Underground petroleum filter pipe

Abstract

The utility model relates to the technical field of petroleum filter pipes, and discloses an underground petroleum filter pipe which comprises an outer pipe and an inner pipe, connecting plates are welded to the top and the bottom of the outer pipe, and the top and the bottom of the inner pipe penetrate through the connecting plates welded to the top and the bottom of the outer pipe respectively. The long-strip-shaped filtering through holes in the outer wall of the outer pipe are obliquely formed, accumulation of impurities on the outer wall of the outer pipe is reduced, the blocking risk is reduced, accumulation of impurities on the outer wall of the inner pipe is reduced, and blocking in the filtering net holes of the inner pipe is avoided to a certain degree; according to the filter pipe, the filter effect and the smoothness of petroleum flowing are prevented from being affected by connection dislocation, the two semicircular connecting hoops are formed and can be tightly attached to the outer pipe and the connecting plate, the two semicircular connecting hoops are convenient to assemble and disassemble, the filter pipe is convenient to install, maintain and replace, the construction difficulty and cost are reduced, and the petroleum exploitation efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of oil filter pipe technology, specifically a downhole oil filter pipe. Background Technology

[0002] In oil extraction operations, downhole oil filters play a crucial role. They effectively filter impurities in downhole oil, preventing them from entering subsequent extraction equipment and processes, thus ensuring the smooth progress of oil extraction and the quality of petroleum products. However, existing filter structures may not be optimized enough, resulting in poor filtration effects and an inability to effectively intercept impurities of different particle sizes. Moreover, some particle sizes may clog the filter pores of the oil filter, affecting oil filtration and increasing equipment wear and maintenance costs.

[0003] In practical applications, some oil filter pipes often need to be connected in multiple sections to adapt to downhole environments at different depths. Existing connection methods generally use flanges or other connection methods. However, when using flange connections, the connection positioning is not accurate enough, which is a prominent problem. During the assembly process, it is difficult to achieve precise docking between filter pipes, and misalignment is prone to occur, making the operation more troublesome. To address these issues, we have proposed a downhole oil filter pipe to solve the above problems. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides a downhole oil filter pipe to solve the problems mentioned in the background art.

[0005] This utility model provides the following technical solution: a downhole oil filter pipe, comprising an outer pipe and an inner pipe, wherein connecting plates are welded to the top and bottom of the outer pipe, and the top and bottom of the inner pipe respectively penetrate the connecting plates welded to the top and bottom of the outer pipe, and the top and bottom of the inner pipe are fixedly connected to the top and bottom of the outer pipe at the penetration points, wherein a positioning insertion tube is welded to the top surface of the upper connecting plate at the penetration point of the inner pipe, and the two outer pipes are fixedly connected on their adjacent sides by a connecting hoop, wherein strip-shaped filter through holes are uniformly opened on the outer wall of the outer pipe, and filter mesh holes are uniformly opened on the inner pipe.

[0006] As a preferred embodiment of this utility model, the elongated filter holes on the outer wall of the outer tube are all arranged in an inclined manner.

[0007] As a preferred technical solution of this utility model, the bottom surface of the connecting plate welded to the bottom of the outer tube and located at the bottom penetration of the inner tube is provided with a positioning insertion groove, and the positioning insertion groove matches the positioning insertion tube.

[0008] As a preferred embodiment of this utility model, the connecting hoop is in the shape of two semicircles, and the connecting hoop has a cavity inside that can accommodate two connecting plates stacked together.

[0009] As a preferred technical solution of this utility model, the upper and lower parts of the connecting hoop are provided with through holes that can accommodate the outer ring of the outer tube, and the through holes penetrate and extend into the cavity opened by the connecting hoop.

[0010] As a preferred technical solution of this utility model, multiple mounting holes are provided on both sides of the connecting hoop, and hexagonal bolts and nuts are provided in the mounting holes. The two semi-circular connecting hoops are assembled together by hexagonal bolts and nuts.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. This downhole oil filter pipe provides a channel for oil to enter the filter pipe through strip-shaped filter holes evenly opened on the outer wall of the outer pipe, achieving preliminary filtration, while the filter mesh evenly opened on the inner pipe further refines the oil filtration, effectively intercepting impurities and improving the purity of the oil.

[0013] 2. This downhole oil filter pipe features an inclined design with elongated filter holes on the outer wall of the outer pipe. This design not only increases the filtration area but also provides a guiding effect during oil flow, reducing the accumulation of impurities on the outer wall of the outer pipe, lowering the risk of clogging, and extending the service life of the filter pipe. At the same time, the inclined holes in the outer pipe allow the flowing fluid, such as oil, to impact the outer wall of the inner pipe at an inclined angle, which helps reduce the accumulation of impurities on the outer wall of the inner pipe and, to a certain extent, avoids clogging of the filter mesh in the inner pipe.

[0014] 3. This downhole oil filter pipe, through the cooperative design of positioning insertion pipe and positioning insertion groove, can achieve precise positioning when multiple filter pipes are connected, ensuring that the connection between filter pipes is accurate and avoiding the impact on filtration effect and smooth oil flow due to misalignment.

[0015] 4. This type of downhole oil filter pipe, formed into two semi-circles by connecting clamps, can be tightly fitted to the outer pipe and connecting plate, firmly fixing the two outer pipes together, improving the overall stability and sealing of the filter pipe, preventing oil leakage. Multiple mounting holes on both sides of the connecting clamps, together with hexagonal bolts and nuts, facilitate the assembly and disassembly of the two semi-circular connecting clamps, making it easy to install, maintain and replace the filter pipe, reducing construction difficulty and cost, and improving the efficiency of oil extraction. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a schematic diagram of the orthographic section of the present invention;

[0018] Figure 3 This is a schematic diagram of the connection structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the connecting hoop structure of this utility model.

[0020] In the diagram: 1. Outer tube; 2. Connecting clamp; 3. Positioning insertion tube; 4. Connecting plate; 5. Inner tube; 6. Socket head bolt; 7. Nut. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example 1: Please refer to Figures 1-4 A downhole oil filter pipe comprises an outer pipe 1, an inner pipe 5, a connecting plate 4, a positioning insertion pipe 3, a connecting clamp 2, an internal hex bolt 6, and a nut 7. During manufacturing, the outer pipe 1 and inner pipe 5, made of suitable materials and of appropriate dimensions, are selected. The lengths of the outer pipe 1 and inner pipe 5 are determined according to the actual downhole depth requirements. The connecting plate 4 is welded to the top and bottom of the outer pipe 1, ensuring that the connecting plate 4 is perpendicular to the outer pipe 1 and firmly welded. Next, the top and bottom of the inner pipe 5 are respectively inserted through the connecting plates 4 at the top and bottom of the outer pipe 1, and a fixed connection is made at the insertion points. Welding can be used to ensure the sealing and stability between the inner pipe 5 and the outer pipe 1.

[0023] A positioning insertion tube 3 is welded to the top surface of the connecting plate 4 at the top, where the inner tube 5 passes through. The height and diameter of the positioning insertion tube 3 are designed according to the actual assembly requirements to ensure good positioning. Strip-shaped filter holes are evenly opened on the outer wall of the outer tube 1. These holes are set at an angle, and the angle can be optimized according to the actual filtration effect and fluid flow characteristics. The angled setting helps to reduce the accumulation of impurities on the outer wall of the outer tube 1 and improve filtration efficiency. At the same time, filter mesh holes are evenly opened on the inner tube 5. The size of the filter mesh holes is determined according to the particle size of the impurities to be filtered. The angled holes of the outer tube 1 allow the flowing fluid, such as oil, to impact the outer wall of the inner tube 5 at an angle, which helps to reduce the accumulation of impurities on the outer wall of the inner tube 5 and to a certain extent avoids clogging of the filter mesh holes in the inner tube 5.

[0024] For the connecting plate 4 welded to the bottom of the outer tube 1, a positioning insertion groove is opened on its bottom surface at the bottom penetration of the inner tube 5. The shape and size of the positioning insertion groove match the positioning insertion tube 3 to ensure accurate docking when multiple filter tubes are connected.

[0025] When connecting two filter tubes, bring the two outer tubes 1 close to each other. At this time, insert the positioning insertion tube 3 into the positioning insertion groove on the bottom connecting plate 4 of the other filter tube to achieve initial positioning. Then, put the two semi-circular connecting clamps 2 on the side of the two outer tubes 1 that are close to each other. The connecting clamps 2 have cavities inside that can accommodate two stacked connecting plates 4. At the same time, the upper and lower parts of the connecting clamps 2 have through holes that can accommodate the outer ring of the outer tube 1. The through holes penetrate and extend into the cavity opened in the connecting clamps 2, so that the connecting clamps 2 can fit tightly against the outer tube 1 and the connecting plate 4. Finally, install hexagonal bolts 6 and nuts 7 in the multiple mounting holes opened on both sides of the connecting clamps 2. By tightening the nuts 7, the two semi-circular connecting clamps 2 are assembled together, thereby firmly fixing the two outer tubes 1 together. In order to ensure sealing, a sealing ring can be set inside the connecting clamps 2 to seal the connection between the two assembled oil filter tubes.

[0026] Example 2: Please refer to Figures 1-4 The structure of the downhole oil filter pipe in this embodiment is basically the same as that in Embodiment 1. It also includes an outer pipe 1, an inner pipe 5, a connecting plate 4, a positioning insertion pipe 3, a connecting clamp 2, an internal hex bolt 6, and a nut 7. When making the filter pipe body, the outer pipe 1 and the inner pipe 5 are first subjected to surface treatment, such as sandblasting, to increase their surface roughness and improve the welding quality. After the connecting plate 4 is welded to the top and bottom of the outer pipe 1, the welded parts are ground to remove burrs and welding slag, so that the connection parts are smooth and flat.

[0027] When installing the inner tube 5, a positioning fixture is used to ensure the positional accuracy of the inner tube 5 when it passes through the connecting plate 4, and to avoid displacement. When welding the positioning insertion tube 3, high-precision welding equipment is used to improve the welding quality between the positioning insertion tube 3 and the connecting plate 4, so that it can withstand a certain external force without deformation. The strip-shaped filter through holes on the outer wall of the outer tube 1 are opened using laser cutting technology to ensure the dimensional accuracy and surface quality of the through holes. The angle of the inclined through holes is calculated through simulation to optimize fluid flow and filtration effect.

[0028] When connecting the two filter tubes, first apply a layer of lubricant to the surface of the positioning insertion tube 3 to facilitate insertion into the positioning insertion slot, reduce friction during insertion, and improve assembly efficiency. When installing the connecting clamp 2, apply sealant to the contact surface between the connecting clamp 2 and the outer tube 1 and the connecting plate 4, or add a sealing ring to enhance the sealing of the connection and prevent oil leakage. When tightening the internal hex bolt 6 and nut 7, use a torque wrench and tighten according to the specified torque value to ensure that the connection of the connecting clamp 2 is firm and reliable, while avoiding damage to the connecting clamp 2 or the filter tube due to excessive torque.

[0029] Example 3: Please refer to Figures 1-4 In this embodiment, the downhole oil filter pipe still includes an outer pipe 1, an inner pipe 5, a connecting plate 4, a positioning insertion pipe 3, a connecting clamp 2, an internal hex bolt 6, and a nut 7 in terms of structure. During the manufacturing process, in order to improve the corrosion resistance of the filter pipe, the outer pipe 1 and the inner pipe 5 are made of stainless steel with good corrosion resistance, and the surface is passivated to form a dense oxide film, which further enhances its corrosion resistance. The connecting plate 4 is made of the same material as the outer pipe 1 and is welded to the outer pipe 1 by argon arc welding. Argon arc welding has the advantages of high welding quality and beautiful weld seam, which can effectively ensure the connection strength between the connecting plate 4 and the outer pipe 1.

[0030] After penetrating the connecting plate 4, the inner tube 5 is fixedly connected to the connecting plate 4 by an expansion joint. The expansion joint process can form a tight mechanical connection between the inner tube 5 and the connecting plate 4, improving the reliability and sealing of the connection. The positioning insertion tube 3 is made of high-strength alloy steel to ensure that it will not be damaged during multiple assembly and disassembly processes. After the strip-shaped filter through holes on the outer wall of the outer tube 1 are opened, they are chamfered to remove the sharp corners of the through hole edges, preventing the cutting of impurities during the filtration process and affecting the filtration effect. At the same time, it can also reduce stress concentration at the edge of the through hole and improve the strength of the outer tube 1.

[0031] When connecting multiple filter tubes, align the positioning insertion tube 3 of one filter tube with the positioning insertion slot of the previous filter tube for initial positioning. Next, place the two semi-circular connecting clamps 2 on the sides of the two filter tubes that are close to each other, ensuring the connecting clamps 2 are accurately fitted onto the outer tube 1 and the connecting plate 4. Finally, use an electric wrench to quickly tighten the hex bolts 6 and nuts 7 to complete the filter tube connection. This process significantly improves the assembly efficiency and quality of the filter tubes and reduces errors from manual operation.

[0032] Implementation effect: The strip-shaped filter holes evenly opened on the outer wall of the outer tube 1 provide a channel for oil to enter the filter tube and achieve preliminary filtration, while the filter mesh evenly opened on the inner tube 5 further refines the oil filtration, effectively intercepts impurities, and improves the purity of the oil.

[0033] The elongated filter holes on the outer wall of the outer tube 1 are set at an angle. This design not only increases the filtration area, but also provides a certain guiding effect during the oil flow, reducing the accumulation of impurities on the outer wall of the outer tube 1, reducing the risk of clogging, and extending the service life of the filter tube. At the same time, the angled holes in the outer tube 1 allow the flowing fluid, such as oil, to impact the outer wall of the inner tube 5 at an angle, which helps to reduce the accumulation of impurities on the outer wall of the inner tube 5 and, to a certain extent, avoids clogging of the filter mesh in the inner tube 5.

[0034] The design of the positioning insertion tube 3 and the positioning insertion groove enables precise positioning when multiple filter tubes are connected, ensuring accurate connection between filter tubes and avoiding the impact on filtration effect and smooth oil flow due to misalignment.

[0035] The connecting clamp 2 is in the shape of two semicircles, which can fit tightly on the outer pipe 1 and the connecting plate 4, and firmly fix the two outer pipes 1 together, improving the overall stability and sealing of the filter pipe and preventing oil leakage. The multiple mounting holes on both sides of the connecting clamp 2, together with the internal hex bolts 6 and nuts 7, facilitate the assembly and disassembly of the two semicircular connecting clamps 2, making it easier to install, maintain and replace the filter pipe, reducing construction difficulty and cost, and improving the efficiency of oil extraction.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A downhole oil filter comprising an outer tube (1) and an inner tube (5), characterized in that: The top and bottom of the outer tube (1) are welded with connecting plates (4), the top and bottom of the inner tube (5) respectively penetrate the connecting plates (4) welded on the top and bottom of the outer tube (1), and the top and bottom of the inner tube (5) are fixedly connected with the penetration of the top and bottom of the outer tube (1), the top surface of the connecting plate (4) at the upper portion is welded with a positioning insertion tube (3) at the penetration of the inner tube (5), the two outer tubes (1) are fixedly connected by a connecting hoop (2) on the side close to each other, the outer wall of the outer tube (1) is uniformly provided with strip-shaped filter through holes, and the inner tube (5) is uniformly provided with filter mesh holes.

2. A downhole oil filter screen according to claim 1, characterized in that: The strip-shaped filter through holes provided on the outer wall of the outer tube (1) are all arranged in an inclined manner.

3. A downhole oil filter screen according to claim 1, characterized in that: The bottom surface of the connecting plate (4) welded on the bottom of the outer tube (1) and located at the penetration of the bottom of the inner tube (5) is provided with a positioning insertion groove, and the positioning insertion groove is matched with the positioning insertion tube (3).

4. A downhole oil filter screen according to claim 1, characterized in that: The connecting hoop (2) is in a semicircular shape, and a cavity capable of accommodating two stacked connecting plates (4) is formed in the connecting hoop (2).

5. A downhole oil filter screen according to claim 1, characterized in that: The upper portion and the lower portion of the connecting hoop (2) are both provided with through holes capable of accommodating the outer ring of the outer tube (1), and the through holes penetrate and extend into the cavity of the connecting hoop (2).

6. A downhole oil filter screen according to claim 1, characterized in that: The two sides of the connecting hoop (2) are both provided with a plurality of mounting holes, and the mounting holes are provided with inner hexagonal bolts (6) and nuts (7), and the two semicircular connecting hoops (2) are assembled together by the inner hexagonal bolts (6) and the nuts (7).

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