Flexible pipe clamping device, mounting system and mounting method thereof

Abstract

The invention provides a flexible pipe clamping device, an installation system and an installation method of the flexible pipe clamping device, and relates to the technical field of oil exploitation equipment.The flexible pipe clamping device comprises an installation cylinder, a protection pipe, a keeping piece, a cam and a driving assembly.The protection pipe is arranged in the installation cylinder and used for allowing a flexible pipe to penetrate through, and the keeping piece is arranged on the protection pipe; the retaining part is arranged on the outer side of the protection tube, the cam is arranged on the side, away from the protection tube, of the retaining part, the retaining part and the cam make contact with each other, the retaining part is movably installed on the installation cylinder in the radial direction of the installation cylinder, the cam is rotatably installed on the installation cylinder, and the cam is arranged on the outer side of the protection tube. And the driving assembly is in driving connection with the cam and is used for driving the cam to rotate so as to drive the retaining piece to move in the radial direction of the mounting cylinder, so that the deformation quantity of the protection pipe is changed, and the clamping force on the flexible pipe is adjusted. The safety risk in the process of installing the flexible pipe into the oil well can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of oil production equipment, and in particular to a flexible pipe clamping device, an installation system and an installation method thereof. Background Art

[0002] With the continuous development and technological progress of oil extraction technology, traditional steel pipelines have gradually shown their limitations, especially in terms of corrosion resistance. As a new type of pipe material, fiber-reinforced thermal insulation composite flexible pipe has the advantage of corrosion resistance. Therefore, people are increasingly inclined to use it to replace steel pipes as oil pipelines.

[0003] However, in the related art, fiber-reinforced insulated composite flexible pipes usually need to be transported into the oil wellhead to achieve the installation of the oil pipeline. However, the flexible pipes are prone to excessive speed during the process of descending along the oil well, which may cause collision with the well wall or other underground structures, causing safety risks. Summary of the invention

[0004] The problem solved by the invention is: how to reduce the safety risk during the installation of the flexible pipe into the oil well.

[0005] In order to solve the above problems, the present invention provides a flexible pipe clamping device, an installation system and an installation method thereof.

[0006] In the first aspect, the present invention provides a flexible tube clamping device, including a mounting tube, a protective tube, a retaining member, a cam and a driving assembly, wherein the protective tube is arranged in the mounting tube, the protective tube is used for the flexible tube to pass through, the retaining member is arranged on the outside of the protective tube, the cam is arranged on the side of the retaining member away from the protective tube, the retaining member and the cam are in contact with each other, the retaining member is movably mounted on the mounting tube along the radial direction of the mounting tube, the cam is rotatably mounted on the mounting tube, and the driving assembly is drivingly connected to the cam for driving the cam to rotate so as to drive the retaining member to move along the radial direction of the mounting tube, so that the deformation of the protective tube changes to adjust the clamping force on the flexible tube.

[0007] The beneficial effects of the flexible tube clamping device of the present invention are as follows: by arranging the protective tube in the installation tube, the protective tube can be passed through by the flexible tube, the retaining member is arranged on the outer side of the protective tube, and the retaining member is movably installed on the installation tube along the radial direction of the installation tube, so that when the retaining member moves along the radial direction of the installation tube, the degree of compression of the protective tube by the retaining member will change accordingly, thereby changing the deformation amount, so as to shrink inwardly or relax outwardly, thereby being able to change its clamping force on the flexible tube; and, by arranging the cam on the side of the retaining member away from the protective tube and in contact with the retaining member, the cam can be rotated The flexible pipe is movably installed on the mounting tube, and the driving assembly is connected to the cam driving, so that the driving assembly can drive the cam to rotate, and then the rotating cam drives the retaining member to move along the radial direction of the mounting tube. In this way, when the speed of the flexible pipe is too fast during the process of descending along the oil well, the driving assembly can drive the cam to rotate to drive the retaining member to move close to the flexible pipe along the radial direction of the mounting tube, so that the protective tube contracts inwardly to increase the clamping force on the flexible pipe, thereby slowing down the descending speed of the flexible pipe, avoiding the flexible pipe from descending too fast and colliding with the well wall or other underground structures, thereby reducing safety risks.

[0008] Optionally, the retaining member comprises a retaining plate extending along the axial direction of the mounting tube, and an inner wall surface of the retaining plate is configured as a curved surface that matches the shape of an outer wall surface of the protection tube.

[0009] Optionally, the axial direction of the cam is parallel to the axial direction of the mounting tube, the axial length of the cam along the mounting tube is equal to the axial length of the retaining plate along the mounting tube, and the length of the contact line between the outer wall surface of the cam and the outer wall surface of the retaining plate is equal to the axial length of the retaining plate along the mounting tube.

[0010] Optionally, a mounting hole is provided on the wall of the mounting cylinder and penetrates radially along the mounting cylinder, and the retaining member further comprises a boss protruding from the outer side of the retaining plate along the radial direction of the mounting cylinder, and the boss is inserted into the mounting hole and is movably arranged along the radial direction of the mounting cylinder relative to the mounting hole.

[0011] Optionally, the retaining member is provided with two bosses, which are respectively located at the two ends of the retaining plate along the axial direction of the mounting cylinder, and the mounting holes are respectively provided at the two ends of the cylinder wall of the mounting cylinder along the axial direction, and the two bosses are respectively inserted into the two mounting holes.

[0012] Optionally, there are a plurality of retaining members, and the plurality of retaining members are evenly spaced and arranged along the circumference of the protection tube. There are a plurality of cams, and the plurality of cams are respectively in contact with the plurality of retaining members.

[0013] Optionally, the drive assembly includes multiple first gears, a transmission ring, a second gear, a third gear, a worm wheel, a worm and a motor. The multiple first gears are coaxially connected to the multiple cams respectively. The transmission ring is rotatably disposed on the mounting tube and its axial direction coincides with the axial direction of the mounting tube. The inner circumference of the transmission ring is provided with an inner gear ring meshing with the multiple first gears, and the outer circumference of the transmission ring is provided with an outer gear ring. The second gear is meshed with the outer gear ring, the third gear is meshed with the second gear, the worm wheel is coaxially connected with the third gear, the worm is meshed with the worm wheel, and the motor is drivingly connected to the worm.

[0014] Optionally, it also includes a reducer, an adjustable friction clutch and a brake connected in sequence, the reducer is connected to the worm, and the motor is connected to the brake.

[0015] In a second aspect, the present invention provides a flexible pipe installation system, comprising a coiler, a flexible pipe guide device and the flexible pipe clamping device as described above, wherein the coiler, the flexible pipe guide device and the flexible pipe clamping device are arranged in sequence along the conveying direction of the flexible pipe.

[0016] In a third aspect, the present invention provides a flexible pipe installation method. Based on the flexible pipe installation system as described above, the flexible pipe installation method comprises: Passing a flexible pipe through a protective pipe, with the lower end of the flexible pipe passing through the protective pipe and extending into the wellhead; Open the adjustable friction clutch; The brake is closed, and the motor is started again. The motor drives the cam to rotate through the transmission mechanism, and then drives the retaining member to move along the radial direction of the mounting tube, so that the deformation of the protection tube changes and the clamping force on the flexible tube is adjusted; When the speed at which the flexible pipe descends along the wellhead reaches a preset value, the motor is turned off and the brake is turned on.

[0017] The beneficial effects of the flexible pipe installation method of the present invention are: first, the flexible pipe is passed through the protective pipe, and the lower end of the flexible pipe passes through the protective pipe and extends into the wellhead to realize the installation of the flexible pipe in the flexible pipe clamping device, then the adjustable friction clutch is opened to ensure that the motor can transmit torque to the cam, and then the brake is closed, and the motor is started again to use the motor drive to adjust the clamping force on the flexible pipe, and finally when the speed at which the flexible pipe descends along the wellhead reaches a preset value, the motor is closed and the brake is opened again to fix the clamping force on the flexible pipe at the adjusted value, so that the flexible pipe can be at the required descending speed, avoiding the flexible pipe from descending too fast and colliding with the well wall or other underground structures, thereby reducing safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of a flexible pipe clamping device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the flexible pipe clamping device after removing the installation tube according to an embodiment of the present invention; Figure 3 It is a schematic structural diagram of the installation tube of the flexible pipe clamping device according to an embodiment of the present invention; Figure 4 It is a partial schematic diagram of a flexible pipe clamping device according to an embodiment of the present invention; Figure 5 A top view of the mounting tube of the flexible pipe clamping device according to an embodiment of the present invention; Figure 6 It is a schematic diagram of the connection of the driving assembly of the flexible pipe clamping device according to an embodiment of the present invention; Figure 7 It is a schematic structural diagram of a flexible pipe installation system according to an embodiment of the present invention.

[0019] Description of reference numerals: 1. Mounting cylinder; 11. Mounting hole; 2. Protective tube; 3. Retaining piece; 31. Retaining plate; 32. Boss; 4. Cam; 5. Flexible tube; 61. First gear; 62. Transmission ring; 621. Inner gear ring; 622. Outer gear ring; 63. Second gear; 64. Third gear; 65. Worm gear; 66. Worm; 67. Motor; 68. Reducer; 69. Adjustable friction clutch; 70. Brake; 100. Flexible tube clamping device; 200. Coiler; 300. Flexible tube guide device. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0021] The Z axis in the drawings represents the vertical direction, that is, the up and down position, and the positive direction of the Z axis represents the top, and the reverse direction of the Z axis represents the bottom; the X axis in the drawings represents the horizontal direction, and is designated as the front and back position, and the positive direction of the X axis represents the front side, and the reverse direction of the X axis represents the back side; the Y axis in the drawings represents the left and right position, and the positive direction of the Y axis represents the left side, and the reverse direction of the Y axis represents the right side. It should also be noted that the aforementioned Z axis, Y axis, and X axis are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0023] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0024] The present invention provides a flexible pipe clamping device, an installation system and an installation method thereof, so as to reduce the safety risk during the installation of the flexible pipe into an oil well.

[0025] like Figure 1 As shown, a flexible tube clamping device provided by the present invention includes a mounting tube 1, a protective tube 2, a retaining member 3, a cam 4 and a driving assembly, wherein the protective tube 2 is arranged in the mounting tube 1, the protective tube 2 is used for the flexible tube 5 to pass through, the retaining member 3 is arranged on the outer side of the protective tube 2, the cam 4 is arranged on the side of the retaining member 3 away from the protective tube 2, the retaining member 3 and the cam 4 are in contact with each other, the retaining member 3 is movably mounted on the mounting tube 1 along the radial direction of the mounting tube 1, the cam 4 is rotatably mounted on the mounting tube 1, and the driving assembly is drivingly connected to the cam 4, and is used to drive the cam 4 to rotate, so as to drive the retaining member 3 to move along the radial direction of the mounting tube 1, so that the deformation of the protective tube 2 changes to adjust the clamping force on the flexible tube 5.

[0026] It should be noted that the flexible tube 5 can be a fiber-reinforced heat-insulating composite flexible tube 5. Specifically, the material of the protective tube 2 can be a rubber material, so that it can be deformed under the extrusion of the retainer 3 and better protect the flexible tube 5. In addition, in order to prevent the protective tube 2 from falling out of the installation tube 1, an annular baffle for stopping the protective tube 2 can be provided at the lower opening of the installation tube 1. It can be understood that when the retainer 3 moves along the radial direction of the installation tube 1, the degree of extrusion of the protective tube 2 by the retainer 3 will change accordingly, so that the protective tube 2 as a whole will shrink inward or relax outward, thereby being able to change its clamping force on the flexible tube 5.

[0027] In this embodiment, the protective tube 2 is arranged in the installation tube 1, the protective tube 2 can be passed through by the flexible tube 5, the retaining member 3 is arranged on the outside of the protective tube 2, and the retaining member 3 is movably installed on the installation tube 1 along the radial direction of the installation tube 1, so that when the retaining member 3 moves along the radial direction of the installation tube 1, the degree of compression of the protective tube 2 by the retaining member 3 will change accordingly, thereby changing the deformation amount, so as to shrink inward or relax outward, thereby being able to change its clamping force on the flexible tube 5; and, by arranging the cam 4 on the side of the retaining member 3 away from the protective tube 2 and in contact with the retaining member 3, the cam 4 can be rotatably installed Installed in the installation tube 1, the driving assembly is connected to the cam 4 so that the driving assembly can drive the cam 4 to rotate, and then the rotating cam 4 drives the retaining member 3 to move along the radial direction of the installation tube 1. In this way, when the flexible tube 5 is too fast in the process of descending along the oil well, the driving assembly can drive the cam 4 to rotate to drive the retaining member 3 to move along the radial direction of the installation tube 1 close to the flexible tube 5, so that the protective tube 2 shrinks inwards and increases the clamping force on the flexible tube 5, thereby slowing down the descending speed of the flexible tube 5, avoiding the flexible tube 5 from descending too fast and colliding with the well wall or other underground structures, thereby reducing safety risks.

[0028] Alternatively, if Figure 2 As shown, the retaining member 3 includes a retaining plate 31 extending along the axial direction of the mounting tube 1 , and the inner wall surface of the retaining plate 31 is configured as an arc surface that matches the shape of the outer wall surface of the protection tube 2 .

[0029] In this optional embodiment, the inner wall surface of the retaining plate 31, that is, the wall surface of one side of the retaining plate 31 facing the central axis of the protective tube 2, is configured as an arc surface that is adapted to the shape of the outer wall surface of the protective tube 2. The arc surface can better fit the outer wall surface of the protective tube 2 to allow the protective tube 2 to produce a more uniform deformation, thereby helping to more evenly transfer the pressure applied by the retaining plate 31 to the surface of the flexible tube 5 to avoid damage to the flexible tube 5.

[0030] Alternatively, if Figure 2As shown, the axial direction of the cam 4 is parallel to the axial direction of the mounting tube 1, the axial length of the cam 4 along the mounting tube 1 is equal to the axial length of the retaining plate 31 along the mounting tube 1, and the length of the contact line between the outer wall surface of the cam 4 and the outer wall surface of the retaining plate 31 is equal to the axial length of the retaining plate 31 along the mounting tube 1.

[0031] In this optional embodiment, through the above-mentioned arrangement, the outer wall surface of the cam 4 can be in corresponding contact with the outer wall surface of the retaining plate 31 along the length direction of the retaining plate 31, ensuring that the pushing force of the cam 4 on the retaining plate 31 is evenly distributed in the length direction of the retaining plate 31, which is more conducive to protecting the flexible tube 5.

[0032] Alternatively, if Figure 3 and Figure 4 As shown, the wall of the mounting tube 1 is provided with a mounting hole 11 which passes through the mounting tube 1 in the radial direction, and the retaining member 3 also includes a boss 32 which is protruded on the outer side of the retaining plate 31 in the radial direction of the mounting tube 1, and the boss 32 is inserted into the mounting hole 11 and is movably arranged along the radial direction of the mounting tube 1 relative to the mounting hole 11.

[0033] It can be understood that the boss 32 is inserted into the mounting hole 11 and is movably arranged along the radial direction of the mounting tube 1 relative to the mounting hole 11. When the boss 32 moves along the radial direction of the mounting tube 1 relative to the mounting hole 11, the entire retaining member 3 can move along the radial direction of the mounting tube 1 relative to the mounting hole 1, thereby realizing that the retaining member 3 can be movably installed on the mounting tube 1 along the radial direction of the mounting tube 1.

[0034] In this optional embodiment, since the wall of the mounting cylinder 1 is provided with a mounting hole 11 which passes through the mounting cylinder 1 in the radial direction, and the retaining member 3 also includes a boss 32 which protrudes from the outer side of the retaining plate 31 in the radial direction of the mounting cylinder 1, the retaining member 3 can be movably installed in the mounting cylinder 1 in the radial direction of the mounting cylinder 1 by inserting the boss 32 into the mounting hole 11. The simple structure facilitates reducing the assembly complexity of the flexible tube clamping device.

[0035] Alternatively, if Figures 2 to 4 As shown, the retaining member 3 is provided with two bosses 32, and the two bosses 32 are respectively located at the two ends of the retaining plate 31 along the axial direction of the mounting tube 1, and the mounting holes 11 are respectively provided at the two ends of the barrel wall of the mounting tube 1 along the axial direction, and the two bosses 32 are respectively inserted into the two mounting holes 11.

[0036] In this optional embodiment, the above-mentioned arrangement enables the upper and lower ends of the retaining member 3 to be movably mounted on the mounting tube 1 respectively, thereby preventing the upper or lower end of the retaining member 3 from tilting when the retaining member 3 moves radially along the mounting tube 1, thereby helping to improve the stability of the radial movement of the retaining member 3 along the mounting tube 1.

[0037] Alternatively, if Figure 5 As shown, there are a plurality of retaining members 3 , which are evenly spaced apart along the circumference of the protection tube 2 , and there are a plurality of cams 4 , which are in contact with the plurality of retaining members 3 , respectively and correspondingly.

[0038] Specifically, four retainers 3 may be provided, so that the four retainers 3 just surround the protection tube 2 along the circumference of the protection tube 2 . In addition, four cams 4 may also be provided, and the four cams 4 are in contact with the four retainers 3 in a one-to-one correspondence.

[0039] In this optional embodiment, since the multiple retaining members 3 are evenly spaced along the circumference of the protective tube 2, and the multiple cams 4 are respectively in contact with the multiple retaining members 3, the multiple cams 4 can drive the multiple retaining members 3 to synchronously squeeze the protective tube 2 when rotating, so that the peripheral wall of the protective tube 2 is synchronously deformed toward the inside of the protective tube 2, so that the clamping force exerted on the flexible tube 5 can be more evenly distributed along the circumference of the flexible tube 5, thereby improving the clamping stability of the flexible tube 5.

[0040] Alternatively, if Figure 4 As shown, the driving assembly includes a plurality of first gears 61, a transmission ring 62, a second gear 63, a third gear 64, a worm wheel 65, a worm 66 and a motor 67. The plurality of first gears 61 are coaxially connected to the plurality of cams 4 respectively. The transmission ring 62 is rotatably disposed on the mounting tube 1 and its axial direction coincides with the axial direction of the mounting tube 1. The inner circumference of the transmission ring 62 is provided with an inner gear ring 621 meshing with the plurality of first gears 61. The outer circumference of the transmission ring 62 is provided with an outer gear ring 622. The second gear 63 meshes with the outer gear ring 622. The third gear 64 meshes with the second gear 63. The worm wheel 65 is coaxially connected to the third gear 64. The worm 66 meshes with the worm wheel 65. The motor 67 is drivingly connected to the worm 66.

[0041] In this optional embodiment, through the above-mentioned arrangement, when the motor 67 is driven, it can drive multiple first gears 61 to rotate simultaneously through the worm 66, the worm wheel 65, the third gear 64, the second gear 63, and the transmission ring 62 in sequence, thereby driving multiple cams 4 to rotate synchronously, and then driving multiple retaining members 3 to move radially at the same time, which is beneficial to ensure the synchronization of the activities of multiple retaining members 3 and improve the clamping effect of the flexible tube 5; in addition, the motor 67 transmits power to the cam 4 via the planetary gear system and the worm and worm gear mechanism, and the structure is relatively simple, which is conducive to reducing the difficulty of maintenance.

[0042] Alternatively, if Figure 6As shown, the flexible pipe clamping device further includes a reducer 68 , an adjustable friction clutch 69 and a brake 70 which are connected in sequence. The reducer 68 is connected to the worm 66 , and the motor 67 is connected to the brake 70 .

[0043] In this optional embodiment, the motor 67 can transmit torque to the worm 66 through the brake 70, the adjustable friction clutch 69 and the reducer 68, wherein the brake 70 can be opened when the motor 67 is turned off to ensure that the retaining member 3 is fixed in the adjusted position, thereby ensuring that the clamping force on the flexible tube 5 is constant and preventing the descending speed of the flexible tube 5 from fluctuating; in addition, the adjustable friction clutch 69 can be adjusted to change the size of the torque it can transmit, thereby changing the size of the torque that the motor 67 can transmit to the cam 4, so that the flexible tube clamping device can have different clamping force adjustment difficulties.

[0044] like Figure 7 As shown, the present invention provides a flexible pipe installation system, including a coil machine 200, a flexible pipe guiding device 300 and the flexible pipe clamping device 100 as described above, and the coil machine 200, the flexible pipe guiding device 300 and the flexible pipe clamping device 100 are arranged in sequence along the conveying direction of the flexible pipe 5.

[0045] Among them, the coil machine 200 can wind the flexible pipe 5, and the flexible pipe guiding device 300 can guide the flexible pipe 5 on the coil machine 200 to the oil well. The coil machine 200 and the flexible pipe guiding device 300 are conventional devices in the field, so their specific structures are not described here one by one.

[0046] In this embodiment, since the flexible pipe installation system includes the above-mentioned flexible pipe clamping device 100, it has all the beneficial effects brought by all the embodiments of the above-mentioned flexible pipe clamping device 100, and at least has the following beneficial effects: by arranging the protective pipe 2 in the installation tube 1, the protective pipe 2 can be passed through by the flexible pipe 5, the retaining member 3 is arranged on the outside of the protective pipe 2, and the retaining member 3 is movably installed on the installation tube 1 along the radial direction of the installation tube 1, so that when the retaining member 3 moves along the radial direction of the installation tube 1, the degree of compression of the protective pipe 2 by the retaining member 3 will change accordingly, thereby changing the deformation amount, so as to shrink inward or relax outward, thereby being able to change its clamping force on the flexible pipe 5; and by The wheel 4 is arranged on the side of the retaining member 3 away from the protective tube 2 and in contact with the retaining member 3. The cam 4 is rotatably installed on the mounting tube 1. The driving assembly is drivingly connected to the cam 4, so that the driving assembly can drive the cam 4 to rotate, and then the rotating cam 4 drives the retaining member 3 to move radially along the mounting tube 1. In this way, when the flexible tube 5 is descending too fast along the oil well, the driving assembly can drive the cam 4 to rotate, so as to drive the retaining member 3 to move radially close to the flexible tube 5 along the mounting tube 1, so that the protective tube 2 contracts inwardly and increases the clamping force on the flexible tube 5, thereby slowing down the descending speed of the flexible tube 5, avoiding the flexible tube 5 from descending too fast and colliding with the well wall or other underground structures, thereby reducing safety risks.

[0047] The present invention provides a flexible pipe installation method, based on the flexible pipe installation system as described above, the flexible pipe installation method comprises: Step S10: Pass the flexible tube 5 through the protective tube 2, and the lower end of the flexible tube 5 passes through the protective tube 2 and extends into the wellhead.

[0048] Step S20: Open the adjustable friction clutch 69.

[0049] Step S30: Close the brake 70 and start the motor 67. The motor 67 drives the cam 4 to rotate through the transmission mechanism, and then drives the retaining member 3 to move along the radial direction of the mounting tube 1, so that the deformation of the protection tube 2 changes and the clamping force on the flexible tube 5 is adjusted.

[0050] Step S40: When the speed at which the flexible pipe 5 descends along the wellhead reaches a preset value, the motor 67 is turned off, and the brake 70 is turned on.

[0051] Specifically, refer to Figure 7 Before step S10 , the flexible pipe 5 wound on the coiler 200 may be pulled toward the flexible pipe guiding device 300 , then pass through the flexible pipe guiding device 300 , and finally enter the flexible pipe clamping device 100 .

[0052] It should be noted that, in step S20, the adjustable friction clutch 69 can be adjusted while being opened to ensure that the flexible pipe clamping device 100 is at a better clamping force adjustment difficulty.

[0053] It should also be noted that the preset value may be a speed value that allows the flexible pipe 5 to descend safely and smoothly, and may be determined on site according to actual conditions.

[0054] In this embodiment, the flexible tube 5 is first passed through the protective tube 2, and the lower end of the flexible tube 5 passes through the protective tube 2 and extends into the wellhead to realize the installation of the flexible tube 5 in the flexible tube clamping device 100, and then the adjustable friction clutch 69 is opened to ensure that the motor 67 can transmit torque to the cam 4, and then the brake 70 is closed, and then the motor 67 is started to use the motor 67 to drive to adjust the clamping force on the flexible tube 5. Finally, when the speed at which the flexible tube 5 descends along the wellhead reaches a preset value, the motor 67 is closed, and the brake 70 is opened to fix the clamping force on the flexible tube 5 at the adjusted value, so that the flexible tube 5 can be at the required descending speed, avoiding the flexible tube 5 from descending too fast and colliding with the well wall or other underground structures, thereby reducing safety risks.

[0055] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A flexible pipe clamping device, characterized in that: The invention comprises a mounting tube (1), a protective tube (2), a retaining member (3), a cam (4) and a driving assembly, wherein the protective tube (2) is arranged in the mounting tube (1), the protective tube (2) is used for a flexible tube (5) to pass through, the retaining member (3) is arranged on the outer side of the protective tube (2), the cam (4) is arranged on the side of the retaining member (3) away from the protective tube (2), the retaining member (3) and the cam (4) are in contact with each other, the retaining member (3) is movably mounted on the mounting tube (1) along the radial direction of the mounting tube (1), the cam (4) is rotatably mounted on the mounting tube (1), and the driving assembly is drivingly connected to the cam (4) and is used for driving the cam (4) to rotate so as to drive the retaining member (3) to move along the radial direction of the mounting tube (1), so that the deformation of the protective tube (2) is changed to adjust the clamping force on the flexible tube (5).

2. The flexible pipe clamping device according to claim 1, characterized in that: The retaining member (3) comprises a retaining plate (31) extending along the axial direction of the mounting tube (1), and the inner wall surface of the retaining plate (31) is arranged as a curved surface that matches the shape of the outer wall surface of the protection tube (2).

3. The flexible pipe clamping device according to claim 2, characterized in that: The axial direction of the cam (4) is parallel to the axial direction of the mounting tube (1); the length of the cam (4) along the axial direction of the mounting tube (1) is equal to the length of the retaining plate (31) along the axial direction of the mounting tube (1); and the length of the contact line between the outer wall surface of the cam (4) and the outer wall surface of the retaining plate (31) is equal to the length of the retaining plate (31) along the axial direction of the mounting tube (1).

4. The flexible pipe clamping device according to claim 2, characterized in that: The wall of the mounting tube (1) is provided with a mounting hole (11) which penetrates radially of the mounting tube (1); the retaining member (3) further comprises a boss (32) which is protruded radially of the mounting tube (1) on the outer side of the retaining plate (31); the boss (32) is inserted into the mounting hole (11) and is movably arranged radially of the mounting tube (1) relative to the mounting hole (11).

5. The flexible pipe clamping device according to claim 4, characterized in that: The retaining member (3) is provided with two bosses (32), and the two bosses (32) are respectively located at two ends of the retaining plate (31) along the axial direction of the mounting tube (1), and the mounting holes (11) are respectively provided at two ends of the tube wall of the mounting tube (1) along the axial direction, and the two bosses (32) are respectively inserted into the two mounting holes (11).

6. The flexible pipe clamping device according to claim 1, characterized in that: A plurality of the retaining members (3) are provided, and the plurality of the retaining members (3) are evenly spaced and arranged along the circumference of the protection tube (2); a plurality of the cams (4) are provided, and the plurality of the cams (4) are respectively in contact with the plurality of the retaining members (3).

7. The flexible pipe clamping device according to claim 6, characterized in that: The driving assembly comprises a plurality of first gears (61), a transmission ring (62), a second gear (63), a third gear (64), a worm wheel (65), a worm (66) and a motor (67). The plurality of first gears (61) are respectively coaxially connected to the plurality of cams (4). The transmission ring (62) is rotatably arranged on the mounting tube (1) and its axial direction coincides with the axial direction of the mounting tube (1). The inner circumferential surface of the transmission ring (62) is provided with an inner gear ring (621) meshing with the plurality of first gears (61). The outer circumferential surface of the transmission ring (62) is provided with an outer gear ring (622). The second gear (63) meshes with the outer gear ring (622). The third gear (64) meshes with the second gear (63). The worm wheel (65) is coaxially connected to the third gear (64). The worm (66) meshes with the worm wheel (65). The motor (67) is drivingly connected to the worm (66).

8. The flexible pipe clamping device according to claim 7, characterized in that: It also includes a reducer (68), an adjustable friction clutch (69) and a brake (70) which are connected in sequence, wherein the reducer (68) is connected to the worm (66), and the motor (67) is connected to the brake (70).

9. A flexible pipe installation system, characterized in that: The invention comprises a tube coiling machine (200), a flexible tube guiding device (300) and a flexible tube clamping device (100) as claimed in any one of claims 1 to 8, wherein the tube coiling machine (200), the flexible tube guiding device (300) and the flexible tube clamping device (100) are arranged in sequence along the conveying direction of the flexible tube (5).

10. A flexible pipe installation method, based on the flexible pipe installation system according to claim 9, characterized in that: The flexible pipe installation method comprises: Passing the flexible pipe (5) through the protective pipe (2), with the lower end of the flexible pipe (5) passing through the protective pipe (2) and extending into the wellhead; Opening the adjustable friction clutch (69); The brake (70) is closed, and the motor (67) is started again. The motor (67) drives the cam (4) to rotate via the transmission mechanism, and then drives the retaining member (3) to move along the radial direction of the mounting tube (1), so that the deformation of the protection tube (2) changes and the clamping force on the flexible tube (5) is adjusted; When the speed at which the flexible pipe (5) descends along the wellhead reaches a preset value, the motor (67) is turned off and the brake (70) is turned on.

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