Blockage removal sand control screen pipe

Abstract

The utility model discloses an unblocking sand control screen pipe which comprises a sand control screen pipe body, a push rod and a sector plate piston valve, and filter holes are densely distributed in the sand control screen pipe body. The push rod penetrates through the sand control screen pipe; the sector plate piston valve comprises a fixed plate and a rotating plate, the fixed plate fixedly sleeves the push rod, the rotating plate is movably arranged at the bottom of the fixed plate, the sector plate piston valve is in an open state when the rotating plate rotates to completely coincide with the fixed plate, and the sector plate piston valve is in a closed state when the rotating plate rotates to be spliced with the fixed plate to form a complete circle to form a closed piston. The fan-shaped plate piston valve is in a closed state; once the normal oil production working condition is gradually converted into the abnormal blocking working condition, under the condition that the oil production equipment does not need to be shut down, the push rod only needs to push the closed piston formed by the fan-shaped plate piston valve to continue to move downwards to compress liquid in the sand control screen pipe, and the liquid reversely flows in the sand control screen pipe; sand and stones blocked on the filter holes of the sand control screen pipe are flushed and discharged, so that blockage removal can be realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of oil exploitation, and specifically relates to a plugging-removing sand screen pipe. BACKGROUND

[0002] Energy is the food of industry and the lifeline of the national economy. However, in the process of oil and gas exploitation, sand production is a common and serious problem, especially in loose sandstone formations. Sand production not only affects the production efficiency of oil and gas wells, but also can cause wellbore damage, equipment failure, production reduction and shutdown, and even major safety accidents such as well kick and blowout, resulting in huge economic losses. In summary, sand production oilfields have a wide distribution range, large geological differences, and prominent individuality, lacking universal characteristics, which seriously restricts the efficient exploration and development of China's oil and gas. Mechanical screen pipe sand control method can effectively prevent sand production. However, mechanical screen pipe sand control is prone to filter medium blockage, resulting in a significant reduction in oil well productivity. The occurrence of blockage not only shortens the production life of oil wells and reduces production, but also has a negative impact on the economic benefits of oil wells.

[0003] Currently, to deal with the blockage, a high-pressure jet device needs to be connected from the ground to the blocked position through a pipeline, and a high-pressure jetting plugging-removing fluid is used to reverse flush from the inside of the sand control screen pipe to remove the sand and stones blocked on the filter holes of the sand control screen pipe. However, this plugging-removing method often requires the oil extraction equipment to be shut down, which seriously affects the production efficiency and causes double waste of time and resources. Therefore, there is a lack of a device that can achieve plugging removal without shutting down the oil extraction equipment. SUMMARY

[0004] To solve the above problems, the utility model provides a plugging-removing sand screen pipe to solve the problem that there is a lack of a device that can achieve plugging removal without shutting down the oil extraction equipment.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0006] The utility model discloses a plugging-removing sand screen pipe, which comprises:

[0007] A sand control screen pipe is provided with filter holes;

[0008] A push rod is arranged in the sand control screen pipe;

[0009] A fan-shaped plate piston valve comprises a fixed plate and a rotating plate. The fixed plate is fixedly sleeved on the push rod, and the rotating plate is movably arranged at the bottom of the fixed plate. When the rotating plate is rotated to completely coincide with the fixed plate, the fan-shaped plate piston valve is in an open state. When the rotating plate is rotated to splice the fixed plate into a complete circle to form a closed piston, the fan-shaped plate piston valve is in a closed state.

[0010] During the process of the sector plate piston valve moving upward to the highest design point, the rotating plate continues to rotate at the bottom of the fixed plate until it is completely coincided with the fixed plate, the sector plate piston valve achieves complete opening, and the fluid is continuously output upward from the sand screen, which is recorded as normal production condition; if the filter holes of the sand screen are gradually blocked by sand, the fluid pressure inside the sand screen is reduced, which is recorded as abnormal plugging condition;

[0011] Once the normal production condition gradually changes into the abnormal plugging condition, the closed piston formed by the sector plate piston valve pushed by the push rod continues to move downward to compress the liquid inside the sand screen, the liquid flows reversely inside the sand screen to flush and discharge the sand blocked in the filter holes of the sand screen, so that the plugging is solved without stopping the production of the oil production equipment.

[0012] Preferably, an annular limiting flange is arranged at the top of the inner wall of the sand screen for limiting the upward movement of the sector plate piston valve; the position of the limiting flange is the highest design point that the sector plate piston valve can reach.

[0013] Preferably, the limiting flange comprises a plurality of limiting flange segments, and the limiting flange segments are located on the same circle of the limiting flange.

[0014] Preferably, a stabilizing frame is arranged at the bottom of the inside of the sand screen, a center hole is arranged on the stabilizing frame, the center hole is located on the longitudinal center line of the sand screen, and the bottom end of the push rod is arranged on the center hole of the stabilizing frame.

[0015] Preferably, the fixed plate comprises an upper center cylinder and a plurality of upper sector plates, the upper center cylinder comprises an inner cylinder and an outer cylinder, the top of the inner cylinder and the outer cylinder are fixedly connected and integrally formed, the inner cylinder of the upper center cylinder is sleeved on the outer wall of the push rod, and the plurality of upper sector plates are annularly and uniformly arranged on the outer cylinder of the upper center cylinder around the upper center cylinder.

[0016] The rotating plate comprises a lower center cylinder and a plurality of lower sector plates, and the plurality of lower sector plates are annularly and uniformly arranged around the lower center cylinder.

[0017] The outer wall of the bottom of the inner cylinder of the upper center cylinder and the inner wall of the bottom of the outer cylinder form an annular groove, the top of the lower center cylinder is protruded upward to form an annular flange, and the annular flange of the lower center cylinder is movably inserted into the annular groove of the upper center cylinder.

[0018] Preferably, the shape and number of the lower fan-shaped plates are the same as those of the upper fan-shaped plates respectively, and the area of the lower fan-shaped plate is larger than that of the upper fan-shaped plate, so as to ensure that each lower fan-shaped plate can be blocked by the corresponding limiting flange section and cover the corresponding upper fan-shaped plate when the lower fan-shaped plates and the upper fan-shaped plates are overlapped respectively.

[0019] Preferably, the two sides of the cylinder wall of the inner cylinder of the upper center cylinder of the fixed plate are respectively provided with an arc-shaped limiting groove, and the inner wall of the annular flange of the lower center cylinder of the rotating plate is respectively provided with an elastic pin, when the annular flange of the lower center cylinder of the rotating plate is movably inserted into the annular groove of the upper center cylinder of the fixed plate, the two elastic pins of the lower center cylinder of the rotating plate are simultaneously inserted into the two arc-shaped limiting grooves of the upper center cylinder of the fixed plate respectively.

[0020] Preferably, each arc-shaped limiting groove is provided with a highest point near the top end of the inner cylinder and a lowest point near the bottom end of the inner cylinder, and the connecting line between the highest point and the lowest point is in a circular arc shape; the two elastic pins respectively make spiral motion along the respective arc-shaped limiting grooves, and when the elastic pins move in the arc-shaped limiting grooves, the lower center cylinder of the rotating plate rotates, and each lower fan-shaped plate moves close to or away from the corresponding upper fan-shaped plate in the vertical direction.

[0021] Preferably, the annular groove of the upper center cylinder is provided with a reset spring, when the annular flange of the lower center cylinder of the rotating plate is movably inserted into the annular groove of the upper center cylinder of the fixed plate, one end of the reset spring abuts against the top surface wall of the annular groove of the upper center cylinder of the fixed plate, and the other end abuts against the top surface wall of the annular flange of the lower center cylinder of the rotating plate.

[0022] Compared with the prior art, the utility model has the advantages of:

[0023] The utility model discloses a kind of unblocking sand control screen pipes, including: a sand control screen pipe, which is densely covered with filter holes;A push rod is arranged in the sand control screen pipe;A fan-shaped plate piston valve includes a fixed plate and a rotating plate, the fixed plate is fixedly sleeved on the push rod, and the rotating plate is movably arranged at the bottom of the fixed plate;When the rotating plate rotates to completely coincide with the fixed plate, the fan-shaped plate piston valve is in an open state;When the rotating plate rotates to form a closed piston by splicing with the fixed plate to form a complete circle, the fan-shaped plate piston valve is in a closed state;During the upward movement of the fan-shaped plate piston valve to the highest design point, the rotating plate continues to rotate at the bottom of the fixed plate until it completely coincides with the fixed plate, and the fan-shaped plate piston valve is fully opened;Fluid is continuously output upward from the sand control screen pipe at this time, and this state is referred to as normal oil production condition;If the filter holes of the sand control screen pipe are gradually blocked by sand, the fluid pressure inside the sand control screen pipe decreases, and this state is referred to as blocked abnormal condition;Once the normal oil production condition gradually changes to the blocked abnormal condition, the push rod only needs to push the closed piston formed by the fan-shaped plate piston valve to continue to move downward, compress the liquid inside the sand control screen pipe, and the liquid flows reversely inside the sand control screen pipe to flush and discharge the sand blocked on the filter holes of the sand control screen pipe, thereby realizing unblocking, which not only reduces the working difficulty, but also ensures the production efficiency and reduces the waste of time and resources without stopping production.

[0024] The utility model discloses a kind of unblocking sand control screen pipes, using high-pressure water jet unblocking technical principle, cleverly design push rod and fan-shaped plate piston valve in sand control screen pipe to form reverse hydraulic overflow flushing device, realize the integration of once downhole operation of sand control and unblocking function, can intelligently and efficiently solve the plugging problem of sand control screen pipe under complex downhole working environment, also simultaneously have effective sand control performance and self-unblocking capacity. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the structure schematic view of the unblocking sand control screen pipe when fan-shaped plate piston valve moves to the highest design point provided by the utility model embodiment 1, wherein to see internal structure as far as possible, sand control screen pipe is partially omitted, same below;

[0026] Figure 2 It is the structure schematic view of the fan-shaped plate piston valve in Figure 1 From the highest design point after falling;

[0027] Figure 3 It is the structure schematic view of the sand control screen pipe in Figure 1 ;And

[0028] Figure 4 It is the external structure schematic view of the sand control screen pipe provided by the utility model embodiment 1;

[0029] Figure 5is Figure 4 a top view of the

[0030] Figure 6 is a structure schematic view of the fixed plate fixed on the push rod provided by the utility model embodiment 1;

[0031] Figure 7 is a schematic view of the sector plate piston valve in the highest design point on the push rod in the open state provided by the utility model embodiment 1;

[0032] Figure 8 is Figure 7 the schematic view of the sector plate piston valve in the highest design point on the push rod in the closed state in the

[0033] Figure 9 is a schematic view of the sector plate piston valve in the completely open state provided by the utility model embodiment 1;

[0034] Figure 10 is a schematic view of the sector plate piston valve in the completely closed state provided by the utility model embodiment 1;

[0035] Figure 11 is a three-dimensional view of the fixed plate in the angle of view from below provided by the utility model embodiment 1, from which the arc-shaped limiting slot and the annular groove surrounded by the bottom of the inner cylinder and the bottom of the outer cylinder can be seen;

[0036] Figure 12 is a back view of the fixed plate provided by the utility model embodiment 1, from which the annular groove surrounded by the bottom of the inner cylinder and the bottom of the outer cylinder can be seen;

[0037] Figure 13 is a three-dimensional view of the rotating plate in the angle of view from above provided by the utility model embodiment 1,

[0038] Figure 14 is Figure 1 the longitudinal sectional view of the upper part of the plug-preventing sand screen pipe in the

[0039] Figure 15 is Figure 14 the enlarged view of the part;

[0040] Figure 16 is Figure 15 the sectional view after rotation, showing that the elastic pin and the arc-shaped limiting slot cooperate.

[0041] Explanation of reference signs:

[0042] 1-sand screen pipe, 10-filter hole, 11-limiting flange section, 12-stabilizing frame;

[0043] 2-push rod,

[0044] 3 - sector plate piston valve, 31 - fixed plate, 310 - annular groove, 311 - upper center cylinder, 3111 - inner cylinder, 3112 - outer cylinder, 312 - upper sector plate, 313 - arc-shaped limiting groove; 32 - rotating plate, 320 - annular flange, 321 - lower center cylinder, 322 - lower sector plate, 323 - elastic pin;

[0045] 33 - reset spring. DETAILED DESCRIPTION

[0046] Exemplary embodiments of the present application will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it is understood that the present application can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0047] Example 1: A plugging removal sand control screen pipe

[0048] The plugging removal sand control screen pipe according to an embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0049] Reference Figure 1 and Figure 2 The plugging removal sand control screen pipe comprises:

[0050] A sand control screen pipe 1, which is densely covered with filter holes 10;

[0051] A push rod 2, which is arranged in the sand control screen pipe 1;

[0052] A sector plate piston valve 3, which comprises a fixed plate 31 and a rotating plate 32, the fixed plate 31 is fixedly arranged on the push rod 2, and the rotating plate 32 is movably arranged at the bottom of the fixed plate 31, and when the rotating plate 32 is rotated to completely coincide with the fixed plate 31, the sector plate piston valve 3 is in a completely open state, as shown in Figure 7 and Figure 9 When the rotating plate 32 is rotated to form a complete circle with the fixed plate 31 to form a closed piston, the sector plate piston valve 3 is in a completely closed state, as shown in Figure 8 and Figure 10 ;

[0053] During the upward movement of the sector plate piston valve 3 to the highest design point, the rotating plate 32 continues to rotate at the bottom of the fixed plate 31 until it completely coincides with the fixed plate 31, and the sector plate piston valve 3 is completely opened, as shown in Figure 7 and Figure 9As shown in the figure; fluid is continuously output from the sand control screen 1 upwards, and this state is recorded as normal oil production condition; if the filter holes of the sand control screen 1 are gradually blocked by sand, causing the fluid pressure inside the sand control screen 1 to drop, and this state is recorded as plugging abnormal condition;

[0054] Once the normal oil production condition gradually changes into the plugging abnormal condition, without the need to shut down the oil production equipment, only need to push the push rod 2 to push the closed piston formed by the sector plate piston valve 3 to continue to move downward, compress the liquid inside the sand control screen 1, the liquid flows reversely inside the sand control screen 1, and the sand blocked in the filter holes of the sand control screen 1 is flushed out, so that the plugging is realized.

[0055] Wherein, in the normal oil production condition, the power of the sector plate piston valve 3 moving upward and maintaining at the highest design point is the pressure of the oil mixed liquid flowing upward. As a matter of common knowledge, the top end port of the sand control screen 1 is connected with an oil pump, and the oil pump sucks the oil mixed liquid inside the sand control screen 1 to the wellhead after starting.

[0056] In the normal oil production condition gradually changes into the plugging abnormal condition, the sector plate piston valve 3 will start to move downward at first, and the sector plate piston valve 3 will also gradually close until the self-weight of the sector plate piston valve 3 and the buoyancy in the sand control screen 1 are balanced. But if the sand blocked in the filter holes of the sand control screen 1 is flushed out, the push rod 2 still needs to be pushed to push the sector plate piston valve 3 to continue to compress the liquid inside the sand control screen 1.

[0057] In order to limit the upward movement of the sector plate piston valve 3, a limiting flange is arranged annularly on the top of the inner wall of the sand control screen 1, as shown in the figure. Figures 3 to 5 Wherein, the position of the limiting flange is the highest design point that the sector plate piston valve 3 can reach when moving upward.

[0058] Preferably, the limiting flange includes a plurality of limiting flange segments 11, and the plurality of limiting flange segments 11 are located on the same circle of the limiting flange. For example:

[0059] In order to maintain the stability of the push rod 2 penetrating in the sand control screen 1, still referring to Figures 1 to 5 , the bottom end of the inside of the sand control screen 1 is configured with a stabilizer 12, and the stabilizer 12 is provided with a center hole located on the longitudinal center line of the sand control screen 1, and the bottom end of the push rod 2 penetrates in the center hole of the stabilizer 12.

[0060] As a specific embodiment, the fixed plate 31 includes an upper center cylinder 311 and a plurality of upper sector plates 312, the upper center cylinder 311 includes an inner cylinder 3111 and an outer cylinder 3112, the top of the inner cylinder 3111 and the outer cylinder 3112 are fixedly connected and integrally formed, and the inner cylinder 3111 of the upper center cylinder 311 is sleeved on the outer wall of the push rod 2, as shown in the figure.Figure 6 As shown in the figures, a plurality of upper sector plates 312 are evenly arranged on the outer cylinder 3112 of the upper central cylinder 311 in a ring shape. Figure 11 and Figure 12 As shown in the figures.

[0061] The rotating plate 32 comprises a lower central cylinder 321 and a plurality of lower sector plates 322 evenly arranged on the lower central cylinder 321 in a ring shape. Figure 13 As shown in the figures.

[0062] The outer wall of the bottom of the inner cylinder 3111 of the upper central cylinder 311 and the inner wall of the bottom of the outer cylinder 3112 form a ring-shaped groove 310, and the top of the lower central cylinder 321 is protruded upward to form a ring-shaped flange 320, which is movably inserted into the ring-shaped groove 310 of the upper central cylinder 311. Figure 14 and Figure 15 As shown in the figures.

[0063] Preferably, the shape and number of the lower sector plates 322 are the same as those of the upper sector plates 312 respectively, and the area of the lower sector plates 322 is larger than that of the upper sector plates 312, so that each lower sector plate 322 can be blocked and cover the corresponding upper sector plate 312 when the plurality of lower sector plates 322 and the plurality of upper sector plates 312 respectively overlap.

[0064] Further, in order to control the rotation angle during the rotation of the rotating plate 32 relative to the fixed plate 31, the two sides of the cylinder wall of the inner cylinder 3111 of the upper central cylinder 311 of the fixed plate 31 are respectively provided with an arc-shaped limiting groove 313, and the inner wall of the ring-shaped flange 320 of the lower central cylinder 321 of the rotating plate 32 is respectively provided with an elastic pin 323, when the ring-shaped flange 320 of the lower central cylinder 321 of the rotating plate 32 is movably inserted into the ring-shaped groove 310 of the upper central cylinder 311 of the fixed plate 31, the two elastic pins 323 of the lower central cylinder 321 of the rotating plate 32 are inserted into the two arc-shaped limiting grooves 313 of the upper central cylinder 311 of the fixed plate 31 at the same time. Figure 11 , Figure 13 and Figure 16 As shown in the figures.

[0065] Preferably, each arc-shaped limiting groove 313 is provided with a highest point near the top end of the inner cylinder 3111 and a lowest point near the bottom end of the inner cylinder 3111, and the connecting line between the highest point and the lowest point is in a circular arc shape.

[0066] The two elastic pins 323 make spiral movement along the respective arc-shaped limiting grooves 313, and when the elastic pins 323 move in the arc-shaped limiting grooves 313, the lower center cylinder 321 of the rotating plate 32 rotates, and each lower fan-shaped plate 322 moves close to or away from the corresponding upper fan-shaped plate 312 in the vertical direction.

[0067] Specifically, the elastic pins 323 make spiral movement in the arc-shaped limiting grooves 313, and each lower fan-shaped plate 322 rotates by an angle of 30°.

[0068] In order to control the movement of each lower fan-shaped plate 322 and the corresponding upper fan-shaped plate 312 in the vertical direction, the annular groove 310 of the upper center cylinder 311 is provided with a reset spring 33, as shown in Figures 14 to 16

[0069] When the annular flange 320 of the lower center cylinder 321 of the rotating plate 32 is movably inserted into the annular groove 310 of the upper center cylinder 311 of the fixed plate 31, one end of the reset spring 33 abuts against the top surface wall of the annular groove 310 of the upper center cylinder 311 of the fixed plate 31, and the other end abuts against the top surface wall of the annular flange 320 of the lower center cylinder 321 of the rotating plate 32.

[0070] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.​

Claims

1. A cleanout sand control screen, comprising: The sand control screen pipe (1) is provided with a plurality of filter holes (10) on the surface thereof. A push rod (2) is arranged in the sand control screen pipe (1). A sector plate piston valve (3) is arranged in the sand control screen pipe (1), and the sector plate piston valve (3) comprises a fixed plate (31) and a rotating plate (32), wherein the fixed plate (31) is fixedly arranged on the push rod (2), and the rotating plate (32) is movably arranged at the bottom of the fixed plate (31), and when the rotating plate (32) is rotated to be completely coincident with the fixed plate (31), the sector plate piston valve (3) is in an open state, and when the rotating plate (32) is rotated to be spliced with the fixed plate (31) to form a closed piston, the sector plate piston valve (3) is in a closed state. During the upward movement of the sector plate piston valve (3) to the highest design point, the rotating plate (32) continues to rotate at the bottom of the fixed plate (31) until the rotating plate (32) is completely coincident with the fixed plate (31), so that the sector plate piston valve (3) is completely opened, and the fluid is continuously output upward from the sand control screen pipe (1), and the state is recorded as a normal oil production condition; if the filter holes of the sand control screen pipe (1) are gradually blocked by sand, so that the fluid pressure in the sand control screen pipe (1) is reduced, and the state is recorded as a blockage abnormal condition. Once the normal oil production condition is gradually changed into the blockage abnormal condition, without stopping the production of the oil production equipment, only the closed piston formed by the push rod (2) and the sector plate piston valve (3) needs to be continuously moved downward to compress the liquid in the sand control screen pipe (1), and the liquid flows reversely in the sand control screen pipe (1) to flush and discharge the sand blocked in the filter holes of the sand control screen pipe (1), so that the blockage is solved.

2. The sand control screen pipe according to claim 1, wherein a limiting flange is arranged at the top of the inner wall of the sand control screen pipe (1) in a ring shape, and the limiting flange is used for limiting the upward movement of the sector plate piston valve (3); and the position of the limiting flange is the highest design point that can be reached by the upward movement of the sector plate piston valve (3).

3. The sand control screen pipe according to claim 2, wherein the limiting flange comprises a plurality of limiting flange segments (11), and the plurality of limiting flange segments (11) are located on the same ring of the limiting flange.

4. The sand control screen pipe according to claim 1, wherein a stabilizing frame (12) is arranged at the bottom of the interior of the sand control screen pipe (1), the stabilizing frame (12) is provided with a center hole, the center hole is located on the longitudinal center line of the sand control screen pipe (1), and the bottom end of the push rod (2) is arranged in the center hole of the stabilizing frame (12).

5. The sand control screen pipe according to claim 1, ​ ​ ​ ​ The fixed plate (31) comprises an upper central cylinder (311) and a plurality of upper sector plates (312), the upper central cylinder (311) comprises an inner cylinder (3111) and an outer cylinder (3112), the top of the inner cylinder (3111) and the outer cylinder (3112) are fixedly connected and integrally formed, the inner cylinder (3111) of the upper central cylinder (311) is sleeved on the outer wall of the push rod (2), and the plurality of upper sector plates (312) are annularly and uniformly arranged on the outer cylinder (3112) of the upper central cylinder (311); The rotating plate (32) comprises a lower central cylinder (321) and a plurality of lower sector plates (322), and the plurality of lower sector plates (322) are annularly and uniformly arranged around the lower central cylinder (321); The outer wall of the bottom of the inner cylinder (3111) of the upper central cylinder (311) and the inner wall of the bottom of the outer cylinder (3112) form an annular groove (310), the top of the lower central cylinder (321) is upwardly protruded to form an annular flange (320), and the annular flange (320) of the lower central cylinder (321) is movably inserted into the annular groove (310) of the upper central cylinder (311).

6. The unblocking sand control screen pipe according to claim 5, wherein The shape and number of the lower sector plates (322) are the same as those of the upper sector plates (312) respectively, and the area of the lower sector plates (322) is greater than that of the upper sector plates (312).

7. The unblocking sand control screen pipe according to claim 5, wherein The two sides of the cylinder wall of the inner cylinder (3111) of the upper central cylinder (311) of the fixed plate (31) are respectively provided with an arc-shaped limiting groove (313), The inner wall of the annular flange (320) of the lower central cylinder (321) of the rotating plate (32) is respectively provided with an elastic pin (323) on the two sides, When the annular flange (320) of the lower central cylinder (321) of the rotating plate (32) is movably inserted into the annular groove (310) of the upper central cylinder (311) of the fixed plate (31), the two elastic pins (323) of the lower central cylinder (321) of the rotating plate (32) are simultaneously inserted into the two arc-shaped limiting grooves (313) of the upper central cylinder (311) of the fixed plate (31) respectively.

8. The unblocking sand control screen pipe according to claim 7, wherein Each arc-shaped limiting groove (313) is provided with a highest point near the top end of the inner cylinder (3111) and a lowest point near the bottom end of the inner cylinder (3111), and the line between the highest point and the lowest point is in a circular arc shape; The two elastic pins (323) respectively make spiral movements along the respective arc-shaped limiting grooves (313), and when the elastic pins (323) move in the arc-shaped limiting grooves (313), The lower central cylinder (321) of the rotating plate (32) rotates, and each lower sector plate (322) approaches or moves away from the corresponding upper sector plate (312) in the vertical direction.

9. The unblocking sand control screen pipe according to claim 5, wherein The annular groove (310) of the upper center cylinder (311) is provided with a reset spring (33), When the annular flange (320) of the lower center cylinder (321) of the rotating plate (32) is movably inserted into the annular groove (310) of the upper center cylinder (311) of the fixed plate (31), one end of the reset spring (33) abuts against the top surface wall of the annular groove (310) of the upper center cylinder (311) of the fixed plate (31), and the other end abuts against the top surface wall of the annular flange (320) of the lower center cylinder (321) of the rotating plate (32).

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