Pipeline isolation device and pipeline isolation method

Abstract

The invention provides a pipeline isolating device and a pipeline isolating method.The pipeline isolating device comprises a movable base, a rotating arm, a supporting shaft, an isolating mechanism, a pushing mechanism and a front guiding mechanism, the rotating arm is rotatably installed on the movable base, one end of the supporting shaft is installed on the rotating arm, and the other end of the supporting shaft is installed on the front guiding mechanism; the front guide mechanism is installed at the other end of the supporting shaft, and the supporting shaft is sleeved with the isolation mechanism. At least part of the pushing mechanism is installed on the supporting shaft or the rotating arm, the pushing mechanism can move to abut against the end face of the isolation mechanism and extrude the isolation mechanism to expand outwards in the radial direction, and the technical problems that the isolation reliability of blocking and isolation in the oil and gas pipeline is poor, and the number of holes formed in the pipeline is large are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of the operation safety, maintenance and emergency repair of long-distance oil and gas pipelines and oil and gas fields, and particularly relates to a pipeline isolation device and a pipeline isolation method. Background Art

[0002] In the maintenance, emergency repair and transformation technologies of oil and gas fields and long-distance oil and gas pipelines, an in-pipe plugging and isolation device is often used. Its structure mainly places an external loading device inside the pipeline, and passively realizes the medium blockage through a seal to create operating conditions for maintenance, emergency repair and transformation. At present, the in-pipe plugging and isolation device mainly adopts a mechanical passive sealing and isolation form, which has problems such as poor sealing effect, easy leakage, and being easily affected by factors such as impurities and weld beads in the pipeline. Due to poor reliability, in order to ensure the sealing effect, it is usually necessary to open multiple holes in the main pipeline to arrange multiple plugging and isolation devices, resulting in a large number of holes in the main pipeline. Summary of the Invention

[0003] The purpose of the present invention is to provide a pipeline isolation device and a pipeline isolation method to solve the technical problems of poor isolation reliability of in-pipe plugging and isolation of oil and gas pipelines and a large number of pipeline openings.

[0004] The above object of the present invention can be achieved by the following technical solutions:

[0005] The present invention provides a pipeline isolation device, including: a movable seat, a rotating arm, a support shaft, an isolation mechanism, a pushing mechanism and a leading mechanism. The rotating arm is rotatably installed on the movable seat. One end of the support shaft is installed on the rotating arm. The leading mechanism is installed at the other end of the support shaft. The isolation mechanism is sleeved outside the support shaft.

[0006] At least part of the pushing mechanism is installed on the support shaft or the rotating arm. The pushing mechanism can move to abut against the end face of the isolation mechanism and squeeze the isolation mechanism to expand radially outward.

[0007] In a preferred embodiment, the pushing mechanism includes a fixed disk and a movable disk. Both the fixed disk and the movable disk are installed on the support shaft. The isolation mechanism is arranged between the fixed disk and the movable disk. The movable disk can move along the support shaft.

[0008] In a preferred embodiment, the pushing mechanism includes a hydraulic cylinder. The movable part of the hydraulic cylinder is connected to the movable disk.

[0009] In a preferred embodiment, the leading mechanism includes a leading plate arranged at the front end of the fixed disk. The leading plate has a guiding surface, and the guiding surface contracts inward in the direction along the axis of the support shaft forward.

[0010] In a preferred embodiment, a travel recording device is provided on the movable disk.

[0011] In a preferred embodiment, a cleaning device is provided on the outer wall of the fixed disk. The cleaning device includes an arc-shaped cleaning frame and a brush provided on the cleaning frame.

[0012] In a preferred embodiment, the isolation mechanism includes an isolation ring and isolation seals provided on both sides of the isolation ring.

[0013] In a preferred embodiment, the pipeline isolation device includes a claw mechanism. The claw mechanism includes a clamping ring and a ring claw; a connection hole is provided on the rotating arm, and an annular groove is provided on the outer wall of the support shaft. The support shaft is inserted into the connection hole, and the clamping ring is provided in the annular groove and its end face abuts against the rotating arm. The ring claw is sleeved outside the support shaft and fixed to the other end face of the clamping ring.

[0014] In a preferred embodiment, a first baffle and a second baffle are provided on the outer wall of the movable seat. The first baffle and the second baffle are distributed oppositely; a support portion for abutting against the inner wall of the pipeline is provided at the front end of the movable seat.

[0015] The present invention provides a pipeline isolation method, which adopts the above pipeline isolation device. The pipeline isolation method includes:

[0016] Step S10, opening a hole in the side wall of the pipeline to be isolated;

[0017] Step S20, inserting the pipeline isolation device into the pipeline to be isolated from the hole;

[0018] Step S30, continuously pushing the pipeline isolation device so that the movable seat abuts against the inner wall of the pipeline to be isolated, and the rotating arm rotates relative to the movable seat;

[0019] Step S40, rotating the rotating arm until the support shaft is in the same direction as the axis of the pipeline to be isolated;

[0020] Step S50, moving the pushing mechanism to abut against the end face of the isolation mechanism and squeezing the isolation mechanism to expand radially outward to be in sealing fit with the inner wall of the pipeline to be isolated.

[0021] The features and advantages of the present invention are:

[0022] The pipeline isolation device can be extended into the pipeline to be isolated through the opening on the side wall of the pipeline to be isolated, and the pipeline isolation device is pushed forward until the leading mechanism abuts against the inner wall of the pipeline to be isolated; the device continues to be pushed forward, and under the guidance of the leading mechanism, the rotating arm rotates relative to the movable seat, and drives the support shaft to rotate in the same direction as the axial direction of the pipeline to be isolated; then, the pushing mechanism is controlled to squeeze the isolation mechanism, and the isolation mechanism is compressed and deformed and expands outward to seal and contact with the side wall of the pipeline to be isolated, so as to achieve the isolation operation. When the isolation needs to be released, the pushing mechanism is controlled to move in a direction away from the isolation mechanism, and the isolation mechanism contracts under the action of elasticity, and the sealing contact with the side wall of the pipeline to be isolated is released.

[0023] The pushing mechanism applies a thrust to the isolation mechanism, causing the isolation mechanism to expand radially to achieve sealed isolation, which is beneficial to ensuring the sealing degree of the contact between the isolation mechanism and the inner wall of the pipe to be isolated; and, as the medium, pressure, impurities, welds, etc. in the pipe to be isolated vary, the thrust of the pushing mechanism is adjusted, thereby adjusting the deformation of the isolation mechanism, which can ensure a good blocking isolation effect and improve the reliability of blocking isolation, thereby eliminating the need to open secondary isolation holes on the pipe to be isolated due to poor isolation effects, reducing the number of holes in the pipe to be isolated and reducing operating cost investment; at the same time, environmental pollution problems caused by sealing leakage and emissions are avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic diagram of the working state of the pipeline isolation device provided by the present invention;

[0026] Figure 2 A schematic diagram of the operation of the pipeline isolation device provided by the present invention in an isolation state;

[0027] Figure 3 A schematic diagram of the operation of the pipeline isolation device provided by the present invention in the lowered state;

[0028] Figure 4 A schematic diagram of the structure of the pipeline isolation device provided by the present invention;

[0029] Figure 5 A schematic diagram of the structure of a cleaning device in a pipeline isolation device provided by the present invention;

[0030] Figure 6Schematic connection diagram of the rotating arm, support shaft and claw mechanism in the pipeline isolation device provided by the present invention;

[0031] Figure 7 Schematic structural diagram of the claw mechanism in the pipeline isolation device provided by the present invention;

[0032] Figure 8 Schematic structural diagram of the isolation mechanism in the pipeline isolation device provided by the present invention;

[0033] Figure 9 Schematic diagram of the pipeline isolation method provided by the present invention.

[0034] Explanation of the reference numerals in the drawings:

[0035] 1. Clad tee; 2. Pipeline to be isolated;

[0036] 300. Pushing mechanism;

[0037] 30. Movable disk; 31. Hydraulic cylinder;

[0038] 3. One-way shaft;

[0039] 4. Movable seat; 41. First baffle; 42. Second baffle; 43. Support part;

[0040] 5. Rotating arm; 51. Connecting hole;

[0041] 6. Claw mechanism; 22. Snap ring; 23. Ring claw; 24. First screw;

[0042] 7. Support shaft; 71. Annular groove; 72. Annular protrusion;

[0043] 8. Housing;

[0044] 9. Fixed disk;

[0045] 100. Leading mechanism;

[0046] 10. Leading plate; 101. Guide surface;

[0047] 11. Isolation mechanism; 28. Isolation seal; 29. Isolation ring;

[0048] 12. Stroke recording device;

[0049] 13. Valve; 14. Coupling device;

[0050] 15. Bourdon tube group; 16. Power device;

[0051] 17. Data line group; 18. Display module;

[0052] 19. cleaning device; 25. sweeping brush; 26. cleaning frame; 27. second screw;

[0053] 20. Occluder. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] Solution 1

[0056] The present invention provides a pipeline isolation device, such as Figures 1 - 4 As shown, it includes: a movable seat 4, a rotating arm 5, a support shaft 7, an isolation mechanism 11, a pushing mechanism 300 and a leading mechanism 100, the rotating arm 5 is rotatably mounted on the movable seat 4, one end of the support shaft 7 is mounted on the rotating arm 5, the leading mechanism 100 is mounted on the other end of the support shaft 7, and the isolation mechanism 11 is sleeved outside the support shaft 7; the pushing mechanism 300 is at least partially mounted on the support shaft 7 or the rotating arm 5, and the pushing mechanism 300 can move to abut against the end face of the isolation mechanism 11 and squeeze the isolation mechanism 11 to expand radially outward.

[0057] Through the opening on the side wall of the pipe 2 to be isolated, the pipe isolation device can be extended into the pipe 2 to be isolated, and the pipe isolation device is pushed forward until the leading mechanism 100 abuts against the inner wall of the pipe 2 to be isolated; the device is pushed forward, and under the guidance of the leading mechanism 100, the rotating arm 5 rotates relative to the movable seat 4, and drives the support shaft 7 to rotate to the same direction as the axial direction of the pipe 2 to be isolated; then, the pushing mechanism 300 is controlled to squeeze the isolation mechanism 11, and the isolation mechanism 11 is compressed and deformed and expands outward to seal the side wall of the pipe 2 to be isolated, so as to achieve the isolation operation. When the isolation needs to be released, the pushing mechanism 300 is controlled to move in a direction away from the isolation mechanism 11, and the isolation mechanism 11 contracts under the action of elasticity, and the sealing contact with the side wall of the pipe 2 to be isolated is released.

[0058] The driving mechanism 300 applies a thrust to the isolation mechanism 11, causing the isolation mechanism 11 to expand radially to achieve sealed isolation, which is beneficial to ensuring the sealing degree of the contact and fit between the isolation mechanism 11 and the inner wall of the pipeline 2 to be isolated. Moreover, as the medium, pressure, impurities, weld beads, etc. in the pipeline 2 to be isolated vary, by adjusting the thrust magnitude of the driving mechanism 300, the deformation amount of the isolation mechanism 11 can be adjusted, which can ensure a good blocking and isolation effect, improve the reliability of the blocking and isolation, so that there is no need to open secondary isolation holes on the pipeline 2 to be isolated due to poor isolation effect, reducing the number of openings of the pipeline 2 to be isolated and reducing the input of operation costs. At the same time, it avoids environmental pollution problems caused by seal leakage and emissions.

[0059] In some embodiments, the driving mechanism 300 includes a fixed disk 9 and a movable disk 30. Both the fixed disk 9 and the movable disk 30 are installed on the support shaft 7. The isolation mechanism 11 is arranged between the fixed disk 9 and the movable disk 30. The movable disk 30 can move along the support shaft 7, and the isolation mechanism 11 is squeezed by moving the movable disk 30 towards the fixed disk 9. By controlling the displacement amount of the movable disk 30 moving relative to the fixed disk 9, the thrust magnitude of the driving mechanism 300 on the isolation mechanism 11 is adjusted, thereby adjusting the deformation amount of the isolation mechanism 11.

[0060] The power for the movement of the movable disk 30 can be electrically driven or hydraulically driven.

[0061] Preferably, the power for the movement of the movable disk 30 is hydraulically driven. As Figure 2 and Figure 4 shown, the driving mechanism 300 includes a hydraulic cylinder 31. The movable part of the hydraulic cylinder 31 is connected to the movable disk 30. By injecting pressure fluid into the hydraulic cylinder 31, the movable part of the hydraulic cylinder 31 can be driven to move, and the movable disk 30 is driven to move together. Specifically, as Figure 4 and Figure 6 shown, an annular protrusion 72 is arranged outside the support shaft 7. A housing 8 is hermetically connected outside the annular protrusion 72. A hydraulic cavity (not shown in the figure) is formed by enclosing between the outer wall of the support shaft 7, the housing 8 and the end face of the annular protrusion 72, thus forming the hydraulic cylinder 31. The housing 8 and the movable disk 30 serve as the movable part of the hydraulic cylinder 31. The support shaft 7 is provided with an oil through hole (not shown in the figure), and the oil through hole is communicated with the hydraulic cavity. The oil through hole is connected to a spring tube group 15. The spring tube group 15 extends to the outside of the pipe of this pipe isolation device through the through hole of the movable seat 4 and is connected to the power device 16. The power device 16 includes an oil pump, and pressure fluid can be delivered to the hydraulic cylinder 31 through the spring tube group 15.

[0062] Taking the direction in which this pipe isolation device extends into the pipeline 2 to be isolated to define the front-back direction. Figure 2For example, the front - rear direction of the support shaft 7 is defined as follows: the direction along the axial direction of the support shaft 7 pointing to the end far from the movable seat 4 is forward, and the direction along the axial direction of the support shaft 7 pointing to the end close to the movable seat 4 is backward; the front - rear direction of the movable seat 4 is defined as follows: the direction along the longitudinal direction of the movable seat 4 pointing to the end close to the support shaft 7 is forward, and the direction along the longitudinal direction of the movable seat 4 pointing to the end far from the support shaft 7 is backward.

[0063] In one embodiment, the leading mechanism 100 includes a leading plate 10 disposed at the front end of the fixed disk 9. The leading plate 10 has a guiding surface 101, and the guiding surface 101 contracts inward in the forward direction along the axial direction of the support shaft 7. As Figure 1 shown, during the process of pushing forward, the guiding surface 101 of the leading plate 10 abuts against the inner wall of the pipeline 2 to be isolated. The guiding surface 101 plays a guiding role. When continuing to push forward, the guiding surface 101 moves along the inner wall of the pipeline 2 to be isolated, causing the leading plate 10 and the fixed disk 9, support shaft 7, and rotating arm 5 directly or indirectly connected to the leading plate 10 to rotate, so as to achieve steering. In addition to the leading plate 10, the leading mechanism 100 can also adopt other structural forms, such as a cylinder or a sphere having a guiding surface 101, etc.

[0064] In one embodiment, the movable disk 30 is provided with a stroke recording device 12. The stroke recording device 12 is used to measure and record the moving stroke of the movable disk 30 on the support shaft 7, so as to obtain the deformation amount of the isolation mechanism 11, in order to understand the sealing condition between the isolation mechanism 11 and the inner wall of the pipeline 2 to be isolated. A reference position can be set on the support shaft 7 or the rotating arm 5, and the distance between the position of the stroke recording device 12 and this reference position is denoted as the moving stroke value of the movable disk 30. Specifically, the stroke recording device 12 includes a range rod. The range rod can be fixed to the movable disk 30, support shaft 7, or rotating arm 5. The stroke recording device 12 is connected to an external display module 18 through a data line group 17. The stroke recording device 12 and the display module 18 make the deformation amount of the isolation mechanism 11 visible, improving the safety and reliability of the operation.

[0065] In one embodiment, a cleaning device 19 is provided on the outer wall of the fixed disk 9. The cleaning device 19 includes an arc - shaped cleaning frame 26 and a brush 25 disposed on the cleaning frame 26. During the process of the pipeline isolation device sliding and walking in the pipeline 2 to be isolated, the brush 25 can clean the impurities in the pipeline to avoid the impurities affecting the sealing fit between the isolation mechanism 11 and the inner wall of the pipeline, which is beneficial to establishing good sealing and isolation conditions. As Figure 5As shown, the cleaning frame 26 is arc-shaped, which is beneficial for the brush 25 to fit the inner wall of the pipeline 2 to be isolated. The cleaning device 19 is preferably arranged on the front side of the isolation mechanism 11. Specifically, a sink and screw holes are provided on the cleaning frame 26, and the brush 25 is installed in the sink of the cleaning frame 26; the fixed disk 9 and the cleaning device 19 are connected by the second screw 27.

[0066] The isolation mechanism 11 can adopt an elastic seal, such as a rubber ring, etc. In an embodiment, as Figure 8 shown, the isolation mechanism 11 includes an isolation ring 29 and isolation seals 28 arranged on both sides of the isolation ring 29. After being squeezed, the isolation seals 28 on both sides are deformed respectively and expand outwards to be in sealing cooperation with the inner wall of the pipeline 2 to be isolated, forming a double-layer seal, which improves the sealing and isolation effect. The isolation seal 28 can adopt a rubber ring.

[0067] The isolation ring 29 and the isolation seal 28 can be sleeved outside the housing 8. As Figure 4 shown, the cross-sectional shape of the fixed disk 9 is U-shaped, and the opening of the U-shaped faces the isolation mechanism 11. The isolation mechanism 11 abuts against the end face of the fixed disk 9, and the housing 8 can move into the fixed disk 9. The distance between the end face of the housing 8 and the bottom of the U-shaped groove of the fixed disk 9 is the movable range of the housing 8.

[0068] In an embodiment, the pipeline isolation device includes a claw mechanism 6. As Figure 7 shown, the claw mechanism 6 includes a retaining ring 22 and a ring claw 23; as Figure 6 shown, the rotating arm 5 is provided with a connection hole 51, and the outer wall of the support shaft 7 is provided with an annular groove 71. The support shaft 7 is inserted into the connection hole 51, and the retaining ring 22 is arranged in the annular groove 71 and its end face abuts against the rotating arm 5. The ring claw 23 is sleeved outside the support shaft 7 and fixed to the other end face of the retaining ring 22, thereby locking the support shaft 7 in the connection hole 51 of the rotating arm 5, realizing the locking between the rotating arm 5 and the support shaft 7, facilitating assembly and ensuring the firmness of the connection. As Figure 7 shown, the retaining ring 22 can be formed by splicing a plurality of semi-circular blocks, and the ring claw 23 and the retaining ring 22 are connected by the first screw 24.

[0069] In an embodiment, the fixed disk 9 is provided with a through hole, and the support shaft 7 passes through the through hole. The support shaft 7 is fixed in the through hole of the fixed disk 9. Specifically, an annular groove 71 can also be provided at one end of the support shaft 7 connected to the fixed disk 9, and the support shaft 7 can also be locked in the through hole of the fixed disk 9 by arranging the claw mechanism 6 in the annular groove 71, realizing the locking between the fixed disk 9 and the support shaft 7.

[0070] As Figure 6As shown, the connection hole 51 on the rotating arm 5 is arranged along the axial direction of the support shaft 7, and the connection hole 51 is perpendicular to the rotation axis of the rotating arm 5.

[0071] As Figure 4 shown, the movable seat 4 is provided with a first rotating through hole (not shown in the figure) perpendicular to its longitudinal direction and a through hole (not shown in the figure) parallel to its longitudinal direction; the rotating arm 5 is provided with a second rotating through hole (not shown in the figure); the single-slot shaft 3 passes through the first rotating through hole of the movable seat 4 and the second rotating through hole of the rotating arm 5 to connect the two, and the single-slot shaft 3 serves as the rotation axis of the rotating arm 5; the through hole parallel to the longitudinal direction of the movable seat 4 can be used to arrange electrical pipelines such as the spring tube group 15 and the data line group 17.

[0072] In an embodiment, the outer wall of the movable seat 4 is provided with a first baffle 41 and a second baffle 42, and the first baffle 41 and the second baffle 42 are distributed oppositely; the front end of the movable seat 4 is provided with a support portion 43 for abutting against the inner wall of the pipeline. The opening on the side wall of the pipeline 2 to be isolated is connected with the wrapping tee 1, and this pipeline isolation device can move into the pipeline 2 to be isolated through the wrapping tee 1, as Figure 2 and Figure 4 shown, the first baffle 41 and the second baffle 42 are respectively in contact with the inner wall of the wrapping tee 1, and there is a gap between the outer wall of the movable seat 4 and the inner wall of the wrapping tee 1, reducing the contact area between the movable seat 4 and the inner wall of the wrapping tee 1. At the same time, under the combined action of the first baffle 41 and the second baffle 42, it is ensured that the movable seat 4 moves smoothly along the wrapping tee 1; moreover, when the movable seat 4 is pushed forward until the support portion 43 abuts against the inner wall of the pipeline, the first baffle 41 and the second baffle 42 are respectively in contact with the inner wall of the wrapping tee 1, so that the movable seat 4 is kept stable under the cooperative support of the support portion 43, the first baffle 41 and the second baffle 42, and further the support shaft 7 is kept stable to ensure the reliability of the sealing isolation. Preferably, as Figure 2 and Figure 4 shown, the longitudinal positions of the first baffle 41 and the second baffle 42 on the movable seat 4 are staggered. Preferably, the rotating arm 5 can be a double-link arm; the movable seat 4 can adopt a Y-shaped plate. In the left view of Figure 4 , the upper part of the support portion 43 is bifurcated, making the movable seat 4 in a Y shape.

[0073] In an embodiment, the lowering process of the pipeline isolation device provided by the present invention includes:

[0074] (1) The opening on the side wall of the pipeline 2 to be isolated is connected with the wrapping tee 1, and the wrapping tee 1 is connected to the combining device 14 through the valve 13, as Figure 3As shown, the coupling device 14 is tubular and can be connected to the encapsulated tee 1 through the valve 13. The coupling device 14 provides a passage for the pipe isolation device to move towards the opening on the side wall of the pipe 2 to be isolated and plays a guiding role; the pipe isolation device provided by the present invention is installed at the end of the plugging device 20;

[0075] (2) Lower the pipe isolation device through the plugging device 20. As Figure 1 and Figure 3 shown, at this time, the longitudinal direction of the movable seat 4 is perpendicular to the pipe 2 to be isolated until the leading mechanism 100 contacts the bottom of the inner wall of the pipe 2 to be isolated; then the rotating arm 5 rotates around the cross shaft 3 relative to the movable seat 4 and slides along the inner wall of the pipe 2 to be isolated to the isolation position;

[0076] (3) Start the external power device 16, and through the spring tube group 15, make the movable disk 30 act. The movable disk 30 slides forward towards the leading mechanism 100, pushing the isolation mechanism 11 to compress and deform until the isolation mechanism 11 forms a seal with the inner wall of the pipe 2 to be isolated;

[0077] (4) According to the medium in the pipe 2 to be isolated, the form and size of the weld bead, and the isolation and blocking effect, the deformation amount of the isolation mechanism 11 can be adjusted through the power device 16 to form a self-starting isolation and blocking mode;

[0078] (5) When the operation is completed and isolation needs to be released, also start the external power device 16, and through the spring tube group 15, make the movable disk 30 slide in the direction away from the leading mechanism 100 to release the compression of the isolation mechanism 11;

[0079] (6) The data of the stroke recording device 12 is displayed on the display module 18 through the data line; the data on the display module 18 is recorded when the movable disk 30 does not act, and the data on the display module 18 is recorded when the isolation and sealing state is achieved.

[0080] Through the present invention, the problems existing in the long-distance oil and gas transportation and the operation safety and maintenance and emergency repair construction operations of oil and gas fields, such as easy leakage during blocking, a large number of openings in the pipe 2 to be isolated, and the influence of impurities and weld beads in the pipe on the isolation effect, are solved, the operation safety and reliability are improved, the cost investment is reduced, and the impact on the environment is reduced.

[0081] Solution Two

[0082] The present invention provides a pipe isolation method, which uses the above-mentioned pipe isolation device. As Figure 9 shown, the pipe isolation method includes:

[0083] Step S10, open a hole in the side wall of the pipe 2 to be isolated;

[0084] Step S20, insert the pipe isolation device into the pipe 2 to be isolated from the opening;

[0085] Step S30: Continuously push the pipeline isolation device so that the movable seat 4 abuts against the inner wall of the pipeline 2 to be isolated, and the rotating arm 5 rotates relative to the movable seat 4.

[0086] Step S40: Rotate the rotating arm 5 until the support shaft 7 is in the same axial direction as the pipeline 2 to be isolated.

[0087] Step S50: Move the pushing mechanism 300 to abut against the end face of the isolation mechanism 11 and squeeze the isolation mechanism 11 to expand radially outward to be in sealing fit with the inner wall of the pipeline 2 to be isolated.

[0088] This pipeline isolation method has all or at least some of the features and technical effects of the above pipeline isolation device, which will not be elaborated here.

[0089] Furthermore, step S10 includes: First, fix the cladding tee 1 outside the pipeline 2 to be isolated, and then lower the drilling mechanism to open a hole in the side wall of the pipeline 2 to be isolated; the cladding tee 1 is connected to the combining device 14 through the valve 13. During the operation, when the pipeline isolation device is not lowered, the valve 13 can be closed to seal the hole. The pipeline isolation device is installed at the end of the plug 20. In steps S20 and S30, the pipeline isolation device is lowered and pushed into the pipeline 2 to be isolated through the plug 20.

[0090] The above are only several embodiments of the present invention. Those skilled in the art can make various changes or modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention based on the content disclosed in the application documents.

Claims

1. A pipeline isolation device, characterized in that, it includes: a movable seat, a rotating arm, a support shaft, an isolation mechanism, a pushing mechanism and a leading mechanism. The rotating arm is rotatably installed on the movable seat. One end of the support shaft is installed on the rotating arm. The leading mechanism is installed at the other end of the support shaft. The isolation mechanism is sleeved outside the support shaft; at least part of the pushing mechanism is installed on the support shaft or the rotating arm. The pushing mechanism can move to abut against the end face of the isolation mechanism and squeeze the isolation mechanism to expand radially outwards.

2. The pipeline isolation device according to claim 1, characterized in that, the pushing mechanism includes a fixed disk and a movable disk. Both the fixed disk and the movable disk are installed on the support shaft. The isolation mechanism is arranged between the fixed disk and the movable disk. The movable disk can move along the support shaft.

3. The pipeline isolation device according to claim 2, characterized in that, the pushing mechanism includes a hydraulic cylinder. The movable part of the hydraulic cylinder is connected to the movable disk.

4. The pipeline isolation device according to claim 2, characterized in that, the leading mechanism includes a leading plate arranged at the front end of the fixed disk. The leading plate has a guiding surface. The guiding surface contracts inwards along the axial direction of the support shaft towards the front.

5. The pipeline isolation device according to claim 2, characterized in that, the movable disk is provided with a stroke recording device.

6. The pipeline isolation device according to claim 2, characterized in that, a cleaning device is arranged on the outer wall of the fixed disk. The cleaning device includes an arc-shaped cleaning frame and a brush arranged on the cleaning frame.

7. The pipeline isolation device according to claim 1, characterized in that, the isolation mechanism includes an isolation ring and isolation seals arranged on both sides of the isolation ring.

8. The pipeline isolation device according to claim 1, characterized in that, the pipeline isolation device includes a claw mechanism. The claw mechanism includes a retaining ring and a ring claw; the rotating arm is provided with a connecting hole, a circular groove is arranged on the outer wall of the support shaft. The support shaft is inserted into the connecting hole. And the retaining ring is arranged in the circular groove and its end face abuts against the rotating arm. The ring claw is sleeved outside the support shaft and is fixedly connected to the other end face of the retaining ring.

9. The pipeline isolation device according to claim 1, characterized in that, a first baffle and a second baffle are arranged on the outer wall of the movable seat. The first baffle and the second baffle are distributed oppositely; a support part for abutting against the inner wall of the pipeline is arranged at the front end of the movable seat.

10. A pipeline isolation method, characterized in that, using the pipeline isolation device according to any one of claims 1-9, the pipeline isolation method includes: Step S10, opening a hole in the side wall of the pipeline to be isolated; Step S20, inserting the pipeline isolation device into the pipeline to be isolated through the hole; Step S30, continuously pushing the pipeline isolation device so that the movable seat abuts against the inner wall of the pipeline to be isolated, and the rotating arm rotates relative to the movable seat; Step S40, rotate the rotating arm until the support shaft is in the same axial direction as the pipeline to be isolated; Step S50, move the pushing mechanism to abut against the end face of the isolation mechanism and squeeze the isolation mechanism to expand radially outward to be sealingly fitted with the inner wall of the pipeline to be isolated.

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