Wellhead channeling gas trapping treatment device and method

Abstract

The invention belongs to the technical field of petroleum and natural gas exploration and development, and particularly relates to a wellhead channeling gas trapping treatment device and method, and the treatment device comprises a trap, a desulfurizer and a connecting pipeline. The trap comprises two shell assemblies which are mutually symmetrical and independently arranged. The shell assembly comprises a semicircular sector ring plate, and a first semicircular ring column and a second semicircular ring column are integrally formed on the two sides of the semicircular sector ring plate based on the inner diameter and the outer diameter correspondingly. A plurality of splicing fastening assemblies are arranged between the two shell assemblies along the symmetrical edges. The catcher is provided with a gas catching joint communicated with the inner space and the outer space, and the catcher is communicated and connected with the desulfurizer through the gas catching joint by the connecting pipeline. According to the technical scheme, the structure is simple, installation is convenient, use is safe and reliable, and compared with existing technical measures of supplementing and running a casing pipe, squeezing and injecting a blocking agent inside and the like, the channeling gas treatment cost can be reduced by 90% or above through the technology.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas exploration and development technology, and particularly relates to a wellhead channel gas capture and treatment device and method. Background Technology

[0002] After well completion or during production, natural gas can leak from the formation to the surface via the outer annulus of the surface casing due to factors such as cementing quality defects, crustal movement, or temperature and pressure changes during production. This is known as "channeling gas" in the oil and gas production field. According to field surveys, most older gas production wellheads are more prone to natural gas leakage, estimated to account for more than 5% of such wellheads. Channeling gas leakage is generally small and difficult to capture. It is not easily detected until rainwater or liquid floods the wellhead, and the amount of leakage cannot be accurately measured.

[0003] Since natural gas is a combustible gas and some natural gas also contains toxic gases such as hydrogen sulfide, the presence of cross-venting gas poses a significant safety hazard to the production site. At the same time, because the amount of natural gas leakage cannot be accurately measured, it is impossible for managers to control when the risk of cross-venting gas in gas wells increases.

[0004] Among existing technical measures, two common methods are casing replacement and plugging agent injection to address the safety risks caused by gas channeling. Casing replacement involves installing a smaller-diameter casing inside the existing oil layer casing, then cementing the annulus between the new casing and the oil layer casing to seal the leakage path from the oil layer casing. This method is only suitable for gas wells with cementing quality issues or damaged outer casing, and the construction cost is typically several million yuan, with a low success rate. The plugging agent injection method involves temporarily installing a packer inside the gas wellbore to isolate the upper wellbore from the lower formation, then injecting a high-pressure plugging agent with delayed curing or high viscosity into the wellbore. After removing the packer, gas well production is restored. This method is typically only suitable for gas wells with casing damage or cement sheath failure in the upper part of the wellbore, and the construction cost is also as high as several million yuan.

[0005] As can be seen from the above, the existing technology has certain practicality for some gas wells with identifiable causes and locations of caving. However, since many caving gas leakage sites are located outside the surface casing and the leakage volume is extremely low (generally less than 1.0 m³ / d), the above methods are not only extremely expensive, but also cannot guarantee effectiveness. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of the existing technology by proposing a wellhead gas leakage collection and treatment device and method. The device features collection, leakage rate calculation, purification, and safe discharge capabilities. Combined with specific methods for its field application, it economically, safely, and efficiently solves the safety hazards caused by wellhead gas leakage.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A wellhead gas trapping and treatment device includes a trap, a desulfurizer, and connecting pipelines. The trap comprises two symmetrically arranged and independently configured shell assemblies; each shell assembly includes a semi-circular fan-shaped ring plate, with a first semi-circular annular column integrally formed above the semi-circular fan-shaped ring plate based on its inner diameter, and a second semi-circular annular column integrally formed below the semi-circular fan-shaped ring plate based on its outer diameter; several splicing and fastening components are arranged between the two shell assemblies along their symmetrical edges. The trap is equipped with a gas trapping connector connecting the internal and external spaces, and the connecting pipeline connects the trap and the desulfurizer through the gas trapping connector.

[0008] Preferably, the splicing fastening assembly includes a connecting lug, a bolt, and a nut; the bolt passes through the connecting lug and engages with the nut to allow the two housing assemblies to be detachably and securely connected.

[0009] Preferably, the outer contact surface of the housing assembly is provided with grease injection sealing grooves, and the outer surface of the housing assembly is provided with a grease injection interface communicating with the grease injection sealing grooves.

[0010] Preferably, the desulfurizer includes a cylinder; the inside of the cylinder is provided with a porous baffle, the upper part of the porous baffle is filled with desulfurizing agent, and the lower part of the porous baffle is a gas-liquid chamber; the connecting pipe is connected to the gas-liquid chamber; the bottom of the cylinder is connected to a drain pipe, and the top of the cylinder is provided with a sealing cylinder cover, on which a detection pipe and an exhaust pipe are respectively connected.

[0011] Preferably, a support frame is provided at the bottom of the cylinder.

[0012] A method for capturing and treating wellhead cross-flow gas, employing the aforementioned wellhead cross-flow gas capture and treatment device, includes the following steps: S1. Determine the size of the trap based on the structure of the wellhead device; S2, install the trap in the wellhead equipment's gas leakage area; S3, install the desulfurizer on the ground at the wellhead where the wellhead device is located, and connect the collector to the desulfurizer through the connecting pipeline; S4, through the connecting pipeline, introduces the gas in the trap into the desulfurizer for treatment before being discharged.

[0013] Preferably, in step S1, determining the size of the trap includes the following steps: S11, Remove the original covering layer inside the well where the wellhead device is located, and expose the head of the outer casing unit of the bottom flange below the wellhead device; S12, determine the gas leakage area by measuring the distance from the maximum leakage point to the center of the wellhead assembly to determine the size of the second semi-circular annulus in the shell assembly; S13, Measure the outer diameter of the technical sleeve in the sleeve unit to determine the size of the first semi-circular annulus in the housing assembly; S14. The size of the semicircular fan-shaped plate is determined by the radius difference between the second semicircular ring and the first semicircular ring.

[0014] Preferably, in step S2, installing the trap in the gas leakage area of ​​the wellhead device includes the following steps: S21, Lay a layer of permeable sand in the gas leakage area; S22, clamp the two housing components of the trap to the technical casing of the wellhead device on the left and right sides respectively, and fix the two housing components to each other by splicing fastening components; S23, after sealing the trap and burying the connecting pipes, lay an impermeable layer on the surface of the trap; S24. Lay a concrete protective layer on the surface of the impermeable layer to complete the installation of the trap.

[0015] Preferably, in step S23, the housing assembly of the trap is provided with a grease injection sealing groove and a grease injection interface. The trap is sealed by injecting sealing material into the grease injection sealing groove through the grease injection interface, so that a seal is formed between the two housing assemblies and between the housing assembly and the technical sleeve.

[0016] Preferably, in step S4, before the gas is emitted, the desulfurization effect of the gas to be emitted is also detected.

[0017] The beneficial effects of this invention are: 1) The device and method for capturing and treating wellhead channel gas proposed in this technical solution can capture and desulfurize wellhead channel gas that leaks under normal pressure or slightly positive pressure, and introduce it into the field venting system for safe discharge as needed, thereby solving the safety risks caused by wellhead channel gas.

[0018] 2) This technical solution addresses the problem that the leakage of gas from wellhead channels is generally very small and difficult to observe and measure. By installing a detection pipeline on the desulfurizer, the changes in the leakage of gas from channels can be monitored at any time. When the leakage risk increases, measures such as wellhead depressurization can be taken in a timely manner to reduce safety risks.

[0019] 3) The wellhead channeling gas capture and treatment device disclosed in this technical solution has a simple structure, is easy to install, and is safe and reliable to use. Compared with the existing technical measures such as adding casing and internal injection of sealing agent, the cost of channeling gas treatment can be reduced by more than 90% by adopting this technology. Attached Figure Description

[0020] Figure 1 A schematic diagram of the installation structure of the wellhead gas trapping and treatment device; Figure 2 A schematic diagram illustrating the application scenario of a wellhead gas trapping and treatment device. Figure 3 This is a schematic diagram of the overall structure of the trap; Figure 4 This is a schematic diagram of the housing assembly. Figure 5 This is a schematic diagram of the desulfurizer.

[0021] In the picture: 1. Gas trap; 1.1 Semicircular fan-shaped ring plate; 1.2 First semicircular ring column; 1.3 Second semicircular ring column; 1.4 Splicing and fastening assembly; 1.41 Connecting lugs; 1.42 Bolts; 1.43 Nuts; 1.5 Gas trap connector; 1.6 Grease injection sealing groove; 1.7 Grease injection interface; 2. Desulfurizer; 2.1 Cylinder; 2.2 Porous baffle; 2.3 Desulfurizing agent; 2.4 Gas-liquid chamber; 2.5 2.6 Drainage pipe; 2.7 Sealing cylinder cover; 2.8 Inspection pipe; 2.9 Vent pipe; 3. Valve switch; 4. Check valve; 5. Connecting pipe; 6. Support frame; 7. Wellhead equipment; 7.1 Bottom flange; 7.2 Oil layer casing; 7.3 Technical casing; 7.4 Surface casing; 7.5 Cement sheath; 8. Settled square well; 9. Original overburden layer; 10. Sand layer; 11. Impermeable layer; 12. Concrete protective layer. Detailed Implementation

[0022] To make the purpose, technical solution and advantages of the invention clearer, the technical solution of the invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the invention, but not all embodiments.

[0023] Therefore, the following detailed description of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0024] Example 1 This embodiment discloses a wellhead channel gas capture and treatment device and method (hereinafter referred to as "treatment device" and "treatment method"). As a preferred embodiment of the present invention, the treatment device is set according to the structure of the wellhead device 7, and the treatment method is implemented based on the treatment device. Figure 2 As shown, the wellhead assembly 7 includes a bottom flange 7.1, below which a well casing unit is installed. Specifically, the well casing unit, from the inside out, consists of an oil layer casing 7.2, a technical casing 7.3, and a surface casing 7.4, with a cement sheath 7.5 between adjacent casings. After the wellhead assembly 7 is installed, a backfill layer (i.e., the original cover layer 9) is laid in the sinking well 8 where it is located. Common wellhead gas seepage typically occurs along the cement sheath 7.5. Therefore, as... Figure 1 As shown, the treatment device includes a collector 1, a desulfurizer 2, and a connecting pipeline 5.

[0025] For ease of installation, such as Figure 3 As shown, the collector 1 includes two symmetrically arranged and independently configured shell assemblies. Each shell assembly includes a semi-circular fan-shaped ring plate 1.1. Above the semi-circular fan-shaped ring plate 1.1, a first semi-circular ring column 1.2 is integrally formed based on the inner diameter, and below the semi-circular fan-shaped ring plate 1.1, a second semi-circular ring column 1.3 is integrally formed based on the outer diameter. Between the two shell assemblies, several splicing and fastening components 1.4 are arranged along the symmetrical edge. Based on this, the collector 1 is provided with a gas-catching connector 1.5 that connects the inner and outer spaces. The connecting pipe 5 connects the collector 1 to the desulfurizer 2 through the gas-catching connector 1.5.

[0026] Based on the above structure, the desulfurizer 2 is installed near the wellhead square well, and sufficient desulfurizing agent 2.3 is filled into the desulfurizer 2. The outlet pipeline of the desulfurizer 2 is connected to the venting system pipeline of the station. In this way, the gas stored in the trap 1 can enter the desulfurizer 2 through the connecting pipeline 5, and after desulfurization, it can be safely discharged into the venting system of the station.

[0027] Based on the above-described processing device structure and its working principle, the corresponding processing method includes the following steps: S1, Determine the size of the trap 1 according to the structure of the wellhead device 7; S2, install the trap 1 in the gas leakage area of ​​the wellhead device 7; S3, install the desulfurizer 2 on the ground at the wellhead where the wellhead device 7 is located, and connect the collector 1 to the desulfurizer 2 through the connecting pipe 5; S4, the gas in the trap 1 is introduced into the desulfurizer 2 for treatment and then discharged through the connecting pipe 5.

[0028] Example 2 This embodiment discloses a wellhead channel gas capture and treatment device and method (hereinafter referred to as "treatment device" and "treatment method"). As a preferred embodiment of the present invention, based on Embodiment 1, the splicing and fastening assembly 1.4 in the treatment device includes a connecting lug 1.41, a bolt 1.42, and a nut 1.43. The bolt 1.42 passes through the connecting lug 1.41 and engages with the nut 1.43, allowing the two housing assemblies to be detachably and securely connected. This splicing and fastening assembly 1.4 structure is easy to manufacture, has a large operability, and plays a significant role in ensuring the firmness of the splicing of the two housing assemblies. In addition, considering the reliability of the connection, the number of splicing and fastening assemblies 1.4 can be flexibly set according to the size of the housing assemblies, and it has the characteristic of being universally applicable to multiple sizes.

[0029] Example 3 This embodiment discloses a wellhead channeling gas trapping and treatment device and method (hereinafter referred to as "treatment device" and "treatment method"). As a preferred embodiment of the present invention, based on embodiment 1 or 2, the trap 1 in the treatment device is provided with a sealing structure. The commonly used sealing structure is an elastic seal. This technical solution considers the adaptability and anti-aging properties of the seal. Preferably, the outer contact surface of the shell assembly is provided with grease injection sealing grooves 1.6, and the outer surface of the shell assembly is provided with grease injection interfaces 1.7 communicating with the grease injection sealing grooves 1.6. Herein, the so-called "outer contact surface" specifically refers to the surface that is in sealing contact with other structures besides its own structure, such as Figure 4 As shown, the splicing surfaces of the two housing components need to contact and seal each other, which are "external contact surfaces". The inner wall of the first semi-circular annular column 1.2 of the housing component needs to contact and seal with the technical sleeve 7.3 of the sleeve unit, which are also "external contact surfaces".

[0030] Based on the above structure, after the catcher 1 is installed, sealing material is injected into the grease sealing groove 1.6 through the grease injection interface 1.7, which can achieve a reliable seal between the two housing components and between the catcher 1 and the wellhead device 7, effectively preventing gas leakage.

[0031] Example 4 This embodiment discloses a wellhead channeling gas capture and treatment device and method (hereinafter referred to as "treatment device" and "treatment method"). As a preferred embodiment of the present invention, based on embodiment 1, 2 or 3, such as... Figure 5As shown, the desulfurizer 2 in its processing device includes a cylinder 2.1; the interior of the cylinder 2.1 is provided with a porous baffle 2.2, the upper part of the porous baffle 2.2 is filled with desulfurizing agent 2.3, and the lower part of the porous baffle 2.2 is a gas-liquid chamber 2.4, which is connected to the gas-liquid chamber 2.4 by a connecting pipe 5. Furthermore, the bottom of the cylinder 2.1 is connected to a drain pipe 2.5, and the top of the cylinder 2.1 is provided with a sealing cover 2.6, which is connected to a detection pipe 2.7 and an exhaust pipe 2.8 respectively.

[0032] Furthermore, for ease of installation, a support frame 6 is provided at the bottom of the cylinder 2.1.

[0033] Based on the above structure, under normal circumstances, valve switch 3 on the drain pipe 2.5 is in the closed state. After the gas (mixed with some water vapor) captured by the collector 1 is introduced into the gas-liquid chamber 2.4 through the connecting pipe 5, the gas, under the influence of density, passes through the small holes on the porous partition 2.2 and seeps into the desulfurizing agent 2.3. After being desulfurized by the desulfurizing agent 2.3, it reaches the top of the cylinder 2.1. At this time, valve switch 3 in the exhaust pipe 2.8 can be closed, and valve switch 3 in the detection pipe 2.7 can be opened. Gas samples are taken through the detection pipe 2.7 to test whether the gas quality after desulfurization meets the standards. If the test is qualified, valve switch 3 on the exhaust pipe 2.8 can be opened to exhaust the gas.

[0034] Furthermore, when it is necessary to test the desulfurization effect, sampling and testing can be carried out through the detection pipeline 2.7. The liquid water or condensate contained in the cross-flow gas can be discharged through the drain pipe 2.5 at the bottom of the desulfurizer 2, thus preventing the desulfurizing agent 2.3 from becoming ineffective due to water immersion. Since the cross-flow gas leakage is generally extremely small, there are currently no other reliable measurement methods. In this technical solution, when it is necessary to measure the cross-flow gas leakage, a plastic bag with all the air removed can be placed over the outlet of the detection pipeline 2.7, the valve switch 3 of the exhaust pipeline 2.8 can be closed, the valve switch 3 of the detection pipeline 2.7 can be opened, and the amount of cross-flow gas flowing into the plastic bag over a period of time can be measured. The leakage amount of cross-flow gas per unit time can be obtained. Specifically, a syringe with a volume scale can be used to draw the amount of cross-flow gas in the plastic bag per unit time, and the leakage amount of cross-flow gas can be calculated.

[0035] Furthermore, the exhaust pipe 2.8 can be connected to the station's venting system to achieve unified gas discharge. Therefore, a check valve 4 is connected to the exhaust pipe 2.8 to prevent gas from backflowing into the desulfurizer 2 when other systems in the station are venting.

[0036] Example 5 This embodiment discloses a wellhead channel gas capture and treatment device and method (hereinafter referred to as "treatment device" and "treatment method"). As a preferred embodiment of the present invention, based on the treatment device of embodiment 1, 2, 3 or 4, the treatment method includes the following steps: S1, determine the size of the trap 1 based on the structure of the wellhead device 7, specifically: S11, remove the original covering layer 9 in the well where the wellhead device 7 is located, and expose the head of the casing unit below the bottom flange 7.1 of the wellhead device 7; S12, determine the gas leakage area by measuring the distance from the maximum leakage point to the center of the wellhead device 7, and determine the size of the second semi-circular annulus 1.3 in the shell assembly to ensure that the trap 1 can completely cover the gas leakage area. S13, Measure the outer diameter of the technical casing 7.3 below the bottom flange 7.1 of the wellhead assembly 7 to determine the size of the first semi-circular annulus 1.2 in the shell assembly; more specifically, the inner diameter of the first semi-circular annulus 1.2 is slightly larger than the outer diameter of the riser short of the oil layer casing 7.2 or the technical casing 7.3; S14. The size of the semicircular fan-shaped plate 1.1 is determined by the radius difference between the second semicircular ring post 1.3 and the first semicircular ring post 1.2.

[0037] S2, install the trap 1 in the gas leakage area of ​​the wellhead device 7, specifically: S21, a permeable sand layer 10 is laid in the gas leakage area of ​​the channel; S22, clamp the two housing components of the trap 1 to the technical casing 7.3 of the wellhead device 7 on the left and right sides respectively, and fix the two housing components relative to each other by splicing fastening component 1.4; S23, after sealing the trap 1 and burying the connecting pipe 5, a seepage-proof layer 11 is laid on the surface of the trap 1. The seepage-proof layer 11 completely covers the sand layer 10 and forms a seal with the outer surface of the trap 1. The shell assembly of the trap 1 is provided with a grease injection sealing groove 1.6 and a grease injection port 1.7. The trap 1 is sealed by injecting sealing material into the grease injection sealing groove 1.6 through the grease injection port 1.7, so that a seal is formed between the two shell assemblies and between the shell assembly and the technical sleeve 7.3.

[0038] S24, a concrete protective layer 12 is laid on the surface of the impermeable layer 11, thus completing the installation of the trap 1. In this way, the gas entering the channel under normal pressure enters from the second semi-circular ring and is captured by the trap 1.

[0039] S3, install the desulfurizer 2 on the ground at the wellhead where the wellhead device 7 is located, and connect the collector 1 to the desulfurizer 2 through the connecting pipe 5; S4, the gas in the trap 1 is introduced into the desulfurizer 2 for treatment through the connecting pipe 5 before being discharged. Furthermore, before the gas is discharged, the desulfurization effect of the gas to be discharged is tested.

[0040] Example 6 This embodiment discloses a wellhead gas trapping and treatment device and method (hereinafter referred to as "treatment device" and "treatment method"). As a preferred embodiment of the present invention, based on embodiments 1, 2, 3, 4 or 5, for wellhead square wells and wells with loose soil layers around the wellhead and gas leakage, an explosion-proof suction pump can be added between the trap 1 and the desulfurizer 2 to actively suction and prevent the gas from overflowing the area covered by the trap 1 or escaping from the lower part of the sand layer 10.

[0041] Example 7 This embodiment discloses a wellhead channel gas capture and treatment device and method (hereinafter referred to as "treatment device" and "treatment method"). As a preferred embodiment of the present invention, based on embodiments 1, 2, 3, 4 or 5, for wells with large channel gas leakage areas, when the processable trap 1 cannot cover the leakage area, the excavation can continue downward along the bottom of the square wellhead until the found diffusion area is smaller than the processable trap 1 (the channel gas at the wellhead all seeps upward along the cement sheath 7.5, and the leakage area becomes smaller as the excavation goes down). The radius and length of the large diameter end of the trap 1 are then processed according to the excavation depth and the radius of the leakage area.

Claims

1. A wellhead channel gas capture treatment apparatus, characterized by: Includes a trap (1), a desulfurizer (2), and connecting pipes (5); The trap (1) includes two symmetrical and independently arranged shell assemblies; the shell assembly includes a semi-circular fan ring plate (1.1), a first semi-circular ring column (1.2) integrally formed above the semi-circular fan ring plate (1.1) based on its inner diameter, and a second semi-circular ring column (1.3) integrally formed below the semi-circular fan ring plate (1.1) based on its outer diameter; between the two shell assemblies, a number of splicing fastening components (1.4) are arranged along the symmetrical edge. The trap (1) is equipped with a gas trap connector (1.5) that connects the inner and outer spaces. The connecting pipe (5) connects the trap (1) and the desulfurizer (2) through the gas trap connector (1.5).

2. A wellhead channel gas capture treatment apparatus as claimed in claim 1 wherein: The splicing fastening assembly (1.4) includes a connecting lug (1.41), a bolt (1.42), and a nut (1.43); after the bolt (1.42) passes through the connecting lug (1.41), it cooperates with the nut (1.43) to make the two housing assemblies detachably and fastened together.

3. A wellhead channel gas capture treatment apparatus as defined in claim 1, wherein: The outer contact surface of the housing assembly is provided with grease injection sealing grooves (1.6), and the outer surface of the housing assembly is provided with grease injection ports (1.7) that communicate with the grease injection sealing grooves (1.6).

4. A wellhead channel gas capture treatment apparatus as defined in claim 1, wherein: The desulfurizer (2) includes a cylinder (2.1); the inside of the cylinder (2.1) is provided with a porous baffle (2.2), the top of the porous baffle (2.2) is filled with desulfurizing agent (2.3), and the bottom of the porous baffle (2.2) is a gas-liquid chamber (2.4); the connecting pipe (5) is connected to the gas-liquid chamber (2.4); the bottom of the cylinder (2.1) is connected to a drain pipe (2.5), and the top of the cylinder (2.1) is provided with a sealing cylinder cover (2.6), and the sealing cylinder cover (2.6) is connected to a detection pipe (2.7) and an exhaust pipe (2.8).

5. A wellhead channel gas capture treatment apparatus as defined in claim 4, wherein: The bottom of the cylinder (2.1) is provided with a support frame (6).

6. A wellhead channel gas capture treatment method characterized by, The wellhead channeling gas capture and treatment device as described in any one of claims 1-5 includes the following steps: S1, determine the size of the trap (1) according to the structure of the wellhead device (7); S2, install the trap (1) in the gas leakage area of ​​the wellhead device (7); S3, install the desulfurizer (2) on the ground at the wellhead where the wellhead device (7) is located, and connect the collector (1) to the desulfurizer (2) through the connecting pipe (5); S4, the gas in the trap (1) is introduced into the desulfurizer (2) through the connecting pipe (5) for treatment and then discharged.

7. The wellhead channeling gas capture and treatment method as described in claim 6, characterized in that: In step S1, determining the size of the trap (1) includes the following steps: S11, remove the original covering layer (9) in the well where the wellhead device (7) is located, and expose the head of the casing unit below the bottom flange (7.1) of the wellhead device (7); S12, determine the gas leakage area in the channel, and determine the size of the second semi-circular annulus (1.3) in the shell assembly by measuring the distance of the maximum leakage point from the center of the wellhead device (7); S13, Measure the outer diameter of the technical casing (7.3) below the bottom flange (7.1) of the wellhead assembly (7) to determine the dimensions of the first semi-circular annulus (1.2) in the shell assembly; S14. The size of the semicircular fan ring plate (1.1) is determined by the radius difference between the second semicircular ring post (1.3) and the first semicircular ring post (1.2).

8. The wellhead channeling gas capture and treatment method as described in claim 6, characterized in that: In step S2, installing the trap (1) in the gas leakage area of ​​the wellhead device (7) includes the following steps: S21, a permeable sand layer (10) is laid in the gas leakage area of ​​the channel. S22, clamp the two housing components of the trap (1) to the technical casing (7.3) of the wellhead device (7) on the left and right sides respectively, and fix the two housing components relative to each other by splicing fastening components (1.4); S23, after sealing the trap (1) and burying the connecting pipe (5), lay an impermeable layer (11) on the surface of the trap (1). S24, a concrete protective layer (12) is laid on the surface of the impermeable layer (11), thus completing the installation of the trap (1).

9. The wellhead channeling gas capture and treatment method as described in claim 8, characterized in that: In step S23, the housing assembly of the trap (1) is provided with a grease sealing groove (1.6) and a grease injection port (1.7). The trap (1) is sealed by injecting sealing material into the grease sealing groove (1.6) through the grease injection port (1.7), so that a seal is formed between the two housing assemblies and between the housing assembly and the technical sleeve (7.3).

10. The wellhead channeling gas capture and treatment method as described in claim 6, characterized in that: In step S4, before the gas is emitted, the desulfurization effect of the gas to be emitted is also tested.

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