CN110112987A - Down-hole pumping unit direct current transmission control frequency-changing control system - Google Patents
Down-hole pumping unit direct current transmission control frequency-changing control system Download PDFInfo
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- CN110112987A CN110112987A CN201910321520.5A CN201910321520A CN110112987A CN 110112987 A CN110112987 A CN 110112987A CN 201910321520 A CN201910321520 A CN 201910321520A CN 110112987 A CN110112987 A CN 110112987A
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- circuit
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- inverter circuit
- pumping unit
- direct current
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- 238000005086 pumping Methods 0.000 title claims abstract description 32
- 230000005540 biological transmission Effects 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 claims abstract description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 21
- 238000007789 sealing Methods 0.000 claims description 20
- 229910052802 copper Inorganic materials 0.000 claims description 11
- 239000010949 copper Substances 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 7
- 239000013307 optical fiber Substances 0.000 claims description 6
- 239000003208 petroleum Substances 0.000 claims description 4
- 239000004519 grease Substances 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 9
- 238000011084 recovery Methods 0.000 abstract description 6
- 239000003921 oil Substances 0.000 description 28
- 230000008901 benefit Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 238000012856 packing Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 238000000151 deposition Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000003129 oil well Substances 0.000 description 3
- 239000001993 wax Substances 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Connector Housings Or Holding Contact Members (AREA)
Abstract
The invention belongs to down-hole pumping unit oil recovery technique fields, more particularly to a kind of down-hole pumping unit direct current transmission control frequency-changing control system, including rectification circuit, filter circuit, inverter circuit, control circuit and down-hole oil production pump assembly, inverter circuit is connect by cable with the motor, rectification circuit, filter circuit and the control circuit is arranged on ground, the inverter circuit and down-hole oil production pump assembly is set along in underground, the filter circuit is connected by direct current and the inverter circuit of underground, and the inverter circuit is encapsulated by encapsulating structure.Inverter circuit in frequency converter is creatively stripped out by the present invention from frequency converter, and inverter circuit and down-hole pumping unit are set along in underground, it is added significantly to the limit depth of setting of down-hole pumping unit, also influence of the cable to frequency converter study accuracy is substantially cut down, to be conducive to guarantee that the service life and Frequency Converter Control down-hole pumping unit tune of frequency converter and motor join effect.
Description
Technical field
The invention belongs to down-hole pumping unit oil recovery technique field more particularly to a kind of down-hole pumping unit direct current transmission control frequency conversion controls
System processed.
Background technique
Down-hole pumping unit oil recovery technique is a kind of common oil recovery technique, and down-hole pumping unit oil extraction system is mainly by three parts
Composition: underground part, the middle section of above ground portion and connection underground, ground.Wherein, underground part is that down-hole pumping unit recovers the oil
The core of technology is mainly made of motor and the pump head being driven by motor, and common pump head form has oil-submersible centrifugal pump, latent oil spiral shell
Bar pump, latent oil plunger pump etc..Above ground portion mainly includes controller switching equipment and frequency converter, and effect mainly supplies for the motor of underground
Electricity, and frequency control is carried out to motor.Middle section includes oil pipe and power cable, and oil pipe is used to crude oil being lifted to ground,
Power cable is used to connect the electrical equipment of ground and underground.Down-hole oil production pump assembly is the same as oil pipe together G.I.H, ground electricity
Source passes through controller switching equipment, frequency converter and power cable for electrical energy transportation to downhole electrical motor, so that motor is driven pump head rotation, by electric energy
It is converted into mechanical energy, the well liquid in oil well is given rise to ground.
Down-hole pumping unit oil recovery technique has clear advantage, and advantage is:
1) huge discharge adopts the major advantage that liquid is this oil production method, still, oil-submersible centrifugal pump in down-hole pumping unit at present
For huge discharge, submersible screw pump and latent oil plunger pump are middle small displacement.
2) easy to operate, convenient for management, in urban district, application has in beautifying the environment, reduce noise.
3) inclined shaft, horizontal well and offshore oil production can preferably be applied to.
4) the installation test devices such as down-hole pressure and temperature are easy, and are transmitted to ground for signal is tested by fiber optic cables
Face measures reading.
5) successively decrease or change to adapt to oil well output, converter plant can be used and adjust supply frequency to realize.
6) it is excused from a college course that the phase is longer, and oil well production timeliness is relatively high.
However, there is also obvious disadvantages for the technology:
In down-hole pumping unit oil extraction system, motor is connected by the frequency converter at least hundreds of meters of multicore cable and ground
Connect, down-hole pumping unit installation after, due to the length of cable is larger and cable in electricity be alternating current, cause cable that can have larger
Capacitive, cable is longer, and capacitive is bigger, meanwhile, motor can generate voltage transient spikes in start and stop moment in the cable.Long electricity
It is breakdown that the larger capacitive of cable with voltage transient spikes collective effect is easy cable, therefore, the depth of setting of down-hole pumping unit
It is to be limited by cable length, this largely affects the application range of down-hole pumping unit.
In order to eliminate because the too long bring cable of cable is easy breakdown problem, currently used technical solution is on ground
Sinusoidal filter or output reactance device are added in face, and this mode increases the depth of setting of down-hole pumping unit to a certain extent,
But with the increase of depth, the effect of sinusoidal filter or output reactance device is gradually deteriorated, meanwhile, increase sinusoidal filter or defeated
Reactor also produces new problem out: according to the working principle of frequency converter, frequency converter is pacified again after first installation or maintenance
When dress, it is necessary first to which the parameter of the motor first controlled it learns, in order to guarantee the parameter of electric machine that frequency converter learns
Accuracy, optimal state are that the cable that is connected directly frequency converter and motor and between frequency converter and motor is shorter.However,
In the prior art, it sinusoidal filter (or output reactance device) and is connected with the presence of long-distance cable of alternating current and will affect change
The accuracy of frequency device study, and the influence of sinusoidal filter (or output reactance device) and cable is superposition.Due to frequency converter
The accurate parameter of motor cannot be correctly received, cause frequency converter deviation occur to the control precision of motor, be not only unfavorable for
Guarantee the service life of frequency converter and motor, and will affect frequency converter and effect is joined to the control tune of down-hole pumping unit.
In addition, down-hole pumping unit oil recovery technique also needs to solve the problems, such as underground wax deposition as other oil production methods.It is single
Consider from the technical solution of processing wax deposition, is a very direct and simple and effective side by heating cable handling underground wax deposition
Method, but this method is applied to and obvious obstacle exists in the prior art: and heating cable can only be powered using two-phase power supply, and current
Frequency converter output is three-phase electricity, and the motor of underground is also three-phase motor, therefore for that must give up a phase when heating cable power supply,
This is bound to cause three-phase imbalance problem, and in order to which the motor to underground is protected, frequency converter does not allow three-phase injustice occur
The problem of weighing apparatus, (if allowing three-phase imbalance problem occur, once occurring three imbalances at downhole electrical motor, frequency converter just could not
Effectively identification electrical fault).Therefore, the mode for heating cable paraffin removal does not have feasibility on the basis of existing technology.
Summary of the invention
The present invention provides a kind of down-hole pumping unit direct current transmission control frequency-changing control system, is asked with solve to propose in the prior art
Topic.
Technical problem solved by the invention is realized using following technical scheme: the present invention provides a kind of down-hole pumping unit
Direct current transmission control frequency-changing control system, including rectification circuit, filter circuit, inverter circuit, control circuit and down-hole oil production pump assembly,
Power frequency supply successively generates the electricity with required voltage and frequency after the adjustment of rectification circuit, filter circuit and inverter circuit
Source, for the motor power supply being mounted in the down-hole oil production pump assembly of underground, control circuit is respectively to rectification circuit and inverter circuit
It is controlled, inverter circuit is connect by cable with the motor, the rectification circuit, filter circuit and control circuit setting
On ground, the inverter circuit and down-hole oil production pump assembly are set along in underground, the filter circuit by direct current with
The inverter circuit of underground connects, and the inverter circuit is encapsulated by encapsulating structure.
The control circuit is connected by optical fiber and the inverter circuit of underground, to realize the transmission of control signal.It is described
Encapsulating structure be connected to the lower end of motor.
The encapsulating structure includes top connection, cylinder and lower contact, and the upper end of top connection is provided with flange, lower contact
Lower end is provided with the petroleum pipeline external screw thread for meeting national standard specification, and the inverter circuit is arranged in the cylinder, cylinder
The upper and lower ends of body are blocked by upper and lower two end caps, are each provided with a long cable section of ingoing line connector on two end caps；
It is provided with step A on the inside of the barrel end, step B is provided on the outside of the end cap, by cylinder inboard wall, end
Copper ring is installed, the root of step A and step B are all provided in the ring seal space that cover outer wall, step A and step B are surrounded jointly
Be equipped with annular groove, on end cap apply towards cylinder axial force when, the upper and lower ends of copper ring are extruded into step A and platform respectively
In annular groove at rank B, so that end cap is fixed on cylinder, and by the gap sealing between end cap and cylinder；
The connection structure of the top connection and cylinder includes outer connector sleeve and interior connector sleeve, and the upper end of interior connector sleeve passes through outer
It is threadedly attached in the inside of top connection after the circular hole in connector sleeve center, so that top connection be connect with outer connector sleeve, and makes
Between top connection and outer connector sleeve can relative rotation, the lower end of the outer connector sleeve connect by screw thread with the cylinder, outer company
It is provided with step C on the inside of female connector, accompanies thrust bearing between step C and the end cap of cylinder upper end；
Connection structure between the lower contact and cylinder is identical with the connection structure between top connection and cylinder；
The cable aperture excessively that current supply cable passes through is provided on the side wall of the top connection and lower contact.
Gasket ring is provided between the thrust bearing and the step C.The inside of the cylinder is additionally provided with cooling fin, institute
Inverter circuit is stated to radiate by cooling fin.The inverter circuit is made of inverter module.It is filled in the encapsulating structure
Silicone grease.
The beneficial effects of the present invention are: rectification circuit, filter circuit, inverter circuit and control circuit are the bases of frequency converter
Inverter circuit in frequency converter is creatively stripped out by structure, the present invention from frequency converter, and by inverter circuit and underground
Oil extraction pump is set along there are two the benefits in underground, done so: on the one hand, the ac power supply method of ground and underground being become
Direct current supply mode, eliminates the capacitive of cable, solves the problems, such as cable breakdown, to be added significantly to the limit of down-hole pumping unit
Depth of setting；On the other hand, the present invention eliminates sinusoidal filtering by way of cancelling sinusoidal filter (or output reactance device)
Influence of the device (or output reactance device) to frequency converter study accuracy, substantially cuts further through the mode that Alternating Current Power Supply inversion of direct current is powered
Influence of the powered down cable to frequency converter study accuracy, to be conducive to guarantee the service life of frequency converter and motor and the section of frequency converter
It can effect.
In addition, connection heating cable just corresponds to add for motor since the present invention uses two-phase direct current to be underground power supply used
One small load, there is no three imbalance problems, more will not influence judgement of the frequency converter to electrical fault, to make
The technical solution of electric heating paraffin removal is smoothly implemented.
Detailed description of the invention
Fig. 1 is electrical block diagram of the invention；
Fig. 2 is the structural schematic diagram of the encapsulating structure；
Fig. 3 is the partial enlarged view in Fig. 2 at A；
Fig. 4 is the circuit structure block diagram of frequency converter in the prior art.
In figure: 1- top connection, 2- cylinder, 3- lower contact, the outer connector sleeve of 4-, connector sleeve in 5-, 6- end cap, 7- long cable section of ingoing line
Connector, 8- cable, 9- flange, 10- petroleum pipeline external screw thread, 11- copper ring, 12- step A, 13- step B, 14- step C, 15- thrust
Bearing, 16- gasket ring, 17- rectification circuit, 18- filter circuit, 19- inverter circuit, 20- inverter module, 21- cooling fin.
Specific embodiment
The present invention is described further below in conjunction with attached drawing:
The present embodiment includes rectification circuit 17, filter circuit 18, inverter circuit 19, control circuit and down-hole oil production pump machine
Group, power frequency supply, which successively generates after the adjustment of rectification circuit 17, filter circuit 18 and inverter circuit 19, has required voltage
With the power supply of frequency, for the motor power supply being mounted in the down-hole oil production pump assembly of underground, control circuit is respectively to rectification circuit
17 and inverter circuit 19 controlled, inverter circuit 19 is connect by cable 8 with the motor.The above are in the prior art normal
See structure, details are not described herein.
Rectification circuit 17, filter circuit 18 and the control circuit is arranged in ground, the inverter circuit 19 and well
Lower oil-extracting pump unit is set along in underground, and the filter circuit 18 is connected by direct current and the inverter circuit 19 of underground.It is whole
Current circuit 17, filter circuit 18, inverter circuit 19 and control circuit are the foundation structure of frequency converter, and the present invention will creatively become
Inverter circuit 19 in frequency device is stripped out from frequency converter, and inverter circuit 19 and down-hole oil production pump assembly are set along
Underground, there are two the benefits done so: on the one hand, the ac power supply method on ground and underground is become into direct current supply mode,
The capacitive of cable 8 is eliminated, 8 breakdown problem of cable is solved, to be added significantly to the limit depth of setting of down-hole pumping unit；It is another
Aspect, the present invention eliminate sinusoidal filter (or output reactance by way of cancelling sinusoidal filter (or output reactance device)
Device) to frequency converter study accuracy influence, further through Alternating Current Power Supply inversion of direct current power mode substantially cut down cable 8 to frequency conversion
Device learns the influence of accuracy, to be conducive to guarantee the service life of frequency converter and motor and the energy-saving effect of frequency converter
Infringement in order to avoid well liquid to inverter circuit 19, inverter circuit 19 need to encapsulate by encapsulating structure, to meet
Waterproof and bearing requirements.
The control circuit is connected by optical fiber and the inverter circuit 19 of underground, to realize the transmission of control signal, tool
When body is implemented, optical fiber can be compounded to form cable 8 with the electric wire for being used to connect ground and underground.
The encapsulating structure is connected to the lower end of motor.
Encapsulating structure includes top connection 1, cylinder 2 and lower contact 3, and the upper end of top connection 1 is provided with flange 9, so that encapsulation
Structure can be connected to motor by flange 9.The lower end of lower contact 3 is provided with the petroleum pipeline external screw thread for meeting national standard specification
10。
The inverter circuit 19 is arranged in the cylinder 2, and the upper and lower ends of cylinder 2 pass through upper and lower two end caps 6
It blocks, to provide the sealed environment of a waterproof pressure for inverter circuit 19.Be each provided on two end caps 6 cable into
Wire terminal 7, the cable 8 from ground are connect after being introduced in encapsulating structure by a long cable section of ingoing line connector 7 with inverter circuit 19,
Another cable 8 is drawn from inverter circuit 19 to draw from another long cable section of ingoing line connector 7, is then connected to the motor, and is motor
Power supply.
In addition, the long cable section of ingoing line connector 7 on electric equipment under ground in the prior art is arranged at the outside of equipment, it is this
The shortcomings that structure type is that long cable section of ingoing line connector 7 is easy damage of being collided with during going into the well.And in the present invention, by long cable section of ingoing line
The inside of encapsulating structure is arranged in connector 7, can effectively avoid long cable section of ingoing line connector 7 and is collided with damage.
For being arranged for down-hole oil production pump assembly and encapsulating structure with underground, since package unit is all mounted on well
Under, once breaking down, need whole tubing strings to place under repair, causes operating cost to increase too long with the off-time, therefore,
The sealing reliability of encapsulating structure is even more important.In the prior art, the sealing of downhole tool mostly uses greatly O-ring seal, this
Sealing ring is easy to be scratched by part when tool assembles, and is easily damaged failure when bearing high pressure, therefore, sealing reliability is not
Foot.And in the present invention, due to using special copper ring sealing structure, make the sealing reliability and bearing capacity of encapsulating structure
Absolute guarantee is obtained.
Specifically, being provided with step A12 on the inside of 2 end of cylinder in the present invention, the outside of the end cap 6 is set
It is equipped with step B13, is pacified in the ring seal space surrounded jointly by 2 inner wall of cylinder, 6 outer wall of end cap, step A12 and step B13
Equipped with copper ring 11, the root of step A12 and step B13 are provided with annular groove, apply the axial direction towards cylinder 2 on end cap 6
When power, the upper and lower ends of copper ring 11 are extruded into respectively in the annular groove at step A12 and step B13, so that end cap 6 is fixed
On cylinder 2, and by the gap sealing between end cap 6 and cylinder 2.Finally, upper and lower two end caps 6 and cylinder 2 define jointly
One for accommodating the reliable sealing space of the electric elements such as including inverter module 20.When it is implemented, can also be in the sealing
Silicone grease or other feasible charges are filled in space, to balance inside and outside differential pressure, are reached the burden for reducing sealing element, are increased sealing
The effect of the bearing capacity of space entirety.
Copper is a kind of metal for being often used to manufacture sealing element, and existing copper sealing element is shim form, in use,
Copper packing is clipped between two sealing surfaces in such a way that end face compresses, and sealing function is realized, however, copper packing seal form is held
Pressure energy power depends on pressing force, to guarantee to have biggish bearing capacity at sealing, just needs biggish pressing force, this is undoubtedly
Assembly difficulty is increased, particularly with as this sealing surface (diameter 100mm or so) being relatively large in diameter, pressing force meeting in the present invention
It is very big.And in the present invention, the biggish copper packing of seal face is become to the copper ring 11 of the lesser thin-walled of seal face, with copper packing phase
Than pressing force needed for realizing reliable sealing substantially reduces.Meanwhile filling up the annular groove after 11 compression deformation of copper ring,
So that copper ring 11 is had axial linkage function, so that cylinder 2 and end cap 6 are fixed together, is not readily separated the two.
The top connection 1 and the connection structure of cylinder 2 include outer connector sleeve 4 and interior connector sleeve 5, the upper end of interior connector sleeve 5
The inside of top connection 1 is threadedly attached in after the circular hole in outer 4 center of connector sleeve, thus by top connection 1 and outer connector sleeve 4
Connection, and make between top connection 1 and outer connector sleeve 4 can relative rotation, the lower end of the outer connector sleeve 4 passes through screw thread and the cylinder
Body 2 connects.When connecting the screw thread between outer connector sleeve 4 and cylinder 2, during turning outer connector sleeve 4, it is installed with cable 8
Top connection 1 and cylinder 2 it is opposing stationary, so that cable 8 be made to be unlikely to interfere the rotation of outer connector sleeve 4.
The inside of outer connector sleeve 4 is provided with step C14, accompanies thrust axis between the end cap 6 of 2 upper end step C14 and cylinder
Hold 15.For outer connector sleeve 4 toward during tightening on cylinder 2, outer connector sleeve 4 applies pressure to end cap 6 by thrust bearing 15, after
And the copper sheathing 11 is pushed to generate deformation, that is to say, that force the power of 11 deformation of copper sheathing from the screwing force of outer connector sleeve 4.With
Copper ring 11 be gradually extruded, the stiction between end cap 6 and cylinder 2 is gradually increased, and prevents end cap 6 with cylinder 2 from opposite
Rotation, and at this point, copper sheathing 11 is extruded into extreme position not yet, need to continue to turn outer connector sleeve 4.And thrust bearing 15
Setting make between outer connector sleeve 4 and end cap 6 always can swimmingly relative rotational sliding, to substantially reduce the stubborn of outer connector sleeve
Clamp force reduces the labor intensity of assembly difficulty and worker.
Connection structure between the lower contact 3 and cylinder 2 and the complete phase of connection structure between top connection 1 and cylinder 2
Together, details are not described herein.
The cable aperture excessively that current supply cable passes through is provided on the side wall of the top connection 1 and lower contact 3, due to long cable section of ingoing line
The junction of connector 7 and end cap 6 has had taken up seal approach, therefore crosses at cable aperture without taking seal approach.
It is provided with gasket ring 16 between the thrust bearing 15 and the step C14, the upside stress of thrust bearing 15 can be made
More evenly.
The inside of the cylinder 2 is additionally provided with cooling fin 21, and the inverter circuit 19 is radiated by cooling fin 21, specific material
Copper, aluminium alloy or other metal materials can be used in matter.
The inverter circuit 19 is made of inverter module 20, and inverter module 20 is that oil field is widely used in frequency converter
Inverter circuit comprising modules, it is compact-sized, it is sufficient to be placed in diameter and not allow more than in the encapsulating structure of 114mm.Make
For a kind of embodiment, the inverter module mostly uses IGBT, IEGT, GCT etc., certainly, can also take the circumstances into consideration according to actual needs
Select suitable inverter module.
The big feature of of the invention one is that the DC power supply on ground is led to underground, so that underground is had DC power supply, has
Reliable electric power guarantees.Based on These characteristics, it can also be arranged in the encapsulating structure and be used for temperature collection, pressure, flow
The sensor of equal signals, and collected signal back is passed in ground by the optical fiber.
In addition, other electronic equipments are also often arranged other than the matched equipment of setting oil extraction pump in underground, and according to existing
There is technology, these electronic equipments from charged pool often by being powered, since these electronic equipments are needed acquisition
For data from the underground of hundreds if not thousands of meters by being wirelessly transmitted to ground, radio transmitted power is larger, the cruising ability of battery
It is difficult to ensure that.However, passing through short range wireless transmission by the relay point for transmitting the encapsulating structure as a signal
The data that other electronic equipments generate under mode received well, are then uploaded to ground by the optical fiber.In this way, wireless transmission
Distance greatly shortens, and radio transmitted power substantially reduces, final to generate the effect for improving the cruising ability of battery.
Claims (7)
1. a kind of down-hole pumping unit direct current transmission control frequency-changing control system, including rectification circuit (17), filter circuit (18), inversion electricity
Road (19), control circuit and down-hole oil production pump assembly, power frequency supply successively pass through rectification circuit (17), filter circuit (18) and inverse
The power supply with required voltage and frequency is generated after the adjustment on power transformation road (19), to be mounted in the down-hole oil production pump assembly of underground
Motor power supply, control circuit respectively controls rectification circuit (17) and inverter circuit (19), and inverter circuit (19) passes through
Cable (8) is connect with the motor, it is characterised in that: rectification circuit (17), filter circuit (18) and the control circuit is set
It sets on ground, the inverter circuit (19) and down-hole oil production pump assembly are set along in underground, and the filter circuit (18) is logical
The inverter circuit (19) for crossing direct current and underground connects, and the inverter circuit (19) is encapsulated by encapsulating structure.
2. a kind of down-hole pumping unit direct current transmission control frequency-changing control system according to claim 1, it is characterised in that: described
Control circuit is connected by optical fiber and the inverter circuit (19) of underground, to realize the transmission of control signal.
3. a kind of down-hole pumping unit direct current transmission control frequency-changing control system according to claim 1, it is characterised in that: described
Encapsulating structure is connected to the lower end of motor；
The encapsulating structure includes top connection (1), cylinder (2) and lower contact (3), and the upper end of top connection (1) is provided with flange
(9), the lower end of lower contact (3) is provided with the petroleum pipeline external screw thread (10) for meeting national standard specification, the inverter circuit
(19) it is arranged in the cylinder (2), the upper and lower ends of cylinder (2) are blocked by upper and lower two end caps (6), two end caps
(6) a long cable section of ingoing line connector (7) is each provided on；
It is provided with step A (12) on the inside of cylinder (2) end, is provided with step B (13) on the outside of the end cap (6), by
Copper is installed in the ring seal space that cylinder (2) inner wall, end cap (6) outer wall, step A (12) and step B (13) are surrounded jointly
The root of ring (11), step A (12) and step B (13) are provided with annular groove, apply on end cap (6) towards cylinder (2)
When axial force, the upper and lower ends of copper ring (11) are extruded into respectively in the annular groove at step A (12) and step B (13), thus
End cap (6) is fixed on cylinder (2), and by the gap sealing between end cap (6) and cylinder (2)；
The connection structure of the top connection (1) and cylinder (2) includes outer connector sleeve (4) and interior connector sleeve (5), interior connector sleeve (5)
Upper end pass through the circular hole in outer connector sleeve (4) center after be threadedly attached in the inside of top connection (1), thus by top connection
(1) connect with outer connector sleeve (4), and make between top connection (1) and outer connector sleeve (4) can relative rotation, the outer connector sleeve (4)
Lower end connect with the cylinder (2) by screw thread, be provided with step C (14) on the inside of outer connector sleeve (4), step C (14) and
Thrust bearing (15) are accompanied between the end cap (6) of cylinder (2) upper end；
The connection structure between connection structure and top connection (1) and cylinder (2) between the lower contact (3) and cylinder (2) is complete
It is exactly the same；
The cable aperture excessively that current supply cable passes through is provided on the side wall of the top connection (1) and lower contact (3).
4. a kind of down-hole pumping unit direct current transmission control frequency-changing control system according to claim 1, it is characterised in that: described to push away
Gasket ring (16) are provided between power bearing (15) and the step C (14).
5. a kind of down-hole pumping unit direct current transmission control frequency-changing control system according to claim 1, it is characterised in that: the cylinder
The inside of body (2) is additionally provided with cooling fin (21), and the inverter circuit (19) is radiated by cooling fin (21).
6. a kind of down-hole pumping unit direct current transmission control frequency-changing control system according to claim 1, it is characterised in that: described
Inverter circuit (19) is made of inverter module (20).
7. a kind of down-hole pumping unit direct current transmission control frequency-changing control system according to claim 1, it is characterised in that: described
Silicone grease is filled in encapsulating structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910321520.5A CN110112987A (en) | 2019-04-22 | 2019-04-22 | Down-hole pumping unit direct current transmission control frequency-changing control system |
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| CN201910321520.5A CN110112987A (en) | 2019-04-22 | 2019-04-22 | Down-hole pumping unit direct current transmission control frequency-changing control system |
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| CN110112987A true CN110112987A (en) | 2019-08-09 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113595421A (en) * | 2021-06-08 | 2021-11-02 | 华中科技大学 | Modularized inverter-motor integrated system based on series H bridge and application |
| CN114593072A (en) * | 2020-12-04 | 2022-06-07 | 中国石油化工股份有限公司 | Electric submersible pump driving system |
| CN114598234A (en) * | 2020-12-04 | 2022-06-07 | 中国石油化工股份有限公司 | Electric submersible pump variable frequency driving system with heat dissipation sealing function |
-
2019
- 2019-04-22 CN CN201910321520.5A patent/CN110112987A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114593072A (en) * | 2020-12-04 | 2022-06-07 | 中国石油化工股份有限公司 | Electric submersible pump driving system |
| CN114598234A (en) * | 2020-12-04 | 2022-06-07 | 中国石油化工股份有限公司 | Electric submersible pump variable frequency driving system with heat dissipation sealing function |
| CN113595421A (en) * | 2021-06-08 | 2021-11-02 | 华中科技大学 | Modularized inverter-motor integrated system based on series H bridge and application |
| CN113595421B (en) * | 2021-06-08 | 2022-08-09 | 华中科技大学 | Modularized inverter-motor integrated system based on series H bridge and application |
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Application publication date: 20190809 |