Pre-scaling device under pump of rod-pumped well and oil pumping string

Abstract

The utility model discloses a pre-scaling device under a rod-pumped well pump and an oil pumping string, which comprise a shell, and a pre-scaling mechanism is arranged in the shell; the pre-scaling mechanism comprises a corrugated plate support, and a corrugated plate is arranged in the corrugated plate support. The device can be arranged on a tubular column and put into a well. According to the utility model, the corrugated plate is used for scaling, and the corrugated plate adopts a corrugated structure, so that the surface area within a limited length can be increased, the flowing liquid can be disturbed, and scaling ions can be quickly separated out easily. The utility model has the advantages of few components, small size and low cost, and is easy to transport and descend into a well. The device is suitable for wells with different well temperatures and different scaling ions, and is high in adaptability and efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas field exploitation, in particular to a pre-scaling device under a pumping well pump and an oil pumping pipe string. Background Art

[0002] During oilfield production, in pumping wells with highly salinized reservoirs, the pressure, temperature, and other environmental conditions change as the well fluid flows from the formation into the wellbore. These changes disrupt the original ionic balance of the formation fluid, causing metal ions such as calcium and magnesium in the well fluid to combine with acid ions, resulting in scaling within the pump barrel. When the scale reaches a certain thickness, it can cause pump sticking or pump leakage. Because the scale layer is dense and strong, it cannot be removed by flushing or pump vibration.

[0003] Current downhole scale prevention methods include adding corrosion and scale inhibitors to casing and installing strong magnetic scale inhibitors below the pump. However, due to the influence of multiple factors, such as the water content of the produced fluid, crude oil viscosity, formation temperature, and agent compatibility, the effectiveness of scale prevention in mines is suboptimal. This results in a failure to effectively extend the production cycle of scale-involved wells and well failures due to scale buildup. Magnetizers are generally made of permanent magnetic materials, and their magnetic field strength gradually weakens over time, leading to a gradual decline in scale prevention effectiveness. The effect of a magnetic field on an antimagnetic aqueous solution is closely related to the magnetic induction intensity of the applied field, exhibiting a multi-extreme relationship. The effectiveness of strong magnetic scale prevention depends not only on the magnetic induction intensity and the number of peaks, but also on the solution concentration, temperature, and ion types present. Therefore, their blind use in production is crucial; water sample analysis and optimal selection are essential. The application of strong magnetic scale inhibitors in mines has also been ineffective, failing to effectively extend the production cycle of scale-involved wells and leading to well failures due to scale buildup.

[0004] Publication No.: CN110127900A discloses a premixed scaling oilfield produced water treatment device and method. Through the organic arrangement of a premixing unit, a flocculation and sedimentation unit, a regulating unit, a filtration unit and a clean water unit, the water quality is effectively modified through five steps of determining a suitable mixing ratio, mixing two incompatible produced waters for pre-scaling, coagulation and sedimentation treatment, adjusting the pH value of the mixed produced water and filtering the produced water.

[0005] This prior art is a surface device that is limited by size and external structure and cannot be designed into a cylindrical structure and cannot be lowered into the well through an oil pipe.

[0006] Announcement No.: CN213360074U discloses a novel pre-scaling device, which guides heated incoming liquid into the pre-scaling cylinder through a liquid inlet pipe, and enters the gaps between multiple parallel and vertically arranged third pre-scaling plates in sequence through the through-holes at the bottom of the first pre-scaling plate at the front, and slowly flows upward in the gaps between the multiple parallel and vertically arranged third pre-scaling plates. During the flow, some scaling ions are rapidly accumulated and precipitated on the scaling coatings of the pre-scaling plates; after the liquid reaches the top, it enters the second group of multiple parallel and vertically arranged third pre-scaling plates again through the through-holes at the top of the second pre-scaling plate and flows downward, and continues to accumulate and precipitate on the scaling coatings of the multiple parallel and vertically arranged third pre-scaling plates. After repeating this process several times, the liquid is discharged through the liquid outlet pipe, thereby effectively ensuring the large-scale precipitation of scaling ions in the liquid.

[0007] This prior art is a surface device that is limited by size and external structure and cannot be designed into a cylindrical structure and cannot be lowered into the well through an oil pipe.

[0008] Publication No. CN219220372U discloses a downhole scale-inducing ion reduction pre-processor. The pre-processor comprises a central tube, an outer tube externally connected to the central tube, and a plurality of inductive scale-inducing plates fixed to the central tube. The plates are hollow hemispherical, evenly covered with small pores. A through-hole is provided in the center of each plate, through which the central tube passes and is fixedly connected. Some scale-inducing ions and impurities in the well fluid are filtered and aggregated on the scale-inducing plates, which are relatively susceptible to scaling, attachment, and deposition. This purifies the fluid entering the pump to a certain extent, reduces the scale-inducing ion content in the fluid, and thus reduces pump failures.

[0009] This prior art can be lowered into the well, but there is a problem that the through hole is blocked by scaling, which affects the flow of liquid and further affects the scaling effect, and it is difficult to maintain after the well is raised.

[0010] In short, the technical solutions of the above-disclosed technologies, the technical problems to be solved and the beneficial effects produced are all different from those of the present utility model. Regarding the more technical features, technical problems to be solved and the beneficial effects of the present utility model, the above-disclosed technical documents do not provide any technical inspiration. Utility Model Content

[0011] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to provide a pre-scaling device and a pumping string under a pumping unit. By designing a special scaling device that is easy to adhere to scale, the scaling ions can be combined as quickly as possible in the device without affecting the rising capacity of the well fluid. The concentration of scaling ions in the well fluid is greatly reduced by pre-scaling, thereby greatly reducing the probability of pump barrel scaling, or greatly extending the time it takes for the pump to be scaled and reversed. Secondly, it solves the problem of the scaling device being limited by the wellbore space; finally, it solves the problem of not affecting the liquid production. Scale is formed in the device, but the scaling will not affect the liquid production. At the same time, the device has the characteristics of long service life and simple and convenient use.

[0012] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0013] On the one hand, the utility model provides a pre-scaling device under a pumping well pump, comprising a shell in which a pre-scaling mechanism is provided; the pre-scaling mechanism comprises a corrugated plate bracket in which a corrugated plate is provided.

[0014] Furthermore, the corrugated plate is made of corrosion-resistant material, the surface of the corrugated plate is rough, and the angle of the corrugations in the corrugated plate is 60°-120°.

[0015] Preferably, the corrugation angle is 95°.

[0016] Furthermore, the corrugated plate support includes an upper corrugated plate support and a lower corrugated plate support, and at least one corrugated plate is provided between the upper corrugated plate support and the lower corrugated plate support.

[0017] Specifically, the upper corrugated plate bracket and the lower corrugated plate bracket have the same structure and are arranged opposite to each other. The upper corrugated plate bracket or the lower corrugated plate bracket is a hollow frame, and a groove or a through hole is provided on the frame body of the hollow frame;

[0018] Specifically, the corrugated plate is connected to the groove of the hollow frame or connected to the through hole of the hollow frame.

[0019] Furthermore, the hollow frame is a cross, and five grooves are provided on the cross, wherein the first groove is opened at the center of the bracket, and the second groove, the third groove, the fourth groove, and the fifth groove are distributed in a circular array with the center of the cross as the center of the circle.

[0020] Furthermore, the groove is rectangular, the first groove located in the center of the five grooves is horizontal, two of the remaining grooves are parallel to the first groove, and the other two are perpendicular to the first groove.

[0021] Furthermore, the shell is tubular, the upper end of the shell is connected to an upper joint, the lower end of the shell is connected to a lower joint, and the corrugated plate is arranged axially along the shell.

[0022] In the first embodiment of the present invention, the lower end of the upper joint is connected to the outer wall of the upper end of the shell through a first internal thread joint, and the upper end of the lower joint is connected to the outer wall of the lower end of the shell through a second internal thread joint;

[0023] Specifically, the inner diameter of the upper joint is smaller than the inner diameter of the shell, forming an upper pressing platform, and the inner diameter of the lower joint is smaller than the inner diameter of the shell, forming a lower seating platform;

[0024] Specifically, the lower corrugated plate support is seated on the lower seat platform, and an adjustment ring is provided between the upper pressing platform and the upper corrugated plate support, and the upper corrugated plate support is limited by the adjustment ring.

[0025] In the second embodiment of the present invention, the lower end of the upper joint is connected to the inner wall of the upper end of the shell through a first external threaded joint, and the upper end of the lower joint is connected to the inner wall of the lower end of the shell through a second external threaded joint. The lower end surface of the upper joint is an upper pressing platform, and the upper end surface of the lower joint is a lower seating platform.

[0026] Specifically, the outer walls of the upper joint and the lower joint are both provided with limiting rings;

[0027] Specifically, the lower corrugated plate support is seated on the lower seat platform, and an adjustment ring is provided between the upper pressing platform and the upper corrugated plate support, and the upper corrugated plate support is limited by the adjustment ring.

[0028] In a second aspect, the present invention provides a pumping tubing string, comprising a pumping pump, a screen pipe, and a pre-scaling pipe string, wherein the upper end of the pre-scaling pipe string is connected to the pumping pump, and the lower end of the pre-scaling pipe string is connected to the screen pipe; the pre-scaling pipe string includes at least one pre-scaling device under the pumping well pump described in the first aspect.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The utility model can be arranged on a pipe string and lowered into a well.

[0031] 2. This utility model uses corrugated plates for scaling. The corrugated plates adopt a corrugated structure, which not only increases the surface area within a limited length, but also creates a disturbance in the flowing liquid, facilitating the rapid precipitation of scaling ions. Five corrugated plates are installed within a limited space. This not only increases the scaling surface area, but also increases the total length of the plates, thereby increasing the total amount of scale attached to the corrugated plates and extending the total scaling time of the device.

[0032] 3. The corrugated plates in this utility model are arranged symmetrically about the central axis. Scale accumulates most rapidly along the central axis. Four additional corrugated plates are arranged circumferentially around the central axis, fully utilizing the rapid scaling near the axis to achieve the fastest and most effective scale removal. The length of the corrugated plates aligns with the axis, minimizing flow resistance to the produced fluid, increasing the energy of the incoming fluid, and facilitating oil well pumping operations.

[0033] 4. The utility model has few parts, small size, low cost, easy transportation and running into the well. It is suitable for wells with different well temperatures and different scaling ions, with strong adaptability and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The utility model is a structural schematic diagram of a pre-scaling device under a pumping well pump.

[0035] Figure 2 The utility model is a structural schematic diagram of an oil pumping string.

[0036] In the figure: 1, upper joint; 2, adjusting ring; 3, upper corrugated plate bracket; 4, corrugated plate; 5, shell; 6, lower corrugated plate bracket; 7, lower joint;

[0037] 101. Oil well pump; 102. A pre-scaling device under an oil well pump; 103. Screen tube; 104. Thread plug. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] Example 1:

[0040] See also Figures 1 to 2 The utility model provides a pre-scaling device under a pumping well pump, comprising a shell 5, in which a pre-scaling mechanism is provided, the pre-scaling mechanism comprising an upper corrugated plate bracket 3, a corrugated plate 4, and a lower corrugated plate bracket 6, at least one of the corrugated plates 4 is provided between the upper corrugated plate bracket 3 and the lower corrugated plate bracket 6, the surface of the corrugated plate 4 is rough, the corrugated plate 4 is made of corrosion-resistant material, the corrugated plate 4 has a large contact area with the well fluid, and the rough surface is conducive to the adhesion of scale, the upper corrugated plate bracket 3 and the lower corrugated plate bracket 6 are used to firmly place the corrugated plate 4 and resist corrosion.

[0041] The shell 5 is tubular, the upper end of the shell 5 is threadedly connected to the upper joint 1, the lower end of the shell 5 is threadedly connected to the lower joint 7, and the corrugated plate 4 is arranged axially along the shell 5.

[0042] In this embodiment, the lower end of the upper joint 1 is connected to the outer wall of the upper end of the shell 5 through a first internal threaded joint, and the upper end of the lower joint 7 is connected to the outer wall of the lower end of the shell 5 through a second internal threaded joint. The inner diameter of the upper joint 1 is smaller than the inner diameter of the shell 5, forming an upper pressure platform, and the inner diameter of the lower joint 7 is smaller than the inner diameter of the shell 5, forming a lower seat.

[0043] The lower corrugated plate support 6 is seated on the lower seat platform, and an adjustment ring 2 is provided between the upper pressing platform and the upper corrugated plate support 3, and the upper corrugated plate support 3 is limited by the adjustment ring 2.

[0044] Among them, the upper corrugated plate bracket 3 and the lower corrugated plate bracket 6 have the same structure and are arranged opposite to each other. The upper corrugated plate bracket 3 or the lower corrugated plate bracket 6 is a hollow frame, and a groove or through hole is provided on the frame body of the hollow frame. The corrugated plate 4 is plug-connected to the groove of the hollow frame or connected to the through hole of the hollow frame by screws. In this embodiment, the groove is used for connection, and the installation efficiency is high.

[0045] Specifically, the hollow frame is made of stainless steel, and the hollow frame is a cross. Five grooves are set on the cross, among which the first groove is opened at the center of the bracket, and the second groove, the third groove, the fourth groove, and the fifth groove are distributed in a circular array with the center of the cross as the center of the circle, so as to make full use of the space inside the shell 5 and place enough corrugated plates 4 to improve the scaling efficiency.

[0046] The assembly method of this embodiment is to connect the lower joint 7 with the shell 5, place the lower corrugated plate bracket 6 into the shell 5, insert the corrugated plate 4 into the groove of the lower corrugated plate bracket 6, insert the groove of the upper corrugated plate bracket 3 into the corrugated plate 4, place the adjustment ring 2 on the upper corrugated plate bracket 3, and connect the upper joint 1 with the shell 5.

[0047] The upper joint 1 of the lower pre-scaling device 102 of the oil well pump is connected to the lower joint of the oil well pump 101, and the lower joint 7 of the lower pre-scaling device 102 of the oil well pump is connected to the screen tube 103, and a wire plug 104 is provided at the bottom of the screen tube 103.

[0048] During use, ions in the well fluid scale on the corrugated plate 4, which reduces the concentration of ions entering the pump and increases the service life of the pump.

[0049] When the pre-scaling effect needs to be enhanced, the lower connector 7 of a pre-scaling device 102 for a well pumping unit is connected to the upper connector 1 of another pre-scaling device 102 for a well pumping unit with the same structure to form multiple pre-scaling devices in series.

[0050] Example 2:

[0051] Based on Example 1, in this embodiment, the lower end of the upper joint 1 is connected to the inner wall of the upper end of the shell 5 through a first external threaded joint, and the upper end of the lower joint 7 is connected to the inner wall of the lower end of the shell 5 through a second external threaded joint. The lower end surface of the upper joint 1 is an upper pressure platform, and the upper end surface of the lower joint 7 is a lower seat platform.

[0052] The outer walls of the upper joint 1 and the lower joint 7 are both provided with limiting rings to prevent excessive screwing in and damaging the threads.

[0053] The lower corrugated plate support 6 is seated on the lower seat platform, and an adjustment ring 2 is provided between the upper pressing platform and the upper corrugated plate support 3, and the upper corrugated plate support 3 is limited by the adjustment ring 2.

[0054] Example 3:

[0055] Based on Example 1, this example provides a specific pre-scaling device under a pumping well pump.

[0056] The outer dimensions of the upper corrugated plate support 3 or the lower corrugated plate support 6 are 2 mm smaller than the inner diameter of the shell, the thickness of the upper corrugated plate support 3 or the lower corrugated plate support 6 is 10 mm, and the distance between the upper corrugated plate support 3 and the lower corrugated plate support 6 is 900 mm.

[0057] The grooves in the upper corrugated plate support 3 or the lower corrugated plate support 6 are rectangular and measure 6mm x 3mm. The first groove in the center of the five grooves is horizontal. Two of the remaining grooves are parallel to the first groove, and the other two are perpendicular to it, forming three horizontal grooves and two vertical grooves. This fully utilizes the space within the shell to accommodate a sufficient number of corrugated plates 4 and improve scaling efficiency.

[0058] The corrugated plate 4 is 2 mm thick and corrugated, with a corrugation angle of 60°-120° and a lateral distance of 12 mm between the crest and the trough. The larger the corrugation angle, the smaller the surface area of the corrugated plate 4, and the liquid easily enters the corrugation angle, thereby increasing the contact rate between the corrugated plate 4 and the ions and reducing the difficulty of maintaining the corrugated plate 4. Conversely, the smaller the corrugation angle, the larger the surface area of the corrugated plate 4, and the liquid easily enters the corrugation angle, thereby decreasing the contact rate between the corrugated plate 4 and the ions and increasing the difficulty of maintaining the corrugated plate 4.

[0059] Preferably, the corrugation angle is 95°, which balances the surface area and ion contact rate while facilitating maintenance operations after extraction.

[0060] The adjustment ring is in the shape of a hollow cylinder with an outer diameter of 78 mm, an inner diameter of 65 mm and a thickness of 10 mm.

[0061] The upper joint 1 and the lower joint 7 are identical in structure and size and can be interchanged. The adjusting ring 2, the upper corrugated plate bracket 3, the corrugated plate 4 and the lower corrugated plate bracket 6 are fixed by tightening the threads of the upper joint 1 and the lower joint 7.

[0062] The external structure and dimensions of this embodiment meet the requirements for running into an oil well and can be smoothly run into a casing with an outer diameter of 139.7 mm and an inner diameter of 121.4 mm.

[0063] After the two-stage pre-scaling device is connected in series, it is connected to the bottom of the oil pump, and its lower connector 7 is connected to the screen pipe and lowered into the oil well. The oil well is equipped with this product due to severe scaling. It has been in normal production for more than a year without any failure.

[0064] Indoor test results show that scaling occurs quickly and in large quantities near the axis. The farther from the axis, the slower the scaling, with virtually no scaling on the pipe wall. This patented design of the corrugated plate 4 offers the advantage of rapid scaling.

[0065] All components not discussed in detail in this application and the connection methods of the components in this application are well-known technologies in the technical field and can be directly applied without further explanation.

[0066] In this utility model, the term "plurality" refers to two or more, unless otherwise specified. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean fixed, removable, or integral; "connected" can mean directly or indirectly through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0067] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0068] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A pre-scaling device for a well pump, comprising a housing, characterized in that: A pre-scaling mechanism is provided in the shell; The pre-scaling mechanism comprises a corrugated plate support, wherein a corrugated plate is arranged in the corrugated plate support, and the surface of the corrugated plate is rough.

2. The pre-scaling device under the pumping well according to claim 1, characterized in that: The corrugated plate is made of corrosion-resistant material, and the corrugation angle of the corrugated plate is 60°-120°.

3. The pre-scaling device under the pumping well according to claim 2, characterized in that: The corrugation angle is 95°.

4. The pre-scaling device under the pumping well according to claim 1, characterized in that: The corrugated plate support includes an upper corrugated plate support and a lower corrugated plate support, and at least one corrugated plate is provided between the upper corrugated plate support and the lower corrugated plate support; The upper corrugated plate bracket and the lower corrugated plate bracket have the same structure and are arranged opposite to each other. The upper corrugated plate bracket or the lower corrugated plate bracket is a hollow frame, and the frame body of the hollow frame is provided with grooves or through holes; The corrugated plate is connected to the groove of the hollow frame or to the through hole of the hollow frame.

5. The pre-scaling device under the pumping well according to claim 4, characterized in that: The hollow frame is a cross, and five grooves are arranged on the cross, wherein the first groove is opened at the center of the bracket, and the second groove, the third groove, the fourth groove and the fifth groove are distributed in a circular array with the center of the cross as the center of the circle.

6. The pre-scaling device under the pumping well according to claim 5, characterized in that: The groove is rectangular, the first groove located in the center of the five grooves is horizontal, two of the remaining grooves are parallel to the first groove, and the other two are perpendicular to the first groove.

7. The pre-scaling device under the pumping well according to claim 4, characterized in that: The shell is tubular, the upper end of the shell is connected to an upper joint, the lower end of the shell is connected to a lower joint, and the corrugated plate is arranged along the axial direction of the shell.

8. The pre-scaling device under the pumping well according to claim 7, characterized in that: The lower end of the upper joint is connected to the outer wall of the upper end of the shell through a first internal thread joint, and the upper end of the lower joint is connected to the outer wall of the lower end of the shell through a second internal thread joint; The inner diameter of the upper joint is smaller than the inner diameter of the shell, forming an upper pressing platform, and the inner diameter of the lower joint is smaller than the inner diameter of the shell, forming a lower seating platform; The lower corrugated plate bracket is seated on the lower seat platform, and an adjustment ring is provided between the upper pressing platform and the upper corrugated plate bracket, and the upper corrugated plate bracket is limited by the adjustment ring.

9. The pre-scaling device under the pumping well according to claim 7, characterized in that: The lower end of the upper joint is connected to the inner wall of the upper end of the shell through a first external threaded joint, and the upper end of the lower joint is connected to the inner wall of the lower end of the shell through a second external threaded joint. The lower end surface of the upper joint is an upper pressing platform, and the upper end surface of the lower joint is a lower seat platform; The outer walls of the upper joint and the lower joint are both provided with limiting rings; The lower corrugated plate bracket is seated on the lower seat platform, and an adjustment ring is provided between the upper pressing platform and the upper corrugated plate bracket, and the upper corrugated plate bracket is limited by the adjustment ring.

10. A pumping string, comprising a pumping pump and a screen tube, characterized in that: It also includes a pre-scaling pipe string, wherein the upper end of the pre-scaling pipe string is connected to the oil well pump, and the lower end of the pre-scaling pipe string is connected to the screen pipe; The pre-scaling pipe string includes at least one pre-scaling device under a pumping well pump according to any one of claims 1 to 9.

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