Anti-blocking pressure-resistant anti-erosion sand control screen pipe
By improving the structure of the outer protective sleeve, adopting a high-pressure-bearing winding layer and extruded end ring fixing method, the blockage and damage problems of sandproof screen pipes in the development of loose sandstone blocks are solved, the liquid inlet capacity and high pressure resistance are improved, and the preparation cost is reduced.
Patent Information
- Application Number
- CN202520545106.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2035-03-26
AI Technical Summary
In the development of loose sandstone oil, gas and water blocks, existing sandproof screens are prone to blockage of small particles in the formation and high-pressure sand-containing liquids to destroy the filter layer, resulting in a decrease in liquid inlet capacity and shortening service life.
By changing the long countersunk hole of the outer protective sleeve to a protruding cylindrical liquid inlet cap, combining a high-pressure-bearing winding layer to wrap around the outer ring of the filter mesh, and fixing the inner and outer protective sleeve and filter mesh through an extruded end ring, reducing welding process and cost.
Effectively prevent large-grain sand particles from getting stuck and ensuring liquid inlet capacity; high-pressure-bearing winding layer protects the filter screen to enhance high pressure resistance; extruded end ring fixing method simplifies the process and reduces preparation costs.
Smart Images
Figure CN222823222U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sand-proof screen pipes for the petroleum industry, in particular to an anti-clogging, pressure-resistant, erosion-resistant sand-proof screen pipe. Background Art
[0002] In the process of drilling and completion or oil production in oil fields, the filter-type sand screen is a commonly used downhole tool, which is mainly composed of a base pipe, a filter layer, and a protective sleeve. The base pipe is generally made of a slit screen pipe or a perforated pipe; the filter layer is generally wrapped layer by layer with 3-7 layers of stainless steel woven wire mesh and then welded into a filter pipe with resistance welding, which is sleeved outside the base pipe to control sand and filter; the protective sleeve is usually a straight-seam welded perforated pipe or a spiral welded mesh pipe with a wall thickness of 1.2-1.5mm, which protects the screen. However, when developing loose sandstone oil, gas and water blocks, it is easy for fine particles in the formation to block the filter layer. In addition, high-pressure sand-containing liquids can easily cause strong destructive effects on the filter layer, reducing the service life of the sand screen.
[0003] The Chinese patent number is ZL200720173058.1, which discloses an anti-erosion sand screen pipe, including a base pipe and an anti-erosion sand screen sleeve, wherein the base pipe is provided with a flow hole, and the anti-erosion sand screen sleeve covers the flow hole section of the base pipe; the anti-erosion sand screen sleeve includes an inner protective sleeve, a multi-layer metal mesh filter layer and an outer protective sleeve, wherein the inner protective sleeve, the multi-layer metal mesh filter layer and the outer protective sleeve are arranged in sequence from the inside to the outside, and the inner protective sleeve and the outer protective sleeve are both provided with flow holes. Due to the anti-erosion sand screen sleeve structural design, the utility model has many advantages such as good anti-erosion performance, long service life, and strong anti-deformation ability. However, the following problems still exist: 1. Although the outer protective sleeve structure of the long countersunk hole can change the flow direction of the fluid, the structure of the long countersunk hole is concave toward the center of the tube, and the sand-containing liquid flows in from the outside to the inside. This causes large particles of sand to be stuck in the side holes of the long countersunk hole under pressure, resulting in a significant decrease in the liquid inlet capacity, and the blockage problem can only be solved by stopping the well and reverse circulation; 2. Although the high-pressure sand-containing liquid changes the flow direction, it still has a horizontal destructive effect on the surface layer of the multi-layer metal mesh filter layer, causing the filter to be damaged frequently and having poor pressure resistance; 3. The existing inner protective sleeve is fixed by an inner support ring, and the outer protective sleeve is fixed by an outer support ring. The multi-layer metal mesh filter layer is pressed against the outer wall of the inner protective sleeve by a clamping ring, which requires multi-stage welding, resulting in cumbersome procedures and the inability to effectively reduce the preparation cost. Utility Model Content
[0004] The purpose of the utility model is to provide an anti-clogging, pressure-resistant, erosion-resistant and sand-proof screen pipe in view of the above-mentioned defects in the prior art. On the one hand, by changing the long countersunk hole of the outer protective sleeve into a protruding cylindrical liquid inlet cap, the side holes formed by the base pipe and the cylindrical liquid inlet cap will not get stuck with large particles of sand, thereby ensuring that the liquid inlet capacity will not be greatly reduced; on the other hand, by using a high-pressure winding layer to wrap around the outer ring of the filter screen, the filter screen, the guide layer and the inner protective sleeve are effectively fastened, thereby protecting the filter screen; thirdly, the inner protective sleeve, the guide layer, the filter screen, the high-pressure winding layer and the two ends of the outer protective sleeve are fixed by extrusion-type end rings, and are fixed to the outer wall of the base pipe at one level by welding, thereby reducing the welding process and the preparation cost.
[0005] The utility model mentions an anti-clogging, pressure-resistant, erosion-resistant and sand-proof screen pipe, and its technical scheme is: comprising a base pipe, an inner protective sleeve, a guide layer, a filter screen, and an outer protective sleeve, slits or through holes are distributed on the pipe wall of the base pipe, and the inner protective sleeve is installed outside the slits or through holes, more than one group of guide layers and filter screens are installed outside the inner protective sleeve, and the outer protective sleeve is installed outside the outermost filter screen, wherein it also includes a high-pressure winding layer and an extrusion-type end ring, and the high-pressure winding layer is arranged outside the outermost filter screen, and the high-pressure winding layer is composed of winding wire or winding belt; cylindrical liquid inlet caps protruding outward are evenly distributed on the outer wall of the outer protective sleeve, and more than one side hole is provided in the middle of the cylindrical liquid inlet cap; the two ends of the inner protective sleeve, the guide layer, the filter screen, the high-pressure winding layer and the outer protective sleeve are squeezed together by the extrusion-type end ring, and the outer end of the extrusion-type end ring is fixed to the pipe wall of the base pipe by welding.
[0006] Preferably, three side holes are provided in the middle of the outer wall of the cylindrical liquid inlet cap, and the three side holes are evenly distributed at 120 degrees.
[0007] Preferably, the height of the cylindrical liquid inlet cap is smaller than the diameter.
[0008] Preferably, two groups of guide layers and two groups of filter screens are provided on the outside of the inner protective sleeve and are arranged at intervals. The guide layers and filter screens are made of stainless steel meshes, and the inner diameter of the mesh of the guide layer is larger than the inner diameter of the mesh of the filter screen.
[0009] Preferably, the inner protective sleeve comprises a stainless steel belt, liquid holes and spiral welds, a plurality of liquid holes are evenly distributed on the surface of the stainless steel belt, the stainless steel belt is formed by spiral coil welding, and the stainless steel belts are fixedly connected by spiral welds.
[0010] Preferably, the winding wire is made of metal wire and is evenly wound around the outermost filter screen to form a spiral winding structure.
[0011] Preferably, the winding belt is made of a long metal mesh and is evenly wound around the outermost filter mesh to form a spiral winding structure.
[0012] Preferably, the winding wire is made of high-strength composite material wire and is evenly wound on the outermost filter screen to form a spiral winding structure.
[0013] Preferably, the winding belt is made of a high-strength composite material net in the shape of a long strip, and is evenly wound on the outermost filter net to form a spiral winding structure.
[0014] The beneficial effects of the utility model are:
[0015] Firstly, the outer wall of the outer protective sleeve of the utility model is evenly distributed with cylindrical liquid inlet caps protruding outward, and the sand-containing liquid enters the inner cavity along the side holes. Among them, since the connection between the cylindrical liquid inlet cap and the base pipe is an arc structure, and the side holes are located in the middle of the outer wall of the cylindrical liquid inlet cap, under the action of high pressure, large particles of sand will not be stuck at the side holes, thereby ensuring that the liquid inlet capacity will not be greatly reduced;
[0016] Secondly, the high-pressure winding layer of the utility model adopts winding wire or winding belt, which is wound around the outer ring of the filter screen to effectively fasten the filter screen, the guide layer and the inner protective sleeve, thereby protecting the filter screen, overcoming the impact damage of the sand-containing liquid in the formation on the filter screen, and playing a role in high pressure resistance;
[0017] In addition, the two ends of the inner protective sleeve, guide layer, filter screen, high pressure-bearing winding layer and outer protective sleeve of the utility model are extruded and fixed together by extrusion-type end rings, and the outer end of the extrusion-type end ring is fixed to the pipe wall of the base pipe by welding, which not only reduces the difficulty of fixing, but also improves the fixing effect and reduces the welding cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0019] Figure 2 It is a partial enlarged schematic diagram of the A part of the utility model;
[0020] Figure 3 It is a schematic structural diagram of the extruded end ring of the A part of the utility model before necking;
[0021] Figure 4 It is a schematic diagram of the structure of the extruded end ring;
[0022] Figure 5 is a schematic diagram of the structure of the inner protective cover;
[0023] Figure 6 is a schematic diagram of the structure of the outer protective cover;
[0024] Figure 7 It is an enlarged schematic diagram of the connection between the cylindrical liquid inlet cap and the outer protective sleeve;
[0025] Figure 8 It is a schematic diagram of the structure in which the winding wire is wound around the filter screen;
[0026] Fig. 9 It is a schematic diagram of the structure in which the wrapping belt is wrapped around the filter screen;
[0027] In the figure above: base pipe 1, inner protective sleeve 2, guide layer 3, filter screen 4, high pressure winding layer 5, outer protective sleeve 6, extruded end ring 7, coupling 8, slit 9, weld 10, stainless steel belt 2.1, liquid hole 2.2, spiral weld 2.3, cylindrical liquid inlet cap 6.1, side hole 6.2. DETAILED DESCRIPTION
[0028] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.
[0029] Example 1, reference Figure 1-Figure 7 The utility model mentions an anti-clogging, pressure-resistant, erosion-resistant and sand-proof screen pipe, comprising a base pipe 1, an inner protective sleeve 2, a guide layer 3, a filter screen 4, and an outer protective sleeve 6. Slits 9 or through holes are distributed on the pipe wall of the base pipe 1, and the inner protective sleeve 2 is installed outside the slits 9 or through holes, and one or more guide layers 3 and filter screens 4 are installed outside the inner protective sleeve 2. The outer protective sleeve 6 is installed outside the outermost filter screen 4, wherein a high-pressure winding layer 5 and an extruded end ring 7 are also included. The outermost filter screen 4 is provided with a plurality of guide layers 3 and filter screens 4. A high-pressure winding layer 5 is installed, and the high-pressure winding layer 5 is composed of winding wire or winding tape; cylindrical liquid inlet caps 6.1 protruding outward are evenly distributed on the outer wall of the outer protective sleeve 6, and one or more side holes 6.2 are provided in the middle of the cylindrical liquid inlet cap 6.1; the inner protective sleeve 2, the guide layer 3, the filter screen 4, the high-pressure winding layer 5 and the two ends of the outer protective sleeve 6 are squeezed together by an extrusion type end ring 7, and the outer end of the extrusion type end ring 7 is fixed to the pipe wall of the base pipe 1 by welding.
[0030] Reference Figure 6 and Figure 7 The cylindrical liquid inlet cap 6.1 mentioned in the utility model is provided with three arc-shaped side holes 6.2 in the middle of the outer wall, and the three arc-shaped side holes 6.2 are evenly distributed at 120 degrees, and the sand-containing liquid enters the inner cavity along the side holes 6.2. Among them, since the connection between the cylindrical liquid inlet cap 6.1 and the base pipe 1 is an arc-shaped structure, and the side holes 6.2 are located in the middle of the outer wall of the cylindrical liquid inlet cap 6.1, under the action of high pressure, large particles of sand will not be stuck in the side holes 6.2, thereby ensuring that the liquid intake capacity of the utility model will not be greatly reduced.
[0031] In addition, the height of the cylindrical liquid inlet cap 6.1 is shorter than its diameter, which reduces the outward protrusion of the cylindrical liquid inlet cap 6.1 and enhances its strength, thereby preventing the cylindrical liquid inlet cap 6.1 from falling off due to external collision.
[0032] Reference Figure 2 Two groups of guide layers 3 and two groups of filter screens 4 are provided on the outside of the inner protective sleeve 2 and are arranged at intervals. The guide layers 3 and filter screens 4 are made of stainless steel meshes. The inner diameter of the mesh of the guide layer 3 is larger than the inner diameter of the mesh of the filter screen 4, thereby playing a guiding role and enhancing the liquid passing capacity.
[0033] Reference Figure 3 and Figure 4 The inner side of one end of the extruded end ring 7 mentioned in the utility model is a bell-mouth structure, which is used to more smoothly extrude the outer protective sleeve 6, the high-pressure winding layer 5, the filter screen 4, the guide layer 3 and the inner protective sleeve 2, and plays a better transition and fixing role. In addition, a plurality of groups of teeth can be evenly distributed on the inner wall of the extruded end ring 7, which can better fix the outer wall of the outer protective sleeve 6 and reduce slipping; in addition, the outer end of the extruded end ring 7 is fixed to the pipe wall of the base pipe 1 by welding to form a weld 10, thereby avoiding the problem of instability caused by directly welding the filter screen 4 to the base pipe 1 in the prior art.
[0034] Reference Figure 5 The inner protective sleeve 2 mentioned in the utility model includes a stainless steel strip 2.1, liquid holes 2.2 and a spiral weld 2.3. A plurality of liquid holes 2.2 are evenly distributed on the surface of the stainless steel strip 2.1. The stainless steel strip 2.1 is formed by spiral coil welding, and the stainless steel strips 2.1 are fixedly connected by the spiral weld 2.3. In addition, the liquid holes 2.2 of the inner protective sleeve 2 can adopt a countersunk structure to improve the liquid flow capacity.
[0035] Reference Figure 8 The winding wire mentioned in the utility model is made of stainless steel wire and is evenly wound on the outermost filter screen 4 to form a spiral winding structure, which effectively fastens the filter screen 4, the guide layer 3 and the inner protective cover 2.
[0036] When the utility model is used, it is connected to the oil pipe and the coupling 8 and lowered into the well, and the sand-containing liquid enters the high-pressure winding layer 5 through the cylindrical liquid inlet cap 6.1 evenly distributed on the outer wall of the outer protective sleeve 6. Among them, since the connection between the cylindrical liquid inlet cap 6.1 and the base pipe 1 is an arc structure, and the side hole 6.2 is located in the middle of the outer wall of the cylindrical liquid inlet cap 6.1, under the action of high pressure, large particles of sand will not be stuck at the side hole 6.2, thereby ensuring that the liquid intake capacity will not be greatly reduced, avoiding the problem of well shutdown reverse circulation operation; in addition, since the high-pressure winding layer 5 uses stainless steel wire and is evenly wound on the outermost filter screen 4 to form a spiral winding structure, by winding on the outer ring of the filter screen 4, the filter screen 4, the guide layer 3 and the inner protective sleeve 2 are effectively tightened. , thereby protecting the filter screen 4, overcoming the impact damage of the sand-containing liquid in the formation on the filter screen 4, and playing a role of high pressure resistance; then, the sand-containing liquid passes along the first-stage filter screen 4 and the guide layer 3, and then passes through the second-stage filter screen 4 and the guide layer 3, the sand-containing particles are isolated on the outside by the filter screen 4, and the liquid smoothly enters the inner protective sleeve 2, and then enters the inner cavity of the base pipe 1 along the slit 9 or through hole of the base pipe 1, thereby realizing the sand prevention function; in addition, the two ends of the inner protective sleeve 2, the guide layer 3, the filter screen 4, the high-pressure winding layer 5 and the outer protective sleeve 6 of the utility model are squeezed and fixed together by the extrusion type end ring 7, and the outer end of the extrusion type end ring 7 is fixed to the pipe wall of the base pipe 1 by welding, which not only reduces the difficulty of fixing, but also improves the fixing effect, reduces the welding cost, and prolongs the service life of the screen pipe.
[0037] Embodiment 2, the utility model mentions an anti-clogging, pressure-resistant, erosion-resistant and sand-proof screen pipe, comprising a base pipe 1, an inner protective sleeve 2, a guide layer 3, a filter screen 4, and an outer protective sleeve 6, wherein slits 9 or through holes are distributed on the pipe wall of the base pipe 1, and the inner protective sleeve 2 is installed outside the slits 9 or through holes, and one or more guide layers 3 and filter screens 4 are installed outside the inner protective sleeve 2, and the outer protective sleeve 6 is installed outside the outermost filter screen 4, wherein the high-pressure winding layer 5 and the extrusion type end ring 7 are also included, and the outermost filter screen 4 is provided with a plurality of guide layers 3 and filter screens 4. A high-pressure winding layer 5 is arranged outside, and the high-pressure winding layer 5 is made of winding wire or winding tape; cylindrical liquid inlet caps 6.1 protruding outward are evenly distributed on the outer wall of the outer protective sleeve 6, and one or more side holes 6.2 are provided in the middle of the cylindrical liquid inlet cap 6.1; the inner protective sleeve 2, the guide layer 3, the filter screen 4, the high-pressure winding layer 5 and the two ends of the outer protective sleeve 6 are squeezed together by an extrusion type end ring 7, and the outer end of the extrusion type end ring 7 is fixed to the pipe wall of the base pipe 1 by welding.
[0038] The difference from Example 1 is:
[0039] Reference Fig. 9The winding belt of this embodiment is made of a long metal mesh belt and is evenly wound around the outermost filter screen 4 to form a spiral winding structure. It can not only firmly fix the filter screen 4, the guide layer 3 and the inner protective cover 2, but also the spaced metal mesh belts improve the fastening effect and do not affect the liquid permeability filtering function of the filter screen 4.
[0040] Embodiment 3, the utility model mentions an anti-clogging, pressure-resistant, erosion-resistant and sand-proof screen pipe, comprising a base pipe 1, an inner protective sleeve 2, a guide layer 3, a filter screen 4, and an outer protective sleeve 6, wherein slits 9 or through holes are distributed on the pipe wall of the base pipe 1, and the inner protective sleeve 2 is installed outside the slits 9 or through holes, and one or more guide layers 3 and filter screens 4 are installed outside the inner protective sleeve 2, and the outer protective sleeve 6 is installed outside the outermost filter screen 4, wherein the high-pressure winding layer 5 and the extrusion type end ring 7 are also included, and the outermost filter screen 4 is provided with a plurality of guide layers 3 and filter screens 4. A high-pressure winding layer 5 is arranged outside, and the high-pressure winding layer 5 is made of winding wire or winding tape; cylindrical liquid inlet caps 6.1 protruding outward are evenly distributed on the outer wall of the outer protective sleeve 6, and one or more side holes 6.2 are provided in the middle of the cylindrical liquid inlet cap 6.1; the inner protective sleeve 2, the guide layer 3, the filter screen 4, the high-pressure winding layer 5 and the two ends of the outer protective sleeve 6 are squeezed together by an extrusion type end ring 7, and the outer end of the extrusion type end ring 7 is fixed to the pipe wall of the base pipe 1 by welding.
[0041] The difference from Example 1 is:
[0042] The winding wire mentioned in this embodiment is made of high-strength composite material wire and is evenly wound on the outermost filter screen 4 to form a spiral winding structure. It can also firmly fix the filter screen 4, the guide layer 3 and the inner protective cover 2, playing a tightening role.
[0043] Embodiment 4, the utility model mentions an anti-clogging, pressure-resistant, erosion-resistant and sand-proof screen pipe, comprising a base pipe 1, an inner protective sleeve 2, a guide layer 3, a filter screen 4, and an outer protective sleeve 6, wherein slits 9 or through holes are distributed on the pipe wall of the base pipe 1, and the inner protective sleeve 2 is installed outside the slits 9 or through holes, and one or more guide layers 3 and filter screens 4 are installed outside the inner protective sleeve 2, and the outer protective sleeve 6 is installed outside the outermost filter screen 4, wherein the high-pressure winding layer 5 and the extrusion type end ring 7 are also included, and the outermost filter screen 4 is provided with a plurality of guide layers 3 and filter screens 4. A high-pressure winding layer 5 is arranged outside, and the high-pressure winding layer 5 is made of winding wire or winding tape; cylindrical liquid inlet caps 6.1 protruding outward are evenly distributed on the outer wall of the outer protective sleeve 6, and one or more side holes 6.2 are provided in the middle of the cylindrical liquid inlet cap 6.1; the inner protective sleeve 2, the guide layer 3, the filter screen 4, the high-pressure winding layer 5 and the two ends of the outer protective sleeve 6 are squeezed together by an extrusion type end ring 7, and the outer end of the extrusion type end ring 7 is fixed to the pipe wall of the base pipe 1 by welding.
[0044] The difference from Example 2 is:
[0045] The winding belt mentioned in this embodiment adopts a high-strength composite material net in the shape of a long strip, and is evenly wound on the outermost filter screen 4 to form a spiral winding structure, which can also firmly fix the filter screen 4, the guide layer 3 and the inner protective cover 2, playing a tightening role.
[0046] The above is only a preferred embodiment of the utility model. Any person skilled in the art may modify the utility model by using the above technical solution or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent transformation based on the technical solution of the utility model shall fall within the scope of protection claimed by the utility model.
Claims
1. An anti-clogging, pressure-resistant, erosion-resistant and sand-proof screen pipe, comprising a base pipe (1), an inner protective sleeve (2), a guide layer (3), a filter screen (4), and an outer protective sleeve (6), wherein slits (9) or through holes are distributed on the pipe wall of the base pipe (1), and the inner protective sleeve (2) is installed outside the slits (9) or through holes, and one or more guide layers (3) and filter screens (4) are installed outside the inner protective sleeve (2), and the outer protective sleeve (6) is installed outside the outermost filter screen (4), wherein: It also includes a high-pressure winding layer (5) and an extruded end ring (7), wherein the high-pressure winding layer (5) is arranged outside the outermost filter screen (4), and the high-pressure winding layer (5) is made of winding wire or winding tape; cylindrical liquid inlet caps (6.1) protruding outward are evenly distributed on the outer wall of the outer protective sleeve (6), and one or more side holes (6.2) are provided in the middle of the cylindrical liquid inlet cap (6.1); the inner protective sleeve (2), the guide layer (3), the filter screen (4), the high-pressure winding layer (5) and the outer protective sleeve (6) are squeezed together at both ends by the extruded end ring (7), and the outer end of the extruded end ring (7) is fixed to the pipe wall of the base pipe (1) by welding.
2. The anti-clogging, pressure-resistant, erosion-resistant and sand-control screen pipe according to claim 1 is characterized by: Three side holes (6.2) are provided in the middle of the outer wall of the cylindrical liquid inlet cap (6.1), and the three side holes (6.2) are evenly distributed at 120 degrees.
3. The anti-clogging, pressure-resistant, erosion-resistant and sand-control screen pipe according to claim 2 is characterized by: The height of the cylindrical liquid inlet cap (6.1) is smaller than the diameter.
4. The anti-clogging, pressure-resistant, erosion-resistant and sand-control screen pipe according to claim 3 is characterized by: Two groups of guide layers (3) and two groups of filter screens (4) are arranged on the outside of the inner protective sleeve (2) and are arranged at intervals. The guide layers (3) and filter screens (4) are made of stainless steel meshes. The inner diameter of the mesh of the guide layer (3) is larger than the inner diameter of the mesh of the filter screen (4).
5. The anti-clogging, pressure-resistant, erosion-resistant and sand-control screen pipe according to claim 4 is characterized by: The inner protective sleeve (2) comprises a stainless steel strip (2.1), liquid holes (2.2) and a spiral weld (2.3); a plurality of groups of liquid holes (2.2) are evenly distributed on the surface of the stainless steel strip (2.1); the stainless steel strip (2.1) is formed by spiral coil welding, and the stainless steel strips (2.1) are fixedly connected by the spiral weld (2.3).
6. The anti-clogging, pressure-resistant, erosion-resistant and sand-control screen pipe according to claim 5 is characterized by: The winding wire is made of metal wire and is evenly wound around the outermost filter screen (4) to form a spiral winding structure.
7. The anti-clogging, pressure-resistant, erosion-resistant and sand-control screen pipe according to claim 5 is characterized by: The winding belt is made of a long metal mesh and is evenly wound around the outermost filter mesh (4) to form a spiral winding structure.
8. The anti-clogging, pressure-resistant, erosion-resistant and sand-control screen pipe according to claim 5 is characterized by: The winding wire is made of a high-strength composite material wire and is evenly wound around the outermost filter screen (4) to form a spiral winding structure.
9. The anti-clogging, pressure-resistant, erosion-resistant and sand-control screen pipe according to claim 5 is characterized by: The winding belt is made of a long strip of high-strength composite material net, and is evenly wound around the outermost filter net (4) to form a spiral winding structure.