Drag reduction screen

Abstract

The present invention relates to the field of screen pipe technology, and more specifically, to a drag-reducing screen pipe. The drag-reducing screen pipe provided by the present invention comprises a screen pipe, a guide wheel, and a steering pipe. The screen pipes are provided in a plurality of pieces, and the plurality of screen pipes are directly or indirectly connected in sequence. The guide wheel is connected to the front end of the screen pipe and can roll along the borehole. There is at least one steering pipe connected between two screen pipes, and one end of the steering pipe can be deflected relative to the other end. The drag-reducing screen pipe provided by the present invention can effectively increase the depth of the screen pipe being lowered, which is conducive to achieving the purpose of lowering the screen pipe into place.

Description

Technical Field

[0001] The present invention relates to the technical field of screen tubes, and in particular to a drag-reducing screen tube. Background Art

[0002] my country's broken and soft coal seams are numerous and widely distributed. During the drilling and extraction of coal seam gas, it is necessary to lower a screen pipe into the borehole to prevent the borehole from collapsing and clogging after drilling in the soft coal seams.

[0003] According to the different pipe lowering processes, it can be divided into two categories, namely, the final hole drilling and lowering screen pipe protection technology and the final hole drilling and lowering screen pipe protection technology. Among them, the final hole drilling and lowering screen pipe protection technology commonly uses ordinary straight screen pipes, which makes it difficult to lower the screen pipe into place.

[0004] In summary, how to overcome the above-mentioned defects of the existing sieve tubes is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] The object of the present invention is to provide a drag-reducing screen pipe to alleviate the technical problem that the screen pipe in the prior art is difficult to lower into place.

[0006] The drag-reducing screen pipe provided by the present invention comprises a screen pipe, a guide wheel and a steering pipe.

[0007] There are a plurality of screen pipes, which are directly or indirectly connected in sequence. The guide wheel is connected to the front end of the screen pipe, and the guide wheel can roll along the borehole.

[0008] There is at least one steering tube connected between the two screen tubes, and one end of the steering tube can be deflected relative to the other end.

[0009] Preferably, as an implementable embodiment, the guide wheel is a universal wheel;

[0010] And / or, the steering tube is a universal tube, one end of which can be deflected in any direction relative to the other end.

[0011] Preferably, as an implementation method, the drag reduction screen tube further includes a drag reduction tube, the drag reduction tube includes a drag reduction tube body and a drag reduction wheel, the drag reduction wheel is installed around the side of the drag reduction tube body, and the drag reduction wheel protrudes from the outer side wall of the drag reduction tube body.

[0012] There is at least one drag reduction tube connected between the screen pipe and the guide wheel, and / or there is at least one drag reduction tube connected between two screen pipes, and / or there is at least one drag reduction tube connected between the screen pipe and the steering pipe.

[0013] Preferably, as an implementable embodiment, the outer wall of the drag reduction tube body is provided with at least one circle of wheel holes, the drag reduction wheel is installed in the wheel hole, and the drag reduction wheel can rotate in the wheel hole.

[0014] The drag reduction tube further includes an annular axle, which surrounds the drag reduction tube body and is rotatably engaged with at least two of the drag reduction wheels. The drag reduction wheels and the annular axle support each other in a limited manner.

[0015] Preferably, as an implementable embodiment, a positioning groove is provided on the outer wall of the drag reduction tube body, and the annular wheel shaft cooperates with the positioning groove.

[0016] Preferably, as an implementable embodiment, the annular axle is in a circular ring shape.

[0017] Preferably, as an implementable embodiment, the center of the annular wheel shaft coincides with the central axis of the drag reducing tube;

[0018] And / or, the sizes of the wheel holes are consistent, and the sizes of the drag reduction wheels are consistent.

[0019] Preferably, as an implementable embodiment, the wheel holes in the same circle are evenly arranged along the circumferential direction.

[0020] Preferably, as an implementable embodiment, the guide wheel is connected to the screen pipe by plugging, threading, welding or gluing;

[0021] and / or, two adjacent screen pipes are connected by splicing, threading, welding or gluing;

[0022] And / or, the screen pipe is connected to the steering pipe by plugging, threading, welding or gluing;

[0023] And / or, two adjacent steering tubes are connected by splicing, threading, welding or gluing;

[0024] And / or, the drag reduction tube is connected to the guide wheel by plugging, threading, welding or gluing;

[0025] And / or, the drag reduction tube is connected to the screen tube by plugging, threading, welding or gluing.

[0026] Preferably, as an embodiment, the guide wheel has a first convex socket or a first concave socket, the two ends of the screen tube have a second convex socket and a second concave socket respectively, the two ends of the steering tube have a third convex socket and a third concave socket respectively, the two ends of the drag reduction tube have a fourth convex socket and a fourth concave socket respectively, and the first convex socket is plugged into the second concave socket.

[0027] The first male socket, the second male socket, the third male socket and the fourth male socket have the same shape, and the first female socket, the second female socket, the third female socket and the fourth female socket have the same shape.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The drag-reducing screen pipe provided by the present invention is connected to a guide wheel at the front end of the screen pipe. When the screen pipe is lowered, the guide wheel first enters the borehole and rolls along the borehole, and the rear screen pipe follows the guide wheel and is lowered into the borehole in sequence. Under the guiding action of the guide wheel, the lowering resistance of the screen pipe is greatly reduced, especially when there is a bend or a slight collapse in the borehole, the guide wheel can pass through smoothly and drive the rear screen pipe to pass through smoothly. Therefore, the screen pipe is not likely to be blocked during the lowering process and cannot be lowered further. The lowering depth of the screen pipe can be effectively increased, which is conducive to achieving the purpose of lowering the screen pipe into place.

[0030] In addition, one end of the steering tube is deflected relative to the other end, so that the steering tube has a steering function, thereby enabling the screen pipes connected to the two ends of the steering tube to be relatively deflected. Cooperating with the guide wheel at the front end, the screen pipe can be adaptively turned along the borehole when being lowered, and can be applied to curved boreholes. That is, when the borehole is a curved borehole, the screen pipe can also be lowered into place, solving the problem that the conventional screen pipe lowering hole protection technology is difficult to use in curved kilometer-long directional drilling holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0032] Figure 1 A schematic structural diagram of a drag-reducing screen tube provided in an embodiment of the present invention;

[0033] Figure 2 A schematic structural diagram of a guide wheel in a drag-reducing screen tube provided in an embodiment of the present invention;

[0034] Figure 3 A schematic structural diagram of a drag reduction tube in a drag reduction screen tube provided in an embodiment of the present invention;

[0035] Figure 4 A schematic structural diagram of a steering tube in a drag-reducing screen tube provided in an embodiment of the present invention;

[0036] Figure 5 A schematic structural diagram of a screen tube in a drag-reducing screen tube provided in an embodiment of the present invention.

[0037] Description of reference numerals:

[0038] 100 - screen tube; 110 - second male socket; 120 - second female socket;

[0039] 200 - guide wheel; 210 - roller; 220 - first rotating shaft; 230 - second rotating shaft; 240 - bracket; 250 - wheel seat; 251 - first recessed socket;

[0040] 300 - steering tube; 310 - third male socket; 320 - third female socket;

[0041] 400 - drag reduction tube; 410 - drag reduction tube body; 411 - wheel hole; 412 - positioning groove; 420 - drag reduction wheel; 430 - annular wheel axle; 440 - fourth convex socket; 450 - fourth concave socket. DETAILED DESCRIPTION

[0042] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0043] The present invention will be further described in detail below through specific implementation examples in conjunction with the accompanying drawings.

[0044] See also Figure 1 This embodiment provides a drag-reducing screen pipe, which includes a screen pipe 100, a guide wheel 200, and a steering tube 300. The screen pipes 100 are multiple, and the multiple screen pipes 100 are directly or indirectly connected in sequence. The guide wheel 200 is connected to the front end of the screen pipe 100 and can roll along the borehole. There is at least one steering tube 300 connected between two screen pipes 100, and one end of the steering tube 300 can deflect relative to the other end.

[0045] The drag-reducing screen pipe provided in this embodiment is connected to a guide wheel 200 at the front end of the screen pipe 100. When the screen pipe 100 is lowered, the guide wheel 200 first enters the borehole and rolls along the borehole, and the rear screen pipe 100 follows the guide wheel 200 and is lowered into the borehole in sequence. Under the guiding action of the guide wheel 200, the lowering resistance of the screen pipe 100 is greatly reduced, especially when there is a bend or a slight collapse in the borehole, the guide wheel 200 can pass through smoothly and drive the rear screen pipe 100 to pass through smoothly. Therefore, the screen pipe 100 is not likely to be blocked during the lowering process and cannot be lowered further, which can effectively increase the lowering depth of the screen pipe 100, which is conducive to achieving the purpose of lowering the screen pipe 100 into place.

[0046] In addition, one end of the steering tube 300 is deflected relative to the other end, so that the steering tube 300 has a steering function, thereby enabling the screen pipes 100 connected to the two ends of the steering tube 300 to be relatively deflected. In conjunction with the guide wheel 200 at the front end, the screen pipe 100 can adaptively turn along the borehole when lowered, and can be applied to curved boreholes. That is, when the borehole is a curved borehole, the screen pipe 100 can also be lowered into place, solving the problem that conventional screen pipe lowering and hole protection technology is difficult to use in curved kilometer-long directional drilling holes.

[0047] The number of steering tubes 300 can be set as needed.

[0048] Preferably, see Figure 2 The guide wheel 200 can be configured as a universal wheel, which improves the guiding effect and makes the screen pipe 100 less likely to be blocked. Specifically, the guide wheel 200 includes a roller 210, a first rotating shaft 220, a second rotating shaft 230, a bracket 240, and a wheel seat 250. The bracket 240 and the wheel seat 250 rotate together through the first rotating shaft 220, and the roller 210 rotates directly through the second rotating shaft 230. The first rotating shaft 220 and the second rotating shaft 230 are perpendicular to each other. In this way, a universal function can be achieved. On this basis, the wheel seat 250 can be connected to the screen pipe 100.

[0049] Accordingly, see Figure 4 The steering tube 300 can be configured as a universal tube, so that the drag reduction screen provided by this embodiment can be applied to boreholes curved in various directions, with a wider range of applications. Specifically, the universal tube can be configured as a cross universal tube, a bamboo universal tube, or a spherical universal tube.

[0050] In addition, see Figure 1, a drag reducing tube 400 may be additionally provided. At least one drag reducing tube 400 may be optionally connected between the screen pipe 100 and the guide wheel 200, or between two screen pipes 100, or between the screen pipe 100 and the steering pipe 300. In other words, the drag reducing tube 400 may be added between any two structures.

[0051] Specifically, see Figure 3 The drag reduction tube 400 may include a drag reduction tube body 410 and a drag reduction wheel 420, wherein the drag reduction wheel 420 is installed around the side of the drag reduction tube body 410 and protrudes from the outer wall of the drag reduction tube body 410. In this way, the drag reduction wheel 420 can contact the wall of the borehole, so that the drag reduction wheel 420 can roll along the wall of the borehole, while part or all of the drag reduction tube body 410 does not need to contact the borehole, and even other structures close to the drag reduction tube body 410 do not need to contact the borehole, thereby converting sliding friction into rolling friction. In this way, the friction resistance encountered by the drag reduction screen pipe when it is lowered into the borehole can be greatly reduced, making the lowering of the screen pipe 100 smoother and easier to achieve the purpose of lowering the screen pipe 100 into place.

[0052] Preferably, at least one circle of wheel holes 411 can be formed on the outer wall of the drag reduction tube body 410, and the drag reduction wheels 420 can be installed in the wheel holes 411. The drag reduction wheels 420 can rotate in the wheel holes 411 in which they are located. In the specific structure of the drag reduction tube 400, an annular wheel shaft 430 can also be provided. The annular wheel shaft 430 surrounds the drag reduction tube body 410 and is rotatably matched with at least two drag reduction wheels 420, so that the drag reduction wheels 420 and the annular wheel shaft 430 can mutually limit and support each other. Therefore, the drag reduction wheels 420 are not easily separated from the wheel holes 411 in which they are located. With this arrangement, there is no need to consider the fixation of the annular wheel shaft 430, which facilitates improved assembly efficiency.

[0053] Furthermore, a positioning groove 412 can be opened on the outer wall of the drag reduction tube body 410, and the annular wheel axle 430 can be matched with the positioning groove 412 to limit the annular wheel axle 430 using the positioning groove 412. As a result, the annular wheel axle 430 is less likely to be misplaced, and the drag reduction wheel 420 is less likely to be separated from the wheel hole 411 in which it is located, and the structural reliability is stronger.

[0054] Specifically, the shape of the annular axle 430 can be set to a circular ring shape, that is, the drag reduction wheel 420 matched with the same annular axle 430 is arranged in the same plane perpendicular to the drag reduction tube 400. This is beneficial to improving the force balance of the annular axle 430, making the annular axle 430 less likely to deform, ensuring the position reliability of the drag reduction wheel 420, and making it less likely for the drag reduction wheel 420 to fall out of the wheel hole 411.

[0055] Preferably, the center of the annular wheel shaft 430 is set to coincide with the central axis of the drag reduction tube 400 , so that the force balance of the annular wheel shaft 430 can be further improved.

[0056] The sizes of the wheel holes 411 and the drag reduction wheels 420 can also be set to be consistent, so that the force on the annular wheel shaft 430 is more balanced and the drag reduction wheels 420 are not easily dislodged from the wheel holes 411.

[0057] Furthermore, the wheel holes 411 in the same circle are evenly arranged along the circumferential direction, which not only makes the force distribution at each angle of the drilling hole and the rent reduction pipe 400 more uniform, but also further improves the force balance of the annular wheel shaft 430.

[0058] In particular, the guide wheel 200 and the screen pipe 100 can be connected by plugging, threading, welding or gluing. Two adjacent screen pipes 100, the screen pipe 100 and the steering pipe 300, two adjacent steering pipes 300, the drag reduction pipe 400 and the guide wheel 200, and the drag reduction pipe 400 and the screen pipe 100 can also be connected by plugging, threading, welding or gluing, respectively. That is, any two adjacent structures that need to be connected can be connected by plugging, threading, welding or gluing.

[0059] Specifically, see Figure 1-Figure 5 A first convex socket or a first concave socket 251 can be provided on the guide wheel 200, a second convex socket 110 and a second concave socket 120 can be provided at both ends of the screen pipe 100, a third convex socket 310 and a third concave notch 320 can be provided at both ends of the steering tube 300, and a fourth convex socket 440 and a fourth concave socket 450 can be provided at both ends of the drag reduction tube 400. The first convex socket can be plugged into and matched with the second concave socket 120, so that the guide wheel 200 and the screen pipe 100 can be plugged into each other.

[0060] The shapes of the first convex socket, the second convex socket 110, the third convex socket 310 and the fourth convex socket 440 are all set to be consistent, so that the second convex socket 110, the third convex socket 310 and the fourth convex socket 440 can all be plugged and matched with the second concave socket 120, thereby realizing the plugging and matching of the screen pipe 100, the steering pipe 300 and the drag reduction tube 400 with the screen pipe 100; the shapes of the first concave socket 251, the second concave socket 120, the third concave socket 320 and the fourth concave socket 450 are set to be consistent, so that the fourth concave socket 450 can be plugged and matched with the first convex socket, thereby realizing the plugging and matching of the guide wheel 200 and the drag reduction tube 400, and the fourth convex socket 440 can also be plugged and matched with the first concave socket 251, thereby realizing the plugging and matching of the guide wheel 200 and the drag reduction tube 400. In addition, the first concave socket 251, the third concave socket 320 and the fourth concave socket 450 can also be plugged and matched with the second convex socket 110, and the plugging and matching of the guide wheel 200, the steering tube 300 and the drag reduction tube 400 with the screen pipe 100 can also be realized; the third convex socket 310 can also be matched with the third concave socket 320, and the plugging and matching of two adjacent steering tubes 300 can be realized. Thus, the mutual plugging and matching of any two adjacent structural members can be realized, and the steering tube 300 and the drag reduction tube 400 can be added at any position as needed to meet the requirements of different drilling.

[0061] In summary, the present invention discloses a drag-reducing screen pipe that overcomes many technical drawbacks of conventional screen pipes. The drag-reducing screen pipe provided by the present invention can effectively increase the lowering depth of the screen pipe 100, thereby facilitating the lowering of the screen pipe 100 into place.

[0062] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A drag reducing screen tube, characterized in that: Including screen pipe, guide wheel and steering pipe; There are a plurality of screen pipes, which are directly or indirectly connected in sequence. The guide wheel is connected to the front end of the screen pipe, and the guide wheel can roll along the drill hole. There is at least one steering tube connected between the two screen tubes, and one end of the steering tube is capable of deflecting relative to the other end; The drag reduction screen tube further includes a drag reduction tube, which includes a drag reduction tube body and a drag reduction wheel. The drag reduction wheel is mounted around the side of the drag reduction tube body, and the drag reduction wheel protrudes from the outer side wall of the drag reduction tube body. There is at least one drag reduction tube connected between the screen pipe and the guide wheel, and / or, there is at least one drag reduction tube connected between two screen pipes, and / or, there is at least one drag reduction tube connected between the screen pipe and the steering pipe; The outer wall of the drag reduction tube body is provided with at least one circle of wheel holes, the drag reduction wheel is installed in the wheel hole, and the drag reduction wheel can rotate in the wheel hole; The drag reduction tube further includes an annular axle, which surrounds the drag reduction tube body and is rotatably engaged with at least two of the drag reduction wheels. The drag reduction wheels and the annular axle support each other in a limited manner.

2. The drag reduction screen according to claim 1, characterized in that: The guide wheel is a universal wheel; And / or, the steering tube is a universal tube, one end of which can be deflected in any direction relative to the other end.

3. The drag reduction screen according to claim 1, characterized in that: A positioning groove is provided on the outer wall of the drag reduction tube body, and the annular wheel shaft cooperates with the positioning groove.

4. The drag reduction screen according to claim 3, characterized in that: The annular wheel shaft is in a circular ring shape.

5. The drag reduction screen according to claim 4, characterized in that: The center of the annular wheel shaft coincides with the central axis of the drag reduction tube; And / or, the sizes of the wheel holes are consistent, and the sizes of the drag reduction wheels are consistent.

6. The drag reduction screen according to claim 4, characterized in that: The wheel holes in the same circle are evenly arranged along the circumferential direction.

7. The drag reduction screen according to any one of claims 1 to 6, characterized in that: The guide wheel is connected to the screen pipe by plugging, threading, welding or gluing; and / or, two adjacent screen pipes are connected by splicing, threading, welding or gluing; And / or, the screen pipe is connected to the steering pipe by plugging, threading, welding or gluing; And / or, two adjacent steering tubes are connected by splicing, threading, welding or gluing; And / or, the drag reduction tube is connected to the guide wheel by plugging, threading, welding or gluing; And / or, the drag reduction tube is connected to the screen tube by plugging, threading, welding or gluing.

8. The drag reduction screen according to any one of claims 1 to 6, characterized in that: The guide wheel has a first convex socket or a first concave socket, the two ends of the screen tube respectively have a second convex socket and a second concave socket, the two ends of the steering tube respectively have a third convex socket and a third concave socket, the two ends of the drag reduction tube respectively have a fourth convex socket and a fourth concave socket, and the first concave socket is plugged into the second convex socket; The first male socket, the second male socket, the third male socket and the fourth male socket have the same shape, and the first female socket, the second female socket, the third female socket and the fourth female socket have the same shape.

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