash wave injection well or de-plugging of well method, feature exists
In: the pulse transformer arrangement includes high-power pulse transformer and impulse commutation filter circuit.
14. high cumulative as claimed in claim 13 repeats the device of flash wave injection well or de-plugging of well method, feature
Be: the both ends of the high-power pulse transformer are connected with high power contravariant device and energy storage device respectively, the big function
Rate pulse transformer is for carrying out boosting processing to bipolarity action of low-voltage pulse power supply.
15. high cumulative as claimed in claim 13 repeats the device of flash wave injection well or de-plugging of well method, feature
Be: the impulse commutation filter circuit is connected with inverter circuit；The impulse commutation filter circuit is to bipolar after boosting
Property pulse voltage carry out rectifying and wave-filtering processing, export high-voltage pulse power source.
16. the high cumulative as described in any one of claim 2,8,9 repeats flash wave injection well or de-plugging of well method
Device, it is characterised in that: the energy storage device includes N number of super capacitor, and N number of super capacitor is connected in series.
17. high cumulative as claimed in claim 2 repeats the device of flash wave injection well or de-plugging of well method, feature exists
In: the high-pressure solid switch includes N group electronic power switch group, and N group electronic power switch group is connected in parallel in order.
18. high cumulative as claimed in claim 17 repeats the device of flash wave injection well or de-plugging of well method, feature
Be: the electronic power switch group includes M power switch, and M power switch is connected in series in order.
19. high cumulative as claimed in claim 18 repeats the device of flash wave injection well or de-plugging of well method, feature
Be: the power switch uses IGBT insulated gate bipolar transistor.
20. high cumulative as claimed in claim 2 repeats the device of flash wave injection well or de-plugging of well method, feature exists
In: the discharge electrode includes top electrode and lower electrode.
21. the high cumulative as described in claim 7 or 15 repeats the device of flash wave injection well or de-plugging of well method, special
Sign is: the high-voltage pulse power source be the obtained width of duty ratio by adjusting bipolarity action of low-voltage pulse and frequency all
Adjustable high-voltage pulse power source；Duty ratio formula is D=TON/(TON+TOFF), wherein D indicates duty ratio, TONWhen indicating conducting
Between, TOFFIndicate the turn-off time；Know average voltage U=D × V, wherein U indicates that average voltage, V indicate voltage peak；
Output high-accuracy voltage is adjusted by changing duty ratio.
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| CN105952426B (en) * | 2016-06-23 | 2018-03-09 | 华中科技大学 | A kind of de-plugging of well increasing device based on liquid electric pulse shock wave |
| CN107869342B (en) * | 2016-09-27 | 2020-05-19 | 华中科技大学 | Pipeline scale removal and rock stratum fracturing device based on liquid electric pulse shock wave |
| CN106437656A (en) * | 2016-12-12 | 2017-02-22 | 中国地质大学（北京） | Oil and gas reservoir permeation-increasing and plugging-releasing device based on liquid-electric effect |
| CN106761649A (en) * | 2017-02-28 | 2017-05-31 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | One kind is used for water injection well line pulse method for removing blockage |
| CN107124117A (en) * | 2017-07-11 | 2017-09-01 | 哈尔滨理工大学 | A kind of low-frequency electric pulse electric discharge device for de-plugging of well |
| MX2020003040A (en) * | 2017-09-26 | 2020-07-22 | Rocketfrac Services Ltd | Well stimulation apparatus and a method of use thereof. |
| CN109403937A (en) * | 2018-11-05 | 2019-03-01 | 清华四川能源互联网研究院 | A kind of blast wave generating apparatus of oil/gas well and well production increment method using shock wave |
| CN109594946A (en) * | 2018-12-13 | 2019-04-09 | 苏州峰极电磁科技有限公司 | Stifled system is dredged under a kind of electric pulse oil well |
| CN110331971A (en) * | 2019-08-05 | 2019-10-15 | 西安闪光能源科技有限公司 | A kind of reservoir reconstruction method of overlapping development horizontal well |
| US11955782B1 (en) | 2022-11-01 | 2024-04-09 | Typhon Technology Solutions (U.S.), Llc | System and method for fracturing of underground formations using electric grid power |
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