Retired tubing polyethylene liner pull-out device and method

Abstract

The application discloses a device and a method for pulling out a polyethylene lining of a scrapped oil pipe, and comprises a first device and a second device. The first device comprises a slide column cone body, one end of the slide column cone body is designed in a conical shape, a slide fixing sleeve is slidably connected to the outside of the slide column cone body, a plurality of mounting seats are fixedly installed on one side of the slide fixing sleeve in a circumferential direction, an insert block is arranged in each mounting seat, a locking bolt is arranged on one side of each mounting seat, the insert block and the mounting seat are fixed through the locking bolt, and an inverted hook dilatancy tooth plate is fixedly installed on one side of each insert block. The first device is used in cooperation with the second device, the lining pipe is first pulled out a distance through the first device, and then the lining pipe is completely pulled out through the second device. The device is simple and practical, reduces labor intensity, improves labor efficiency, is not affected by environmental temperature, and improves a safety operation coefficient.

Description

Technical Field

[0001] This invention relates to the technology for treating waste lined oil pipes, specifically a device and method for pulling out the polyethylene lining of waste oil pipes. Background Technology

[0002] Special polyethylene-lined tubing refers to tubing used in oilfields with a special polyethylene liner layer inside. This liner layer is tightly bonded to the inner wall of the tubing, forming a "tube-in-tube" structure. The special polyethylene layer is 3-4 mm thick. This type of tubing with a polyethylene liner layer provides corrosion resistance, wear resistance, and scale prevention. It can be widely used in various types of oil wells and water injection wells in oilfields, especially in pumping wells with uneven wear characteristics. The 3-4 mm polyethylene liner layer, with its barrier effect and low coefficient of friction, reduces wear between the sucker rod and the tubing wall, extending the lifespan of both the tubing and sucker rod, reducing the load on the polished rod and the stress at the tip of the sucker rod, and extending the service life of the tubing. Due to the low coefficient of friction and excellent wear resistance of special polyethylene material, it is widely used in industrial oilfields. Its corrosion and scale prevention properties effectively solve the long-standing problems of corrosion, uneven wear, and scaling in oilfield production wells, which is of great practical significance for reducing production capacity input in oilfields. After all, polyethylene-lined tubing is a consumable in oilfields with a limited service life. When certain parts of the pumping unit's well tubing wear down to a certain extent, the tubing liner must be replaced. If the replaced tubing body, couplings, and threads can still meet the requirements for continued service, the liner can be replaced, allowing it to be run back into the well for further service. Currently, every year a portion of scrapped tubing with liner is returned from users. The liner needs to be removed, and the corresponding pipe body, couplings, and threads need to be inspected. Those that pass inspection can continue to be used, with a special polyethylene liner. After passing inspection, they are shipped from the factory to the secondary operating area of ​​the oilfield for field application in the pumping unit wells, as qualified finished special polyethylene-lined tubing.

[0003] Currently, in existing scrapped polyethylene-lined oil pipes, the polyethylene liner is attached to the inner wall of the oil pipe. Because the oil pipe liner is manufactured by inserting the liner tube into the oil pipe using a necking method, and the liner tube expands on its own to form a "pipe-in-pipe" structure that is tightly attached to the inner wall of the oil pipe, this leads to the problem that the liner tube is not easy to pull out during actual production operation. Therefore, this application proposes a device and method for pulling out the polyethylene liner of scrapped oil pipes to solve this problem. Summary of the Invention

[0004] The purpose of this invention is to provide a device and method for pulling out the polyethylene liner of a scrapped oil pipe, so as to solve the problem mentioned in the background art that the liner is not easy to pull out during actual production operation.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A device and method for pulling out the polyethylene lining of a waste oil pipe includes a first device and a second device. The first device includes a sliding column cone, one end of which is tapered. A sliding fixing sleeve is slidably connected to the outer side of the sliding column cone. A plurality of mounting seats are fixedly installed along the circumferential direction on one side of the sliding fixing sleeve. Each mounting seat has an insert block inside, and a locking bolt is provided on one side of each mounting seat. The insert block is fixed to the mounting seat by the locking bolt. A barbed tensioning plate is fixedly installed on one side of each insert block. The other end of the sliding column cone... The outer side is provided with an external thread and is connected to a fixed pull nut through the external thread. A handle U-ring is fixedly installed on both sides of the fixed pull nut. The second device includes two retractable support arms. A fixing bolt is provided on one side of one of the retractable support arms. The fixing bolt passes through both retractable support arms. The two retractable support arms can rotate relative to each other through the fixing bolt. A through ring is fixedly installed on one side of each of the two retractable support arms. A steel wire rope is threaded through the two through rings. An inner lining locking ring is fixedly installed on the side of the other end of each of the two retractable support arms that is close to each other.

[0007] As a further embodiment of the present invention: a locking bolt is provided on one side of the fixed pull nut, and the fixed pull nut is fixed to the sliding column cone by the locking bolt.

[0008] As a further embodiment of the present invention: a first tooth is provided on the outer side of one end of the barbed tensioning tooth plate.

[0009] As a further embodiment of the present invention: both of the inner lining locking rings are provided with a second tooth inside.

[0010] As a further embodiment of the present invention: the other end of the sliding column cone is provided with a threaded hole for threaded connection with the locking bolt.

[0011] A method for pulling out the polyethylene liner of a scrapped oil pipe, the method comprising the following steps:

[0012] S1: Manually insert the first device into the lined oil pipe, support the sliding fixed sleeve, and pull the handle U-ring. Another steel wire rope can be threaded through the handle U-ring.

[0013] S2: The U-ring of the handle causes relative movement between the sliding cone and the sliding fixed sleeve, which causes the lower end of the barbed expansion tooth plate to expand inside the oil pipe and get stuck in the inner wall of the inner liner tube. The more it is pulled, the more intense the expansion becomes, causing the tooth to embed into the inner liner of the oil pipe until the inner liner tube is pulled out of the oil pipe.

[0014] S3: When the inner liner of the oil pipe is pulled out of the oil pipe by about 100mm, the inner liner loses its compressive force and expands after being pulled out of the oil pipe, causing the first device to detach from the inner liner, thus completing the first step of the inner liner's exit from the oil pipe.

[0015] S4: At this time, the second device is used again. The two tension support arms 13 of the second device are opened by manual means, and the inner liner tube head is inserted between the two inner liner locking rings.

[0016] S5: Tighten the wire rope, and the power is transmitted by the tension support arm to tighten the inner liner locking ring. Then, the built-in teeth inside the inner liner locking ring lock the outer wall of the inner liner tube. The winch pulls the wire rope to pull out the inner liner of the oil pipe, completing the pulling out operation of the entire scrapped inner liner oil pipe.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] This invention employs a first device in conjunction with a second device. The first device pulls out the inner liner tube a certain distance, and the second device pulls out the inner liner tube completely. This method is simple and practical, reduces labor intensity, improves labor efficiency, is unaffected by ambient temperature, and increases the safety factor of operation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the first device in this invention.

[0020] Figure 2 This is a side view of the sliding fixing sleeve in this invention.

[0021] Figure 3 This is a schematic diagram of the barbed expansion tooth plate in this invention.

[0022] Figure 4 This is a schematic diagram of the structure of the sliding column vertebra in this invention.

[0023] Figure 5 This is a schematic diagram of the structure of the second device in this invention.

[0024] Figure 6 This is a partial side view of the second device in this invention.

[0025] 1. Handle U-ring; 2. Fixing nut; 3. Locking bolt; 4. Sliding fixing sleeve; 5. Locking bolt; 6. Barbed expansion toothed plate; 7. Sliding column cone; 8. Mounting base; 9. Mounting block; 10. Threaded hole; 11. Through ring; 12. Steel wire rope; 13. Tension support arm; 14. Fixing bolt; 15. Inner liner locking ring; 16. First device; 17. Second device. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figures 1-6 In this embodiment of the invention, a device for pulling out the polyethylene lining of a waste oil pipe includes a first device 16 and a second device 17. The first device 16 includes a sliding column cone 7, one end of which is tapered. A sliding fixing sleeve 4 is slidably connected to the outer side of the sliding column cone 7. A plurality of mounting seats 8 are fixedly installed on one side of the sliding fixing sleeve 4 along the circumferential direction. Each mounting seat 8 has an insert block 9 inside, and a locking bolt 5 is provided on one side of each mounting seat 8. The insert block 9 is fixed to the mounting seat 8 by the locking bolt 5. A barbed tensioning tooth plate 6 is fixedly installed on one side of each insert block 9. The other end of the sliding column cone 7 is... The device 17 is provided with an external thread and is connected to a fixed nut 2 through the external thread. A handle U-ring 1 is fixedly installed on both sides of the fixed nut 2. The second device 17 includes two retractable support arms 13. A fixing bolt 14 is provided on one side of one of the retractable support arms 13. The fixing bolt 14 passes through both retractable support arms 13. The two retractable support arms 13 can rotate relative to each other through the fixing bolt 14. A through ring 11 is fixedly installed on one side of each of the two retractable support arms 13. A steel wire rope 12 is passed through the two through rings 11. An inner lining locking ring 15 is fixedly installed on the side of the other end of each of the two retractable support arms 13 that is close to each other.

[0028] A locking bolt 3 is provided on one side of the pull nut 2, and the pull nut 2 is fixed to the sliding column cone 7 by the locking bolt 3.

[0029] The first tooth is provided on the outer side of one end of the barbed tensioning tooth plate 6.

[0030] Both inner lining locking rings 15 are equipped with second teeth inside.

[0031] The other end of the sliding column cone 7 is provided with a threaded hole 10 for threaded connection with the locking bolt 3.

[0032] A method for pulling out the polyethylene liner of a scrapped oil pipe, the method comprising the following steps:

[0033] S1: Manually insert the first device into the lined oil pipe, support the sliding fixed sleeve, and pull the handle U-ring. Another steel wire rope can be threaded through the handle U-ring.

[0034] S2: The U-ring of the handle causes relative movement between the sliding cone and the sliding fixed sleeve, which causes the lower end of the barbed expansion tooth plate to expand inside the oil pipe and get stuck in the inner wall of the inner liner tube. The more it is pulled, the more intense the expansion becomes, causing the tooth to embed into the inner liner of the oil pipe until the inner liner tube is pulled out of the oil pipe.

[0035] S3: When the inner liner of the oil pipe is pulled out of the oil pipe by about 100mm, the inner liner loses its compressive force and expands after being pulled out of the oil pipe, causing the first device to detach from the inner liner, thus completing the first step of the inner liner's exit from the oil pipe.

[0036] S4: At this time, the second device is used again. The two tension support arms 13 of the second device are opened by manual means, and the inner liner tube head is inserted between the two inner liner locking rings.

[0037] S5: Tighten the wire rope, and the power is transmitted by the tension support arm to tighten the inner liner locking ring. Then, the built-in teeth inside the inner liner locking ring lock the outer wall of the inner liner tube. The winch pulls the wire rope to pull out the inner liner of the oil pipe, completing the pulling out operation of the entire scrapped inner liner oil pipe.

[0038] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for pulling out the polyethylene liner of a scrapped oil pipe, comprising a first device (16) and a second device (17), characterized in that: The first device (16) includes a sliding column cone (7), one end of which is tapered. A sliding fixing sleeve (4) is slidably connected to the outer side of the sliding column cone (7). Several mounting seats (8) are fixedly installed on one side of the sliding fixing sleeve (4) along the circumferential direction. Each mounting seat (8) is provided with an insert (9) inside. Each mounting seat (8) is provided with a locking bolt (5) on one side. The insert (9) is fixed to the mounting seat (8) by the locking bolt (5). A barbed expansion tooth plate (6) is fixedly installed on one side of each insert (9). The other end of the sliding column cone (7) is provided with an external thread and is connected to a fixing screw through the external thread. The mother (2) has a handle U-ring (1) fixedly installed on both sides of the fixed pull nut (2). The second device (17) includes two retractable support arms (13). One of the retractable support arms (13) is provided with a fixing bolt (14) on one side. The fixing bolt (14) passes through both retractable support arms (13). The two retractable support arms (13) can rotate relative to each other through the fixing bolt (14). One side of each of the two retractable support arms (13) is fixedly installed with a through ring (11). A steel wire rope (12) is passed through the two through rings (11). The other ends of the two retractable support arms (13) are fixedly installed with inner lining locking rings (15) on the side that is close to each other.

2. The device for pulling out the polyethylene liner of a scrapped oil pipe according to claim 1, characterized in that: A locking bolt (3) is provided on one side of the fixed pull nut (2), and the fixed pull nut (2) is fixed to the sliding column cone (7) by the locking bolt (3).

3. The device for pulling out the polyethylene liner of a scrapped oil pipe according to claim 1, characterized in that: The first tooth is provided on the outer side of one end of the barbed tensioning tooth plate (6).

4. The device for pulling out the polyethylene liner of a scrapped oil pipe according to claim 1, characterized in that: The two inner lining locking rings (15) are each provided with a second tooth inside.

5. The device for pulling out the polyethylene liner of a scrapped oil pipe according to claim 1, characterized in that: The other end of the sliding column cone (7) is provided with a threaded hole (10) for threaded connection with the locking bolt (3).

6. A method for pulling out the polyethylene liner of a scrapped oil pipe, using the apparatus described in claim 3, characterized in that, The method steps are as follows: S1: Manually insert the first device into the lined oil pipe, support the sliding fixed sleeve, and pull the handle U-ring. Another steel wire rope can be threaded through the handle U-ring. S2: The U-ring of the handle causes relative movement between the sliding cone and the sliding fixed sleeve, which causes the lower end of the barbed expansion tooth plate to expand inside the oil pipe and get stuck in the inner wall of the inner liner tube. The more it is pulled, the more intense the expansion becomes, causing the tooth to embed into the inner liner of the oil pipe until the inner liner tube is pulled out of the oil pipe. S3: When the inner liner of the oil pipe is pulled out of the oil pipe by about 100mm, the inner liner loses its compressive force and expands after being pulled out of the oil pipe, causing the first device to detach from the inner liner, thus completing the first step of the inner liner's exit from the oil pipe. S4: At this point, use the second device and manually open the two tension support arms of the second device. Then insert the inner liner tube head into the position between the two inner liner locking rings. S5: Tighten the wire rope, and the power is transmitted by the tension support arm to tighten the inner liner locking ring. Then, the built-in teeth inside the inner liner locking ring lock the outer wall of the inner liner tube. The winch pulls the wire rope to pull out the inner liner of the oil pipe, completing the pulling out operation of the entire scrapped inner liner oil pipe.

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