Double-gas-seal device for petroleum casing joint

Abstract

The utility model discloses a double-gas-seal device for a petroleum casing joint, which particularly relates to the technical field of petroleum casings and comprises a petroleum casing joint, and a double-gas-seal mechanism is arranged on the outer wall of the petroleum casing joint. According to the utility model, the rotating plate is arranged on the outer wall of the rotating rod, the first magnet is arranged on the outer wall of the rotating plate, and the second magnet is arranged on the outer wall of the rotating plate, so that the limiting rod can move in the groove; a double-gas-seal device is arranged at the joint of the two sleeve joints to prevent natural gas leakage, the double-gas-seal device needs to be connected with a gas guide pipe to convey gas in real time to form a gas film, the gas guide pipe needs to be replaced regularly due to the problems of materials and the like of the gas guide pipe, and the joint of the gas guide pipe cannot be locked due to corrosion and the like. And the air guide pipe is convenient to replace.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum casing, in particular to a double air sealing device for a petroleum casing joint. Background Art

[0002] Oil casing is a steel pipe used to support the wellbore of oil and gas wells, ensuring the proper operation of the entire well during drilling and after completion. Each well requires several layers of casing, depending on the drilling depth and geological conditions. Once lowered into the well, casing is cemented. Unlike oil tubing and drill pipe, casing is not reusable and is a disposable material. Consequently, casing consumption accounts for over 70% of all oil well pipes. Casing can be categorized by usage as: guide pipe, surface casing, technical casing, and reservoir casing.

[0003] At present, when the oil casing on the market is used, it is assembled and connected through connection methods such as threaded connection, floating connection, high-frequency resistance welding connection and Jieka connection. In actual use, when the oil casing is threaded together in pairs, there are two commonly used threaded connection methods, one is the matching connection of external thread and internal thread, and the other is the same thread connection. There is a thread at each end of the casing, and the two sections of casing are threaded together by rotation. Because the oil casing mainly transports oil or natural gas, considering the problem of air tightness of the threaded connection, a double air sealing device will be set at the connection of the two casing joints to prevent natural gas leakage. The double air sealing device needs to be connected to the air guide pipe to transport gas in real time to form an air film. Due to problems such as the material of the air guide pipe, the air guide pipe needs to be replaced regularly. The air guide pipe is mostly connected by thread. Because the oil casing is mostly located outside or at the bottom of the wet ground, the air guide pipe connection will cause rust and other locking problems. The air guide pipe needs to be violently dismantled later, causing damage to the double air sealing device and the need for overall replacement. Utility Model Content

[0004] The purpose of the utility model is to provide a double-gas sealing device for a petroleum casing joint to solve the problems raised in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A double air sealing device for a petroleum casing joint comprises a petroleum casing joint, wherein the outer wall of the petroleum casing joint is provided with a double air sealing mechanism, the outer wall of the double air sealing mechanism is provided with a connecting plate, the outer wall of the connecting plate is provided with a communicating groove, an air guide pipe is slidably connected inside the communicating groove, a groove is provided inside the connecting plate, a fixed rod is fixedly connected inside the groove, the outer wall of the fixed rod is rotatably connected to a rotating rod, the outer wall of the rotating rod is fixedly connected to multiple rotating plates, the outer walls of the multiple rotating plates are cross-fixedly connected to a first magnet and a second magnet, a spring is provided between the rotating rod and the groove, a limiting rod is provided inside the groove, the outer wall of the limiting rod is fixedly connected to a movable plate, and the outer wall of the movable plate is fixedly connected to a third magnet.

[0007] Furthermore, one end of the rotating rod passes through the outer wall of the connecting disk and the rotating rod is rotatably connected to the connecting disk. The two ends of the spring are fixedly connected to the inside of the groove and the outer wall of the rotating rod respectively. The addition of the rotating plate enables the rotating rod to drive the first magnet to move.

[0008] Furthermore, a stabilizing rod is slidably connected to the interior of the limit rod and one end of the stabilizing rod is fixedly connected to the interior of the groove. One end of the limit rod passes through the interior of the connecting groove. A limiting groove is provided on the outer wall of the air guide tube and one end of the limit rod is slidably connected to the limiting groove. The addition of the stabilizing rod limits the movement trajectory of the limit rod.

[0009] Furthermore, the double air sealing mechanism includes an upper sealing plate and a lower sealing plate connected to the bottom end of the upper sealing plate by bolts. The outer parts of the upper sealing plate and the lower sealing plate are fixedly connected to the connecting plate. The addition of the spring allows the rotating rod to return to its initial position.

[0010] Furthermore, air film grooves are provided on the outer sides of the upper sealing plate and the lower sealing plate, a connecting pipe is fixedly connected to the bottom end of the upper sealing plate, and a connecting hole is provided on the top end of the lower sealing plate. The addition of the third magnet allows the movable plate to move inside the groove.

[0011] Furthermore, the connecting pipe is slidably connected to the connecting hole. The addition of the connecting pipe makes it easier for gas to enter the lower sealing plate from the upper sealing plate.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. The double air sealing device of the oil casing joint of the present invention can facilitate the subsequent secondary replacement of the gas pipe, by arranging a rotating plate on the outer wall of the rotating rod, arranging a first magnet on the outer wall of the rotating plate, arranging a second magnet on the outer wall of the rotating plate, arranging a stabilizing rod inside the groove, arranging a limiting rod on the outer wall of the stabilizing rod, arranging a movable plate on the outer wall of the limiting rod, and arranging a third magnet on the outer wall of the movable plate, so that the limiting rod can move inside the groove. In the present invention, when the oil casings are threadedly connected in pairs, since the oil casings mainly transport oil or natural gas, considering the problem of air tightness of the threaded connection, a double air sealing device will be arranged at the connection of the two casing joints to prevent natural gas leakage. The double air sealing device needs to be connected to the gas pipe to transport gas in real time to form an air film. Due to problems such as the material of the gas pipe, the gas pipe needs to be replaced regularly. The connection of the gas pipe will not have problems such as rust and other locking problems, making the replacement of the gas pipe more convenient.

[0014] 2. The double air sealing device for the oil casing joint of the utility model can increase the air tightness between the two oil casing joints. By arranging a connecting pipe on the outer wall of the upper sealing plate, a connecting groove on the outer wall of the lower sealing plate, and air film grooves on the outer walls of the lower sealing plate and the upper sealing plate, gas can enter the lower sealing plate from the upper sealing plate. In the utility model, the gas can form a layer of air film between the air film grooves, and the subsequent connection seam between the two oil casing joints can be gas-sealed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] Figure 2 This is a top sectional view of the connection disk of the present invention;

[0017] Figure 3 This is a schematic structural diagram of the double air sealing mechanism of the utility model;

[0018] Figure 4 This is a schematic diagram of the rotating plate structure of the present utility model.

[0019] Numbers in the figure: 1. Oil casing joint; 2. Double air sealing mechanism; 201. Upper sealing plate; 202. Lower sealing plate; 203. Air film groove; 204. Connecting pipe; 205. Connecting hole; 3. Connecting plate; 4. Connecting groove; 5. Air guide pipe; 6. Groove; 7. Fixed rod; 8. Rotating rod; 9. Rotating plate; 10. First magnet; 11. Second magnet; 12. Spring; 13. Limit rod; 14. Moving plate; 15. Third magnet; 16. Stabilizing rod; 17. Limit groove. DETAILED DESCRIPTION

[0020] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0021] Example: See Figure 1 、 Figure 2 and Figure 4 The utility model provides a double gas sealing device for a petroleum casing joint, and the technical solution is as follows:

[0022] A double air sealing device for a petroleum casing joint comprises a petroleum casing joint 1, wherein the outer wall of the petroleum casing joint 1 is provided with a double air sealing mechanism 2, the outer wall of the double air sealing mechanism 2 is provided with a connecting plate 3, the outer wall of the connecting plate 3 is provided with a connecting groove 4, an air guide pipe 5 is slidably connected inside the connecting groove 4, a groove 6 is provided inside the connecting plate 3, a fixing rod 7 is fixedly connected inside the groove 6, the outer wall of the fixing rod 7 is rotatably connected to a rotating rod 8, the outer wall of the rotating rod 8 is fixedly connected to multiple rotating plates 9, the outer walls of the multiple rotating plates 9 are cross-fixedly connected to a first magnet 10 and a second magnet 11, a spring 12 is provided between the rotating rod 8 and the groove 6, a limiting rod 13 is provided inside the groove 6, the outer wall of the limiting rod 13 is fixedly connected to a movable plate 14, and the outer wall of the movable plate 14 is fixedly connected to a third magnet 15.

[0023] In a preferred embodiment, one end of the rotating rod 8 passes through the outer wall of the connecting disk 3 and the rotating rod 8 is rotatably connected to the connecting disk 3. The two ends of the spring 12 are fixedly connected to the inside of the groove 6 and the outer wall of the rotating rod 8 respectively. When the rotating rod 8 moves, the rotating rod 8 will move inside the groove 6, and at the same time, the rotating rod 8 will drive the rotating plate 9 to move.

[0024] In a preferred embodiment, the limiting rod 13 is slidingly connected to the stabilizing rod 16 and one end of the stabilizing rod 16 is fixedly connected to the inside of the groove 6. One end of the limiting rod 13 passes through the inside of the connecting groove 4. A limiting groove 17 is provided on the outer wall of the air guide tube 5 and one end of the limiting rod 13 is slidingly connected to the limiting groove 17. When the limiting rod 13 moves, the limiting rod 13 will move on the stabilizing rod 16, so that the limiting rod 13 can move stably inside the groove 6.

[0025] In a preferred embodiment, the double air sealing mechanism 2 includes an upper sealing plate 201 and a lower sealing plate 202 connected to the bottom end of the upper sealing plate 201 by bolts. The outer sides of the upper sealing plate 201 and the lower sealing plate 202 are fixedly connected to the connecting plate 3. When the rotating rod 8 moves, the rotating rod 8 will move on the outer wall of the fixed rod 7, and at the same time, the rotating rod 8 will drive the spring 12 to move.

[0026] The working principle of the present invention is as follows: when the air guide tube 5 needs to be replaced and installed, the rotating rod 8 is rotated at this time, and the rotating rod 8 rotates on the outer wall of the fixed rod 7. The rotating rod 8 drives the spring 12 to move, so that the spring 12 is twisted, and the rotating rod 8 drives the rotating plate 9 to move. The rotating plate 9 drives the first magnet 10 and the second magnet 11 to move in a circular motion inside the groove 6. The first magnet 10 moves away from the third magnet 15, and the second magnet 11 reaches the side of the third magnet 15. The second magnet 11 and the third magnet 15 attract each other, so that the second magnet 11 moves toward the third magnet 15, and the second magnet 11 drives the movable plate 14 to move, so that the movable plate 14 slides inside the groove 6. The movable plate 14 simultaneously drives the limiting rod 13 to move, so that the limiting rod 13 slides inside the groove 6. The limiting rod 13 slides on the outer wall of the stabilizing rod 16 at the same time. The limiting rod 1 3, one end will be separated from the limiting groove 17. At this time, the air guide tube 5 is pulled and the air guide tube 5 is moved out from the connecting groove 4, so that the end of the new air guide tube 5 with the limiting groove 17 enters the connecting groove 4. At this time, the rotating rod 8 is released, and the elastic force of the spring 12 causes the rotating rod 8 to reset on the fixed rod 7. The rotating rod 8 drives the rotating plate 9 to return to the initial position, and the rotating plate 9 drives the first magnet 10 and the second magnet 11 to reset. At this time, the first magnet 10 reaches the side of the third magnet 15, and the first magnet 10 and the third magnet 15 repel each other, causing the third magnet 15 to move in the opposite direction of the rotating plate 9. The third magnet 15 drives one end of the limiting rod 13 through the movable plate 14 to enter the limiting groove 17. At this time, the position of the air guide tube 5 is convenient to fix. At the same time, a sealing gasket can be added inside the connecting groove 4 according to usage to make the air guide tube 5 easy to disassemble, install and replace.

[0027] See also Figure 1 and Figure 3 The utility model provides a technical solution: a double air sealing device for a petroleum casing joint, wherein an air film groove 203 is provided on the outer sides of the upper sealing plate 201 and the lower sealing plate 202, the bottom end of the upper sealing plate 201 is fixedly connected to a connecting pipe 204, and a connecting hole 205 is provided on the top end of the lower sealing plate 202. When the third magnet 15 moves, the third magnet 15 will drive the movable plate 14 to move, so that the movable plate 14 can return to its initial position.

[0028] In a preferred embodiment, the connecting pipe 204 is slidably connected to the connecting hole 205. When the gas enters the upper sealing plate 201, the gas will enter the connecting groove through the connecting pipe 204, so that the subsequent gas can enter the lower sealing plate 202.

[0029] The working principle of the present utility model is as follows: when the double air sealing mechanism 2 needs to be installed, the interior of the upper sealing plate 201 and the lower sealing plate 202 are in contact with the exterior of the oil casing joint 1, and the air film groove 203 is located on one side of the connection seam between the two oil casing joints 1, and the connecting pipe 204 is made to enter the interior of the connection groove. At this time, the bolt is rotated to connect the upper sealing plate 201 and the lower sealing plate 202. When the subsequent air guide pipe 5 enters the gas, the gas passes through the air guide pipe 5 and the connecting plate 3 into the internal air grooves of the upper sealing plate 201 and the lower sealing plate 202 and the interior of the air film groove 203, so that the gas can form a layer of air film between the air film groove 203, so that the subsequent connection seam between the two oil casing joints 1 can be gas-sealed.

[0030] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A double gas sealing device for a petroleum casing joint, comprising a petroleum casing joint (1), characterized in that: The outer wall of the oil casing joint (1) is provided with a double air sealing mechanism (2), the outer wall of the double air sealing mechanism (2) is provided with a connecting plate (3), the outer wall of the connecting plate (3) is provided with a communicating groove (4), the inner wall of the communicating groove (4) is slidably connected with an air guide pipe (5), the inner wall of the connecting plate (3) is provided with a groove (6), the inner wall of the groove (6) is fixedly connected with a fixing rod (7), the outer wall of the fixing rod (7) is rotatably connected with a rotating rod (8), the outer wall of the rotating rod (8) is fixedly connected with a plurality of rotating plates (9), the outer walls of the plurality of rotating plates (9) are cross-fixedly connected with a first magnet (10) and a second magnet (11), a spring (12) is provided between the rotating rod (8) and the groove (6), the inner wall of the groove (6) is provided with a limiting rod (13), the outer wall of the limiting rod (13) is fixedly connected with a moving plate (14), and the outer wall of the moving plate (14) is fixedly connected with a third magnet (15).

2. The double gas sealing device for petroleum casing joint according to claim 1, characterized in that: One end of the rotating rod (8) passes through the outer wall of the connecting disk (3) and the rotating rod (8) is rotatably connected to the connecting disk (3). The two ends of the spring (12) are fixedly connected to the inside of the groove (6) and the outer wall of the rotating rod (8) respectively.

3. The double gas sealing device for petroleum casing joint according to claim 1, characterized in that: The limiting rod (13) is internally slidably connected to a stabilizing rod (16), and one end of the stabilizing rod (16) is fixedly connected to the inside of the groove (6). One end of the limiting rod (13) passes through the inside of the connecting groove (4). A limiting groove (17) is provided on the outer wall of the air guide tube (5), and one end of the limiting rod (13) is slidably connected to the limiting groove (17).

4. The double air sealing device for petroleum casing joint according to claim 1, characterized in that: The double air sealing mechanism (2) comprises an upper sealing plate (201) and a lower sealing plate (202) connected to the bottom end of the upper sealing plate (201) by bolts, and the exteriors of the upper sealing plate (201) and the lower sealing plate (202) are both fixedly connected to the connecting plate (3).

5. The double air sealing device for petroleum casing joint according to claim 4, characterized in that: Air film grooves (203) are provided on the adjacent exteriors of the upper sealing plate (201) and the lower sealing plate (202); a connecting pipe (204) is fixedly connected to the bottom end of the upper sealing plate (201); and a connecting hole (205) is provided on the top end of the lower sealing plate (202).

6. The double air sealing device for petroleum casing joint according to claim 5, characterized in that: The connecting pipe (204) is slidably connected to the connecting hole (205).

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