A solid anti-wax, anti-scaling and anti-corrosion device for oil well anode layer

Abstract

The present invention provides a solid anti-wax, anti-scale, and anti-corrosion device for oil well anode layering. The device comprises a lower connector, a housing, a pill block, an isolated anode plate, and an upper connector. The housing is connected to the lower connector and the upper connector at both ends. A tubular isolated anode plate is disposed within the housing. The pill block is positioned between the isolated anode plate and the housing. The present invention prevents scale, wax, and corrosion in the wellbore of an oil well.

Description

Technical Field

[0001] The invention relates to the technical field of oil well production, in particular to an anode layer-advanced solid anti-wax, anti-scaling and anti-corrosion device for oil wells. Background Art

[0002] Because formation water in oilfields is generally highly mineralized, the comprehensive water cut of oil wells continues to increase as oilfield development progresses. After reaching the medium-to-high water cut stage, the scale, wax, and corrosion prevention of production tubing becomes increasingly serious, causing significant damage to crude oil production. During crude oil extraction, scale, wax, and corrosion accumulate in the well tubing and downhole equipment, causing accidents such as reduced pipe diameter, blasthole blockage, difficulty setting packers, pump sticking, pump leakage, sucker rod breakage, tubing leakage, and tubing detachment. Scaling, waxing, and corrosion on the tubing not only affect the wellbore's lifting capacity and reduce the service life of the pump and tubing, but also easily cause downhole accidents, shorten pump inspection cycles, and seriously affect the normal production of the well. Currently, there is no solid anti-scaling, anti-wax, and anti-corrosion device suitable for preventing scale, wax, and corrosion in oil wellbores. Summary of the Invention

[0003] The invention provides a solid anti-wax, anti-scaling and anti-corrosion device for an anode layer of an oil well, so as to realize the anti-scaling, anti-wax and anti-corrosion of an oil wellbore.

[0004] The present invention provides a solid anti-wax, anti-scaling and anti-corrosion device for an anode layer of an oil well, comprising:

[0005] lower connector, shell, medicine block, isolated anode plate and upper connector;

[0006] The two ends of the shell are respectively connected to the lower joint and the upper joint;

[0007] A tubular isolated anode plate is provided inside the shell;

[0008] The medicine block is placed between the isolated anode plate and the shell.

[0009] Furthermore, the device further comprises: at least two isolation rings;

[0010] The at least two isolation rings are arranged between the isolation anode plate and the shell, and the at least two isolation rings are distributed in sequence along the axial direction of the shell.

[0011] Furthermore, the device further comprises: a filter, which is arranged between the upper joint and the uppermost isolation ring.

[0012] Furthermore, a spiral guide groove is provided inside the lower joint.

[0013] Furthermore, the exterior of the medicine block is wrapped with a fixed net.

[0014] Furthermore, the isolated anode plate is in the shape of a circular tube.

[0015] Furthermore, the isolated anode plate is made of aluminum-magnesium alloy.

[0016] The present invention is used for an anode layer-advanced solid anti-wax, anti-scale and anti-corrosion device for oil wells. By isolating the anode plate and the anti-scale and anti-wax medicine block, the anti-wax, anti-scale and anti-corrosion of the oil well is achieved, thereby solving the problem in the prior art that there is no solid anti-wax, anti-corrosion device suitable for anti-scale, anti-wax and anti-corrosion of the oil wellbore. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 This is a schematic structural diagram of a first embodiment of the anode layer-advanced solid anti-wax, anti-scaling and anti-corrosion device for oil wells according to the present invention;

[0019] Figure 2 This is a schematic structural diagram of the anode layer-advanced solid anti-wax, anti-scaling and anti-corrosion device for oil wells used at the wellhead of a low-permeability oil well. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] Figure 1 Schematic diagram of the structure of the first embodiment of the anode layer solid anti-wax, anti-scaling and anti-corrosion device for oil wells according to the present invention; Figure 1 As shown, the present invention is used for an anode layer-advanced solid anti-wax, anti-scaling and anti-corrosion device for oil wells, comprising:

[0022] Lower connector 1, housing 4, medicine block 5, isolated anode plate 6 and upper connector 8;

[0023] The two ends of the housing 4 are connected to the lower connector 1 and the upper connector 2 respectively;

[0024] A tubular isolated anode plate 6 is provided inside the housing 4;

[0025] The medicine block 5 is placed between the isolated anode plate 6 and the housing 4 .

[0026] In this embodiment, both the shell and the isolated anode plate can be tubular, such as a round tube, a square tube or a tube with other cross-sectional shapes. Optionally, both the shell and the isolated anode plate can be round tube-shaped.

[0027] In this embodiment, the medicine block 5 is an anti-scaling and anti-wax medicine block, which is composed of a high-efficiency anti-scaling and anti-wax anti-corrosion agent, a framework support agent, a dissolution rate regulator and a small amount of an active agent, and the proportions thereof are determined according to the results of on-site crude oil composition experiments.

[0028] In this embodiment, a slow-release mechanism is adopted to mix a high-efficiency solid anti-scaling, anti-wax and anti-corrosion agent with a slow-dissolving substance such as a dissolution rate regulator, and then solidified and formed through a special process to form a chemical solid anti-scaling, anti-wax and anti-corrosion device, which is lowered into the oil well. Under the immersion and flushing of the well fluid, it slowly dissolves and continuously releases the high-efficiency anti-scaling, anti-wax and anti-corrosion agent, thereby continuously suppressing scaling, waxing and corrosion of the oil well.

[0029] In this embodiment, the isolated anode plate 6 can be made of aluminum-magnesium alloy.

[0030] In this embodiment, the isolated anode plate protects the pump and valve from corrosion. Anode polarization using an active alloy causes the pump and valve to transition from an activated state to a passive state, thereby reducing or preventing corrosion. Specifically, in this application, the isolated anode plate acts as an anode to protect the pump and valve from corrosion. During use, the isolated anode plate gradually corrodes, gradually exposing the anti-scaling and anti-wax drug block between the isolated anode plate and the housing. This allows the isolated anode plate to not only protect the pump and valve from corrosion but also control the release rate of the drug block.

[0031] In this embodiment, a drug storage space is formed between the isolated anode plate and the shell, and a variety of drugs, both solid and liquid, can be added according to different oil well conditions.

[0032] Optionally, the device further comprises: at least two isolation rings;

[0033] The at least two isolation rings are arranged between the isolation anode plate and the shell, and the at least two isolation rings are distributed in sequence along the axial direction of the shell.

[0034] In this embodiment, the number of isolation rings is designed according to actual needs, and the distance between the isolation rings is not fixed. They can be evenly distributed or flexibly designed according to actual needs. In this embodiment, the distance between the isolation rings can be designed according to the downhole corrosion time and the amount of added medicine. The composition of each layer of medicine blocks, different medicines released in each time period, different medicines in different spaces, and different medicines designed according to different oil well conditions can meet the oil well anti-wax, anti-corrosion and anti-scaling needs.

[0035] Optionally, the device further comprises: a filter, wherein the filter is arranged between the upper joint and the uppermost isolation ring.

[0036] In this embodiment, the filter is used to isolate debris and particles.

[0037] Optionally, a spiral guide groove is provided inside the lower joint.

[0038] In this embodiment, a spiral guide groove is provided inside the lower joint so that the liquid entering the guide groove forms a vortex, thereby increasing the flushing and dissolution of the drug.

[0039] Optionally, the medicine block is wrapped with a fixed net on the outside.

[0040] In this embodiment, a fixing net is wrapped around the outside of the medicine block to prevent large pieces of medicine from falling into the tube and blocking the tube opening.

[0041] In this embodiment, a slow-release mechanism is adopted to mix a high-efficiency solid anti-scale, anti-wax and anti-corrosion agent with a slow-dissolving substance such as a dissolution rate regulator, and then solidified and formed through a special process to form a chemical solid anti-scale, anti-wax and anti-corrosion device, which is then lowered into the oil well. Under the immersion and flushing of the well fluid, it slowly dissolves and continuously releases the high-efficiency anti-scale, anti-wax and anti-corrosion agent, thereby continuously suppressing the scaling, waxing and corrosion of the oil well, and the cycle can be more than one year. The isolated anode plate protects the pump and valve from corrosion, and the active alloy is used for anode polarization, so that the pump and valve are converted from an activated state to a passivated state, thereby reducing or preventing corrosion. The present invention is used for the anode layer solid anti-wax, anti-scale and anti-corrosion device for oil wells, which has the advantages of long action period, low cost and long service life, and is an economical, effective and practical anti-scale, anti-wax and anti-corrosion measure.

[0042] Figure 2 This is a schematic diagram of the structure of the solid anti-wax, anti-scaling and anti-corrosion device for oil well anode layer used in low permeability oil well wellhead. Figure 2 As shown, when used on site, shut down the pumping unit, tighten the brake device, close the valves at each position at the wellhead, lift the pipe string, connect the anti-wax, anti-scale and anti-corrosion device 20 to the upper end of the eye tube 21, and connect the upper end of the anti-wax, anti-scale and anti-corrosion device to the pump 22 and the pipe string to complete the installation.

[0043] The anti-wax, anti-scaling and anti-corrosion device of the present invention can be installed in any production area, and is particularly suitable for the wellhead of a low-permeability oil well.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A solid anti-wax, anti-scaling and anti-corrosion device for oil well anode layer, characterized in that: include: lower connector, shell, medicine block, isolated anode plate and upper connector; The two ends of the shell are respectively connected to the lower joint and the upper joint; A tubular isolated anode plate is provided inside the shell; The medicine block is placed between the isolated anode plate and the shell; The device further comprises: at least two isolation rings; The at least two isolation rings are arranged between the isolation anode plate and the shell, and the at least two isolation rings are sequentially distributed along the axial direction of the shell; The medicine block is an anti-scaling and anti-wax medicine block, which is composed of an anti-scaling and anti-wax anti-corrosion agent, a framework support agent, a dissolution rate regulator and a small amount of an active agent; The isolated anode plate acts as an anode to protect the pump valve from corrosion. The isolated anode plate gradually corrodes during use, causing the anti-scaling and anti-wax medicine block between the isolated anode plate and the shell to gradually be exposed. This allows the isolated anode plate to not only protect the pump valve from corrosion, but also control the release speed of the medicine block. The isolated anode plate is made of aluminum-magnesium alloy; The distance between the isolation rings is designed according to the downhole corrosion time and the dosage.

2. The device according to claim 1, characterized in that The device further comprises a filter, which is arranged between the upper joint and the uppermost isolation ring.

3. The device according to any one of claims 1 to 2, characterized in that A spiral guide groove is provided inside the lower joint.

4. The device according to any one of claims 1 to 2, characterized in that The exterior of the medicine block is wrapped with a fixed net.

5. The device according to any one of claims 1 to 2, characterized in that: The isolated anode plate is in the shape of a circular tube.

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