A pulse-type screen tube flushing device utilizing the peristalsis of a tubular column

Abstract

This invention relates to the field of oil well operation technology, specifically to a pulse-type screen flushing device utilizing tubing peristalsis. The device includes: an anchoring mechanism comprising: an anchoring actuator including a cone, slips, and a sliding tube, the sliding tube being fixedly connected to the cone; and an anchoring drive comprising a slip holder, a soluble shear pin, and a setting spring. The soluble shear pin restricts the displacement of the slip holder during downhole operation. After dissolving, the setting spring pushes the slip holder upwards, causing the slips to expand outwards along the cone surface. After connection, this invention is lowered to a designated position, cleverly utilizing the up-and-down peristaltic motion of the tubing during pump operation as the power source for the screen flushing device. This continuously flushes the screen inlet holes, preventing impurities from clogging the screen. No additional power source is required, effectively improving pump efficiency. It also meets green and environmentally friendly development requirements, does not alter the on-site construction process, requires no additional operation, and automatically sets after the soluble shear pin dissolves over a certain period.

Description

Technical Field

[0001] This invention relates to the field of oil well operation technology, and in particular to a pulse-type screen flushing device that utilizes the peristalsis of the tubing string. Background Technology

[0002] In oil drilling and production operations, screen pipes are key completion tools installed at the lower end of the pump. Their function is to allow formation fluids to enter the pump barrel while effectively blocking solid particles such as formation sand, preventing production accidents such as pump jamming, wear and tear on surface pipelines, and reservoir collapse caused by sand production.

[0003] However, during long-term production, screen pipes inevitably face clogging problems. On the one hand, fine sand and silt in the formation fluid gradually accumulate on the outside of the screen pipe's filter holes, forming sand bridges; on the other hand, waxes, colloids, asphaltene, and biofilms produced by bacterial metabolism in crude oil also adhere to the screen pipe surface, further exacerbating the clogging. Once the screen pipe is clogged, the fluid inlet channel narrows, the fluid supply capacity decreases, leading to a significant reduction in the pump efficiency of the oil pump. In severe cases, it can cause insufficient fluid supply or even complete depletion, forcing the well to shut down and require well workover operations. Traditional solutions usually involve pulling out the tubing string and replacing or cleaning the screen pipe, but well workover operations are costly and the downtime can last for several days to weeks, significantly impacting the oilfield's economic benefits.

[0004] To address screen pipe clogging, existing patents (such as CN213775339U) propose an electrically powered anti-clogging screen pipe. This device monitors flow rate using a flow sensor, and when clogging occurs, a motor is activated to drive the outer pipe to rotate, using centrifugal force to clear the blockage. However, this solution has significant drawbacks: first, it requires specialized double-layered screen pipes, making it incompatible with conventional screen pipes used in the field; second, precision components such as motors, gears, and sensors have poor reliability and a high failure rate in the high-temperature and corrosive environment of the well; and third, it alters on-site operating habits, increasing construction complexity. Summary of the Invention

[0005] In view of this, the purpose of this invention is to propose a purely mechanical screen pipe anti-clogging device that is simple in structure, requires no external power, and does not change the existing tubing connection method. It utilizes the working energy of the pumping unit itself to achieve automatic unclogging, thereby reducing the frequency of well workover and extending the pump inspection cycle.

[0006] To achieve the above objectives, the present invention provides a pulse-type screen tube flushing device utilizing the peristalsis of a tubular column, comprising: Anchoring mechanism, the anchoring mechanism comprising: An anchoring actuator, comprising a cone, a slip, and a slide tube, wherein the slide tube is fixedly connected to the cone; An anchoring drive includes a slipper, a soluble shear pin, and a setting spring. The soluble shear pin restricts the displacement of the slipper during the downhole process. After dissolving, the setting spring pushes the slipper upward, causing the slipper to expand outward along the conical surface, thus achieving automatic setting. The device further includes: The power input mechanism is linked to the tubing column and reciprocates with it; the power input mechanism includes: an upper connector, an upper central tube, a coupling, a lower central tube, and a lower plug that are connected in sequence to form the central channel of the device; the upper connector is connected to the oil pump; the lower plug is located at the lower end of the device; and the coupling moves up and down with the tubing column. The pulse generating mechanism includes an energy storage spring, a locking assembly, and a flushing assembly. A locking tube is located below the coupling, and the energy storage spring is sleeved outside the locking tube. The flushing assembly includes an impact tube and a piston. The upper end of the energy storage spring contacts the coupling, and the lower end contacts the impact tube. The impact tube and piston are fixedly connected or integrally formed. The locking assembly includes a locking tube and an impact locking ball. The impact tube has a through hole for accommodating the impact locking ball, and the locking tube is located inside the impact tube and has a release groove.

[0007] As a preferred embodiment of the present invention, a locking spring is provided between the locking tube and the impact tube, and the locking tube and the impact tube are connected by an axial sliding structure; after the impact is completed, the locking spring drives the locking tube to reset upward relative to the impact tube, so that the impact locking ball re-enters the locked state.

[0008] As a preferred embodiment of the present invention, the lower plug is fixed at the lower end of the lower central tube and located below the piston; when the tube moves upward, the lower plug drives the piston and the impact tube to reset upward synchronously.

[0009] As a preferred embodiment of the present invention, the device further includes an unsealing mechanism, which includes a rotary transmission assembly and an adjustment assembly; the adjustment assembly is a spring seat, which is threaded onto the outside of the slide tube. By rotating the tube column in the forward direction, the rotary transmission assembly drives the spring seat to rotate and generate axial displacement, thereby releasing the sealing spring and causing the anchoring mechanism to retract to achieve unsealing.

[0010] As a preferred embodiment of the present invention, the rotary transmission assembly includes: An outer cylinder with a long straight groove is provided. The lower end of the spring seat is fixedly connected to the outer cylinder, and the upper end of the spring seat abuts against the sealing spring. And a release pin that fits in the long straight groove; the release pin rotates synchronously with the coupling and slides along the axial direction of the long straight groove; the axial length of the long straight groove is greater than the trigger stroke of the pulse generating mechanism to ensure that the flushing action is not accidentally triggered during the release process.

[0011] As a preferred embodiment of the present invention, the anchoring mechanism further includes a locking ball, which blocks the internal channel before locking, drives the locking by pressurizing the ground pump, and automatically dissolves after locking.

[0012] The beneficial effects of this invention are as follows: After being connected, this invention is lowered to a designated position and cleverly utilizes the up-and-down peristaltic motion of the tubing during the operation of the oil pump as the power source for the screen tube flushing device. This allows for continuous flushing of the screen tube inlet hole, preventing impurities from clogging the screen tube. No additional power source is required, effectively improving the working efficiency of the oil pump. At the same time, it meets the requirements of green and environmentally friendly development, does not change the on-site construction process, and requires no additional operation. After the soluble shear nail dissolves over a certain period of time, the tool automatically sets and seals, and can automatically flush the inlet hole after normal production. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the assembly structure of the tubing, pump barrel, inlet valve, pulse-type screen flushing device, screen, sucker rod, plunger and outlet valve of the present invention. Figure 2 This is a schematic diagram of the overall half-section structure of the pulse-type screen tube flushing device of the present invention. Figure 3 for Figure 2 A magnified view of the structure at point A in the middle; Figure 4 for Figure 2 A magnified schematic diagram of the structure at point B in the middle; Figure 5 for Figure 2 A magnified schematic diagram of the structure at point C in the middle; Figure 6 for Figure 2 A magnified schematic diagram of the structure at point D.

[0015] The markings in the diagram are as follows: 1. Upper connector; 2. Upper central tube; 3. Cone; 4. Slipper; 5. Slipper holder; 6. Soluble shear pin; 7. Sealing ball; 8. Sealing spring; 9. Slide tube; 10. Spring seat; 11. Unsealing pin; 12. Coupling; 13. Outer cylinder; 14. Lower central tube; 15. Locking tube; 16. Energy storage spring; 17. Impact locking ball; 18. Impact tube; 19. Locking spring; 20. Piston; 21. Piston sleeve; 22. Lower plug; 23. Piston chamber; 24. Lower connector; 100. Tubing string; 200. Pump barrel; 300. Inlet valve; 400. Pulse-type screen flushing device; 500. Screen tube; 600. Sucker rod; 700. Plunger; 800. Outlet valve. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0017] like Figure 1 and Figure 2 As shown, the present invention provides a pulse-type screen tube flushing device 400 utilizing the peristaltic motion of a tubing column. The device is cylindrical in shape and composed of multiple functional sections connected axially. The pulse-type screen tube flushing device 400 is connected in series between the oil pump and the screen tube 500. The oil pump includes a pump barrel 200, a plunger 700, an inlet valve 300, and an outlet valve 800. The upper end of the pump barrel 200 is fixedly connected to the tubing column 100, which is driven by a ground-based oil pump (nodding donkey) to perform a reciprocating peristaltic motion. The sucker rod 600 is connected to the plunger 700, driving the plunger 700 to move up and down within the pump barrel 200. The upper end of the pulse-type screen flushing device 400 is connected to the lower end of the pump cylinder 200, and the lower end is connected to the upper end of the screen tube 500; the bottom of the screen tube 500 is equipped with a plug (not shown in the figure), thus forming a complete liquid inlet channel from the oil pump, the pulse-type screen flushing device 400, the screen tube 500 to the plug.

[0018] like Figure 2 As shown, the pulse-type screen tube flushing device 400 is composed of multiple concentric tubular components connected segment by segment along the axial direction. From top to bottom, the pulse-type screen tube flushing device 400 includes the following functional sections in sequence: Power input mechanism section: Located at the upper part of the pulse-type screen tube flushing device 400, it mainly includes upper connector 1, upper central tube 2, coupling 12, lower central tube 14 and lower plug 22 (see... Figure 1 , Figure 4 , Figure 5 The upper connector 1 is connected to the pump cylinder 200. The entire power input mechanism moves up and down with the tubing column 100, transmitting the peristalsis of the tubing column 100 to the lower mechanism.

[0019] Anchoring mechanism section: Located slightly upward in the middle of the pulse-type screen tube flushing device 400, it mainly includes cone 3, slip 4, slip holder 5, slide tube 9, setting spring 8, and soluble shear pin 6, etc. (see...) Figure 3 ), used to anchor a portion of the pulse-type screen flushing device 400 to the casing (i.e., the inner wall of the wellbore), providing a fixed fulcrum for subsequent pulse actions.

[0020] Pulse generating mechanism section: Located in the lower middle part of the pulse screen tube flushing device 400 (partially overlapping or adjacent to the anchoring mechanism section in the axial direction), including energy storage spring 16, locking tube 15, impact locking ball 17, impact tube 18, locking spring 19, piston 20, piston sleeve 21, and piston chamber 23 (see... Figure 6 This section utilizes the energy from the peristaltic movement of the tubing 100 to generate a high-pressure pulsed liquid flow through three processes: energy storage, locking, and release, which then backwashes the screen tube 500.

[0021] In addition, the pulse-type screen tube flushing device 400 is also equipped with a sealing mechanism, which mainly includes an outer cylinder 13, a sealing pin 11, and a spring seat 10 (see...). Figure 4 The outer cylinder 13, as a component of the unsealing mechanism, has a long straight groove on its surface, which cooperates with the unsealing pin 11 to achieve torque transmission and axial sliding. The outer cylinder 13 is sleeved on the outside of part of the central tube and connected to the spring seat 10, used to compress the seat spring 8 during unsealing.

[0022] The aforementioned functional sections are arranged coaxially, with the central channel always open to ensure the normal flow of crude oil.

[0023] like Figure 2 , Figure 4 , Figure 5 As shown, the power input mechanism includes: an upper connector 1, an upper central tube 2, a coupling 12, a lower central tube 14, and a lower plug 22. These components are connected in sequence and form the central channel of the pulse-type screen tube flushing device 400. The upper end of the upper connector 1 is threadedly connected to the lower end of the pump cylinder 200; the upper central tube 2 is connected between the upper connector 1 and the coupling 12; the coupling 12 is fitted onto the connection between the upper central tube 2 and the lower central tube 14 and is fixedly connected to both; the lower end of the lower central tube 14 is fixedly connected to the lower plug 22. The lower plug 22 is located at the lowest point of the pulse-type screen tube flushing device 400, below the piston 20 described later.

[0024] As the tubing string 100 moves up and down, the pump barrel 200 of the oil pump moves synchronously with the tubing string 100. Since the upper connector 1 of the pulse-type screen flushing device 400 is fixedly connected to the pump barrel 200, the entire power input mechanism will reciprocate axially with the tubing string 100. Specifically, when the tubing string 100 moves downward, the coupling 12 moves downward; when the tubing string 100 moves upward, the coupling 12 moves upward.

[0025] Reference Figure 1 , Figure 2 , Figure 3 The function of the anchoring mechanism is to enable the lower half of the pulse-type screen tube flushing device 400 to be automatically and reliably anchored on the inner wall of the sleeve, thereby providing a fixed support point for the pulse generating mechanism.

[0026] like Figure 2 , Figure 3 As shown, the anchoring mechanism consists of two parts: an anchoring actuator and an anchoring drive.

[0027] The anchoring actuator includes a cone 3, a slip 4, and a slide tube 9. The slide tube 9 is fixedly connected to the cone 3. The slip 4 is an arc-shaped block with external teeth, arranged circumferentially on the outside of the cone 3, and its inner surface has an inclined surface that mates with the outer conical surface of the cone 3. The slip 4 can slide up and down along the inclined surface of the cone 3, thereby expanding outward or retracting inward.

[0028] The anchoring drive includes a slipper 5, a soluble shear pin 6, and a setting spring 8. The slipper 5 is located below and connected to the slip 4. The setting spring 8 is sleeved on the outside of the slide tube 9, with its upper end limited by a spring seat 10 and its lower end abutting against the slipper 5. In the initial state (during the well run-in process), the soluble shear pin 6 passes through the holes on the slipper 5 and the slide tube 9, locking the slipper 5 in a low position, keeping the setting spring 8 compressed, while the slip 4 retracts into the groove of the cone 3. The pulse-type screen flushing device 400 has the smallest outer diameter, facilitating well run-in (see...). Figure 2 ).

[0029] After being run into the well, the oil-water mixture downhole gradually dissolves the soluble shear pins 6. The soluble shear pins 6 are made of known magnesium-aluminum alloys or soluble polymer materials and completely dissolve within hours to days under downhole temperatures (typically 40-120°C) and liquid conditions. Once the shear pins dissolve, the slipper 5 is released, and the elastic force of the setting spring 8 pushes the slipper 5 upwards. The slipper 5 then causes the slips 4 to climb upwards along the inclined surface of the cone 3. The conical surface of the cone 3 forces the slips 4 to expand radially outwards, tightly gripping the inner wall of the casing like an expansion bolt, thus achieving anchoring. At this point, the cone 3, slips 4, slide pipe 9, and the components fixed to them (including the lower connecting parts of the outer cylinder 13, etc.) are all fixed to the casing and no longer move.

[0030] As an optional supplement, the anchoring mechanism also includes a setting ball 7. Before setting, the setting ball 7 is dropped from the surface and falls onto a ball seat inside the slide pipe 9, blocking the internal passage. At this time, the surface pump pressurizes the tubing string 100, preventing the high-pressure fluid from flowing downwards. The resulting high pressure pushes the setting spring 8 to further compress or provide setting assistance. After setting is complete, the setting ball 7 automatically dissolves in the downhole fluid, restoring the central passage to its original state.

[0031] In this embodiment, the adjusting component is specifically a spring seat 10. The spring seat 10 is threaded onto the outside of the slide tube 9, with its lower end fixedly connected to the outer cylinder 13 and its upper end abutting against the setting spring 8. When the outer cylinder 13 rotates, it synchronously drives the spring seat 10 to move along the axial direction of the slide tube 9, thereby compressing or releasing the setting spring 8. Specifically, when the spring seat 10 moves away from the Cavato 5, the distance between them increases, and the setting spring 8 is gradually released. Conversely, when the spring seat 10 moves closer to the Cavato 5, the distance between them decreases, and the setting spring 8 is gradually compressed. This part is common knowledge to those skilled in the art, and this invention does not make any improvements to it, so it will not be described in detail here.

[0032] Reference Figure 2 , Figure 4 and Figure 5 The pulse generating mechanism is the core improvement of this invention. It includes an energy storage spring 16, a locking assembly, and a flushing assembly. This mechanism utilizes the peristaltic energy of the tubular column 100 to generate a high-pressure pulsed liquid flow through three processes: energy storage, locking, and release, which flushes the screen tube 500 in the reverse direction. This mechanism is located above the anchoring mechanism (partially overlapping axially with the anchoring mechanism) and is linked to the power input mechanism. Most of its components are mounted on the outside of the lower central tube 14.

[0033] like Figure 5 As shown, the energy storage spring 16 is sleeved on the outside of the locking tube 15, with its upper end contacting the lower end face of the coupling 12 and its lower end contacting the upper end face of the impact tube 18. The coupling 12, as part of the power input mechanism, moves up and down with the tube column 100; the impact tube 18 is a component of the flushing assembly, and its initial position is defined by the locking assembly.

[0034] The flushing assembly includes an impact tube 18 and a piston 20. The impact tube 18 is a hollow tube, and its lower end is fixedly connected to the piston 20 (either by thread or integral molding). The piston 20 is installed inside a piston sleeve 21, which is fixed to the outside of the lower central tube 14. A piston chamber 23 is formed below the piston 20 and is pre-filled with liquid (usually well fluid or clean water). A drain port is provided at the bottom of the piston chamber 23, which communicates with the internal channel of the screen tube 500 via a lower connector 24.

[0035] The locking assembly includes a locking tube 15, an impact locking ball 17, and a locking spring 19. The locking tube 15 is located inside the impact tube 18, and the two are connected by an axial sliding structure (for example, the outer wall of the locking tube 15 has a raised sliding key, and the inner wall of the impact tube 18 has a corresponding sliding groove, so that the two can move axially relative to each other but cannot rotate relative to each other). An annular release groove (recess) is formed on the wall of the locking tube 15.

[0036] The impact tube 18 has several (usually 3 to 6) radial through holes on its wall, each containing an impact locking ball 17. The diameter of the impact locking ball 17 is larger than the radial thickness of the through hole, causing a portion of it to protrude from the inner and outer walls of the impact tube 18. A limiting step is provided above the inner wall of the piston sleeve 21. This limiting step has an axial slide section whose length matches the creeping stroke of the tube string 100.

[0037] The locking spring 19 is sleeved on the outside of the lower central tube 14. Its upper end contacts the lower end of the locking tube 15, and its lower end contacts the upper end face of the piston 20. It is used to push the locking tube 15 upward to reset after the impact is completed.

[0038] The following combination Figures 1 to 6 The working process of this device is described in detail below: 1. Sealing: Connect the pulse-type screen flushing device 400 below the oil pump and the screen 500 above it. The bottom of the screen 500 needs to be equipped with a plug. After being lowered into the well, it is lowered to the designated position along with the oil pump.

[0039] The setting spring 8 is compressed in the initial state. After the soluble shear pin 6 dissolves within a certain time, the camshaft 5 is released. Since the spring seat 10 is fixed to the slide tube 9 by a threaded connection, the setting spring 8 will push the camshaft 5 upward. The camshaft 5 drives the camshaft 4 upward along the cone 3. The camshaft 4 expands outward, anchoring the pulse screen flushing device 400 on the sleeve, thus completing the setting action.

[0040] 2. Production flushing action: After the well is set, it enters the production stage. At this time, the plunger 700 in the pump moves up and down, which will drive the tubing string 100 (which is usually called tubing in the industry, but tubing string 100 is a broader concept) to move up and down. The range of movement is affected by the extension and retraction of the tubing string 100. The deeper the pump is, the longer the tubing string 100 is, and the greater the range of movement of the tubing string 100 during production.

[0041] Utilizing this phenomenon, the tool is connected below the oil pump and above the screen tube 500, with a threaded plug at the end of the screen tube 500. During production, oil can only enter the oil pump through the screen tube 500. In the anchored state, the cone 3, slip 4, slip holder 5, and slide tube 9 are fixed to the casing and remain stationary.

[0042] The outer cylinder 13 has long straight grooves at both ends, and the upper end of the coupling 12 is equipped with a release pin 11, which can slide within the long straight groove of the outer cylinder 13. When the tubing 100 moves downward, it synchronously drives the upper connector 1, upper central tube 2, coupling 12, lower central tube 14, and lower plug 22 downward. The downward movement of the coupling 12 synchronously compresses the energy storage spring 16 downward.

[0043] Since the locking tube 15 is connected to the impact tube 18, the energy storage spring 16 synchronously pushes the locking tube 15, the impact locking ball 17, and the impact tube 18 downwards. Due to the limiting step inside the piston sleeve 21, after descending a certain distance, the impact locking ball 17 is limited by the step and cannot continue to descend.

[0044] However, the creeping distance of the tubing 100 can continue to drive the coupling 12 and the lower central tube 14 to continue downward. The energy storage spring 16 begins to be compressed and store energy until the coupling 12 contacts the locking tube 15 and pushes the locking tube 15 downward. The surface of the locking tube 15 is provided with an annular groove for releasing the impact locking ball 17.

[0045] After the locking tube 15 continues to descend a certain distance, the impact locking ball 17 is released. Under the action of the energy storage spring 16, the locking tube 15 and the impact tube 18 drive the piston 20 to descend rapidly, quickly discharging the liquid in the piston chamber 23 and rapidly discharging it through the bottom screen tube 500, thereby achieving the effect of flushing impurities in the liquid inlet hole of the screen tube 500.

[0046] When the plunger 700 of the oil pump moves upward, it drives the tubing string 100 to move upward, simultaneously driving the upper connector 1, upper central tube 2, coupling 12, lower central tube 14, and lower plug 22 to move upward. The lower plug 22 then drives the piston 20 to move upward and reset.

[0047] Once the impact locking ball 17 returns to the annular groove within the piston sleeve 21, the locking spring 19 pushes the locking tube 15 upwards, causing the impact locking ball 17 to disengage from the annular groove of the locking tube 15. At this point, the tool as a whole has completed its reset and can proceed with the next energy storage activation and flushing action of the screen tube 500.

[0048] 3. Unsealing procedures: With the tool in the anchored state, the cone 3, slip 4, slip holder 5, and slide tube 9 are fixed to the sleeve and remain stationary. Rotating the pipe column 100 forward causes the upper connector 1, upper center tube 2, and coupling 12 to rotate forward, transmitting torque to the outer cylinder 13 through the unsealing pin 11.

[0049] The outer cylinder 13 is connected to the spring seat 10. Simultaneously, the slide tube 9 is fixed in place due to the tool setting seal, and the torque is transmitted to the spring seat 10 through the forward rotating column 100. The spring seat 10 rotates downward, and the setting spring 8 is gradually released until the slip 4 is completely retracted into the cone 3. At this point, the slip 4 is retracted, the tool is unsealed, and the column 100 can be lifted.

[0050] Those skilled in the art should understand that any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A pulse-type screen tube flushing device utilizing the peristalsis of a tubular column, comprising: Anchoring mechanism, the anchoring mechanism comprising: An anchoring actuator, comprising a cone (3), a slip (4) and a slide tube (9), wherein the slide tube (9) is fixedly connected to the cone (3); The anchoring drive includes a slipper (5), a soluble shear pin (6), and a setting spring (8). The soluble shear pin (6) restricts the displacement of the slipper (5) during the downhole process. After dissolving, the setting spring (8) pushes the slipper (5) upward, causing the slip (4) to expand outward along the surface of the cone (3) to achieve automatic setting. The device is characterized in that it further includes: The power input mechanism is linked to the tubing column (100) and moves back and forth with it; the power input mechanism includes: an upper connector (1), an upper central tube (2), a coupling (12), a lower central tube (14), and a lower plug (22) that are connected in sequence to form the central channel of the device. The upper connector (1) is connected to the oil pump, the lower plug (22) is located at the lower end of the device, and the coupling (12) moves up and down with the tubing column (100); The pulse generating mechanism includes an energy storage spring (16), a locking assembly, and a flushing assembly; a locking tube (15) is provided below the coupling (12), the energy storage spring (16) is sleeved on the outside of the locking tube (15), the flushing assembly includes an impact tube (18) and a piston (20), the upper end of the energy storage spring (16) contacts the coupling (12), and the lower end contacts the impact tube (18); the impact tube (18) and the piston (20) are fixedly connected or integrally set; the locking assembly includes a locking tube (15) and an impact locking ball (17), the impact tube (18) is provided with a through hole to accommodate the impact locking ball (17), and the locking tube (15) is located inside the impact tube (18) and is provided with a release groove.

2. The pulse-type screen flushing device utilizing the peristalsis of a tubular column according to claim 1, characterized in that, A locking spring (19) is provided between the locking tube (15) and the impact tube (18). The locking tube (15) and the impact tube (18) are connected by an axial sliding structure. After the impact ends, the locking spring (19) drives the locking tube (15) to reset upward relative to the impact tube (18), so that the impact locking ball (17) re-enters the locking state.

3. The pulse-type screen tube flushing device utilizing the peristalsis of a tubular column according to claim 1, characterized in that, The lower plug (22) is fixed at the lower end of the lower central tube (14) and located below the piston (20); when the tube column (100) moves upward, the lower plug (22) drives the piston (20) and the impact tube (18) to reset upward synchronously.

4. The pulse-type screen tube flushing device utilizing the peristalsis of a tubular column according to claim 1, characterized in that, The device also includes an unsealing mechanism, which includes a rotary transmission assembly and an adjustment assembly; the adjustment assembly is a spring seat (10), which is threaded onto the outside of the slide tube (9). By rotating the tube column (100) in the forward direction, the rotary transmission assembly drives the spring seat (10) to rotate and generate axial displacement, thereby releasing the seat spring (8) and causing the anchoring mechanism to retract to achieve unsealing.

5. The pulse-type screen flushing device utilizing the peristalsis of a tubular column according to claim 4, characterized in that, The rotary transmission assembly includes: An outer cylinder (13) with a long straight groove is provided. The lower end of the spring seat (10) is fixedly connected to the outer cylinder (13), and the upper end of the spring seat (10) abuts against the seat spring (8). And the unsealing pin (11) that is fitted in the long straight groove; the unsealing pin (11) rotates synchronously with the coupling (12) and slides along the axial direction of the long straight groove; the axial length of the long straight groove is greater than the trigger stroke of the pulse generating mechanism to ensure that the flushing action is not accidentally triggered during the unsealing process.

6. The pulse-type screen tube flushing device utilizing the peristalsis of a tubular column according to claim 1, characterized in that, The anchoring mechanism also includes a seat sealing ball (7), which blocks the internal channel before setting, drives the setting by pressurizing the ground pump, and automatically dissolves after setting.

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