Composite sand filter pipe

Abstract

The invention discloses a composite sand filtering pipe, belongs to the technical field of sand filtering pipes, and aims to solve the problems that filtering holes of a filtering layer are easy to block and the filtering effect of the filtering layer is influenced. The composite sand filtering pipe comprises a main pipe, a plurality of first filtering holes distributed circumferentially are formed in the top of the outer side wall of the main pipe, and the periphery of the main pipe is sleeved with an elastic round barrel; a plurality of second filtering holes which are circumferentially distributed are formed in the outer side wall of the elastic round barrel, a plurality of wave-shaped strips which are circumferentially distributed are fixed to the inner side wall of the elastic round barrel, and the wave-shaped strips and the second filtering holes are distributed in a staggered mode; according to the device, the elastic round barrel can periodically expand and recover to form a vibration-like effect, so that large-particle gravels and medium-particle gravels on the periphery of the second filtering holes cannot be attached to the periphery of the second filtering holes, and the second filtering holes are prevented from being blocked; meanwhile, due to the formed vibration effect, medium-particle gravels clamped in the second filtering holes can be vibrated out of the second filtering holes, and the situation that the second filtering holes are blocked by the medium-particle gravels, and the filtering effect on the gravels is affected is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of sand control pipes, and particularly relates to a composite sand control pipe. Background Art

[0002] When the existing sand control pipe is in use, the sand and gravel are filtered through the filter layer on the outer periphery of the main pipe. However, after long-term use, the filter holes of the filter layer are easily blocked, affecting the filtering effect of the filter layer.

[0003] Therefore, a composite sand control pipe is needed to solve the problem that the filter holes of the filter layer in the prior art are easily blocked, affecting the filtering effect of the filter layer. Summary of the Invention

[0004] The purpose of the invention is to provide a composite sand control pipe to solve the problems put forward in the above background art.

[0005] To achieve the above purpose, the invention provides the following technical solution: A composite sand control pipe includes a main pipe. A plurality of first filter holes distributed in a circumferential manner are formed at the top of the outer side wall of the main pipe. An elastic cylinder is sleeved outside the main pipe. A plurality of second filter holes distributed in a circumferential manner are formed on the outer side wall of the elastic cylinder. A plurality of corrugated strips distributed in a circumferential manner are fixed on the inner side wall of the elastic cylinder. The corrugated strips are misaligned with the second filter holes. A plurality of uniformly distributed rotating rings are arranged inside the elastic cylinder. A plurality of contact plates distributed in a circumferential manner and matched with the corrugated strips are fixed on the outer side wall of the rotating ring. A plurality of connecting columns distributed in a circumferential manner are fixed between the plurality of rotating rings.

[0006] Further, a second fixing ring is fixed on the top surface of the elastic cylinder. A first fixing ring is fixed on the top of the outer side wall of the main pipe. Engaging grooves are respectively formed on the adjacent surfaces of the first fixing ring and the second fixing ring. An engaging ring gear is movably engaged between the two engaging grooves. An installation plate is fixed on the bottom surface of the first fixing ring. A motor is fixed on one side surface of the installation plate. A gear is fixed on the output end of the motor. The gear is engaged with the engaging ring gear. The top surface of the connecting column is fixed to the bottom surface of the engaging ring gear.

[0007] Further, a second spoiler is fixed on the top surface of the engaging ring gear.

[0008] Further, a plurality of connecting rods distributed in a circumferential manner are fixed on the bottom surface of the bottom rotating ring. A first spoiler is fixed on one side surface of the connecting rod.

[0009] Further, a connecting ring is fixed at a position close to the middle of the outer side wall of the main pipe. The bottom surface of the elastic cylinder is fixed to the inclined surface of the connecting ring.

[0010] Further, a plurality of openings distributed in a circumferential manner are formed at the bottom of the outer side wall of the elastic cylinder.

[0011] Further, one end of the contact plate close to the elastic cylinder is provided with a chamfered corner.

[0012] Further, a plurality of top holes distributed in a circumferential manner are formed in the top surface of the first fixing ring. A contact strip is movably connected in the top holes. A vertical rod is fixed to the bottom surface of the contact strip. A plurality of third spoiler plates distributed in a circumferential manner are fixed to one side surface of the vertical rod. The third spoiler plates correspond to a plurality of the first filtering holes in the vertical direction one by one. Side strips are respectively fixed to the bottom parts of the opposite side surfaces of the outer side wall of the contact strip. Springs are fixed to the top surfaces of the side strips. The top surfaces of the springs are fixed to the bottom surface of the first fixing ring. A plurality of pushing strips distributed in a circumferential manner are fixed to the top surface of the engaging ring teeth.

[0013] Compared with the prior art, a composite sand filtering pipe provided by the present invention has at least the following beneficial effects: (1) By arranging the motor, the gear and the engaging ring teeth, the connecting column can rotate, and then drive the rotating ring to rotate. By arranging the rotating ring, the contact plate and the corrugated strip, the elastic cylinder can be periodically expanded and restored, forming a similar vibrating effect, so that large-particle gravel and medium-particle gravel outside the second filtering holes cannot adhere to the periphery of the second filtering holes, avoiding the blockage of the second filtering holes. At the same time, the formed vibrating effect can also vibrate the medium-particle gravel stuck in the second filtering holes out of the second filtering holes, avoiding the medium-particle gravel from blocking the second filtering holes and affecting the filtering effect of the gravel.

[0014] (2) By arranging a plurality of first spoiler plates and one second spoiler plate, the fluid velocity at the opening position is large, and the fluid velocity at the position of the second spoiler plate is small, so that the fluid at the opening position can impact the fluid at the position of the second spoiler plate. As a result, the fluid at the position of the second spoiler plate will not enter the main pipe and the inner bottom of the elastic cylinder through the opening, avoiding large-particle and medium-particle gravel in the fluid outside the elastic cylinder from entering between the main pipe and the elastic cylinder without being filtered, and preventing the large-particle and medium-particle gravel from impacting the first filtering holes and affecting the fine filtering structure of the first filtering holes.

[0015] (3) By arranging the pushing strips, when the engaging ring teeth rotate, they can drive the pushing strips to rotate, and then push the contact strip to move downward, so that the third spoiler plates can move downward, driving the fluid and small-particle gravel around the first filtering holes, and avoiding the situation that the first filtering holes are blocked when a large amount of small-particle gravel is concentrated and blocked by the first filtering holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic side view structure diagram of the present invention; Figure 3Schematic diagram of the top structure of the present invention; Figure 4 Schematic diagram of the snap ring gear structure of the present invention; Figure 5 Schematic diagram of the cross-sectional structure of the first fixing ring of the present invention; Figure 6 Schematic diagram of a partial structure of the present invention; Figure 7 is Figure 6 The enlarged structure diagram of part A in Figure 8 Schematic diagram of the structure at the rotating ring of the present invention; Figure 9 is Figure 8 The enlarged structure diagram of part B in Figure 10 Schematic diagram of the third spoiler structure of the present invention; Figure 11 Schematic diagram of the structure at the contact strip of the present invention.

[0017] In the figure: 100, main pipe; 101, first filter hole; 102, elastic cylinder; 103, second filter hole; 104, opening; 105, connecting ring; 200, first fixing ring; 201, second fixing ring; 202, engaging groove; 203, engaging ring gear; 204, gear; 205, mounting plate; 206, motor; 300, corrugated strip; 301, rotating ring; 302, contact plate; 303, connecting column; 400, connecting rod; 401, first spoiler; 500, second spoiler; 600, top hole; 601, contact strip; 602, pushing strip; 603, side strip; 604, spring; 605, vertical rod; 606, third spoiler. Detailed implementation manners

[0018] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. It should be noted that, without conflict, the implementation manners and features in the present disclosure can be combined, separated, interchanged and / or rearranged. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0019] In the drawings, for clarity and / or descriptive purposes, the dimensions and relative dimensions of components may be exaggerated. When exemplary embodiments may be implemented differently, the specific process orders may be performed in an order different from that described. For example, two consecutively described processes may be performed substantially simultaneously or in an order opposite to the described order. In addition, the same reference numerals denote the same components.

[0020] The terms used herein are for the purpose of describing particular embodiments and are not intended to be limiting. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are also intended to include the plural forms. In addition, when the terms "comprise" and / or "include" and their variants are used in this specification, it is stated that there are the stated features, integers, steps, operations, components, assemblies and / or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, assemblies and / or groups thereof. It should also be noted that, as used herein, the terms "substantially", "about" and other similar terms are used as approximate terms and not as terms of degree, and thus they are used to explain the inherent deviations of measured values, calculated values and / or provided values that would be recognized by those of ordinary skill in the art.

[0021] Please refer to Figures 1-11 , the present invention provides a composite sand control pipe, including a main pipe 100. A plurality of first filter holes 101 distributed in a circumferential manner are formed at the top of the outer side wall of the main pipe 100. An elastic cylinder 102 is sleeved outside the main pipe 100. A plurality of second filter holes 103 distributed in a circumferential manner are formed on the outer side wall of the elastic cylinder 102. A plurality of corrugated strips 300 distributed in a circumferential manner are fixed to the inner side wall of the elastic cylinder 102. The corrugated strips 300 are distributed in a staggered manner with respect to the second filter holes 103. A plurality of rotation rings 301 evenly distributed are arranged inside the elastic cylinder 102. A plurality of contact plates 302 distributed in a circumferential manner and cooperating with the corrugated strips 300 are fixed to the outer side wall of the rotation rings 301. A plurality of connecting columns 303 distributed in a circumferential manner are fixed between the plurality of rotation rings 301.

[0022] This solution has the following working process: First, through the threads at both ends of the main pipe 100, the two ends of the main pipe 100 are screwed and fixed to the corresponding equipment interfaces, so that the position of the main pipe 100 is fixed. Then, the interfaces of the corresponding equipment and the main pipe 100 are placed in the well pipe. Subsequently, the motor 206 is started. The rotation of the motor 206 drives the gear 204 to rotate. The rotation of the gear 204 drives the engagement ring teeth 203 to rotate. The rotation of the engagement ring teeth 203 drives a number of connecting columns 303 to rotate. The rotation of the connecting columns 303 drives a number of rotating rings 301 to rotate. The rotation of the rotating rings 301 drives the contact plate 302 to rotate. The contact plate 302 rotates and contacts the corrugated strip 300, pushing the corrugated strip 300 to expand outwards. The outward expansion of the corrugated strip 300 drives the elastic cylinder 102 to expand outwards. Then, the contact plate 302 rotates to the position of the second filter hole 103. The contact plate 302 continues to rotate, and so on, so that the elastic cylinder 102 expands and recovers periodically. Since the elastic cylinder 102 expands and recovers periodically to form a similar vibration effect, large-grained gravel and medium-grained gravel outside the second filter hole 103 cannot adhere to the outside of the second filter hole 103, avoiding the blockage of the second filter hole 103. At the same time, the formed vibration effect can also vibrate out the medium-grained gravel stuck in the second filter hole 103 from the second filter hole 103, avoiding the blockage of the second filter hole 103 by the medium-grained gravel. The fluid outside the elastic cylinder 102 enters between the elastic cylinder 102 and the main pipe 100 through the second filter hole 103. The second filter hole 103 filters large-grained and medium-grained gravel outside the elastic cylinder 102. Small-grained gravel follows the fluid and moves between the elastic cylinder 102 and the main pipe 100. Some small-grained gravel directly falls onto the connecting ring 105. The fluid passes through the first filter hole 101, and the small-grained gravel is blocked outside the main pipe 100 by the first filter hole 101. This part of the small-grained gravel falls onto the connecting ring 105. The fluid passes through the second filter hole 103 and the first filter hole 101 to filter out large-grained, medium-grained and small-grained gravel in the fluid. The filtered fluid passes through the first filter hole 101 and enters the main pipe 100, and then enters the corresponding position.When the rotating ring 301 rotates, it drives the connecting rod 400 to rotate. The rotation of the connecting rod 400 drives the first spoiler 401 to rotate. The rotation of several first spoilers 401 evenly stirs the fluid at the bottom between the main pipe 100 and the elastic barrel 102, and pushes the fluid at this position outward. The fluid is discharged outside the elastic barrel 102 through the opening 104. At the same time, it can also discharge the small-particle gravel falling on the connecting ring 105 outside the elastic barrel 102. When the fluid is discharged outward at this position, due to the relatively fast flow rate, the fluid outside the elastic barrel 102 will not enter the main pipe 100 and the inner bottom of the elastic barrel 102 through the opening 104, thereby avoiding large-particle and medium-particle gravel in the fluid outside the elastic barrel 102 from entering between the main pipe 100 and the elastic barrel 102 without being filtered, causing the large-particle and medium-particle gravel to impact the first filter hole 101 and affecting the fine filtration structure of the first filter hole 101. At the same time, the engaging ring teeth 203 rotate to drive the second spoiler 500 to rotate. The rotation of the second spoiler 500 stirs the fluid and gravel around the elastic barrel 102, enhancing the flow rate of the fluid, thereby improving the filtering effect of the second filter hole 103 on large-particle and medium-particle gravel. At the same time, the fluid passing through the second filter hole 103 has a flow rate, and then the small-particle gravel is filtered through the first filter hole 101. When the fluid passes through the first filter hole 101, it will impact the outer wall of the main pipe 100. With this setting, it can avoid small-particle gravel from gathering around the first filter hole 101 and causing the first filter hole 101 to be blocked, and effectively impact the small-particle gravel attached to the periphery of the first filter hole 101. Since only one second spoiler 500 is provided, and there are several first spoilers 401, the fluid flow rate at the position of the opening 104 is large, and the fluid flow rate at the position of the second spoiler 500 is small, so that the fluid at the position of the opening 104 will impact the fluid at the position of the second spoiler 500, and the fluid at the position of the second spoiler 500 will not enter the main pipe 100 and the inner bottom of the elastic barrel 102 through the opening 104.

[0023] When the engaging ring teeth 203 rotate, it will drive the push bar 602 to rotate. The push bar 602 is in contact and cooperation with the contact bar 601, causing the contact bar 601 to move downward. At this time, the spring 604 is stretched. The downward movement of the contact bar 601 drives the vertical rod 605 to move downward. The downward movement of the vertical rod 605 drives the third spoiler 606 to move downward. The downward movement of the third spoiler 606 drives the fluid around the first filter hole 101, stirring the small-particle gravel carried in the fluid, so that the small-particle gravel in the fluid can be dispersed and will not be concentrated around the first filter hole 101. When the push bar 602 passes through the contact bar 601, the spring 604 pulls the contact bar 601 upward to continue stirring the fluid around the first filter hole 101. Repeating this way, the fluid around the first filter hole 101 is continuously stirred, continuously dispersing the small-particle gravel in the fluid and avoiding the concentrated small-particle gravel from blocking the first filter hole 101.

[0024] According to the above working process, it can be known that: by setting the motor 206, the gear 204, and the engaging ring teeth 203, the connecting column 303 can rotate, thereby driving the rotating ring 301 to rotate. By setting the rotating ring 301, the contact plate 302, and the corrugated strip 300, the elastic cylinder 102 can be periodically expanded and restored, forming a vibration-like effect, so that large-grained and medium-grained gravel outside the second filter hole 103 cannot adhere to the periphery of the second filter hole 103, avoiding the blockage of the second filter hole 103. At the same time, the vibration effect formed can also vibrate the medium-grained gravel stuck in the second filter hole 103 out of the second filter hole 103, avoiding the medium-grained gravel from blocking the second filter hole 103 and affecting the filtering effect of the gravel.

[0025] By setting a number of first spoiler plates 401 and a second spoiler plate 500, the fluid velocity at the position of the opening 104 is large, and the fluid velocity at the position of the second spoiler plate 500 is small, so that the fluid at the position of the opening 104 will impact the fluid at the position of the second spoiler plate 500. As a result, the fluid at the position of the second spoiler plate 500 will not enter the main pipe 100 and the inner bottom of the elastic cylinder 102 through the opening 104, avoiding large-grained and medium-grained gravel in the fluid outside the elastic cylinder 102 from entering between the main pipe 100 and the elastic cylinder 102 without being filtered, causing the large-grained and medium-grained gravel to impact the first filter hole 101 and affecting the fine filtering structure of the first filter hole 101.

[0026] In one embodiment, a second fixing ring 201 is fixed on the top surface of the elastic cylinder 102, a first fixing ring 200 is fixed on the top of the outer side wall of the main pipe 100, engaging grooves 202 are respectively formed on the adjacent surfaces of the first fixing ring 200 and the second fixing ring 201, an engaging ring teeth 203 is movably engaged between the two engaging grooves 202, a mounting plate 205 is fixed on the bottom surface of the first fixing ring 200, a motor 206 is fixed on one side surface of the mounting plate 205, a gear 204 is fixed on the output end of the motor 206, the gear 204 meshes with the engaging ring teeth 203, and the top surface of the connecting column 303 is fixed to the bottom surface of the engaging ring teeth 203.

[0027] By setting the second fixing ring 201, the first fixing ring 200, the engaging groove 202, and the engaging ring teeth 203, the second fixing ring 201 can be connected to the first fixing ring 200, facilitating the limitation of the top of the elastic cylinder 102. This setting makes it convenient for the engaging ring teeth 203 to rotate.

[0028] In one embodiment, a second spoiler plate 500 is fixed on the top surface of the engaging ring teeth 203.

[0029] By means of the provided second spoiler 500, when the engaging ring teeth 203 rotate, they can drive the second spoiler 500 to rotate, thereby agitating the fluid around the elastic barrel 102 and avoiding the situation of sand and gravel caking in the fluid.

[0030] In one embodiment, a plurality of connecting rods 400 distributed in a circular pattern are fixed to the bottom surface of the rotating ring 301 at the bottom, and a first spoiler 401 is fixed to one side surface of the connecting rod 400.

[0031] By means of the provided first spoiler 401, the fluid at the inner bottom of the elastic barrel 102 can be agitated to form a turbulent flow, driving the sand and gravel on the inclined surface of the connecting ring 105 and discharging them from the opening 104 to the outside. At the same time, the turbulent flow can block the fluid around the elastic barrel 102, preventing the fluid around the elastic barrel 102 and the sand and gravel in the fluid from entering the elastic barrel 102 through the opening 104, which may cause the sand and gravel in this part of the fluid not to be screened through the first filter hole 101 and block the first filter hole 101.

[0032] In one embodiment, a connecting ring 105 is fixed to the outer side wall of the main pipe 100 near the middle position, and the bottom surface of the elastic barrel 102 is fixed to the inclined surface of the connecting ring 105.

[0033] By means of the provided connecting ring 105, the bottom surface of the elastic barrel 102 is fixed to the outer wall of the main pipe 100 through the connecting ring 105. At the same time, the surface of the connecting ring 105 is inclined, ensuring that the small sand and gravel filtered through the second filter hole 103 can fall onto the inclined surface of the connecting ring 105 and then be driven by the turbulent flow generated by the first spoiler 401 to be discharged from the opening 104 to the outside of the elastic barrel 102.

[0034] In one embodiment, a plurality of openings 104 distributed in a circular pattern are formed at the bottom of the outer side wall of the elastic barrel 102.

[0035] By means of the provided openings 104, the sand and gravel on the connecting ring 105 can be discharged from the openings 104 under the action of the first spoiler 401, avoiding the situation of sand and gravel accumulating at the inner bottom of the elastic barrel 102.

[0036] In one embodiment, one end of the contact plate 302 close to the elastic barrel 102 is provided with a chamfer.

[0037] By means of the chamfer at one end of the provided contact plate 302, the contact between the contact plate 302 and the corrugated strip 300 is smoother, reducing the friction with the corrugated strip 300.

[0038] In one embodiment, a plurality of top holes 600 distributed in a circular pattern are formed in the top surface of the first fixing ring 200. A contact strip 601 is movably connected in the top holes 600. A vertical rod 605 is fixed to the bottom surface of the contact strip 601. A plurality of third spoiler plates 606 distributed in a circular pattern are fixed to one side surface of the vertical rod 605. The third spoiler plates 606 correspond to a plurality of the first filter holes 101 in the vertical direction one by one. Side strips 603 are respectively fixed to the bottom parts of the opposite two side surfaces of the outer side wall of the contact strip 601. Springs 604 are fixed to the top surfaces of the side strips 603. The top surfaces of the springs 604 are fixed to the bottom surface of the first fixing ring 200. A plurality of pushing strips 602 distributed in a circular pattern are fixed to the top surface of the engaging ring teeth 203.

[0039] By providing the pushing strips 602, when the engaging ring teeth 203 rotate, the pushing strips 602 can be driven to rotate, thereby pushing the contact strip 601 to move downward, so that the third spoiler plates 606 can move downward, driving the fluid and small granular gravel around the first filter holes 101, and avoiding the situation that the first filter holes 101 are blocked when a large amount of small granular gravel is concentrated and blocked by the first filter holes 101.

[0040] In summary: First, through the threads at both ends of the main pipe 100, the two ends of the main pipe 100 are screwed and fixed to the corresponding equipment interfaces, so that the position of the main pipe 100 is fixed. Then, the interfaces of the corresponding equipment and the main pipe 100 are placed in the well pipe. Subsequently, the motor 206 is started. The rotation of the motor 206 drives the rotation of the gear 204. The rotation of the gear 204 drives the rotation of the engaging ring gear 203. The rotation of the engaging ring gear 203 drives the rotation of a number of connecting columns 303. The rotation of the connecting columns 303 drives the rotation of a number of rotating rings 301. The rotation of the rotating rings 301 drives the rotation of the contact plate 302. The contact plate 302 rotates and contacts the corrugated strip 300, pushing the corrugated strip 300 to expand outwards. The outward expansion of the corrugated strip 300 drives the outward expansion of the elastic barrel 102. Then, the contact plate 302 rotates to the position of the second filter hole 103, and the contact plate 302 continues to rotate, and so on, so that the elastic barrel 102 expands and recovers periodically. Since the elastic barrel 102 expands and recovers periodically to form a similar vibration effect, large-grained gravel and medium-grained gravel outside the second filter hole 103 cannot adhere to the outside of the second filter hole 103, avoiding the blockage of the second filter hole 103. At the same time, the formed vibration effect can also vibrate the medium-grained gravel stuck in the second filter hole 103 out of the second filter hole 103, avoiding the blockage of the second filter hole 103 by the medium-grained gravel. The fluid outside the elastic barrel 102 enters between the elastic barrel 102 and the main pipe 100 through the second filter hole 103. The second filter hole 103 filters the large-grained and medium-grained gravel outside the elastic barrel 102, while the small-grained gravel moves with the fluid to between the elastic barrel 102 and the main pipe 100. Some of the small-grained gravel directly falls onto the connecting ring 105. The fluid passes through the first filter hole 101, and the small-grained gravel is blocked outside the main pipe 100 by the first filter hole 101. This part of the small-grained gravel falls onto the connecting ring 105. The fluid passes through the second filter hole 103 and the first filter hole 101 to filter out the large-grained, medium-grained and small-grained gravel in the fluid. The filtered fluid enters the main pipe 100 through the first filter hole 101 and then enters the corresponding position.When the rotating ring 301 rotates, it drives the connecting rod 400 to rotate. The rotation of the connecting rod 400 drives the rotation of the first spoiler 401. The rotation of several first spoilers 401 evenly stirs the fluid at the bottom between the main pipe 100 and the elastic barrel 102, and pushes the fluid at this position outward. The fluid is discharged out of the elastic barrel 102 through the opening 104. At the same time, it can also discharge the small-particle gravel falling on the connecting ring 105 to the outside of the elastic barrel 102. When the fluid is discharged outward at this position, due to the relatively fast flow rate, the fluid outside the elastic barrel 102 will not enter the main pipe 100 and the inner bottom of the elastic barrel 102 through the opening 104, thereby avoiding large-particle and medium-particle gravel in the fluid outside the elastic barrel 102 from entering between the main pipe 100 and the elastic barrel 102 without filtration, causing the large-particle and medium-particle gravel to impact the first filter hole 101 and affecting the fine filtration structure of the first filter hole 101. At the same time, the engaging ring teeth 203 rotate to drive the second spoiler 500 to rotate. The rotation of the second spoiler 500 stirs the fluid and gravel around the elastic barrel 102, enhancing the flow rate of the fluid, thereby improving the filtering effect of the second filter hole 103 on large-particle and medium-particle gravel. At the same time, the fluid passing through the second filter hole 103 has a flow rate, and then the small-particle gravel is filtered through the first filter hole 101. When the fluid passes through the first filter hole 101, it will impact the outer wall of the main pipe 100. With this setting, it can avoid small-particle gravel from aggregating around the first filter hole 101, causing the first filter hole 101 to be blocked, and effectively impact the small-particle gravel attached to the periphery of the first filter hole 101. Since only one second spoiler 500 is provided, while there are several first spoilers 401, the fluid flow rate at the position of the opening 104 is large, and the fluid flow rate at the position of the second spoiler 500 is small, so that the fluid at the position of the opening 104 will impact the fluid at the position of the second spoiler 500, making the fluid at the position of the second spoiler 500 not enter the main pipe 100 and the inner bottom of the elastic barrel 102 through the opening 104.

[0041] When the engaging ring teeth 203 rotate, it will drive the push bar 602 to rotate. The push bar 602 is in contact and cooperation with the contact bar 601, causing the contact bar 601 to move downward. At this time, the spring 604 is stretched. The downward movement of the contact bar 601 drives the vertical rod 605 to move downward. The downward movement of the vertical rod 605 drives the third spoiler 606 to move downward. The downward movement of the third spoiler 606 drives the fluid around the first filter hole 101, stirring the small-particle gravel carried in the fluid, so that the small-particle gravel in the fluid can be dispersed and will not be concentrated around the first filter hole 101. When the push bar 602 passes through the contact bar 601, the spring 604 pulls the contact bar 601 upward to continue stirring the fluid around the first filter hole 101. Repeating this way, the fluid around the first filter hole 101 is continuously stirred, continuously dispersing the small-particle gravel in the fluid and avoiding the concentrated small-particle gravel from blocking the first filter hole 101.

[0042] When the contact plate 302 is not rotated, the chamfer of the contact plate 302 contacts the inner wall of the elastic cylinder 102.

[0043] Among them, the aperture of the second filter hole 103 is smaller than the diameters of large and medium-sized granular sands and gravels, so that when the elastic cylinder 102 expands, the second filter hole 103 can still block large granular sands and gravels and some medium-sized granular sands and gravels, and the aperture of the first filter hole 101 is much smaller than the diameter of small granular sands and gravels.

[0044] The material of the elastic cylinder 102 is stainless steel.

[0045] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite sand control pipe, comprising a main pipe (100), characterized in that, On the top of the outer wall of the main pipe (100), a number of first filter holes (101) are arranged in a circumferential distribution. An elastic cylinder (102) is sleeved outside the main pipe (100). On the outer wall of the elastic cylinder (102), a number of second filter holes (103) are arranged in a circumferential distribution. On the inner wall of the elastic cylinder (102), a number of corrugated strips (300) are fixed in a circumferential distribution. The corrugated strips (300) are arranged in a staggered manner with the second filter holes (103). A number of uniformly distributed rotating rings (301) are arranged inside the elastic cylinder (102). On the outer wall of the rotating ring (301), a number of contact plates (302) are fixed in a circumferential distribution and are matched with the corrugated strips (300). A number of connecting columns (303) are fixed in a circumferential distribution between the rotating rings (301).

2. The composite sand control pipe according to claim 1, characterized in that: On the top surface of the elastic cylinder (102), a second fixing ring (201) is fixed. On the top of the outer wall of the main pipe (100), a first fixing ring (200) is fixed. Engaging grooves (202) are respectively arranged on the adjacent surfaces of the first fixing ring (200) and the second fixing ring (201). An engaging ring gear (203) is movably engaged between the two engaging grooves (202). On the bottom surface of the first fixing ring (200), a mounting plate (205) is fixed. On one side surface of the mounting plate (205), a motor (206) is fixed. On the output end of the motor (206), a gear (204) is fixed. The gear (204) is engaged with the engaging ring gear (203). The top surface of the connecting column (303) is fixed to the bottom surface of the engaging ring gear (203).

3. The composite sand control pipe according to claim 2, characterized in that: On the top surface of the engaging ring gear (203), a second spoiler (500) is fixed.

4. A composite sand control pipe according to claim 1, characterized in that: On the bottom surface of the bottom rotating ring (301), a number of connecting rods (400) are fixed in a circumferential distribution. On one side surface of the connecting rod (400), a first spoiler (401) is fixed.

5. A composite sand control pipe according to claim 1, characterized in that: A connecting ring (105) is fixed at a position close to the middle of the outer wall of the main pipe (100). The bottom surface of the elastic cylinder (102) is fixed to the inclined surface of the connecting ring (105).

6. The composite sand control pipe according to claim 1, wherein: On the bottom of the outer wall of the elastic cylinder (102), a number of openings (104) are arranged in a circumferential distribution.

7. A composite sand control pipe according to claim 1, characterized in that: One end of the contact plate (302) close to the elastic cylinder (102) is provided with a chamfered corner.

8. The composite sand control pipe according to claim 2, characterized in that: On the top surface of the first fixing ring (200), a number of top holes (600) are arranged in a circumferential distribution. A contact strip (601) is movably connected in the top hole (600). On the bottom surface of the contact strip (601), a vertical rod (605) is fixed. On one side surface of the vertical rod (605), a number of third spoilers (606) are fixed in a circumferential distribution. The third spoilers (606) correspond to the first filter holes (101) vertically one by one. On the opposite side surfaces at the bottom of the outer wall of the contact strip (601), side strips (603) are respectively fixed. On the top surface of the side strip (603), a spring (604) is fixed. The top surface of the spring (604) is fixed to the bottom surface of the first fixing ring (200). On the top surface of the engaging ring gear (203), a number of pushing strips (602) are fixed in a circumferential distribution.

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