A pipeline bidirectional moving high-pressure water jet pipeline assembly and operation method

Abstract

This invention relates to a bidirectional moving high-pressure water jet pipeline assembly and operating method within a pipeline. It primarily addresses the problem that existing high-pressure water jet cleaning devices are difficult to move over long distances. The invention is characterized by: the high-pressure resin pipe comprising an outer high-pressure resin pipe (8) and an inner high-pressure resin pipe (9), with a cleaning nozzle (13) connected to the front end of the high-pressure resin pipe. The cleaning nozzle (13) has a guide pipe connected to the inner high-pressure resin pipe (9) inside. A forward nozzle (14) and a guide nozzle (15) are connected between the guide pipe and the outer surface of the cleaning nozzle (13), wherein the outer end of the forward nozzle (14) is tilted backward, and the outer end of the guide nozzle (15) is located in front of the cleaning nozzle (13). This bidirectional moving high-pressure water jet pipeline assembly within a pipeline can achieve bidirectional driving of the cleaning pipe's forward and backward movement using the power of the delivered high-pressure water flow, improving the controllability of the high-pressure water jet pipeline.

Description

Technical Field

[0001] This invention relates to the field of oilfield production engineering technology, specifically to a bidirectional moving high-pressure water jet pipeline assembly and its operation method within a pipeline. Background Technology

[0002] Since the development of ternary composite flooding, scaling problems in oilfield gathering and transportation systems have become increasingly serious. The most affected are single-well oil gathering pipelines. As scaling deepens within the pipelines, the cross-sectional area decreases, wellhead back pressure increases, and the well's fluid production channel is restricted, resulting in a significant drop in production and severely impacting oilfield output. Taking our mining area as an example, the affected area involves over 1200 km of scaled single-well pipelines. The scale within these pipelines is mainly composed of carbonates, hydroxides, and silicates. Under the combined effects of factors such as gelation, the scale becomes extremely hard and difficult to remove.

[0003] Currently, the main methods for treating pipeline scaling in major oilfield blocks in my country are hydraulic turbulence cleaning, mechanical ball throwing, chemical cleaning, and high-pressure water jet cleaning. Each technology has its advantages and disadvantages, and none can completely remove the scale inside the pipeline. This results in a short scaling cycle, making removal difficult and only addressing the symptoms, not the root cause. There is currently no technology that can complete long-distance pipeline descaling in a "low-cost, high-efficiency" manner, placing significant cost pressure on enterprises. High-pressure water jet cleaning, however, has advantages such as low cost, high speed, high cleaning rate, no damage to the cleaned object, wide application range, and no environmental pollution. However, current high-pressure water jet cleaning devices have limited continuous forward movement capability, making it difficult for them to travel long distances within the pipeline, which greatly restricts the technology's development. Summary of the Invention

[0004] To overcome the shortcomings of existing high-pressure water jet cleaning devices that are difficult to move over long distances, this invention provides a bidirectional moving high-pressure water jet pipeline assembly within a pipe. This assembly can achieve bidirectional driving of the cleaning pipe's forward and backward movement by utilizing the power of the delivered high-pressure water flow, thereby improving the controllability of the high-pressure water jet pipeline.

[0005] The technical solution of the present invention is: a bidirectional moving high-pressure water jet pipeline assembly in a pipeline, comprising a high-pressure resin pipe, the high-pressure resin pipe including an outer high-pressure resin pipe and an inner high-pressure resin pipe, the front end of the high-pressure resin pipe being connected to a cleaning nozzle, the cleaning nozzle having a guide pipe inside connected to the inner high-pressure resin pipe, a forward nozzle and a guide nozzle being connected between the guide pipe and the outer surface of the cleaning nozzle, wherein the outer end of the forward nozzle is inclined backward, and the outer end of the guide nozzle is located in front of the cleaning nozzle.

[0006] It also includes a nested tube connection assembly, which includes an inner tube and an outer tube, wherein the inner high-pressure resin tube is connected to the inner tube and the outer high-pressure resin tube is connected to the outer tube.

[0007] The nested tube connecting assembly has several forward nozzles between the inner surface of the inner tube and the outer surface of the outer tube, and several backward nozzles on the side wall of the outer tube. The outer ends of the forward nozzles are tilted backward, and the outer ends of the backward nozzles are tilted forward.

[0008] A support plate is provided between the inner and outer tubes of the nested tube connection assembly, and an axial guide hole is opened on the support plate.

[0009] The high-pressure resin tube is connected to a dual-way switching valve at its rear end, which is used to switch the water flow from inside the inner high-pressure resin tube or between the inner and outer high-pressure resin tubes.

[0010] In the nested tube connection assembly, the two ends of the inner tube are respectively connected to two inner high-pressure resin tubes through inner tube connectors, and the two ends of the outer tube are respectively connected to two outer high-pressure resin tubes through outer tube connectors.

[0011] The cleaning nozzle has a circulation channel inside that connects the inner high-pressure resin tube to the outer high-pressure resin tube.

[0012] It also includes a protective sleeve, which is threaded to the outside of the nested tube connection assembly. Moving the position of the protective sleeve allows for the selection of whether to close or open the forward nozzle and / or the backward nozzle.

[0013] A method for operating a bidirectional moving high-pressure water jet pipeline assembly within the aforementioned pipeline includes: Step S1: After connecting the high-pressure resin tube to the cleaning nozzle, insert it into the pipe to be worked. Start the high-pressure pump set and introduce high-pressure water into the inner high-pressure resin tube through the dual-way switching valve. The high-pressure water enters the cleaning nozzle along the inner flow channel and forms high-pressure water at the outlet of the guide nozzle to impact the object in front. The reverse force generated by the forward nozzle pushes the nozzle forward. Step S2: After the single-section high-pressure resin tube assembly reaches the working pipe opening, the high-pressure pump set stops, the joint of a set of high-pressure resin tubes is disassembled, a nested tube connection assembly is added, the pump is started to continue cleaning, the forward nozzle and the connection assembly on the nested tube connection assembly continuously spray water backward to clean the pipe, and generate a reaction force to propel the cleaning pipe forward. Step S3: Repeat step S2 until the cleaning pipeline reaches the required length for the operation. Step S4: After cleaning is completed, switch the dual-way switching valve to introduce high-pressure water into the flow channel of the outer high-pressure resin tube. The high-pressure water enters the retracting nozzle of the nested tube connection assembly along the flow channel of the outer high-pressure resin tube, forming a high-pressure jet that pushes the entire cleaning pipeline backward. Step S5: When each nested pipe connection assembly reaches the working pipe opening, stop the pump and remove the nested pipe connection assembly. Repeat the pump start-stop cycle until the entire pipeline is retracted.

[0014] A method for operating a bidirectional moving high-pressure water jet pipeline assembly within the aforementioned pipeline includes: Step 1: According to the pipe length, assemble several nested pipe connection components, high-pressure resin pipes, and a cleaning nozzle at once. Connect the protective sleeve to the outside of the nested pipe connection components and seal the nozzle outlet of the connection components. Step 2: Insert the cleaning pipe into the pipe to be cleaned, start the high-pressure pump set, and use the dual-way switching valve to introduce high-pressure water into the inner flow channel of the inner high-pressure resin pipe and the cleaning nozzle to clean the object in front of it. At the same time, the reverse action pushes the nozzle forward. Step 3: When each section of the nested pipe connection assembly reaches the working pipe opening, rotate the protective sleeve to open the forward and backward nozzle outlets of the connection assembly, allowing the cleaning pipeline to enter the cleaning pipeline for cleaning work. Step 4: After cleaning, switch the dual-way switching valve to introduce high-pressure water into the flow channel of the outer high-pressure resin tube. The high-pressure water enters the retractable nozzle of the nested tube connection assembly along the flow channel of the outer high-pressure resin tube, forming a high-pressure jet that pushes the entire cleaning pipeline backward. Step 5: When each nested pipe connection assembly reaches the working pipe opening, rotate the protective sleeve to close the retractable nozzle outlet until the cleaning pipeline is completely retracted.

[0015] The present invention has the following beneficial effects: Due to the above-mentioned solution, the cleaning pipeline achieves pipeline cleaning through high-pressure water flow. By changing the water inlet to control the forward and backward movement of the cleaning pipeline, it is possible to carry out cleaning work on parallel pipelines and long-distance pipelines, solving the problem of long-distance movement in parallel pipelines, improving the controllability of the high-pressure water jet pipeline, ensuring good operation continuity, and guaranteeing the cleaning effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the nested tube connection assembly in this invention; Figure 3 This is a schematic diagram showing the protective cover opening the connecting assembly's forward and backward nozzle outlets; Figure 4 This is a schematic diagram showing the protective sleeve sealing the outlets of the forward and backward nozzles of the connecting assembly. Figure 5 This is a schematic diagram of the cleaning pipeline advancing; Figure 6 This is a diagram showing the process of retracting the cleaning pipeline.

[0017] In the diagram, 1-nested tube connection assembly, 2-inner tube, 3-external thread, 4-outer tube, 5-guide hole, 6-connecting assembly forward nozzle, 7-reverse nozzle, 8-outer high-pressure resin tube, 9-inner high-pressure resin tube, 10-outer tube connector, 11-inner tube connector, 12-pipe head thread, 13-cleaning nozzle, 14-forward nozzle, 15-guide nozzle, 16-internal thread. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings: Depend on Figures 1 to 6 As shown, a bidirectional moving high-pressure water jet pipeline assembly includes a high-pressure resin tube, comprising an outer high-pressure resin tube 8 and an inner high-pressure resin tube 9. The length of a single high-pressure resin tube is 20m-50m, and the inner and outer high-pressure resin tubes are used in conjunction during operation. The front end of the high-pressure resin tube is connected to a cleaning nozzle 13. Typically, the cleaning nozzle 13 includes a shell and an internal guide tube. The shell is connected to the outer high-pressure resin tube 8. The guide tube is located inside the cleaning nozzle 13 and connected to the inner high-pressure resin tube 9. The front end of the guide tube is closed, and a forward nozzle 14 and a guide nozzle 15 are connected between the guide tube and the outer surface of the cleaning nozzle 13. The outer end of the guide nozzle 15 is located at the front of the cleaning nozzle 13. Several forward nozzles 14 are evenly distributed along the circumference, and the outer ends of the forward nozzles 14 are tilted backward. This causes the water outlet direction of the forward nozzles 14 to be backward, generating a forward thrust that drives the cleaning nozzle 13 forward.

[0019] The piping assembly also includes several nested pipe connection assemblies 1, with one nested pipe connection assembly 1 connecting two adjacent sets of high-pressure resin pipes. Each nested pipe connection assembly 1 includes an inner pipe 2 and an outer pipe 4. The inner pipe 2 has external threads 3 at both ends, connecting to an inner pipe connector 10 via the external threads 3. The other end of the inner pipe connector 10 is connected to an inner high-pressure resin pipe 9. The outer pipe 4 has internal threads 16 at both ends, connecting to an outer pipe connector 11 via the internal threads 16. The other end of the outer pipe connector 11 is connected to an outer high-pressure resin pipe 8. A support plate is provided between the inner pipe 2 and the outer pipe 4 to ensure concentricity of the inner and outer pipes and form an annular cavity. An axial guide hole 5 is provided on the support plate to maintain unobstructed flow. Several forward nozzles 6 are provided between the inner surface of the inner pipe 2 and the outer surface of the outer pipe 4. These forward nozzles 6 are evenly distributed circumferentially and have their outer ends tilted backward. Several backward nozzles 7 are provided on the side wall of the outer pipe 4, with their outer ends tilted forward. During machining, the outlet positions of the forward nozzle 6 and the backward nozzle 7 should not be on the same circumference, that is, their axial positions should be staggered.

[0020] After the high-pressure resin tube is connected, a dual-way switching valve is connected to the rear end to switch the water flow from inside the inner high-pressure resin tube 9 or between the inner and outer high-pressure resin tubes. The pipeline assembly can also be equipped with several protective sleeves 18. When needed, the protective sleeves 18 can be threaded to the outside of the nested pipe connection assembly 1. By moving the position of the protective sleeves 18 axially, it is possible to select whether the forward nozzle 6 and the backward nozzle 7 of the connection assembly are completely closed or completely open, or one nozzle can be opened while the other nozzle is closed.

[0021] The pipeline assembly consists of an inner high-pressure resin tube 9, an inner tube 2, and an outer high-pressure resin tube 8, an outer tube 4, forming two separate chambers. A dual-way switching valve allows for switching the water flow into the designated chamber. When water is injected into the inner chamber, it is sprayed outwards through the connecting assembly's forward nozzle, forward nozzle 14, and guide nozzle 15. The resulting high-pressure jet impacts the pipe wall, while the backward force generated by the forward nozzle and forward nozzle 14 propels the pipeline assembly forward, carrying away scale and debris from the pipe's inner wall, thus achieving descaling. When water is injected into the outer chamber, it is sprayed outwards through the backward nozzle 7. The forward-facing direction of the backward nozzle 7 pushes the pipeline assembly backwards, removing it from the pipe.

[0022] Preferably, the nested pipe connection assembly 1 includes three forward nozzles 6 and three backward nozzles 7, each with an inner diameter of ∮0.4mm; an outer high-pressure resin pipe 8 with an inner diameter of 20mm and an outer diameter of 33mm, a design working pressure of 60MPa, and a pipe pressure resistance ≥100MPa; and an inner high-pressure resin pipe 9 with an inner diameter of 8mm and an outer diameter of 13mm, a design working pressure of 80MPa, and a pipe pressure resistance ≥120MPa. The combined weight of the two sets of pipes is 0.78kg / m. One connection assembly is provided every 30 meters. To ensure continuous pipeline advancement, the reverse thrust of the cleaning nozzle 13 must be greater than the sum of the weights of one set of nested pipe connection assembly 1 and the high-pressure resin pipe. Simultaneously, the sum of the weights of one set of nested pipe connection assembly 1 and the high-pressure resin pipe must be equal to the reverse thrust of the forward nozzle 6 and the backward nozzle 7 of the connection assembly. When pressurizing the inner high-pressure resin pipe 9 at full load, the pipe needs to be pushed forward for cleaning and movement. However, when pressurizing the outer high-pressure resin pipe 8, only half the pressure is required. Therefore, the actual pressure-bearing capacity of the inner resin pipe 9 > the pressure-bearing capacity of the inner resin pipe ≤ the pressure-bearing capacity of the inner resin pipe + half the water pressure of the outer high-pressure resin pipe. Under the superimposed protection of the outer high-pressure resin pipe 8 and the high-pressure water body, the actual high-pressure water resistance of the inner resin pipe 9 is greatly improved. Therefore, the water pressure can be increased in a short time to improve the local cleaning effect and ensure that the cleaning pipe does not rupture.

[0023] As a preferred option, according to the actual piping requirements of the cleaning component process, the outlet end of the outer high-pressure resin pipe 8 connected to the cleaning nozzle 13 can be closed, that is, there is only an inner high-pressure resin pipe 9 between the outlet of the outer high-pressure resin pipe 8 and the cleaning nozzle 13, and there is no need to install the outer high-pressure resin pipe 8, thereby improving the flexibility of the cleaning nozzle 3 and the first section of the inner resin pipe 9 in the cleaning pipeline.

[0024] Preferably, the cleaning nozzle 13 has an internal circulation channel, which allows the flow channels of the outer high-pressure resin pipe 8 and the inner high-pressure resin pipe 9 to converge. When high-pressure water is delivered from the inner high-pressure resin pipe 9 to the cleaning nozzle 13, part of the water is sprayed out from the forward nozzle 14 and the guide nozzle 15 to perform cleaning and propulsion tasks, while the other part of the high-pressure water returns to the flow channel of the outer high-pressure resin pipe 8 and flows in the return direction. This results in two operations: one is that while the forward nozzle 14 and the guide nozzle 15 are cleaning, the backward nozzle 7 is also cleaning, improving the overall cleaning quality of the working pipeline and slowing down the movement of the cleaning pipeline; the other operation is that there is no backward nozzle 7 on the nested pipe connection assembly 1 or the backward nozzle 7 is blocked, and the high-pressure water returns directly to the beginning of the cleaning pipeline. The flow is controlled by a control valve, thereby precisely adjusting the cleaning pressure and water volume of the cleaning pipeline and improving the safety of low-pressure working pipelines.

[0025] Depending on the operating procedure, the bidirectional moving high-pressure water jet pipeline assembly inside this pipeline can have the following different functions.

[0026] A method for operating a bidirectional moving high-pressure water jet pipeline assembly within a pipeline includes: Step S1: After connecting the high-pressure resin tube to the cleaning nozzle 13, insert it into the pipe to be cleaned. Start the high-pressure pump set and introduce high-pressure water into the inner high-pressure resin tube 9 through the dual-way switching valve. The high-pressure water enters the cleaning nozzle 13 along the inner flow channel and forms a high-pressure water flow at the outlet of the guide nozzle 15 to impact the object in front. The high-pressure water flow sprayed from the forward nozzle 14 removes the dirt from the pipe wall. At the same time, the reverse force generated by the water flow backward from the forward nozzle 14 pushes the nozzle forward. The scale and dirt broken and removed from the inner wall of the pipe are carried out of the pipe with the water flow, thus realizing the pipe descaling operation.

[0027] Step S2: After the single-section high-pressure resin tube assembly reaches the working pipe opening, the high-pressure pump set stops, the joint of one set of high-pressure resin tubes is disassembled, a nested pipe connection assembly 1 and a set of high-pressure resin tubes are added into the pipeline, the pump is restarted to continue cleaning, and the forward nozzle 14 and the forward nozzle 6 on the connecting assembly of the nested pipe connection assembly 1 continuously spray water backward to clean the pipeline, generating a reaction force to propel the cleaning pipeline forward. See Figure 5 .

[0028] Step S3: After the new section of high-pressure resin pipe arrives at the working pipe opening, the high-pressure pump unit stops pumping and continues to add nested pipe connection component 1. According to the pipe length, nested pipe connection component 1 and high-pressure resin pipe are added in a cycle until the cleaning pipe reaches the required length for the operation.

[0029] Step S4: After cleaning, switch the dual-path switching valve to introduce high-pressure water into the flow channel of the outer high-pressure resin pipe 8. The high-pressure water enters the retractable nozzle 7 of the nested pipe connection assembly 1 along the flow channel of the outer high-pressure resin pipe 8, forming a high-pressure jet that pushes the entire cleaning pipeline backward. Figure 6 .

[0030] Step S5: When each nested pipe connection assembly 1 reaches the working pipe opening, stop the pump, remove the nested pipe connection assembly 1 and its external high-pressure resin pipe, and repeat the pump start-up, circulation recovery and disassembly cleaning of the pipeline until all are recovered.

[0031] When using protective sleeve 18, the following rapid operation method can also be adopted: Step 1: Based on the pipe length, assemble several nested pipe connection components 1, high-pressure resin pipes, and a cleaning nozzle 13 in one go. Connect a protective sleeve 18 to the outside of each nested pipe connection component 1 and make the protective sleeve 18 seal the outlet of the nozzle 6 of all connection components.

[0032] Step 2: Insert the cleaning pipe into the pipe to be cleaned, start the high-pressure pump set, and introduce high-pressure water into the inner flow channel of the inner high-pressure resin pipe 9 through the dual-way switching valve. The high-pressure water enters the cleaning nozzle 13 along the flow channel. The high-pressure water jet from the forward nozzle 14 removes the dirt from the pipe wall. At the same time, the reverse force generated by the backward water flow of the forward nozzle 14 pushes the nozzle forward.

[0033] Step 3: When each section of the nested pipe connection assembly 1 reaches the working pipe opening, quickly rotate the protective sleeve 18 to open the outlet of the forward nozzle 6 and the backward nozzle 7 of the connection assembly. The cleaning pipeline enters the cleaning pipeline for cleaning work. The scale and dirt broken and removed from the inner wall of the pipeline are carried out of the pipeline with the water flow, thus achieving the purpose of pipeline descaling.

[0034] Step 4: After cleaning the pipeline to the required length and cleaning is completed, switch the dual-way switching valve to introduce high-pressure water into the flow channel of the outer high-pressure resin pipe 8. The high-pressure water enters the retractable nozzle 7 of the nested pipe connection assembly 1 along the flow channel of the outer high-pressure resin pipe 8, forming a high-pressure jet that pushes the entire cleaning pipeline backward. Step 5: When each nested pipe connection component 1 reaches the working pipe opening, quickly rotate the protective sleeve 18 to close the exit of the retracting nozzle 7. Repeat this process until the entire cleaning pipeline is retracted.

[0035] This solution has good continuous operation characteristics, which can avoid the risk of pipe scale blockage caused by temporarily replacing the nested pipe connection component 1 during the operation, and achieve full-section cleaning in one go.

[0036] The cleaning pipeline described in this invention offers strong operability and reliability for cleaning long-distance parallel pipelines. Within the aforementioned component structure, each component possesses greater combinability, expandability, and compatibility, and those skilled in the art can easily obtain new combination solutions through localized improvements. Therefore, the scope of this invention is not limited to the aforementioned structural features and also includes further functional structural extensions.

Claims

1. A bidirectional mobile high pressure water jet pipeline assembly inside a pipe, comprising a high pressure resin pipe, characterized in that: The high-pressure resin tube includes an outer high-pressure resin tube (8) and an inner high-pressure resin tube (9). The front end of the high-pressure resin tube is connected to a cleaning nozzle (13). The cleaning nozzle (13) is provided with a guide tube connected to the inner high-pressure resin tube (9). A forward nozzle (14) and a guide nozzle (15) are connected between the guide tube and the outer surface of the cleaning nozzle (13). The outer end of the forward nozzle (14) is tilted backward, and the outer end of the guide nozzle (15) is located in front of the cleaning nozzle (13). It also includes a nested tube connection assembly (1), which includes an inner tube (2) and an outer tube (4), wherein the inner high-pressure resin tube (9) is connected to the inner tube (2) and the outer high-pressure resin tube (8) is connected to the outer tube (4); The inner surface of the inner tube (2) of the nested tube connecting assembly (1) is provided with a number of connecting assembly forward nozzles (6) between the inner surface of the inner tube (2) and the outer surface of the outer tube (4), and a number of retracting nozzles (7) are provided on the side wall of the outer tube (4). The outer end of the connecting assembly forward nozzle (6) is tilted backward, and the outer end of the retracting nozzle (7) is tilted forward. A support plate is provided between the inner tube (2) and the outer tube (4) of the nested tube connection assembly (1), and an axial guide hole (5) is opened on the support plate. The high-pressure resin pipe (9) is connected to a dual-way switching valve at its rear end, which is used to switch the water flow from inside the inner high-pressure resin pipe (9) or between the inner and outer high-pressure resin pipes. It also includes a protective sleeve (18), which is threaded to the outside of the nested tube connection assembly (1). Moving the position of the protective sleeve (18) allows for the selection of closing or opening the forward nozzle (6) and / or the backward nozzle (7) of the connection assembly.

2. The inline bidirectional mobile high-pressure waterjet plumbing assembly of claim 1, wherein: The inner tube (2) of the nested tube connection assembly (1) is connected to two inner high-pressure resin tubes (9) at both ends through inner tube connectors (10), and the outer tube (4) is connected to two outer high-pressure resin tubes (8) at both ends through outer tube connectors (11).

3. The inline bidirectional mobile high-pressure waterjet plumbing assembly of claim 1, wherein: The cleaning nozzle (13) has a circulation channel inside that connects the guide pipe to its external cavity, thereby connecting the inner high-pressure resin tube (9) to the outer high-pressure resin tube (8).

4. A method for operating a bidirectional moving high-pressure water jet pipeline assembly as described in any one of claims 1-3, characterized in that... include: Step S1: After connecting the high-pressure resin tube to the cleaning nozzle (13), insert it into the pipe to be worked, start the high-pressure pump group, and introduce high-pressure water into the inner high-pressure resin tube (9) through the dual-way switching valve. The high-pressure water enters the cleaning nozzle (13) along the inner flow channel, and forms high-pressure water at the outlet of the guide nozzle (15) to impact the object in front. The reverse force generated by the forward nozzle (14) pushes the nozzle forward. Step S2: After the single-section high-pressure resin pipe group reaches the working pipe opening, the high-pressure pump group stops pumping, disassembles a set of high-pressure resin pipe joints, adds a nested pipe connection assembly (1), starts pumping to continue cleaning, and the forward nozzle (14) and the connecting assembly forward nozzle (6) on the nested pipe connection assembly (1) continuously spray water backward to clean the pipe and generate reaction force to propel the cleaning pipe forward. Step S3: Repeat step S2 until the cleaning pipeline reaches the required length for the operation. Step S4: After cleaning is completed, switch the dual-way switching valve to introduce high-pressure water into the flow channel of the outer high-pressure resin pipe (8). The high-pressure water enters the retracting nozzle (7) of the nested pipe connection assembly (1) along the flow channel of the outer high-pressure resin pipe (8), forming a high-pressure jet that pushes the entire cleaning pipeline backward. Step S5: When each nested pipe connection assembly (1) reaches the working pipe opening, stop the pump and remove the nested pipe connection assembly (1). Repeat the pump start-stop cycle until the entire pipeline is retracted.

5. A method for operating a bidirectional moving high-pressure water jet pipeline assembly as described in any one of claims 1-3, characterized in that... include: Step 1: According to the pipe length, assemble several nested pipe connection components (1), high-pressure resin pipe and a cleaning nozzle (13) at one time, connect the protective sleeve (18) to the outside of the nested pipe connection component (1), and seal the outlet of the forward nozzle (6) of the connection component; Step 2: Insert the cleaning pipe into the pipe to be cleaned, start the high-pressure pump set, and introduce high-pressure water into the inner flow channel of the inner high-pressure resin pipe (9) and the cleaning nozzle (13) through the dual-way switching valve to clean the object in front. At the same time, its reverse action pushes the nozzle forward. Step 3: When each section of the pipe nested pipe connection assembly (1) reaches the working pipe opening, rotate the protective sleeve (18) to open the outlet of the forward nozzle (6) and the backward nozzle (7) of the connection assembly, and the cleaning pipeline enters the cleaning pipeline for cleaning work; Step 4: After cleaning, switch the dual-way switching valve to introduce high-pressure water into the flow channel of the outer high-pressure resin pipe (8). The high-pressure water enters the retracting nozzle (7) of the nested pipe connection assembly (1) along the flow channel of the outer high-pressure resin pipe (8), forming a high-pressure jet that pushes the entire cleaning pipeline backward. Step 5: When each nested pipe connection assembly (1) reaches the working pipe opening, rotate the protective sleeve (18) to close the exit of the retracting nozzle (7) until the cleaning pipeline is completely retracted.

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