CN116265057A - Automatic dredging and filtering system for crude oil gathering and conveying pipeline and using method thereof - Google Patents

Automatic dredging and filtering system for crude oil gathering and conveying pipeline and using method thereof Download PDF

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Publication number
CN116265057A
CN116265057A CN202111542099.4A CN202111542099A CN116265057A CN 116265057 A CN116265057 A CN 116265057A CN 202111542099 A CN202111542099 A CN 202111542099A CN 116265057 A CN116265057 A CN 116265057A
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China
Prior art keywords
filter
pressure sensor
dredging
crude oil
electric valve
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Pending
Application number
CN202111542099.4A
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Chinese (zh)
Inventor
莫光明
宋丽梅
郭晓兵
刘宏云
马龙那
匡凯
何林文
贾福斌
袁少冬
白荆
王海石
赵辉
陶岩
葛东文
张京婧
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Petrochina Co Ltd
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Petrochina Co Ltd
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Filing date
Publication date
Application filed by Petrochina Co Ltd filed Critical Petrochina Co Ltd
Priority to CN202111542099.4A priority Critical patent/CN116265057A/en
Publication of CN116265057A publication Critical patent/CN116265057A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B01D29/03—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements self-supporting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/60—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/60—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration
    • B01D29/606—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration by pressure measuring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/20—Controlling water pollution; Waste water treatment
    • Y02A20/204—Keeping clear the surface of open water from oil spills

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtration Of Liquid (AREA)

Abstract

The invention discloses an automatic dredging and filtering system of a crude oil gathering and conveying pipeline and a use method thereof, wherein the system comprises a non-pressure-relief dredging filter, a controller, an electric valve and a dirt receiving device; the non-pressure relief dredging filter is arranged on the crude oil collecting and conveying pipeline and comprises a filter body, a compression cover, a plate seat, a filter plate, a first pressure sensor and a second pressure sensor; the first pressure sensor is arranged on the liquid inlet pipe, the second pressure sensor is arranged on the liquid outlet pipe, one end of the electric valve is arranged at the end of the dredging pipe, and the other end of the electric valve is in sealing connection with the inlet end of the sewage receiving device through the sewage discharging pipe; the controller comprises a PLC controller, a 4G data transmission device and an alarm; the automatic dredging and filtering system for the crude oil collecting and conveying pipeline can realize automatic dredging in a collecting and conveying process and prevent the damage of a conveying pump and equipment caused by unsmooth filter.

Description

Automatic dredging and filtering system for crude oil gathering and conveying pipeline and using method thereof
Technical Field
The invention relates to the technical field of ground engineering gathering and transportation, in particular to an automatic dredging and filtering system for a crude oil gathering and transportation pipeline and a use method thereof.
Background
Filters are an indispensable plumbing accessory in crude oil processing and tubing processes. Typically before the fluid medium enters the pump; the crude oil medium flows through the pipeline before the flowmeter. When the medium flows through the filter, the solid impurities below a certain particle size in the pipeline medium are filtered through the interception of the filter screen, so that the purposes of protecting equipment and instruments are achieved. At present, basket type filter screens are adopted for the filters used on site, so that the filter screens are often unsmooth, and the operations of disassembling, cleaning and installing the filter screens are executed after the reverse flow and the emptying operation are frequently carried out. The staff intensity of labour increases, and the operational risk is high, and current filter screen is unsmooth, only relies on the timely discovery of operating staff to handle in time, if can not clear away the filter screen in time, can cause whole pipe to input the inlet pressure to rise, causes the differential pressure increase of filter screen both sides, and the filter screen is in case taking place to impale under high differential pressure, still can cause the filth to get into in the pump, damages the pump, this seriously hinders unmanned on duty automatic high-efficient implementation.
At present, sampling, remote transmission and warning of the inlet and outlet pressure of the filter can be realized on the production site. The following drawbacks remain: 1. the backflow process in the filter screen removing process is complicated in the emptying and filter screen taking process, and the labor intensity is high; 2. when no person keeps the valve, timely dredging cannot be realized, and the hidden danger of damaging the filter screen due to high pressure difference exists; 3. the inlet and outlet valves of the filter are frequently opened and closed, and when leakage occurs, the emptying dredging task cannot be completed.
Disclosure of Invention
The invention aims to provide an automatic dredging and filtering system for a crude oil collecting and conveying pipeline, which can automatically remove dirt in a filter.
The invention further aims to provide a using method of the automatic dredging and filtering system for the crude oil collecting and conveying pipeline.
For this purpose, the technical scheme of the invention is as follows:
an automatic dredging and filtering system for a crude oil collecting and conveying pipeline comprises a non-pressure-relief dredging filter, a controller, an electric valve and a sewage receiving device; wherein,,
the non-pressure relief dredging filter is arranged on the crude oil collecting and conveying pipeline and comprises a filter body, a compression cover, a plate seat, a filter plate, a first pressure sensor and a second pressure sensor; the filter body is provided with a hollow cavity, the top end of the filter body is provided with a compression cover mounting opening, the bottom end of the filter body is provided with a dredging pipe communicated with the hollow cavity, and the opposite side wall of the filter body is respectively provided with a liquid inlet pipe and a liquid outlet pipe communicated with the hollow cavity; the filter plate is embedded on an annular step arranged at the annular inner edge of the upper plate surface of the plate seat; the compression cover is covered and sealed and fixed at the top end opening of the filter body and an arc-shaped inclined plate formed by extending downwards from the bottom surface of the cover body; the arc-shaped inclined plate extends downwards obliquely from the bottom surface of the cover body, the bottom end of the arc-shaped inclined plate is propped against the edge of the bottom side of the filter plate, and a liquid passing hole which is coaxially arranged with the liquid outlet end is formed in the arc-shaped inclined plate, and the aperture of the liquid passing hole is matched with the inner diameter of the liquid outlet end; the hollow cavity is divided into a liquid inlet cavity A and a liquid outlet cavity B by a plate seat, a filter plate and an arc-shaped inclined plate which are arranged in a superposition way; a plurality of filter holes are uniformly distributed on the filter plate;
the first pressure sensor is arranged on the liquid inlet pipe to detect the pressure value of the fluid in the liquid inlet pipe; the second pressure sensor is arranged on the liquid outlet pipe to detect the pressure value of the fluid in the liquid outlet pipe; one end of the electric valve is arranged at the end of the dredging pipe, and the other end of the electric valve is in sealing connection with the inlet end of the sewage receiving device through a sewage discharging pipe;
when the electric valve is in an open state, dirt attached to the filter plate at one side of the liquid inlet cavity A flows into the dirt receiving device through the drain pipe under the action of pressure difference; the dirt stored in the dirt receiving device is cleaned manually at regular intervals;
the controller comprises a PLC controller, a 4G data transmission device and an alarm; the PLC is connected with the 4G data transmission device and the alarm; the 4G data transmission device is respectively connected with the first pressure sensor, the second pressure sensor and the electric valve in a wireless way; the PLC controller, the 4G data transmission device and the alarm are connected with an external power supply to supply power.
Further, the aperture of the filter holes formed on the filter plate is 3-8 mm, and the aperture ratio is 80%.
Further, flanges are arranged at the ports of the liquid inlet pipe and the liquid outlet pipe.
The application method of the automatic dredging and filtering system adopting the crude oil gathering and conveying pipeline comprises the following steps:
step A: the PLC is wirelessly connected with the first pressure sensor, the second pressure sensor and the electric valve through a 4G data transmission device, and meanwhile, the pressure value transmitted by the first pressure sensor is set to be P 1 Setting the pressure value transmitted by the second pressure sensor as P 2 And sets a threshold value DeltaP=P for controlling the opening of the electric valve by the PLC controller 1 -P 2 More than 0.3MPa, and after each opening, keeping the opening time for at least 10s, the PLC controller controls the powerClosing the movable valve;
and (B) step (B): the PLC is connected with the alarm, the number of times that the electric valve is opened is defined as N, and the threshold value N of the alarm which is controlled by the PLC to send out an alarm is set to be more than or equal to 1 so as to prompt a worker to treat the dirt stored in the dirt receiving device.
Compared with the prior art, the automatic dredging and filtering system for the crude oil gathering and conveying pipeline can realize the requirement of unmanned field management and control, can finish automatic dredging according to a pressure difference value by being installed on the crude oil gathering and conveying pipeline, prevent the damage of a conveying pump and related equipment caused by unsmooth filter, and simultaneously reduce the labor cost.
Drawings
FIG. 1 is a schematic diagram of an automatic dredging and filtering system for crude oil collecting and conveying pipelines;
FIG. 2 is a side view of a non-pressure relief dredging filter of the crude oil gathering and transportation pipeline automatic dredging filter system of the invention;
FIG. 3 is a front view of a no-pressure relief dredging filter of the crude oil gathering and transportation pipeline automatic dredging filter system of the invention;
FIG. 4 is a cross-sectional view of a no-pressure relief dredging filter of the crude oil gathering and transportation pipeline automatic dredging filter system of the invention;
FIG. 5 is a schematic diagram of the structure of a compression cover of a non-pressure relief dredging filter of the crude oil gathering and transportation pipeline automatic dredging filter system of the invention;
FIG. 6 is a schematic diagram of the structure of a filter plate of a non-pressure relief dredging filter of the crude oil collecting and transporting pipeline automatic dredging filter system of the invention;
FIG. 7 is a flow chart of a method of using the automatic dredging filter system for crude oil gathering and transportation pipeline of the present invention.
Detailed Description
The invention will now be further described with reference to the accompanying drawings and specific examples, which are in no way limiting.
Example 1
As shown in fig. 1, the automatic dredging and filtering system of the crude oil collecting and conveying pipeline comprises a non-pressure-relief dredging and filtering device 1, a controller 2, an electric valve 3 and a sewage receiving device 4.
As shown in fig. 2 to 4, the non-pressure relief dredging filter 1 is installed on a crude oil collecting and conveying pipeline and comprises a filter body, a compression cover 16, a plate seat 17, a filter plate 18, a first pressure sensor 19 and a second pressure sensor 20; wherein,,
the filter body is provided with a hollow cavity 14, the top end of the filter body is provided with a compression cover mounting opening, the bottom end of the filter body is provided with a dredging pipe 13 communicated with the hollow cavity 14, and the opposite side wall of the filter body is respectively provided with a liquid inlet pipe 11 and a liquid outlet pipe 12 communicated with the hollow cavity 14; in order to facilitate the connection with an external pipeline, flanges 15 are arranged at the ports of the liquid inlet pipe 11 and the liquid outlet pipe 12, so that the liquid inlet pipe 11 and the liquid outlet pipe 12 are respectively connected with two pipe ends disconnected on a crude oil collecting and conveying pipeline through the flanges, and further crude oil is subjected to dredging treatment through the non-pressure relief dredging filter 1 in the collecting and conveying process;
the plate seat 17 is an annular body, and an annular step is concavely formed at the inner edge of the annular surface on one side of the plate seat; wherein, the outer diameter of the plate seat 17 is adapted to the inner diameter of the hollow cavity 14 of the filter body, so that the plate seat 17 is obliquely arranged in a way that one side of an annular step is upward, and the outer wall of the plate seat is welded and fixed on the inner wall of the filter body; the shape and the size of the annular step are adapted to those of the filter plate 18, so that the filter plate 18 can be obliquely arranged, and the edge of the filter plate is embedded and press-fit on the annular step of the plate seat 17;
the filter plate 18 is obliquely arranged and fixed between the plate seat 17 and the arc-shaped inclined plate, and divides the hollow cavity 14 into a liquid inlet cavity A and a liquid outlet cavity B; a plurality of filter holes 181 are uniformly distributed on the filter plate 18; wherein the aperture ratio of the filter plate 18 and the aperture of the upper filter hole thereof are set according to the particle size and the allowable flow rate of the allowable passing fluid; in the embodiment, the caliber of the liquid inlet end and the caliber of the liquid outlet end are 80mm; the aperture of the filter holes 181 formed on the filter plate 18 is 5mm, the aperture ratio is 80%, the requirements of pipeline design flow through are met, and the filter can prevent substances with the particle size larger than 5mm from passing through, so that medium filtration is realized;
as shown in fig. 5, the pressing cover 16 is formed by a cover body and an arc-shaped sloping plate extending downwards from the bottom surface of the cover body; specifically, the cover body is a circular plate, is covered and installed at the top end opening of the filter body, and is fixed on the filter body through a plurality of screws uniformly distributed along the circumferential direction so as to close the top end opening; the arc-shaped inclined plate extends downwards obliquely from the bottom surface of the cover body to form and is integrally formed with the cover body, the bottom end of the arc-shaped inclined plate is propped against the bottom side edge of the filter plate 18, a liquid passing hole is formed in the arc-shaped inclined plate, the liquid passing hole and the liquid outlet end are coaxially arranged, and the aperture of the liquid passing hole is consistent with the inner diameter of the liquid outlet end.
The first pressure sensor 19 is arranged in a mounting port formed in the pipe wall near the port of the liquid inlet pipe 11 and is used for detecting the pressure value of the fluid in the liquid inlet pipe 11; the second pressure sensor 20 is arranged in a mounting port formed on the pipe wall near the port of the liquid outlet pipe 12 and is used for detecting the pressure value of the fluid in the liquid outlet pipe; in the working state, whether excessive crude oil impurities are deposited and adhered on the filter plate or not is determined by sensing the pressure difference between the first pressure sensor 19 and the second pressure sensor 20 so as to judge whether dredging is needed or not;
one end of the electric valve 3 is arranged at the pipe end of the dredging pipe 13 to control the opening/closing of the dredging pipe 13, and the electric valve 3 for controlling the opening/closing of the pipe orifice of the dredging pipe 13 is arranged on the opening; the other end of the electric valve 3 is connected with the inlet end of the sewage receiving device 4 in a sealing way through a sewage discharge pipe so as to prevent leakage;
the dirt receiving device 4 is a closed box body, a suction pump can be selectively arranged in the box body, and when the electric valve 3 is in an opened state, dirt attached to the filter plate 18 at one side of the liquid inlet cavity A flows into the dirt receiving device 4 through a drain pipe under the action of pressure difference; the dirt stored in the dirt receiving device 4 is cleaned manually at regular intervals;
the controller 2 is provided with a control center which comprises a PLC controller, a 4G data transmission device and an alarm; correspondingly, the electric valve 3 adopts a wireless electric valve with a wireless transmission module, and the first pressure sensor and the second pressure sensor both adopt wireless pressure sensors with wireless transmission modules; the PLC is connected with the 4G data transmission device and the alarm; the 4G data transmission device is connected with the first pressure sensor, the second pressure sensor and the electric valve 3 respectively and is used for receiving pressure signals sent by the first pressure sensor and the second pressure sensor in real time and outputting valve opening signals and valve closing signals to the electric valve according to whether the pressure difference signals calculated in real time reach a preset threshold value or not; the alarm triggers an alarm after the PLC controls the electric valve 3 to be opened for a set number of times, and prompts workers to treat the dirt stored in the dirt receiving device 4; the PLC controller, the 4G data transmission device and the alarm are connected with an external power supply to supply power.
Example 2
As shown in fig. 7, a method for implementing automatic dredging in the crude oil transportation process by adopting the crude oil collecting and transporting pipeline automatic dredging filtration system of embodiment 1 specifically includes the following steps:
step A: the PLC is wirelessly connected with the first pressure sensor, the second pressure sensor and the electric valve through a 4G data transmission device, and meanwhile, the pressure value transmitted by the first pressure sensor is defined as P 1 The pressure value transmitted by the second pressure sensor is P 2 And the threshold value of the PLC controller for controlling the opening of the electric valve is set to be deltaP=P 1 -P 2 More than 0.3MPa, and after each time of opening, the electric valve is controlled to be closed by the PLC controller after the opening time is kept for at least 10 s;
and (B) step (B): the PLC controller is connected with the alarm, the number of times that the electric valve is opened is defined as N, and the threshold value N for the PLC controller to control the alarm to give out an alarm is set as 1, so that workers are prompted to process the dirt stored in the dirt receiving device 4.
The automatic dredging and filtering system for the crude oil collecting and conveying pipeline has the following working process that the original automatic dredging is realized:
under normal working conditions, crude oil flows into the chamber A from the liquid inlet pipe of the non-pressure-relief dredging filter in the flowing process of the collecting and conveying pipeline, impurities in the crude oil are blocked at the filter plate when the crude oil passes through the filter plate, and the crude oil flows out from the liquid outlet end and enters the collecting and conveying pipeline again after passing through the chamber B so as to ensure that the crude oil in the collecting and conveying pipeline meets the conveying requirement; in the process, when the PLC receives that the pressure signal difference value of the first pressure sensor and the second pressure sensor exceeds a set threshold value, the PLC controls the electric valve to be opened, and the electric valve is automatically closed after the opening time lasts for 10 seconds, so that dredging work is completed; when the number of times that the electric valve is opened exceeds a set threshold, the PLC controller controls the alarm to give an alarm to prompt an operator to remove dirt in the dirt receiving device as soon as possible.

Claims (4)

1. An automatic dredging and filtering system of a crude oil gathering and conveying pipeline is characterized by comprising a non-pressure-relief dredging filter (1), a controller (2), an electric valve (3) and a sewage receiving device (4); wherein,,
the non-pressure relief dredging filter (1) is arranged on a crude oil collecting and conveying pipeline and comprises a filter body, a compression cover (16), a plate seat (17), a filter plate (18), a first pressure sensor (19) and a second pressure sensor (20); the filter body is provided with a hollow cavity (14), the top end of the filter body is provided with a compression cover mounting opening, the bottom end of the filter body is provided with a dredging pipe (13) communicated with the hollow cavity (14), and the opposite side wall of the filter body is respectively provided with a liquid inlet pipe (11) and a liquid outlet pipe (12) communicated with the hollow cavity (14); the plate seat (17) is an annular body which is obliquely arranged and fixed in the hollow cavity (14), and the filter plate (18) is embedded on an annular step arranged at the annular inner edge of the upper plate surface of the plate seat (17); the pressing cover (16) is provided with a cover body at the top end opening of the filter body and an arc-shaped inclined plate which is formed by extending downwards from the bottom surface of the cover body in a covering and sealing manner; the arc-shaped inclined plate extends downwards obliquely from the bottom surface of the cover body, the bottom end of the arc-shaped inclined plate is propped against the edge of the bottom side of the filter plate (18), and a liquid passing hole which is coaxially arranged with the liquid outlet end is formed in the arc-shaped inclined plate, and the aperture of the liquid passing hole is matched with the inner diameter of the liquid outlet end; the hollow cavity (14) is divided into a liquid inlet cavity A and a liquid outlet cavity B by a plate seat (17), a filter plate (18) and an arc-shaped inclined plate which are arranged in a superposition way; a plurality of filter holes are uniformly distributed on the filter plate (18);
the first pressure sensor (19) is arranged on the liquid inlet pipe (11) to detect the pressure value of the fluid in the liquid inlet pipe (11); the second pressure sensor (20) is arranged on the liquid outlet pipe (12) to detect the pressure value of the fluid in the liquid outlet pipe; one end of the electric valve (3) is arranged at the end of the dredging pipe (13), and the other end is connected with the inlet end of the sewage receiving device (4) in a sealing way through a sewage discharging pipe;
the controller (2) comprises a PLC controller, a 4G data transmission device and an alarm; the PLC is connected with the 4G data transmission device and the alarm; the 4G data transmission device is respectively connected with the first pressure sensor, the second pressure sensor and the electric valve (3) in a wireless way; the PLC controller, the 4G data transmission device and the alarm are connected with an external power supply to supply power.
2. The automatic dredging and filtering system for crude oil collecting and conveying pipeline according to claim 1, wherein the aperture of the filtering holes formed on the filter plate (18) is 3-8 mm, and the aperture ratio is at least 80%.
3. The automatic dredging and filtering system for crude oil collecting and conveying pipeline according to claim 1, wherein flanges (15) are arranged at ports of the liquid inlet pipe (11) and the liquid outlet pipe (12).
4. A method of using an automatic dredging filtration system employing a crude oil gathering and transportation pipeline as described in any one of claims 1 to 3, comprising:
step A: the PLC is wirelessly connected with the first pressure sensor, the second pressure sensor and the electric valve through a 4G data transmission device, and meanwhile, the pressure value transmitted by the first pressure sensor is defined as P 1 The pressure value transmitted by the second pressure sensor is P 2 And the threshold value of the PLC controller for controlling the opening of the electric valve is set to be deltaP=P 1 -P 2 More than 0.3MPa, and after each time of opening, the electric valve is controlled to be closed by the PLC controller after the opening time is kept for at least 10 s;
and (B) step (B): the PLC is connected with the alarm, the number of times that the electric valve is opened is defined as N, and the threshold value N of the alarm which is controlled by the PLC to send out an alarm is set to be more than or equal to 1 so as to prompt a worker to treat the dirt stored in the dirt receiving device.
CN202111542099.4A 2021-12-16 2021-12-16 Automatic dredging and filtering system for crude oil gathering and conveying pipeline and using method thereof Pending CN116265057A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111542099.4A CN116265057A (en) 2021-12-16 2021-12-16 Automatic dredging and filtering system for crude oil gathering and conveying pipeline and using method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111542099.4A CN116265057A (en) 2021-12-16 2021-12-16 Automatic dredging and filtering system for crude oil gathering and conveying pipeline and using method thereof

Publications (1)

Publication Number Publication Date
CN116265057A true CN116265057A (en) 2023-06-20

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ID=86743120

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Application Number Title Priority Date Filing Date
CN202111542099.4A Pending CN116265057A (en) 2021-12-16 2021-12-16 Automatic dredging and filtering system for crude oil gathering and conveying pipeline and using method thereof

Country Status (1)

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CN (1) CN116265057A (en)

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