Airtight joint liner for corrosion resistant oil pipe

Abstract

The utility model relates to oil pipe technical field, concretely is a kind of gas seal connection inner lining anticorrosion oil pipe, including oil pipe body, and oil pipe body includes outer steel pipe and inner anticorrosion inner lining layer.The utility model is tightly adhered by outer steel pipe and inner anticorrosion inner lining layer hot-pressing forming, can effectively resist corrosion medium erosion, greatly prolongs oil pipe service life, and male joint outer thread is combined with female joint inner thread, realizes connection, simultaneously, the first and second taper surface sealing platform of male joint is accurately matched with female joint corresponding sealing groove, along with thread screwing, gap is filled by elastic sealing ring in groove extrusion deformation, forms double sealing structure, can effectively prevent gas or liquid leakage, so that oil pipe in the process of conveying corrosive medium, both guarantee sealing performance, and improve corrosion resistance, significantly improve the use safety and reliability of oil pipe, applicable to the complex working condition of high sealing property and anticorrosion requirement, have good industrial application value.

Description

Technical Field

[0001] This utility model relates to an airtight connection with an anti-corrosion lining for oil pipes, belonging to the field of oil pipe technology. Background Technology

[0002] In the field of oil and gas extraction and transportation, pipelines, as key transportation components, need to withstand the erosion of high pressure and highly corrosive media for a long time. As oil and gas resource extraction expands to complex environments such as deep sea and highly acidic gas fields, the working conditions of pipelines are becoming increasingly harsh.

[0003] Most existing ordinary oil pipes are made of a single metal material. When exposed to corrosive media such as hydrogen sulfide and carbon dioxide, they are prone to problems such as thinning of the pipe wall due to corrosion and perforation, leading to media leakage. This not only wastes resources but may also cause safety accidents and environmental pollution. Replacement and maintenance costs are also high. Some oil pipes with anti-corrosion coatings have an unstable bond between the anti-corrosion coating and the pipe body, which is prone to peeling and failure under the scouring of high-pressure fluids. In addition, oil pipe connections usually rely solely on threaded seals, which are not very effective. Under high-pressure environments or corrosive media, gas or liquid leakage is likely to occur at the threaded connections.

[0004] Therefore, it is urgent to improve the gas-tight connection lined with anti-corrosion oil pipe to solve the above-mentioned problems. Utility Model Content

[0005] The purpose of this invention is to provide an airtight, corrosion-resistant oil pipe with an inner lining. The outer steel pipe and the inner corrosion-resistant lining are hot-pressed together for a tight fit, effectively resisting corrosive media and significantly extending the service life of the oil pipe. The male connector's external thread engages with the female connector's internal thread to achieve connection. Simultaneously, the first and second conical sealing surfaces of the male connector precisely match the corresponding sealing grooves of the female connector. As the threads tighten, the elastic sealing rings within the grooves are compressed and deformed to fill the gaps, forming a double-sealing structure. This effectively prevents gas or liquid leakage, ensuring both sealing performance and improved corrosion resistance during the transport of corrosive media. This significantly enhances the safety and reliability of the oil pipe, making it suitable for complex working conditions with high requirements for sealing and corrosion resistance, and possessing significant industrial application value.

[0006] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0007] An airtight connection lined anti-corrosion oil pipe includes an oil pipe body, the oil pipe body including an outer steel pipe and an inner anti-corrosion lining layer, the inner anti-corrosion lining layer being tightly bonded to the inner wall of the outer steel pipe by a hot pressing forming process.

[0008] A male connector is installed at one end of the tubing body. The outer surface of the male connector is provided with a first conical sealing platform and a second conical sealing platform, and the male connector is provided with an external thread.

[0009] The other end of the oil pipe body is equipped with a female connector. The female connector has a first sealing groove and a second sealing groove inside. An elastic sealing ring is embedded in both the first sealing groove and the second sealing groove. The first sealing groove corresponds to the first conical sealing platform, and the second sealing groove corresponds to the second conical sealing platform. The inner sidewall of the female connector is provided with an internal thread, which corresponds to the external thread.

[0010] Preferably, the first conical sealing platform is disposed on the side close to the male connector port, and the inclination angle of the first conical sealing platform is 30°.

[0011] Preferably, the second conical sealing platform is disposed on the side close to the external thread, and the inclination angle of the second conical sealing platform is 15°.

[0012] Preferably, a first nut is installed at the end of the male connector near the oil pipe body.

[0013] Preferably, a second nut is installed at the end of the female connector near the oil pipe body.

[0014] Preferably, the first nut and the second nut are connected by a plurality of evenly distributed double-ended bolts.

[0015] This utility model has at least the following beneficial effects:

[0016] 1. This utility model achieves a tight fit between the outer steel pipe and the inner anti-corrosion lining layer through hot pressing, effectively resisting corrosive media erosion and greatly extending the service life of the oil pipe. Furthermore, the male connector's external thread and the female connector's internal thread engage to achieve connection. Simultaneously, the first and second conical sealing surfaces of the male connector precisely match the corresponding sealing grooves of the female connector. As the threads tighten, the elastic sealing rings within the grooves are compressed and deformed to fill the gaps, forming a double-sealing structure. This effectively prevents gas or liquid leakage, ensuring both sealing performance and improved corrosion resistance during the transport of corrosive media. This significantly enhances the safety and reliability of the oil pipe, making it suitable for complex working conditions with high requirements for sealing and corrosion resistance, and possessing significant industrial application value. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1 A schematic diagram of the overall structure of this utility model;

[0019] Figure 2A cross-sectional view of the overall structure provided for this utility model;

[0020] Figure 3 A cross-sectional view of the connection state of the male and female connectors provided by this utility model;

[0021] Figure 4 A schematic diagram showing the connection status of the male and female connectors provided by this utility model.

[0022] In the diagram, 1. Pipe body; 11. Outer steel pipe; 12. Inner anti-corrosion lining layer; 2. Male connector; 21. First conical sealing surface; 22. Second conical sealing surface; 23. External thread; 3. Female connector; 31. First sealing groove; 32. Second sealing groove; 33. Elastic sealing ring; 34. Internal thread; 4. First nut; 5. Second nut; 6. Double-ended bolt. Detailed Implementation

[0023] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0024] like Figures 1-4 As shown, the gas-tight connection lined anti-corrosion oil pipe provided in this embodiment includes an oil pipe body 1. The oil pipe body 1 includes an outer steel pipe 11 and an inner anti-corrosion liner 12. The inner anti-corrosion liner 12 is tightly attached to the inner wall of the outer steel pipe 11 by a hot pressing forming process.

[0025] One end of the tubing body 1 is equipped with a male connector 2. The outer surface of the male connector 2 is provided with a first conical sealing platform 21 and a second conical sealing platform 22, and the male connector 2 is provided with an external thread 23.

[0026] A female connector 3 is installed at the other end of the tubing body 1. The female connector 3 has a first sealing groove 31 and a second sealing groove 32 inside. An elastic sealing ring 33 is embedded in both the first sealing groove 31 and the second sealing groove 32. The first sealing groove 31 corresponds to the first conical sealing platform 21, and the second sealing groove 32 corresponds to the second conical sealing platform 22. An internal thread 34 is provided on the inner wall of the female connector 3, corresponding to the external thread 23. The tubing body 1 is formed by hot-pressing an outer steel pipe 11 and an inner anti-corrosion lining layer 12 to form a tight bond. The outer steel pipe 11 provides high-strength support, and the inner anti-corrosion lining layer 12 can resist corrosive media erosion, thereby extending the service life of the tubing. During connection, A layer of sealant is applied to the male connector 2 at one end of the tubing body 1. Then, the external thread 23 on the male connector 2 is screwed into the internal thread 34 of the female connector 3 at the other end of the tubing body 1 to achieve connection. At the same time, the first conical sealing plate 21 and the second conical sealing plate 22 on the outer surface of the male connector 2 are aligned with the first sealing groove 31 and the second sealing groove 32 in the female connector 3, respectively. As the threads are tightened, the elastic sealing rings 33 inside the first sealing groove 31 and the second sealing groove 32 are compressed and deformed, filling the sealing gap and forming a double sealing structure. This effectively prevents gas or liquid leakage, thus ensuring that the tubing can not only guarantee the sealing effect to prevent leakage when transporting corrosive media, but also ensure the long-term stable use of the tubing with the anti-corrosion lining layer.

[0027] Furthermore, such as Figures 1-4 As shown, the first conical sealing platform 21 is located on the side near the port of the male connector 2, and the inclination angle of the first conical sealing platform 21 is 30°. When the male and female connectors 3 are screwed together, the first conical sealing platform 21 first contacts and squeezes the elastic sealing ring 33 in the first sealing groove 31 of the female connector 3. The radial component force generated by the 30° inclined surface makes the elastic sealing ring 33 fully deform and fill the gap to form an initial seal. At the same time, it guides the male connector 2 to be accurately aligned, providing precise guidance for the subsequent mating of the second conical sealing platform 22 and thread tightening, thereby enhancing the overall sealing reliability.

[0028] Furthermore, such as Figures 1-4 As shown, the second conical sealing platform 22 is located on the side close to the external thread 23, and the inclination angle of the second conical sealing platform 22 is 15°. When the threads of the male and female connector 3 are tightened to near the final position, the second conical sealing platform 22 and the elastic sealing ring 33 in the second sealing groove 32 on the female connector 3 fit and press against each other. The smaller inclination angle makes the elastic sealing ring 33 more evenly compressed, which can further fill the tiny gaps and form a double seal with the first conical sealing platform 21. Under the axial force of the thread tightening, the sealing effect is enhanced, thereby effectively preventing media leakage.

[0029] Furthermore, such as Figures 1-4As shown, a first nut 4 is installed at the end of the male connector 2 near the oil pipe body 1, and a second nut 5 is installed at the end of the female connector 3 near the oil pipe body 1. The first nut 4 and the second nut 5 are connected by several evenly distributed double-ended bolts 6. Connecting the first nut 4 and the second nut 5 with double-ended bolts 6 can provide an additional uniform and strong axial preload at the oil pipe connection on the basis of the external thread 23 and internal thread 34 thread connection, preventing the male connector 2 and the female connector 3 from loosening due to medium pressure, vibration and other factors, further enhancing the connection stability. Combined with the conical sealing structure, it significantly improves the overall sealing performance and connection reliability of the oil pipe.

[0030] like Figures 1-4 As shown in the figure, the principle of the gas-tight connection with the corrosion-resistant lining oil pipe provided in this embodiment is as follows:

[0031] In use, a layer of sealant is applied to the male connector 2 at one end of the tubing body 1. Then, the external thread 23 on the male connector 2 is screwed into the internal thread 34 of the female connector 3 at the other end of the tubing body 1 to achieve connection. At the same time, the first conical sealing surface 21 and the second conical sealing surface 22 on the outer surface of the male connector 2 are aligned with the first sealing groove 31 and the second sealing groove 32 in the female connector 3, respectively. As the threads are tightened, the elastic sealing rings 33 inside the first sealing groove 31 and the second sealing groove 32 are compressed and deformed, filling the sealing gap and forming a double sealing structure. After completion, the first nut 4 and the second nut 5 are connected by the double-ended bolt 6. On the basis of the threaded connection of the external thread 23 and the internal thread 34, an additional uniform and strong axial preload is provided at the tubing connection to prevent the male connector 2 and the female connector 3 from loosening due to medium pressure, vibration and other factors, further strengthening the connection stability. Combined with the conical sealing structure, the overall sealing performance and connection reliability of the tubing are significantly improved.

[0032] If certain terms are used in the specification and claims to refer to specific components, those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" as used throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0033] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes that element.

[0034] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A gas-tight connection lined anti-corrosion oil pipe, comprising an oil pipe body (1), characterized in that: The oil pipe body (1) includes an outer steel pipe (11) and an inner anti-corrosion lining (12). The inner anti-corrosion lining (12) is tightly attached to the inner wall of the outer steel pipe (11) by hot pressing forming process. One end of the oil pipe body (1) is equipped with a male connector (2), and the outer surface of the male connector (2) is provided with a first conical sealing platform (21) and a second conical sealing platform (22), and the male connector (2) is provided with an external thread (23). The other end of the oil pipe body (1) is equipped with a female connector (3). The female connector (3) has a first sealing groove (31) and a second sealing groove (32) inside. Both the first sealing groove (31) and the second sealing groove (32) are fitted with elastic sealing rings (33). The first sealing groove (31) corresponds to the first conical sealing platform (21), and the second sealing groove (32) corresponds to the second conical sealing platform (22). The inner sidewall of the female connector (3) is provided with an internal thread (34), which corresponds to the external thread (23).

2. The gas-tight connection lined anti-corrosion oil pipe according to claim 1, characterized in that: The first conical sealing platform (21) is located on one side near the port of the male connector (2), and the tilt angle of the first conical sealing platform (21) is 30°.

3. The gas-tight connection lined anti-corrosion oil pipe according to claim 1, characterized in that: The second conical sealing platform (22) is located on the side close to the external thread (23), and the inclination angle of the second conical sealing platform (22) is 15°.

4. The gas-tight connection lined anti-corrosion oil pipe according to claim 1, characterized in that: The male connector (2) is fitted with a first nut (4) at one end near the oil pipe body (1).

5. The gas-tight connection lined anti-corrosion oil pipe according to claim 4, characterized in that: The female connector (3) is fitted with a second nut (5) at one end near the oil pipe body (1).

6. The gas-tight connection lined anti-corrosion oil pipe according to claim 5, characterized in that: The first nut (4) and the second nut (5) are connected by a number of evenly distributed double-headed bolts (6).

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