Thermal recovery wellhead device with good air tightness

Abstract

The invention relates to the technical field of thermal recovery well mouths, in particular to a thermal recovery well mouth device with good air tightness, which comprises a sealing cylinder body, a mounting flange is fixedly mounted at the lower end of the sealing cylinder body, a sealing assembly is arranged at the lower end of the mounting flange, and a sealing cylinder cover is arranged at the upper end of the sealing cylinder body. The sealing cylinder body and the sealing cylinder cover are fixedly installed through a plurality of fastening assemblies which are arranged at equal intervals. And a groove is formed in the inner side of the sealing cylinder body, and the groove is filled with a sealing packing. By adopting the advanced sealing technology and structural design, the sealing performance of the device is remarkably improved, gas leakage is effectively prevented, and medium loss and energy loss are reduced. And meanwhile, the firm and stable structure ensures the long-term stable operation of the equipment in a high-pressure and high-temperature environment. And an accurate pressure control system is also arranged, so that the internal pressure can be monitored and adjusted in real time, and the equipment is ensured to operate in a safe range.

Description

Technical Field

[0001] The invention relates to the technical field of thermal recovery wellheads, and in particular to a thermal recovery wellhead device with good air tightness. Background Art

[0002] Oil production engineering is the general term for various engineering and technical measures taken on oil reservoirs through production wells and injection wells according to development objectives during the oil field exploitation process. As a comprehensive applied discipline, it studies the theory, engineering design methods and implementation techniques of various engineering and technical measures that can be used economically and effectively on oil reservoirs to increase oil well production and crude oil recovery rate.

[0003] In the process of oil extraction, thermal recovery technology has become an effective means of extraction, especially for those oil reservoirs that are difficult to extract under normal conditions. Thermal recovery technology makes crude oil easier to extract through artificial heating, thereby improving the recovery rate. As a key component of the thermal recovery system, the performance of the thermal recovery wellhead device directly affects the efficiency and safety of thermal recovery operations.

[0004] Traditional thermal wellhead devices have certain deficiencies in terms of sealing performance, structural stability, and pressure control. For example, poor sealing performance may lead to gas leakage, which not only wastes resources but also pollutes the environment. At the same time, structural instability may cause equipment failure under high pressure and high temperature environments, affecting the mining progress. In addition, traditional pressure control systems are often not accurate enough to monitor and adjust internal pressure in real time, which poses certain safety risks. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and propose a thermal recovery wellhead device with good airtightness. By adopting advanced sealing technology and structural design, the sealing performance of the device is significantly improved, gas leakage is effectively prevented, and the loss of medium and energy is reduced. At the same time, its strong and stable structure ensures the long-term stable operation of the equipment under high pressure and high temperature environment. It is also equipped with a precise pressure control system that can monitor and adjust the internal pressure in real time to ensure that the equipment operates within a safe range.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A thermal recovery wellhead device with good air tightness comprises a sealing cylinder, a mounting flange is fixedly mounted on the lower end of the sealing cylinder, a sealing assembly is arranged on the lower end of the mounting flange, a sealing cylinder cover is arranged on the upper end of the sealing cylinder, and the sealing cylinder and the sealing cylinder cover are fixedly mounted by a plurality of fastening assemblies arranged at equal intervals; a groove is provided on the inner side of the sealing cylinder, a sealing packing is filled inside the groove, a clamping assembly for clamping the sealing packing is arranged inside the groove; a pressure relief exhaust port is provided on the upper end of the sealing cylinder cover, a sealing ring is sleeved on the outer side of the sealing cylinder cover, and an opening and closing assembly for opening or closing the pressure relief exhaust port is arranged on the upper end of the sealing cylinder cover; a pressure gauge for detecting the pressure in the sealing cylinder is fixedly mounted on the upper end of the sealing cylinder cover.

[0007] As a further improvement of the present invention, the fastening assembly includes the first fixing block fixedly mounted on the side wall of the sealing cylinder body, the side wall of the sealing cylinder cover is fixedly mounted with a second fixing block corresponding to the first fixing block, a fastening screw is penetrated between the first fixing block and the second fixing block, and both ends of the fastening screw are threadedly connected with fastening nuts.

[0008] As a further improvement of the present invention, both ends of the fastening screw are threaded portions, and the middle portion is a non-threaded portion.

[0009] As a further improvement of the present invention, a plurality of protective sleeves are fixedly mounted on the side wall of the sealing cylinder, and a through hole for a fastening screw to pass through is opened in the middle of the protective sleeve.

[0010] As a further improvement of the present invention, the clamping assembly includes a plurality of mounting plates fixedly mounted on the inner side of the groove at equal intervals, the inner side of the groove is slidably connected with a clamping plate, and the mounting plate and the clamping plate are elastically connected via a compression spring.

[0011] As a further improvement of the present invention, a plurality of pressing plates are fixedly mounted on the outer side of the sealing cylinder cover, and each of the pressing plates corresponds to a gap between two adjacent mounting plates.

[0012] As a further improvement of the present invention, the opening and closing assembly includes an electric push rod fixedly mounted on the upper end of the sealing cylinder cover, a connecting plate is fixedly mounted on the telescopic end of the electric push rod, a closing plate is fixedly mounted on the lower end of the connecting plate, and the other end of the closing plate extends into the pressure relief exhaust port.

[0013] As a further improvement of the present invention, an opening for sliding of the closing plate is provided on the outer side of the pressure relief vent, and an arc groove matched with the side of the closing plate is provided on the inner side of the pressure relief vent, which further improves the stability of the closing plate.

[0014] As a further improvement of the present invention, a guide rail is provided at the upper end of the sealing cylinder cover, a guide slider is fixedly mounted at the lower end of the closing plate, and the guide slider slides inside the guide rail.

[0015] As a further improvement of the present invention, the sealing assembly includes a slide groove opened at the lower end of the mounting flange, a slide plate is slidably connected to the inner side of the slide groove, the slide plate and the slide groove are elastically connected by a plurality of return springs, a sealing mounting groove is opened at the lower end of the mounting flange, a sealing airbag is fixedly installed inside the sealing mounting groove, and the slide groove and the sealing airbag are connected by a connecting pipe; a limiting plate is fixedly installed on the outer side of the slide plate, a limiting groove matched with the limiting plate is opened on the inner side of the slide groove, and the limiting plate slides in the limiting groove.

[0016] Compared with the prior art, the advantages of the present invention are: By combining the sealing packing with the compression assembly, the close contact between the sealing cylinder and the sealing cylinder cover is ensured, effectively preventing the gas leakage problem. At the same time, the use of the sealing ring further improves the air tightness and sealing effect of the device, reducing the loss of the medium and energy; The design of the fastening assembly, including the first fixing block, the second fixing block, the fastening screw and the fastening nut, ensures a firm connection between the sealing cylinder and the sealing cylinder cover. The protective sleeve provides additional protection and support for the fastening screw to prevent it from being damaged during long-term use; The pressure gauge can monitor the pressure changes in the sealed cylinder in real time, providing important reference information for operators. When the pressure rises abnormally, the electric push rod can respond quickly, push the closing plate to open the pressure relief vent, release the internal medium, and protect the safety of equipment and personnel. In addition, the design of the guide rail and guide slider ensures the stability and accuracy of the closing plate during the opening and closing process.

[0017] The present invention significantly improves the sealing performance of the device by adopting advanced sealing technology and structural design, effectively preventing gas leakage, reducing the loss of medium and energy. At the same time, its strong and stable structure ensures the long-term stable operation of the equipment under high pressure and high temperature environment. It is also equipped with a precise pressure control system that can monitor and adjust the internal pressure in real time to ensure that the equipment operates within a safe range. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a thermal recovery wellhead device with good air tightness proposed by the present invention; Figure 2 A side view schematic diagram of a thermal recovery wellhead device with good air tightness proposed by the present invention; Figure 3This is a schematic structural diagram of a sealing pipe body of a thermal recovery wellhead device with good air tightness proposed by the present invention; Figure 4 This is a schematic structural diagram of a sealing cylinder cover of a thermal recovery wellhead device with good air tightness proposed by the present invention; Figure 5 The present invention provides a schematic cross-sectional structure diagram of a mounting flange of a thermal recovery wellhead device with good air tightness.

[0019] In the figure: 1 sealing cylinder, 2 mounting flange, 3 first fixing block, 4 protective sleeve, 5 fastening nut, 6 fastening screw, 7 clamping plate, 8 mounting plate, 9 groove, 10 sealing cylinder cover, 11 sealing ring, 12 pressure plate, 13 second fixing block, 14 pressure gauge, 15 pressure relief exhaust port, 16 electric push rod, 17 closing plate, 18 guide rail, 19 sealing packing, 20 compression spring, 21 connecting plate, 22 guide slider, 23 sealing airbag, 24 sealing mounting groove, 25 limiting groove, 26 slide groove, 27 slide plate, 28 connecting pipe, 29 limiting plate, 30 reset spring. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] Reference Figure 1-Figure 5 A thermal recovery wellhead device with good air tightness comprises a sealing cylinder 1, a mounting flange 2 is fixedly mounted on the lower end of the sealing cylinder 1, a sealing assembly is arranged on the lower end of the mounting flange 2, the sealing assembly comprises a slide groove 26 arranged on the lower end of the mounting flange 2, a slide plate 27 is slidably connected to the inner side of the slide groove 26, the slide plate 27 and the slide groove 26 are elastically connected through a plurality of return springs 30, a sealing mounting groove 24 is arranged on the lower end of the mounting flange 2, a sealing airbag 23 is fixedly mounted inside the sealing mounting groove 24, and the slide groove 26 and the sealing airbag 23 are connected through a connecting pipe 28; a limiting plate 29 is fixedly mounted on the outer side of the slide plate 27, a limiting groove 25 adapted to the limiting plate 29 is arranged on the inner side of the slide groove 26, and the limiting plate 29 is located in the limiting groove 25 and slides; When the mounting flange 2 is fixedly installed, the mounting flange 2 is in contact with the thermal wellhead, and the slide plate 27 is pressed and contracted, so that the return spring 30 is in a compressed state. At this time, the air in the slide groove 26 can be discharged into the sealing airbag 23 through the connecting pipe 28, so that the sealing airbag 23 is expanded and closely fits with the thermal wellhead to achieve a sealing effect, until the mounting flange 2 is installed, the sealing airbag 23 stops expanding, and the best sealing effect is achieved; A sealing cylinder cover 10 is provided at the upper end of the sealing cylinder 1. The sealing cylinder 1 and the sealing cylinder cover 10 are fixedly installed by a plurality of fastening components arranged at equal intervals, thereby ensuring a tight connection between the two. The fastening components include the first fixing block 3 fixedly installed on the side wall of the sealing cylinder 1. The side wall of the sealing cylinder cover 10 is fixedly installed with a second fixing block 13 corresponding to the first fixing block 3. A fastening screw 6 is provided between the first fixing block 3 and the second fixing block 13. Both ends of the fastening screw 6 are threadedly connected with fastening nuts 5. By rotating the fastening nut 5, the sealing cylinder 1 and the sealing cylinder cover 10 can be tightly fixed together. Both ends of the fastening screw 6 are threaded portions, and the middle portion is a non-threaded portion. An anti-loosening washer can be provided between the fastening nut 5 and the first fixing block 3 or the second fixing block 13, thereby effectively preventing loosening problems caused by vibration or temperature changes. When installing the sealing cylinder 1 and the sealing cylinder cover 10, the fastening screw 6 is passed through the first fixing block 3 and the second fixing block 13, and then the fastening nut 5 is rotated to tightly fix the sealing cylinder 1 and the sealing cylinder cover 10. In this process, it is necessary to ensure that the fastening nut 5 is fully tightened, and a locking washer is added to enhance the stability of the connection; A plurality of protective sleeves 4 are fixedly mounted on the side wall of the sealing cylinder 1. A through hole for the fastening screw 6 to pass through is opened in the middle of the protective sleeve 4. The protective sleeve 4 provides additional protection and support for the fastening screw 6 to ensure that it will not be damaged during long-term use. A groove 9 is formed on the inner side of the sealing cylinder 1. The groove 9 is filled with a sealing packing 19 to provide the main sealing function. The sealing packing 19 is usually woven from soft threads and is compressed to achieve a sealing effect. The sealing packing 19 between the sealing cylinder 1 and the sealing cylinder cover 10 maintains close contact to prevent gas leakage. The sealing packing 19 is usually woven from soft threads and achieves a sealing effect by compression. The sealing packing 19 is a graphite packing with excellent lubricity, high temperature resistance, high pressure resistance, wear resistance, and high strength. A clamping assembly for clamping the sealing packing 19 is arranged inside the groove 9, ensuring the stability and durability of the sealing effect. The clamping assembly includes a plurality of mounting plates 8 fixedly mounted on the inner side of the groove 9 at equal intervals. A clamping plate 7 is slidably connected to the inner side of the groove 9. The mounting plate 8 and the clamping plate 7 are elastically connected by a compression spring 20. The compression spring 20 applies pressure to the clamping plate 7 through the mounting plate 8, so that the clamping plate 7 presses the sealing packing 19 tightly between the sealing cylinder cover 10 and the sealing cylinder body 1, ensuring a good sealing effect. A plurality of pressing plates 12 are fixedly mounted on the outer side of the sealing cylinder cover 10, each pressing plate 12 corresponds to the gap between two adjacent mounting plates 8, and is used to further fix or assist the work of the clamping assembly, thereby improving the sealing effect of the sealing packing 19. A pressure relief vent 15 is provided at the upper end of the sealing cylinder cover 10, which is used to release the internal medium when the pressure is too high to protect the safety of equipment and personnel. A sealing ring 11 is sleeved on the outer side of the sealing cylinder cover 10, which further improves the air tightness and sealing effect of the device. An opening and closing assembly for opening or closing the pressure relief vent 15 is provided at the upper end of the sealing cylinder cover 10. The opening and closing assembly includes an electric push rod 16 fixedly installed on the upper end of the sealing cylinder cover 10, a connecting plate 21 is fixedly installed on the telescopic end of the electric push rod 16, and a closing plate 17 is fixedly installed on the lower end of the connecting plate 21. The other end of the closing plate 17 extends into the pressure relief vent 15. An opening for sliding the closing plate 17 is provided on the outer side of the pressure relief vent 15. An arc groove adapted to the side of the closing plate 17 is provided on the inner side of the pressure relief vent 15. The other end of the closing plate 17 extends into the arc groove in the pressure relief vent 15, thereby realizing reliable closure of the pressure relief vent 15 and further improving the stability of the closing plate 17. A guide rail 18 is provided at the upper end of the sealing cylinder cover 10, and a guide slider 22 is fixedly installed at the lower end of the closing plate 17. The guide slider 22 slides inside the guide rail 18 to ensure the stability and accuracy of the closing plate 17 during the opening and closing process. A pressure gauge 14 for detecting the pressure inside the sealing cylinder 1 is fixedly mounted on the upper end of the sealing cylinder cover 10 to monitor the change of the internal pressure in real time.

[0023] When the present invention is used, the sealing cylinder 1 is first firmly fixed at the thermal wellhead through the mounting flange 2, and then the sealing cylinder cover 10 is securely placed on the sealing cylinder 1. The first fixing block 3, the second fixing block 13, the fastening screw 6 and the fastening nut 5 in the fastening assembly are used to tightly fix the two. In this process, it is necessary to ensure that the fastening nut 5 is fully tightened, and a locking washer is added to enhance the stability of the connection. At the same time, the design of the protective sleeve 4 provides comprehensive protection for the fastening screw 6 to ensure that it is not damaged; In addition, during the installation of the sealing cylinder cover 10 and the sealing cylinder body 1, the pressing plate 12 contacts the abutting plate 7 and presses it downward, thereby further compressing the sealing packing 19 to ensure the sealing effect.

[0024] Next, the pressure in the sealed cylinder 1 is continuously monitored by the pressure gauge 14. Once an abnormal pressure increase is found, countermeasures must be taken immediately. When the pressure in the sealed cylinder 1 exceeds the safe range, the electric push rod 16 will respond quickly and push the closing plate 17 to open, so that the gas can be discharged smoothly through the pressure relief vent 15. At this time, it is necessary to pay close attention to the discharge of the pressure relief vent 15 to ensure smooth and unobstructed gas discharge. Once the pressure drops to a safe level, the electric push rod 16 will automatically reset and re-close the pressure relief vent 15 to prepare for the subsequent opening operation of the sealed cylinder cover 10.

[0025] In addition, the ingenious design of the guide slider 22 and the guide rail 18 plays a key guiding role in the sliding process of the closing plate 17, ensuring the stability and accuracy of the sliding of the closing plate 17.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] The above are only preferred specific implementation modes 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 solutions and inventive concepts 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 thermal recovery wellhead device with good air tightness, characterized in that: The invention comprises a sealing cylinder (1), a mounting flange (2) being fixedly mounted at the lower end of the sealing cylinder (1), a sealing assembly being arranged at the lower end of the mounting flange (2), a sealing cylinder cover (10) being arranged at the upper end of the sealing cylinder (1), and the sealing cylinder (1) and the sealing cylinder cover (10) being fixedly mounted via a plurality of fastening assemblies arranged at equal intervals; a groove (9) being provided on the inner side of the sealing cylinder (1), a sealing packing (19) being filled in the interior of the groove (9), and a pressing assembly for pressing the sealing packing (19) being arranged in the interior of the groove (9); a pressure relief vent (15) being provided on the upper end of the sealing cylinder cover (10), a sealing ring (11) being sleeved on the outer side of the sealing cylinder cover (10), and an opening and closing assembly for opening or closing the pressure relief vent (15) being arranged on the upper end of the sealing cylinder cover (10); and a pressure gauge (14) for detecting the pressure inside the sealing cylinder (1) being fixedly mounted on the upper end of the sealing cylinder cover (10).

2. A thermal recovery wellhead device with good airtightness according to claim 1, characterized in that: The fastening assembly comprises a first fixing block (3) fixedly mounted on a side wall of the sealing cylinder (1); a second fixing block (13) corresponding to the first fixing block (3) is fixedly mounted on the side wall of the sealing cylinder cover (10); a fastening screw (6) is provided between the first fixing block (3) and the second fixing block (13); and fastening nuts (5) are threadedly connected to both ends of the fastening screw (6).

3. A thermal recovery wellhead device with good airtightness according to claim 2, characterized in that: The two ends of the fastening screw (6) are threaded portions, and the middle portion is a non-threaded portion.

4. A thermal recovery wellhead device with good airtightness according to claim 2, characterized in that: A plurality of protective sleeves (4) are fixedly mounted on the side wall of the sealing cylinder (1), and a through hole for a fastening screw (6) to pass through is provided in the middle of the protective sleeve (4).

5. A thermal recovery wellhead device with good air tightness according to claim 1, characterized in that: The clamping assembly comprises a plurality of mounting plates (8) fixedly mounted at equal intervals on the inner side of the groove (9), the inner side of the groove (9) being slidably connected to a clamping plate (7), and the mounting plate (8) and the clamping plate (7) are elastically connected via a compression spring (20).

6. A thermal recovery wellhead device with good air tightness according to claim 5, characterized in that: A plurality of pressing plates (12) are fixedly mounted on the outer side of the sealing cylinder cover (10), and each pressing plate (12) corresponds to a gap between two adjacent mounting plates (8).

7. A thermal recovery wellhead device with good airtightness according to claim 1, characterized in that: The opening and closing assembly comprises an electric push rod (16) fixedly mounted on the upper end of the sealing cylinder cover (10), a connecting plate (21) fixedly mounted on the telescopic end of the electric push rod (16), a closing plate (17) fixedly mounted on the lower end of the connecting plate (21), and the other end of the closing plate (17) extending into the pressure relief exhaust port (15).

8. A thermal recovery wellhead device with good air tightness according to claim 7, characterized in that: An opening for sliding the closing plate (17) is provided on the outer side of the pressure relief vent (15), and an arc groove matching the side of the closing plate (17) is provided on the inner side of the pressure relief vent (15), thereby further improving the stability of the closing plate (17).

9. A thermal recovery wellhead device with good air tightness according to claim 7, characterized in that: A guide slide rail (18) is provided at the upper end of the sealing cylinder cover (10), and a guide slide block (22) is fixedly mounted at the lower end of the closing plate (17), wherein the guide slide block (22) is located inside the guide slide rail (18) and slides.

10. A thermal recovery wellhead device with good air tightness according to claim 1, characterized in that: The sealing assembly comprises a slide groove (26) provided at the lower end of the mounting flange (2), a slide plate (27) being slidably connected to the inner side of the slide groove (26), the slide plate (27) being elastically connected to the slide groove (26) via a plurality of return springs (30), a sealing installation groove (24) being provided at the lower end of the mounting flange (2), a sealing airbag (23) being fixedly installed inside the sealing installation groove (24), the slide groove (26) and the sealing airbag (23) being connected via a connecting pipe (28); a limiting plate (29) being fixedly installed on the outer side of the slide plate (27), a limiting groove (25) being compatible with the limiting plate (29) being provided on the inner side of the slide groove (26), the limiting plate (29) being located in the limiting groove (25) and sliding.

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