Oil well paraffin remover with self-cleaning scraping structure

Abstract

The utility model relates to a wax-preventer technical field, specifically is a kind of oil well wax-preventer with self-cleaning wax scraping structure, comprising: connecting oil pipe;Center tube, center tube is set in connecting oil pipe;Multiple connecting rods, three wax scraping mechanisms, the scheme is by using the flow energy of oil well liquid production itself as power source, drives wax scraping ring downlink, and energy is stored in spring, when liquid flow is intermittent or weak, spring releases energy and drives wax scraping ring reset, this "liquid energy-potential energy-kinetic energy" recycling, constitutes a complete reciprocating motion cycle without external power, realizes the continuous automatic wax scraping, and different from the device that can only scrape wax in one direction, wax scraping ring of the device performs wax scraping operation in downlink and uplink two strokes, this not only doubles wax scraping frequency, more effectively removes wax attachment in different directions, forms dead-angle-free three-dimensional cleaning to connecting oil pipe inner wall and center tube outer wall, and wax-preventer efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of wax preventers, and in particular to an oil well wax preventer with a self-cleaning wax scraping structure. Background Technology

[0002] In oilfield development, wax deposition in wells is a common technical problem affecting crude oil production. As crude oil flows from the formation to the wellhead, due to the continuous decrease in temperature and pressure, the paraffin components dissolved in the crude oil gradually reach saturation, subsequently precipitating, depositing, and accumulating on the inner wall of the tubing. This wax deposition phenomenon leads to a continuous reduction in the effective flow area of ​​the oil channel, significantly increasing oil flow resistance, increasing the workload of the pumping unit, and also causing abnormal operation of downhole equipment. When the wax deposition is severe, it can even completely block the tubing channel, causing the well to shut down and resulting in serious economic losses to oilfield production.

[0003] To address this problem, existing technologies generally employ mechanical wax removal. Most wax scrapers only have a unidirectional motion, scraping wax downwards, and do not produce a scraping effect during the reset stroke. This results in wax deposits still being deposited on the tube wall during the wax removal cycle, leading to discontinuous and incomplete wax removal. Furthermore, there is a lack of effective cleaning methods for complex flow channels inside the tool, such as the central tube and inner wall where wax has accumulated.

[0004] Therefore, an oil well anti-wax device with a self-cleaning wax scraping structure is proposed to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide an oil well wax preventer with a self-cleaning wax scraping structure to solve the above-mentioned problems. This improves upon the fact that oil well wax preventers with a self-cleaning wax scraping structure only move in one direction, scraping wax downwards, and do not produce a scraping effect during the reset stroke. This results in wax deposition on the pipe wall during the wax removal cycle, leading to discontinuous and incomplete wax removal. At the same time, there is a lack of effective cleaning methods for complex flow channels inside the tool, such as the central pipe and inner wall where wax has accumulated.

[0006] This utility model achieves the above-mentioned objective through the following technical solution: an oil well anti-wax device with a self-cleaning wax scraping structure, comprising: Connect the oil pipe; A central tube, wherein the central tube is disposed within the connecting oil pipe; Multiple connecting rods, one end of each connecting rod is fixedly connected to the inner circumferential wall of the connecting oil pipe, and the other end of each connecting rod is fixedly connected to the circumferential surface of the central pipe. Three wax scraping mechanisms are provided. Each wax scraping mechanism includes a first fixing block, a spring, a wax scraping ring, a semi-annular oil passage, a second fixing block, a support rod, and a semi-annular scraper. Two first fixing blocks, springs, semi-annular oil passages, and semi-annular scrapers are provided. Multiple second fixing blocks and support rods are provided. One end of each of the two first fixing blocks is fixedly connected to the inner circumference of the connecting oil pipe, and the other end of each of the two first fixing blocks is fixedly connected to the circumference of the central tube. One end of each of the two springs is fixedly connected to the upper end of each of the two first fixing blocks. The wax scraping ring is fixedly connected to two springs. At the other end, the circumferential surface of the wax scraper ring is attached to the inner circumferential wall of the connecting oil pipe, the wax scraper ring is slidably connected to the circumferential surface of the central tube, the two semi-annular oil passage holes are respectively opened at the upper end of the wax scraper ring, one end of each of the plurality of second fixing blocks is respectively fixedly connected to the inner circumferential wall of the connecting oil pipe, the other end of each of the plurality of second fixing blocks is respectively fixedly connected to the circumferential surface of the central tube, the plurality of support rods are respectively fixedly connected to the upper ends of the plurality of second fixing blocks, the two semi-annular scrapers are respectively fixedly connected to the upper ends of the plurality of support rods, and the two semi-annular scrapers and the two semi-annular oil passage holes are matched.

[0007] Preferably, two stabilizing grooves are respectively formed on the inner circumference of the connecting oil pipe, and two stabilizing blocks are fixedly connected to the circumferential surface of each wax scraper ring, and multiple stabilizing blocks are slidably connected in the two stabilizing grooves.

[0008] Preferably, two connecting flanges are fixedly connected to the upper and lower ends of the connecting oil pipe, and multiple mounting holes are respectively opened on the surface of the two connecting flanges.

[0009] Preferably, two gaskets are fixedly connected to the inner circumferential walls of the two connecting flanges, and the two gaskets are made of rubber.

[0010] Preferably, both springs are covered with anti-wax tubing.

[0011] Preferably, a spiral guide vane is fixedly connected to the inner circumference of the central tube, and the spiral guide vane is axially distributed on the inner circumference of the central tube.

[0012] Preferably, the material of the central tube is alloy steel for oil casing.

[0013] The beneficial effects of this utility model are: 1. This solution utilizes the flow energy of the oil well's produced fluid as a power source to drive the wax scraping ring downwards and stores the energy in a spring. When the fluid flow is intermittent or weakened, the spring releases energy to drive the wax scraping ring to reset. This "liquid energy-potential energy-kinetic energy" cycle constitutes a complete reciprocating motion cycle without external power, achieving continuous automatic wax scraping. Unlike devices that can only scrape wax in one direction, the wax scraping ring of this device performs wax scraping operations in both the downward and upward strokes. This not only doubles the wax scraping frequency but also effectively removes wax deposits in different directions, forming a three-dimensional cleaning without dead angles on the inner wall of the connecting tubing and the outer wall of the central tube, significantly improving the wax prevention efficiency.

[0014] 2. This solution uses a semi-circular scraper fixed to the upper end of the support rod to work in conjunction with a semi-circular oil passage. It can actively scrape away wax debris and impurities that try to pass through, acting like a "built-in cleaner". This fundamentally prevents the risk of the oil passage being blocked by wax blocks, ensuring the long-term unobstructed flow of liquid and the continuous function of the device. Attached Figure Description

[0015] Figure 1 This is a front perspective view of the present invention; Figure 2 This is a first sectional view of the present invention; Figure 3 This is an exploded view of the present invention; Figure 4 This is a second sectional view of the present invention.

[0016] In the diagram: 1. Connecting oil pipe; 2. Central pipe; 3. Connecting rod; 4. First fixing block; 5. Spring; 6. Wax scraper ring; 7. Semi-annular oil passage hole; 8. Second fixing block; 9. Support rod; 10. Semi-annular scraper blade; 11. Stabilizing groove; 12. Stabilizing block; 13. Connecting flange; 14. Mounting hole; 15. Gasket; 16. Spiral guide vane. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0018] Please see Figures 1-4 The present invention provides the following technical solution: An oil well wax preventer with a self-cleaning wax scraping structure includes: Connect oil pipe 1; Central pipe 2, which is installed inside the connecting oil pipe 1; Multiple connecting rods 3, one end of each connecting rod 3 is fixedly connected to the inner circumferential wall of the connecting oil pipe 1, and the other end of each connecting rod 3 is fixedly connected to the circumferential surface of the central pipe 2. Three wax scraping mechanisms are provided. Each wax scraping mechanism includes a first fixing block 4, a spring 5, a wax scraping ring 6, a semi-annular oil passage hole 7, a second fixing block 8, a support rod 9, and a semi-annular scraper blade 10. There are two first fixing blocks 4, two springs 5, two semi-annular oil passage holes 7, and two semi-annular scraper blades 10. There are multiple second fixing blocks 8 and support rods 9. One end of each of the two first fixing blocks 4 is fixedly connected to the inner circumference of the connecting oil pipe 1, and the other end of each of the two first fixing blocks 4 is fixedly connected to the circumference of the central pipe 2. One end of each of the two springs 5 ​​is fixedly connected to the upper end of each of the two first fixing blocks 4. The wax scraping ring 6 is fixedly connected to both... At the other end of the spring 5, the circumferential surface of the wax scraper ring 6 is attached to the inner circumferential wall of the connecting oil pipe 1. The wax scraper ring 6 is slidably connected to the circumferential surface of the central tube 2. Two semi-annular oil passage holes 7 are respectively opened at the upper end of the wax scraper ring 6. One end of each of the multiple second fixing blocks 8 is respectively fixedly connected to the inner circumferential wall of the connecting oil pipe 1. The other end of each of the multiple second fixing blocks 8 is respectively fixedly connected to the circumferential surface of the central tube 2. Multiple support rods 9 are respectively fixedly connected to the upper ends of the multiple second fixing blocks 8. Two semi-annular scraper blades 10 are respectively fixedly connected to the upper ends of the multiple support rods 9. The two semi-annular scraper blades 10 and the two semi-annular oil passage holes 7 are matched.

[0019] In a specific embodiment of this utility model, when the oil well fluid flows downward from above the device, the fluid flow impacts and pushes the wax scraping ring 6 downward. The two springs 5 ​​fixed to the wax scraping ring 6 are compressed, storing elastic potential energy. At the same time, the wax scraping ring 6 slides downward along the circumferential surface of the central tube 2, scraping off the wax deposits on the outer circumference of the central tube 2. Simultaneously, its circumferential surface rubs against the inner circumferential wall of the connecting oil pipe 1, scraping off the wax deposits adhering to the inner wall of the connecting oil pipe 1. When the impact force of the fluid flow weakens or disappears, the two compressed springs 5 ​​release their elastic potential energy, driving the wax scraping ring 6 to return to its original position. When the wax scraping ring 6 moves upward under the drive of the springs 5, it can... The wax deposits on the inner wall of the connecting oil pipe 1 are scraped off automatically, and the liquid can pass through the two semi-annular oil passages 7 opened at the upper end of the wax scraping ring 6. The central tube 2 is stably supported inside the connecting oil pipe 1 by the fixed connection of multiple connecting rods 3, the first fixing block 4 and the second fixing block 8. When the wax scraping ring 6 reciprocates, the two semi-annular scraper blades 10 fixed at the upper end of multiple support rods 9 cooperate with the two semi-annular oil passages 7. When wax chips or impurities pass through the semi-annular oil passages 7 with the liquid flow, the semi-annular scraper blades 10 can scrape them, preventing the semi-annular oil passages 7 from being completely blocked, and ensuring the long-term effectiveness of the semi-annular oil passages 7.

[0020] Please refer to the details. Figures 1-4 Two stabilizing grooves 11 are respectively opened on the inner circumference of the connecting oil pipe 1, and two stabilizing blocks 12 are fixedly connected to the circumferential surface of each wax scraper ring 6. Multiple stabilizing blocks 12 are slidably connected in the two stabilizing grooves 11.

[0021] In this embodiment: when the wax remover is working in the oil well, the produced fluid flows downward from above the device, and the fluid flow pushes the wax scraping ring 6 to move. The multiple stabilizing blocks 12 fixed on the circumferential surface of the wax scraping ring 6 slide in the two stabilizing grooves 11 opened on the inner wall of the connecting oil pipe 1. When the wax scraping ring 6 is subjected to unbalanced lateral force, the cooperation between the stabilizing blocks 12 and the stabilizing grooves 11 strictly limits the running trajectory of the wax scraping ring 6 when it reciprocates, preventing the wax scraping ring 6 from deflecting or getting stuck, and ensuring the continuous wax scraping operation.

[0022] Please refer to the details. Figures 1-4 Two connecting flanges 13 are fixedly connected to the upper and lower ends of the connecting oil pipe 1, and multiple mounting holes 14 are opened on the surface of the two connecting flanges 13 respectively.

[0023] In this embodiment: when the wax inhibitor needs to be connected to the tubing system, the operator uses bolts to pass through the multiple mounting holes 14 opened on the surfaces of the two connecting flanges 13 that are fixedly connected to the upper and lower ends of the connecting tubing 1, so that the wax inhibitor can be firmly connected to the upstream and downstream tubing. It should be noted that the connecting flange 13 at the upper end of the connecting tubing 1 in this solution is connected to the downstream tubing on site, so this solution is installed in reverse when in use.

[0024] Please refer to the details. Figures 1-4 Two gaskets 15 are fixedly connected to the inner circumference of the two connecting flanges 13, and the two gaskets 15 are made of rubber.

[0025] In this embodiment: when the device is connected and put into operation, the produced fluid flows through the flange connection. When the fluid flows through, the two gaskets 15 fixedly connected to the inner circumference of the two connecting flanges 13 play a role. When there is vibration in the pipeline or connection gap, the rubber gaskets 15 undergo elastic deformation, effectively sealing the connection gap and preventing well fluid leakage at this point.

[0026] Please refer to the details. Figures 1-4 Both springs 5 ​​are fitted with anti-wax rubber tubes.

[0027] In this embodiment: when the wax-rich well fluid flows through the inside of the device, the wax may precipitate and adhere. The anti-wax rubber tube sleeved on the outside of the two springs 5 ​​isolates the spiral gap of the springs 5 ​​from the well fluid. When the wax is deposited on the outer surface of the anti-wax rubber tube, due to the overall smooth surface and elasticity of the anti-wax rubber tube, when the wax scraping ring 6 reciprocates and drives the springs 5 ​​to extend and retract, the anti-wax rubber tube deforms accordingly. The deposited wax layer on its surface is more likely to break and fall off due to poor adhesion, thereby effectively preventing the wax from penetrating into the inside of the springs 5 ​​and solidifying there, thus ensuring the reset function of the springs 5.

[0028] Please refer to the details. Figures 1-4 A spiral guide vane 16 is fixedly connected to the inner circumference of the central tube 2, and the spiral guide vane 16 is axially distributed on the inner circumference of the central tube 2.

[0029] In this embodiment: when the well fluid flows from top to bottom into the internal channel of the central pipe 2, the spiral guide vane 16 fixedly connected to the inner circumference of the central pipe 2 applies a rotational force to the fluid flow. When the fluid flow forms a spiral vortex under the guidance of the spiral guide vane 16, a stronger radial shear force is generated when the fluid flow rotates forward. This force can effectively scour the inner wall of the central pipe 2 and inhibit the deposition and adhesion of wax crystals on the inner wall of the central pipe 2.

[0030] Please refer to the details. Figures 1-4 The material of the central tube 2 is alloy steel for oil casing.

[0031] In this embodiment: when the wax preventer is subjected to high pressure and corrosive media downhole, the alloy steel material used to manufacture the central tube 2 for oil casing plays a role. When the pressure inside the well acts on the wall of the central tube 2 and the corrosive media comes into contact with its surface, due to the characteristics of its material, the central tube 2 can maintain the integrity of its structure and the reliability of its strength, ensuring the long service life of the entire wax preventer under harsh well conditions.

[0032] Workflow: By bolting through multiple mounting holes 14 on the surfaces of the two connecting flanges 13 at the upper and lower ends of the connecting tubing 1, the wax remover can be securely connected to the upstream and downstream tubing. When the well fluid flows downward from above the device, the fluid flow first impacts the wax scraping ring 6, applying a downward force to it. The fluid flow thrust pushes the wax scraping ring 6 downward along the outer circumference of the central tube 2. The two springs 5 ​​fixed to the wax scraping ring 6 are thus compressed, storing elastic potential energy. During the downward movement, the inner edge of the wax scraping ring 6 scrapes off the wax deposits on the outer circumference of the central tube 2. The outer circumference surface of the wax scraping ring 6 rubs against the inner circumference of the connecting tubing 1, scraping off the wax deposits attached there. As the wax scraping ring 6 moves downward, the stabilizing block 12 fixed to its circumference slides synchronously within the stabilizing groove 11 on the inner wall of the connecting tubing 1. This cooperation effectively prevents the wax scraping ring 6 from slipping during movement. In case of deflection or jamming, ensure stable operation along a straight line. The liquid flow can pass through the semi-annular oil passage 7 at the upper end of the wax scraper ring 6. Here, the semi-annular scraper 10 fixed to the upper end of the support rod 9 cooperates with the semi-annular oil passage 7 to scrape the wax chips or impurities that pass through with the liquid flow, preventing the oil passage from being completely blocked and ensuring its long-term effectiveness. The liquid flow into the interior of the central tube 2 is guided by the spiral guide plate 16 fixedly connected to its circumferential inner wall to form a vortex. This vortex generates a stronger radial shear force, effectively flushing the inner wall of the central tube 2 and inhibiting the deposition of wax crystals. When the impact force of the liquid flow weakens or disappears, the two compressed springs 5 ​​release their stored elastic potential energy, driving the wax scraper ring 6 to move upward. During the upward reset process of the wax scraper ring 6, it will also scrape the wax on the inner wall of the connecting oil pipe 1 and the outer wall of the central tube 2 again, thereby realizing automatic and reciprocating wax scraping operation.

[0033] All standard parts used in this invention can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control method is automatic control through the control unit. The control circuit of the control unit can be implemented by simple programming by those skilled in the art, which is common knowledge in the field. Therefore, the control method and circuit connection will not be explained in detail in this invention.

[0034] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific implementation methods described. The present specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present utility model, so that those skilled in the art can better understand and utilize the present utility model.

Claims

1. An oil well anti-wax device with a self-cleaning wax scraping structure, characterized in that, include: Connect the oil pipe (1); The central tube (2) is disposed inside the connecting oil pipe (1); Multiple connecting rods (3), one end of each of the multiple connecting rods (3) is fixedly connected to the inner circumferential wall of the connecting oil pipe (1), and the other end of each of the multiple connecting rods (3) is fixedly connected to the circumferential surface of the central pipe (2); Three wax scraping mechanisms, each of which includes a first fixing block (4), a spring (5), a wax scraping ring (6), a semi-annular oil passage hole (7), a second fixing block (8), a support rod (9), and a semi-annular scraper (10). There are two first fixing blocks (4), springs (5), semi-annular oil passage holes (7), and semi-annular scrapers (10). There are multiple second fixing blocks (8) and support rods (9). One end of each of the two first fixing blocks (4) is fixedly connected to the inner circumference of the connecting oil pipe (1), and the other end of each of the two first fixing blocks (4) is fixedly connected to the circumference of the central tube (2). One end of each of the two springs (5) is fixedly connected to the upper end of each of the two first fixing blocks (4). The wax scraping ring (6) is fixedly connected to... At the other end of the two springs (5), the circumferential surface of the wax scraper ring (6) is attached to the inner circumferential wall of the connecting oil pipe (1), the wax scraper ring (6) is slidably connected to the circumferential surface of the central tube (2), the two semi-annular oil passage holes (7) are respectively opened at the upper end of the wax scraper ring (6), one end of the plurality of second fixing blocks (8) is respectively fixedly connected to the inner circumferential wall of the connecting oil pipe (1), the other end of the plurality of second fixing blocks (8) is respectively fixedly connected to the circumferential surface of the central tube (2), the plurality of support rods (9) are respectively fixedly connected to the upper end of the plurality of second fixing blocks (8), the two semi-annular scraper blades (10) are respectively fixedly connected to the upper end of the plurality of support rods (9), and the two semi-annular scraper blades (10) and the two semi-annular oil passage holes (7) are matched.

2. The oil well wax preventer with a self-cleaning wax scraping structure according to claim 1, characterized in that: Two stabilizing grooves (11) are respectively opened on the inner circumference of the connecting oil pipe (1), and two stabilizing blocks (12) are fixedly connected to the circumferential surface of each of the wax scraping rings (6), and multiple stabilizing blocks (12) are slidably connected in the two stabilizing grooves (11).

3. The oil well wax preventer with a self-cleaning wax scraping structure according to claim 2, characterized in that: The upper and lower ends of the connecting oil pipe (1) are respectively fixedly connected to two connecting flanges (13), and the surfaces of the two connecting flanges (13) are respectively provided with multiple mounting holes (14).

4. The oil well wax preventer with a self-cleaning wax scraping structure according to claim 3, characterized in that: Two gaskets (15) are fixedly connected to the inner circumference of the two connecting flanges (13), and the two gaskets (15) are made of rubber.

5. The oil well wax preventer with a self-cleaning wax scraping structure according to claim 4, characterized in that: Both springs (5) are fitted with anti-wax rubber tubes.

6. The oil well wax preventer with a self-cleaning wax scraping structure according to claim 5, characterized in that: A spiral guide vane (16) is fixedly connected to the inner circumference of the central tube (2), and the spiral guide vane (16) is axially distributed on the inner circumference of the central tube (2).

7. The oil well wax preventer with a self-cleaning wax scraping structure according to claim 6, characterized in that: The material of the central tube (2) is alloy steel for oil casing.

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