Ultrahigh-pressure gas production wellhead device without any rubber seal

Abstract

The invention belongs to the technical field of gas production wellhead devices, and particularly relates to an ultrahigh pressure gas production wellhead device without any rubber seal, which comprises a four-way pipe, a manual gate valve, a throttle valve, an instrument flange, an anti-shock pressure gauge, a hydraulic safety valve, a separation pressure reduction assembly, an upper flange, a casing head body and a casing hanger assembly, a sealing gasket ring I and a sealing gasket ring II are respectively arranged between the upper flange and the casing hanger assembly, and the casing hanger assembly is respectively connected with an inner cavity of the casing head body through an inner metal sealing ring I, an outer metal sealing ring I, an inner metal sealing ring II and an outer metal sealing ring II. Compared with rubber sealing, the metal sealing structure has higher stability. And the metal sealing element can bear high pressure and cannot generate permanent deformation or lose sealing capacity, so that the gas production device can be suitable for a worse gas production working condition, the frequency of shutdown maintenance caused by damage of the sealing element is reduced, and the continuity and efficiency of gas production operation are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of gas production wellhead devices, and in particular relates to an ultra-high pressure gas production wellhead device without any rubber seal. Background Art

[0002] Ultra-high pressure gas wellhead device is a kind of equipment used in the field of oil and gas extraction. It can withstand extreme high pressure conditions and ensure the safe and reliable extraction of natural gas or oil under high pressure environment. Ultra-high pressure gas wellhead device usually includes two parts: gas tree device and tubing head device. The gas tree device is the main equipment for controlling the production of oil and gas wells. It is composed of upper flange, four manual flat valves, hydraulic safety valve, small four-way valve, etc. The tubing head device includes tubing head body, tubing hanger, etc., which are used to hang the tubing string and seal the annular space between the tubing and casing.

[0003] Ultra-high pressure gas wellhead devices are prone to the following problems during operation; first, traditional gas wellhead devices generally use rubber seals to achieve sealing effects. Under ultra-high pressure environments, rubber materials are prone to irreversible deformation, and the aging process is significantly accelerated, which directly causes its sealing performance to drop drastically, and it is impossible to effectively curb gas leakage; second, the natural gas collected by the wellhead device is generally mixed with gravel and wax media. Under ultra-high pressure conditions, gravel follows the natural gas to spray out at high speed and hit the wellhead, which will have a serious impact on the main valve, causing the main control valve to fail, and in severe cases, it will cause wellhead leakage. Therefore, it is particularly important to remove the sand in the natural gas reaching the wellhead. In addition, the self-spraying pressure is too high, which puts a greater test on the overall valve sealing of the gas tree, and it is easy to cause sealing leakage accidents. Summary of the invention

[0004] The purpose of the present invention is to provide an ultra-high pressure gas production wellhead device without any rubber seal to solve the technical problems in the prior art.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] An ultra-high pressure gas production wellhead device without any rubber seal, comprising a four-way pipe, interfaces on both sides of the four-way pipe are respectively connected to a throttle valve and an instrument flange through manual gate valves, an anti-seismic pressure gauge is installed on the instrument flange, the four-way pipe is connected to a separation pressure reducing assembly through a hydraulic safety valve, the separation pressure reducing assembly is connected to an upper flange, the upper flange is bolted to a casing head body, a casing hanger assembly is installed in the casing head body, and structures on both sides of the casing head body are respectively connected to a threaded flange and a square right-angle stop valve through manual gate valves;

[0007] A sealing gasket ring 1 and a sealing gasket ring 2 are respectively installed between the upper flange and the casing hanger assembly, and the casing hanger assembly is connected to the inner cavity of the casing head body through inner and outer metal sealing rings 1 and inner and outer metal sealing rings 2 respectively; an upper pressure ring is installed at the bottom of the casing head body, the upper pressure ring is connected to the metal pressure ring through inner and outer metal sealing rings 3, and the metal pressure ring is connected to the lower pressure ring through a metal seal;

[0008] The separation and decompression assembly includes a cylinder body and a discharge pipe installed on the cylinder body. A separation cylinder is installed in the cylinder body. The separation cylinder is arranged in a conical shape. Separation holes are respectively provided on the two side walls of the separation cylinder. A decompression component is fixedly installed in the cylinder body. The decompression component is connected with the separation cylinder. A partition plate is installed in the decompression component. The partition plate divides the decompression component into decompression chamber one and decompression chamber two. High-strength airbags are respectively installed in decompression chamber one and decompression chamber two. A rotatable sleeve is installed on the rotating sleeve. The separation cylinder is alternately connected with decompression chamber one and decompression chamber two by rotating the rotating sleeve.

[0009] As a further optimization or improvement of this solution, the pitch of the spiral blades inside the separation cylinder gradually decreases from bottom to top.

[0010] As a further optimization or improvement of this scheme, a transmission member is installed on the cylinder body, the transmission member is connected to the rotating sleeve, and a connecting air hole is provided on the rotating sleeve. The rotating sleeve is driven to rotate by the transmission member so that the connecting air holes on the rotating sleeve are alternately connected with the decompression chamber one and the decompression chamber two.

[0011] As a further optimization or improvement of the present solution, ventilation plates are installed in the decompression chamber one and the decompression chamber two, disc springs are installed on the ventilation plates, the disc springs are connected to the pressure sensors, and the pressure sensors are connected to the transmission parts.

[0012] As a further optimization or improvement of the present solution, pressure rods are respectively installed on both sides of the rotating sleeve, a catheter is rotatably installed in the cylinder, and the pressure rods are located in the catheter and slide.

[0013] As a further optimization or improvement of the present solution, a plurality of negative pressure chambers are arranged in the catheter, and a number of piston heads corresponding to the negative pressure chambers are installed on the pressure rod. The piston heads slide in the negative pressure chambers, and a cone head is connected to the inside of each negative pressure chamber. The cone head is inserted into the separation hole, and micro pores are opened on the cone head.

[0014] As a further optimization or improvement of the present solution, the diameters of the separation holes on the separation cylinder gradually increase from bottom to top.

[0015] Beneficial effects of the present invention:

[0016] (1) When the present invention is in operation, natural gas enters the separation cylinder, and the natural gas generates centrifugal force under the action of the spiral blades inside the separation cylinder, and the gravel impurities in the natural gas are discharged through the separation hole under the action of the centrifugal force. Since the separation cylinder is conical and the pitch of the spiral blades gradually decreases from bottom to top, the centrifugal force generated by the natural gas becomes larger and larger during the process of conveying the natural gas from the bottom to the top of the separation cylinder, and the gravel impurities with smaller volume can be effectively discharged through the separation hole, thereby improving the impurity removal effect of the natural gas.

[0017] (2) When the natural gas in the present invention enters the first decompression chamber through the separation cylinder, the high-strength airbag provides a buffer for the natural gas, thereby reducing the pressure of the natural gas. Then the natural gas is discharged through the vent plate, and the disc spring on the vent plate is compressed. The air pressure passing through the vent plate is detected by the pressure sensor. When the air pressure reaches a specified value, the pressure sensor controls the transmission member to start, and the transmission member drives the rotating sleeve to rotate. The natural gas inside the separation cylinder enters the second decompression chamber. Similarly, the high-strength airbag inside the second decompression chamber reduces the pressure of the natural gas. The above operation is repeated to continuously reduce the pressure of the natural gas, which greatly reduces the impact of the high-pressure produced airflow on the main control valve, which is beneficial to improving the service life of the main control valve.

[0018] (3) When the transmission member of the present invention drives the rotating sleeve to rotate forward, the pressure rod on one side of the rotating sleeve is inserted into the catheter, and the pressure rod drives the catheter to rotate in the direction close to the separation hole, and the cone head is inserted into the separation hole. If the separation hole is blocked by a wax ball, the cone head is inserted into the wax ball; as the transmission member rotates in the opposite direction, the pressure rod is withdrawn from the catheter, and at the same time, the piston head moves and draws out the gas inside the negative pressure chamber, so that the negative pressure chamber is in a negative pressure state. The wax ball inside the separation hole is adsorbed on the cone head under the negative pressure state, and as the catheter rotates, the wax ball is drawn out of the separation hole, thereby clearing the blockage in the separation hole and ensuring the impurity removal efficiency of natural gas.

[0019] (4) The metal sealing structure of the present invention has higher stability than rubber sealing. The metal seal can withstand high pressure without permanent deformation or loss of sealing ability, making the present invention applicable to more severe gas production conditions, reducing the number of shutdowns and repairs caused by seal damage, and improving the continuity and efficiency of gas production operations. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 for Figure 1 A magnified view of the structure of part A.

[0023] Figure 3 for Figure 1 A magnified view of the structure of part B.

[0024] Figure 4 Schematic diagram of the internal structure of the cylinder.

[0025] Figure 5 This is the matching diagram of the swivel sleeve and the pressure relief piece.

[0026] Figure 6 Schematic diagram of the internal structure of the separation cylinder and rotating sleeve.

[0027] Figure 7 for Figure 6 Enlarged view of the C site structure.

[0028] Figure 8 This is the assembly diagram of the pressure relief piece and the swivel sleeve.

[0029] Fig. 9 This is a cross-sectional view of the catheter structure.

[0030] Fig.10 for Fig. 9 Enlarged view of the D part structure.

[0031] Fig.11 for Fig.10 Enlarged view of the structure of part E.

[0032] The following are marked in the figure: 1. throttle valve; 2. manual gate valve; 3. cross-way pipe; 4. instrument flange; 5. seismic pressure gauge; 6. hydraulic safety valve; 7. separation pressure reducing assembly; 701. cylinder; 702. drainage pipe; 703. separation cylinder; 704. transmission part; 705. rotating sleeve; 706. pressure reducing part; 707. pressure rod; 708. guide tube; 709. separation hole; 710. partition plate; 711. pressure reducing chamber 1; 712. pressure reducing chamber 2; 713. high-strength airbag; 714. ventilation plate; 715. disc spring; 716. 16. Pressure sensor; 717. Connecting air hole; 718. Negative pressure chamber; 719. Piston head; 720. Conical head; 721. Micro air hole; 8. Upper flange; 9. Casing head body; 10. Casing hanger assembly; 11. Threaded flange; 12. Square right-angle stop valve; 13. Sealing gasket one; 14. Sealing gasket two; 15. Inner and outer metal sealing ring one; 16. Inner and outer metal sealing ring two; 17. Upper pressure ring; 18. Inner and outer metal sealing ring three; 19. Metal pressure ring; 20. Metal seal; 21. Lower pressure ring. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the 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 creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-Figure 7 , an ultra-high pressure gas production wellhead device without any rubber seal, which includes a four-way pipe 3, the interfaces on both sides of the four-way pipe 3 are respectively connected to the throttle valve 1 and the instrument flange 4 through a manual gate valve 2, and a seismic pressure gauge 5 is installed on the instrument flange 4, the four-way pipe 3 is connected to the separation pressure relief assembly 7 through a hydraulic safety valve 6, the separation pressure relief assembly 7 is connected to the upper flange 8, the upper flange 8 is bolted to the casing head body 9, a casing hanger assembly 10 is installed in the casing head body 9, and the structures on both sides of the casing head body 9 are respectively connected to the threaded flange 11 and the square right-angle stop valve 12 through the manual gate valve 2; a sealing gasket ring 13 and a sealing gasket ring 2 14 are respectively installed between the upper flange 8 and the casing hanger assembly 10, and the casing hanger assembly 10 is connected to the inner cavity of the casing head body 9 through an inner and outer metal sealing ring 15 and an inner and outer metal sealing ring 2 16; an upper pressure ring 17 is installed at the bottom of the casing head body 9, and the upper pressure ring 17 passes through the casing head body 9. A metal pressure ring 19 is connected through inner and outer metal sealing rings 18, and the metal pressure ring 19 is connected to a lower pressure ring 21 through a metal seal 20; the separation and decompression assembly 7 includes a cylinder 701 and a discharge pipe 702 installed on the cylinder 701, a separation cylinder 703 is installed in the cylinder 701, the separation cylinder 703 is arranged in a conical shape, and separation holes 709 are respectively provided on the two side walls of the separation cylinder 703, a decompression member 706 is fixedly installed in the cylinder 701, the decompression member 706 is connected with the separation cylinder 703, a partition plate 710 is installed in the decompression member 706, the partition plate 710 divides the decompression member 706 into a decompression chamber 1 711 and a decompression chamber 2 712, high-strength airbags 713 are respectively installed in the decompression chamber 1 711 and the decompression chamber 2 712, a rotatable rotating sleeve 705 is installed on the rotating sleeve 705, and the separation cylinder 703 is alternately connected with the decompression chamber 1 711 and the decompression chamber 2 712 by rotating the rotating sleeve 705.

[0035] Specifically, a transmission member 704 is installed on the cylinder 701, and the transmission member 704 is connected to the rotating sleeve 705. The rotating sleeve 705 is provided with a communicating air hole 717. The rotating sleeve 705 is driven to rotate by the transmission member 704, so that the communicating air hole 717 on the rotating sleeve 705 is alternately connected with the decompression chamber 1 711 and the decompression chamber 2 712.

[0036] Specifically, a vent plate 714 is installed in both the decompression chamber 1 711 and the decompression chamber 2 712 , a disc spring 715 is installed on the vent plate 714 , the disc spring 715 is connected to a pressure sensor 716 , and the pressure sensor 716 is connected to the transmission member 704 .

[0037] Specifically, the pitch of the spiral blades inside the separation cylinder 703 gradually decreases from bottom to top.

[0038] It should be noted that, under ultra-high pressure environment, the metal sealing structure of the present invention has higher stability than rubber sealing. The metal seal 20 can withstand pressures up to 265MPa without permanent deformation or loss of sealing ability. Experimental data show that the leakage rate of the metal seal is always less than 0.01% after 1000 hours of continuous testing at a pressure of 175MPa, while the leakage rate of the traditional rubber seal exceeds 1% after 200 hours under the same pressure. This is because the metal seal relies on its own elastic deformation and metal bonding at the microscopic level to achieve sealing, and will not fail due to high pressure like rubber, such as extrusion and tearing; at the same time, the metal seal has a stronger tolerance to temperature and corrosive media. In a simulated gas production environment containing corrosive gases such as hydrogen sulfide and carbon dioxide and a temperature of up to 150°C, after 500 hours of testing, the surface corrosion depth of the metal seal 20 is only 0.05 mm, and the sealing performance remains basically unchanged; while the rubber seal suffers from severe corrosion and sealing failure after 100 hours under the same environment. This enables the wellhead device to be suitable for more severe gas production conditions, reduces the number of shutdowns for maintenance due to seal damage, and improves the continuity and efficiency of gas production operations.

[0039] It should be noted that see Figure 1 The upper flange 8 and the components above the upper flange 8 are the gas tree device, including the throttle valve 1, the manual gate valve 2, the four-way pipe 3, the instrument flange 4, the seismic pressure gauge 5, the hydraulic safety valve 6 and the separation and pressure relief assembly 7; the components below the upper flange 8 are the tubing head device, including the casing head body 9, the casing hanger assembly 10, the threaded flange 11 and the square right-angle stop valve 12 and the metal seal 20 inside the casing head body 9.

[0040] When the present invention is in operation, natural gas enters the separation and decompression assembly 7 through the casing head body 9. During this process, the natural gas first enters the separation cylinder 703. Under the action of the spiral blades inside the separation cylinder 703, the natural gas generates centrifugal force, and the gravel impurities in the natural gas are discharged through the separation hole 709 under the action of the centrifugal force. Since the separation cylinder 703 is conically arranged and the pitch of the spiral blades gradually decreases from bottom to top, the centrifugal force generated by the natural gas during the process of conveying the natural gas from the bottom to the top of the separation cylinder 703 is getting bigger and bigger, so that the small gravel impurities can be effectively discharged through the separation hole 709, thereby improving the impurity removal effect of the natural gas.

[0041] See also Figure 7, natural gas enters the decompression chamber 711 through the separation cylinder 703. During this process, high-pressure gas is filled into the high-strength airbag 713, so that the high-strength airbag 713 is in an inflated state. The internal gas of the high-strength airbag 713 is squeezed by the natural gas, and the internal gas of the high-strength airbag 713 is discharged, so that the high-strength airbag 713 provides a buffer for the natural gas, thereby reducing the pressure of the natural gas. Then the natural gas is discharged through the vent plate 714. When the natural gas is discharged through the vent plate 714, the natural gas puts pressure on the vent plate 714, so that the disc spring 715 on the vent plate 714 is compressed. When the natural gas pressure gradually increases, the compression amount of the disc spring 715 increases, and the air pressure passing through the vent plate 714 is detected by the pressure sensor 716. When the air pressure reaches After the specified value is reached, the pressure sensor 716 controls the transmission member 704 to start, so that the transmission member 704 drives the rotating sleeve 705 to rotate. As the rotating sleeve 705 rotates, the connecting air hole 717 is connected with the decompression chamber 712, and the natural gas inside the separation cylinder 703 enters the decompression chamber 712. Similarly, the high-strength air bag 713 inside the decompression chamber 712 reduces the pressure of the natural gas. When the air pressure inside the high-strength air bag 713 reaches the specified value, the transmission member 704 is started again, so that the transmission member 704 drives the rotating sleeve 705 to rotate in the opposite direction, so that the connecting air hole 717 is connected with the decompression chamber 1 711. The above operation is repeated to continuously reduce the pressure of the natural gas, which greatly reduces the impact of the high-pressure produced airflow on the main control valve, which is beneficial to improving the service life of the main control valve.

[0042] It should be noted that in order to ensure accurate pressure reduction of natural gas, a constant pressure valve can be installed on the vent plate 714. After the natural gas enters the pressure reducing chamber 711, the pressure reduction is achieved by squeezing the high-strength airbag 713 by the natural gas. When the pressure reaches the preset value of the constant pressure valve, the constant pressure valve opens.

[0043] The impurity discharge pipe 702 is a pipe opening for separating impurities separated from natural gas. When the present invention stops running, the impurity discharge pipe 702 is connected to the pump body, and the impurities inside the cylinder 701 are pumped out through the pump body.

[0044] See also Figure 9-11 The pressure rods 707 are respectively installed on both sides of the rotating sleeve 705, and the guide tube 708 is rotatably installed in the cylinder 701, and the pressure rod 707 is located in the guide tube 708 and slides.

[0045] Specifically, a plurality of negative pressure chambers 718 are provided in the catheter 708, and a number of piston heads 719 corresponding to the negative pressure chambers 718 are installed on the pressure rod 707. The piston heads 719 slide in the negative pressure chambers 718. A cone head 720 is connected to the inside of each negative pressure chamber 718. The cone head 720 is inserted into the separation hole 709, and micro pores 721 are opened on the cone head 720.

[0046] It should be noted that the negative pressure chambers 718 inside the catheter 708 are not connected to each other.

[0047] It should be noted that since the waxy medium is mixed in the natural gas, the waxy medium rolls along the separation cylinder 703 in a spiral, causing the sand particles and wax in the natural gas to condense into agglomerates, which may cause the separation holes 709 on the separation cylinder 703 to be blocked, thereby affecting the natural gas impurity removal efficiency.

[0048] When in use, as the transmission member 704 drives the rotating sleeve 705 to rotate, Fig. 9 The pressure rod 707 on one side of the rotating sleeve 705 is inserted into one of the catheters 708, and the pressure rod 707 on the other side of the rotating sleeve 705 is pulled out from the other catheter 708.

[0049] The transmission member 704 drives the rotating sleeve 705 to rotate forward, and the pressure rod 707 on one side of the rotating sleeve 705 is inserted into the catheter 708, and the pressure rod 707 drives the catheter 708 to rotate in the direction close to the separation hole 709, see Fig.10 , the piston head 719 is pushed into the negative pressure chamber 718, and the gas inside the negative pressure chamber 718 is discharged from the micropores 721 on the cone head 720. As the conduit 708 rotates, the cone head 720 is inserted into the separation hole 709. If the separation hole 709 is blocked by a wax ball, the cone head 720 is inserted into the wax ball; as the transmission member 704 rotates in the opposite direction, the pressure rod 707 is withdrawn from the conduit 708, and the pressure rod 707 drives the cone head 720 on the conduit 708 away from the separation hole 709. At the same time, the piston head 719 moves and draws out the gas inside the negative pressure chamber 718, so that the negative pressure chamber 718 is in a negative pressure state. The wax ball inside the separation hole 709 is adsorbed on the cone head 720 under the negative pressure state, and the wax ball is drawn out of the separation hole 709 as the conduit 708 rotates, so that the blockage of the separation hole 709 is cleaned, thereby ensuring the impurity removal efficiency of natural gas. As the transmission member 704 rotates forward, the piston head 719 on the pressure rod 707 compresses the gas inside the negative pressure chamber 718 again, so that the gas inside the negative pressure chamber 718 is discharged through the micro-pores 721 on the cone head 720, thereby separating the wax ball from the cone head 720.

[0050] See also Figure 10-11 The diameter of the separation holes 709 on the separation cylinder 703 gradually increases from bottom to top.

[0051] It should be noted that if gravel clogs the smaller separation hole 709 at the bottom of the separation cylinder 703, as the guide tube 708 rotates and drives the cone head 720 to be inserted into the separation hole 709, the cone head 720 pushes the gravel inside the separation hole 709 into the separation cylinder 703. Under the action of air pressure, the gravel pushed into the separation cylinder 703 will be discharged from the larger separation hole 709 at the top of the separation cylinder 703, thereby greatly improving the separation effect of natural gas.

[0052] The implementation principle of the present invention is:

[0053] When the present invention is in operation, natural gas enters the separation and decompression assembly 7 through the casing head body 9. During this process, the natural gas first enters the separation cylinder 703. Under the action of the spiral blades inside the separation cylinder 703, the natural gas generates centrifugal force, and the gravel impurities in the natural gas are discharged through the separation hole 709 under the action of the centrifugal force. Since the separation cylinder 703 is conically arranged and the pitch of the spiral blades gradually decreases from bottom to top, the centrifugal force generated by the natural gas during the process of conveying the natural gas from the bottom to the top of the separation cylinder 703 is getting bigger and bigger, so that the small gravel impurities can be effectively discharged through the separation hole 709, thereby improving the impurity removal effect of the natural gas.

[0054] See also Figure 7 , natural gas enters the decompression chamber 711 through the separation cylinder 703. During this process, high-pressure gas is filled into the high-strength airbag 713, so that the high-strength airbag 713 is in an inflated state. The internal gas of the high-strength airbag 713 is squeezed by the natural gas, and the internal gas of the high-strength airbag 713 is discharged, so that the high-strength airbag 713 provides a buffer for the natural gas, thereby reducing the pressure of the natural gas. Then the natural gas is discharged through the vent plate 714. When the natural gas is discharged through the vent plate 714, the natural gas puts pressure on the vent plate 714, so that the disc spring 715 on the vent plate 714 is compressed. When the natural gas pressure gradually increases, the compression amount of the disc spring 715 increases, and the air pressure passing through the vent plate 714 is detected by the pressure sensor 716. When the air pressure reaches After the specified value is reached, the pressure sensor 716 controls the transmission member 704 to start, so that the transmission member 704 drives the rotating sleeve 705 to rotate. As the rotating sleeve 705 rotates, the connecting air hole 717 is connected with the decompression chamber 712, and the natural gas inside the separation cylinder 703 enters the decompression chamber 712. Similarly, the high-strength air bag 713 inside the decompression chamber 712 reduces the pressure of the natural gas. When the air pressure inside the high-strength air bag 713 reaches the specified value, the transmission member 704 is started again, so that the transmission member 704 drives the rotating sleeve 705 to rotate in the opposite direction, so that the connecting air hole 717 is connected with the decompression chamber 1 711. The above operation is repeated to continuously reduce the pressure of the natural gas, which greatly reduces the impact of the high-pressure produced airflow on the main control valve, which is beneficial to improving the service life of the main control valve.

[0055] Since the waxy medium is mixed in the natural gas, the waxy medium rolls along the separation cylinder 703 in a spiral, causing the sand particles and wax in the natural gas to condense into agglomerates, which may cause the separation holes 709 on the separation cylinder 703 to be blocked, thereby affecting the natural gas impurity removal efficiency.

[0056] Therefore, when the present invention is in use, as the transmission member 704 drives the rotating sleeve 705 to rotate, Fig. 9 The pressure rod 707 on one side of the rotating sleeve 705 is inserted into one of the catheters 708, and the pressure rod 707 on the other side of the rotating sleeve 705 is pulled out from the other catheter 708.

[0057] When the transmission member 704 drives the rotating sleeve 705 to rotate forward, the pressure rod 707 on one side of the rotating sleeve 705 is inserted into the guide tube 708, and the pressure rod 707 drives the guide tube 708 to rotate in the direction close to the separation hole 709. Fig.10 , the piston head 719 is pushed into the negative pressure chamber 718, and the gas inside the negative pressure chamber 718 is discharged from the micropores 721 on the cone head 720. As the conduit 708 rotates, the cone head 720 is inserted into the separation hole 709. If the separation hole 709 is blocked by a wax ball, the cone head 720 is inserted into the wax ball; as the transmission member 704 rotates in the opposite direction, the pressure rod 707 is withdrawn from the conduit 708, and the pressure rod 707 drives the cone head 720 on the conduit 708 away from the separation hole 709. At the same time, the piston head 719 moves and draws out the gas inside the negative pressure chamber 718, so that the negative pressure chamber 718 is in a negative pressure state. The wax ball inside the separation hole 709 is adsorbed on the cone head 720 under the negative pressure state, and the wax ball is drawn out of the separation hole 709 as the conduit 708 rotates, so that the blockage of the separation hole 709 is cleaned, thereby ensuring the impurity removal efficiency of natural gas. As the transmission member 704 rotates forward, the piston head 719 on the pressure rod 707 compresses the gas inside the negative pressure chamber 718 again, so that the gas inside the negative pressure chamber 718 is discharged through the micro-pores 721 on the cone head 720, thereby separating the wax ball from the cone head 720.

[0058] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. An ultra-high pressure gas production wellhead device without any rubber seal, characterized in that: It comprises a four-way pipe (3), the interfaces on both sides of the four-way pipe (3) are respectively connected to a throttle valve (1) and an instrument flange (4) through a manual gate valve (2), an anti-seismic pressure gauge (5) is installed on the instrument flange (4), the four-way pipe (3) is connected to a separation pressure reducing assembly (7) through a hydraulic safety valve (6), the separation pressure reducing assembly (7) is connected to an upper flange (8), the upper flange (8) is bolted to a casing head body (9), a casing hanger assembly (10) is installed in the casing head body (9), and the structures on both sides of the casing head body (9) are respectively connected to a threaded flange (11) and a square right-angle stop valve (12) through a manual gate valve (2); A sealing gasket ring 1 (13) and a sealing gasket ring 2 (14) are respectively installed between the upper flange (8) and the casing hanger assembly (10); the casing hanger assembly (10) is connected to the inner cavity of the casing head body (9) through an inner and outer metal sealing ring 1 (15) and an inner and outer metal sealing ring 2 (16); an upper pressure ring (17) is installed at the bottom of the casing head body (9); the upper pressure ring (17) is connected to a metal pressure ring (19) through an inner and outer metal sealing ring 3 (18); and the metal pressure ring (19) is connected to a lower pressure ring (21) through a metal seal (20); The separation and decompression assembly (7) comprises a cylinder (701) and a waste pipe (702) installed on the cylinder (701); a separation cylinder (703) is installed in the cylinder (701); the separation cylinder (703) is arranged in a conical shape; separation holes (709) are respectively provided on the two side walls of the separation cylinder (703); a decompression member (706) is fixedly installed in the cylinder (701); the decompression member (706) is connected to the separation cylinder (703); a pressure relief member (706) is installed in the decompression member (706) A partition plate (710) is provided, and the partition plate (710) divides the decompression component (706) into a decompression chamber 1 (711) and a decompression chamber 2 (712). The decompression chamber 1 (711) and the decompression chamber 2 (712) are respectively installed with high-strength air bags (713). A rotatable rotating sleeve (705) is installed on the rotating sleeve (705). By rotating the rotating sleeve (705), the separation cylinder (703) is alternately connected with the decompression chamber 1 (711) and the decompression chamber 2 (712).

2. The ultra-high pressure gas production wellhead device without any rubber seal according to claim 1, characterized in that: The pitch of the spiral blades inside the separation cylinder (703) gradually decreases from bottom to top.

3. The ultra-high pressure gas production wellhead device without any rubber seal according to claim 1, characterized in that: A transmission member (704) is installed on the cylinder (701), and the transmission member (704) is connected to the rotating sleeve (705). A communicating air hole (717) is provided on the rotating sleeve (705). The rotating sleeve (705) is driven to rotate by the transmission member (704), so that the communicating air hole (717) on the rotating sleeve (705) is alternately connected with the first decompression chamber (711) and the second decompression chamber (712).

4. The ultra-high pressure gas production wellhead device without any rubber seal according to claim 1, characterized in that: A vent plate (714) is installed in both the decompression chamber 1 (711) and the decompression chamber 2 (712), a disc spring (715) is installed on the vent plate (714), the disc spring (715) is connected to a pressure sensor (716), and the pressure sensor (716) is connected to the transmission member (704).

5. The ultra-high pressure gas production wellhead device without any rubber seal according to claim 1, characterized in that: Pressure rods (707) are respectively installed on both sides of the rotating sleeve (705), and a guide tube (708) is rotatably installed in the cylinder (701), and the pressure rod (707) is located in the guide tube (708) and slides.

6. The ultra-high pressure gas production wellhead device without any rubber seal according to claim 5, characterized in that: A plurality of negative pressure chambers (718) are arranged in the catheter (708), and a piston head (719) corresponding to the number of negative pressure chambers (718) is installed on the pressure rod (707). The piston head (719) slides in the negative pressure chamber (718), and a cone head (720) is connected to the inside of each negative pressure chamber (718). The cone head (720) is inserted into the separation hole (709), and micro air holes (721) are opened on the cone head (720).

7. The ultra-high pressure gas production wellhead device without any rubber seal according to claim 1, characterized in that: The diameter of the separation holes (709) on the separation cylinder (703) gradually increases from bottom to top.

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