CN104009648A - Plug removal device of oil delivery pipe of oil field and frequency control method - Google Patents
Plug removal device of oil delivery pipe of oil field and frequency control method Download PDFInfo
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Abstract
The invention provides a plug removal device of an oil delivery pipe of an oil field. The plug removal device comprises a first conversion device and a second conversion device, wherein the first conversion device is used for converting an alternating current into a direct current and has an isolation function, the second conversion device is used for converting the direct current output by the first conversion device into the alternating current, and the output end of the first conversion device is connected with the input end of the second conversion device. The first conversion device is adopted for converting the high-voltage low alternating current into the low-voltage high direct current, then the low-voltage high direct current is converted into the low-voltage high alternating current through the second conversion device which is an inverter, and the low-voltage high alternating current is applied to the oil delivery pipe, so that electrolytic corrosion caused by the direct current to the oil delivery pipe is avoided; meanwhile, ions in soil move under the action of the currents and are gradually attached to the outer wall of the oil delivery pipe, fine cracks are repaired, and the service life of the oil delivery pipe is prolonged. Due to the isolation function of the first conversion device, the plug removal device is safe and reliable in use. According to a power full-load control method of the second conversion device, influences of a skin effect are used, the frequency of the output alternating current is adjusted, the quantity of heat emitted by the oil delivery pipe is maximum, the optimal heating effect is achieved, and electric energy is used fully.
Description
[technical field]
This patent relates to Petroleum Production apparatus field, is specifically related to a kind of oil field petroleum pipeline de-plugging equipment and control method for frequency.
[background technology]
Be connected to the oil field petroleum pipeline of well head and measuring station, paraffin in oil, pitch, sulfide is As time goes on, more and more in the accumulation of petroleum pipeline inwall, in the time that oil well output is low, oil is thick or the oil pumper of well head damages, the oil flow of output is slow, and temperature is low, particularly at the low environment of temperature, paraffin in petroleum pipeline inwall or oil, pitch, sulfide condenses and causes petroleum pipeline to stop up.In patent CN201020238428.7, by 0～120V, the direct voltage of 0～1200A is applied on petroleum pipeline and heats, and realizes de-plugging.But in actual applications, in the time that the outer field insulating barrier of petroleum pipeline is aging or damage occurs slight crack or gap, the both positive and negative polarity of DC power supply is connected to oil transportation petroleum pipeline two ends, on the metal oil conduit at insulating barrier crack place, quite apply a DC power supply, petroleum pipeline, oil well and the earth have formed an electric charge loop, under DC power supply effect, petroleum pipeline is by electrolytic corrosion, and hole appears in pipeline at short notice, as Fig. 1.
[summary of the invention]
In order to address the above problem, the invention provides a kind of oil field petroleum pipeline de-plugging equipment.
The present invention adopts following technical scheme, structure oil field petroleum pipeline de-plugging equipment, comprise the first converting means that alternating current is transformed into direct current and plays buffer action, the direct current of the first converting means output is transformed into the second converting means of alternating current, the input of output termination second converting means of the first converting means.
Preferably, described the first converting means is Switching Power Supply, or is made up of transformer and rectifier.
Preferably, described the second converting means is inverter.
Preferably, described Switching Power Supply comprises: the first control module; The first high-frequency inversion module; Input rectifying filtration module, its input termination three-phase and four-line or phase three-wire three civil power, its output connects the input of the first high-frequency inversion module; Driver module, its input connects described the first control module, and its output connects described the first high-frequency inversion module; High frequency transformer, its primary coil is in parallel with the output of described the first high-frequency inversion module; Output rectification filter module, the parallel connection of secondary windings of its input and described high frequency transformer, its output connects described inverter; Open phase detection module, its input termination three-phase and four-line or phase three-wire three civil power, its output connects described the first control module; Power module, its input termination 220V alternating current, its output connects described the first control module.Preferably, described Switching Power Supply also comprises the first sampling module and/or the first display module being connected with described the first control module and/or connects three-phase and four-line or the first refrigerating module of phase three-wire three civil power.
Preferably, described Switching Power Supply also comprises harmonic wave electric capacity, and arbitrary output of described the first high-frequency inversion module is connected after described harmonic wave electric capacity and the parallel connection of primary windings of described high frequency transformer.
Preferably, described inverter comprises: the second control module; The second high-frequency inversion module, is connected with the output of described Switching Power Supply; Driver module, its input connects described the second control module, and its output connects described the second high-frequency inversion module; Power module, its input termination 220V alternating current, output connects described the second control module.
Preferably, described inverter also comprises the second sampling module of being connected with described the second control module and/or the second display module and or connects the second refrigerating module of 220V alternating current.
The present invention also provides a kind of power of oil field petroleum pipeline de-plugging equipment fully loaded control method, comprises the steps:
S1: the working temperature of the second sampling module sampling inverter, the input voltage of inverter and electric current, inverter flows to alternating voltage and the electric current of petroleum pipeline, and sampled data is inputted to the second control module;
S2: the second control module judges that whether inverter working temperature is overheated, inputs whether overvoltage, and overcurrent is under-voltage; As arbitrary condition judgment is, fault of converter, to step S7; As no in all conditions, arrive step S3;
S3: the second control module is according to the alternating voltage of petroleum pipeline and Current calculation petroleum pipeline length;
S4: the second control module flows to alternating voltage and the current data of petroleum pipeline according to the second sampling module sampling, calculate power output also and set point comparison; As power output is less than set point, to step S5; As power output is not less than set point, to step S7;
S5: judge that output voltage is the maximum operation value of inverter, arrives step S8 in this way; Arrive step S6 as no;
S6: judge that output current is the maximum operation value of inverter, arrives step S10 in this way; Arrive step S7 as no;
S7: second control module control the second display module shows the voltage, current value or the fault message that are applied to petroleum pipeline;
S8: second control module control the second high-frequency inversion module reduces the frequency of output current;
S9: the second control module judges that the voltage of petroleum pipeline is the maximum operation value of inverter, arrives step S8 in this way; Arrive step S7 as no;
S10: second control module control the second high-frequency inversion module improves the frequency of output current;
S11: the second control module judges that the electric current of petroleum pipeline is the maximum operation value of inverter, arrives step S10 in this way; Arrive step S7 as no;
Preferably, the fully loaded control method of the power of oil field petroleum pipeline de-plugging equipment is also included in before step S1, and alternating voltage and electric current with setpoint frequency when inverter is started working are applied to the step on petroleum pipeline.
From such scheme, adopt the first converting means to convert high-voltage great-current alternating current to low-voltage, high-current direct current, then being transformed into low-voltage, high-current alternating current through inverter is added on petroleum pipeline, solve the electrolytic corrosion that petroleum pipeline causes because of direct current, ion in soil moves under the effect of electric current simultaneously, be attached to gradually petroleum pipeline outer wall, repaired tiny slight crack, extended the life-span of petroleum pipeline; And the buffer action of the first converting means makes the use of product become safe and reliable.Control method for frequency in the second converting means, utilizes the impact of skin effect, adjusts the frequency of output AC electricity, makes petroleum pipeline caloric value maximum, heating effect the best, and electric energy is fully used.
[brief description of the drawings]
Fig. 1 petroleum pipeline applies DC power supply connection diagram;
Oil field de-plugging equipment scheme of installation in Fig. 2 embodiment mono-;
Switching Power Supply block diagram in Fig. 3 embodiment mono-;
Inverter block diagram in Fig. 4 embodiment mono-;
Input filter rectification circuit figure in Fig. 5 embodiment mono-;
Sample circuit figure in Fig. 6 embodiment mono-;
Lack detection circuit figure in Fig. 7 embodiment mono-;
Output rectifier and filter figure in Fig. 8 embodiment mono-;
Inverter frequency control flow chart in Fig. 9 embodiment mono-;
Oil field de-plugging equipment block scheme in Figure 10 embodiment bis-.
[embodiment]
In order to make technical scheme of the present invention and technique effect clearer, below in conjunction with drawings and Examples, the execution mode of this patent is described in detail.
Embodiment mono-:
As shown in Figure 1, the oil field petroleum pipeline de-plugging equipment in the present embodiment, comprises the first converting means and the second converting means, and the first converting means is Switching Power Supply, and the second converting means is inverter, and the output of Switching Power Supply is connected with the input of inverter.When petroleum pipeline 1 stops up, pull down the flange between oil well and petroleum pipeline 1, the screw rod of burn-oning at petroleum pipeline two ends, then the output cable of inverter is connected on screw rod.
Described Switching Power Supply comprises the first refrigerating module, input rectifying filtration module, the first high-frequency inversion module, 2 driver modules, high frequency transformer, output rectification filter module, the first sampling module, open phase detection module, the first display module, power module, the first control module, as shown in Figure 2.
Input rectifying filtration module input termination three-phase and four-line or phase three-wire three civil power, be used for filtering noise, alternating current is transformed into direct current and exports to the first high-frequency inversion module, and its circuit is shown in Fig. 5.Three-phase mains, after two three-phase commutation bridges in parallel, is transformed into direct current by electric main, through high-frequency film electric capacity filter away high frequency noise, exports to the first high-frequency inversion module through the direct current of inductance filtering low-frequency noise.
The first refrigerating module connects three-phase and four-line or phase three-wire three civil power, is used for to Switching Power Supply heat radiation, and can be air cooling system or the water cooling labyrinth system that powerful fan adds radiator.
Power module is transformed into the 15V direct voltage of small-power switching power-supply output the direct voltage of various different numerical value by voltage stabilizing chip, its input termination 220V alternating current, its voltage output end connects the first control module, driver module, the voltage input end of the first display module.Mini-switch power source model is P15E-5.
The first sampling module, open phase detection module, the first display module, driver module is all connected with the first control module.
The first sampling module is used for the working temperature of sampling switch power supply, input voltage, input current, the data that sample are exported to the first control module, the circuit of the first sampling module is shown in Fig. 6, the sampled data of temperature sensor, voltage sensor, current sensor accesses 2 pin of operational amplifier Uc1 after resistance R c2,3 pin of Uc1 and the indirect feedback resistance Rc3 of output pin 1 pin, and 1 pin connects and draws resistance R c4.The output of operational amplifier connects the first control module.
Open phase detection module is used for judging whether phase shortage of civil power, as phase shortage output logic signal give the first control module, open phase detection module circuit is shown in Fig. 7, and wherein every mutually full-wave rectifying circuit that electricity is made up of rectifier diode after current-limiting resistance is transformed into direct current input optocoupler, Qq1, Qq2, the output of Qq3 optocoupler is one another in series, and 1 pin of Qq1 connects power supply, and 3 pin of Qq3 connect pull down resistor, if any phase power failure, the 3 pin output low levels of Qq3.
The first display module is used for voltage and current or the fault message of display switch power supply output, can be liquid crystal or LED.
The full-bridge circuit that the first high-frequency inversion module is made up of four IGBTQ1, Q2, Q3, Q4 forms, and wherein the source electrode of Q1 connects the drain electrode of Q2, brachium pontis in formation, and the source electrode of Q3 connects the drain electrode of Q4, forms lower brachium pontis.The drain electrode of Q1 and the source electrode of Q2 are connected in parallel on the output of input rectifying filtration module, the drain electrode of Q3 and the source electrode of Q4 are connected in parallel on the output of input rectifying filtration module, in order to obtain better output waveform, after the drain electrode series connection harmonic wave electric capacity of Q1, with the drain electrode of Q3 and the parallel connection of primary windings of high frequency transformer, harmonic wave electric capacity is used for the harmonic wave in filtering output electrical signals.The model of Q1, Q2, Q3, Q4 is 2MBI300U4H-120.
Driver module receives the logic control signal of the first control module, controls the break-make of the first high-frequency inversion module.Driver module model is SKHI 23/12 (R), and each driver module connects two IGBT.Now above brachium pontis illustrates the connected mode of the second driver module and Q1, Q2.Driver module output pin X2.3, X3.3 connect respectively the grid of two Q1, Q2, and X2.5, X3.5 connect respectively the source electrode of Q1, Q2, and X2.1, X3.1 connect respectively the drain electrode of Q1, Q2.Lower brachium pontis is identical with upper brachium pontis with the connection of driver module.Driver module is used in overvoltage, under-voltage, protects 4 IGBT under overcurrent condition, converts the nonstandard square wave of the first control module output to standard square wave simultaneously and exports to 4 IGBT, controls their break-make.
The first control module is according to from the temperature of the first sampling module, and voltage and current data, if each data are all within the scope of security value (s), are exported control signal to 2 driver modules.The acp chip model of the first control module is LPC2214.
The secondary coil of high frequency transformer is in parallel with the input of output rectifier and filter.
Output rectification filter modular circuit is shown in Fig. 8, and after diode halfwave rectifier, again by capacitor filtering, output connects the input of inverter.
The course of work of Switching Power Supply is as follows: three-phase and four-line or phase three-wire three 380V civil power, change into high voltage direct current through input rectifying filtration module, and supply with the IGBT drain electrode of the first high-frequency inversion module.The first sampling module sampling voltage, electric current, temperature data is in normal range (NR) time, and the output of open phase detection module is not when phase shortage, the switching drive signal of the first control module control driver module output high frequency is to the grid of IGBT, and IGBT carries out break-make work with certain duty ratio, and output high-frequency ac voltage is to high frequency transformer, after high frequency transformer isolated buck, obtain low-voltage, high-current and exchange output, then obtain the output of low-voltage, high-current direct current through output rectification filter module.
Inverter comprises the second high-frequency inversion module, the second sampling module, 2 driver modules, the second display module, power module, the second refrigerating module, the second control module.
The full-bridge circuit that the second high-frequency inversion module is made up of four IGBTQ5, Q6, Q7, Q8 forms its circuit and connects identical with the first high-frequency inversion module, do not repeat them here, the VD VCC of Switching Power Supply connects the drain electrode of Q5 and Q7, GND connects the source electrode of G6 and G8, and Q5 drain electrode and Q7 drain as alternating current output.The model of Q5, Q6, Q7, Q8 is 2MBI600U2E-060.
The second sampling module is used for detecting the working temperature of inverter, and the input voltage of inverter and electric current are applied to electric current and voltage on petroleum pipeline.The circuit of the second sampling module is identical with the circuit of the first sampling module.
Driver module model is SKHI 23/12 (R), and each the second driver module connects two IGBT.Now above brachium pontis illustrates the connected mode of the second driver module and Q5, Q6.Driver module output pin X2.3, X3.3 connect respectively the grid of two Q5, Q6, and X2.5, X3.5 connect respectively the source electrode of Q5, Q6, and X2.1, X3.1 connect respectively the drain electrode of Q5, Q6.Lower brachium pontis is identical with upper brachium pontis with the connection of driver module.Driver module is used in overvoltage, under-voltage, protects 4 IGBT under overcurrent condition, converts the nonstandard square wave of the second control module output to standard square wave simultaneously and exports to 4 IGBT, controls their break-make.
The second display module is liquid crystal or LED, is used for showing the voltage and current or the fault message that are applied on petroleum pipeline, and accepts the current value of user's setting.Second source module is small-power switching power-supply, input termination alternating current 220V power supply,
The second refrigerating module connects 220V alternating current, is used for to inverter heat radiation, and can be air cooling system or the water cooling labyrinth system that powerful fan adds radiator.
Identical in power module and Switching Power Supply.
The second control module is according to the temperature from the second sampling module, and voltage and current data, export the control signal that changes frequency to 2 driver modules.The acp chip model of the second control module is LPC2200.
The course of work of inverter is as follows: the direct current of Switching Power Supply output, supply with the IGBT drain electrode of the second high-frequency inversion module.The second sampling module sampling voltage, electric current, temperature data is in normal range (NR) time, the switching drive signal of the second control module control driver module output high frequency is to the grid of IGBT, IGBT carries out break-make work with certain duty ratio, exports high-frequency alternating current.
Under alternating current environment, the alternating-current resistance of unit length wire,
Wherein, D=petroleum pipeline diameter, the relative copper of pr=resistance coefficient, f=ac frequency.
The average power P=UI/2=(I of single-phase alternating current
2× R
aC× L)/2=U
2/ (2 × R
aC), wherein, P=inverter power output, U=inverter output AC piezoelectric voltage amplitude, I=inverter output AC electricity current amplitude, L=petroleum pipeline length.Inverter output AC electricity frequency.
Can find out from petroleum pipeline resistance calculations formula, when the definite situation of petroleum pipeline length, resistance is directly proportional to frequency; When resistance is constant, frequency and length are inversely proportional to.
The direct current of Switching Power Supply converts low-voltage, high-current alternating current to through the second high-frequency inversion module under the control of the second control module.The energising initial stage, inverter is applied on petroleum pipeline with the large electric current alternating current of output LOW voltage of setpoint frequency, the second detection module detects electric current I and the petroleum pipeline voltage U on petroleum pipeline, and the skin effect of petroleum pipeline is not obvious, can calculate according to R=ρ * L/S=U/I the length of petroleum pipeline, according to the petroleum pipeline of different length, the second control module is according to formula
。Adjust the frequency of output AC electricity by controlling the break-make frequency of the second high-frequency inversion module.
Along with the generation of alternating current skin effect, petroleum pipeline resistance variations, in order to make heating effect the best of petroleum pipeline, just needs to ensure maximum utilization of power output of inverter.Petroleum pipeline is longer, and resistance is larger, and the electric current on petroleum pipeline is less than maximum, and voltage is maximum, needs to reduce frequency, reduces petroleum pipeline resistance; Petroleum pipeline is shorter, and resistance is less, and the electric current on petroleum pipeline is maximum, and voltage is less than maximum, needs to improve frequency, improves the resistance of petroleum pipeline.
The second control module samples voltage and current according to the second sampling module and calculates power output, judge power output and set value of the power, as be less than set point, judge again output AC piezoelectric voltage and inverter maximum working voltage, if output AC piezoelectric voltage is maximum, reduce output AC electricity frequency, improve output current, just stop reducing at once output AC electricity frequency until output voltage is less than maximum.If output AC piezoelectric voltage is not maximum, judgement output output AC electric current and inverter maximum operating currenbt, if output AC electric current is maximum, improve output AC electricity frequency, improve output voltage, just stop improving at once output AC electricity frequency until output current is less than maximum.
In the time that power output is not less than set value of the power or fault of converter, second control module control the second display module shows output current, magnitude of voltage, the data such as fault message.
The FREQUENCY CONTROL flow chart of inverter is shown in Figure 10.
Embodiment bis-:
See Fig. 9, the first converting means of the oil field petroleum pipeline de-plugging equipment in the present embodiment is made up of isolator and rectifier, the second converting means is inverter, isolator input termination three-phase mains or single-phase alternating current, the input of output termination rectifier, the output of rectifier connects the input of inverter.Isolator is transformed into three-phase mains or single-phase alternating current the alternating current of low pressure, an and buffer action, can be induction voltage regulator or transformer, the transformer of three-phase mains application is the induction voltage regulator in Scott Transformer or patent CN201020238428.7, and the transformer of single-phase alternating current application is common transformer.Rectifier is transformed into direct current by low-voltage AC and exports to inverter, and the implementation of inverter and control method for frequency are identical with embodiment mono-.
The preferred embodiment that the foregoing is only this patent, is not limited to this patent, and for a person skilled in the art, this patent can have various modifications and variations.All within the spirit and principle of this patent, any amendment of doing, be equal to replacement, improvement etc., within all should being included in the protection range of this patent.
Claims (10)
1. oil field petroleum pipeline de-plugging equipment, it is characterized in that comprising the first converting means that alternating current is transformed into direct current and plays buffer action, the direct current of the first converting means output is transformed into the second converting means of alternating current, the input of output termination second converting means of the first converting means.
2. according to the oil field petroleum pipeline de-plugging equipment in claim 1, it is characterized in that described the first converting means is Switching Power Supply, or formed by transformer and rectifier.
3. according to the oil field petroleum pipeline de-plugging equipment in claim 1, it is characterized in that described the second converting means is inverter.
4. according to the oil field petroleum pipeline de-plugging equipment in claim 2, it is characterized in that described Switching Power Supply comprises:
The first control module;
The first high-frequency inversion module;
Input rectifying filtration module, its input termination three-phase and four-line or phase three-wire three civil power, its output connects the input of the first high-frequency inversion module;
Driver module, its input connects described the first control module, and its output connects described the first high-frequency inversion module;
High frequency transformer, its primary coil is in parallel with the output of described the first high-frequency inversion module;
Output rectification filter module, the parallel connection of secondary windings of its input and described high frequency transformer, its output connects described inverter;
Open phase detection module, its input termination three-phase and four-line or phase three-wire three civil power, its output connects described the first control module;
Power module, its input termination 220V alternating current, its output connects described the first control module.
5. according to the oil field petroleum pipeline de-plugging equipment in claim 4, it is characterized in that described Switching Power Supply also comprises the first sampling module and/or the first display module being connected with described the first control module and/or connects three-phase and four-line or the first refrigerating module of phase three-wire three civil power.
6. according to the oil field petroleum pipeline de-plugging equipment in claim 4, it is characterized in that described Switching Power Supply also comprises harmonic wave electric capacity, arbitrary output of described the first high-frequency inversion module is connected after described harmonic wave electric capacity and the parallel connection of primary windings of described high frequency transformer.
7. according to the oil field petroleum pipeline de-plugging equipment in claim 3, it is characterized in that described inverter comprises:
The second control module;
The second high-frequency inversion module, is connected with the output of described Switching Power Supply;
Driver module, its input connects described the second control module, and its output connects described the second high-frequency inversion module;
Power module, its input termination 220V alternating current, output connects described the second control module.
8. according to the oil field petroleum pipeline de-plugging equipment in claim 7, it is characterized in that described inverter also comprises the second sampling module of being connected with described the second control module and/or the second display module and or connects the second refrigerating module of 220V alternating current.
9. a control method for frequency for the oil field petroleum pipeline de-plugging equipment in claim 8, is characterized in that comprising the steps:
S1: the working temperature of the second sampling module sampling inverter, the input voltage of inverter and electric current, inverter flows to alternating voltage and the electric current of petroleum pipeline, and sampled data is inputted to the second control module;
S2: the second control module judges that whether inverter working temperature is overheated, inputs whether overvoltage, and overcurrent is under-voltage; As arbitrary condition judgment is, fault of converter, to step S7; As no in all conditions, arrive step S3;
S3: the second control module is according to the alternating voltage of petroleum pipeline and Current calculation petroleum pipeline length;
S4: the second control module flows to alternating voltage and the current data of petroleum pipeline according to the second sampling module sampling, calculate power output also and set point comparison; As power output is less than set point, to step S5; As power output is not less than set point, to step S7;
S5: judge that output voltage is the maximum operation value of inverter, arrives step S8 in this way; Arrive step S6 as no;
S6: judge that output current is the maximum operation value of inverter, arrives step S10 in this way; Arrive step S7 as no;
S7: second control module control the second display module shows the voltage, current value or the fault message that are applied to petroleum pipeline;
S8: second control module control the second high-frequency inversion module reduces the frequency of output current;
S9: the second control module judges that the voltage of petroleum pipeline is the maximum operation value of inverter, arrives step S8 in this way; Arrive step S7 as no;
S10: second control module control the second high-frequency inversion module improves the frequency of output current;
S11: the second control module judges that the electric current of petroleum pipeline is the maximum operation value of inverter, arrives step S10 in this way; Arrive step S7 as no.
10. according to the fully loaded control method of the power of the oil field petroleum pipeline de-plugging equipment in claim 9, characterized by further comprising before step S1, alternating voltage and electric current with setpoint frequency when inverter is started working are applied to the step on petroleum pipeline.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111181402A (en) * | 2018-11-12 | 2020-05-19 | 航天科工惯性技术有限公司 | Anti-scaling power supply equipment for underground petroleum pipeline |
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| CN2158152Y (en) * | 1993-03-18 | 1994-03-02 | 吴玉臣 | Multi-function industrial frequency electric heating pawer supply unit for petroleum |
| CN202598136U (en) * | 2012-06-07 | 2012-12-12 | 北京石大新锐石油科技有限公司 | Pipeline blockage removal system |
| CN203590046U (en) * | 2013-12-16 | 2014-05-07 | 哈尔滨华富科技有限公司 | AC stabilized power supply for mining |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201915904U (en) * | 2010-11-17 | 2011-08-03 | 山东拓普石油装备有限公司 | Electric heating and efficient paraffin removal and well cleanup device for variable frequency electromagnetic oil pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2158152Y (en) * | 1993-03-18 | 1994-03-02 | 吴玉臣 | Multi-function industrial frequency electric heating pawer supply unit for petroleum |
| CN202598136U (en) * | 2012-06-07 | 2012-12-12 | 北京石大新锐石油科技有限公司 | Pipeline blockage removal system |
| CN203590046U (en) * | 2013-12-16 | 2014-05-07 | 哈尔滨华富科技有限公司 | AC stabilized power supply for mining |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111181402A (en) * | 2018-11-12 | 2020-05-19 | 航天科工惯性技术有限公司 | Anti-scaling power supply equipment for underground petroleum pipeline |
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