Sliding sleeve screen pipe sand prevention device and pipe column

Abstract

The invention belongs to the technical field of oil exploitation, and particularly relates to a sliding sleeve screen pipe sand prevention device and a pipe column. An upper connector, a filter screen pipe and a lower connector of the sliding sleeve screen pipe sand prevention device are sequentially connected in the vertical direction to form an operation space, a plurality of filter pieces are arranged on the circumferential face of the filter screen pipe at intervals, a sliding sleeve is operably arranged in the operation space in a movable fit mode, a plurality of sealing pieces are arranged on the outer circumferential face of the sliding sleeve, and the sealing pieces and the filter pieces are correspondingly arranged. The seal is operable to occlude a corresponding filter. According to the sand prevention device for the sliding sleeve screen pipe, sand-carrying liquid and stratum liquid can be prevented from entering the screen pipe from the sliding sleeve screen pipe to the maximum extent, the functions of filling and closing the sliding sleeve can be achieved at a time, operation is easy and convenient, operation procedures are not increased, operation time is short, cost is low, and good practicability is achieved.

Description

Technical Field

[0001] The present application belongs to the technical field of oil extraction, and in particular relates to a sliding sleeve screen pipe sand prevention device and a pipe string. Background Art

[0002] At present, in the field of petroleum sand control technology, gravel packing sand control technology is widely used because of its good sand control effect and suitability for fine silt sand formations. For oil and gas wells with large interlayer conflicts and many layers requiring stratified oil production, segmented gravel packing sand control strings or general gravel packing blind pipe isolation segmented strings are mainly adopted.

[0003] The segmented gravel pack sand control string mainly adopts the intermediate isolation packer to achieve interlayer isolation. However, the structure of the string is complex, and the gravel packing operation needs to be carried out multiple times according to the number of oil well segments. The operation time is long, and the string cost and operation cost are greatly increased. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a sliding sleeve screen sand control device and a pipe string, which can to a certain extent solve the technical problems of multiple lifting and lowering of sand control pipe strings and multiple sand flushing operations during sand control operations, resulting in a long operation cycle.

[0005] The technical solution of this application is:

[0006] In a first aspect of the present application, the present application discloses a sliding sleeve screen sand control device, the device comprising: an upper joint, a filter screen and a lower joint, which are connected in sequence along the vertical direction to form a working space, and a plurality of filter elements are arranged at intervals on the circumferential surface of the filter screen; a sliding sleeve, which is operably movably arranged in the working space, and a plurality of sealing elements are arranged on the outer circumferential surface of the sliding sleeve, and the sealing elements and the filter elements are arranged correspondingly, and the sealing elements can operably block the corresponding filter elements.

[0007] The present application provides a sliding sleeve screen tube sand prevention device. Since a plurality of filter elements are arranged at intervals on the circumferential surface of the filter screen tube of the device, under the condition that the sealing element does not block the corresponding filter element, the filter screen tube has the same function as an ordinary screen tube, has certain flow performance and sand retaining performance, and is convenient for gravel filling operation. After the gravel filling operation is completed, the sliding sleeve is moved so that the sealing element on the outer circumferential surface of the sliding sleeve blocks the corresponding filter element. After the formation fluid flows through the filter element, it cannot enter the interior of the filter screen tube, which can prevent sand-carrying fluid and formation fluid from entering the interior of the screen tube from the sliding sleeve screen tube to the greatest extent, and can meet the functions of filling and closing the sliding sleeve at one time. The operation is simple, no operation process is added, the operation time is short, and the cost is low, and it has good practicality.

[0008] In some embodiments, a plurality of sealing grooves corresponding to the sealing members are arranged on the circumferential surface of the sliding sleeve, the sealing members are arranged in the corresponding sealing grooves, and the sealing members have sealing portions protruding from the surfaces of the sealing grooves.

[0009] In some embodiments, a supporting protrusion is provided on the inner wall of the upper joint; and a plurality of supporting blocks which can be suspended on the supporting protrusion are provided at intervals on the outer peripheral surface of the top end of the sliding sleeve.

[0010] In some embodiments, the outer circumferential surface of the top of the support block is provided with a first guiding slope, and the bottom end of the support block is perpendicular to the outer circumferential surface of the support block.

[0011] In some embodiments, the top end of the support protrusion is perpendicular to the inner wall of the support protrusion; and the inner wall of the bottom end of the support protrusion is provided with a second guiding slope.

[0012] In some embodiments, the upper joint is provided with a limiting groove, the lower side wall of the limiting groove is the top of the supporting protrusion, and the upper side wall of the limiting groove is perpendicular to the central axis of the upper joint.

[0013] In some embodiments, the device further comprises: a sleeve, which is sleeved on the outer peripheral surface of the filter screen tube and is arranged between the upper joint and the lower joint, the sleeve expands when in contact with liquid, and the sleeve is provided with a plurality of connecting parts, and the connecting parts are correspondingly connected to the filter element.

[0014] In some embodiments, the upper connector and the top of the filter screen are connected by threads.

[0015] In some embodiments, the lower connector and the bottom of the filter screen are connected by threads.

[0016] In the second aspect of the present application, the present application also provides a tubular column, which includes: a packer; a screen pipe, the top end of which is connected to the packer, and the middle part of the screen pipe is provided with the above-mentioned sliding sleeve screen pipe sand prevention device; an oil pipe, which is arranged in the screen pipe and connected to the sliding sleeve to drive the sliding sleeve to move in the working space.

[0017] The pipe column provided by the present application has a plurality of filter elements arranged at intervals on the circumferential surface of the filter screen. Under the condition that the sealing element does not block the corresponding filter element, the filter screen has the same function as an ordinary screen and has certain flow-through performance and sand-retaining performance, which is convenient for gravel filling operation. After the gravel filling operation is completed, the sliding sleeve is moved so that the sealing element on the outer circumferential surface of the sliding sleeve blocks the corresponding filter element. After the formation fluid flows through the filter element, it cannot enter the interior of the filter screen, which can prevent sand-carrying fluid and formation fluid from entering the interior of the screen from the sliding sleeve screen to the greatest extent, and can meet the functions of filling and closing the sliding sleeve at one time. The operation is simple, no operation process is added, the operation time is short, and the cost is low, which has good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] In the attached figure:

[0020] Figure 1 It is a structural schematic diagram of a sliding sleeve screen sand control device disclosed in an embodiment of the present application in a filling operation state;

[0021] Figure 2 This is a structural schematic diagram of a sliding sleeve screen sand control device in a closed state disclosed in an embodiment of the present application;

[0022] Figure 3 for Figure 2 A is an enlarged schematic diagram;

[0023] Figure 4 To have Figure 1 and Figure 2 The structural schematic diagram of the pipe string of the sliding sleeve screen sand control device shown;

[0024] Figure 5 for Figure 4 The schematic diagram of the structure of the pipe string in the production state is shown.

[0025] Reference numerals:

[0026] Upper joint-100, supporting protrusion-101, second guiding inclined surface-1011, limiting groove-102;

[0027] Filter screen-200, filter element-201,

[0028] Lower connector - 300;

[0029] Sliding sleeve 400, sealing element 401, sealing groove 402, supporting block 403, first guiding inclined surface 4031, liquid passage hole 404;

[0030] Sleeve-500, connecting part-501;

[0031] Packer - 600;

[0032] Screen tube-700;

[0033] Tubing -800. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0036] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and examples of materials provided by the present application, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0037] The present application is described below with reference to the accompanying drawings and specific embodiments:

[0038] The embodiment of the present application provides a sliding sleeve screen sand control device and a pipe string, which can solve the technical problem that the sand control pipe string needs to be raised and lowered multiple times and the sand flushing operation cycle is long during the sand control operation to a certain extent.

[0039] In a first aspect of the present application, an embodiment of the present application discloses a sliding sleeve screen sand control device. Figure 1 This is a structural schematic diagram of a sliding sleeve screen sand control device disclosed in an embodiment of the present application in a filling operation state. Figure 2This is a structural schematic diagram of a sliding sleeve screen sand control device in a closed state disclosed in an embodiment of the present application, combined with Figure 1-Figure 2 The device includes an upper joint 100, a filter screen tube 200 and a lower joint 300 which are connected in sequence along the vertical direction.

[0040] It should be noted that when the device is not in use, such as during assembly and manufacturing, the upper joint 100, the filter screen tube 200 and the lower joint 300 of the device may also be arranged in a horizontal direction or an oblique direction, etc., without limitation herein.

[0041] In the embodiment of the present application, the upper joint 100, the filter screen 200 and the lower joint 300 are connected in sequence to form a working space. Among them, the upper joint 100 is connected to the top of the filter screen 200 by threading, and the upper joint 100 and the top of the filter screen 200 are sealed by a sealing ring or other means. The filter screen 200 can be a slit screen 700 or an elastic screen 700 or other monomer screen 700 structure. The outer diameter of the filter screen 200 can be smaller than the outer diameter of the upper joint 100, so that the upper joint 100 is connected to the outside of the top of the filter screen 200. The bottom of the filter screen 200 is connected to the lower joint 300 by threading, and the bottom of the filter screen 200 and the lower joint 300 are sealed by a sealing ring or other means. The outer diameter of the filter screen 200 can be larger than the outer diameter of the lower joint 300, so that the lower joint 300 is connected to the inner side of the bottom of the filter screen 200.

[0042] Combination Figure 1 as well as Figure 2 A plurality of filter elements 201 are arranged at intervals on the circumference of the filter screen tube 200. When the filter elements 201 are not blocked, the filter screen tube 200 has the same function as the ordinary screen tube 700, that is, it has certain flow performance and sand retaining performance to facilitate gravel filling operations.

[0043] Combination Figure 1 as well as Figure 2The device also includes a sliding sleeve 400, which is operably movably arranged in the above-mentioned working space. A plurality of liquid holes 404 and a plurality of sealing members 401 are arranged on the outer peripheral surface of the sliding sleeve 400. The sealing members 401 and the filter members 201 are arranged correspondingly, and the sealing members 401 can operably block the corresponding filter members 201. During the filling operation, the sealing element 401 and the corresponding filter element 201 are staggered, and the sand-carrying formation fluid enters into the interior of the pipe string through the filter element 201 on the filter screen 200 and the liquid hole 404 on the sleeve 400 to ensure the density of the gravel filling outside the pipe string; after the filling is completed, the sleeve 400 is moved so that the sealing element 401 on the outer peripheral surface of the sleeve 400 blocks the corresponding filter element 201, and the filter element 201 is sealed. After the formation fluid flows through the filter element 201, it cannot enter the interior of the filter screen 200, so that the filter screen 200 forms a blind pipe, which can prevent the sand-carrying fluid and formation fluid from entering the interior of the screen 700 from the sleeve 400 screen 700 to the greatest extent, and can meet the functions of filling and closing the sleeve 400 at one time, which is simple to operate, does not increase the operation process, has a short operation time, and has low cost, and has good practicality.

[0044] Combination Figure 1 as well as Figure 2 The peripheral surface of the sleeve 400 is provided with a plurality of sealing grooves 402 corresponding to the sealing element 401. The sealing element 401 is arranged in the corresponding sealing grooves 402. The sealing element 401 has a sealing portion protruding from the surface of the sealing grooves 402. During the filling operation, the sealing portion on the sealing element 401 is in close contact with the inner wall of the filter screen 200, so that the formation fluid flowing from the filter element 201 on the filter screen 200 can enter the area between the sleeve 400 and the filter screen 200, and can only enter the interior of the pipe string from the plurality of liquid holes 404 on the sleeve 400; after the filling operation is completed, the sealing element 401 moves with the sleeve 400, and the sealing portion on the sealing element 401 blocks the corresponding filter element 201 to seal the filter element 201, so that the formation fluid cannot enter the interior of the screen 700 through the filter element 201.

[0045] In some embodiments, the seal 401 may be an O-ring, and a seal 401 may be correspondingly disposed in a sealing groove 402; in other embodiments, if the size of the sealing groove 402 is too large, a plurality of seals 401 may be filled in a sealing groove 402 so that the seal 401 is firmly disposed in the corresponding sealing groove 402, and the seal 401 does not fall off from the corresponding sealing groove 402 when the sleeve 400 moves.

[0046] Figure 3 for Figure 2 A in the figure is enlarged. Figure 1-Figure 3In some embodiments, a support protrusion 101 may be provided on the inner wall of the upper joint 100, and a plurality of support blocks 403 that can be suspended on the support protrusion 101 are provided at intervals on the outer peripheral surface of the top end of the sliding sleeve 400. The above-mentioned support protrusion 101 is preferably annular, and can be integrally formed, welded or screwed to the inner wall of the upper joint 100, and the plurality of support blocks 403 are provided at intervals on the outer peripheral surface of the top end of the sliding sleeve 400, and the plurality of support blocks 403 can form a claw structure. When a force is applied to the sliding sleeve 400, the plurality of support blocks 403 shrink inwardly to separate from the support protrusion 101, so that the sliding sleeve 400 can move downward in the filter screen tube 200, so that the filter element 201 and the sealing element 401 can be connected. staggered to carry out filling operation; accordingly, the operating sleeve 400 is moved upward, and the multiple support blocks 403 are retracted inwardly inside the support protrusion 101. When passing through the top of the support protrusion 101, the multiple support blocks 403 restore their deformation and are hung on the support protrusion 101, so that the sleeve 400 is suspended and fixed in the working space. Under this condition, the sealing element 401 blocks the corresponding filter element 201 to seal the filter element 201, and the formation fluid cannot pass through the filter element 201 into the screen tube 700.

[0047] Combination Figure 1-Figure 3 In some embodiments, a first guide slope 4031 is provided on the outer peripheral surface of the top of the support block 403. When the operating sleeve 400 moves upward, the support block 403 can be retracted from the lower end of the support protrusion 101 along the first guide slope 4031 to facilitate the sliding upward operation. The first guide slope 4031 can be set between 30-60°, which can be set accordingly according to the actual construction and is not limited here.

[0048] Combination Figure 1-Figure 3 In some embodiments, the bottom end of the support block 403 is perpendicular to the outer circumference of the support block 403, so as to prevent the support block 403 from detaching from the support protrusion 101 after the sliding sleeve 400 is in place, causing the sliding sleeve 400 to change from a fixed state to a sliding state.

[0049] Combination Figure 1-Figure 3 In some embodiments, the top of the support protrusion 101 is perpendicular to the inner wall of the support protrusion 101, and cooperates with the bottom of the support block 403 to prevent the support block 403 from detaching from the support protrusion 101 after the sliding sleeve 400 is in place, so that the sliding sleeve 400 changes from a fixed state to a sliding state; Figure 1-Figure 3 The inner wall of the bottom end of the supporting protrusion 101 is provided with a second guiding slope 1011. When the operating sleeve 400 moves upward, the first guiding slope 4031 on the supporting block 403 can be retracted along the second guiding slope 1011 to facilitate the sliding upward operation. The second guiding slope 1011 can also be set between 30-60 degrees, which can be set accordingly according to the actual construction and is not limited here.

[0050] Combination Figure 1-Figure 3 In some embodiments, the upper joint 100 is provided with a limiting groove 102, the lower side wall of the limiting groove 102 is the top of the supporting protrusion 101, the upper side wall of the limiting groove 102 is perpendicular to the central axis of the upper joint 100, and the depth of the limiting groove 102 is preferably greater than the length of the supporting block 403. Such a setting can provide operating space for the upward movement of the sliding sleeve 400, and can also set the limit position of the sliding sleeve 400 when moving upward, so that the sliding sleeve 400 is firmly suspended on the supporting protrusion 101.

[0051] In the related art, the effect of external isolation mainly depends on the density of gravel filling. When the screen tube 700 is long, the gravel filling outside the tube is not full and is relatively loose. At this time, the isolation effect cannot meet the production demand, affecting the stratified oil recovery effect. Figure 1 as well as Figure 2 Based on this, the sliding sleeve screen sand control device shown in the embodiment of the present application also includes a casing 500, which is sleeved on the outer peripheral surface of the filter screen 200 and is arranged between the upper joint 100 and the lower joint 300. The casing 500 can expand when in contact with liquid. The casing 500 is provided with a plurality of connecting parts 501, and the connecting parts 501 are correspondingly connected to the filter element 201. In specific implementation, the casing 500 can be made of rubber material that expands when encountering liquid (oil or water), and its outer diameter is less than or equal to the outer diameter of the upper joint 100, and the inner diameter of the casing 500 is equal to the outer diameter of the filter screen 200. A certain number of holes are arranged on the circumference of the casing 500 to serve as the connecting part 501 of the casing 500. During production operations, the formation fluid carrying sand enters the interior of the pipe string through the connecting part 501 on the casing 500, the filter element 201 on the filter screen 200, and the liquid hole 404 on the sliding sleeve 400. In addition, the casing 500 expands and deforms by absorbing water or oil, and continues to squeeze the gravel outside the filter screen 200, continues to increase the density of the gravel, and reduces the radial thickness of the gravel packing layer outside the pipe, which greatly reduces the permeability of the gravel packing layer in the interlayer section. After the operation is completed, the filter screen 200 that forms a blind pipe cooperates with the filled gravel to form an "interlayer packer 600". Since the gravel packing rate and packing effect outside the pipe column are improved, the sand control effect of the oil well is also improved accordingly. Due to the increase in the density of the gravel packing and the decrease in the radial thickness of the packing layer, when the fluid flows axially through the gravel packing layer outside the pipe, the packing pressure of the "interlayer packer 600" is greatly increased, thereby improving the effect of stratified oil production in the oil well.

[0052] In a second aspect of the present application, the present application also provides a tubular column. Figure 4 To have Figure 1 and Figure 2 The schematic diagram of the structure of the pipe string of the sliding sleeve screen sand control device is shown in FIG. Figure 5for Figure 4 The structural diagram of the pipe string in production state is shown in FIG. Figure 4 as well as Figure 5 The pipe string includes a packer 600, a screen 700 and an oil pipe 800. The top of the screen 700 is connected to the packer 600, and the middle of the screen 700 is provided with the above-mentioned sliding sleeve screen sand control device; the oil pipe 800 is arranged in the screen 700 and connected to the sliding sleeve 400 to drive the sliding sleeve 400 to move in the working space. The assembly relationship of the packer 600, the screen 700 and the oil pipe is the existing technology and will not be described in detail here.

[0053] The pipe column provided by the present application has a plurality of filter elements 201 arranged at intervals on the circumferential surface of the filter screen tube 200. Under the condition that the seal element 401 does not block the corresponding filter element 201, the filter screen tube 200 has the same function as the ordinary screen tube 700, has certain flow performance and sand retaining performance, and is convenient for gravel filling operation. After the gravel filling operation is completed, the sleeve 400 is moved so that the seal element 401 on the outer circumferential surface of the sleeve 400 blocks the corresponding filter element 201. After the formation fluid flows through the filter element 201, it cannot enter the interior of the filter screen tube 200, which can prevent sand-carrying fluid and formation fluid from entering the interior of the screen tube 700 from the sleeve 400 and the screen tube 700 to the greatest extent, and can meet the functions of filling and closing the sleeve 400 at one time. The operation is simple, no operation process is added, the operation time is short, and the cost is low, which has good practicality.

[0054] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0001] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0002] In addition, in this application, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0003] In the description of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0004] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0005] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0006] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A sliding sleeve screen sand control device, characterized in that: The device comprises: The upper joint, the filter screen tube and the lower joint are connected in sequence along the vertical direction to form a working space, and a plurality of filter elements are arranged at intervals on the peripheral surface of the filter screen tube; The sliding sleeve is operably movably arranged in the working space. A plurality of sealing elements are arranged on the outer peripheral surface of the sliding sleeve. The sealing elements and the filter elements are arranged correspondingly. The sealing elements can operably block the corresponding filter elements.

2. The sliding sleeve screen sand control device according to claim 1, characterized in that: A plurality of sealing grooves corresponding to the sealing members are arranged on the peripheral surface of the sliding sleeve, the sealing members are arranged in the corresponding sealing grooves, and the sealing members have sealing portions protruding from the surfaces of the sealing grooves.

3. The sliding sleeve screen sand control device according to claim 1, characterized in that: A supporting protrusion is provided on the inner wall of the upper joint; A plurality of support blocks which can be suspended on the support protrusions are arranged at intervals on the outer peripheral surface of the top end of the sliding sleeve.

4. The sliding sleeve screen sand control device according to claim 3, characterized in that: The outer circumferential surface of the top of the support block is provided with a first guiding inclined surface, and the bottom end of the support block is perpendicular to the outer circumferential surface of the support block.

5. The sliding sleeve screen sand control device according to claim 4, characterized in that: The top end of the support protrusion is perpendicular to the inner wall of the support protrusion; the inner wall of the bottom end of the support protrusion is provided with a second guiding inclined surface.

6. The sliding sleeve screen sand control device according to claim 5, characterized in that: The upper joint is provided with a limiting groove, the lower side wall of the limiting groove is the top of the supporting protrusion, and the upper side wall of the limiting groove is perpendicular to the central axis of the upper joint.

7. The sliding sleeve screen sand control device according to any one of claims 1 to 6, characterized in that: The device also includes: The sleeve is sleeved on the outer peripheral surface of the filter screen tube and is arranged between the upper joint and the lower joint. The sleeve expands under the condition of contacting the liquid. The sleeve is provided with a plurality of communication parts, and the communication parts are correspondingly communicated with the filter element.

8. The sliding sleeve screen sand control device according to any one of claims 1 to 6, characterized in that: The upper joint and the top of the filter screen are connected by threads.

9. The sliding sleeve screen sand control device according to any one of claims 1 to 6, characterized in that: The lower joint and the bottom of the filter screen are connected via threads.

10. A pipe column, characterized in that: The pipe column comprises: Packer; A screen pipe, the top of which is connected to the packer, and the middle of which is provided with a sliding sleeve screen pipe sand control device according to any one of claims 1 to 9; The oil pipe is arranged in the screen tube and connected with the sliding sleeve to drive the sliding sleeve to move in the working space.

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