A multi-stage sand-proof screen pipe

Abstract

This utility model discloses a multi-stage sand-proof screen tube, belonging to the field of sand-proof screen tube technology. The technical solution includes: a screen tube body with screen holes on the surface; a snap-fit ​​mechanism located at both ends of the screen tube body for assembling adjacent screen tube bodies; a wire winding layer located on the outer periphery of the screen tube body; and a filter screen located on the outer periphery of the wire winding layer. The beneficial effects of this utility model include: (1) it has a multi-stage filtration function for small sand particles in the oil layer, making it more practical; (2) it enables different groups of screen tube bodies to be quickly and stably connected together, improving assembly efficiency; and (3) it greatly increases the ease of operation of moving the sand-proof screen tube into the oil layer.

Description

Technical Field

[0001] This utility model relates to a multi-stage sand-proof screen pipe, belonging to the technical field of sand-proof screen pipes. Background Technology

[0002] Oil extraction refers to the work of digging and extracting oil in places where oil is stored. Early oil and gas wells used gravel packing, resin sand fixation and other sand control technologies, but there were problems such as complex construction, high cost and easy blockage, especially in horizontal wells where the effect was limited. In the 1980s, with the popularization of horizontal well technology, screen pipes were introduced as a more efficient sand control tool. Sand control screen pipes are a type of downhole tool used in oil extraction. In order to promote the normal production of oil and gas wells and extend the service life of oil and gas wells, sand control screen pipes are used to prevent sand in the oil layer from entering the interior of the oil and gas well. In China, plain weave mesh is commonly used as the filter layer for screen pipes. The overall manufacturing cost is low and the strength is low. Internationally, Dutch twill mesh (DTW) and reverse Dutch twill mesh (RDTW) are also commonly used. Screen pipes are usually composed of the following layers: (1) Base pipe: a steel pipe with holes or slots to provide structural support. (2) Filter layer: multiple layers of metal mesh, metal wool or composite materials to block sand particles. (3) Protective Cover: An outer protective cover to prevent damage to the screen pipe when it is lowered into the wellbore. In terms of materials, stainless steel, nickel-based alloys, or coating technology are used to improve durability under high temperature, high pressure, and acidic environments. Composite filter materials, such as multi-layer sintered metal mesh and ceramic coatings, are used to optimize filtration accuracy and permeability. Traditional sand-filtering screens can only filter a single type of sand.

[0003] Traditional sand control screens typically filter sand from the oil layer only through the screen holes on the screen. This filtration method is limited and can only filter a single type of sand, resulting in poor performance.

[0004] For traditional sieve tubes, relevant patents provide specific technical solutions, as exemplified below:

[0005] Chinese invention patent application CN106285573A discloses a sand-control screen pipe. The technical solution of this patent involves creating filter slits along the axial direction of the base pipe. These slits block sand particles from entering the production layer, thus achieving a sand-control function. However, since the width of the filter slits is fixed, it can only filter a single type of sand particle, resulting in a relatively limited filtration effect.

[0006] Chinese invention patent application CN1834401A discloses a sand-blocking screen pipe that uses the gap between the base pipe and the outer pipe for filtration to prevent sand. However, this technical solution also suffers from the same defects as patent CN106285573A, where the filtration effect is limited. Utility Model Content

[0007] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a multi-stage sand filter tube to filter small sand particles in the oil layer, so that the sand filter tube has a better screening effect.

[0008] The technical solution of this utility model is: a multi-stage sand-control screen pipe, comprising:

[0009] The main body of the sieve tube has sieve holes on its surface;

[0010] The snap-fit ​​mechanism, located at both ends of the screen tube body, is used to assemble adjacent screen tube bodies;

[0011] The wire winding layer is located on the outer periphery of the screen tube body;

[0012] The filter screen is located on the outer periphery of the wire winding layer.

[0013] The locking mechanism includes a locking block on a connecting seat a at one end of the screen tube body and an elastic rotating locking device on a connecting seat b at the other end of the screen tube body. The locking block slides in cooperation with the sliding groove on the connecting seat b. The locking block is provided with a locking groove. The elastic rotating locking device engages with the locking groove of the locking block on the adjacent screen tube body.

[0014] The elastic rotary snap-fit ​​device includes symmetrically arranged rotating wheels on the connecting seat b. The rotating wheels are rotatably connected to the connecting seat b. A snap-fit ​​post is fixed on the rotating wheel. The two ends of the spring are respectively connected to the connecting seat b and the snap-fit ​​post. The snap-fit ​​post is engaged with the snap-fit ​​groove of the snap-fit ​​block on the adjacent screen tube body.

[0015] The connecting seat b has receiving grooves a and b. The rotating wheel is rotatably disposed in receiving groove a via a rotating shaft, the spring is disposed in receiving groove b, and the snap-fit ​​post is movably disposed in receiving groove a.

[0016] The card slots are symmetrically arranged on both sides of the card block.

[0017] A support frame is fixed to the outer periphery of the screen tube body, and the wire winding layer is fixed to the outer periphery of the screen tube body by the support frame.

[0018] Both connecting seat a and connecting seat b are provided with fixing seats. The two ends of the mesh frame are respectively connected and fixed to the fixing seats on connecting seat a and connecting seat b. The filter screen is fixed to the outer periphery of the winding layer through the mesh frame.

[0019] Several hoisting auxiliary mechanisms for easy lifting are evenly distributed around the outer periphery of the connecting seat b.

[0020] The hoisting mechanism includes a lifting ring rotatably connected to the connecting seat b, a connecting plate on the lifting ring, a snap-fit ​​groove in the middle of the connecting plate, and a snap-fit ​​block on the fixed seat that snaps into the snap-fit ​​groove.

[0021] A connecting block is fixed on the connecting seat b, and a connecting shaft is provided on the connecting block. The lifting ring is rotatably connected to the connecting block through the connecting shaft.

[0022] The beneficial effects of this utility model include:

[0023] (1) It has a multi-stage filtration function for small sand particles in the oil layer, making it more practical.

[0024] (2) It enables different groups of screen tubes to be quickly and stably connected together, improving assembly efficiency.

[0025] (3) The ease of operation of moving the sand screen tube into the oil layer is greatly increased. Attached Figure Description

[0026] Figure 1 This is a view showing the connection between two sieve tubes;

[0027] Figure 2 This is a structural diagram of the present invention;

[0028] Figure 3 for Figure 1 A magnified view of a portion of the image;

[0029] Figure 4 for Figure 2 A magnified view of a portion of the image.

[0030] The attached figures are labeled as follows:

[0031] 1. Screen tube body; 2. Screen holes; 3. Wire winding layer; 4. Filter screen; 5.1. Connecting seat a; 5.2. Locking block; 5.3. Connecting seat b; 5.4. Rotating wheel; 5.5. Locking post; 5.6. Spring; 5.7. Rotating shaft; 6. Support frame; 7. Screen frame; 8.1. Lifting ring; 8.2. Connecting plate; 8.3. Locking block; 8.4. Connecting block; 9. Fixing seat. Detailed Implementation

[0032] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0034] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views showing the device structure may be partially enlarged, not according to the usual proportions. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0036] The present invention will now be described in further detail with reference to the accompanying drawings: This application will be further described and explained using this example.

[0037] Example 1

[0038] A multi-stage sand-control screen tube includes: a screen tube body 1 with screen holes 2 on its surface; a snap-fit ​​mechanism located at both ends of the screen tube body 1 for assembling adjacent screen tube bodies 1; a support frame 6 fixed to the outer periphery of the screen tube body 1, and the wire winding layer 3 fixed to the outer periphery of the screen tube body 1 through the support frame 6; and a filter screen 4 located on the outer periphery of the wire winding layer 3. The snap-fit ​​mechanism includes a snap block 5.2 on a connecting seat a5.1 at one end of the screen tube body 1 and an elastic rotary snap-fit ​​device on a connecting seat b5.3 at the other end of the screen tube body 1. The snap block 5.2 slides in cooperation with a groove on the connecting seat b5.3, and the snap block 5.2 is provided with a slot. The elastic rotary snap-fit ​​device engages with the slot of the snap block 5.2 on the adjacent screen tube body 1. The elastic rotary snap-fit ​​device includes a rotating wheel 5.4 symmetrically arranged on the connecting seat b5.3. The rotating wheel 5.4 is rotatably connected to the connecting seat b5.3. A snap-fit ​​post 5.5 is fixed on the rotating wheel 5.4. The two ends of the spring 5.6 are respectively connected to the connecting seat b5.3 and the snap-fit ​​post 5.5. The snap-fit ​​post 5.5 engages with the snap-fit ​​groove of the snap-fit ​​block 5.2 on the adjacent screen tube body 1. The snap-fit ​​groove is symmetrically arranged on both sides of the snap-fit ​​block 5.2, thereby improving the stability of the snap-fit.

[0039] The connecting seat b5.3 has receiving grooves a and b. The rotating wheel 5.4 is rotatably mounted in receiving groove a via a rotating shaft 5.7. The spring 5.6 is mounted in receiving groove b. The locking post 5.5 is movably mounted in receiving groove a. The locking block 5.2 is movably mounted in the sliding groove of the connecting seat b5.3. Before the locking block 5.2 contacts the locking post 5.5, the movable end of the locking post 5.5 extends into the sliding groove under the action of the spring 5.6. When it is necessary to assemble two screen tubes, the locking block 5.2 of the rear screen tube enters the sliding groove of the front screen tube (e.g., ...). Figure 1 and Figure 3 As shown, with the movement of the locking block 5.2, it contacts the locking posts 5.5 on both sides. The locking block 5.2 pushes the locking posts 5.5 to rotate. When the locking groove on the locking block 5.2 is opposite to the end of the locking post 5.5, under the action of the spring 5.6, the end of the locking post 5.5 moves into the locking groove, realizing the locking and fixing of the locking post 5.5 and the locking groove, thereby completing the rapid assembly of two adjacent screen tubes. This locking mechanism has four parts, evenly distributed on the outer periphery of the connecting seat b5.3, thereby improving the structural stability of the screen tubes after assembly.

[0040] Both the connecting seat a5.1 and the connecting seat b5.3 are provided with fixing seats 9. The two ends of the mesh frame 7 are respectively connected and fixed to the fixing seats 9 on the connecting seat a5.1 and the connecting seat b5.3. The filter screen 4 is fixed to the outer periphery of the winding layer 3 through the mesh frame 7.

[0041] Example 2

[0042] As a supplement to Embodiment 1, four sets of lifting auxiliary mechanisms for easy hoisting are evenly distributed around the outer periphery of the connecting seat b5.3. The hoisting mechanism includes a lifting ring 8.1 rotatably connected to the connecting seat b5.3. The lifting ring 8.1 is provided with a connecting plate 8.2, and the connecting plate 8.2 has a locking groove in its center. The fixed seat 9 is provided with a locking block 8.3 that engages with the locking groove. The connecting block 8.2 is fixed to the connecting seat b5.3, and the connecting block 8.2 is provided with a connecting shaft. The lifting ring 8.1 is rotatably connected to the connecting block 8.2 through the connecting shaft.

[0043] When hoisting the sand screen pipe, flip the lifting ring 8.1 so that the locking block 8.3 engages with the locking groove, thereby limiting the lifting ring 8.1. After limiting, use the hook to hang the lifting ring 8.1, and then use the crane to pull the lifting rope. The lifting rope drives the hook to hoist the sand screen pipe and install it into the oil layer.

[0044] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A multi-stage sand-control screen pipe, characterized in that, include: The main body (1) of the sieve tube has sieve holes (2) on its surface; The snap-fit ​​mechanism is located at both ends of the screen tube body (1) and is used to assemble adjacent screen tube bodies (1). The wire winding layer (3) is located on the outer periphery of the screen tube body (1); The filter screen (4) is located on the outer periphery of the wire layer (3).

2. The multi-stage sand-control screen pipe according to claim 1, characterized in that, The locking mechanism includes a locking block (5.2) on a connecting seat a (5.1) at one end of the screen tube body (1) and an elastic rotating locking device on a connecting seat b (5.3) at the other end of the screen tube body (1). The locking block (5.2) slides in cooperation with the groove on the connecting seat b (5.3). The locking block (5.2) is provided with a locking groove. The elastic rotating locking device engages with the locking groove of the locking block (5.2) on the adjacent screen tube body (1).

3. The multi-stage sand-control screen pipe according to claim 2, characterized in that, The elastic rotary snap-fit ​​device includes a rotating wheel (5.4) symmetrically arranged on the connecting seat b (5.3). The rotating wheel (5.4) is rotatably connected to the connecting seat b (5.3). A snap-fit ​​post (5.5) is fixed on the rotating wheel (5.4). The two ends of the spring (5.6) are respectively connected to the connecting seat b (5.3) and the snap-fit ​​post (5.5). The snap-fit ​​post (5.5) is engaged with the snap-fit ​​groove of the snap-fit ​​block (5.2) on the adjacent screen tube body (1).

4. The multi-stage sand-control screen pipe according to claim 3, characterized in that, The connecting seat b (5.3) has a receiving groove a and a receiving groove b. The rotating wheel (5.4) is rotatably disposed in the receiving groove a via the rotating shaft (5.7). The spring (5.6) is disposed in the receiving groove b. The snap-fit ​​post (5.5) is movably disposed in the receiving groove a.

5. The multi-stage sand-control screen pipe according to claim 3, characterized in that, The card slots are symmetrically arranged on both sides of the card block (5.2).

6. The multi-stage sand-control screen pipe according to claim 1, characterized in that, The screen tube body (1) is fixed with a support frame (6) on its outer periphery, and the wire winding layer (3) is fixed on the outer periphery of the screen tube body (1) by the support frame (6).

7. The multi-stage sand-control screen pipe according to claim 3, characterized in that, Both the connecting seat a (5.1) and the connecting seat b (5.3) are provided with fixing seats (9). The two ends of the mesh frame (7) are connected and fixed to the fixing seats (9) on the connecting seat a (5.1) and the connecting seat b (5.3) respectively. The filter screen (4) is fixed to the outer periphery of the winding layer (3) through the mesh frame (7).

8. The multi-stage sand-control screen pipe according to claim 7, characterized in that, The outer periphery of the connecting seat b (5.3) is evenly distributed with several hoisting auxiliary mechanisms to facilitate hoisting.

9. The multi-stage sand-control screen pipe according to claim 8, characterized in that, The hoisting auxiliary mechanism includes a lifting ring (8.1) that is rotatably connected to the connecting seat b (5.3). The lifting ring (8.1) is provided with a connecting plate (8.2). The connecting plate (8.2) is provided with a snap-fit ​​groove in the middle. The fixed seat (9) is provided with a snap-fit ​​block (8.3) that snaps into the snap-fit ​​groove.

10. The multi-stage sand-control screen pipe according to claim 9, characterized in that, A connecting block (8.4) is fixed on the connecting seat b (5.3). A connecting shaft is provided on the connecting block (8.4). The lifting ring (8.1) is rotatably connected to the connecting block (8.4) through the connecting shaft.

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