Oilfield corrosion and impact resistant flange joint and its forming process

Abstract

This invention relates to the field of oilfield flange joint technology, and discloses an oilfield corrosion-resistant and impact-resistant flange joint and its forming process. The joint includes a disc body, and further includes a first connecting mechanism coaxially fixedly installed on the disc surface. The first connecting mechanism includes an upper pipe, the bottom of which has equally angled upward protrusions, and a bent pipe body fixedly connected to the end faces of the upward protrusions and the upper pipe. A tail connecting mechanism is fixedly installed at the tail of the bent pipe body, and the tail connecting mechanism includes a lower pipe, one end of which has equally angled downward protrusions, and the outer wall of the other end of which has a threaded groove. This oilfield corrosion-resistant and impact-resistant flange joint and its forming process result in better impact resistance, and the fastening bolts are less likely to loosen under long-term oil impact and vibration. Furthermore, the external welding surface of the joint adopts a wavy welding structure, thereby improving the strength of the welding position.

Description

Technical Field

[0001] This invention relates to the field of oilfield flange joint technology, specifically to a corrosion-resistant and impact-resistant flange joint for oilfield use and its forming process. Background Technology

[0002] In oil and gas extraction and gathering processes, flange joints, as indispensable connecting components in pipeline systems, are widely used in critical areas such as wellhead equipment, gathering and transportation pipelines, and platform process pipelines. Flange joints perform multiple functions, including connecting pipelines, sealing media, and bearing external loads. However, existing flange joints still have some problems: Flange joints on the market have poor impact resistance. The fastening bolts of the device are prone to loosening under long-term oil impact and vibration. In addition, the welding surface of the device adopts a circular arc through design, and the welding position of the device is not strong.

[0003] To address the aforementioned issues, there is an urgent need for innovative designs based on the existing flange joints. Summary of the Invention

[0004] The purpose of this invention is to provide a corrosion-resistant and impact-resistant flange joint for oil fields and its forming process, so as to solve the following problems of existing flange joints mentioned in the background: the flange joints on the market have poor impact resistance, the fastening bolts of the device are prone to loosening under long-term oil impact and vibration, and the welding surface of the device adopts a circular arc through design, resulting in low welding strength.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a corrosion-resistant and impact-resistant flange joint for oilfield use and its forming process, comprising: The disc body further includes: a first connecting mechanism coaxially fixedly installed on the disc surface; the first connecting mechanism includes an upper connecting pipe, the bottom of which is provided with equally angled upper protrusions, and a bent pipe body is fixedly connected to the end face of the upper protrusions and the upper connecting pipe; a tail connecting mechanism is fixedly installed at the tail of the bent pipe body; the tail connecting mechanism includes a lower connecting pipe, one end of which is provided with equally angled lower protrusions, and a threaded groove is opened on the outer wall of the other end of the lower connecting pipe; the end face of the lower connecting pipe and the lower protrusions are fixedly installed at the lower end of the bent pipe body; an anti-loosening mechanism is fixedly installed on the outside of the disc body flange, the anti-loosening mechanism includes a bottom ring, the bottom of which is fixedly embedded in a countersunk opening opened on the outer wall of the disc body.

[0006] Preferably, a first protrusion is provided at the outer edge of the upper port of the bent pipe body. The first protrusion and the upper protrusion are alternately distributed. The first protrusion is fixedly embedded in the groove on the outer wall of the upper pipe, and the upper protrusion is fixedly embedded on the upper outer wall of the bent pipe body. An upper sealing ring is fixedly installed on the inner wall of the upper pipe near the bent pipe body. The end of the upper sealing ring is provided with an inclined surface, and the inclined end face of the upper sealing ring is coaxially fitted and embedded on one side of the first insertion ring. The other side of the first insertion ring is fixedly installed on the inner wall of the port of the bent pipe body. The upper sealing ring and the first insertion ring cover the connection between the upper end of the bent pipe body and the upper connector end, so that the upper sealing ring and the first insertion ring can form a closed protective structure.

[0007] Preferably, reinforcing convex rings are fixedly provided on the inner walls of the corners on both the upper and lower sides of the bend, and the reinforcing convex rings and the bend are an integral structure. A second insert ring is fixedly installed on the inner wall of the lower port of the bend. A protective coating is sprayed on the outer walls of the bend, the lower connector and the upper connector to prevent corrosion.

[0008] Preferably, the lower protrusion is fixedly embedded in a groove on the outer wall of the bent pipe body. A second protrusion is provided at an equal angle at the outer edge of the end face of the bent pipe body. The second protrusion is fixedly embedded in a groove on the outer wall of the lower pipe end. A threaded groove is provided on the side of the lower pipe away from the bent pipe body. A material strip is fitted and covered on the outer side of the threaded groove. A lower sealing ring is coaxially fixedly installed on the inner wall of the port of the lower pipe. The end of the lower sealing ring away from the lower pipe is fitted and set on the inclined surface of the second insert ring to form a closed protective structure, so that the lower protrusion at the end of the lower pipe can be positioned on the bent pipe body.

[0009] Preferably, a receiving sleeve is coaxially fixedly installed on the side of the disc body away from the upper pipe. A protective ring is coaxially fixedly connected to the outer edge of the receiving sleeve, and a sealing ring is provided on the inner side of the protective ring. The sealing ring is made of rubber material. The two sides of the sealing ring are tightly fitted with the convex ring of the conical sleeve and the outer wall of the receiving sleeve. One side of the conical sleeve is fitted to the inner wall of the receiving sleeve, and the other side of the conical sleeve is coaxially fixedly installed at the port of the oil pipeline, so that the conical sleeve can fit against the receiving sleeve of the disc body.

[0010] Preferably, an oil supply pipe is coaxially fixedly installed on the side of the tapered sleeve away from the receiving sleeve. A bolt is fitted through the flange hole on the oil supply pipe and the disc body, and the nut at the end of the bolt is fitted and embedded on the outer wall of the oil supply pipe. A nut is threadedly connected to the side of the bolt away from the oil supply pipe, and a pressure ring is coaxially fixedly installed on the bottom of the nut. The bottom of the pressure ring has equally distributed toothed grooves, so that the nut can drive the pressure ring to move.

[0011] Preferably, the protruding rod on the bottom surface of the bottom ring is fixedly embedded in the mounting groove on the disc body. The top of the bottom ring has inclined grooves distributed at equal angles, and the cross-section of the inclined grooves is a right-angled triangle structure. Corresponding downward pressure teeth are fitted in the inclined grooves. A bearing ring is coaxially fitted on the top of the bottom ring. The bottom of the bearing ring is fixedly installed with downward pressure teeth distributed at equal angles, so that the downward pressure teeth can be subjected to the pressure of the bottom ring.

[0012] Preferably, the bottom of the bearing ring is fixedly embedded with a base plate that is evenly distributed. A corresponding limiting tooth is provided on the top of each base plate, and the limiting tooth is slidably installed on the top of the bearing ring. A spring piece is fixedly connected between the bottom surface of the limiting tooth and the top surface of the base plate. The top of the limiting tooth is fitted into the inside of the tooth groove, and the spring piece supports the limiting tooth.

[0013] A forming process for a corrosion-resistant and impact-resistant flange joint for oilfield use includes the following steps: S1: The disc body is coaxially connected to the port of the upper pipe via welding equipment. The bent pipe body and the reinforcing convex ring are integrated structures produced by casting equipment. The thickened reinforcing convex ring at the bend of the bent pipe body can improve the structural strength, enabling the bend of the bent pipe body to effectively withstand the impact corrosion of petroleum products. When it is necessary to fix the first connection mechanism and the tail connection mechanism on the bent pipe body, the upper convex head at the end of the upper pipe is inserted into the mounting groove on the outer wall of the bent pipe body. At the same time, the first convex block at the end of the bent pipe body is also inserted into the mounting groove on the outer wall of the upper pipe. Then, the welding operation is performed. Due to the arc surface structure of the upper convex head and the first convex block, the welding area outside the interface of the bent pipe body is expanded, forming a wave-shaped surrounding welding structure. Compared with the traditional circular welding structure, the welding strength is better. The inside of the bent pipe body maintains an arc-shaped contact surface. At this time, the upper sealing ring will be embedded in the end of the first insert ring. The upper sealing ring and the first insert ring are used to protect the arc-shaped contact surface inside the bent pipe body, thereby reducing the degree of corrosion of the contact surface of the bent pipe body by the petroleum flowing inside the device. S2: The lower protrusion on the lower connector is embedded in the groove on the lower outer wall of the bent pipe body, and the second protrusion at the lower end of the bent pipe body is embedded in the groove on the outer wall of the lower connector. Then, the lower connector and the lower end of the bent pipe body are fixedly connected by welding. According to the connection method at the upper end of the bent pipe body, the lower end interface of the bent pipe body also achieves large-area welding, which improves the structural strength. At the same time, the lower sealing ring is embedded in the second insert ring. The lower sealing ring and the second insert ring together protect the interior of the lower end interface of the bent pipe body. When the threaded groove on the lower connector is connected to the external pipeline thread, the plastic material tape 903 will improve the sealing and fastening effect. S3: After the upper and lower ends of the bend are welded, anti-corrosion coating is sprayed onto the bend, upper pipe and lower pipe using a spraying device to form a protective coating. The tapered sleeve of the oil pipe is inserted into the receiving sleeve on the disc. The tapered sleeve presses the sealing ring tightly onto the receiving sleeve. The protective ring at the edge of the end face of the receiving sleeve can protect the sealing ring. S4: The bottom ring is inserted into the disc body. The bottom pressure teeth of the bearing ring are fitted into the inclined groove at the top of the bottom ring. The oil pipe and the disc body are connected by bolts and nuts. When the nut is rotated to tighten, the pressure ring at the bottom of the nut will rotate synchronously. Since the pressure ring has a limiting tooth embedded in the groove to form a one-way limiting structure, when the nut and pressure ring are rotated to the position, the spring will keep the limiting tooth in place. If the nut is loosened due to vibration or other impacts, the pressure ring will drive the bearing ring and the lower pressure teeth to move synchronously through the limiting teeth. At this time, the lower pressure teeth will generate axial anti-loosening pressure in the inclined groove.

[0014] Compared with the prior art, the beneficial effects of the present invention are: the corrosion-resistant and impact-resistant flange joint for oil fields and its forming process result in better impact resistance of the device, and the fastening bolts of the device are less likely to loosen under long-term oil impact and vibration. Furthermore, the external welding surface of the device adopts a wavy welding structure, thereby improving the strength of the welding position. The specific details are as follows: 1. A protruding rod on the bottom surface of the bottom ring is fixedly embedded in the mounting groove on the disc body. The top of the bottom ring has equidistantly distributed inclined grooves with a right-angled triangular cross-section. Corresponding downward pressure teeth are fitted inside the inclined grooves. A bearing ring is coaxially fitted to the top of the bottom ring. Equidistantly distributed downward pressure teeth are fixedly installed at the bottom of the bearing ring. A base plate with equidistantly distributed bottom plates is fixedly embedded at the bottom of the bearing ring. Corresponding limiting teeth are set directly above the bottom plate. The limiting teeth are slidably installed on the top of the bearing ring. A spring is fixedly connected between the bottom surface of the limiting teeth and the top of the base plate. The top of the limiting teeth is fitted inside the tooth groove. If the nut becomes loose, the pressure ring at the bottom of the nut will move synchronously. The pressure ring will drive the limiting teeth and the bearing ring to move synchronously. The downward pressure teeth at the bottom of the bearing ring will be subjected to the pressure of the bottom ring, thereby preventing loosening. 2. A first protrusion is provided at the outer edge of the upper port of the bent pipe body. The first protrusion and the upper protrusion are distributed alternately. The first protrusion is fixedly embedded in the groove of the outer wall of the upper pipe, and the upper protrusion is fixedly embedded on the upper outer wall of the bent pipe body. An upper sealing ring is fixedly installed on the inner wall of the upper pipe near the bent pipe body. The end of the upper sealing ring is provided with an inclined surface. The inclined end face of the upper sealing ring is coaxially fitted and embedded in one side of the first insertion ring. The other side of the first insertion ring is fixedly installed on the inner wall of the port of the bent pipe body. The upper sealing ring and the first insertion ring cover the connection between the upper end of the bent pipe body and the upper connector end. The arc surface of the first protrusion and the upper protrusion improves the overall welding surface of the bent pipe body, thereby increasing the structural strength of the weld. The upper sealing ring and the first insertion ring can protect the interior. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall external structure of the present invention; Figure 2 This is a schematic diagram of the installation structure of the bent pipe body of the present invention; Figure 3 This is a schematic diagram of the threaded groove mounting structure of the present invention; Figure 4 This is a schematic diagram of the lower sealing ring installation structure of the present invention; Figure 5 This is a schematic diagram of the exploded structure of the lower pipe connection of the present invention; Figure 6 This is a schematic diagram of the pipe installation structure of the present invention; Figure 7 This is a schematic diagram of the upper sealing ring installation structure of the present invention; Figure 8 This is a schematic diagram of the mounting structure of the receiving sleeve of the present invention; Figure 9 This is a schematic diagram of the sealing ring installation structure of the present invention; Figure 10 This is a schematic diagram of the bottom ring mounting structure of the present invention; Figure 11 This is a schematic diagram of the mounting structure of the bearing ring of the present invention.

[0016] In the diagram: 1. Disc body; 2. First connecting mechanism; 201. Upper pipe; 202. Upper protrusion; 203. Upper sealing ring; 3. Bent pipe body; 4. First protrusion; 5. First insert ring; 6. Reinforcing protrusion; 7. Second insert ring; 8. Second protrusion; 9. Tail connecting mechanism; 901. Lower pipe; 902. Threaded groove; 903. Material strip; 904. Lower protrusion; 905. Lower sealing ring; 10. Protective coating; 11. Receiving sleeve; 12. Protective ring; 13. Sealing ring; 14. Conical sleeve; 15. Oil delivery pipe; 16. Bolt; 17. Nut; 18. Pressure ring; 19. Tooth groove; 20. Anti-loosening mechanism; 2001. Bottom ring; 2002. Inclined groove; 2003. Lower pressure teeth; 2004. Bearing ring; 2005. Spring; 2006. Base plate; 2007. Restricting teeth. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-11This invention provides a technical solution: a corrosion-resistant and impact-resistant flange joint for oil fields and its forming process, comprising: The disc body 1 further includes: a first connecting mechanism 2 coaxially fixedly installed on the disc surface of the disc body 1, the first connecting mechanism 2 including an upper pipe 201, the bottom of the upper pipe 201 is provided with an upper protrusion 202 distributed at equal angles, and a bent pipe body 3 is fixedly connected to the end face of the upper protrusion 202 and the upper pipe 201, and a tail connecting mechanism 9 is fixedly installed at the tail of the bent pipe body 3, the tail connecting mechanism 9 including a lower pipe 901, one end of the lower pipe 901 is provided with a lower protrusion 904 distributed at equal angles, and a threaded groove 902 is opened on the outer wall of the other end of the lower pipe 901, the end face of the lower pipe 901 and the lower protrusion 904 are fixedly installed at the lower end of the bent pipe body 3, and an anti-loosening mechanism 20 is fixedly installed on the outside of the flange of the disc body 1, the anti-loosening mechanism 20 including a bottom ring 2001, the bottom of the bottom ring 2001 being fixedly embedded in a countersunk opening opened on the outer wall of the disc body 1.

[0019] A first protrusion 4 is provided at the outer edge of the upper port of the bent pipe body 3. The first protrusion 4 and the upper protrusion 202 are alternately distributed. The first protrusion 4 is fixedly embedded in the groove on the outer wall of the upper connecting pipe 201, and the upper protrusion 202 is fixedly embedded on the upper outer wall of the bent pipe body 3. An upper sealing ring 203 is fixedly installed on the inner wall of the upper connecting pipe 201 near the bent pipe body 3. The end of the upper sealing ring 203 is provided with an inclined surface, and the inclined end face of the upper sealing ring 203 is coaxially fitted and embedded in one side of the first insert ring 5. The other side of the first insert ring 5 is fixedly installed on the inner wall of the port of the bent pipe body 3. The upper sealing ring 203 and the first insert ring 5 cover the connection between the upper end of the bent pipe body 3 and the end of the upper connector 201, thereby increasing the welding area between the upper connecting pipe 201 and the upper end of the bent pipe body 3. The lower protrusion 904 is fixedly embedded in the groove on the outer wall of the bent pipe body 3. An equal angle is provided at the outer edge of the end face of the bent pipe body 3. The second protrusion 8 is fixedly embedded in the groove on the outer wall of the end of the lower pipe 901. The lower pipe 901 has a threaded groove 902 on the side away from the bent pipe body 3. The outer side of the threaded groove 902 is covered with a material strip 903. A lower sealing ring 905 is coaxially fixedly installed on the inner wall of the port of the lower pipe 901. The end of the lower sealing ring 905 away from the lower pipe 901 is attached to the inclined surface of the second insert ring 7 to form a closed protective structure, which increases the welding area of ​​the lower pipe 901 and the lower end of the bent pipe body 3. A reinforcing protrusion 6 is fixedly installed on the inner wall of the corner on both sides of the bent pipe body 3. The reinforcing protrusion 6 and the bent pipe body 3 are an integrated structure. A second insert ring 7 is fixedly installed on the inner wall of the lower port of the bent pipe body 3. A protective coating 10 is sprayed on the outer wall of the bent pipe body 3, the lower pipe 901 and the upper pipe 301 to form an anti-corrosion structure.

[0020] An oil supply pipe 15 is coaxially fixedly installed on the side of the tapered sleeve 14 away from the receiving sleeve 11. A bolt 16 is fitted through the flange hole on the oil supply pipe 15 and the disc body 1, and the nut at the end of the bolt 16 is fitted into the outer wall of the oil supply pipe 15. A nut 17 is threadedly connected to the side of the bolt 16 away from the oil supply pipe 15, and a pressure ring 18 is coaxially fixedly installed at the bottom of the nut 17. The bottom of the pressure ring 18 has equally angled toothed grooves 19. The tapered sleeve 14 can fit into the inclined surface of the receiving sleeve 11. The two disc bodies 1 are far from the upper pipe. A receiving sleeve 11 is coaxially fixedly installed on one side of 201. A protective ring 12 is coaxially fixedly connected to the outer edge of the receiving sleeve 11, and a sealing ring 13 is provided on the inner side of the protective ring 12. The sealing ring 13 is made of rubber material. The two sides of the sealing ring 13 are tightly fitted with the convex ring of the cone sleeve 14 and the outer wall of the receiving sleeve 11. One side of the cone sleeve 14 is fitted to the inner wall of the receiving sleeve 11, and the other side of the cone sleeve 14 is coaxially fixedly installed at the port of the oil pipe 15, so that the cone sleeve 14 can apply pressure to the sealing ring 13.

[0021] The bottom of the bearing ring 2004 is fixedly embedded with a base plate 2006 distributed at equal angles. A corresponding limiting tooth 2007 is provided directly above each base plate 2006, and the limiting tooth 2007 is slidably installed on the top of the bearing ring 2004. A spring piece 2005 is fixedly connected between the bottom surface of the limiting tooth 2007 and the top of the base plate 2006. The top end of the limiting tooth 2007 is fitted into the inside of the tooth groove 19, so that the limiting tooth 2007 at the top of the spring piece 2005 can be positioned in the tooth groove 19 at the bottom of the pressure ring 18. The bottom of the bottom ring 2001... The protruding rods on the surface are fixedly embedded in the mounting grooves on the disc body 1. The bottom ring 2001 has equidistantly distributed inclined grooves 2002 at its top, and the cross section of the inclined grooves 2002 is a right-angled triangle structure. Corresponding downward pressure teeth 2003 are fitted inside the inclined grooves 2002. A bearing ring 2004 is coaxially fitted at the top of the bottom ring 2001. The bottom of the bearing ring 2004 is fixedly installed with equidistantly distributed downward pressure teeth 2003, so that the limiting teeth 2007 can drive the downward pressure teeth 2003 to move through the bearing ring 2004.

[0022] A forming process for a corrosion-resistant and impact-resistant flange joint for oilfield use includes the following steps: S1: The disc body 1 is coaxially connected to the port of the upper pipe 201 via welding equipment. The bent pipe body 3 and the reinforcing convex ring 6 are an integrated structure produced by casting equipment. The thickened reinforcing convex ring 6 at the bend of the bent pipe body 3 can improve the structural strength, enabling the bend of the bent pipe body 3 to effectively withstand the impact corrosion of petroleum products. When it is necessary to fix the first connecting mechanism 2 and the tail connecting mechanism 9 to the bent pipe body 3, the upper convex head 202 at the end of the upper pipe 201 is inserted into the mounting groove on the outer wall of the bent pipe body 3, and at the same time, the first protrusion 4 at the end of the bent pipe body 3 is also inserted into the upper pipe. Welding is then performed in the mounting groove on the outer wall of 201. Due to the arc structure of the upper protrusion 202 and the first protrusion 4, the welding area outside the interface of the bent pipe body 3 is expanded, forming a wave-shaped surrounding welding structure. Compared with the traditional circular welding structure, the welding strength is better. The inside of the bent pipe body 3 maintains an arc-shaped contact surface. At this time, the upper sealing ring 203 will be fitted into the end of the first insert ring 5. The upper sealing ring 203 and the first insert ring 5 are used to protect the arc-shaped contact surface inside the bent pipe body 3, thereby reducing the degree of corrosion of the contact surface of the bent pipe body 3 by the oil flowing inside the device. S2: The lower protrusion 904 on the lower connector 901 is embedded in the groove on the lower outer wall of the bent pipe body 3, and the second protrusion 8 at the lower end of the bent pipe body 3 is embedded in the groove on the outer wall of the lower connector 901. Then, the lower connector 901 and the lower end of the bent pipe body 3 are fixedly connected by welding. According to the connection method of the upper end of the bent pipe body 3, the lower end interface of the bent pipe body 3 is also welded on a large area, which improves the structural strength. At the same time, the lower sealing ring 905 is embedded in the second insert ring 7. The lower sealing ring 905 and the second insert ring 7 together protect the interior of the lower end interface of the bent pipe body 3. When the threaded groove 902 on the lower connector 901 is connected to the external pipeline thread, the plastic material strip 903 will improve the sealing and fastening effect. S3: After the upper and lower ends of the bent pipe body 3 are welded, anti-corrosion coating is sprayed onto the bent pipe body 3, the upper pipe 201 and the lower pipe 901 through the spraying equipment to form a protective coating 10. The receiving sleeve 11 on the disc body 1 is fitted with a tapered sleeve 14 of the oil supply pipe 15. The tapered sleeve 14 presses the sealing ring 13 tightly onto the receiving sleeve 11. The protective ring 12 at the edge of the end face of the receiving sleeve 11 can protect the sealing ring 13. S4: The bottom ring 2001 is inserted into the disc body 1. The bottom pressure teeth 2003 of the bearing ring 2004 are fitted into the inclined groove 2002 at the top of the bottom ring 2001. The oil pipe 15 and the disc body 1 are connected by bolts 16 and nuts 17. When the nut 17 is rotated and tightened, the pressure ring 18 at the bottom of the nut 17 will rotate synchronously. Since the tooth groove 19 of the pressure ring 18 is embedded with a limiting tooth 2007 that forms a one-way limiting structure, when the nut 17 and the pressure ring 18 are rotated into place, the spring piece 2005 will keep the limiting tooth 2007 in place. If the nut 17 is loosened due to vibration or other impacts, the pressure ring 18 will drive the bearing ring 2004 and the lower pressure teeth 2003 to move synchronously through the limiting tooth 2007. At this time, the lower pressure teeth 2003 will generate axial anti-loosening pressure in the inclined groove 2002.

[0023] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A corrosion-resistant and impact-resistant flange joint for oilfield use, comprising: The disc body (1) is characterized in that it further includes: a first connecting mechanism (2) is coaxially fixedly installed on the disc surface of the disc body (1), the first connecting mechanism (2) includes an upper tube (201), the bottom of the upper tube (201) is provided with upper protrusions (202) distributed at equal angles, and a bent tube body (3) is fixedly connected to the end face of the upper protrusions (202) and the upper tube (201), and a tail connecting mechanism (9) is fixedly installed at the tail of the bent tube body (3), the tail connecting mechanism (9) includes a lower tube (901), and so on. One end of the lower connector (901) is provided with a downward protrusion (904) distributed at equal angles, and the outer wall of the other end of the lower connector (901) is provided with a threaded groove (902). The end face of the lower connector (901) and the downward protrusion (904) are fixedly installed at the lower end of the bent pipe body (3). An anti-loosening mechanism (20) is fixedly installed on the outer side of the flange of the disc body (1). The anti-loosening mechanism (20) includes a bottom ring (2001). The bottom of the bottom ring (2001) is fixedly embedded in the countersunk opening on the outer wall of the disc body (1).

2. The corrosion-resistant and impact-resistant flange joint for oilfield use according to claim 1, characterized in that: A first protrusion (4) is provided at the outer edge of the upper port of the bent pipe body (3). The first protrusion (4) and the upper protrusion (202) are alternately distributed. The first protrusion (4) is fixedly embedded in the groove of the outer wall of the upper pipe (201). The upper protrusion (202) is fixedly embedded on the upper outer wall of the bent pipe body (3). An upper sealing ring (203) is fixedly installed on the inner wall of the upper pipe (201) near the bent pipe body (3). The end of the upper sealing ring (203) is provided with an inclined surface. The inclined end face of the upper sealing ring (203) is coaxially fitted and embedded on one side of the first insertion ring (5). The other side of the first insertion ring (5) is fixedly installed on the inner wall of the port of the bent pipe body (3). The upper sealing ring (203) and the first insertion ring (5) cover the connection between the upper end of the bent pipe body (3) and the end of the upper connector (201).

3. The corrosion-resistant and impact-resistant flange joint for oilfield use according to claim 2, characterized in that: A reinforcing convex ring (6) is fixedly installed on the inner wall of the corner on both sides of the bent pipe body (3), and the reinforcing convex ring (6) and the bent pipe body (3) are an integrated structure. A second insert ring (7) is fixedly installed on the inner wall of the lower port of the bent pipe body (3). A protective coating (10) is sprayed on the outer wall of the bent pipe body (3), the lower pipe (901) and the upper pipe (301).

4. The corrosion-resistant and impact-resistant flange joint for oilfield use according to claim 1, characterized in that: The lower protrusion (904) is fixedly embedded in the groove on the outer wall of the bent pipe body (3). The outer edge of the end face of the bent pipe body (3) is provided with a second protrusion (8) distributed at equal angles. The second protrusion (8) is fixedly embedded in the groove on the outer wall of the end of the lower pipe (901). The side of the lower pipe (901) away from the bent pipe body (3) is provided with a threaded groove (902). The outer side of the threaded groove (902) is covered with a material strip (903). A lower sealing ring (905) is coaxially fixedly installed on the inner wall of the port of the lower pipe (901). The end of the lower sealing ring (905) away from the lower pipe (901) is attached to the inclined surface of the second insert ring (7) to form a closed protective structure.

5. The corrosion-resistant and impact-resistant flange joint for oilfield use according to claim 1, characterized in that: A receiving sleeve (11) is coaxially fixedly installed on the side of the disc body (1) away from the upper pipe (201). A protective ring (12) is coaxially fixedly connected to the outer edge of the receiving sleeve (11), and a sealing ring (13) is provided on the inner side of the protective ring (12). The sealing ring (13) is made of rubber material. The two sides of the sealing ring (13) are tightly fitted with the convex ring of the cone sleeve (14) and the outer wall of the receiving sleeve (11). One side of the cone sleeve (14) is fitted on the inner wall of the receiving sleeve (11), and the other side of the cone sleeve (14) is coaxially fixedly installed at the port of the oil pipeline (15).

6. The corrosion-resistant and impact-resistant flange joint for oilfield use according to claim 5, characterized in that: An oil pipe (15) is coaxially fixedly installed on the side of the tapered sleeve (14) away from the receiving sleeve (11). A bolt (16) is fitted through the flange hole on the oil pipe (15) and the disc body (1). The nut at the end of the bolt (16) is fitted and embedded on the outer wall of the oil pipe (15). A nut (17) is threadedly connected to the side of the bolt (16) away from the oil pipe (15). A pressure ring (18) is coaxially fixedly installed at the bottom of the nut (17). The bottom of the pressure ring (18) is provided with toothed grooves (19) distributed at equal angles.

7. The corrosion-resistant and impact-resistant flange joint for oilfield use according to claim 1, characterized in that: The protruding rod on the bottom surface of the bottom ring (2001) is fixedly embedded in the mounting groove on the disc body (1). The bottom ring (2001) has an inclined groove (2002) with equal angle distribution on the top, and the cross section of the inclined groove (2002) is a right triangle structure. The inclined groove (2002) is fitted with a corresponding downward pressure tooth (2003). The top of the bottom ring (2001) is coaxially fitted with a bearing ring (2004), and the bottom of the bearing ring (2004) is fixedly installed with an inclined pressure tooth (2003) with equal angle distribution.

8. The corrosion-resistant and impact-resistant flange joint for oilfield use according to claim 7, characterized in that: The bottom of the bearing ring (2004) is fixedly embedded with a base plate (2006) distributed at equal angles. A corresponding limiting tooth (2007) is provided on the top of each base plate (2006), and the limiting tooth (2007) is slidably installed on the top of the bearing ring (2004). A spring piece (2005) is fixedly connected between the bottom surface of the limiting tooth (2007) and the top surface of the base plate (2006). The top of the limiting tooth (2007) is fitted and embedded in the tooth groove (19).

9. A forming process for a corrosion-resistant and impact-resistant flange joint for oilfield use, using the corrosion-resistant and impact-resistant flange joint for oilfield use as described in any one of claims 1-8, characterized in that, Includes the following steps: S1: The disc body (1) is coaxially connected to the port of the upper pipe (201) by welding equipment. The bent pipe body (3) and the reinforcing convex ring (6) are integrated structures produced by casting equipment. The thickened reinforcing convex ring (6) at the bend of the bent pipe body (3) can improve the structural strength, so that the bend of the bent pipe body (3) can effectively withstand the impact corrosion of petroleum products. When it is necessary to fix the first connecting mechanism (2) and the tail connecting mechanism (9) on the bent pipe body (3), the upper convex head (202) at the end of the upper pipe (201) is inserted into the mounting groove on the outer wall of the bent pipe body (3), and at the same time, the first convex block (4) at the end of the bent pipe body (3) is also inserted. The upper pipe (201) is inserted into the mounting groove on the outer wall and then welding is performed. Due to the arc structure of the upper protrusion (202) and the first protrusion (4), the welding area outside the interface of the bent pipe (3) is expanded, forming a wave-shaped surrounding welding structure. Compared with the traditional circular welding structure, the welding strength is better. The inside of the bent pipe (3) maintains a circular arc contact surface. At this time, the upper sealing ring (203) will be fitted into the end of the first insert ring (5). The upper sealing ring (203) and the first insert ring (5) are used to protect the circular arc contact surface inside the bent pipe (3), thereby reducing the corrosion of the contact surface of the bent pipe (3) by the oil flowing inside the device. S2: The lower protrusion (904) on the lower connector (901) is embedded in the groove on the lower outer wall of the bent pipe body (3), and the second protrusion (8) at the lower end of the bent pipe body (3) is embedded in the groove on the outer wall of the lower connector (901). Then, the lower connector (901) and the lower end of the bent pipe body (3) are fixedly connected by welding. According to the connection method of the upper end of the bent pipe body (3), the lower end interface of the bent pipe body (3) is also welded on a large area, which improves the structural strength. At the same time, the lower sealing ring (905) is embedded in the second insert ring (7). The lower sealing ring (905) and the second insert ring (7) together protect the interior of the lower end interface of the bent pipe body (3). When the threaded groove (902) on the lower connector (901) is connected to the external pipeline thread, the plastic material strip 903 will improve the sealing and fastening effect. S3: After the upper and lower ends of the bent pipe body (3) are welded, the anti-corrosion coating is sprayed onto the bent pipe body (3), the upper pipe (201) and the lower pipe (901) through the spraying equipment to form a protective coating (10). The receiving sleeve (11) on the disc body (1) is fitted with a tapered sleeve (14) of the oil pipe (15). The tapered sleeve (14) presses the sealing ring (13) tightly onto the receiving sleeve (11). The protective ring (12) at the edge of the end face of the receiving sleeve (11) can protect the sealing ring (13). S4: The bottom ring (2001) is inserted into the disc body (1). The bottom ring (2001) has a bearing ring (2004) with a downward pressure tooth (2003) at the bottom of its inclined groove (2002) fitted inside. The oil pipe (15) and the disc body (1) are connected by bolts (16) and nuts (17). When the nut (17) is rotated and tightened, the pressure ring (18) at the bottom of the nut (17) will rotate synchronously. Because the tooth groove (19) of the pressure ring (18) is embedded with a single tooth, the pressure ring (18) will rotate synchronously. When the nut (17) and pressure ring (18) rotate into position, the spring (2005) will keep the limiting tooth (2007) in place. If the nut (17) is loosened due to vibration or other impact, the pressure ring (18) will drive the bearing ring (2004) and the lower pressure tooth (2003) to move synchronously through the limiting tooth (2007). At this time, the lower pressure tooth (2003) will generate axial anti-loosening pressure in the inclined groove (2002).

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