Horizontal well cyclone sand washing tool and sand washing pipe string

Abstract

The utility model discloses a horizontal well cyclone sand washing tool and sand washing pipe column, including cyclone sand washing pipe, still include bubble generating pipe, the bubble generating pipe is double -deck tubular structure, including outer tube, interlayer, inner tube, the interlayer front end of bubble generating pipe is provided with bubble generating mechanism, the interlayer rear end is provided with the blow -out hole, the cyclone sand washing pipe is connected with the inner tube rear end, the utility model discloses through setting bubble generating pipe and form the relatively fine bubble, and the bubble can improve the sand -carrying effect of well washing fluid.

Description

Technical Field

[0001] This utility model relates to the field of oil and water well workover technology, specifically a horizontal well vortex sand flushing tool and sand flushing string. Background Technology

[0002] Horizontal wells can effectively improve the oil production rate and recovery rate of oil fields. Coupled with the continuous advancement of drilling and completion technologies, horizontal well technology has been widely used in oil and gas field development. However, many technologies related to horizontal well workover are still in the research and exploration stage.

[0003] For example, horizontal well sand flushing technology is one of the well workover technologies that many oilfields in China are still researching and exploring. Ordinary sand flushing methods are often insufficient to meet requirements, significantly impacting the productivity and lifespan of horizontal wells, while also extending the well occupation period and increasing operating costs. To address this, a horizontal well vortex sand flushing tool has been developed, which has significantly improved the sand flushing effect and efficiency of horizontal wells, playing a positive and effective role in actual operation and construction.

[0004] Problems with sand flushing in horizontal wells:

[0005] (1) Since there is no sand pocket in the horizontal well, the sand particles enter the wellbore from the formation and settle directly in the horizontal section to gradually form a sand bed. Due to various reasons, the compacted sand bed has a certain strength. When ordinary sand flushing is carried out, the flushing pipe or pen tip passes through the sand bed and the ground weight indicator does not show a clear indication, resulting in inaccurate sand surface data and inability to effectively flush the sand in the horizontal section.

[0006] (2) When the tubing string is close to the lower edge of the well wall in the horizontal section, the tubing string is subjected to the dual effects of "pendulum force" and friction, which makes it easy for the drill to get stuck.

[0007] (3) In horizontal well sections, no matter how strong the sand-carrying capacity of the flushing fluid is, some formation sand will always remain on the lower edge of the well wall during the upward return, forming residual sand, which increases the friction area and torque, resulting in complex well conditions.

[0008] (4) The flushed sand particles are prone to settling again in the horizontal section. Since the horizontal well requires a long section for flushing sand, the vertical spacing gradually decreases after entering the directional section, which shortens the settling distance of the sand carried in the flushing fluid. When connecting a single joint, the sand is prone to settling and forming a sand bridge, causing sand blockage.

[0009] Announcement No. CN206942702U discloses a vortex sand flushing tool for horizontal well casing. When used for sand flushing in horizontal wells, the liquid pumped into the wellbore drives the sand-stirring body to rotate. At the same time, the spiral grooves on the sand-stirring body can cause the water flow to change direction in a certain direction, thereby generating a strong spiral flushing force, stirring up the sand in the horizontal section, and improving the sand flushing effect of the horizontal well.

[0010] Announcement No. CN203559825U discloses a horizontal well vortex sand flushing device. The sand flusher is installed at the tail end of the central pipe. Under the action of backwash water flow, the sand flusher rotates and disturbs the sand deposited at the bottom of the casing in the horizontal section, making it suspended and easy to flush away. At the same time, due to the throttling speed increase and throttling pressure increase effect of the spiral groove, the outlet water flow velocity and water flow pressure of the sand flusher are increased, thereby improving the flushing and sand carrying capacity during sand flushing in the horizontal well section.

[0011] Announcement No. CN104047557B discloses a horizontal well vortex sand flushing device, including a vector flushing pipe and an isolation flushing pipe connected by tubing couplings. The isolation flushing pipe includes a tubing short connector and tubing couplings at both ends. The isolation flushing pipe is connected to the vector flushing pipe through the tubing coupling at one end. It can force formation sand to return to the surface during horizontal well sand flushing.

[0012] The aforementioned existing technologies can only use common flushing fluids to flush mud and sand at the bottom of the well. There is no structure that can generate bubble fluid. The bubbles generated from above will gradually disappear after long-distance transport, reducing the flushing and sand-carrying effects. The flushing and sand-carrying effects are limited.

[0013] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of this utility model. For more technical features, technical problems to be solved, and beneficial effects of this utility model, the above-disclosed technical documents do not provide any technical inspiration. Utility Model Content

[0014] In view of the above-mentioned defects in the existing technology, the purpose of this utility model is to provide a horizontal well vortex sand flushing tool and sand flushing string.

[0015] To achieve the above objectives, the present invention adopts the following technical solution:

[0016] On the one hand, this utility model provides a horizontal well vortex sand flushing tool, including a vortex sand flushing pipe, characterized in that it further includes a bubble generating pipe; the bubble generating pipe is a double-layer tubular structure, including an outer pipe, a sandwich layer, and an inner pipe; a bubble generating mechanism is provided at the front end of the sandwich layer of the bubble generating pipe, and a blow-out hole is provided at the rear end of the sandwich layer; the vortex sand flushing pipe is connected to the rear end of the inner pipe.

[0017] Furthermore, the bubble generating mechanism includes a bubble-generating slit;

[0018] Specifically, a flow-blocking ring is provided between the outer wall of the inner tube and the inner wall of the outer tube, and a bubble-forming slit is formed on the flow-blocking ring.

[0019] Furthermore, the bubble generating mechanism also includes a compression ring and a sand-blocking ring;

[0020] Specifically, a compression ring is provided on the upper end face of the baffle ring, the compression ring is integral with the inner tube, the upper end of the compression ring is provided with a first inclined cone surface facing outward, the compression ring and the outer tube form a flow channel, and the bubbling slit corresponds to the flow channel;

[0021] Specifically, a sand-blocking ring is provided at the upper end of the outer tube. The sand-blocking ring protrudes inward to cover the flow channel, and the sand-blocking ring is provided with a second oblique cone surface corresponding to the first oblique cone surface.

[0022] Furthermore, the outer tube is provided with a sand-blowing hole, which is connected to the flow channel;

[0023] Specifically, the blowing hole is an inclined hole, and the inclination of the blowing hole, the first inclined cone surface, and the second inclined cone surface are the same. The number of blowing holes is less than that of the bubbling slits.

[0024] Furthermore, the inner tube of the bubble generating tube is segmented, including an upper section, a middle section, and a lower section.

[0025] Specifically, the upper section of the inner tube is provided with a bubble generating mechanism, the middle section of the inner tube is an elastic pulse tube section, and a sealing ring is provided between the lower section of the inner tube and the outer tube, with a blowout hole provided on the sealing ring.

[0026] Furthermore, the elastic pulse tube segment includes an elastic tube, the elastic tube being provided with a liquid-blocking ring, the interior of which is a cavity.

[0027] Furthermore, the outer wall of the vortex sand-flushing pipe is provided with a scraping guide petal, which is spiral in shape to form a spiral flow channel, and the blowout hole is connected to the spiral flow channel of the scraping guide petal.

[0028] Furthermore, the upper spiral surface of the scraping guide vane forms an angle of 45°-60° with the axis of the swirling sand flushing pipe; the lower spiral surface of the scraping guide vane forms an angle of 45°-60° with the axis of the swirling sand flushing pipe.

[0029] Furthermore, a sand-dredging ring is provided at the bottom of the cyclone sand-flushing pipe;

[0030] Specifically, the outer surface of the sand-digging ring is provided with granular protrusions, the cross-section of the sand-digging ring is circular, and a funnel-shaped structure is formed on the inner wall of the sand-digging ring.

[0031] Secondly, this utility model provides a horizontal well sand flushing string, including tubing, and a horizontal well vortex sand flushing tool as described in one aspect is provided at the bottom of the tubing.

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] 1. This utility model forms relatively fine bubbles by setting a bubble generating tube, which can improve the sand-carrying effect of the well washing fluid.

[0034] 2. This utility model reduces the amount of sand entering the bubble generating tube by setting sand-proof slits, thus avoiding wear and corrosion of the bubble generating tube by mixed sand.

[0035] 3. This utility model improves the bubble generation effect of the bubble generating tube by setting a compression ring, improves the bubble efficiency by first compressing and then expanding, and improves the sand discharge efficiency by cooperating with the sand blowing hole.

[0036] 4. This utility model uses a sand-blowing hole to blow out the incoming sand, thus preventing sand from entering the bubble-generating tube. At the same time, the blown-out sand can agitate the settled sand behind, improving the sand-flushing effect.

[0037] 5. This utility model achieves a pulsed sand flushing method by setting an elastic pulse tube, which can form a water hammer impact effect compared with continuous sand flushing, thus improving the sand flushing efficiency.

[0038] 6. This utility model can crush larger sand and soil by setting a sand-digging ring, which facilitates sand flushing. It can also level the sleeve, thus preventing the tool from getting stuck and becoming unusable during use. By setting a spiral guide petal, a spiral flow channel can be formed, thereby improving the sand flushing effect per unit time. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of a horizontal well vortex sand flushing tool according to this utility model;

[0040] Figure 2 This is a schematic diagram of the structure of the bubble generating tube and the elastic pulse tube in this utility model.

[0041] Figure 3 This is a schematic diagram of the end structure of the vortex sand-washing pipe in this utility model;

[0042] Figure 4 This is a schematic diagram of the structure of a horizontal well sand flushing tubing according to the present invention.

[0043] In the diagram: 1-bubble generating tube, 11-sand-proof slit, 12-sand blowing hole, 13-bubbling slit, 14-bubble chamber, 15-blowing hole, 16-sand-digging ring, 17-flare mouth, 18-compression ring;

[0044] 2-Swirl sand flushing pipe, 21-Scraping guide vane;

[0045] 3-Elastic pulse tube segment, 31-Elastic tube, 32-Moving ball;

[0046] 4-Wellhead, 5-Casing, 6-Tubing, 7-Anti-backflow cup, 8-Center. Detailed Implementation

[0047] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0048] Example 1:

[0049] Please see Figures 1 to 3 This utility model provides a horizontal well vortex sand flushing tool, including a bubble generating tube 1 and a vortex sand flushing tube 2. The bubble generating tube 1 has a double-layer tubular structure, including an outer tube, a sandwich layer 14, and an inner tube. A bubble generating mechanism is provided at the front end of the sandwich layer of the bubble generating tube 1, and a blowout hole 15 is provided at the rear end of the sandwich layer. The vortex sand flushing tube 2 is connected to the rear end of the inner tube. A scraping guide petal 21 is provided on the outer wall of the vortex sand flushing tube 2. The scraping guide petal 21 is spiral in shape, forming a spiral flow channel. The blowout hole 15 is connected to the spiral flow channel of the scraping guide petal 21. The interior of the inner tube and the interior of the vortex sand flushing tube form a central flow channel.

[0050] The bubble generating mechanism includes a bubble-generating slit 13, a flow-blocking ring is provided between the outer wall of the inner tube and the inner wall of the outer tube, the bubble-generating slit 13 is opened on the flow-blocking ring, and the blowing hole 15 is used to blow out the bubbles.

[0051] The outer peripheral surface of the scraping guide petal 21 is provided with a scraping layer. The scraping layer of the scraping guide petal 21 is in contact with the inner wall of the sleeve and can scrape off the sand and dirt. The scraping layer is made of hard alloy and is set on the outer peripheral surface of the scraping guide petal 21 by embedding.

[0052] Specifically, the upper spiral surface of the scraping guide vane 21 forms a 45° angle with the axis of the vortex sand flushing pipe 2, and the lower spiral surface of the scraping guide vane 21 forms a 60° angle with the axis of the vortex sand flushing pipe 2, which facilitates the formation of vortex flow and thus improves the sand flushing efficiency.

[0053] Specifically, the rear end periphery of the scraping guide flap 21 is provided with a 45° chamfer to guide and prevent the drill from getting stuck.

[0054] Working principle:

[0055] The operator lowers this sand-removing tool to the horizontal well section, and then various methods can be used for sand removal, or a combination of sand removal methods can be used:

[0056] 1. Rotate this sand-washing tool. The scraping guide vane 21 is spiral-shaped, which can agitate the sand in the casing and then draw the raised sand away from the central flow channel.

[0057] 2. Inject foaming chemicals into the annulus between the tubing and the casing. When these chemicals pass through the foaming slit 13, they form fine foam due to changes in flow velocity and fluid oscillation. The foam passes through the interlayer 14 and enters the spiral flow channel of the scraping guide vane 21 through the blowout hole 15. Due to the adhesion of the bubbles, they will adhere to the surface of the sand particles. This is equivalent to tying balloons to the sand particles, which can effectively reduce the influence of gravity on the sand particles, thereby blowing up the sand and cleaning the inner wall of the casing.

[0058] 3. Use two methods in combination: first, use the scraping guide vane 21 to agitate the sand in the casing, and then inject a foaming chemical agent. The agitation will cause the sand particles to be carried into the hollow flow channel by the air bubbles, thereby improving the sand carrying effect.

[0059] Compared with existing sand-washing tools, the sand-washing tool provided in this embodiment combines a bubble generating tube 1, which can generate a large number of bubbles. The adhesion of bubbles to sand particles can increase the sand-carrying capacity, thereby increasing the sand removal efficiency. By setting scraping guide vanes 21, a spiral flow channel can be formed, thereby improving the sand-washing effect per unit time.

[0060] Example 2:

[0061] Based on Example 1, this example proposes further improvements to the bubble generating mechanism. The bubble generating mechanism also includes a compression ring 18 and a sand-blocking ring.

[0062] A compression ring 18 is provided on the upper end face of the baffle ring. The compression ring 18 is integral with the inner tube. The upper end of the compression ring 18 is provided with a first oblique cone surface facing outward. There is a flow channel between the compression ring 18 and the outer tube. The bubbling slit 13 corresponds to the flow channel.

[0063] A sand-blocking ring is provided at the upper end of the outer tube. The sand-blocking ring protrudes inward to cover the flow channel. The sand-blocking ring is provided with a second oblique cone surface corresponding to the first oblique cone surface. The space between the sand-blocking ring and the inner tube is a sand-proof slit 11.

[0064] The compression ring 18 enhances the foaming effect. As the liquid is compressed as it passes through the compression ring 18, it expands in volume after passing through the foaming slit 13, making it easier to form fine bubbles when combined with chemical agents.

[0065] Among them, the sand-blocking ring is used to form a sand-proof slit 11 to prevent fine sand at the bottom of the casing from being blown into the interior of the bubble generating tube 1, causing blockage of the bubbling slit 13.

[0066] Example 3:

[0067] Based on Example 2, the sand-proof capability of the bubble generating mechanism is further improved. The outer tube is provided with a sand-blowing hole 12, which is connected to the flow channel. The sand-blowing hole 12 is an inclined hole. The slope of the sand-blowing hole 12, the first inclined cone surface, and the second inclined cone surface are consistent. The number of sand-blowing holes 12 is less than that of the bubble-generating slits 13.

[0068] The sand blowing hole 12, the sand blocking ring, and the compression ring 18 work together to form a guiding sand blowing structure.

[0069] Because there is too much sand in the well, a hole is needed to discharge the sand particles when they enter the bubble generating tube 1 through the sand-proof slit 11. Therefore, a sand-blowing hole 12 is provided. When the subsequent liquid enters through the sand-proof slit 11, it will push the sand particles forward into the sand-blowing hole 12 and be discharged. The liquid discharge in the sand-blowing hole 12 creates a low pressure. Because the discharge speed is relatively fast, it can agitate the sand deposited on the inner wall of the casing, thereby improving the sand flushing effect. The fluid that cannot enter the sand-blowing hole 12 due to the flow limit can continue to flow backward through the bubbling slit 13 into the bubble generating tube 1.

[0070] Example 4:

[0071] Based on Example 3, this example adds an elastic pulse tube segment 3.

[0072] The inner tube of the bubble generating tube 1 is divided into sections, one of which is an elastic pulse tube section 3. The elastic pulse tube section 3 includes an elastic tube 31, and the elastic tube 31 is provided with a liquid blocking ring 32. The liquid blocking ring 32 has a cavity inside.

[0073] The elastic tube 31 and the liquid-blocking ring 32 are used to form a pulse water flow and flush away the sediment.

[0074] Specifically, the elastic tube 31 is made of wear-resistant rubber, and the liquid-blocking ring 32 has a hemispherical structure. The wear-resistant material is to prevent wear and breakage caused by long-term use at the bottom of the well, and the hemispherical shape is to ensure that the inner wall of the elastic tube 31 is flat and will not form protrusions that would cause sand to settle and hinder the movement of mud and sand.

[0075] Specifically, the inner tube includes an upper section, a middle section, and a lower section. The upper section is equipped with a bubble generating mechanism, the middle section is an elastic pulse tube section 3, and a sealing ring is provided between the lower section and the outer tube. A blowout hole 15 is provided on the sealing ring.

[0076] Specifically, the outer tube, the upper section of the inner tube, and the lower section of the inner tube are made of alloy material.

[0077] Specifically, the upper section of the inner tube is threadedly connected to the inner wall of the outer tube via a baffle ring, the middle section of the inner tube is connected to the upper and lower sections of the inner tube via a stepped snap joint, the lower section of the inner tube is threadedly connected to the inner wall of the outer tube via a sealing ring, and the upper end of the vortex sand flushing pipe is threadedly connected to the lower section of the lower inner tube; wherein, the fixed upper and lower sections of the inner tube limit the movement of the middle section of the inner tube.

[0078] Working principle:

[0079] 1. As the pressure decreases when the liquid flows through a narrow area, deformation will occur when the pressure inside and outside the elastic tube 31 is inconsistent;

[0080] When the pressure inside the interlayer 14 is lower than the pressure inside the central flow channel, the elastic tube 31 drives the liquid-blocking ring 32 to move. The liquid-blocking ring 32 is driven to move outward, blocking the interlayer 14, causing the liquid pressure inside the interlayer 14 to increase. After the pressure difference weakens, the elastic tube 31 retracts under its own elasticity, driving the liquid-blocking ring 32 back. The liquid inside the interlayer 14 resumes flow and the pressure decreases. The elastic tube 31 drives the liquid-blocking ring 32 to move, and the liquid-blocking ring 32 is driven to move outward. In this way, a periodic reciprocating expansion and contraction motion is formed.

[0081] 2. The fluid flowing through the slits repeatedly opens and closes in this periodic expansion and contraction motion, forming a pulsed fluid flow, which is equivalent to a small water hammer.

[0082] When this small water hammer is blown out of the blowout hole 15, it impacts the sediment, making it easier to break up the sediment than a continuous flow of water.

[0083] 3. The effect is the opposite for the inside of the elastic tube 31. When the elastic tube 31 expands outward, the internal space becomes larger, which will draw in the sand-containing liquid flow behind. When the elastic tube 31 contracts, it will discharge this part of the sand-containing liquid flow forward, thus helping to remove sand.

[0084] A pulsed fluid flow is formed outside the elastic tube 31, and the inside of the elastic tube 31 cooperates with the rear vortex sand flushing tube 2 to assist in flushing. The elastic tube 31 blows chemicals or liquid containing air bubbles into the rear horizontal well bottom, and then after the fluid flow completes the sand flushing action, it plays a suction role, drawing the fluid carrying mud and sand into the internal pipe, and then discharging it forward.

[0085] Example 5:

[0086] Based on Example 4, this example further improves the sand-washing tool's crushing effect on sand and soil, and a sand-digging ring 16 is provided at the bottom of the vortex sand-washing pipe 2.

[0087] The outer surface of the sand-digging ring 16 is provided with granular protrusions for crushing sand.

[0088] The sand-digging ring 16 has a circular cross-section, and a funnel-shaped opening 17 is formed on the inner wall of the sand-digging ring 16. The purpose of setting the funnel opening 17 is to increase the cross-sectional area for suction, thereby improving the efficiency of suction of sand-carrying fluid.

[0089] This sand flushing tool can crush larger sand and soil by setting a sand-digging ring 16 at the front end of the vortex sand flushing pipe 2, which facilitates sand flushing and can also level the casing, thus preventing the tool from being stuck due to protrusions and unable to be used for sand flushing.

[0090] Example 6:

[0091] Please see Figure 4 This embodiment provides a horizontal well sand flushing string, including tubing 6, on which anti-backflow cups 7 and centralizers 8 are provided. At the bottom of the tubing, a horizontal well vortex sand flushing tool as described in Embodiment 5 is provided. The tubing 6 is connected to the inner tube thread of the bubble generating tube 1.

[0092] Among them, the anti-backflow cup 7 is used to prevent liquid backflow in the air from the oil sleeve ring, and other sealing tools can also be used.

[0093] Among them, the centralizer 8 avoids damage to the casing.

[0094] A method for using a horizontal well sand flushing string includes the following steps:

[0095] S1. A horizontal well sand flushing string is lowered into the casing;

[0096] S2. Lifting, lowering, or rotating a horizontal well sand flushing string to scrape the sand deposited in the horizontal well section using the scraping guide vane 21 and the sand-digging ring 16.

[0097] S3. Inject washing fluid into the annulus from the wellhead. Add a foaming agent to the washing fluid. In the horizontal section, part of the washing fluid enters the bubble generating mechanism of the bubble generating pipe 1, generating a large number of bubbles. The bubbles are ejected from the blowout hole 15 and flush the inner wall of the casing 5 in the spiral flow channel of the scraping guide vane 21. The washing fluid enters the central flow channel from the bell mouth 17, flows back into the tubing 6, and flows back out from the wellhead.

[0098] During this period, the elastic tube 31 of the bubble generating tube 1 expands and contracts repeatedly under the action of the pressure difference on both sides, causing the bubbles that rush out of the bubble generating tube 1 to be in the form of pulse jets.

[0099] It should be noted that the foaming agent is existing technology and can be purchased. The wellhead 4 and the anti-backflow cup 7 are also existing technologies, and their structures are clear to those skilled in the art.

[0100] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0101] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0102] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0103] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0104] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A horizontal well cyclone sand washing tool comprising a cyclone sand washing pipe, characterized in that, It also includes a bubble generating tube; The bubble generating tube has a double-layer tubular structure, including an outer tube, a sandwich layer, and an inner tube; The front end of the interlayer of the bubble generating tube is provided with a bubble generating mechanism, and the rear end of the interlayer is provided with a blowout hole; The vortex sand-washing pipe is connected to the rear end of the inner pipe.

2. The horizontal well cyclone sand washing tool of claim 1, wherein, The bubble generating mechanism includes a bubble-generating slit; A flow-blocking ring is provided between the outer wall of the inner tube and the inner wall of the outer tube, and a bubble-forming slit is formed on the flow-blocking ring.

3. The horizontal well cyclone sand washing tool of claim 2, wherein, The bubble generating mechanism also includes a compression ring and a sand-blocking ring; A compression ring is provided on the upper end face of the baffle ring. The compression ring is integral with the inner tube. The upper end of the compression ring is provided with a first inclined conical surface facing outward. There is a flow channel between the compression ring and the outer tube. The bubbling slit corresponds to the flow channel. A sand-blocking ring is provided at the upper end of the outer tube. The sand-blocking ring protrudes inward to cover the flow channel. The sand-blocking ring is provided with a second oblique cone surface corresponding to the first oblique cone surface.

4. The horizontal well cyclone sand washing tool of claim 3, wherein, The outer tube is provided with a sand blowing hole, which is connected to the flow channel; The blowing hole is an inclined hole, and the inclination of the blowing hole, the first inclined cone surface, and the second inclined cone surface is the same. The number of blowing holes is less than that of the bubbling slit.

5. The horizontal well cyclone sand washing tool of claim 1, wherein, The inner tube of the bubble generating tube is divided into three sections: an upper section, a middle section, and a lower section. The upper section of the inner tube is equipped with a bubble generating mechanism, the middle section of the inner tube is an elastic pulse tube section, and a sealing ring is provided between the lower section of the inner tube and the outer tube, with a blow-out hole provided on the sealing ring.

6. The horizontal well cyclone sand washing tool of claim 5, wherein, The elastic pulse tube segment includes an elastic tube, and the elastic tube is provided with a liquid-blocking ring, the inside of which is a cavity.

7. The horizontal well cyclone sand washing tool of claim 1, wherein, The outer wall of the vortex sand-flushing pipe is provided with scraping guide petals, which are spiral in shape to form a spiral flow channel. The blowout hole is connected to the spiral flow channel of the scraping guide petals.

8. The horizontal well cyclone sand washing tool of claim 7, wherein, The upper spiral surface of the scraping guide vane forms an angle of 45°-60° with the axis of the swirling sand flushing pipe; the lower spiral surface of the scraping guide vane forms an angle of 45°-60° with the axis of the swirling sand flushing pipe.

9. The horizontal well cyclone sand washing tool of claim 1, wherein, A sand-dredging ring is provided at the bottom of the cyclone sand-flushing pipe; The outer surface of the sand-digging ring is provided with granular protrusions, the cross-section of the sand-digging ring is circular, and a funnel-shaped structure is formed on the inner wall of the sand-digging ring.

10. A sand washing pipe string for a horizontal well comprising a tubing, characterized in that, The bottom of the tubing is provided with a horizontal well vortex sand flushing tool as described in any one of claims 1-9.

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