An antifreeze device for gas wellhead pipelines

Abstract

This utility model provides an antifreeze device for gas wellhead pipelines, comprising: a protective shell, having an annular structure with an opening on one side; a heat insulation pad layer, located between the inner annular surface of the protective shell and the pipeline; a clamping member, used to radially press and limit the heat insulation pad layer on the inner annular surface of the protective shell, the clamping member being configured to have an adjustable and limitable radial distance from the inner annular surface of the protective shell, so as to realize radial pressing or releasing of the heat insulation pad layer by the clamping member; and a closing fastening assembly, used to connect the two ends of the protective shell to tighten the opening of the protective shell, thereby allowing the protective shell to clamp the heat insulation pad layer onto the pipeline. In this utility model, the protective shell can protect the heat insulation pad layer from exposure, thereby slowing down the aging rate of the heat insulation pad layer; the clamping member radially presses and limits the heat insulation pad layer on the inner annular surface of the protective shell, which is beneficial for limiting the heat insulation pad layer and preventing the heat insulation pad layer from shifting relative to the protective shell after aging and thinning.

Description

Technical Field

[0001] This utility model relates to the field of antifreeze technology for gas wellhead pipelines, and particularly to an antifreeze device for gas wellhead pipelines. Background Technology

[0002] In the later stages of gas field development, condensate water is produced at the wellhead as wellhead pressure decreases and ambient temperature changes. This condensate water accumulates and forms hydrates, which can freeze and block the wellhead during the cold winter months, severely impacting peak winter gas supply. Therefore, it is necessary to take preventative measures: wrapping the wellhead with insulating material to reduce heat transfer between the external and internal wellhead temperatures, thus preventing ice blockage at the wellhead in winter.

[0003] However, since the gas well is located in an open environment, if the insulation layer covering the wellhead is not protected, the insulation layer will be directly exposed to the outside, which may cause the insulation layer to age due to wind, rain or sun exposure. This will lead to a decrease in the insulation effect of the insulation layer on the gas well and increase the probability of water compounds inside the gas well freezing. Utility Model Content

[0004] This utility model provides an antifreeze device for gas wellhead pipelines, which is used to insulate the gas wellhead pipelines. On this basis, the insulation pad is protected and limited to prevent it from being exposed or displaced after long-term use.

[0005] This utility model provides an antifreeze device for gas wellhead pipelines, which includes: The protective shell has a ring-shaped structure with an opening on one side; A heat insulation pad is located between the inner annular surface of the protective shell and the pipe; A clamping member is used to radially press and limit the heat insulation pad layer on the inner annular surface of the protective shell. The clamping member is configured to have an adjustable and limitable radial distance from the inner annular surface of the protective shell, so as to enable the clamping member to radially press or release the heat insulation pad layer. A closing fastening assembly is used to connect the two ends of the protective shell to tighten the opening of the protective shell, thereby allowing the protective shell to clamp the heat insulation pad onto the pipe.

[0006] In one embodiment, the clamping member is a pressure rod extending axially along the protective shell; it also includes: A position adjustment component is disposed on the protective shell and connected to the pressure rod. The position adjustment component is configured to drive the pressure rod to move to adjust the radial distance between the pressure rod and the inner annular surface of the protective shell, and to limit the position of the pressure rod. The pressure rod always extends along the axial direction of the protective shell during the displacement process.

[0007] In one embodiment, the position adjustment component includes: A rotating shaft is parallel to and fixedly connected to the pressure rod. The rotating shaft is rotatably disposed inside the protective shell around its own axis. The rotating shaft can adjust the radial position of the pressure rod on the protective shell by driving the pressure rod to rotate. The fastening and limiting component has a screwing part at one end and the other end is coaxially and fixedly connected to the rotating shaft after passing through the protective shell, thus fastening and limiting the rotating shaft on the protective shell.

[0008] As one implementation, an anti-slip structure is provided on the mating surface between the pressure rod and the heat insulation pad.

[0009] In one embodiment, the anti-slip structure includes a ridge formed on the pressure bar and extending along the axial direction of the pressure bar; Several protruding ribs are arranged at intervals along the circumference of the pressure bar.

[0010] In one embodiment, the protective shell includes an annular body and annular end caps disposed at two axial ends of the annular body; The annular end cap and the annular body together define a receiving cavity, and the heat insulation pad is disposed in the receiving cavity.

[0011] In one embodiment, an annular seal is provided between the radial inner wall of the annular end cap and the pipe.

[0012] As one embodiment, a water-blocking strip extending circumferentially from one end of the protective shell located at the top is provided. The water-blocking strip has an inclined flow-guiding surface, and the inclined flow-guiding surface is inclined downward in the radial outward direction along the protective shell.

[0013] As one implementation, the closing fastening assembly includes: A limit rod is installed on the first end of the protective shell; The stud has its fixed end fixed to the second end of the protective shell, and its free end extends toward the limit rod. A limit plate and a stop nut are sequentially installed on the stud from the fixed end to the free end; the limit plate passes through the stud, and the side of the limit plate facing the fixed end is fitted and limited on the limit rod.

[0014] In one embodiment, a mounting base is formed on the outer wall of the protective shell for fixing the protective shell to an external component.

[0015] Compared with the prior art, the advantages of this utility model are: The protective shell protects the insulation pad from exposure, preventing it from being exposed to wind and sun, thus slowing down its aging process. The clamping element radially presses and limits the insulation pad against the inner ring surface of the protective layer, facilitating its reshaping and preventing displacement relative to the protective shell as the insulation pad thins with age.

[0016] Of course, users can also replace the insulation pad regularly to prevent it from aging and affecting the insulation effect. Attached Figure Description

[0017] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0018] Figure 1 This is a structural schematic diagram of an antifreeze device for gas wellhead pipelines; Figure 2 yes Figure 1 A schematic diagram of the antifreeze device for gas wellhead pipelines in China without the installation of a heat insulation pad. Figure 3 This is a schematic diagram of the installation of the position adjustment component and the pressure rod; Figure 4 This is a schematic diagram of the external structure of the antifreeze device used in the gas wellhead pipeline.

[0019] Figure label: 1. Thermal insulation layer; 11. Ribbons; 2. Protective shell; 21. Annular body; 22. Annular end cap; 23. Receiving cavity; 201. First mounting position; 202. Second mounting position; 3. Compression rod; 31. Protruding rib; 4. Position adjustment assembly; 41. Rotary shaft; 42. Fastening and limiting component; 421. Tightening part; 422. Slot; 43. Swing arm; 5. Closure fastening assembly; 51. Limiting rod; 52. Stud; 53. Limiting mating plate; 54. Stop nut; 6. Auxiliary tightening components; 7. Annular seal; 8. Water-blocking strip; 81. Angled guide surface; 9. Mounting bracket. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] This utility model embodiment provides an antifreeze device for gas wellhead pipelines, which includes a heat insulation pad 1, a protective shell 2, a clamping component, and a closing fastening assembly 5. Details are as follows: The protective shell 2 has an open annular structure on one side, which can be placed over the heat insulation pad 1 to protect it. The heat insulation pad 1 is sandwiched between the inner annular surface of the protective shell 2 and the pipe; the heat insulation pad 1 can block heat transfer between the pipe and the outside environment to insulate the pipe. The heat insulation pad 1 can be made of fiberglass, sponge, aerogel felt, or vacuum board, etc. Of course, the heat insulation pad 1 can also be made of other materials.

[0022] The clamping component is used to radially press and limit the heat insulation pad 1 on the inner annular surface of the protective shell 2. The clamping component is configured to have an adjustable and limitable radial distance from the inner annular surface of the protective shell 2, so as to realize the clamping component to radially press or release the heat insulation pad 1. The closing fastening assembly 5 is used to connect the two ends of the protective shell 2 to tighten the opening of the protective shell 2 and reduce the annular radius of the protective shell 2, so that the protective shell 2 clamps the heat insulation pad 1 on the pipe, so that the inner annular surface of the heat insulation pad 1 is tightly attached to the outer wall of the pipe.

[0023] In this embodiment, the installation process of the antifreeze device is basically as follows: First, the clamping member is moved radially inward along the protective shell 2 to increase the distance between the clamping member and the inner ring surface of the protective shell 2, and to make this distance greater than the thickness of the heat insulation pad 1; then, the heat insulation pad 1 is laid on the inner ring surface of the protective layer along the circumference of the protective shell 2; the clamping member is moved radially outward along the protective shell 2, and the clamping member radially presses and limits the heat insulation pad 1 on the inner ring surface of the protective layer, thereby achieving the fixation between the heat insulation pad 1 and the protective shell 2. Next, the protective shell 2 is wrapped around the pipeline at the gas wellhead, and the opening of the protective shell 2 is tightened using the inlet component, the inner diameter of the protective shell 2 shrinks and the heat insulation pad 1 fits against the pipeline at the gas wellhead, thereby tightening the protective shell 2 onto the pipeline.

[0024] The protective shell 2 protects the heat insulation pad 1 from exposure and prevents it from being exposed to wind and sun, thereby slowing down the aging rate of the heat insulation pad 1. The clamping component radially presses and limits the heat insulation pad 1 on the inner ring surface of the protective layer to limit the heat insulation pad 1, making it easier to shape the heat insulation pad 1 and preventing it from shifting relative to the protective shell 2 after the heat insulation pad 1 becomes thinner due to aging.

[0025] Of course, users can also replace the insulation pad 1 periodically to prevent it from aging and affecting the insulation effect. The replacement process of the insulation pad 1 is basically as follows: use the closing fastening component 5 to open the opening of the protective shell 2, remove the antifreeze device from the gas wellhead pipeline, and separate the insulation pad 1 from the pipeline; then, operate to move the clamping member radially inward along the protective shell 2 to release the insulation pad 1 to be replaced. After removing the insulation pad 1 to be replaced, a brand new insulation pad 1 can be installed.

[0026] A mounting base 9 is formed on the outer wall of the protective shell 2 for fixing the protective shell 2 to the external component. After the protective shell 2 is clamped onto the pipe, the user can use fastening bolts to fix the mounting base 9 to the external component, thereby reinforcing and limiting the installation position of the protective shell 2.

[0027] In this novel embodiment, the clamping member is a pressure rod 3 extending axially along the protective shell 2, and the axial length of the pressure rod 3 is adapted to the axial length of the heat insulation pad 1. A position adjustment assembly 4 connected to the pressure rod 3 is provided on the protective shell 2. The position adjustment assembly 4 is configured to move the pressure rod 3 to adjust the radial distance between the pressure rod 3 and the inner annular surface of the protective shell 2, and to limit the position of the pressure rod 3. Furthermore, the pressure rod 3 maintains its axial extension along the protective shell 2 throughout the displacement process.

[0028] To increase the friction between the heat insulation pad 1 and the pressure rod 3, an anti-slip structure is formed on the mating surface between the pressure rod 3 and the heat insulation pad 1.

[0029] In one embodiment, the anti-slip structure is a protrusion 31 formed on the pressure bar 3 and extending along the axial direction of the pressure bar 3; a plurality of protrusions 31 are arranged at intervals along the circumference of the pressure bar 3.

[0030] As another implementation, the anti-slip structure is a rib 11 formed on the inner ring surface of the heat insulation pad 1. The rib 11 is located near the pressure bar 3 and extends along the axial direction of the pressure bar 3. A number of ribs 11 are arranged at intervals along the circumference of the heat insulation pad 1.

[0031] In a preferred embodiment, a rib 31 is formed on the pressure rod 3, and a rib 11 is formed on the inner ring surface of the heat insulation pad 1. The anti-slip structure is defined by the rib 31 and the rib 11.

[0032] The position adjustment component 4 is described below.

[0033] In this embodiment, the pressure rods 3 are respectively disposed on both sides of the opening of the protective shell 2, and the position adjustment components 4 are respectively disposed in correspondence with the pressure rods 3. Each position adjustment component 4 includes a rotating shaft 41 and a fastening limiting member 42.

[0034] The rotating shaft 41 is parallel to and fixedly connected to the pressure rod 3. The rotating shaft 41 is rotatably mounted inside the protective shell 2 around its own axis. The rotating shaft 41 can drive the pressure rod 3 to rotate to adjust the radial position of the pressure rod 3 on the protective shell 2. One end of the fastening limiting member 42 located outside the protective shell 2 has a screwing part 421, and the other end passes through the protective shell 2 and is coaxially fixedly connected to the rotating shaft 41, thus fastening and limiting the rotating shaft 41 to the protective shell 2.

[0035] With this configuration, by operating the screwing part 421, the fastening limiting member 42 can be rotated a certain angle in the forward or reverse direction, causing the rotating shaft 41 to rotate and drive the pressure rod 3 to rotate around the rotating shaft 41, thereby enabling the clamping member to radially press or release the heat insulation pad 1. When the screwing part 421 is released, the fastening limiting member 42 can restrict the rotating shaft 41 to the protective shell 2.

[0036] Specifically, the protective shell 2 includes an annular body 21 and annular end caps 22 disposed at the two axial ends of the annular body 21; the annular end caps 22 and the annular body 21 together define a receiving cavity 23, and the heat insulation pad 1 is disposed in the receiving cavity 23.

[0037] The rotating shaft 41 extends axially along the protective shell 2, and its two ends are rotatably mounted on the annular end cap 22. The fastening limiting member 42 is a bolt or screw, and a slot 422 is provided on the screwing part 421 of the fastening limiting member 42. The cross-section of the slot 422 is not circular. When a tool matching its inner wall is inserted into the slot 422, the rotational torque can be transmitted to the fastening limiting member 42 and the rotating shaft 41 through the inner wall of the slot 422. The slot 422 can be a hexagonal groove.

[0038] The rotating shaft 41 and the pressure rod 3 are connected by two swing arms 43. Specifically, the two swing arms 43 are parallel to each other and spaced apart along the axial direction of the pressure rod 3, with one end of each swing arm 43 fixed to the rotating shaft 41 and the other end fixed to the pressure rod 3. In this way, during the rotation of the pressure rod 3 driven by the two swing arms 43, the rotating shaft 41 can ensure that the pressure rod 3 always extends along the axial direction of the protective shell 2.

[0039] To cope with rain, snow, and sandstorms, an annular seal 7 is provided between the radial inner wall of the annular end cap 22 and the pipe. The annular seal 7 can be made of flexible rubber. When the protective shell 2 is tightened onto the pipe, the annular seal 7 is clamped between the annular end cap 22 and the pipe, which can prevent external dust or rainwater from entering the receiving cavity 23 from between the annular end cap 22 and the pipe, thus strengthening the protection of the heat insulation pad 1 inside the receiving cavity 23.

[0040] Furthermore, a water-blocking strip 8 is provided on an annular end cap 22 located at the top, extending circumferentially along the protective shell 2; an inclined flow-guiding surface 81 is formed on the water-blocking strip 8, and the inclined flow-guiding surface 81 is inclined downward in the radial outward direction along the protective shell 2. When rainwater drips onto the water-blocking strip 8, it can flow downward along the inclined flow-guiding surface 81, preventing rainwater from accumulating on the protective shell 2 and seeping into the receiving cavity 23 from between the annular end cap 22 and the pipe.

[0041] The following is a description of the closing fastening component 5.

[0042] The fastening assembly 5 includes a limiting rod 51, a stud 52, a limiting mating plate 53, and a stop nut 54. Specifically, one end of the limiting rod 51 is fixed to the first end of the protective shell 2, and the other end extends radially outward; the fixed end of the stud 52 is fixed to the second end of the protective shell 2, and the free end of the stud 52 extends towards the limiting rod 51; the limiting mating plate 53 and the stop nut 54 are sequentially arranged on the stud 52 from the fixed end to the free end; the limiting mating plate 53 passes through the stud 52, and one side of the limiting mating plate 53 facing the fixed end is fitted and limited on the limiting rod 51.

[0043] In use, adjust the stop nut 54 close to the free end of the stud 52, and operate the limiting plate 53 against the limiting rod 51. Tighten the stop nut 54, and the limiting plate 53 will drive the limiting rod 51 closer to the fixed end under the push of the stop nut 54, so as to reduce the opening of the protective shell 2 and reduce the inner diameter of the protective shell 2, thereby tightening the heat insulation pad 1 on the pipe.

[0044] A first mounting position 201 is formed on the first end of the protective shell 2, and a second mounting position 202 is formed on the second end; the first mounting position 201 and the second mounting position 202 are respectively located on both sides of the opening of the protective shell 2. The limiting rod 51 is fixed on the first mounting position 201, and the stud 52 is fixed on the second mounting position 202.

[0045] Auxiliary tightening components 6 are also provided opposite to each other on the first mounting position 201 and the second mounting position 202. In use, the first end and the second end of the protective shell 2 are aligned, the auxiliary tightening components 6 on both sides of the operating opening are fitted together, and then the straps are used to tie and fix it; then, the closing fastening component 5 is used to tighten it.

[0046] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A freeze protection device for a gas gathering wellhead pipeline, characterized by, include: The protective shell has a ring-shaped structure with an opening on one side; A heat insulation pad is located between the inner annular surface of the protective shell and the pipe; A clamping member is used to radially press and limit the heat insulation pad layer on the inner annular surface of the protective shell. The clamping member is configured to have an adjustable and limitable radial distance from the inner annular surface of the protective shell, so as to enable the clamping member to radially press or release the heat insulation pad layer. A closing fastening assembly is used to connect the two ends of the protective shell to tighten the opening of the protective shell, thereby allowing the protective shell to clamp the heat insulation pad onto the pipe.

2. The freeze protection apparatus for gas wellhead piping according to claim 1, wherein The clamping element is a clamping rod extending axially along the protective shell; it also includes: A position adjustment component is disposed on the protective shell and connected to the pressure rod. The position adjustment component is configured to drive the pressure rod to move to adjust the radial distance between the pressure rod and the inner annular surface of the protective shell, and to limit the position of the pressure rod. The pressure rod always extends along the axial direction of the protective shell during the displacement process.

3. The freeze protection apparatus for gas wellhead piping of claim 2, wherein, The position adjustment component includes: A rotating shaft is parallel to and fixedly connected to the pressure rod. The rotating shaft is rotatably disposed inside the protective shell around its own axis. The rotating shaft can adjust the radial position of the pressure rod on the protective shell by driving the pressure rod to rotate. The fastening and limiting component has a screwing part at one end and the other end is coaxially and fixedly connected to the rotating shaft after passing through the protective shell, thus fastening and limiting the rotating shaft on the protective shell.

4. The anti-freezing device for a gas production wellhead pipe according to claim 2 or 3, characterized by An anti-slip structure is provided on the mating surface between the pressure rod and the heat insulation pad.

5. The antifreeze device for gas wellhead pipelines according to claim 4, characterized in that, The anti-slip structure includes a ridge formed on the pressure bar and extending along the axial direction of the pressure bar; Several protruding ribs are arranged at intervals along the circumference of the pressure bar.

6. The antifreeze device for gas wellhead pipelines according to any one of claims 1-3, characterized in that, The protective shell includes an annular body and annular end caps located at the two axial ends of the annular body. The annular end cap and the annular body together define a receiving cavity, and the heat insulation pad is disposed in the receiving cavity.

7. The antifreeze device for gas wellhead pipelines according to claim 6, characterized in that, An annular seal is provided between the radial inner wall of the annular end cap and the pipe.

8. The antifreeze device for gas wellhead pipelines according to claim 1, characterized in that, A water-blocking strip extending circumferentially from one end of the protective shell located at the top is provided on the protective shell. The water-blocking strip has an inclined flow-guiding surface, and the inclined flow-guiding surface is inclined downward in the radial outward direction along the protective shell.

9. The antifreeze device for gas wellhead pipelines according to any one of claims 1-3, characterized in that, The closing fastening assembly includes: A limit rod is installed on the first end of the protective shell; The stud has its fixed end fixed to the second end of the protective shell, and its free end extends toward the limit rod. A limit plate and a stop nut are sequentially installed on the stud from the fixed end to the free end; the limit plate passes through the stud, and the side of the limit plate facing the fixed end is fitted and limited on the limit rod.

10. The antifreeze device for gas wellhead pipelines according to any one of claims 1-3, characterized in that, A mounting base is formed on the outer wall of the protective shell for fixing the protective shell to external components.

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