Chemical antifouling and scale preventing device with bamboo tube and spiral progressive type

Abstract

The bamboo tube spiral progressive chemical paraffin and scale preventing device belongs to oil field production equipment, and is provided with an oil pumping pipe in the well tube of an oil well, the lower end of the oil pumping pipe is connected with an oil pumping cylinder, the oil pumping cylinder is provided with an oil pumping machine, the upper end of the oil pumping machine is connected with the lower end of an oil pumping rod, the upper end of the oil pumping rod is connected with a well head motor, the lower end of the oil pumping machine is provided with a one-way valve, the lower end of the one-way valve is connected with a screen pipe II, the lower end of the oil pumping cylinder is connected with an outer collected liquid cylinder, the lower end of the outer collected liquid cylinder is connected with a screen pipe I; an inner spiral flow working cylinder is arranged in the outer collected liquid cylinder, and a chemical agent block is arranged in the inner spiral flow working cylinder. The device changes the original paraffin and scale removing mode, realizes the functions of long-term paraffin preventing and long-acting scale preventing of the well tube lifting production, realizes the functions of automatic slow release and progressive supply of the paraffin and scale preventing agent, can effectively protect the well tube casing, prolongs the production operation cycle, fundamentally solves the production failure of the oil production well, reduces the cost, and increases the liquid production of the production well.

Description

Technical Field

[0001] This invention relates to equipment for oilfield production, and particularly to a bamboo tube spiral progressive chemical anti-wax and anti-scaling device. Background Technology

[0002] During oilfield production operations, calcium and magnesium ions precipitate from the fluid injected into production gathering and transportation pipelines and water injection wells, adhering to the inner walls of the pipelines and reducing water flow capacity. Simultaneously, scale deposits from the injected water can adhere to the perforation end faces, causing blockages. Furthermore, during the lifting process in the pumping wellbore, the precipitated crude oil fluid forms wax and scale, which can easily become stuck in the pump barrel, increasing pipe resistance, sucker rod stress, and pumping unit energy consumption. This leads to difficulties in transporting the lifted crude oil and pumping unit shutdowns, ultimately failing to meet oil production and development needs. Solving this problem requires removing the entire wellbore tubing; however, this method is costly, carries significant safety risks, and poses a high risk of environmental pollution. To address these issues, most current methods involve injecting chemical anti-scaling and dewaxing agents into the annulus between the gathering and transportation pipeline and the downhole casing and well casing to prevent scale precipitation. However, this method has drawbacks, such as the agent's direct and rapid contact with the casing wall causing long-term corrosion and premature casing damage. In addition, there are issues with precise dosage, lack of long-lasting anti-scaling and dewaxing effects, high investment costs, and high production costs. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a bamboo tube spiral progressive chemical anti-wax and anti-scaling device.

[0004] The bamboo tube spiral progressive chemical anti-wax and anti-scaling device of the present invention has an oil pump pipe installed inside the oil well barrel. The lower end of the oil pump pipe is connected to the oil pump cylinder, and the oil pump is installed inside the oil pump cylinder. The upper end of the oil pump is fixedly connected to the lower end of the sucker rod. The upper end of the sucker rod is fixedly connected to the output end of the wellhead motor. A one-way valve is installed at the lower end of the oil pump, and the lower end of the one-way valve is connected to the screen pipe II. The lower end of the oil pump cylinder is connected to the outer collection liquid cylinder, and the lower end of the outer collection liquid cylinder is connected to the screen pipe I. An inner swirling working cylinder is coaxially installed inside the outer collection liquid cylinder, and an annular gap is formed between the two. The inner swirling working cylinder is composed of an outlet collector and an inlet swirling device fixed at the upper and lower ends of a central tube, respectively. Solid chemical agent blocks are stacked sequentially inside the inner swirling working cylinder.

[0005] As a further improvement of the present invention, the central tube body is composed of one or more graphene composite steel pipes II connected sequentially from top to bottom by pipe couplings II, with an outlet collector threaded to the upper end and an inlet cyclone disperser threaded to the lower end.

[0006] As a further improvement of the present invention, a baffle is fixed at the top of the central tube, and a one-way piston valve is provided on the baffle.

[0007] As a further improvement of the present invention, the liquid inlet cyclone is composed of multiple elongated liquid outlets evenly arranged around the outer wall of a pipe section, and the liquid outlet collector is composed of multiple elongated liquid inlet ports evenly arranged around the outer wall of a pipe section.

[0008] As a further improvement of the present invention, the lower end of the sucker pipe is connected to an upper conversion connector, which is composed of a circular pipe I with an integrally formed annular plate I connected to the lower end of the pipe. The upper end of the circular pipe I is threaded to the lower end of the sucker pipe, and the outer edge of the annular plate I sits on the upper opening of the outer collecting liquid cylinder and is threaded to it through a pipe coupling I. The lower end of the outer collecting liquid cylinder is connected to a lower conversion connector, which is composed of a circular pipe II with an integrally formed expansion pipe connected to the upper end of the pipe. The upper end of the expansion pipe is fitted onto the lower end of the outer collecting liquid cylinder and is threaded to it. The lower end of the circular pipe II is threaded to the screen pipe I. The upper and lower ends of the inner vortex working cylinder are respectively placed on the shoulders of the annular plate I and the expansion pipe.

[0009] As a further improvement of the present invention, the external collection liquid cylinder is composed of one or more graphene composite steel pipes I connected sequentially from top to bottom by pipe couplings I.

[0010] As a further improvement of the present invention, a bearing end plate is provided at the outlet of the circular tube II, and a liquid inlet hole is provided on the bearing end plate. A support mandrel is provided at the center of the upper end of the bearing end plate, and the support mandrel is slightly higher than the liquid inlet cyclone disperser.

[0011] As a further improvement of the present invention, a limiting ring is fixed to the inner wall of the lower opening of the outer liquid collection cylinder, the horizontal edge of the bearing end plate is seated on the shoulder of the expansion tube and extends vertically upward to be positioned on the limiting block, and the lower opening of the liquid inlet cyclone is seated on the horizontal edge of the bearing end plate and closely cooperates with its vertical section.

[0012] As a further improvement of the present invention, the upper port seat of the liquid outlet collector has a stepped clamping end plate, the upper conversion connector clamps the stepped clamping end plate, and is firmly connected by the pipe coupling I thread; a sealing ring I is provided below the stepped clamping end plate, between the upper outer wall of the liquid outlet collector and the upper inner wall of the outer liquid collection cylinder.

[0013] As a further improvement of the present invention, the solid chemical reagent block is a circular block with a spiral groove around its circumference and a shaft hole in the center. An extended isolation block integral with the shaft hole is provided at the lower end of the shaft hole.

[0014] This invention relates to a bamboo-tube spiral progressive chemical anti-wax and anti-scaling device. Its rational structural design changes the traditional method of surface-applying liquid chemical anti-wax and anti-scaling agents, achieving long-lasting anti-wax and anti-scaling effects during wellbore lifting production. It features automatic, slow-release delivery of the anti-wax and anti-scaling agent dosage, progressively supplying solid agent blocks. The design of the outer collection cylinder and inner swirling working cylinder ensures that the chemical agent release reaction process does not directly contact and corrode the wellbore casing wall. The agent is released and reacts within the newly added quantitative liquid inlet swirling device, effectively protecting the wellbore casing and achieving long-term anti-sticking and unblocking operations, extending the production cycle. It fundamentally solves the production failures of oil wells caused by wax and scale jamming the pump, significantly reducing the cost of oilfield crude oil lifting and extraction, addressing the high environmental pollution and safety risks, and effectively resolving the localized casing corrosion losses caused by direct agent corrosion damage to the original production casing. This increases the production volume of production wells and achieves significant economic benefits. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the structure of the present invention; Figure 2 This is a cross-sectional view of the solid chemical reagent block structure of the present invention; Figure 3 This is a schematic diagram of the load-bearing end plate structure of the present invention. Implementation

[0016] The bamboo tube spiral progressive chemical anti-wax and anti-scaling device of the present invention has an oil well tube 4 installed inside the oil well barrel 1. The lower end of the oil well tube 4 is connected to the oil pump barrel 34. The oil pump barrel 34 is equipped with an oil pump 5. The upper end of the oil pump 5 is fixedly connected to the lower end of the sucker rod 6. An oil production tree 2 is fixed at the upper end of the oil well barrel 1. A wellhead motor 3 is fixed at the upper end of the oil production tree 2. The upper end of the sucker rod 6 is fixedly connected to the output end of the wellhead motor 3. A one-way valve 7 is provided at the lower end of the oil pump 5. The lower end of the one-way valve 7 is connected to the screen pipe II 8.

[0017] The lower end of the oil pump cylinder 34 is connected to an upper conversion connector. The upper conversion connector is composed of a circular tube I9 with an integral annular plate I25 connected to the lower end of the tube. The upper end of the circular tube I9 is ​​threaded to the lower end of the oil pump cylinder 34. The outer edge of the annular plate I25 sits on the upper opening of the outer collection liquid cylinder 10 and is threaded to it through a pipe coupling I. The outer collection liquid cylinder 10 is composed of one or more graphene composite steel pipes I15 connected sequentially from top to bottom through pipe couplings I. The lower end of the cylinder is connected to a lower conversion connector. The lower conversion connector is composed of a circular tube II13 with an integrally formed expansion tube 26 connected to the upper end of the tube. The upper end of the expansion tube 26 is fitted onto the lower end of the outer collection liquid cylinder 10 and is threaded to it. The lower end of the circular tube II13 is threaded to a screen tube I14.

[0018] An inner swirling working cylinder 11 is coaxially arranged inside the outer liquid collection cylinder 10, forming an annular gap 22 between the two. The inner swirling working cylinder 11 is composed of an outlet collector 17 and an inlet swirling device 18 fixed at the upper and lower ends of a central tube 23, respectively. Specifically, the central tube 23 is composed of one or more graphene composite steel pipes II 16 connected sequentially from top to bottom by pipe couplings II. The outlet collector 17 is threadedly connected to the upper end, and the inlet swirling device 18 is threadedly connected to the lower end. The heights of the graphene composite steel pipe II 16, the liquid outlet collector 17, and the liquid inlet cyclone disperser 18 are all the same. The liquid outlet collector 17 is composed of multiple elongated liquid inlets evenly arranged around the outer wall of a pipe section, and the liquid inlet cyclone disperser 18 is composed of multiple elongated liquid outlets evenly arranged around the outer wall of a pipe section. The upper end of the liquid outlet collector 17 is placed on the shoulder of the annular plate I 25, and the lower end of the liquid inlet cyclone disperser 18 is placed on the shoulder of the expansion pipe 26.

[0019] A baffle 24 is fixed to the top of the central tube 23. Below the baffle 24, within the inner swirling working cylinder 11, stacked solid chemical agent blocks 12 are arranged sequentially. These solid chemical agent blocks 12 are made of anti-wax and anti-scaling agents, which are existing technology and commercially available. Each solid chemical agent block 12 has a spiral cylindrical structure with spiral grooves 29 around its circumference and a central shaft hole 30. An extended isolation block 31, integral with the shaft hole 30, is located at the lower end of the shaft hole 30. When multiple solid chemical agent blocks 12 are stacked, the isolation block 31 of the previous block 12 is placed within the shaft hole 30 of the next block 12, forming a spiral bamboo-joint structure. The height of each solid chemical agent block 12 is the same as the height of the inlet swirler 18.

[0020] A bearing end plate 21 is provided at the outlet of the circular tube II 13. The bearing end plate 21 is a flat plate, an arc-shaped end plate, or a conical plate, and has a liquid inlet hole. A support mandrel 28 is provided at the center of the upper end of the bearing end plate 21. The support mandrel 28 is slightly higher than the liquid inlet cyclone disperser 18. Since the support mandrel 28 is slightly higher than the solid chemical agent block 12, when the bottom solid chemical agent block 12 is fitted onto the support mandrel 28, the isolation block 31 of the upper solid chemical agent block 12 is placed at the top of the support mandrel 28, so that the two solid chemical agent blocks 12 do not contact each other. This ensures that the bottom solid chemical agent block 12 can rotate and dissolve freely under the action of the fluid. At the same time, under the impact of the liquid, the isolation block 31 of the solid chemical agent block 12 at the top of the support mandrel 28 also dissolves. It dissolves at approximately the same time as the bottom solid chemical agent block 12. After the bottom solid chemical agent block 12 dissolves, the previous solid chemical agent block 12 falls down along the support spindle 28. The support spindle 28 supports the solid chemical agent block 12 and cooperates with the rotation and dissolution of the solid chemical agent block 12. After the first solid chemical agent block 12 at the bottom has dissolved after a fixed time period of chemical reaction, the second solid chemical agent block 12 moves down in succession. After the solid chemical agent block 12 has dissolved after chemical reaction in the liquid inlet cyclone separator 18, the third solid chemical agent block 12 continues to move down in succession. This achieves accurate segmented and individual control of the bamboo-joint chemical anti-wax and anti-scaling solid blocks as they move downwards, achieving segmented dynamic dispersion and uniform contact with liquid oil and water fluid, and achieving long-lasting anti-wax and anti-scaling function. The individual movement is achieved by utilizing the fluid flow force, the suction kinetic energy of the oil pump 5, and the gravity of the solid chemical agent block 12.

[0021] In order to ensure that the solid chemical reagent blocks 12 fall smoothly in sequence, a one-way piston valve 19 is provided on the baffle 24. When the solid chemical reagent blocks 12 below dissolve, the solid chemical reagent blocks 12 fall in sequence. At this time, the liquid in the liquid collector 17 flows into the central tube 23 through the one-way valve on the baffle 24, giving the solid chemical reagent blocks 12 a force to move them down and ensure that they fall smoothly.

[0022] To increase the stability and sealing of the inner swirling working cylinder 11, a limiting ring 27 is fixed to the inner wall of the lower opening of the outer liquid collecting cylinder 10 at the lower end. The horizontal edge of the bearing end plate 21 sits on the shoulder of the expanding pipe 26 and extends vertically upward to be positioned on the limiting block 27. The lower opening of the liquid inlet swirler 18 sits on the horizontal edge of the bearing end plate 21 and fits tightly with its vertical section. A lower sealing element is provided between the outer wall of the liquid inlet swirler 18 and the inner wall of the vertical section of the bearing end plate 21 to seal the lower end of the annular gap 22. Sealing; at the upper end, there is an annular stepped clamping end plate 20 at the upper port seat of the liquid outlet collector 17. While clamping the liquid outlet collector 17, the outer end of the clamping end plate 20 is placed between the outer liquid collection cylinder 10 and the inner swirling working cylinder 11, fixing the two relative to each other; the upper conversion connector clamps the stepped clamping end plate 20 and is firmly connected by the pipe coupling I thread; below the stepped clamping end plate 20, a sealing ring I 32 is provided between the upper outer wall of the liquid outlet collector 17 and the upper inner wall of the outer liquid collection cylinder 10 to seal the upper end of the annular gap 22.

[0023] The working principle of this invention: Under the kinetic energy of the rotating sucker rod 6 and the rotating oil pump 5, the fluid in the well casing flows from the inside of the well casing annulus 33 along the fluid direction. First, it passes through the sand screen tube I 14 to filter out some large impurities. Then, the fluid enters the bottom of the inlet hydrocyclone 18 and contacts the bottom solid chemical agent block 12. Under the action of fluid force, the bamboo-joint solid chemical agent block 12 rotates spirally, realizing the uniform dispersion of the fluid. After the chemical reaction, the molecular core characteristics of the fluid are changed, and substances such as calcium, magnesium, and iron in the transported liquid are no longer generated. Then, it enters the annular gap 22 formed between the graphene new material inner hydrocyclone working cylinder 11 and the outer collection liquid cylinder 10. The fluid continues to flow and enters the oil pump cylinder 34 from the outlet collector 17. It is then lifted into the oil pipe 4 by the oil pump 5.

[0024] The solid chemical agent block 12 of this application can be designed as a chemical solid agent block with slow-release function, realizing long-term chemical effect of fluid in the inlet cyclone disperser 18. During the contact with the fluid, it causes chemical molecular structure reaction, changes its molecular core characteristics, and makes it free from intermolecular forces. It makes the attraction and association ability of molecules in the liquid oil-water fluid mixture disappear, which can accurately prevent the adsorption and precipitation of scale in the oil pump and oil pipe, thereby achieving the effect of wax prevention and scale removal. Calcium, magnesium, iron and other substances in the transported liquid will not be generated, and will not form wax or scale blockage on the inner wall of the pipeline. It achieves time-sharing slow-release quantitative chemical wax and scale prevention, precise proportional dosage chemical wax and scale prevention, and extended time cycle chemical wax and scale prevention. It realizes the smooth transportation of crude oil fluid and achieves the purpose of sand prevention, wax prevention, scale prevention, viscosity reduction and unblocking.

Claims

1. A bamboo tube spiral progressive chemical anti-wax and anti-scaling device is provided in an oil well barrel (1) with a sucker pipe (4) inside. The lower end of the sucker pipe (4) is connected to a pump barrel (34). A pump (5) is provided inside the pump barrel (34). The upper end of the pump (5) is fixedly connected to the lower end of the sucker rod (6). The upper end of the sucker rod (6) is fixedly connected to the output end of the wellhead motor (3). A one-way valve (7) is provided at the lower end of the pump (5). The lower end of the one-way valve (7) is connected to a screen pipe II (8). The device is characterized by: The lower end of the oil pump cylinder (34) is connected to an outer collection liquid cylinder (10), and the lower end of the outer collection liquid cylinder (10) is connected to a screen tube I (14). An inner swirling working cylinder (11) is coaxially arranged inside the outer collection liquid cylinder (10), and an annular gap (22) is formed between the two. The inner swirling working cylinder (11) is composed of an outlet collector (17) and an inlet swirling device (18) fixed at the upper and lower ends of a central tube (23), and solid chemical agent blocks (12) are stacked sequentially inside the inner swirling working cylinder (11).

2. The bamboo tube spiral progressive chemical anti-wax and anti-scaling device according to claim 1, characterized in that... The central tube (23) is composed of one or more graphene composite steel pipes II (16) connected sequentially from top to bottom by pipe couplings II. The upper end is threaded with an outlet collector (17) and the lower end is threaded with an inlet cyclone separator (18).

3. The bamboo tube spiral progressive chemical anti-wax and anti-scaling device according to claim 1 or 2, characterized in that: A baffle (24) is fixed at the top of the central tube (23), and a one-way piston valve (19) is provided on the baffle (24).

4. The bamboo tube spiral progressive chemical anti-wax and anti-scaling device according to claim 1 or 2, characterized in that... The liquid inlet cyclone (18) is composed of multiple long strip-shaped liquid outlets evenly arranged around the outer wall of a pipe section, and the liquid outlet collector (17) is composed of multiple long strip-shaped liquid inlets evenly arranged around the outer wall of a pipe section.

5. The bamboo tube spiral progressive chemical anti-wax and anti-scaling device according to claim 1, characterized in that... The lower end of the oil extraction pipe (4) is connected to an upper conversion connector. The upper conversion connector is formed by connecting the lower end of a circular pipe I (9) to an integral circular annular plate I (25). The upper end of the circular pipe I (9) is threaded to the lower end of the oil extraction pipe (4). The outer edge of the circular annular plate I (25) is seated at the upper opening of the outer liquid collection cylinder (10) and threaded to it through pipe coupling I. The lower end of the outer liquid collection cylinder (10) is connected to a lower conversion connector. The lower conversion connector is formed by connecting the upper end of a circular pipe II (13) to an integral expanding pipe (26). The upper end of the expanding pipe (26) is fitted onto the lower end of the outer liquid collection cylinder (10) and threaded to it. The lower end of the circular pipe II (13) is threaded to the screen pipe I (14). The upper and lower ends of the inner vortex working cylinder (11) are respectively placed on the shoulders of the circular annular plate I (25) and the expanding pipe (26).

6. The bamboo tube spiral progressive chemical anti-wax and anti-scaling device according to claim 1 or 5, characterized in that... The external collection liquid cylinder (10) is composed of one or more graphene composite steel pipes I (15) connected sequentially from top to bottom by pipe couplings I.

7. The bamboo tube spiral progressive chemical anti-wax and anti-scaling device according to claim 5, characterized in that... The circular tube II (13) is provided with a bearing end plate (21) at the outlet. The bearing end plate (21) is provided with a liquid inlet hole. The bearing end plate (21) is provided with a support mandrel (28) at the upper center. The support mandrel (28) is slightly higher than the liquid inlet cyclone separator (18).

8. The bamboo tube spiral progressive chemical anti-wax and anti-scaling device according to claim 7, characterized in that... A limiting ring (27) is fixed to the inner wall of the lower opening of the outer liquid collection cylinder (10). The horizontal edge of the bearing end plate (21) sits on the shoulder of the expansion pipe (26) and extends vertically upward to be locked on the limiting ring (27) for positioning. The lower opening of the liquid inlet cyclone separator (18) sits on the horizontal edge of the bearing end plate (21) and is tightly fitted with its vertical section.

9. The bamboo tube spiral progressive chemical anti-wax and anti-scaling device according to claim 1, characterized in that... The upper seat of the liquid outlet collector (17) has a stepped clamping end plate (20), and the upper conversion connector clamps the stepped clamping end plate (20) and is firmly connected by the pipe coupling I thread; a sealing ring I (32) is provided below the stepped clamping end plate (20) and between the upper outer wall of the liquid outlet collector (17) and the upper inner wall of the outer liquid collection cylinder (10).

10. The bamboo tube spiral progressive chemical anti-wax and anti-scaling device according to claim 1, characterized in that... The solid chemical reagent block (12) is a circular block with a spiral groove (29) around its circumference and a shaft hole (30) in the center. An extended isolation block (31) integral with the shaft hole (30) is provided at the lower end of the shaft hole (30).

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