A sulfur and carbon dioxide resistant gas injection and production wellhead device

Abstract

The present invention belongs to the technical field of gas wellhead devices, and specifically relates to a sulfur-resistant and carbon dioxide-resistant gas injection and production wellhead device, which includes an injection and production four-way assembly, a conversion flange assembly, and a sand removal assembly; the sand removal assembly includes a pipe body 1, a pipe body 2, a processing box, a sand removal cylinder, one end of the sand removal cylinder, an inner spiral blade, a spiral groove, a cylinder, and an inner spiral blade. When the pressure of natural gas decreases, the cylinder pushes the inner spiral blade downward through the bearing. The inner spiral blade rotates along the spiral groove during the downward push, and the path of natural gas through the inner spiral blade decreases. As the centrifugal force increases, it is conducive to throwing sand and gravel in the natural gas out of the sand removal cylinder; due to the decrease in natural gas pressure, a vortex-shaped gas column is formed on the axis of the sand removal cylinder and begins to diffuse. When the natural gas passes through the inner spiral blade, the inner spiral blade will guide the diffused gas column, causing it to gather toward the axis of the sand removal cylinder again, increasing the stability of the gas column and reducing the impact of the gas column on the sand and gravel.

Description

Technical Field

[0001] The invention belongs to the technical field of gas production wellhead devices, and in particular relates to a sulfur and carbon dioxide resistant gas injection and production wellhead device. Background Art

[0002] In the oil and natural gas extraction process, gas injection and production wellheads play a crucial role. Their primary function is to inject carbon dioxide (CO2) through the oil-bearing casing into the natural gas reservoir in the underground rock formation. This is based on the principle that CO2, with its greater density than downhole natural gas, can cause the natural gas to rise while simultaneously lowering the bottomhole temperature, reducing pipe column gas, and improving gas recovery. After injection, the bottomhole temperature drops, reducing pipe column gas, thereby increasing gas recovery rates and reducing pollutant emissions.

[0003] Due to the high wellhead pressures of CO2 flooding wells, most are self-flowing wells. Although the primary product is natural gas, it is often mixed with sand and gravel. This sand and gravel, which emanates from the high-speed natural gas jets to the wellhead, can severely impact the main valve. For example, patent publication number CN115199233A primarily removes sand using a sand baffle. However, due to the high natural gas pressure, the natural gas impacts the baffle during operation, causing vibration. Therefore, a cyclone desander is installed on the wellhead assembly to address this vibration issue. For example, patent publication number CN110479505A utilizes the medium's own kinetic energy to create a vortex within the spiral desander, separating the sand and gravel. When the spiral desander is operating, a vortex-shaped gas column forms at its central axis. This phenomenon is a normal phenomenon of fluid dynamics. When the natural gas pressure changes, such as decreasing, the shape of the gas column changes, potentially causing sand and gravel to splash, thereby compromising the desander's separation efficiency. Furthermore, decreasing natural gas pressure slows the gas flow rate, reducing the centrifugal force exerted on the sand particles within the cyclone. As a result, the sand particles cannot be effectively thrown to the wall and settled, thereby reducing the sand removal efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a mica tape wrapping machine for cable production with a simple structure and high efficiency in view of the shortcomings of the prior art, so as to solve the technical problems in the prior art.

[0005] The objectives of the present invention can be achieved by the following technical solutions: a sulfur and carbon dioxide resistant gas injection and production wellhead device, which includes an injection and production four-way assembly and a conversion flange assembly installed thereon, the conversion flange assembly is connected to a sand removal assembly, the sand removal assembly is connected to one interface of the four-way pipe through a manual gate valve, and the other interfaces of the four-way pipe are respectively installed with a threaded flange, a gas tree cap and an instrument flange, and an elbow is installed between the four-way pipe and the instrument flange;

[0006] The sand removal assembly includes a tube body one and a tube body two installed thereon, a processing box is installed at the bottom of the tube body two, a sand removal cylinder is fixedly installed inside the tube body one, one end of the sand removal cylinder is connected to the four-way pipe through the exhaust port, and the other end of the exhaust port is connected to the conversion flange assembly through the air inlet, an inner spiral piece is installed inside the sand removal cylinder, a spiral groove is provided inside the sand removal cylinder, the inner spiral piece and the spiral groove are arranged alternately, a cylinder is installed inside the tube body two, the cylinder is connected to the inscribed spiral blade through a bearing, an inclination angle is set inside the inscribed spiral blade, and the inscribed spiral blade slides in the spiral groove.

[0007] As a further optimization or improvement of this solution, the interior of the inscribed spiral blade is conically cut.

[0008] As a further optimization or improvement of this solution, a spiral propulsion piece is rotatably installed inside the tube body, and the spiral propulsion piece is located between the outer wall of the sand removal cylinder and the inner wall of the tube body. The inner and outer sides of the spiral propulsion piece are respectively sealed with the outer wall of the sand removal cylinder and the inner wall of the tube body, and a part of the spiral propulsion piece extends into the processing box.

[0009] As a further optimization or improvement of this solution, a gear ring is installed on the outer wall of the sand removing cylinder, a transmission box is installed on the outer side of the tube body, an electric motor is installed inside the transmission box, the output shaft of the motor is connected to the transmission gear, the transmission gear is engaged with the gear ring, and a spiral propulsion piece is installed at the bottom of the gear ring, and the spiral propulsion piece and the spiral groove are arranged alternately.

[0010] As a further optimization or improvement of this solution, the processing box is connected to the exhaust port through an exhaust pipe.

[0011] As a further optimization or improvement of this solution, an infusion port is installed at the bottom of the processing box, and water is injected into the processing box.

[0012] As a further optimization or improvement of this solution, sealing strips are respectively installed on the inner and outer sides of the spiral propulsion piece, and the sealing strips are respectively connected to the outer wall of the sand removal cylinder and the inner wall of the tube body.

[0013] Beneficial effects of the present invention:

[0014] (1) When the present invention is in use, the manual gate valve is opened, and the sand-carrying natural gas flows from the conversion flange assembly to the four-way pipe, passing through the desanding assembly. The natural gas enters the desanding assembly through the air inlet, and enters the desanding cylinder. The natural gas entering the desanding cylinder forms a vortex under the action of the inner spiral blade and generates an inertial force, which throws the sand and gravel in the natural gas out of the desanding cylinder through the inertial force. In the initial state, the blade at the bottom of the inner spiral blade is located in the spiral groove at the top of the desanding cylinder, so that the top of the desanding cylinder is a double spiral blade arrangement of the inner spiral blade and the inner spiral blade. At this time, when the natural gas passes through the top of the desanding cylinder, the path of the natural gas is reduced, and the inertial force of the natural gas when passing through the top of the desanding cylinder is increased, which is conducive to the throwing out of small particles of sand and gravel.

[0015] (2) When the pressure of natural gas decreases, the cylinder is started, and the cylinder pushes the inner spiral blade downward through the bearing. The inner spiral blade rotates along the spiral groove during the downward push. With the cooperation of the spiral groove and the inner spiral blade, the inner spiral blade is completely rotated into the spiral groove, so that the inner spiral blade overlaps with the desander. At this time, the two adjacent inner spiral blades are separated by the inner spiral blade. When the natural gas enters the desander, the path of the natural gas through the inner spiral blade is reduced, and its centrifugal force increases, which is conducive to throwing the sand and gravel in the natural gas out of the desander. Due to the decrease in natural gas pressure, a vortex-shaped gas column is formed on the axis of the desander and begins to diffuse. When the natural gas passes through the inner spiral blade, the inner spiral blade will guide the diffused gas column and make it gather toward the axis of the desander again, increasing the stability of the gas column and reducing the impact of the gas column on the sand and gravel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 Schematic diagram of the sand removal component structure.

[0019] Figure 3 Schematic diagram of the internal structure of the sand removal component.

[0020] Figure 4 This is an exploded view of the overall structure of the sand removal component.

[0021] Figure 5 It is a cross-sectional view of the sand removal cylinder structure.

[0022] Figure 6 Schematic diagram of the cross-section of the inscribed spiral blade structure.

[0023] Figure 7 The diagram shows the inscribed spiral blade and its matching.

[0024] Figure 8 Schematic diagram of the connection between the spiral propeller and the ring gear.

[0025] Figure 9 for Figure 8 A magnified view of the structure of part A.

[0026] The following are marked in the figure: 1. Injection and production four-way assembly; 2. Conversion flange assembly; 3. Manual gate valve; 4. Four-way pipe; 5. Threaded flange; 6. Gas production tree cap; 7. Elbow; 8. Instrument flange; 9. Sand removal assembly; 901. Pipe body one; 902. Pipe body two; 903. Processing box; 904. Sand removal cylinder; 905. Air inlet; 906. Exhaust port; 907. Exhaust pipe; 908. Motor; 909. Transmission box; 910. Cylinder; 911. Bearing; 912. Inscribed spiral blade; 913. Transmission gear; 914. Ring gear; 915. Spiral propulsion piece; 916. Spiral groove; 917. Infusion port; 918. Inner spiral piece; 919. Sealing strip. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] See also Figure 1-Figure 7 A sulfur and carbon dioxide resistant gas injection and production wellhead device, comprising an injection and production four-way assembly 1 and a conversion flange assembly 2 mounted thereon, the conversion flange assembly 2 being connected to a sand removal assembly 9, the sand removal assembly 9 being connected to one interface of a four-way pipe 4 via a manual gate valve 3, the other interfaces of the four-way pipe 4 being respectively mounted with a threaded flange 5, a gas tree cap 6, and an instrument flange 8, and an elbow 7 being installed between the four-way pipe 4 and the instrument flange 8;

[0029] The sand removal assembly 9 includes a tube body 901 and a tube body 2 902 installed thereon, a processing box 903 is installed at the bottom of the tube body 2 902, a sand removal cylinder 904 is fixedly installed inside the tube body 1 901, one end of the sand removal cylinder 904 is connected to the four-way pipe 4 through the exhaust port 906, and the other end of the exhaust port 906 is connected to the conversion flange assembly 2 through the air inlet 905, an inner spiral piece 918 is installed inside the sand removal cylinder 904, a spiral groove 916 is provided inside the sand removal cylinder 904, the inner spiral piece 918 and the spiral groove 916 are arranged alternately, a cylinder 910 is installed inside the tube body 2 902, the cylinder 910 is connected to the inscribed spiral blade 912 through a bearing 911, an inclination angle is set inside the inscribed spiral blade 912, and the inscribed spiral blade 912 slides in the spiral groove 916.

[0030] Specifically, the interior of the inscribed spiral blade 912 is conically cut.

[0031] It should be noted that a sand discharge groove is opened on the side wall of the sand removal cylinder 904. The sand discharge groove is similar to the spiral groove 916 and is opened in a spiral shape. The sand discharge groove is located at the connection part between the inner spiral piece 918 and the inner wall of the sand removal cylinder 904; when the natural gas pressure remains unchanged, the spiral groove 916 can serve as a sand discharge groove.

[0032] It should be noted that the present invention optimizes the dual main valve into a single main valve, namely the elbow 7 and the instrument flange 8, and the unit price is greatly reduced after optimization. The main pressure-bearing parts such as the injection and production four-way assembly 1, the four-way pipe 4, the elbow 7 and the like in the present invention are made of high-strength corrosion-resistant alloy materials, which can withstand high pressure in harsh corrosive environments such as high sulfur and carbon dioxide. A four-layer sealing structure is adopted between the internal suspension assembly of the conversion flange assembly 2 and the four-way pipe 4, including two stainless steel metal sealing rings, two high-performance rubber BT sealing rings and O-ring seals, which can effectively prevent the leakage of corrosive gases such as hydrogen sulfide and carbon dioxide. The overall inner and outer surfaces of the present invention are coated with a molybdenum disulfide anti-corrosion coating to enhance its resistance to low temperatures and corrosion.

[0033] When the present invention is in use, the manual gate valve 3 is opened, and the sand-carrying natural gas flows from the conversion flange assembly 2 to the four-way pipe 4, passing through the sand removal assembly 9. The natural gas enters the sand removal assembly 9 through the air inlet 905, and enters the sand removal cylinder 904. The natural gas entering the sand removal cylinder 904 forms a vortex under the action of the inner spiral blade 918 and generates an inertial force. The inertial force throws the sand and gravel in the natural gas out of the sand removal cylinder 904 and enters the processing box 903.

[0034] Specifically, the size of the blade at the bottom of the inscribed spiral blade 912 is the same as that of the inner spiral piece 918. In the initial state, the blade at the bottom of the inscribed spiral blade 912 is located in the spiral groove 916 at the top of the sand removal cylinder 904, so that the top of the sand removal cylinder 904 is a double spiral blade arrangement of the inner spiral piece 918 and the inscribed spiral blade 912 overlapping. At this time, when the natural gas passes through the top of the sand removal cylinder 904, the path of the natural gas is reduced, and accordingly, the inertial force of the natural gas when passing through the top of the sand removal cylinder 904 increases, which is conducive to the removal of small particles of sand and gravel.

[0035] When the natural gas pressure decreases, the flow rate of the gas also slows down, and the centrifugal force generated by the inner spiral blade 918 decreases. At the same time, the vortex-shaped gas column formed on the axis of the sand removal cylinder 904 is deformed under the action of the air pressure change, that is, the vortex-shaped gas column formed on the axis of the sand removal cylinder 904 begins to diffuse, and the sand removal efficiency decreases accordingly.

[0036] Therefore, the present invention starts the cylinder 910, and the cylinder 910 pushes the inscribed spiral blade 912 downward through the bearing 911. The inscribed spiral blade 912 rotates along the spiral groove 916 during the downward push. Under the cooperation of the spiral groove 916 and the inscribed spiral blade 912, the inscribed spiral blade 912 rotates into the spiral groove 916, so that the inscribed spiral blade 912 overlaps with the desander cylinder 904. At this time, the two adjacent inner spiral blades 918 are separated by the inscribed spiral blade 912. When the natural gas enters the desander cylinder 904, the path of the natural gas through the inner spiral blade 918 is reduced, and its centrifugal force increases, which is conducive to the sand and gravel in the natural gas being thrown out of the desander cylinder 904; due to the reduction in natural gas pressure, a vortex-shaped gas column is formed on the axis of the desander cylinder 904 and begins to diffuse. Figure 6 When the natural gas passes through the inscribed spiral blades 912, the inscribed spiral blades 912 will guide the diffused gas column and make it gather toward the axis of the sand removal cylinder 904 again, thereby increasing the stability of the gas column and reducing the impact of the gas column on the sand.

[0037] See also Figure 3-Figure 9 A spiral propulsion piece 915 is rotatably installed inside the tube body 901. The spiral propulsion piece 915 is located between the outer wall of the sand removal cylinder 904 and the inner wall of the tube body 901. The inner and outer sides of the spiral propulsion piece 915 are respectively sealed with the outer wall of the sand removal cylinder 904 and the inner wall of the tube body 901. A part of the spiral propulsion piece 915 extends into the processing box 903.

[0038] Specifically, a gear ring 914 is installed on the outer wall of the sand removal cylinder 904, a transmission box 909 is installed on the outside of the tube body 901, an electric motor 908 is installed inside the transmission box 909, the output shaft of the electric motor 908 is connected to the transmission gear 913, the transmission gear 913 is engaged with the gear ring 914, and a spiral propulsion piece 915 is installed at the bottom of the gear ring 914, and the spiral propulsion piece 915 and the spiral groove 916 are arranged alternately.

[0039] Specifically, sealing strips 919 are installed on both sides of the inner and outer sides of the spiral propulsion piece 915, and the sealing strips 919 are connected to the outer wall of the sand removal cylinder 904 and the inner wall of the tube body 901 respectively.

[0040] It should be noted that when the natural gas passes through the sand removal cylinder 904, the motor 908 runs, and the motor 908 drives the spiral propulsion piece 915 to rotate through the ring gear 914. The sand and gravel thrown out through the sand discharge groove or the spiral groove 916 will first enter the spiral propulsion piece 915 between the sand removal cylinder 904 and the pipe body 901. As the spiral propulsion piece 915 rotates, the sand and gravel are transported to the processing box 903. Since the spiral groove 916, the sand discharge groove and the spiral propulsion piece 915 are all spiral-shaped, the sand and gravel thrown out from the top of the sand removal cylinder 904 and the sand and gravel thrown out from the bottom of the sand removal cylinder 904 can be simultaneously transported toward the manual gate valve 3 through the rotation of the spiral propulsion piece 915, thereby preventing the sand and gravel thrown out from the top of the sand removal cylinder 904 from entering the sand removal cylinder 904 through the bottom of the sand removal cylinder 904.

[0041] See also Figure 3 The processing box 903 is connected to the exhaust port 906 through the exhaust pipe 907.

[0042] Specifically, an infusion port 917 is installed at the bottom of the processing box 903, and water is injected into the processing box 903.

[0043] It should be noted that natural gas contains a high concentration of hydrogen sulfide gas, which can easily corrode wellhead seals and pipe walls, reducing the service life of the wellhead device. Therefore, when natural gas passes through the inner spiral blade 918 and generates centrifugal force, since the molecular mass of hydrogen sulfide gas in natural gas is greater than that of methane, some of the hydrogen sulfide gas in the natural gas will be thrown into the space between the spiral propulsion blades 915 along with the gravel. As the spiral propulsion blades 915 rotate, the methane and hydrogen sulfide in the natural gas, along with the gravel, are transported into the treatment box 903 and into the water inside the treatment box 903. Since hydrogen sulfide gas is easily soluble in water, while methane, the main component of natural gas, is not easily soluble in water, and its relative density is lower than that of air, methane is discharged from the water through the exhaust pipe 907 and the exhaust port 906 to the sand removal assembly 9, effectively reducing the concentration of hydrogen sulfide in the natural gas, reducing the corrosion of seals and pipe walls by high concentrations of hydrogen sulfide, and increasing the service life of the device. Figure 3 Since part of the spiral propulsion piece 915 is located inside the treatment box 903, the rotation of the spiral propulsion piece 915 will stir the liquid inside the treatment box 903, causing it to generate a vortex. When drainage is required, the infusion port 917 is opened, and the sand and gravel in the water are quickly discharged from the treatment box 903 through the vortex.

[0044] It should be noted that two processing boxes 903 are set at the bottom of the processing box 903, one is used to supply water into the processing box 903, and the other is used to drain water from the processing box 903. After the water in the processing box 903 is saturated, the two processing boxes 903 are filled with water and discharged at the same time to ensure the liquid level height of the processing box 903 and the removal efficiency of hydrogen sulfide.

[0045] The implementation principle of the present invention is:

[0046] When the present invention is in use, the manual gate valve 3 is opened, and the sand-carrying natural gas flows from the conversion flange assembly 2 to the four-way pipe 4, passing through the sand removal assembly 9. The natural gas enters the sand removal assembly 9 through the air inlet 905, and enters the sand removal cylinder 904. The natural gas entering the sand removal cylinder 904 forms a vortex under the action of the inner spiral blade 918 and generates an inertial force. The inertial force throws the sand and gravel in the natural gas out of the sand removal cylinder 904 and enters the processing box 903.

[0047] The blade size at the bottom of the inscribed spiral blade 912 is the same as that of the inner spiral piece 918. In the initial state, the blade at the bottom of the inscribed spiral blade 912 is located in the spiral groove 916 at the top of the sand removal cylinder 904, so that the top of the sand removal cylinder 904 is a double spiral blade arrangement of the inner spiral piece 918 and the inscribed spiral blade 912 overlapping. At this time, when the natural gas passes through the top of the sand removal cylinder 904, the path of the natural gas is shortened, and the inertial force of the natural gas when passing through the top of the sand removal cylinder 904 is correspondingly increased, which is conducive to the removal of small particles of sand and gravel.

[0048] When the natural gas pressure decreases, the flow rate of the gas also slows down, and the centrifugal force generated by the inner spiral blade 918 decreases. At the same time, the vortex-shaped gas column formed on the axis of the sand removal cylinder 904 is deformed under the action of the air pressure change, that is, the vortex-shaped gas column formed on the axis of the sand removal cylinder 904 begins to diffuse, and the sand removal efficiency decreases accordingly. The cylinder 910 is started and pushes the inner spiral blade 912 downward through the bearing 911. The inner spiral blade 912 rotates along the spiral groove 916 during the downward push. With the cooperation of the spiral groove 916 and the inner spiral blade 912, the inner spiral blade 912 rotates into the spiral groove 916, so that the inner spiral blade 912 overlaps with the desander cylinder 904. At this time, two adjacent inner spiral blades 918 are separated by the inner spiral blade 912. When the natural gas enters the desander cylinder 904, the path of the natural gas through the inner spiral blade 918 is shortened, and its centrifugal force increases, which is conducive to throwing the sand and gravel in the natural gas out of the desander cylinder 904. As the natural gas pressure decreases, a vortex-shaped gas column is formed on the axis of the desander cylinder 904 and begins to diffuse. Figure 6 When the natural gas passes through the inscribed spiral blades 912, the inscribed spiral blades 912 will guide the diffused gas column and make it gather toward the axis of the sand removal cylinder 904 again, thereby increasing the stability of the gas column and reducing the impact of the gas column on the sand.

[0049] When the natural gas passes through the sand removal cylinder 904, the motor 908 runs, and the motor 908 drives the spiral propulsion piece 915 to rotate through the ring gear 914. The sand and gravel thrown out through the sand discharge groove or the spiral groove 916 will first enter the spiral propulsion piece 915 between the sand removal cylinder 904 and the pipe body 901. As the spiral propulsion piece 915 rotates, the sand and gravel are transported to the processing box 903. Since the spiral groove 916, the sand discharge groove and the spiral propulsion piece 915 are all spiral-shaped, the sand and gravel thrown out from the top of the sand removal cylinder 904 and the sand and gravel thrown out from the bottom of the sand removal cylinder 904 can be simultaneously transported toward the manual gate valve 3 through the rotation of the spiral propulsion piece 915, thereby preventing the sand and gravel thrown out from the top of the sand removal cylinder 904 from entering the sand removal cylinder 904 through the bottom of the sand removal cylinder 904.

[0050] When natural gas passes through the inner spiral blades 918, centrifugal force is generated. Since the molecular mass of hydrogen sulfide in natural gas is greater than that of methane, some of the hydrogen sulfide in the natural gas will be thrown into the space between the spiral propulsion blades 915 along with the gravel. As the spiral propulsion blades 915 rotate, the methane and hydrogen sulfide in the natural gas, along with the gravel, are transported into the treatment box 903 and into the water inside the treatment box 903. Since hydrogen sulfide is easily soluble in water, while methane, the main component of natural gas, is not easily soluble in water, and its relative density is lower than that of air, the methane is discharged from the water through the exhaust pipe 907 and the exhaust port 906 to the sand removal assembly 9, effectively reducing the concentration of hydrogen sulfide in the natural gas, reducing the corrosion of high-concentration hydrogen sulfide on seals and pipe walls, and extending the service life of the device. Figure 3 Since part of the spiral propulsion piece 915 is located inside the treatment box 903, the rotation of the spiral propulsion piece 915 will stir the liquid inside the treatment box 903, causing it to generate a vortex. When drainage is required, the infusion port 917 is opened, and the sand and gravel in the water are quickly discharged from the treatment box 903 through the vortex.

[0051] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A sulfur and carbon dioxide resistant gas injection and production wellhead device, characterized by: It comprises an injection and production four-way assembly (1) and a conversion flange assembly (2) mounted thereon, the conversion flange assembly (2) being connected to a sand removal assembly (9), the sand removal assembly (9) being connected to one interface of a four-way pipe (4) via a manual gate valve (3), the other interfaces of the four-way pipe (4) being respectively mounted with a threaded flange (5), a gas production tree cap (6) and an instrument flange (8), and an elbow (7) being mounted between the four-way pipe (4) and the instrument flange (8); The sand removal assembly (9) comprises a tube body 1 (901) and a tube body 2 (902) mounted thereon, a processing box (903) being mounted at the bottom of the tube body 2 (902), a sand removal cylinder (904) being fixedly mounted inside the tube body 1 (901), one end of the sand removal cylinder (904) being connected to the four-way pipe (4) via an exhaust port (906), and the other end of the exhaust port (906) being connected to the conversion flange assembly (2) via an air inlet (905), an inner spiral blade (918) being mounted inside the sand removal cylinder (904), a spiral groove (916) being provided inside the sand removal cylinder (904), the inner spiral blade (918) and the spiral groove (916) being arranged alternately, a cylinder (910) being mounted inside the tube body 2 (902), the cylinder (910) being connected to the inner spiral blade (912) via a bearing (911), an inclination angle being provided inside the inner spiral blade (912), and the inner spiral blade (912) slidingly located in the spiral groove (916); The interior of the inscribed spiral blade (912) is conical and annular; A spiral propulsion piece (915) is rotatably installed inside the tube body (901), and the spiral propulsion piece (915) is located between the outer wall of the sand removal cylinder (904) and the inner wall of the tube body (901). The inner and outer sides of the spiral propulsion piece (915) are respectively sealed with the outer wall of the sand removal cylinder (904) and the inner wall of the tube body (901), and a portion of the spiral propulsion piece (915) extends into the processing box (903); A gear ring (914) is installed on the outer wall of the sand removal cylinder (904), a transmission box (909) is installed on the outer side of the tube body (901), a motor (908) is installed inside the transmission box (909), an output shaft of the motor (908) is connected to a transmission gear (913), the transmission gear (913) is meshed with the gear ring (914), a spiral propulsion piece (915) is installed at the bottom of the gear ring (914), and the spiral propulsion piece (915) and the spiral groove (916) are arranged alternately; The processing box (903) is connected to the exhaust port (906) via an exhaust pipe (907); An infusion port (917) is installed at the bottom of the treatment box (903), and water is injected into the treatment box (903).

2. The sulfur and carbon dioxide resistant gas injection and production wellhead device according to claim 1, characterized in that: Sealing strips (919) are respectively installed on the inner and outer sides of the spiral propulsion piece (915), and the sealing strips (919) are respectively connected to the outer wall of the sand removal cylinder (904) and the inner wall of the tube body (901).

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