Air-tight seal buckle for threaded connection of petroleum pipe

Abstract

The invention discloses a petroleum pipe threaded connection air-tight seal buckle, and particularly relates to the technical field of petroleum pipe threaded connection, the petroleum pipe threaded connection air-tight seal buckle comprises a connecting buckle and an oil sleeve, the connecting buckle is of a cylindrical structure with two open ends, the oil sleeve is in threaded connection with the end of the connecting buckle, and two symmetrically-distributed air grooves and a first seal groove are formed in the connecting buckle; second sealing grooves are formed in the two ends of the connecting buckle correspondingly. A movable sealing assembly is arranged in the connecting buckle, a second sealing piece is arranged in each second sealing groove, a plurality of evenly-distributed air inlet pipes are arranged on the inner wall of the connecting buckle, and the second sealing pieces are communicated with the air grooves through the air inlet pipes. The first sealing piece slides in the adjusting piece, and the second sealing piece seals the bottom of the connecting buckle, so that leakage of gaps caused by connection looseness when the petroleum pipe vibrates under the impact of dynamic load is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of threaded connection of petroleum pipes, and more particularly to a gas-tight seal buckle for threaded connection of petroleum pipes. Background Art

[0002] Threaded joints refer to pipe connectors with threads. They are the most common pipe fittings in industry and life. Threaded joints make pipe connections simpler and easier to disassemble and replace, greatly saving the cost of pipe connection. Oil casing in high-pressure gas wells are also connected through threaded joints. Existing oil pipe threaded connections are all achieved by improving the thread profile to improve the sealing performance between the threaded joint and the oil casing.

[0003] However, in the prior art, during the oil and gas production process, the oil casing will shake when it is placed into the oil well, and the casing will also be subjected to various dynamic loads during oil production, such as vibration and impact. The threaded connection is prone to loosening after a long period of working, resulting in gaps in the sealing part and leakage. Therefore, the present invention proposes an oil pipe threaded connection airtight seal to solve the above problem. Summary of the invention

[0004] In order to overcome the above defects of the prior art, an embodiment of the present invention provides a petroleum pipe threaded connection gas seal buckle, which solves the problems raised in the above background technology by providing a dynamic seal component and a static seal component.

[0005] To achieve the above object, the present invention provides the following technical solution: a gas-tight seal buckle for oil pipe thread connection, comprising a buckle with cylindrical structures at both ends and an oil casing threadedly connected to the end of the buckle, and also comprising: An air groove is provided inside the connecting buckle, and two air grooves are symmetrically arranged; A first sealing groove is provided inside the connecting buckle, and two first sealing grooves are symmetrically arranged; There are two second sealing grooves, which are respectively opened at both ends of the connecting buckle and located on the inner side of the connecting buckle; A dynamic seal assembly, comprising: An adjusting member, which is slidably disposed in the air groove; A first sealing member slidably disposed in the first sealing groove; One end of the adjusting member extends into the corresponding first sealing groove and is connected to the corresponding first sealing member; An end of the first sealing member away from the adjusting member contacts the end of the oil casing; A second sealing member, which is disposed in the second sealing groove, wherein two second sealing members are provided, corresponding to the two second sealing grooves respectively; An air inlet pipe is opened inside the connecting buckle, and a plurality of the air inlet pipes are provided and evenly distributed, and the air inlet pipes are used to connect the second sealing member and the air groove; The adjusting member can cause the second sealing member to deform when sliding inside the air groove.

[0006] Preferably, the adjusting member includes a piston ring slidably connected to the inner wall of the air groove, one end of the piston ring is fixedly connected to a plurality of piston rods, the outer wall of each piston rod is sleeved with a first elastic member, one end of the first elastic member is fixedly connected to an end of the piston ring close to the piston rod, and the other end of the first elastic member is fixedly connected to the inner wall of the air groove close to one end of the first sealing groove.

[0007] Preferably, one end of each piston rod away from the piston ring extends into the first sealing groove, and one end of each piston rod extending into the first sealing groove is commonly fixedly connected to a slider, a slide groove is provided in the slider, a second elastic member is provided inside the slide groove, one end of the second elastic member is fixedly connected to the top of the slide groove, and the other end of the second elastic member is fixedly connected to one end of the first sealing member away from the oil casing.

[0008] Preferably, threads are symmetrically arranged at both ends of the connecting buckle along the middle section, and the threads at each end are divided into two sections, and a static sealing assembly is arranged between the two sections of internal threads.

[0009] Preferably, the static sealing assembly includes a third sealing member and a fourth sealing member, the third sealing member is fixedly connected to the inner wall of the connecting buckle, the fourth sealing member is movably connected to the third sealing member, and the fourth sealing member is in contact with the inner wall of the oil casing.

[0010] Preferably, the third sealing member and the fourth sealing member are both provided with stepped grooves inside, and the stepped grooves of the third sealing member and the fourth sealing member are alternately embedded in each other.

[0011] Preferably, the outer wall of the air groove is provided with a plurality of exhaust ports, which respectively correspond to the air inlet pipes, and the second sealing member is provided with a plurality of air inlet ports, which respectively correspond to the air inlet pipes.

[0012] Preferably, a plurality of exhaust pipes are provided inside the connecting buckle, and the exhaust pipes are respectively connected to the air inlet pipes.

[0013] Preferably, a limiting groove is provided inside the connecting buckle, a baffle is slidably connected inside the limiting groove, and a through hole corresponding to the exhaust hole is provided on the baffle.

[0014] Preferably, when the baffle slides to the extreme position inside the connecting buckle, the through hole is connected with the exhaust hole, and when the baffle slides to the extreme position outside the connecting buckle, the exhaust hole is sealed.

[0015] Technical effects and advantages of the present invention: 1. The present invention prevents leakage from the gap caused by loose connection when the oil pipe vibrates in the axial direction by sliding the first sealing member inside the adjusting member.

[0016] 2. The present invention forms a multi-stage track through the cooperation of static seals, which reduces the flow rate and pressure during leakage and increases the sealing effect. At the same time, the bottom of the connector is sealed through the second seal to prevent leakage caused by vibration of the oil pipe in the radial direction.

[0017] 3. The present invention provides an exhaust pipe and a baffle, so that the second seal is sealed after the oil casing is completely inserted into the connecting buckle. When the oil casing is detached, the gas of the second seal is discharged, thereby reducing the friction between the oil casing and the seal and increasing the service life of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a cross-sectional view of the overall structure of the connecting buckle of the present invention.

[0020] Figure 3 It is a cross-sectional view of the oil casing and the connecting buckle of the present invention when connected.

[0021] Figure 4 For the present invention Figure 3 A-section structure enlarged view.

[0022] Figure 5 It is a cross-sectional view of the oil casing of the present invention when it is not connected to the connecting port.

[0023] Figure 6 For the present invention Figure 5 Enlarged view of the structure of part B.

[0024] Figure 7 It is a cross-sectional view of the overall structure of the adjusting member of the present invention.

[0025] Figure 8 For the present invention Figure 3 Enlarged view of the C structure.

[0026] Fig. 9 It is a cross-sectional view of the overall structure of the third sealing member and the fourth sealing member of the present invention.

[0027] The accompanying drawings are marked as follows: 1. connecting buckle; 11. air groove; 12. first sealing groove; 13. second sealing groove; 14. air inlet pipe; 15. exhaust pipe; 16. limit groove; 17. baffle; 171. through hole; 2. dynamic sealing assembly; 21. adjusting member; 211. piston ring; 212. piston rod; 213. slider; 214. slide groove; 22. first sealing member; 23. second sealing member; 231. air inlet; 24. first elastic member; 25. second elastic member; 3. oil casing; 4. static sealing assembly; 41. third sealing member; 42. fourth sealing member. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0029] In actual use, the casing is also subjected to various dynamic loads during oil production, such as vibration, impact, etc. The threaded connection is prone to loosening after long-term working, resulting in gaps in the sealing part and leakage. This embodiment is specially invented to solve the above problem.

[0030] See also Figure 1 and Figure 2 As shown, an embodiment of the present invention is a gas-tight seal for oil pipe thread connection, comprising a connector 1 and an oil casing 3. The connector 1 is a cylindrical structure with two ends open. The oil casing 3 is threadedly connected to the end of the connector 1. Two symmetrically distributed air grooves 11 and a first sealing groove 12 are provided inside the connector 1. Second sealing grooves 13 are provided at both ends of the connector 1. Figure 5 and Figure 6 As shown, a dynamic sealing assembly 2 is provided in the connecting buckle 1, and the dynamic sealing assembly 2 includes an adjusting member 21 slidably connected to the corresponding gas groove 11, one end of the adjusting member 21 extends into the first sealing groove 12, and the end of the adjusting member 21 extending into the corresponding first sealing groove 12 is provided with a first sealing member 22. Figure 3 and Figure 4 As shown, one end of the first seal 22 away from the adjusting member 21 contacts the end of the oil casing 3; a second seal 23 is arranged inside each second sealing groove 13, and a plurality of evenly distributed air intake pipes 14 are opened inside the connecting buckle 1, and the second seal 23 is connected to the air groove 11 through the air intake pipe 14; when the adjusting member 21 slides inside the air groove 11, the second seal 23 can be deformed, wherein the first seal 22 and the second seal 23 are both made of elastic materials.

[0031] See also Figure 4 As shown, the adjusting member 21 includes a piston ring 211 which is slidably connected to the inner wall of the air groove 11, and one end of the piston ring 211 is fixedly connected to a plurality of piston rods 212, and the outer wall of each piston rod 212 is sleeved with a first elastic member 24, one end of the first elastic member 24 is fixedly connected to one end of the piston ring 211 close to the piston rod 212, and the other end of the first elastic member 24 is fixedly connected to the inner wall of the air groove 11 close to one end of the first sealing groove 12, wherein the first elastic member 24 is a spring.

[0032] See also Figure 6 and Figure 7 As shown, one end of each piston rod 212 away from the piston ring 211 extends into the first sealing groove 12, and one end of each piston rod 212 extending into the first sealing groove 12 is fixedly connected with a slider 213, a slide groove 214 is provided inside the slider 213, a second elastic member 25 is arranged inside the slide groove 214, one end of the second elastic member 25 is fixedly connected to the top of the slide groove 214, and the other end of the second elastic member 25 is fixedly connected to one end of the first sealing member 22 away from the oil casing 3, wherein the second elastic member 25 is a spring, and the slider 213 is clearance-matched with the first sealing groove 12.

[0033] When in use, firstly extend the threaded end of the oil casing 3 into the interior of the connecting buckle 1, and gradually fix the oil casing 3 to the connecting buckle 1 through threaded engagement. During the installation of the oil casing 3, when the end of the oil casing 3 contacts the first sealing member 22, the oil casing 3 continues to move into the interior of the connecting buckle 1, so that the first sealing member 22 slides in the first sealing groove 12, and at the same time, the first sealing member 22 slides in the slide groove 214 toward the piston rod 212, so that the second elastic member 25 is compressed. As the second elastic member 25 is gradually compressed, the pressure on the slider 213 gradually increases. When the pressure on the slider 213 is greater than that on the first elastic member The elastic force of 24 drives the slider 213 to slide in the first sealing groove 12 through the second elastic member 25, and the slider 213 pushes the piston rod 212 to drive the piston ring 211 to slide in the air groove 11, so that the first elastic member 24 is relaxed, and the gas in the air groove 11 enters the second sealing member 23 through the intake pipe 14, and the second sealing member 23 gradually expands. When the oil casing 3 vibrates in the axial direction and causes the threaded connection to loosen, the second elastic member 25 is relaxed so that the first sealing member 22 and the oil casing 3 are always in a sealed state, so as to prevent the oil casing 3 from vibrating in the axial direction due to the action of dynamic load during the oil production process, causing the threaded connection to loosen and causing oil and gas leakage. Example 2

[0034] It is found in actual use that when the oil casing 3 vibrates in the radial direction due to the action of dynamic load, the sealing effect of the first sealing member 22 is poor, resulting in leakage. Further improvements are made on the basis of the above embodiment.

[0035] See also Figure 3 and Figure 5 As shown, the two ends of the connecting buckle 1 are symmetrically provided with threads along the middle section, and the threads at each end are divided into two sections, and a static sealing component 4 is provided between the two sections of internal threads. Figure 8 and Fig. 9 As shown, the static sealing assembly 4 includes a third seal 41 and a fourth seal 42. The third seal 41 is fixedly connected to the inner wall of the connecting buckle 1, and the fourth seal 42 is movably connected to the third seal 41. The fourth seal 42 contacts the inner wall of the oil casing 3. The third seal 41 and the fourth seal 42 are both provided with stepped grooves. The stepped grooves of the third seal 41 and the fourth seal 42 are alternately embedded in each other, wherein the third seal 41 and the fourth seal 42 are both made of elastic material.

[0036] On the basis of the above embodiment, when in use, when the oil casing 3 is completely installed inside the connecting buckle 1, the third seal 41 and the fourth seal 42 are squeezed. When the oil casing 3 vibrates radially and causes oil and gas to leak to the static seal assembly 4, a small gap is generated between the third seal 41 and the fourth seal 42 due to the radial vibration, so that the leaked oil and gas enter between the third seal 41 and the fourth seal 42, and the stepped grooves inside the third seal 41 and the fourth seal 42 are mutually embedded to form a multi-layer sealing maze, which changes the flow direction of the leaked oil and gas and buffers the pressure at the oil and gas leakage point. At the same time, due to the slight deviation caused by the radial vibration of the oil casing 3, the gas inside the second seal 23 can be squeezed, so that the gas inside the second seal 23 moves and flows from the squeezed side to the non-squeezed side, thereby ensuring that the second seal 23 is always in a sealed state with the oil casing 3, and preventing the oil and gas leakage caused by the insufficient sealing of the first seal 22 when the oil casing 3 generates radial vibration due to dynamic load. Example 3

[0037] In actual use, it is found that during the installation and removal of the oil casing 3, the threaded outer wall will rub the seal during the removal process, reducing the service life of the seal and increasing the risk of oil and gas leakage. Further improvements are made on the basis of the above embodiment.

[0038] See also Figure 3 As shown, the outer wall of the air groove 11 is provided with a plurality of exhaust ports, which correspond to the air inlet pipes 14 respectively. The second sealing member 23 is provided with a plurality of air inlet ports 231, which correspond to the air inlet pipes 14 respectively. Figure 4As shown, a plurality of exhaust pipes 15 are provided inside the connecting buckle 1, and the exhaust pipes 15 are respectively connected to the intake pipes 14, and the first sealing member 22 can seal the exhaust pipes 15 by sliding.

[0039] See also Figure 4 As shown, the connection buckle 1 has a limit groove 16 inside, and a baffle 17 is slidably connected inside the limit groove 16. The baffle 17 has a through hole 171 corresponding to the exhaust hole. Figure 6 As shown, when the baffle 17 slides to the extreme position inside the connecting buckle 1, the through hole 171 is connected with the exhaust hole, and when the baffle 17 slides to the extreme position outside the connecting buckle 1, the exhaust hole is sealed.

[0040] On the basis of the above embodiment, when in use, when the piston ring 211 slides inside the gas groove 11, the gas inside the gas groove 11 is compressed. When the piston ring 211 moves to contact the baffle 17, the piston ring 211 pushes the baffle 17 to move inside the connecting buckle 1, so that the gas inside the limit groove 16 is compressed. When the piston ring 211 moves to the limit position, the oil casing 3 is completely installed inside the connecting buckle 1. At this time, the exhaust pipe 15 is sealed by the first sealing member 22, and the through hole 171 is connected to the exhaust hole of the gas groove 11. The gas enters the second sealing member 23 through the intake pipe 14, so that the second sealing member 23 is The seal 23 expands and seals tightly with the oil casing 3. When the oil casing 3 is taken out after oil production is completed, as the oil casing 3 is gradually taken out, the second elastic member 25 gradually relaxes, causing the first seal 22 to slide to the outside of the connecting buckle 1. The exhaust pipe 15 is no longer sealed due to the movement of the first seal 22, so that the gas inside the second seal 23 is quickly discharged, causing the second seal 23 to contract. After the oil casing 3 completely enters the connecting buckle 1, air is supplied to the second seal 23, and the gas from the second seal 23 is discharged when the oil casing 3 is detached, thereby reducing the friction between the oil casing 3 and the seal and increasing the service life of the seal.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A gas-tight seal for a petroleum pipe threaded connection, comprising a connection buckle (1) with cylindrical structures at both ends and an oil casing (3) threadedly connected to the ends of the connection buckle (1), characterized in that: Also includes: An air groove (11) is provided inside the connecting buckle (1), and two air grooves (11) are symmetrically arranged; A first sealing groove (12) is provided inside the connecting buckle (1), and two first sealing grooves (12) are symmetrically arranged; Two second sealing grooves (13) are provided, respectively opened at two ends of the connecting buckle (1) and located on the inner side of the connecting buckle (1); A dynamic seal assembly (2) comprising: An adjusting member (21) slidably disposed in the air groove (11); A first sealing member (22) slidably disposed in the first sealing groove (12); One end of the adjusting member (21) extends into the corresponding first sealing groove (12) and is connected to the corresponding first sealing member (22); An end of the first sealing member (22) away from the adjusting member (21) contacts an end of the oil casing (3); A second sealing member (23) disposed in the second sealing groove (13), wherein two second sealing members (23) are provided, corresponding to the two second sealing grooves (13) respectively; An air intake pipe (14) is disposed inside the connecting buckle (1), and a plurality of the air intake pipes (14) are provided and evenly distributed. The air intake pipes (14) are used to connect the second sealing member (23) and the air groove (11); When the adjusting member (21) slides inside the air groove (11), the second sealing member (23) can be deformed; The regulating member (21) comprises a piston ring (211) slidably connected to the inner wall of the air groove (11); one end of the piston ring (211) is fixedly connected to a plurality of piston rods (212); the outer wall of each piston rod (212) is sleeved with a first elastic member (24); one end of each first elastic member (24) is fixedly connected to an end of the piston ring (211) close to the piston rod (212); and the other end of each first elastic member (24) is fixedly connected to the inner wall of one end of the air groove (11) close to the first sealing groove (12).

2. The gas-tight seal for oil pipe threaded connection according to claim 1, characterized in that: One end of each piston rod (212) away from the piston ring (211) extends into the first sealing groove (12), and one end of each piston rod (212) extending into the first sealing groove (12) is fixedly connected to a slider (213), a slide groove (214) is provided in the slider (213), a second elastic member (25) is provided inside the slide groove (214), one end of the second elastic member (25) is fixedly connected to the top end of the slide groove (214), and the other end of the second elastic member (25) is fixedly connected to one end of the first sealing member (22) away from the oil casing (3).

3. The gas-tight seal for oil pipe threaded connection according to claim 2, characterized in that: The two ends of the connecting buckle (1) are symmetrically provided with threads along the middle section, the threads at each end are divided into two sections, and a static sealing component (4) is provided between the two sections of internal threads.

4. The gas-tight seal for oil pipe threaded connection according to claim 3, characterized in that: The static sealing assembly (4) comprises a third sealing member (41) and a fourth sealing member (42), wherein the third sealing member (41) is fixedly connected to the inner wall of the connecting buckle (1), the fourth sealing member (42) is movably connected to the third sealing member (41), and the fourth sealing member (42) is in contact with the inner wall of the oil casing (3).

5. The gas-tight seal for oil pipe threaded connection according to claim 4, characterized in that: The third sealing member (41) and the fourth sealing member (42) are both provided with stepped grooves inside, and the stepped grooves of the third sealing member (41) and the fourth sealing member (42) are alternately embedded in each other.

6. The gas-tight seal for oil pipe threaded connection according to claim 5, characterized in that: The outer wall of the air groove (11) is provided with a plurality of exhaust ports, each of which corresponds to the air intake pipe (14); the second sealing member (23) is provided with a plurality of air intake ports (231), each of which corresponds to the air intake pipe (14).

7. The gas-tight seal for oil pipe threaded connection according to claim 6, characterized in that: A plurality of exhaust pipes (15) are provided inside the connecting buckle (1), and the exhaust pipes (15) are respectively connected to the air inlet pipes (14).

8. The gas-tight seal for oil pipe threaded connection according to claim 7, characterized in that: A limiting groove (16) is provided inside the connection buckle (1), a baffle (17) is slidably connected inside the limiting groove (16), and a through hole (171) corresponding to the exhaust hole is provided on the baffle (17).

9. The gas-tight seal for oil pipe threaded connection according to claim 8, characterized in that: When the baffle (17) slides to the extreme position inside the connecting buckle (1), the through hole (171) is connected to the exhaust hole, and when the baffle (17) slides to the extreme position outside the connecting buckle (1), the exhaust hole is sealed.

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