Sand control and water control integrated composite screen pipe

Abstract

The application discloses a sand prevention and water control integrated composite screen pipe, which comprises a first base pipe body and a second base pipe body, the first base pipe body and the second base pipe body are connected through a pipeline connecting mechanism, and sand prevention mechanisms are arranged on the first base pipe body and the second base pipe body. The composite screen pipe is composed of four sand prevention layers, namely an outer sheath sand prevention layer, a wire winding sand prevention layer, a pre-packed ceramsite sand prevention layer and a base pipe sand prevention protection layer. Different sand prevention functions are realized in each sand prevention layer to realize precise sand prevention. First grooves and cleaning blocks are arranged on the first base pipe body and the second base pipe body, and V-shaped grooves are formed in the cleaning blocks, the first base pipe body and the second base pipe body. The first base pipe body and the second base pipe body have a self-cleaning function due to the V-shaped grooves, and can independently form a sand prevention guarantee layer (in the case that the front sand prevention layer fails to prevent sand, the sand prevention guarantee layer independently prevents sand). Meanwhile, the sand prevention guarantee layer also supports the pre-packed ceramsite.

Description

Technical Field

[0001] This invention relates to the field of screen tubes, and more particularly to an integrated composite screen tube for sand prevention and water control. Background Technology

[0002] Stainless steel screen pipes, also known as water filter pipes, are widely used in the oil, gas, and water well sand control industry, especially in the water well industry. They are widely used in water resource filtration screen pipes, and are also frequently used in the oil and gas industry. Traditionally, the most commonly used screen pipes are mechanical screen pipes. These mechanical screen pipes consist of a base pipe, a composite sand control filter sleeve, and a stainless steel outer protective sleeve from the inside out. The base pipe uses API standard sleeves or tubing, and the sand control filter sleeve is made of stainless steel woven mesh with different filter pore sizes, which is composite rolled and shaped, and then welded together.

[0003] Traditional screen tubes have a single protective layer, which cannot achieve different screening effects for different sand layers during use. Furthermore, they cannot prevent sand from entering the screen when the outer sand-proof layer fails. The inner base tube cannot self-unblock, which can easily lead to local blockage. Local blockage not only affects the efficiency of the screen tube, but also reduces the flow area of ​​the screen tube, increases the pressure difference and local flow velocity, thereby damaging the screen tube and causing it to fail in sand prevention. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated composite screen tube for sand control and water management to solve the above-mentioned technical problems.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] The integrated sand control and water control composite screen pipe includes a first base pipe body and a second base pipe body. The first base pipe body and the second base pipe body are connected by a pipe connection mechanism. Both the first base pipe body and the second base pipe body are equipped with sand control mechanisms.

[0007] Preferably, the sand-proof mechanism includes a base pipe sand-proof protective layer, and multiple base pipe sand-proof protective layers are respectively fixedly connected to the first base pipe body and the second base pipe body.

[0008] Preferably, a pre-filled ceramsite sand-proof layer is fixedly connected to the surface of the base pipe sand-proof protective layer, and the pre-filled ceramsite sand-proof layer is used for precise sand prevention.

[0009] Preferably, a wire-wound sand-proof layer is fixedly connected to the surface of the pre-filled ceramsite sand-proof layer, and the wire-wound sand-proof layer is used to block medium-grained sand.

[0010] Preferably, an outer sheath sandproof layer is fixedly connected to the surface of the wire-wound sandproof layer, the outer sheath sandproof layer being used to protect the sandproof unit and block coarse sand.

[0011] Preferably, both the first base tube body and the second base tube body are provided with a plurality of first grooves, and a plurality of cleaning blocks are fixedly connected inside the first grooves. The cleaning blocks and the first and second base tube bodies are all provided with V-shaped grooves, and a smooth layer is fixedly provided on the inner wall of the inner cavity of the V-shaped groove.

[0012] The beneficial effects of this invention are:

[0013] 1. The composite screen tube in this invention consists of four sand-proof structures: an outer sheath sand-proof layer, a wire-wound sand-proof layer, a pre-filled ceramsite sand-proof layer, and a base pipe sand-proof protective layer. Each sand-proof layer is designed to perform different sand-proof functions in order to achieve precise sand-proofing.

[0014] 2. By setting a first groove and a cleaning block on the first base pipe body and the second base pipe body, and opening a V-shaped groove on the cleaning block, the first base pipe body and the second base pipe body, the first base pipe body and the second base pipe body have a self-cleaning function by means of the V-shaped groove, and can form a sand protection layer independently (playing an independent sand protection role when the sand protection layer of the preceding sand protection layer fails). At the same time, it also plays a role in supporting the pre-filled ceramic particles.

[0015] 3. The sealing sleeve not only seals the first base pipe body and the second base pipe body, but also makes them more firmly connected under the action of the rotating pressure plate. The threaded connection between the connecting sleeve and the external threaded sleeve, combined with the sealing of the first rubber sealing ring and the second rubber sealing ring, not only can the gaps be further sealed, but the connection can also be strengthened to prevent loosening due to vibration. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention;

[0017] Figure 2 This is a schematic diagram showing the connection between the first base tube body and the cleaning block of the present invention;

[0018] Figure 3 This is a schematic diagram of the sand-prevention mechanism of the present invention;

[0019] Figure 4 This is a schematic diagram of the self-cleaning state within the first base tube body of the present invention;

[0020] Figure 5 This is a schematic diagram showing the state in which a sand bridge is formed outside the first base tube body of the present invention;

[0021] Figure 6 This is a schematic diagram of the pipe connection mechanism of the present invention;

[0022] Figure 7 for Figure 6 Enlarged schematic diagram of part A;

[0023] Figure 8 for Figure 6 Enlarged schematic diagram of part B.

[0024] Reference numerals in the attached drawings: 1. First base pipe body; 2. Outer sheath sandproof layer; 3. Connecting sleeve; 4. Connecting ring; 5. First groove; 6. Cleaning block; 7. V-shaped groove; 8. Limiting ring; 9. Wire-wound sandproof layer; 10. Pre-filled ceramic aggregate sandproof layer; 11. Smooth layer; 12. Second base pipe body; 13. First rubber sealing ring; 14. Sealing sleeve; 15. Sealing ring; 16. Limiting cover; 17. First spring; 18. Rotating groove; 19. Rotating pressure plate; 20. Second spring; 21. Second rubber sealing ring; 22. Sealing groove; 23. External threaded sleeve; 24. Threaded post; 25. Third spring; 26. Extrusion head; 27. Third rubber sealing ring; 28. Limiting groove; 29. ​​Base pipe sandproof protection layer; 30. Sand bridge. Detailed Implementation

[0025] To make the technical means, creative features, achieved objectives, and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this invention and not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention.

[0026] Specific embodiments of the present invention are described below with reference to the accompanying drawings.

[0027] Example 1:

[0028] like Figure 1-5 As shown, the integrated composite screen pipe for sand prevention and water control includes a first base pipe body 1 and a second base pipe body 12. The first base pipe body 1 and the second base pipe body 12 are connected by a pipe connection mechanism. Both the first base pipe body 1 and the second base pipe body 12 are equipped with sand prevention mechanisms.

[0029] The sand control mechanism includes a base pipe sand control protective layer 29, and multiple base pipe sand control protective layers 29 are fixedly connected to the first base pipe body 1 and the second base pipe body 12 respectively;

[0030] A pre-filled ceramsite sand-proof layer 10 is fixedly connected to the surface of the base pipe sand-proof protective layer 29. The pre-filled ceramsite sand-proof layer 10 is used for precise sand prevention.

[0031] A wire-wound sandproof layer 9 is fixedly connected to the surface of the pre-filled ceramsite sandproof layer 10. The wire-wound sandproof layer 9 is used to block medium-grained sand.

[0032] An outer sheath sandproof layer 2 is fixedly connected to the surface of the wire-wound sandproof layer 9. The outer sheath sandproof layer 2 is used to protect the sandproof unit and block coarse sand.

[0033] Based on reservoir rock samples, the reservoir's D90, D75, D50, D10, and heterogeneity coefficient were determined using sieve analysis and a laser particle size analyzer.

[0034] The main function of the outer casing sand control layer 2 is to protect the sand control unit and block coarse sand. The design of the outer casing slot width is based on the reservoir particle size D90. According to the bridging principle, considering the gas well, the slot width is selected as 1.5 times D90.

[0035] The wire-wound sand control layer 9 mainly prevents medium-grained sand. Its sand control accuracy is designed based on the reservoir grain size D75, and the sand control accuracy is designed to be 1.5*D75.

[0036] The pre-filled ceramsite layer is a precise sand control layer. The diameter of the ceramsite is determined according to the reservoir particle size D50 and the Sausier criterion. The diameter of the ceramsite is (5-6) times D50.

[0037] The first base pipe body 1 and the second base pipe body 12 adopt precision micro-slit self-cleaning screen pipes, serving as a sand control guarantee layer (acting as an independent sand control layer in case the sand control layer fails). They also support the pre-filled ceramic aggregate. The sand control precision design of the base pipe is based on the reservoir particle size D10, ensuring sand control effectiveness while also considering production capacity. The slot width is designed as (1.0-1.5)*D10.

[0038] Example 2:

[0039] like Figure 1-5 As shown, while other parts are the same as in Embodiment 1, the difference between this embodiment and Embodiment 1 is that: multiple first grooves 5 are provided on the first base tube body 1 and the second base tube body 12, multiple cleaning blocks 6 are fixedly connected inside the first groove 5, and V-shaped grooves 7 are provided through the cleaning blocks 6 and the first base tube body 1 and the second base tube body 12, and a smooth layer 11 is fixedly provided on the inner wall of the inner cavity of the V-shaped groove 7;

[0040] By opening V-shaped grooves 7 on the cleaning block 6, the first base tube body 1, and the second base tube body 12, and providing a smooth layer 11 on the inner wall of the V-shaped groove 7, making it very smooth, fine sand or mud smaller than the gap width can easily pass through the V-shaped groove without being blocked and staying in the middle of the gap, thus achieving the self-cleaning function.

[0041] Sand larger than the gap width is placed outside the base pipe, forming a highly permeable sand bridge 30 outside the base pipe, which serves as gravel filling outside the base pipe;

[0042] During gas injection, the sand accumulated outside the V-shaped groove 7 is flushed into the wellbore annulus, automatically unblocking and forming a strong self-cleaning ability.

[0043] Example 3:

[0044] like Figure 6-8As shown, while other parts are the same as in Embodiment 1, the difference between this embodiment and Embodiment 1 is that: the pipe connection mechanism includes a connecting sleeve 3, which is fixedly mounted on the first base pipe body 1. The connecting sleeve 3 has an internal thread on its inner wall. A sealing sleeve 14 is provided between the first base pipe body 1 and the second base pipe body 12. A sealing ring 15 is fixedly connected in the middle of the sealing sleeve 14. Sealing grooves 22 are provided on both the left and right sides of the sealing ring 15. The first base pipe body 1 and the second base pipe body 12 are respectively inserted into the two sealing grooves 22.

[0045] Two limiting covers 16 are symmetrically fixedly connected to the inner cavity of the sealing sleeve 14. The limiting covers 16 are inserted into the first base tube body 1 and the second base tube body 12. Multiple rotating grooves 18 are opened on the limiting covers 16. A rotating shaft is rotatably connected inside the rotating grooves 18. A rotating pressure plate 19 is fixedly connected to the rotating shaft. One end of the top of the rotating pressure plate 19 is connected to the sealing sleeve 14 through a second spring 20, and the other end of the top of the rotating pressure plate 19 is connected to the limiting cover 16 through a first spring 17.

[0046] A first rubber sealing ring 13 is provided on the left side of the sealing sleeve 14, and a second rubber sealing ring 21 is provided on the right side of the sealing sleeve 14;

[0047] The second base tube body 12 is rotatably connected to an external threaded sleeve 23, which is threadedly connected to the connecting sleeve 3. A connecting ring 4 is fixedly connected to the external threaded sleeve 23. An arc-shaped groove is opened on the left side of the connecting ring 4. A third rubber sealing ring 27 is set inside the arc-shaped groove. A limit groove 28 is provided through the connecting ring 4. A threaded post 24 is threadedly connected inside the limit groove 28. A third spring 25 is set inside the limit groove 28. One end of the third spring 25 is in contact with the threaded post 24, and the other end of the third spring 25 is fixedly connected to a compression head 26.

[0048] When the sealing sleeve 14 is inserted into the first base tube body 1, the sealing sleeve 14 will rub against the inner wall of the connecting sleeve 3, and the first base tube body 1 will rub against the limiting cover 16, thus playing a double sealing and fixing role. When the first base tube body 1 is inserted into the limiting cover 16, it will squeeze the rotating pressure plate 19. The end of the rotating pressure plate 19 close to the first base tube body 1 will continuously squeeze the first base tube body 1 under the tension of the first spring 17, playing a fixing role. The end of the rotating pressure plate 19 away from the first base tube body 1 will pull the rotating pressure plate 19 under the tension of the second spring 20, so that the other end of the rotating pressure plate 19 can better squeeze the first base tube body 1, and play a better fixing role.

[0049] By setting a sealing ring 15 and opening a sealing groove 22 on the sealing ring 15, the sealing state at the connection between the first base pipe body 1 and the second base pipe body 12 can be better guaranteed.

[0050] By setting the first rubber sealing ring 13 and the second rubber sealing ring 21, the connection gap between the sealing sleeve 14 and the first base pipe body 1 and the second base pipe body 12 can be strengthened to enhance the seal.

[0051] When the sealing sleeve 14 is installed on the first base pipe body 1, the second base pipe body 12 can be inserted into the sealing sleeve 14. Since the second base pipe body 12 is rotatably connected with the external threaded sleeve 23, the external threaded sleeve 23 can be rotated while the second base pipe body 12 is moving, so that the external threaded sleeve 23 is threadedly connected with the connecting sleeve 3, thereby further fixing the first base pipe body 1 and the second base pipe body 12 together, and the operation is simple.

[0052] In order to ensure the seal of the gap at the connection between the connecting sleeve 3 and the external threaded sleeve 23, the threaded column 24 can be rotated to compress the third spring 25. The third spring 25 drives the compression head 26 to compress the third rubber sealing ring 27, so that the third rubber sealing ring 27 can play a sealing role at the gap.

[0053] The first rubber sealing ring 13, the second rubber sealing ring 21, and the third rubber sealing ring 27 are all placed at the gap and have a certain degree of elasticity, which can play a certain role in buffering.

[0054] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An integrated composite screen pipe for sand control and water management, comprising a first base pipe body (1) and a second base pipe body (12), characterized in that: The first base pipe body (1) and the second base pipe body (12) are connected by a pipe connection mechanism. Both the first base pipe body (1) and the second base pipe body (12) are equipped with sand prevention mechanisms. The first base tube body (1) and the second base tube body (12) are provided with a plurality of first grooves (5), and a plurality of cleaning blocks (6) are fixedly connected inside the first grooves (5). V-shaped grooves (7) are provided through the cleaning blocks (6), the first base tube body (1), and the second base tube body (12); a smooth layer (11) is fixedly provided on the inner wall of the inner cavity of the V-shaped groove (7). The pipe connection mechanism includes a connecting sleeve (3), which is fixedly installed on the first base pipe body (1). The inner wall of the connecting sleeve (3) is provided with an internal thread. A sealing sleeve (14) is provided between the first base pipe body (1) and the second base pipe body (12). A sealing ring (15) is fixedly connected in the middle of the inside of the sealing sleeve (14). Sealing grooves (22) are provided on both the left and right sides of the sealing ring (15). The first base pipe body (1) and the second base pipe body (12) are respectively inserted into the two sealing grooves (22). The inner cavity of the sealing sleeve (14) is symmetrically fixedly connected with two limiting covers (16). The limiting covers (16) are inserted into the first base tube body (1) and the second base tube body (12). Multiple rotating grooves (18) are opened on the limiting covers (16). A rotating shaft is rotatably connected inside the rotating grooves (18). A rotating pressure plate (19) is fixedly connected on the rotating shaft. One end of the top of the rotating pressure plate (19) is connected to the sealing sleeve (14) through the second spring (20), and the other end of the top of the rotating pressure plate (19) is connected to the limiting cover (16) through the first spring (17).

2. The integrated composite screen pipe for sand control and water management according to claim 1, characterized in that: The sand-proof mechanism includes a base pipe sand-proof protective layer (29), and multiple base pipe sand-proof protective layers (29) are fixedly connected to the first base pipe body (1) and the second base pipe body (12) respectively.

3. The integrated composite screen pipe for sand control and water management according to claim 2, characterized in that: A pre-filled ceramic aggregate sand-proof layer (10) is fixedly connected to the surface of the base pipe sand-proof protective layer (29), and the pre-filled ceramic aggregate sand-proof layer (10) is used for precise sand prevention.

4. The integrated composite screen pipe for sand control and water management according to claim 3, characterized in that: A wire-wound sand-proof layer (9) is fixedly connected to the surface of the pre-filled ceramsite sand-proof layer (10), which is used to block medium-grained sand.

5. The integrated composite screen pipe for sand control and water management according to claim 4, characterized in that: An outer sheath sandproof layer (2) is fixedly connected to the surface of the wire-wound sandproof layer (9), and the outer sheath sandproof layer (2) is used to block coarse sand.

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