Underground multi-stage composite anti-scale, anti-wax and anti-corrosion device

Abstract

The utility model discloses an underground multi-stage composite anti-scale, anti-wax and anti-corrosion device, which comprises an upper joint, a lower joint and a lower joint, the upper end of the anti-corrosion outer pipe is screwed with the lower port of the upper joint; the anti-scale alloy core plates are arranged in the anti-corrosion outer pipe and are uniformly arranged along the cross section; the alloy spacer bushes are supported between the outer edges of the adjacent anti-scale alloy core discs; the core shaft penetrates through the center holes of the anti-scale alloy core plates to fix the anti-scale alloy core plates into a whole; the upper end of the vibration outer pipe is connected with the anti-corrosion outer pipe through an upper coupling; a plurality of vibration cores are uniformly arranged along the height direction of the inner cavity of the vibration outer pipe; the core spacer bushes are supported between the outer edges of the adjacent vibration cores; the upper end of the vortex outer pipe is connected with the vibration outer pipe through a lower coupling; the rotational flow inner pipe is positioned in the inner cavity of the vortex outer pipe and is coaxial with the vortex outer pipe; and the rotational flow sheet is positioned in the inner cavity of the rotational flow outer pipe and is wound on the outer wall of the rotational flow inner pipe. The device can simultaneously solve the problems of underground scaling, wax precipitation and corrosion, and has the advantages of environmental protection, high efficiency and low cost.

Description

Technical Field

[0001] This utility model relates to an oilfield downhole anti-scaling device, and more particularly to a downhole multi-stage composite anti-scaling, anti-wax, and anti-corrosion device, belonging to the field of downhole tool technology. Background Technology

[0002] During oilfield development, problems such as downhole scaling, wax deposition, and corrosion severely impact well production efficiency and equipment lifespan. Traditional descaling methods mainly include mechanical and chemical descaling. Mechanical descaling typically involves flushing the pipe wall with water through a small orifice at the tip of the drill pipe, but this method is ineffective for wells with severe scaling and struggles to completely remove the scale layer. Chemical descaling can utilize single or multiple descaling agents depending on the well conditions; however, it requires adding large amounts of descaling agents, wax inhibitors, and other chemicals to the crude oil or injected water. These chemicals not only increase the difficulty of crude oil demulsification and dehydration and wastewater treatment but may also cause secondary pollution to crude oil quality, water quality, the environment, and groundwater. The continuous addition of various chemicals, in turn, increases the difficulty of subsequent crude oil demulsification and dehydration and wastewater treatment, requiring even more and newer chemicals to be added, creating a vicious cycle. Furthermore, chemical descaling requires the continuous addition of new chemicals, leading to increased processing costs and also increasing the labor intensity of workers.

[0003] In recent years, some novel anti-scaling and anti-wax technologies have been gradually applied. For example, special alloy anti-wax devices utilize the micro-battery structure formed on the alloy surface to alter the crystallization morphology of wax in crude oil, preventing wax crystals from accumulating on the pipeline wall, thereby achieving the purpose of anti-wax formation. In addition, some physical methods such as eddy cavitation and acoustic vibration have also been used for anti-scaling and anti-wax formation, inhibiting the formation of scale and wax by altering the flow regime and physical properties of the fluid. However, most of these technologies can only address the anti-scaling or anti-wax problem individually, and their effectiveness in corrosion prevention is limited. Utility Model Content

[0004] Some simplifications or omissions may be made in this section, as well as in the abstract and title of this application, but such simplifications or omissions shall not be used to limit the scope of this utility model.

[0005] The purpose of this invention is to overcome the shortcomings of existing mechanical and chemical descaling methods and provide a multi-stage composite anti-scaling, anti-waxing, and anti-corrosion device for downholes. This device can simultaneously solve the problems of downhole scaling, waxing, and corrosion, and has the advantages of being environmentally friendly, efficient, and low-cost.

[0006] To solve the above technical problems, this utility model provides a multi-stage composite anti-scaling, anti-wax, and anti-corrosion device for downhole drilling, comprising:

[0007] Top connector;

[0008] The upper end of the anti-corrosion outer tube is screwed to the lower end of the upper connector;

[0009] An anti-scaling alloy core disk is disposed inside the anti-corrosion outer tube and is uniformly arranged in multiple rows along the cross-section;

[0010] Alloy spacers are supported between the outer edges of adjacent anti-scaling alloy core discs and are attached to the inner wall of the anti-corrosion outer tube.

[0011] The mandrel passes through the center hole of each anti-scaling alloy core disk and fixes the anti-scaling alloy core disks into a whole.

[0012] The upper end of the vibrating outer tube is connected to the anti-corrosion outer tube via an upper coupling.

[0013] Multiple vibrating cores are evenly arranged along the height direction of the inner cavity of the vibrating outer tube;

[0014] The core spacer is supported between the outer edges of adjacent vibrating cores and fits against the inner wall of the vibrating outer tube;

[0015] The upper end of the eddy current outer tube is connected to the vibrating outer tube via a lower coupling.

[0016] The inner vortex tube is located inside the cavity of the outer vortex tube, and the two are coaxial.

[0017] The vortex vane is located inside the cavity of the outer vortex tube and is wrapped around the outer wall of the inner vortex tube.

[0018] Furthermore, the upper and lower ends of the mandrel are respectively screwed with polished nuts, and the bottom of the polished nuts presses against the center of the end face of the corresponding anti-scalding alloy mandrel.

[0019] Furthermore, the upper and lower ends of the anti-corrosion outer tube are respectively provided with internal thread sections, and each of the two internal thread sections is screwed with a threaded sleeve, and the inner ends of the two threaded sleeves are respectively pressed against the outer edge of the end face of the corresponding anti-scaling alloy core disk.

[0020] Furthermore, hollowed-out parallel rings are screwed into the upper and lower ports of the vibrating outer tube, with the bottom of the upper parallel ring pressing against the top core spacer; and the top of the lower parallel ring abutting against the bottom large end of the bottom vibrating core.

[0021] Furthermore, the vibrating cores are respectively in the shape of a perfect circular cone, narrow at the top and wide at the bottom.

[0022] Furthermore, the lower end of the vortex outer tube is screwed with a lower connector, and the lower part of the lower connector is connected to the screen tube.

[0023] Furthermore, an inner tube core is inserted into the lower port of the inner tube core, and the lower end of the inner tube core is screwed to the center of the orifice plate in the middle section of the lower connector, and the orifice plate is integrated with the lower connector.

[0024] Furthermore, the upper outer wall of the inner tube core is supported on the upper inner wall of the vortex outer tube by three equally spaced support rods.

[0025] Furthermore, the upper part of the upper connector is connected to the bottom of the oil pump.

[0026] Compared with the existing technology, the present invention has achieved the following beneficial effects: 1. It has three functions: alloy anti-scaling device, multi-stage multi-frequency acoustic vibrator, and vortex speed-up device. It does not require the addition of chemicals or heating, and uses physical methods to prevent waxing and scaling, thus avoiding environmental pollution caused by chemical agents.

[0027] 2. It can effectively prevent wax and scale buildup in oil wells, extend the wax removal cycle and pump inspection cycle, and reduce production costs.

[0028] 3. Improve crude oil flowability, reduce crude oil viscosity, and increase oil well production.

[0029] 4. Easy to install, reliable to operate, maintenance-free, and requires no external power. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The drawings are provided for reference and illustration only and are not intended to limit this utility model. Wherein:

[0031] Figure 1 This is a schematic diagram of the structure of the downhole multi-stage composite anti-scaling, anti-wax, and anti-corrosion device of this utility model;

[0032] In the diagram: 1. Upper connector; 2. Corrosion-resistant outer tube; 2a. Screw sleeve; 3. Anti-scaling alloy core disc; 3a. Plain nut; 4. Alloy spacer; 5. Mandrel; 6. Upper coupling; 7. Parallel ring; 8. Vibrating outer tube; 9. Vibrating core; 10. Core spacer; 11. Lower coupling; 12. Vortex outer tube; 13. Swirl vane; 14. Swirl inner tube; 15. Inner tube core; 16. Lower connector. Detailed Implementation

[0033] In the following description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not mean that the device must have a specific orientation.

[0034] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the present utility model will be further described below with reference to specific illustrations. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0036] like Figure 1 As shown, the downhole multi-stage composite anti-scaling, anti-wax, and anti-corrosion device of this utility model includes: upper connector 1, anti-corrosion outer tube 2, anti-scaling alloy core disc 3, alloy spacer 4, mandrel 5, upper coupling 6, parallel ring 7, vibrating outer tube 8, vibrating core 9, core spacer 10, lower coupling 11, vortex outer tube 12, vortex vane 13, vortex inner tube 14, inner tube core 15, and lower connector 16.

[0037] The upper part of the upper connector 1 is connected to the bottom of the oil pump. The external thread at the upper end of the anti-corrosion outer tube 2 is screwed into the internal thread at the lower end of the upper connector 1. The anti-scaling alloy core disk 3 is installed inside the anti-corrosion outer tube 2 and is evenly provided with multiple channels along the cross-section of the anti-corrosion outer tube 2. Adjacent anti-scaling alloy core disks 3 are separated by alloy spacers 4. The alloy spacers 4 are supported between the outer edges of adjacent anti-scaling alloy core disks 3 and are attached to the inner wall of the anti-corrosion outer tube 2. The upper and lower ends of the anti-corrosion outer tube 2 are respectively provided with internal thread sections. A threaded sleeve 2a is screwed into each of the two internal thread sections. The inner ends of the two threaded sleeves 2a are respectively pressed against the outer edge of the end face of the corresponding anti-scaling alloy core disk 3 to achieve the overall axial positioning of the anti-scaling alloy core disk 3.

[0038] The mandrel 5 passes through the center hole of each anti-scaling alloy core disk 3 to fix each anti-scaling alloy core disk 3 into a whole; the upper and lower ends of the mandrel 5 are respectively screwed with polished nuts 3a, and the bottom of the polished nuts 3a presses on the center of the end face of the corresponding anti-scaling alloy core disk 3, so that the anti-scaling alloy core disk 3 and the alloy spacer 4 are tightly connected.

[0039] The upper end of the upper coupling 6 is threaded to the anti-corrosion outer tube 2, and the lower end of the vibrating outer tube 8 is threaded to the upper coupling 6. Multiple vibrating cores 9 are evenly arranged along the height of the inner cavity of the vibrating outer tube 8, and each vibrating core 9 is a perfect conical shape that is narrower at the top and wider at the bottom. The large ends of adjacent vibrating cores 9 are separated by core spacers 10, which are supported between the outer edges of adjacent vibrating cores 9 and fit against the inner wall of the vibrating outer tube 8.

[0040] Hollowed-out parallel rings 7 are screwed into the upper and lower ports of the vibrating outer tube 8, respectively. The bottom of the upper parallel ring 7 presses against the top core spacer 10; the top of the lower parallel ring 7 abuts against the bottom of the large end of the bottom vibrating core 9.

[0041] The lower end of the vibrating outer tube 8 is screwed into the upper port of the lower coupling 11, and the lower end of the lower coupling 11 is screwed into the upper end of the vortex outer tube 12. The inner cavity of the vortex outer tube 12 is provided with a vortex inner tube 14 coaxial with it. The vortex vane 13 is located in the inner cavity of the vortex outer tube 12 and is wound and welded to the outer wall of the vortex inner tube 14, so that the liquid flow rotates.

[0042] The upper outer wall of the inner tube core 15 is supported on the upper inner wall of the vortex outer tube 12 by three equally spaced support rods. The inner tube core 15 is inserted into the lower port of the inner tube core 15, and the lower end of the inner tube core 15 is screwed to the center of the orifice plate in the middle section of the lower connector 16. The orifice plate and the lower connector 16 are integrated.

[0043] The lower end of the eddy current outer tube 12 is screwed with a lower connector 16, and the lower part of the lower connector 16 is connected to the screen tube.

[0044] Working principle or operation process:

[0045] 1. Vortex Acceleration Stage

[0046] Under the suction of the upper oil pump, crude oil enters the lower connector 16 through the screen pipe below the device. It first passes through the vortex booster composed of the vortex outer pipe 12 and the vortex vane 13. The design of the vortex vane 13 generates high-speed swirling and vortex flow in the crude oil, rapidly increasing the flow velocity of the liquid medium. This high-speed swirling flow transforms the liquid from a laminar flow state to a vortex and turbulent flow state, ensuring thorough mixing of oil and water. Scale-forming ions, scale crystals, and paraffin molecules are cut, dispersed, and melted in the product liquid, thereby inhibiting their crystallization and precipitation.

[0047] 2. Multi-stage acoustic vibration stage

[0048] After being accelerated by the vortex, the liquid medium enters upward into the multi-stage acoustic vibration device. The outer vibrating tube 8 and the vibrating core 9 are separated by the core spacer 10, forming a multi-stage vibration system. The liquid generates a large pressure difference through the narrowing design, and the high-speed jet from the nozzle excites the vibration system, causing the medium molecules to vibrate intensely at medium and high frequencies. This vibration has a high frequency, high energy, and short wavelength, accompanied by strong jetting and shearing effects, further dispersing and melting scale-forming substances and preventing their deposition.

[0049] 3. Alloy anti-scaling stage

[0050] The alloy scale inhibitor is made of metals such as copper, zinc, tin, and nickel, and is installed inside the corrosion-resistant outer pipe 2. Because the standard electrode potentials of zinc, tin, and nickel are lower than those of copper, countless tiny electrodes form on the alloy surface, constituting a micro-battery. In the galvanic cell reaction, zinc ions are most easily dissolved, and copper, with its higher potential in the alloy, becomes the cathode. This electrochemical reaction alters the potential of minerals in the fluid, stabilizing the micellar structure of minerals in crude oil and water, preventing wax and water particles from depositing and forming scale, thus ensuring unobstructed crude oil flow and a clean, wax-free, and scale-free pipe wall.

[0051] 4. Overall effect

[0052] This device utilizes the synergistic effects of vortex acceleration, multi-stage acoustic vibration, and alloy anti-scaling to induce a series of changes in the physical properties of crude oil, including flow rate, flow pattern, temperature, pressure, and viscosity. These changes not only effectively prevent wax formation, scaling, and corrosion but also reduce crude oil viscosity, improve its flowability, and increase well production. Furthermore, the device requires no external power, requires no maintenance after a one-time installation, and is suitable for various types of oil wells, including pumping wells, artesian wells, directional wells, and horizontal wells.

[0053] The above description is merely a preferred embodiment of the present utility model, showing and describing the basic principles, main features, and advantages of the present utility model. It is not intended to limit the scope of patent protection of the present utility model. Those skilled in the art should understand that the present utility model is not limited to the above embodiments. In addition to the above embodiments, the present utility model may have other implementations without departing from the spirit and scope of the present utility model. Various changes and improvements to the present utility model are also possible. All technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present utility model. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents. Technical features not described in the present utility model can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A downhole multi-stage composite scale and wax and corrosion prevention device, characterized in that, The utility model relates to a kind of anti-corrosion and anti-fouling oil well pump, including: Upper joint (1); Anti-corrosion outer tube (2), the upper end is screwed with the lower end of the upper joint (1); Anti-fouling alloy core disc (3) is set in the anti-corrosion outer tube (2) and is uniformly provided with multiple along cross section; Alloy spacer (4) is supported between the outer edge of adjacent anti-fouling alloy core disc (3) and is attached to the inner wall of the anti-corrosion outer tube (2); Core shaft (5) is fixed as a whole from the center hole of each anti-fouling alloy core disc (3); Vibration outer tube (8), the upper end is connected with the anti-corrosion outer tube (2) through upper clamp (6); Vibration core (9) is uniformly provided with multiple along the inner cavity height direction of the vibration outer tube (8); Core spacer (10) is supported between the outer edge of adjacent vibration core (9) and is attached to the inner wall of the vibration outer tube (8); Eddy outer tube (12), the upper end is connected with the vibration outer tube (8) through lower clamp (11); Rotational flow inner tube (14) is located in the inner cavity of eddy outer tube (12) and coaxial with it; Rotational flow sheet (13) is located in the inner cavity of the eddy outer tube (12) and is wound on the outer wall of rotational flow inner tube (14).

2. The downhole multi-stage composite scale and wax and corrosion prevention device according to claim 1, characterized in that: The upper and lower ends of the core shaft (5) are respectively screwed with light head nut (3a), and the bottom of the light head nut (3a) is respectively pressed on the end face center of the corresponding anti-fouling alloy core disc (3).

3. The downhole multi-stage composite scale and wax and corrosion prevention device according to claim 1, characterized in that: The upper and lower ends of the anti-corrosion outer tube (2) are respectively provided with internal thread sections, and the inner ends of the two screw sleeves (2a) are respectively pressed on the outer edge of the end face of the corresponding anti-fouling alloy core disc (3).

4. The downhole multi-stage composite scale and wax and corrosion prevention device according to claim 1, characterized in that: The upper and lower ends of the vibration outer tube (8) are respectively screwed with hollow annular rings (7), and the bottom of the upper annular ring (7) is pressed above the core spacer (10) of the top; the top of the lower annular ring (7) is abutted below the large end of the bottom vibration core (9).

5. The downhole multi-stage composite scale and wax and corrosion inhibitor device according to claim 1, characterized in that: The vibration core (9) is respectively a right circular cone with upper narrow and lower wide.

6. The downhole multi-stage composite scale and wax and corrosion inhibitor device of claim 1, wherein: The lower end of the eddy outer tube (12) is screwed with lower joint (16), and the lower part of the lower joint (16) is connected with screen pipe.

7. The downhole multi-stage composite scale and wax and corrosion inhibitor device according to claim 6, characterized in that: The lower end of the rotational flow inner tube (14) is inserted with inner tube core (15), and the lower end of the inner tube core (15) is screwed in the hole plate center of the middle section of the lower joint (16), and the hole plate is integrated with the lower joint (16).

8. The downhole multi-stage composite scale and wax and corrosion inhibitor device according to claim 7, characterized in that: The upper end outer wall of the inner tube core (15) is supported on the upper inner wall of the eddy outer tube (12) by three supporting rods.

9. The downhole multi-stage composite scale, wax and corrosion inhibitor device according to any one of claims 1 to 8, characterized in that: The upper part of the upper joint (1) is connected with the bottom of the oil well pump.

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