Pipeline sealing device

Abstract

The present invention provides a pipeline sealing and plugging device, which belongs to the technical field of oil and gas pipeline maintenance. Among them, the pipeline sealing and plugging device includes: a main support, a rotating arm and a plug, one end of the rotating arm is rotatably connected to the main support; and the plug includes a piston rod, a hydraulic cylinder body and a rubber tube, the piston rod is connected to the other end of the rotating arm, when the plug enters the pipeline and the axes of the two are parallel, the hydraulic oil circuit is introduced into the hydraulic cylinder body through the piston rod, and the hydraulic cylinder body moves to drive the rubber tube to expand along its circumferential direction until it is tightly attached to the inner wall of the pipeline. The plug of the present invention adopts a special piston rod oil-passing hydraulic cylinder structure inside, which is fixed by the piston rod, and the hydraulic cylinder body moves to cause the rubber tube to expand along its circumferential direction until the outer diameter of the rubber tube increases to be in close contact with the inner wall of the pipeline, so as to achieve sealing and plugging of the pipeline.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas pipeline maintenance, and in particular relates to a pipeline sealing and plugging device. Background Art

[0002] With the long-term operation of oil and gas pipelines and the changes in urban planning, oil and gas pipelines often need to be replaced, repaired, rerouted, and other operations. Pipeline non-stop plugging technology has been adopted for a long time as a safe and reliable operation method. Traditional single-stage disc plugging technology is widely used, but this technology has defects such as welds and iron filings in the pipe that are not tightly sealed. In order to solve the above problems, an isolation airbag needs to be installed in the plugging process to isolate the leaked medium of the single-stage disc plugging head, which will increase the construction cost and the sealing accuracy is poor.

[0003] Therefore, it is necessary to propose a new pipeline sealing and plugging device. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art and provides a pipeline sealing and plugging device.

[0005] The present invention provides a pipeline sealing and plugging device, comprising: a main support, a rotating arm and a plug, wherein one end of the rotating arm is rotatably connected to the main support; and

[0006] The plug includes a piston rod, a hydraulic cylinder body and a rubber tube. The piston rod is connected to the other end of the rotating arm. When the plug enters the pipeline and the axes of the two are parallel, the hydraulic oil circuit is introduced into the hydraulic cylinder body through the piston rod. The hydraulic cylinder body moves and drives the rubber tube to expand along its circumferential direction until it is tightly attached to the inner wall of the pipeline.

[0007] Optionally, the hydraulic cylinder body includes a first cylinder head, a second cylinder head and a compression ring sandwiched between the first cylinder head and the second cylinder head; wherein,

[0008] The rubber cylinder is arranged on a side of the compression ring away from the first cylinder cover. A thrust ring is also fixedly arranged on the side of the rubber cylinder away from the compression ring. The compression ring compresses the rubber cylinder as the hydraulic cylinder body moves.

[0009] Optionally, a first seal is provided between the first cylinder head and the compression ring, and a second seal is provided between the second cylinder head and the thrust ring.

[0010] Optionally, a first axial fixing member is provided between the piston rod and the rotating arm, and a pressure plate flange is provided on the side of the thrust ring facing away from the rubber cylinder, and a second axial fixing member is provided between the pressure plate flange and the piston rod.

[0011] Optionally, a steering positioning member is provided on the main support, and when the plug enters the pipeline along the vertical direction, the steering positioning member adjusts the angle between the rotating arm and the main support.

[0012] Optionally, the angle between the rotating arm and the main support ranges from 1° to 3°.

[0013] Optionally, the device further comprises a support ring, and the support ring is sleeved on the main support.

[0014] Optionally, a guide frame is provided on the side of the piston rod facing away from the rotating arm, and at least one guide wheel is provided on the guide frame. After the plug enters the pipeline, the guide wheel moves in the pipeline in turn and drives the rotating arm to rotate toward the side away from the main bracket.

[0015] Optionally, the guide frame is provided with a first guide wheel along its axial direction; and / or,

[0016] A second guide wheel is also arranged at the bottom of the guide frame.

[0017] Optionally, a third guide wheel is provided at the bottom of the thrust ring; and / or,

[0018] A top block is arranged on the top of the thrust ring.

[0019] The present invention provides a pipeline sealing and plugging device, comprising: a main support, a rotating arm and a plug, one end of the rotating arm is rotatably connected to the main support; and the plug comprises a piston rod, a hydraulic cylinder body and a rubber tube, the piston rod is connected to the other end of the rotating arm, when the plug enters the pipeline and the axes of the two are parallel, the hydraulic oil circuit is introduced into the hydraulic cylinder body through the piston rod, the hydraulic cylinder body moves and then drives the rubber tube to expand along its circumferential direction until it is tightly attached to the inner wall of the pipeline. The plug of the present invention adopts a special piston rod oil-passing hydraulic cylinder structure inside, which is fixed by the piston rod, and the hydraulic cylinder body moves to make the rubber tube expand along its circumferential direction until the outer diameter of the rubber tube increases to be in close contact with the inner wall of the pipeline, so as to achieve sealing and plugging of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a pipeline sealing and plugging device according to an embodiment of the present invention;

[0021] Figure 2 It is a structural schematic diagram of a pipeline sealing and plugging device according to another embodiment of the present invention;

[0022] Figure 3 A cross-sectional view of a pipeline sealing and plugging device according to another embodiment of the present invention;

[0023] FIG. 4A to FIG. 4EThe present invention is a schematic diagram of a sealing process of a pipeline sealing and plugging device according to another embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0025] Unless otherwise specified, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The terms "including" or "comprising" used in the present invention neither limit the shapes, numbers, steps, actions, operations, components, originals and / or their groups mentioned, nor exclude the presence or addition of one or more other different shapes, numbers, steps, actions, operations, components, originals and / or their groups. In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number and order of the indicated technical features.

[0026] In some descriptions of the invention, unless otherwise expressly specified and limited, the terms "install", "connect", "connected" or "fixed" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect through an intermediate medium, internal connections between two elements or mutual interaction between two elements. Also, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating positions or positional relationships based on the positions or positional relationships shown in the drawings, are only used to indicate relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0027] like Figures 1 to 3As shown, the present invention provides a pipeline sealing and plugging device 100, comprising: a main support 110, a rotating arm 120 and a plug 130, one end of the rotating arm 120 is rotatably connected to the main support 110, the main support 110 is used to install and fix the rotating arm 120, and the other end of the rotating arm 120 is connected to the plug 130. Among them, the plug 130 includes a piston rod 131, a hydraulic cylinder body and a rubber tube 132, the piston rod 131 is connected to the other end of the rotating arm 120, and combined with FIG. 4, when the plug 130 enters the pipeline 200 and the axes of the two are parallel, the hydraulic oil circuit is introduced into the hydraulic cylinder body through the piston rod 131, and the hydraulic cylinder body moves to drive the rubber tube 132 to expand along its circumferential direction until the outer diameter of the rubber tube 132 increases to be close to the inner wall of the pipeline 200.

[0028] In this embodiment, the plug is inserted into the pipeline by rotating the rotating arm, and a special piston rod and oil-passing hydraulic cylinder structure is adopted inside the plug. The plug is fixed by the piston rod, and the hydraulic cylinder body moves to expand the rubber cylinder to achieve sealing and plugging of the pipeline. Compared with the traditional interference fit seal between the rubber cup and the inner wall of the pipeline, the sealing pressure bearing capacity of this embodiment is stronger and can withstand a maximum medium pressure of 10MPa in the pipeline, and the sealing pressure bearing capacity of the spiral welded pipe is the same as that of the seamless pipe.

[0029] Specifically, Figures 1 to 3 As shown, the hydraulic cylinder body includes a first cylinder head 133, a second cylinder head 134 and a compression ring 135 sandwiched between the first cylinder head 133 and the second cylinder head 134. Among them, the rubber cylinder 132 is arranged on the side of the compression ring 135 away from the first cylinder head 133, and the side of the rubber cylinder 132 away from the compression ring 135 is also fixed with a thrust ring 136, that is, the thrust ring is fixed, and the compression ring 135 moves with the hydraulic cylinder body to compress the rubber cylinder 132, so that the rubber cylinder 132 expands along its circumferential direction. It should be understood that this example should also be provided with two hydraulic pipes 141, and a hydraulic pipe connecting mechanism 142 connected to the hydraulic pipe is provided at the top of the main bracket 110, and the mechanism is connected to the top of the main bracket through a pin. That is to say, one end of the hydraulic pipe 141 is connected to the piston rod 131, and the other end is connected to the hydraulic pipe connecting mechanism 142. In addition, the hydraulic pipe connecting mechanism should also be connected to a power device (not shown in the figure), through which the hydraulic oil circuit is entered and recovered.

[0030] like Figure 1As shown in FIG4 , based on the above structure, when the plug is lowered into the pipeline and the axis of the plug is parallel to the axis of the pipeline, two hydraulic oil circuits are introduced through the piston rod 131 end on one side of the plug rotating arm 120, and the cylinder barrel as a whole translates to the right along the piston rod 131 when the oil inlet chamber is filled with oil through the hydraulic pipe 141, and the thrust ring 136 is fixed, thereby driving the compression ring 135 to compress the rubber cylinder 132, so that the rubber cylinder 132 expands in the circumferential direction, and the outer diameter of the rubber cylinder 132 increases until it is in close contact with the inner wall of the pipeline 200, thereby achieving sealing and plugging of the pipeline. Compared with the traditional over-win seal between the rubber cup and the inner wall of the pipeline, this sealing and plugging form of the present embodiment has a stronger sealing pressure bearing capacity and can withstand a maximum medium pressure of 10MPa in the pipeline, and the sealing pressure bearing capacity of the spiral welded pipe is the same as that of the seamless pipe.

[0031] Please continue to refer to Figure 1 As to Figure 4, it should be understood that after the plug of this embodiment is successfully sealed, the pipeline modification is completed, and oil is supplied to the return oil chamber. At this time, the cylinder barrel as a whole translates to the left along the piston rod 131, thereby releasing the compression of the rubber cylinder 132, and the outer diameter of the rubber cylinder 132 is reduced to the initial outer diameter. At this time, the outer diameter of the plug 130 is reduced to the minimum, and then the plug 130 can be easily lifted out of the pipeline 200 without any obstruction at the pipe mouth.

[0032] In order to ensure that the pipeline medium does not penetrate into the hydraulic cylinder body, a first seal is provided between the first cylinder head and the compression ring, and a second seal is provided between the second cylinder head and the thrust ring. In other words, the cylinder barrel structure uses bolts to connect the left and right cylinder heads and the compression ring into one piece, and high-pressure resistant seals are respectively installed between the left cylinder head and the compression ring, and between the right cylinder head and the thrust ring, to ensure that the pipeline medium does not penetrate into the hydraulic cylinder body.

[0033] Further, such as Figures 1 to 3 As shown, the piston rod 131 and the rotating arm 120 of this embodiment are limited in the axial direction by the shaft end nut. In addition, a first axial fixing member 151 is provided between the piston rod 131 and the rotating arm 120, and a pressure plate flange 137 is also provided on the side of the thrust ring away from the rubber cylinder, and a second axial fixing member 152 is provided between the pressure plate flange 137 and the piston rod 131. The first axial fixing member and the second axial fixing member are used to prevent the plug from rotating in the circumferential direction, that is, the rotating arm is fixedly connected to the plug.

[0034] It should be noted that the present embodiment does not specifically limit the types of the first axial fixing member and the second axial fixing member. For example, an axial connection key may be used, that is, a keyway is provided correspondingly, and the axial connection key is provided in the corresponding keyway. Of course, for those skilled in the art, other axial fixing members may also be provided.

[0035] It should be further explained that the front and rear ends of the plug are fixed with locking nuts, which has a simple structure and is easy to disassemble and replace the rubber cartridge.

[0036] It should be noted that the present embodiment does not specifically limit the connection method between the main support and the rotating arm, as long as the rotating arm and the main support can be rotatably connected. Figures 1 to 3 As shown, the main bracket 110 and the rotating arm 120 are fixed by a pin 153 and a screw 154 to realize the rotation of the rotating arm.

[0037] Further, such as Figure 1 As shown in FIG. 4 , in order to ensure that the plug enters the pipeline in the vertical direction without scratching the inner wall of the pipe fittings such as the plugging tee, a steering positioning member 111 is provided on the main bracket 110 in this embodiment. When the plug 130 enters the pipeline 200 in the vertical direction, that is, the plug and the rotating arm are both vertically downward, the included angle between the rotating arm 120 and the main bracket 110 can be adjusted by the steering positioning member 111 (please refer to Figure 4A That is to say, the steering positioning member is arranged on the main bracket, and when the plug enters the pipeline in the vertical direction, the rotating arm will abut against the main bracket and be clamped on the steering positioning member, and the angle between the rotating arm and the main bracket can be adjusted by replacing the steering positioning member so that the rotating arm does not contact the inner wall of the pipeline.

[0038] It should be noted that this embodiment does not specifically limit the steering positioning member. For example, a steering positioning pin is used, which is passed through the main bracket. When the rotating arm is vertically downward and abuts against the main bracket, the steering positioning pin is rotated to adjust the angle between the rotating arm and the main bracket.

[0039] It should be further explained that, in this embodiment, the angle between the rotating arm and the main bracket ranges from 1° to 3°.

[0040] Furthermore, in some other embodiments, Figures 1 to 3 As shown, the device 100 also includes a support ring 160, which is sleeved on the main bracket 110. When the plug is sealed in place in the pipeline and is in a sealed pressure-bearing state, the plug is subjected to the pressure of the medium, and the support ring plays a role of stable support. In addition, when the plug is vertically lowered into the pipeline and extracted from the pipeline, the support ring also plays a guiding role, that is, the angle between the rotating arm and the main bracket is adjusted through the above-mentioned steering positioning member to ensure that the projection of the plug in the vertical direction falls within the support ring.

[0041] Furthermore, combined Figure 1As shown in FIG4 , a guide frame 138 is provided on the side of the piston rod 131 away from the rotating arm 120, and the guide frame is fixed by screws 155. At least one guide wheel is provided on the guide frame 138. After the plug 130 enters the pipeline 200, the guide wheels move in turn in the pipeline 200 and drive the rotating arm 120 to rotate toward the side away from the main bracket 110. That is, when the plug enters the pipeline, the rotating arm rotates counterclockwise around the pin shaft under the action of the guide wheel, driving the plug into the pipeline until the plug is perpendicular to the pipeline, that is, the axes of the two are parallel.

[0042] Specifically, Figure 1 As shown in FIG4 , the guide frame 138 is provided with a first guide wheel 138a along its axial direction, a first wheel shaft 138b is passed through the middle of the first guide wheel, and a second guide wheel 138c is further provided at the bottom of the guide frame 138, a second wheel shaft 138d is passed through the middle of the second guide wheel. When the plug vertically enters the pipeline, the first guide wheel 138a first contacts the bottom wall of the pipeline 200 and moves forward, and then, as the plug 130 continues to enter the pipeline 200, the second guide wheel 138c contacts the bottom wall of the pipeline 200.

[0043] Further, such as Figure 1 As shown in FIG. 4 , a third guide wheel 136a is provided at the bottom of the thrust ring 136, and the third guide wheel 136a is provided on the thrust ring 136 through a support block 136b, and a top block 136c is provided at the top of the thrust ring 136, and the top block 136c is fixed to the thrust ring 136 through a screw 136d. As the plug 130 continues to move forward, the third guide wheel 136a contacts the bottom wall of the pipeline 200 until the axis of the plug 130 is parallel to the axis of the pipeline 200, that is, the plug is sealed in place, and at this time, the main bracket 110 is lowered to abut against the bottom wall of the pipeline 200. Afterwards, the rubber cylinder 132 expands to seal the pipeline 200.

[0044] It should be noted that during the plugging and modification process, when there is high-pressure oil and gas medium in the left pipeline, the top block has an upward component of force. The top block is used to support the pipeline to ensure balanced and stable support of the single-sided pressure state of the plug.

[0045] It should be further explained that the plug of this embodiment is ellipsoidal in shape as a whole, and the outer diameter of the plug is 8% smaller than the inner diameter of the pipe. When entering the pipe, the plug can be smoothly turned and moved into place by its own weight without any obstruction.

[0046] The blocking device of this embodiment is used to pass through the blocking tee and enter the pipeline for blocking, wherein the blocking tee is vertically connected to the pipeline. The blocking device of this embodiment is equivalent to a mechanical steering active blocking device.

[0047] Based on the above structure, FIG. 4A to FIG. 4EAs shown, the plugging process of the plugging device of this embodiment is as follows: the plug 130 is vertically lowered into the pipeline 200, the first guide wheel 138a contacts the bottom wall of the pipeline 200 and starts to move forward, and the rotating arm 120 rotates accordingly in the direction away from the main support 110. At the same time, the main support 110 moves downward, and as the plug 130 moves forward (moves to the right side of the pipeline), the second guide wheel 138c starts to contact the bottom wall of the pipeline 200, and at this time, the second guide wheel 138c and the first guide wheel 138a act on the bottom wall of the pipeline 200 at the same time, and then rely on the second guide wheel 138c to move forward. When the third guide 136a and the second guide wheel 138c contact the bottom wall of the pipeline 200 at the same time, the plug 130 relies on the third guide wheel 136a to move forward until the axis of the plug 130 is parallel to the axis of the pipeline 200, that is, the third guide wheel 136a contacts the bottom wall of the pipeline, and the top block 136c abuts the top wall of the pipeline. At this time, the main support 110 moves to contact the bottom wall of the pipeline 200. It should be understood that in order to prevent the top block from damaging the top wall of the pipeline, generally speaking, there is a spacing of about 5 mm between the top block and the top wall of the pipeline. When the plug is moved into place, two hydraulic oil circuits are introduced through the piston rod 131 to realize oil inlet into the oil inlet chamber, and the cylinder barrel as a whole translates to the right along the piston rod 131, thereby driving the compression ring 135 to compress the rubber cylinder 132, so that the rubber cylinder 132 expands in the circumferential direction, and the outer diameter of the rubber cylinder 132 increases until it is in close contact with the inner wall of the pipeline 200, thereby realizing the sealing and plugging of the pipeline 200. The plugging device is equivalent to a mechanical steering hydraulic sealing and plugging device.

[0048] The present invention provides a pipeline sealing and plugging device, which has the following beneficial effects compared to the prior art: First, a special piston rod and oil-passing hydraulic cylinder structure is used inside the plug of the present invention, which is fixed by the piston rod, and the hydraulic cylinder body moves to make the rubber cylinder expand along its circumference to achieve sealing and plugging of the pipeline. Second, the plugging device of the present invention is provided with at least one guide wheel to make it easier for the plug to enter the interior of the pipeline. Third, a steering positioning member is provided on the main bracket of the present invention, which can adjust the angle between the main bracket and the rotating arm to ensure that the rotating arm does not contact the inner wall of the pipeline. Fourth, the plugging device of the present invention is also provided with a support ring to provide stable support and guidance for the plug.

[0049] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A pipeline sealing and plugging device, characterized in that: include: A main bracket, a rotating arm and a plug, one end of the rotating arm is rotatably connected to the main bracket; a steering positioning piece is provided on the main bracket, when the plug enters the pipeline in the vertical direction, the rotating arm abuts against the main bracket and is clamped on the steering positioning piece, and the angle between the rotating arm and the main bracket is adjusted by rotating or replacing the steering positioning piece so that the rotating arm does not contact the inner wall of the pipeline; the angle between the rotating arm and the main bracket ranges from 1° to 3°; The plug includes a piston rod, a hydraulic cylinder body and a rubber cylinder, a first axial fixing member is arranged between the piston rod and the rotating arm, and the hydraulic cylinder body includes a first cylinder head, a second cylinder head and a compression ring sandwiched between the first cylinder head and the second cylinder head; wherein, The rubber cylinder is arranged on a side of the compression ring away from the first cylinder head, and a thrust ring is fixedly arranged on the side of the rubber cylinder away from the compression ring; When the plug enters the pipeline and the axes of the two are parallel, a hydraulic oil circuit is introduced into the hydraulic cylinder body through the piston rod. The hydraulic oil circuit includes two hydraulic pipes for oil inlet chamber and oil return chamber. When oil is inlet to the oil inlet chamber, the hydraulic cylinder body moves to the right along the piston rod, and the thrust ring is fixed, thereby driving the compression ring to compress the rubber cylinder to the right and expand it along its circumferential direction until it is tightly attached to the inner wall of the pipeline. The direction in which the compression ring compresses the rubber cylinder to the right is the moving direction of the plug; when oil is inlet to the oil return chamber, the hydraulic cylinder body moves to the left along the piston rod, releasing the compression on the rubber cylinder, and the outer diameter of the rubber cylinder is reduced to the initial outer diameter; A guide frame is provided on the side of the piston rod away from the rotating arm, and a first guide wheel is provided along the axial direction of the guide frame. When the plug is vertically lowered into the pipeline, the first guide wheel contacts the bottom wall of the pipeline and starts to move forward; A second guide wheel is also provided at the bottom of the guide frame. As the plug moves forward, the second guide wheel begins to contact the bottom wall of the pipeline. The second guide wheel and the first guide wheel act on the bottom wall of the pipeline at the same time, and then the second guide wheel moves forward. A third guide wheel is arranged at the bottom of the thrust ring. When the third guide wheel and the second guide wheel contact the bottom wall of the pipeline at the same time, the plug moves forward by relying on the third guide wheel until the axis of the plug is parallel to the axis of the pipeline. A top block is arranged on the top of the thrust ring.

2. The device according to claim 1, characterized in that A first seal is disposed between the first cylinder head and the compression ring, and a second seal is disposed between the second cylinder head and the thrust ring.

3. The device according to claim 1, characterized in that A pressure plate flange is also arranged on the side of the thrust ring facing away from the rubber cylinder, and a second axial fixing member is arranged between the pressure plate flange and the piston rod.

4. The device according to any one of claims 1 to 3, characterized in that The device also includes a support ring, which is sleeved on the main support.

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