Multi-stage petroleum screen pipe

Abstract

The utility model discloses a multi-stage petroleum screen pipe, and relates to the technical field of petroleum exploitation equipment, in particular to a multi-stage petroleum screen pipe which comprises a connecting rod, a bottom cone is installed at the lower end of the connecting rod, a filter shell assembly is connected to the upper portion of the bottom cone in a sleeved mode and comprises an outer shell, outer filter holes are formed in the periphery of the outer shell, and the outer filter holes are communicated with the outer shell. A connecting sleeve is arranged in the upper portion of the outer shell, and a filter element is arranged in the filter shell assembly. Through the arrangement of the bottom cone, the multi-stage petroleum screen pipe has the effects that the lower end is high in strength and not prone to damage, and the multi-stage petroleum screen pipe can be prevented from being blocked by a well wall, through the matched arrangement of the connecting rod and the filter shell assembly, the multi-stage petroleum screen pipe has the effects that the multi-stage petroleum screen pipe can be locally replaced and is convenient to maintain, and through the matched arrangement of the filter shell assembly and the filter element, the multi-stage petroleum screen pipe is convenient to maintain. The multi-stage petroleum screen pipe has the effects that multi-stage filtering can be achieved, and the filtering effect can be changed.

Description

Technical Field

[0001] This utility model relates to the field of oil extraction equipment technology, specifically a multi-stage oil screen pipe. Background Technology

[0002] Oil screens are a key component in the oil extraction process, primarily used for filtering crude oil and formation fluids downhole. Installed between the pump and the oil layer, they allow oil to pass smoothly while preventing solid impurities such as sand and rock fragments from entering the pump and tubing, thus ensuring the normal operation of oil extraction equipment. Existing oil screens are generally single pipes with filter holes around the perimeter, which have several drawbacks. Firstly, the lower end is flat and the wall is thin, making it prone to getting stuck in the well wall during installation, and in severe cases, it can deform and break. Secondly, if only part of the screen is damaged, the entire screen must be scrapped, hindering maintenance. Thirdly, they only provide one layer of filtration, and the filtration effect cannot be changed. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] To address the shortcomings of existing technologies, this utility model provides a multi-stage oil screen pipe, which solves the problems mentioned in the background section.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a multi-stage oil screen pipe, including a connecting rod, a bottom cone installed at the lower end of the connecting rod, a filter housing assembly sleeved on the top of the bottom cone, the filter housing assembly including a housing body, an external filter hole opened around the periphery of the housing body, a connecting sleeve provided inside the top of the housing body, a filter element provided inside the filter housing assembly, a pipe connector sleeved on the top of the filter housing assembly, and locking nuts threadedly connected to both the connecting rod above the pipe connector and above the bottom cone.

[0007] Preferably, the lower end of the bottom cone is a pointed cone, which facilitates insertion into the wellbore. A threaded hole is provided in the middle position above the bottom cone, and the connecting rod is fixedly connected to the bottom cone by the thread. The connection is locked by a lock nut.

[0008] Preferably, the filter housing assemblies are of several types and are connected by connecting sleeves to achieve multi-stage installation. The connecting sleeves are provided with an outer ring and an inner ring. The outer diameter of the outer ring is the same as the inner diameter of the housing, and the inner diameter of the inner ring is slightly larger than the outer diameter of the connecting rod. A through hole for oil flow is provided between the outer ring and the inner ring.

[0009] Preferably, the outer shell and the connecting sleeve can be integrally cast or separately manufactured and then welded together. The outer filter holes are horizontally opened and evenly distributed waist-shaped holes, and the upper and lower layers of outer filter holes are staggered at different angles to ensure the strength of the outer shell.

[0010] Preferably, the connecting rod is a fully threaded rod or a light shaft with threads at both ends. All filter housing assemblies and pipe connectors are connected together by the connecting rod and locked together by the bottom cone and the locking nut to form a multi-stage oil filter pipe.

[0011] Preferably, the filter element includes a filter sleeve, and filter plates are fixedly installed on the upper and lower parts of the filter sleeve by welding. Both the filter sleeve and the filter plates are provided with filter holes with an inner diameter smaller than the width of the outer filter holes. The outer diameter of the filter sleeve is smaller than the inner diameter of the outer shell so that an annular cavity is formed between the two to facilitate the flow of oil.

[0012] This utility model provides a multi-stage oil screen pipe, which has the following beneficial effects:

[0013] 1. This multi-stage oil screen pipe, through the setting of the bottom cone, has the effect of high strength at the lower end, not easy to be damaged, and can avoid being stuck by the well wall. The tip of the bottom cone guides and can avoid being stuck by the well wall when the pipe is lowered. Since the bottom cone is a solid structure with high strength, it is not easy to be damaged even if it hits a rock when lowering the pipe.

[0014] 2. This multi-stage oil screen pipe, through the cooperation of the connecting rod and the filter housing assembly, enables the multi-stage oil screen pipe to be partially replaceable for easy maintenance. Since multiple filter housing assemblies are connected together by the connecting rod, only the damaged filter housing assembly needs to be replaced to restore the system, thus facilitating maintenance.

[0015] 3. This multi-stage oil screen, through the matching arrangement of the filter housing assembly and the filter element, enables the multi-stage oil screen to perform multi-stage filtration and change the filtration effect. The first coarse filtration is completed through the external filter holes of the filter housing assembly, the second filtration is completed through the filter holes of the filter sleeve, and the third filtration is completed through the filter holes of the filter plate. Since the screen is composed of multiple filter housing assemblies, the third filtration occurs multiple times. Since the filter element is an independent and replaceable structure, the effects of the second and third filtrations can be changed. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of the three-dimensional view of this utility model;

[0017] Figure 2 This is a structural schematic diagram of the overall cross-sectional view of this utility model;

[0018] Figure 3This is a structural schematic diagram of the main view of this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of a partial cross-section of the present invention.

[0020] In the diagram: 1. Connecting rod; 2. Bottom cone; 3. Filter housing assembly; 301. Housing; 302. External filter hole; 303. Connecting sleeve; 4. Filter element; 401. Filter sleeve; 402. Filter plate; 403. Filter hole; 5. Pipe connector; 6. Locking 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 of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Please see Figures 1 to 4This utility model provides a technical solution: a multi-stage oil screen pipe, including a connecting rod 1, a bottom cone 2 installed at the lower end of the connecting rod 1, a filter housing assembly 3 sleeved on the top of the bottom cone 2, the filter housing assembly 3 including a housing body 301, an external filter hole 302 opened around the periphery of the housing body 301, a connecting sleeve 303 provided inside the upper part of the housing body 301, and several filter housing assemblies 3 are installed in multiple stages by being sleeved on top and bottom by the connecting sleeves 303, the connecting sleeve 303 is provided with an outer ring and an inner ring, the outer diameter of the outer ring is the same as the inner diameter of the housing body 301, the inner diameter of the inner ring is slightly larger than the outer diameter of the connecting rod 1, a through hole for oil flow is provided between the outer ring and the inner ring, the housing body 301 and the connecting sleeve 303 can be integrally cast. The filter housing can also be manufactured in parts and then welded together. The outer filter holes 302 are horizontally opened and evenly distributed waist-shaped holes. The upper and lower layers of outer filter holes 302 are staggered at different angles to ensure the strength of the outer shell 301. The outer filter holes 302 of the outer shell 301 are relatively large for the first filtration. The filter housing assembly 3 has a filter element 4 inside. The filter element 4 includes a filter sleeve 401. Filter plates 402 are fixedly installed on the upper and lower parts of the filter sleeve 401 by welding. Both the filter sleeve 401 and the filter plate 402 have filter holes 403 with an inner diameter smaller than the width of the outer filter holes 302. The outer diameter of the filter sleeve 401 is smaller than the inner diameter of the outer shell 301, forming an annular cavity between them to facilitate oil flow. Oil enters the pipeline. The oil needs to undergo a second filtration through the filter plate 402 surrounding the filter sleeve 401. For the oil to flow upwards, it also needs a third filtration through the filter holes 403 on the filter plate 402. Since there are more filter elements 4, the oil at the bottom needs to undergo more filtrations to ensure filtration efficiency. Because the filter elements 4 are independently replaceable, the appropriate pore size can be selected based on the impurities in the oil. A pipe connector 5 is fitted onto the top of the filter housing assembly 3. A locking nut 6 is threaded onto both the pipe connector 5 and the bottom cone 2 of the connecting rod 1. The connecting rod 1 is either a fully threaded rod or a threaded shaft at both ends. All the filter housing assemblies 3 and pipe connectors 5 are connected together via the connecting rod 1. A multi-stage oil filter tube is formed by locking the bottom cone 2 with the locking nut 6. The lower end of the bottom cone 2 is a pointed cone, which facilitates insertion into the wellbore. A threaded hole is opened in the middle of the upper part of the bottom cone 2. The connecting rod 1 is fixedly connected to the bottom cone 2 by the thread and locked by the locking nut 6. Since the bottom cone 2 is a solid structure with high strength and is equipped with a pointed cone with a guiding function, the lower end of the filter tube can be prevented from scraping against the well wall during the tube lowering process, thus achieving smooth tube lowering. Even if the bottom cone 2 directly collides with rocks, it will not deform and can also play a role in protecting the filter tube. Since the oil filter tube is composed of a multi-stage connection of the filter housing assembly 3 and the filter element 4 and can be disassembled, if damage occurs, it can be restored by simply disassembling and replacing the new parts, without the entire filter tube being scrapped due to partial damage.

[0023] In use, multiple filter housing assemblies 3 and filter elements 4 are first manufactured in the factory. The filter housing assembly 3 can be cast as a single piece and then machined with external filter holes 302, or only the connecting sleeve 303 can be cast and then connected to the housing 301 by welding. Further, connecting rods 1 of the required length are machined according to requirements. Connecting rods 1 can be fully threaded rods or smooth rods with external threads at both ends. The longer the connecting rod 1, the more filter housing assemblies 3 can be inserted, meaning the longer the connecting rod 1, the longer the assembled oil filter tube and the more filter elements 4. The lower end of the connecting rod 1 is then fixed with a bottom cone 2 via threads and locked with a lock nut 6. Finally, the lock nut 6 is screwed into the upper end of the connecting rod 1 to secure the filter housing. Assembly 3 is pressed tightly against pipe connector 5. Since the filter housing assembly 3 and pipe connector 5 are connected by an internal annular ring, a robust tubular structure is formed after pressing. After assembly, the oil screen pipe is connected to the oil pipeline through pipe connector 5. The connection method of pipe connector 5 depends on the oil pipeline; for example, if the oil pipeline has an external thread, then pipe connector 5 has an internal thread. When the oil screen pipe is inserted into the oil well, the underground oil flows into the screen pipe through the external filter hole 302 under pressure. At this time, solid particles larger than the width of the external filter hole 302 cannot enter to complete the first filtration. Since the external filter hole 302 is an elongated hole, even if fixed particles block part of the hole, oil can still enter. After the oil passes through the external filter hole 302, it enters... Within the cavity between the filter sleeve 401 and the outer casing 301, further oil enters the filter element 4 through the filter hole 403. The filter hole 403 is a round hole with an inner diameter slightly smaller than the width of the outer filter hole 302, which can filter the elongated solid impurities passing through the outer filter hole 302 to complete the secondary filtration. Further oil flows upward and passes through the filter hole 403 of the filter plate 402 to complete the third filtration. At this time, the filtered solid particles are retained in the filter element 4 and repeatedly flushed and rolled, but this does not affect the flow of oil. Moreover, the filter element 4 is a detachable assembly, and it is not necessary to install it in every filter housing assembly 3. The installation time depends on the content of oil impurities. Generally speaking, there are not many fixed particles in underground oil. Absorbing them into the filter element 4 can avoid the need for external filter holes. The internal sealing of the 302 filter tube allows for continuous oil extraction. Furthermore, the filter tube has a multi-stage structure; even if one filter element 4 is blocked, the multi-stage filter housing assembly 3 can still extract oil. Because the filter tube extracts oil from the bottom first, even if filter element 4 is blocked, the blocking proceeds from bottom to top, allowing the filter tube to maintain oil extraction for a long time. Simultaneously, even if filter element 4 is blocked, oil can slowly flow in from the side. Therefore, this filter tube has a longer extraction capacity compared to traditional single-tube filter tubes. During the lowering process, the bottom cone 2 is designed to prevent the filter housing assembly 3 from directly colliding with rocks, thus reducing the risk of damage. Even if damage occurs, repairs only require disassembling the damaged filter housing assembly 3 or filter element 4 and inserting a new one.Compared to traditional filter tubes, which require welding to seal a single hole or must be discarded if damaged, this filter tube is much easier to maintain.

[0024] In summary, this multi-stage oil screen pipe, guided by the pointed tip of the bottom cone 2, avoids being stuck by the well wall during pipe installation. Because the bottom cone 2 is a solid structure with high strength, it is not easily damaged even if it bumps into rocks during installation. The connection between the connecting rod 1 and the filter housing assembly 3 allows for partial replacement, facilitating maintenance. Since multiple filter housing assemblies 3 are connected together by the connecting rod 1, only the damaged filter housing assembly 3 needs to be replaced, thus simplifying maintenance. The first coarse filtration is completed through the external filter hole 302 of the filter housing assembly 3, the second filtration is completed through the filter hole 403 of the filter sleeve 401, and the third filtration is completed through the filter hole 403 of the filter plate 402. Because the screen pipe is composed of multiple filter housing assemblies 3 connected together, the third filtration occurs multiple times. Since the filter element 4 is an independently replaceable structure, the effects of the second and third filtrations can be altered.

[0025] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A multi-stage oil screen pipe, comprising a connecting rod (1), characterized in that: The lower end of the connecting rod (1) is fitted with a bottom cone (2), and a filter housing assembly (3) is sleeved on the top of the bottom cone (2). The filter housing assembly (3) includes a housing body (301), an external filter hole (302) is opened around the periphery of the housing body (301), a connecting sleeve (303) is provided inside the top of the housing body (301), a filter element (4) is provided inside the filter housing assembly (3), a pipe connector (5) is sleeved on the top of the filter housing assembly (3), and a locking nut (6) is threaded on the connecting rod (1) above the pipe connector (5) and above the bottom cone (2).

2. The multi-stage oil screen pipe according to claim 1, characterized in that: The lower end of the bottom cone (2) is a pointed cone, which is convenient for insertion into the well. A threaded hole is provided in the middle position above the bottom cone (2). The connecting rod (1) is fixedly connected to the bottom cone (2) by the thread and is locked by the lock nut (6) when connected.

3. The multi-stage oil screen pipe according to claim 1, characterized in that: The filter housing assembly (3) is of several types and is connected to the upper and lower parts of the connecting sleeve (303) to achieve multi-stage installation. The connecting sleeve (303) is provided with an outer ring and an inner ring. The outer diameter of the outer ring is the same as the inner diameter of the housing (301). The inner diameter of the inner ring is slightly larger than the outer diameter of the connecting rod (1). A through hole for oil flow is provided between the outer ring and the inner ring.

4. The multi-stage oil screen pipe according to claim 1, characterized in that: The outer shell (301) and the connecting sleeve (303) can be integrally cast or separately manufactured and then welded together. The outer filter hole (302) is a horizontally opened and evenly distributed waist-shaped hole. The upper and lower layers of outer filter holes (302) are staggered at different angles to ensure the strength of the outer shell (301).

5. The multi-stage oil screen pipe according to claim 1, characterized in that: The connecting rod (1) is a fully threaded rod or a light shaft with threads at both ends. All the filter housing assemblies (3) and pipe connectors (5) are connected together by the connecting rod (1) and locked together by the bottom cone (2) and the locking nut (6) to form a multi-stage oil filter pipe.

6. The multi-stage oil screen pipe according to claim 1, characterized in that: The filter element (4) includes a filter sleeve (401). Filter plates (402) are fixedly installed on the upper and lower sides of the filter sleeve (401) by welding. Both the filter sleeve (401) and the filter plate (402) are provided with filter holes (403) with an inner diameter smaller than the width of the outer filter hole (302). The outer diameter of the filter sleeve (401) is smaller than the inner diameter of the outer shell (301) so that an annular cavity is formed between the two to facilitate the flow of oil.

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