Lining drawing device for oil pipelines

Abstract

The present invention discloses a liner drawing device for oil pipelines, which relates to the field of oil engineering technology. The liner drawing device for oil pipelines includes a bearing assembly, a drawing assembly, a heating mechanism, and a traction member. The bearing assembly is provided with a heating zone. The drawing assembly is detachably provided at one end of the bearing assembly, and the outer periphery of the drawing assembly is pressed against the liner. The heating mechanism is provided in the heating zone, and a delay gap is provided between the heating mechanism and the drawing assembly. The drawing assembly is connected to an external traction mechanism via the traction member, and the traction mechanism is used to drive the drawing assembly to drive the bearing assembly and the heating mechanism to move axially along the oil pipeline. The present invention provides a delay gap between the heating mechanism and the drawing assembly, so that the heating mechanism can preheat the liner before the drawing assembly is pressed against the liner, thereby realizing a drawing and heating operation mode, reducing the risk of the liner breaking during the drawing process, and improving the maintenance efficiency of the oil pipeline.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum engineering, in particular to a lining drawing device for a petroleum pipeline. Background Art

[0002] The lining of oil pipelines is an important means to solve problems such as eccentric wear, corrosion and scaling of oil pipelines. Its application and development are of great significance to improving the life of oil wells and reducing production costs. The linings used are mostly ultra-high molecular weight polyethylene. However, this type of lining still suffers from severe corrosion or eccentric wear after a period of use, and needs to be replaced separately.

[0003] At present, when the lining is severely corroded or severely worn, the risk of lining fracture increases significantly, making it difficult to remove the damaged lining within a single pulling cycle. This results in a long lining removal process for oil pipelines and reduces the maintenance efficiency of oil pipelines. Summary of the Invention

[0004] The main purpose of the present invention is to provide a liner drawing device for oil pipelines, aiming to reduce the risk of liner breakage during the drawing process and improve the maintenance efficiency of oil pipelines.

[0005] To achieve the above-mentioned object, the present invention provides a lining drawing device for a petroleum pipeline, comprising:

[0006] A bearing assembly, the bearing assembly extending along the axial direction of the oil pipeline, the bearing assembly being provided with a heating zone;

[0007] A pulling assembly, the pulling assembly being detachably disposed at one end of the bearing assembly, the outer periphery of the pulling assembly being pressed against the inner liner;

[0008] A heating mechanism, the heating mechanism is arranged in the heating zone, and a delay gap is provided between the heating mechanism and the drawing assembly, the delay gap is used to allow the heating mechanism to preheat the lining;

[0009] The pulling component is connected to an external pulling mechanism through the pulling component, and the pulling mechanism is used to drive the pulling component to drive the bearing component and the heating mechanism to move along the axial direction of the oil pipeline.

[0010] In one embodiment, the bearing assembly includes a first limit member and a center rod, the center rod extends axially along the oil pipeline, the heating zone is provided on the periphery of the center rod, and the first limit member is sleeved on one end of the center rod; the pulling assembly is detachably connected to the first limit member, the heating mechanism is sleeved on the center rod, and the delay gap is provided between the heating mechanism and the first limit member.

[0011] In one embodiment, the pulling assembly includes a pulling head and a connecting rod, the pulling head is sleeved on the connecting rod, the first limiting member is provided with a connecting hole at a position corresponding to the connecting rod, and the connecting rod is detachably connected to the connecting hole.

[0012] In one embodiment, a mounting surface is provided on a side of the pulling head facing the first limiting member, a portion of the mounting surface is exposed at the periphery of the first limiting member, and a hanging ear is connected to the mounting surface, and the hanging ear is detachably connected to the pulling member.

[0013] In one embodiment, there are multiple hanging ears, and the multiple hanging ears are arranged at intervals along the circumference of the pulling head; there are multiple traction members, and the number of the traction members is consistent with the number of the hanging ears and is arranged in a one-to-one correspondence.

[0014] In one embodiment, the supporting assembly further includes a second limiting member, which is sleeved on the other end of the center rod, the heating zone is arranged between the first limiting member and the second limiting member, and the ends of the plurality of traction members away from the first limiting member are connected to the traction mechanism through the second limiting member.

[0015] In one embodiment, a scraping ring is provided on the outer periphery of the pulling assembly, and the scraping ring is used to scrape the lining.

[0016] In one embodiment, the heating mechanism includes a cylinder, a heating assembly and a mounting assembly, the cylinder extends axially along the oil pipeline, the mounting assembly is sleeved on the end of the cylinder, the cylinder is arranged in the heating zone and sleeved on the bearing assembly, the heating assembly is detachably mounted on the cylinder, and the delay gap is provided between the mounting assembly and the drawing assembly, and the delay gap is used to enable the heating assembly to preheat the lining.

[0017] In one embodiment, the heating component includes a mounting seat and an electric heating structure, the outer wall of the cylinder is provided with a slot, the bottom wall of the slot is provided with a wire hole, the mounting seat is plugged into the slot, the power supply line of the mounting seat extends into the wire hole and is electrically connected to an external power supply; the electric heating structure is sleeved on the outer periphery of the cylinder, and the electric heating structure is electrically connected to the mounting seat.

[0018] In one embodiment, the mounting assembly includes a first mounting ring and a second mounting ring, the first mounting ring is sleeved on one end of the cylinder close to the pulling assembly, and the second mounting ring is sleeved on the other end of the cylinder, and the outer diameter of the first mounting ring is larger than the outer diameter of the second mounting ring.

[0019] The technical solution of the present invention sets a delay gap between the heating mechanism and the drawing assembly, so that the heating mechanism can preheat the lining before the drawing assembly presses against the lining. As a result, when the drawing assembly is pulled and moves axially along the oil pipeline, the delay gap reserves sufficient heating time for the heating mechanism. This enables the lining drawing device to continue heating during the drawing process without having to stop and wait for the heating mechanism to heat, thus achieving a working mode of heating while drawing. In addition, preheating can improve the flexibility of the lining and reduce the risk of lining breakage during the drawing process, effectively solving the problem of breakage caused by lining corrosion or uneven wear in the prior art. At the same time, preheating can also increase the gripping force or contact area between the lining and the drawing assembly, ensuring that the drawing assembly can firmly grip or press against the lining, avoiding the situation where the lining breaks in sections during the drawing process. It solves the technical problem that the lining of the oil pipeline is difficult to remove within a single drawing cycle under the condition of severe corrosion or severe eccentric wear, enhances the flexibility and ductility of the lining during the drawing process, reduces the risk of the lining breaking during the drawing process, and improves the success rate of drawing, thereby greatly improving and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the rear side structure of an embodiment of a liner drawing device for a petroleum pipeline provided by the present invention;

[0022] Figure 2 A schematic diagram of the front and side structure of an embodiment of a liner drawing device for a petroleum pipeline provided by the present invention;

[0023] Figure 3 A schematic diagram of the explosion structure of an embodiment of a liner drawing device for a petroleum pipeline provided by the present invention;

[0024] Figure 4 This is a schematic diagram of the explosion structure of an embodiment of the heating mechanism according to the present invention;

[0025] Figure 5 This is a schematic diagram of the explosion structure of an embodiment of a heating component according to the present invention.

[0026] Description of Figure Numbers:

[0027] 100, bearing assembly; 200, pulling assembly; 300, heating mechanism; 400, traction member; 101, heating zone; 110, first limiting member; 120, center rod; 111, mounting surface; 130, hanging ear; 140, second limiting member; 210, pulling head; 201, connecting hole; 220, scraper ring; 301, delay gap; 310, cylinder; 320, heating assembly; 330, mounting assembly; 340, protective net; 311, slot; 312, wire hole; 321, mounting seat; 322, electric heating structure; 331, first mounting ring; 332, second mounting ring.

[0028] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0030] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] The lining of oil pipelines is an important means to solve problems such as eccentric wear, corrosion and scaling of oil pipelines. Its application and development are of great significance to improving the life of oil wells and reducing production costs. The linings used are mostly ultra-high molecular weight polyethylene. However, this type of lining still suffers from severe corrosion or eccentric wear after a period of use, and needs to be replaced separately.

[0033] At present, when the lining is severely corroded or severely worn, the risk of lining fracture increases significantly, making it difficult to remove the damaged lining within a single pulling cycle. This results in a long lining removal process for oil pipelines and reduces the maintenance efficiency of oil pipelines.

[0034] Moreover, when the risk of lining fracture increases significantly, for the method of removing the lining by pulling after tightening the screw threader or the method of removing the lining by pulling after tightening and expanding the screw, the lining strength in the corroded or unevenly worn areas is significantly reduced, and the lining is very likely to break in sections at weak points during the drawing process. In addition, the hardness of the lining in the corroded area is reduced, resulting in insufficient gripping force, making it even more difficult to remove the damaged lining within a single drawing cycle.

[0035] In order to solve this technical problem, the present invention proposes a lining drawing device for a petroleum pipeline.

[0036] See also Figures 1 to 3 In one embodiment of the present invention, the liner drawing device for a petroleum pipeline includes a bearing assembly 100, a drawing assembly 200, a heating mechanism 300 and a traction member 400. The bearing assembly 100 extends axially along the petroleum pipeline and is provided with a heating zone 101. The drawing assembly 200 is detachably provided at one end of the bearing assembly 100, and the outer periphery of the drawing assembly 200 is pressed against the liner. The heating mechanism 300 is provided in the heating zone 101, and a delay gap 301 is provided between the heating mechanism 300 and the drawing assembly 200. The delay gap 301 is used to enable the heating mechanism 300 to preheat the liner. The drawing assembly 200 is connected to an external traction mechanism through the traction member 400. The traction mechanism is used to drive the drawing assembly 200 to drive the bearing assembly 100 and the heating mechanism 300 to move axially along the petroleum pipeline.

[0037] Specifically, in the liner drawing device of the present application, the load-bearing assembly 100, drawing assembly 200, heating mechanism 300, and pulling member 400 are all housed within a petroleum pipeline. The radial dimensions of the load-bearing assembly 100 and heating mechanism 300 are both smaller than the radial dimensions of the oil pipeline's liner, while the radial dimensions of the drawing assembly 200 allow its circumferential outer wall to cover the radial area of ​​the liner.

[0038] In actual use, a traction mechanism, such as a winch, pulls the traction member 400, which drives the drawing assembly 200 to move axially along the oil pipeline. The drawing assembly 200, in turn, drives the support assembly 100 and the heating mechanism 300 to move synchronously. A delay gap 301 is provided between the heating mechanism 300 and the drawing assembly 200, allowing the heating mechanism 300 to preheat the lining before the drawing assembly 200 contacts the lining. As the drawing assembly 200 is drawn and moves axially along the oil pipeline, heating time is reserved for the heating mechanism 300. This allows the drawing assembly 200 to be drawn while the lining is heated, eliminating the need to stop the machine to wait for the heating mechanism 300 to heat up.

[0039] More specifically, due to the presence of delay gap 301, a certain distance is created between heating mechanism 300 and drawing assembly 200. As drawing assembly 200 moves axially along the oil pipeline, the liner is first heated by heating mechanism 300 before coming into contact with drawing assembly 200. This preheating method is particularly suitable for liners subject to severe corrosion or uneven wear, as the liner strength in these areas is significantly reduced, and direct drawing can easily lead to segmented liner fracture at weak points. Preheating increases the temperature of the liner material, enhancing molecular activity and making the material softer, allowing it to better adapt to changes in tension during drawing and reducing the risk of fracture.

[0040] Compared to traditional liner pulling methods, such as pulling after tightening with a screwdriver or pulling after tightening and expanding with a lead screw, the liner pulling device of the present application significantly improves the success rate of pulling the liner in areas with severe corrosion or uneven wear by combining heat pretreatment with a time delay gap 301. When faced with a liner with significantly reduced strength, traditional methods often cause the liner to break in sections during the pulling process due to insufficient gripping force or insufficient strength of the liner itself, making it difficult to complete the pulling process within a single pulling cycle. However, the device of the present application not only enhances the ductility of the liner by preheating the liner, making it easier to pull out in a whole state, but also improves the contact quality between the pulling assembly 200 and the liner, enhancing the gripping effect, thereby enabling the damaged liner to be completely removed within a single pulling cycle, greatly improving the maintenance efficiency of the oil pipeline.

[0041] In the technical solution provided by the present invention, a delay gap 301 is provided between the heating mechanism 300 and the drawing assembly 200, enabling the heating mechanism 300 to preheat the liner before the drawing assembly 200 abuts against the liner. This delay gap 301 provides sufficient heating time for the heating mechanism 300 as the drawing assembly 200 is drawn and moves axially along the oil pipeline. This allows the liner drawing device to continuously heat during the drawing process, eliminating the need to stop the machine to wait for the heating mechanism 300 to heat, thus achieving a drawing-while-heating operation. Furthermore, preheating improves the liner's flexibility and reduces the risk of liner fracture during the drawing process, effectively addressing the existing problem of liner fracture caused by corrosion or uneven wear. Furthermore, preheating increases the gripping force or contact area between the liner and the drawing assembly 200, ensuring that the drawing assembly 200 can firmly grasp or abut the liner, preventing the liner from fracturing in sections during the drawing process. It solves the technical problem that the lining of the oil pipeline is difficult to remove within a single drawing cycle under the conditions of severe corrosion or severe eccentric wear, enhances the flexibility and ductility of the lining during the drawing process, reduces the risk of the lining breaking during the drawing process, and improves the success rate of drawing, thereby greatly improving the maintenance efficiency of the oil pipeline and reducing the maintenance cost.

[0042] As an optional embodiment, the heating mechanism 300 may utilize annular heating elements evenly distributed around the circumference of the heating zone 101 to ensure all-around heating of the lining. The heating elements, which may be in the form of heating wires, heating tubes, or induction heaters, can evenly transfer heat to the lining, preventing localized overheating or insufficient heating. The heating mechanism 300 may also be equipped with a temperature control system that monitors the heating temperature in real time and automatically adjusts the heating power to ensure the lining is in an ideal softened state, facilitating drawing while preventing excessive deformation or damage due to high temperatures.

[0043] Please continue reading Figures 1 to 3 In an embodiment of the present invention, the bearing assembly 100 includes a first limit member 110 and a center rod 120. The center rod 120 extends along the axial direction of the oil pipeline. A heating zone 101 is provided on the periphery of the center rod 120. The first limit member 110 is sleeved on one end of the center rod 120. The pulling assembly 200 is detachably connected to the first limit member 110. The heating mechanism 300 is sleeved on the center rod 120, and a delay gap 301 is provided between the heating mechanism 300 and the first limit member 110.

[0044] Specifically, the first stopper 110 utilizes a first stop ring, which is mounted on the end of the center rod 120. The center rod 120, serving as the main component of the load-bearing assembly 100, has a radial dimension smaller than that of the oil pipeline lining, enabling the center rod 120 to move smoothly within the oil pipeline. The peripheral area of ​​the center rod 120 forms a heating zone 101, within which the heating mechanism 300 is mounted, preheating the lining. A detachable connection is employed between the first stopper 110 and the drawing assembly 200, facilitating assembly and disassembly for ease of maintenance.

[0045] In actual use, the pulling assembly 200 is connected to the center rod 120 via the first stopper 110. When the traction mechanism pulls the pulling assembly 200 via the traction member 400, the pulling assembly 200 transmits the pulling force to the center rod 120 via the first stopper 110. The annular structure of the first stopper 110 increases the contact area between the pulling assembly 200 and the support assembly 100, making the pulling force transmitted from the pulling assembly 200 to the support assembly 100 more evenly distributed. This effectively prevents the support assembly 100 from rotating during the pulling process, avoiding the problem of the traction member 400 becoming entangled with the support assembly 100, ensuring that the pulling assembly 200 maintains a stable operating state and evenly scrapes the inner lining of the oil pipeline.

[0046] At the same time, the delay gap 301 provided between the heating mechanism 300 and the first stopper 110 enables the heating mechanism 300 to preheat the lining before the drawing assembly 200 is pressed against the lining. The reliable connection between the first stopper 110 and the drawing assembly 200 ensures the stability of the drawing assembly 200 during the drawing process, thereby ensuring the effectiveness of the delay gap 301 and making the preheating process more controllable.

[0047] More specifically, the center rod 120, serving as the main component of the support assembly 100 and extending axially along the oil pipeline, provides the structural foundation for mounting the heating mechanism 300. Its length ensures a suitable delay gap 301 is formed between the heating mechanism 300 and the drawing assembly 200. The center rod 120 can be made of a metal material, such as stainless steel or alloy steel, possessing sufficient strength and rigidity to withstand the tensile forces during the drawing process without deformation. A heating zone 101 is defined around the periphery of the center rod 120, where the heating mechanism 300 is mounted and secured, ensuring stable operation and effective heating of the liner.

[0048] The first stopper 110 is mounted on one end of the center rod 120 and serves as a stopper and connection. On the one hand, a fixed connection is formed between the first stopper 110 and the center rod 120, which can be achieved by welding, threading, or snapping. On the other hand, the first stopper 110 provides a connection interface for the pulling assembly 200, enabling the pulling assembly 200 to be detachably connected to the supporting assembly 100. The presence of the first stopper 110 increases the contact area between the pulling assembly 200 and the supporting assembly 100, thereby making the pulling force transmitted from the pulling assembly 200 to the supporting assembly 100 more uniform when the traction mechanism pulls the pulling assembly 200. This prevents the supporting assembly 100 from rotating and causing the traction member 400 to become entangled with the supporting assembly 100, thereby affecting the state of the pulling assembly 200 and enabling the pulling assembly 200 to evenly scrape the lining of the inner wall of the oil pipeline.

[0049] The pull assembly 200 is detachably connected to the first stopper 110. This detachable connection facilitates replacement of different pull assemblies 200 according to varying liner conditions and pipe specifications. The connection can be a threaded connection, a snap-fit ​​connection, or other reliable detachable connection method. When the pull assembly 200 is connected to the first stopper 110, the outer periphery of the pull assembly 200 can abut against the liner, enabling gripping and pulling of the liner.

[0050] The heating mechanism 300 is mounted on the center rod 120 and is positioned within the heating zone 101. The heating mechanism 300 can be an annular structure that completely surrounds the center rod 120 to achieve uniform heating of the lining. A delay gap 301 is provided between the heating mechanism 300 and the first stopper 110. During the drawing process, the heating mechanism 300 can preheat the lining before the drawing assembly 200. The length of the delay gap 301 can be adjusted based on factors such as the thermal response characteristics of the lining material and the drawing speed to ensure that the lining is fully heated and softened to achieve the optimal drawing state.

[0051] When the traction mechanism pulls the pulling assembly 200 via the traction member 400, the pulling assembly 200 moves the first stopper 110 and the center rod 120 connected thereto. Because the heating mechanism 300 is mounted on the center rod 120, the entire assembly moves in unison along the axial direction of the oil pipeline. During this process, the heating mechanism 300 remains positioned at a delay gap 301 in front of the pulling assembly 200, preheating the lining area to be drawn, softening the lining material, enhancing its ductility and plasticity, and reducing the risk of lining fracture.

[0052] Please continue reading Figures 1 to 3In an embodiment of the present invention, the pulling assembly 200 includes a pulling head 210 and a connecting rod. The pulling head 210 is sleeved on the connecting rod. The first limiting member 110 is provided with a connecting hole 201 at a position corresponding to the connecting rod. The connecting rod is detachably connected to the connecting hole 201.

[0053] Specifically, the pulling head 210 serves as the main component of the pulling assembly 200. Its outer periphery abuts against the inner liner, enabling it to grip and pull the inner liner during the pulling process. The pulling head 210 can have a conical or cylindrical structure, and its outer surface can be provided with gripping features such as tooth-like protrusions, spiral patterns, or a friction-enhancing layer to increase friction with the contact surface of the inner liner. The pulling head 210 is mounted on a connecting rod, and the two can be securely connected through an interference fit, welding, screw fastening, or other connection methods to ensure that they will not loosen or detach during the pulling process.

[0054] The connecting rod, serving as the connecting portion of the pulling assembly 200, is connected to the pulling head 210 at one end and detachably connected to the connecting hole 201 of the first stopper 110 at the other end. The connecting hole 201 is coaxially arranged with the center rod 120. This coaxial arrangement ensures that, after the connecting rod is inserted into the connecting hole 201, its axis coincides with the axis of the center rod 120, thereby forming a straight line between the pulling assembly 200 and the load-bearing assembly 100 and ensuring that the pulling force can be directly transmitted along the axial direction. The connection between the connecting rod and the connecting hole 201 can be achieved by threading, snap-fitting, or other reliable, detachable connection methods, facilitating installation and removal as needed.

[0055] The connecting hole 201 is coaxially arranged with the center rod 120, so that after the connecting rod is inserted into the connecting hole 201, its axial pulling force can be directly transmitted to the center rod 120, avoiding the pulling force acting on the heating mechanism 300, effectively preventing the heating mechanism 300 from being squeezed and damaged, and improving the service life of the heating mechanism 300. Secondly, the coaxial setting ensures that the pulling force is transmitted along the axial direction of the device, reducing the generation of lateral force and reducing the risk of deflection or deformation of the device during the pulling process. Finally, the coaxial setting also makes the connection between the pulling assembly 200 and the supporting assembly 100 tighter and more stable, capable of withstanding greater pulling force, and suitable for the pulling of various oil pipeline liners.

[0056] During actual use, when the liner needs to be removed, the connecting rod is first inserted into the connecting hole 201 of the first stopper 110 to form a detachable connection. The pulling assembly 200 is then connected to the external traction mechanism via the traction member 400. Under the action of the traction mechanism, the pulling assembly 200 drives the bearing assembly 100 and the heating mechanism 300 to move axially along the oil pipeline. During this process, the heating mechanism 300 preheats the liner, softening the lining material and enhancing its plasticity and ductility. Subsequently, the pulling head 210 contacts and presses against the liner, grasping the liner through its peripheral gripping structure and pulling it out of the oil pipeline.

[0057] As an optional embodiment, the connecting rod is formed by extending the center rod 120, that is, the connecting rod is an integral extension of the center rod 120. This structural configuration integrates the connecting rod and the center rod 120, further improving the efficiency of pulling force transmission. When the pulling mechanism pulls the pulling assembly 200, the pulling head 210 transmits the pulling force directly to the center rod 120 via the connecting rod, avoiding force transmission losses between multiple parts and reducing stress concentration caused by the mating of the parts.

[0058] As another optional embodiment, the connecting rod can be a separate structure from the central rod 120, and connected to the central rod 120 by a detachable method such as a threaded connection or a snap connection. This structural configuration is easy to disassemble and maintain, and can also ensure the effective transmission of the pulling force.

[0059] Please continue reading Figures 1 to 3 In an embodiment of the present invention, a mounting surface 111 is provided on the side of the pulling head 210 facing the first limit member 110, and a portion of the mounting surface 111 is exposed from the outer periphery of the first limit member 110. The mounting surface 111 is connected to a hanging ear 130, and the hanging ear 130 is detachably connected to the traction member 400.

[0060] Specifically, the pulling head 210 serves as the main body of the pulling assembly 200. Its outer periphery abuts against the inner liner, enabling gripping and pulling of the inner liner. A mounting surface 111 is provided on the side of the pulling head 210 facing the first stopper 110. This surface provides a platform for attaching the lug 130. The mounting surface 111 can be a flat area on the pulling head 210, or it can be a boss or groove structure, for securely attaching the lug 130.

[0061] Partially exposed areas of the mounting surface 111 extend beyond the periphery of the first stopper 110, allowing the lug 130 to avoid the first stopper 110 and connect to the pulling member 400. This prevents interference between the pulling member 400 and the first stopper 110, ensuring that the pulling member 400 can smoothly move the pulling assembly 200. Furthermore, because the mounting surface 111 is adjacent to the first stopper 110, when the pulling member 400 pulls the pulling head 210 via the lug 130, the pulling force is evenly transmitted along the mounting surface 111 to the first stopper 110, avoiding localized stress concentration.

[0062] The lug 130 is connected to the mounting surface 111 by welding, bolting, or other secure connection methods. The lug 130 can be ring-shaped, hook-shaped, or other suitable shapes for connection to the traction member 400. Its material should be sufficiently strong and wear-resistant to withstand the tension and wear during traction. The position and extension direction of the lug 130 should align with the pulling direction to ensure that the pulling force is directly transmitted along the axial direction of the device, avoiding the generation of deflection forces or torque.

[0063] The traction member 400 and the lug 130 utilize a detachable connection. For example, the traction member 400 may be a steel wire rope, one end of which is hooked to the lug 130 via a hook. This detachable connection facilitates quick connection and disconnection with the traction mechanism during installation or removal, improving operational efficiency. Furthermore, this detachable connection allows the device to adapt to different operating environments and requirements, such as selecting different traction members 400 specifications based on pipeline length or lining condition.

[0064] In actual operation, when the liner needs to be removed, the device is first inserted into the oil pipeline, with the outer periphery of the pulling head 210 pressed against the liner. Then, one end of the pulling member 400 is connected to the lug 130, and the other end is connected to an external pulling mechanism. The pulling mechanism is activated, and the lug 130 is pulled by the pulling member 400. The lug 130 transmits the pulling force to the pulling head 210, which then moves the connecting rod, first stopper 110, and center rod 120, and simultaneously moves the liner pressed against it, thereby pulling the liner out.

[0065] The hook 130 and the traction member 400 are detachably connected, which improves the operation convenience and adaptability of the device. This solves the technical problems of unstable traction connection, easy detachment or inconvenient operation in traditional pulling devices, and improves the reliability and efficiency of the pulling process.

[0066] As an optional embodiment, the lug 130 can be rotatable, for example, connected to the mounting surface 111 via a shaft or universal joint, allowing the lug 130 to rotate freely within a certain range. This rotatable structure can adapt to slight changes in the pulling direction, reducing damage to the device caused by deviation in the pulling direction, and improving the device's service life and operational reliability.

[0067] As another optional embodiment, the traction member 400 can be made of different materials and specifications based on specific requirements. For example, for a lining with mild corrosion or uneven wear, a thinner steel wire rope can be used as the traction member 400; for a lining with severe corrosion or uneven wear, a thicker, high-strength steel wire rope is required to provide sufficient pulling force. The length of the traction member 400 should also be selected based on the pipeline length and working requirements to ensure that it can cover the entire pulling distance.

[0068] Please continue reading Figures 1 to 3 In an embodiment of the present invention, there are multiple lugs 130, which are spaced apart along the circumference of the pulling head 210; there are multiple traction members 400, which are consistent with the number of lugs 130 and are arranged in a one-to-one correspondence.

[0069] Specifically, multiple lugs 130 are evenly distributed around the circumference of the pulling head 210, forming a circular array. Each lug 130 is connected to a corresponding traction member 400, achieving multi-point traction. For example, four lugs 130 can be evenly distributed around the circumference of the pulling head 210, and four traction members 400 can be configured accordingly, with each traction member 400 connected to a lug 130. This even distribution of multiple traction points around the circumference of the pulling head 210 ensures that the pulling force is evenly applied to the pulling head 210.

[0070] In actual use, when multiple traction members 400 simultaneously pull the pulling assembly 200, the pulling forces applied by each traction member 400 are balanced due to the even distribution of the lugs 130 along the circumference. This multi-point balanced traction method avoids the eccentric force problem that may be caused by single-point traction, ensuring that the pulling assembly 200 remains stable during movement without tilting or deflecting.

[0071] The traction member 400 can be a steel wire rope, a chain or other suitable flexible connecting member, one end of which is connected to the hanging ear 130, and the other end is connected to the external traction mechanism.

[0072] As an optional embodiment, when it is necessary to pull the liner, the device is first inserted into the oil pipeline so that the outer periphery of the pulling head 210 is pressed against the liner. Then, multiple traction members 400 are respectively connected to multiple hooks 130, and each hook 130 is connected to a traction member 400. The other ends of these traction members 400 are connected to an external traction mechanism, which can be connected to the same traction point or to multiple traction points. The traction mechanism is started, and multiple hooks 130 are pulled simultaneously by multiple traction members 400. The hooks 130 transmit the pulling force to the pulling head 210, and the pulling head 210 drives other components and the liner to move together to achieve the pulling and removal of the liner. Multi-point traction makes the pulling force more evenly distributed on the pulling head 210, avoids the deformation or deflection of the pulling head 210 that may be caused by single-point traction, and improves the stability of the drawing process. Secondly, when the liner is severely corroded or worn, a greater pulling force is required to remove it. Multiple hooks 130 and multiple traction members 400 provide a greater total pulling force, ensuring that each hook 130 and traction member 400 does not bear excessive load, reducing the risk of component damage. Finally, even if a problem occurs with one hook 130 or traction member 400, the others will continue to function, improving the fault tolerance and reliability of the device.

[0073] As another optional embodiment, the connection method between the pulling member 400 and the hanging ear 130 can also be adjusted according to actual needs. For example, a quick connection device such as a buckle, hook, or pin connection can be used to facilitate rapid installation and removal on site. Alternatively, a more secure connection method such as a bolt connection or a locking device can be used for severe corrosion or uneven wear conditions requiring high pulling force.

[0074] Please continue reading Figures 1 to 3 In an embodiment of the present invention, the bearing assembly 100 further includes a second limiting member 140, which is sleeved on the other end of the center rod 120. The heating zone 101 is arranged between the first limiting member 110 and the second limiting member 140. The ends of the multiple traction members 400 away from the first limiting member 110 are all connected to the traction mechanism through the second limiting member 140.

[0075] Specifically, the second stopper 140 is mounted on an end of the center rod 120 away from the first stopper 110, and is arranged opposite the first stopper 110. The heating zone 101 is located in the outer region of the center rod 120 between the first stopper 110 and the second stopper 140, and the heating mechanism 300 is mounted within the heating zone 101.

[0076] Multiple traction members 400 extend axially along the center rod 120 , and their ends close to the first limit member 110 are respectively connected to the lugs 130 on the pulling head 210 , while their ends away from the first limit member 110 are connected to the traction mechanism through the second limit member 140 .

[0077] In practice, the second stopper 140 not only limits the axial range of the heating zone 101 but also provides guidance for the multiple traction members 400. When the traction mechanism pulls the traction members 400, the second stopper 140 guides them to maintain a parallel arrangement, preventing entanglement or interference between the traction members 400 during movement. Furthermore, the second stopper 140 ensures that the multiple traction members 400 maintain the same pulling force arm, ensuring a more uniform transfer of the pulling force to the pulling assembly 200.

[0078] In addition, the first limiting member 110 and the second limiting member 140 work together to form double protection for the heating mechanism 300, thereby preventing the heating mechanism 300 from being squeezed by the external environment during the drawing process and extending the service life of the heating mechanism 300.

[0079] As an optional embodiment, the second limiting member 140 may be provided with guide holes corresponding to the number of the traction members 400 , and each guide hole is used to guide one traction member 400 .

[0080] As another optional embodiment, the second limiting member 140 may adopt an annular structure and be firmly connected to the central rod 120 by welding, threaded connection or other fixing methods.

[0081] Please continue reading Figures 1 to 3 In an embodiment of the present invention, a scraping ring 220 is provided on the outer periphery of the pulling assembly 200, and the scraping ring 220 is used to scrape the lining.

[0082] Specifically, the scraper ring 220 surrounds the outer circumference of the pulling assembly 200, and its outer diameter is adapted to the inner diameter of the oil pipeline lining. During the movement of the pulling assembly 200, the scraper ring 220 can maintain close contact with the lining and scrape the surface of the lining.

[0083] When the lining is damaged by corrosion or uneven wear, the scraper ring 220 scrapes the lining while the puller assembly 200 moves. Furthermore, for slightly damaged areas, the scraper ring 220 removes corrosion or wear debris from the lining surface, creating favorable conditions for subsequent lining replacement. Furthermore, for severely corroded areas, the scraper ring 220 directly removes these areas, preventing any remaining damaged lining from interfering with the installation of the new lining.

[0084] More specifically, the scraper ring 220 is an annular structure that is mounted on the outer circumference of the pulling assembly 200. Its outer diameter is slightly larger than the outer diameter of the pulling assembly 200 body, allowing it to directly contact the inner lining of the oil pipeline. The scraper ring 220 can be connected to the pulling assembly 200 through an interference fit, threaded connection, or other fixed method to ensure that it will not loosen or fall off during the pulling process. The position of the scraper ring 220 can be adjusted as needed. For example, it can be set at the front, middle, or rear of the pulling head 210, or multiple scraper rings 220 can be arranged along the length of the pulling assembly 200 to form a stepped or gradient scraping structure to achieve different degrees of scraping effect.

[0085] In actual application, first, the scraper ring 220 can remove loose materials on the surface of the lining, exposing a relatively strong lining layer, enhancing the effective contact between the pulling assembly 200 and the lining, improving the gripping force, and serving as an auxiliary tool before the auxiliary pulling process.

[0086] Secondly, scraper ring 220 can directly remove severely corroded and damaged oil pipeline linings. When certain areas of the lining have been severely corroded or worn to the point of being impossible to remove using conventional pulling methods, scraper ring 220 not only serves as an auxiliary pulling tool but also becomes an active cutting tool, directly scraping away the severely damaged lining areas, creating debris or small pieces that are then removed from the oil pipeline by the pulling assembly 200. This is particularly useful for linings that have lost their integrity and cannot be removed using integral pulling methods.

[0087] It should be understood that for linings with mild corrosion or uneven wear, a scraper ring 220 with a blunter edge can be used, which mainly serves to enhance the gripping force; while for linings with severe corrosion or uneven wear, a scraper ring 220 with a sharper edge can be used, which has stronger cutting ability and can effectively scrape off severely damaged areas.

[0088] Please continue reading Figures 1 to 3 , and see Figure 4 In an embodiment of the present invention, the heating mechanism 300 includes a cylinder 310, a heating component 320 and a mounting component 330. The cylinder 310 extends axially along the oil pipeline. The mounting component 330 is sleeved on the end of the cylinder 310. The cylinder 310 is arranged in the heating zone 101 and sleeved on the bearing component 100. The heating component 320 is detachably mounted on the cylinder 310. A delay gap 301 is provided between the mounting component 330 and the drawing component 200. The delay gap 301 is used to enable the heating component 320 to preheat the lining.

[0089] Specifically, the barrel 310 is sleeved around the center rod 120. Its inner diameter is larger than the outer diameter of the center rod 120, forming an annular space for the installation of the heating assembly 320. The heating assembly 320 is removably mounted within this annular space, facilitating maintenance and replacement. The mounting assembly 330 is sleeved around the end of the barrel 310 near the drawing assembly 200 and is used to secure the axial position of the barrel 310. The barrel 310 is positioned corresponding to the heating zone 101, ensuring that the heating assembly 320 can effectively heat the liner.

[0090] In actual use, the barrel 310 is coaxially arranged with the center rod 120, and the heating assembly 320 is fixed to the heating zone 101 by the barrel 310. As the drawing assembly 200 moves axially along the oil pipeline, the delay gap 301 provided between the mounting assembly 330 and the drawing assembly 200 allows the heating assembly 320 to preheat the liner before the drawing assembly 200 arrives. This structural configuration allows the heating assembly 320 to preheat the liner, improving its flexibility and creating favorable conditions for subsequent drawing operations.

[0091] More specifically, the heating assembly 320 is detachably mounted on the barrel 310, which facilitates maintenance, replacement, and upgrading of the heating assembly 320. The heating assembly 320 can be a heating wire, a heating tube, an induction heater, or other suitable heating elements.

[0092] Mounting assembly 330 is mounted on the end of barrel 310, providing a secure connection. Mounting assembly 330 can be annular and securely connected to barrel 310 through welding, threading, or other fastening methods. Mounting assembly 330 enables heating mechanism 300 to function as a single unit in conjunction with carrier assembly 100 and drawing assembly 200.

[0093] This embodiment achieves a modular structure for the heating mechanism 300 through the combined structure of the barrel 310, heating assembly 320, and mounting assembly 330. This modular structure allows the various components of the heating mechanism 300 to be adjusted, replaced, or upgraded as needed, thereby improving the flexibility and adaptability of the device. For example, heating assemblies 320 of different powers or types can be selected based on the thermal response characteristics of different lining materials; barrels 310 of different sizes can also be selected based on different pipe diameters. Furthermore, if the heating assembly 320 is damaged or its performance degrades, it can be easily replaced without replacing the entire heating mechanism 300, reducing maintenance costs and extending the service life of the device.

[0094] Please continue reading Figures 1 to 4 , and see Figure 5In an embodiment of the present invention, the heating component 320 includes a mounting seat 321 and an electric heating structure 322. The outer wall of the cylinder 310 is provided with a slot 311, and the bottom wall of the slot 311 is provided with a wire hole 312. The mounting seat 321 is plugged into the slot 311, and the power supply line of the mounting seat 321 extends into the wire hole 312 and is electrically connected to an external power supply; the electric heating structure 322 is sleeved on the outer periphery of the cylinder 310, and the electric heating structure 322 is electrically connected to the mounting seat 321.

[0095] Specifically, the barrel 310, serving as the foundational component of the heating assembly 320 and the main structure of the heating zone 101, has slots 311 disposed on its outer wall for receiving the mounting base 321. The slots 311 may be grooves distributed along the circumference of the barrel 310. The bottom wall of the slots 311 is provided with wire holes 312, which penetrate the wall of the barrel 310 and provide a passage for the power supply wires of the mounting base 321, allowing them to extend from the interior of the barrel 310 and connect to an external power source.

[0096] The mounting base 321 is inserted into the slot 311 to form a stable connection. The mounting base 321 can be made of an insulating material, such as ceramic, engineering plastic, or other high-temperature resistant insulating material to ensure electrical safety. The shape of the mounting base 321 matches the slot 311 and can be fixed in the slot 311 by an interference fit, a snap connection, or other means to ensure that it will not loosen or fall off during use. The power supply line of the mounting base 321 extends into the wire hole 312 and is electrically connected to an external power source, providing electrical energy to the electric heating structure 322 through the power supply line.

[0097] The electric heating structure 322 is sleeved around the outer circumference of the cylinder 310 and electrically connected to the mounting base 321. The electric heating structure 322 can be composed of multiple groups of heating wires spaced axially along the oil pipeline. Each group includes multiple curved heating wire segments, which are spaced circumferentially along the cylinder 310. A mounting base 321 is located between two adjacent curved heating wire segments. This structural arrangement allows the electric heating structure 322 to be evenly distributed around the outer circumference of the cylinder 310, providing a comprehensive heating effect and ensuring that the lining is evenly heated and softened.

[0098] During actual operation, when the device is inserted into a pipeline and the extraction process begins, an external power source provides power to mounting base 321 via a power line. Mounting base 321 then transmits this power to electric heating structure 322, which generates heat, heating barrel 310 and its surroundings. This heat is then transferred through barrel 310 to the pipeline's lining, softening the lining material and enhancing its plasticity and ductility, thereby reducing the risk of fracture during the extraction process.

[0099] As an optional embodiment, the heating assembly 320 further includes a protective net 340, which is disposed over the electric heating structure 322 and spaced apart from the electric heating structure 322. The protective net 340 protects the electric heating structure 322 from collision or friction with external objects during use, thereby extending its service life.

[0100] As another optional embodiment, the electric heating structure 322 can take the form of an electric heating film or electric heating plate, directly attached to the outer surface of the barrel 310. This structure offers a more compact size and improved thermal conductivity, making it suitable for applications where space is limited or higher heating efficiency is required. The electric heating film or electric heating plate can be attached to the barrel 310 using high-temperature adhesive or mechanical fastening. Its surface can be covered with a high-temperature resistant insulation layer to ensure electrical safety.

[0101] As another optional embodiment, the number and distribution of the mounting seats 321 can also be adjusted according to actual needs. For example, for a longer cylinder 310, multiple mounting seats 321 can be evenly distributed along the axial direction to ensure uniform heating of the entire surface of the cylinder 310. For a cylinder 310 with a larger diameter, multiple mounting seats 321 can be evenly distributed along the circumference to ensure uniform heat distribution around the cylinder 310.

[0102] As another optional embodiment, the mounting base 321 can adopt a modular structure to facilitate the individual replacement of damaged heating wire segments. The slot 311 can be provided with a positioning structure to ensure the installation direction of the mounting base 321 and prevent wiring errors.

[0103] Please continue reading Figure 4 In an embodiment of the present invention, the mounting assembly 330 includes a first mounting ring 331 and a second mounting ring 332. The first mounting ring 331 is sleeved on one end of the cylinder 310 close to the pulling assembly 200, and the second mounting ring 332 is sleeved on the other end of the cylinder 310. The outer diameter of the first mounting ring 331 is greater than the outer diameter of the second mounting ring 332.

[0104] Specifically, the first mounting ring 331 is sleeved on the end of the cylinder 310 close to the drawing assembly 200, i.e., the front end of the cylinder 310. The first mounting ring 331 can be securely connected to the cylinder 310 by interference fit, welding, threaded connection, or other fixing methods. The outer diameter of the first mounting ring 331 is larger than the outer diameter of the second mounting ring 332. This size difference enables the first mounting ring 331 to cover a larger radial range, forming an outwardly extending annular structure. This allows the first mounting ring 331 to act as a barrier during the drawing process, preventing debris generated when the drawing assembly 200 draws the liner from falling into the heat source of the heating assembly 320, thereby protecting the heating assembly 320 from being blocked or damaged by debris.

[0105] The second mounting ring 332 is mounted on the other end of the barrel 310, i.e., the rear end of the barrel 310. Similar to the first mounting ring 331, the second mounting ring 332 can also be fixedly connected to the barrel 310 through an interference fit, welding, threaded connection, or other means. The outer diameter of the second mounting ring 332 is smaller than that of the first mounting ring 331, resulting in the entire mounting assembly 330 having a tapered structure with a larger front and a smaller rear. This allows for smoother movement within the oil pipeline, reduces friction and resistance against the pipe wall, and improves movement efficiency.

[0106] As an optional embodiment, both the first mounting ring 331 and the second mounting ring 332 have through-holes extending axially along the oil pipeline for passage of the pulling member 400. The through-holes serve as a guide and constraint, ensuring that the pulling member 400 transmits the pulling force along the correct path during the pulling process, preventing entanglement or interference between the pulling member 400 and the heating assembly 320, which could affect the heating effect and pulling efficiency.

[0107] When the device is installed in an oil pipeline, the pulling assembly 200 is located in the front, the heating mechanism 300 is located in the middle, and the pulling member 400 passes from the rear through the through-hole in the second mounting ring 332, then through the through-hole in the first mounting ring 331, and finally connects to the pulling assembly 200. When the pulling mechanism pulls the pulling member 400, the pulling force is transmitted along the pulling member 400 to the pulling assembly 200, which drives the entire device to move within the oil pipeline.

[0108] As another optional embodiment, the outer surface of the first mounting ring 331 is beveled or arc-shaped to better guide the exfoliation to bypass the heating assembly 320 instead of directly blocking it, reducing the risk of exfoliation accumulation and increased resistance to device movement.

[0109] The above are merely exemplary embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All equivalent structural transformations made using the contents of the present invention's description and drawings, or direct / indirect applications in other related technical fields within the technical concept of the present invention are included in the scope of protection of the present invention.

Claims

1. A lining drawing device for a petroleum pipeline, characterized in that: include: A bearing assembly, the bearing assembly extending along the axial direction of the oil pipeline, the bearing assembly being provided with a heating zone; A pulling assembly, the pulling assembly being detachably mounted on one end of the carrying assembly, the outer periphery of the pulling assembly being surrounded by a plurality of scraping rings, the plurality of scraping rings forming a stepped or gradient scraping structure along the length direction of the pulling assembly; A heating mechanism, the heating mechanism is arranged in the heating zone, and a delay gap is provided between the heating mechanism and the drawing assembly, the delay gap is used to allow the heating mechanism to preheat the lining; A traction member, wherein the pulling assembly is connected to an external traction mechanism through the traction member, and the traction mechanism is used to drive the pulling assembly to drive the bearing assembly, the heating mechanism and the plurality of scraping rings to move axially along the oil pipeline, so that the plurality of scraping rings scrape the lining; The bearing assembly includes a first stopper and a center rod, the center rod extending axially along the oil pipeline, the heating zone being provided on the periphery of the center rod, and the first stopper being sleeved on one end of the center rod; the pulling assembly is detachably connected to the first stopper, the heating mechanism being sleeved on the center rod, and the delay gap being provided between the heating mechanism and the first stopper; The pulling assembly includes a pulling head and a connecting rod, the pulling head is sleeved on the connecting rod, the first limiting member is provided with a connecting hole at a position corresponding to the connecting rod, and the connecting rod is detachably connected to the connecting hole; The heating mechanism includes a cylinder, a heating assembly, and a mounting assembly. The cylinder extends axially along the oil pipeline. The mounting assembly is sleeved on the end of the cylinder. The cylinder is arranged in the heating zone and sleeved on the bearing assembly. The heating assembly is detachably mounted on the cylinder. A delay gap is provided between the mounting assembly and the drawing assembly. The delay gap is used to allow the heating assembly to preheat the liner. The heating component includes a mounting seat and an electric heating structure. The outer wall of the cylinder is provided with a slot, and the bottom wall of the slot is provided with a wire hole. The mounting seat is plugged into the slot, and the power supply line of the mounting seat extends into the wire hole and is electrically connected to an external power supply; the electric heating structure is sleeved on the outer periphery of the cylinder, and the electric heating structure is electrically connected to the mounting seat.

2. The lining drawing device for a petroleum pipeline according to claim 1, characterized in that: The pulling head is provided with a mounting surface on a side facing the first limiting member, a portion of the mounting surface is exposed at the outer periphery of the first limiting member, and the mounting surface is connected to a hanging ear, which is detachably connected to the pulling member.

3. The lining drawing device for a petroleum pipeline according to claim 2, characterized in that: There are multiple hanging ears, and the multiple hanging ears are arranged at intervals along the circumference of the pulling head; there are multiple traction members, and the number of the traction members is consistent with the number of the hanging ears and is arranged in a one-to-one correspondence.

4. The lining drawing device for a petroleum pipeline according to claim 3, characterized in that: The bearing assembly also includes a second limiting member, which is sleeved on the other end of the center rod. The heating zone is arranged between the first limiting member and the second limiting member. The ends of the multiple traction members away from the first limiting member are connected to the traction mechanism through the second limiting member.

5. The lining drawing device for a petroleum pipeline according to any one of claims 1 to 4, characterized in that: The mounting assembly includes a first mounting ring and a second mounting ring. The first mounting ring is sleeved on one end of the cylinder close to the pulling assembly, and the second mounting ring is sleeved on the other end of the cylinder. The outer diameter of the first mounting ring is greater than the outer diameter of the second mounting ring.

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