Fracturing wellhead device

Abstract

This invention relates to the field of low-carbon mining technology, specifically to a fracturing wellhead device, comprising a main unit including a delivery pipeline, an inlet valve mounted on the delivery pipeline, and an inlet connector mounted on the inlet valve; a pressure relief unit including a pressure relief mechanism mounted on the delivery pipeline and a recovery mechanism mounted on the pressure relief mechanism; and a sealing unit including a sealing mechanism mounted on the pressure relief mechanism for opening and closing the pressure relief mechanism and an adjustment mechanism mounted on the pressure relief mechanism. Through the cooperation of the adjustable pre-pressure sealing mechanism and the adjustment mechanism, the pressure relief threshold can be flexibly adjusted without replacing parts, adapting to different well depths and fracturing fluid types. Furthermore, the core pressure relief components are reusable, avoiding frequent downtime for consumable replacement. This not only improves mining efficiency but also reduces consumable consumption, enhances the device's adaptability to different operating conditions, and further reduces the cost of low-carbon mining operations.

Description

Technical Field

[0001] This invention relates to the field of low-carbon oilfield extraction technology, specifically to fracturing wellhead devices. Background Technology

[0002] In the field of shale gas extraction technology, wellhead equipment, also known as a tree in oilfield production equipment, is the core equipment for fracturing operations in oil and gas wells. Its core function is to connect the surface fracturing system with the downhole formation, realize the directional delivery of high-pressure fracturing fluid, provide stable power for formation fracturing and supporting fractures, and ultimately increase oil and gas production to meet the needs of low-carbon extraction. Currently, fracturing wellhead equipment on the market mainly relies on two pressure relief methods when dealing with pipeline overpressure problems: rupture discs or traditional fixed threshold safety valves. Rupture discs are disposable pressure relief components. When overpressure occurs, pressure is relieved by the rupture of a thin metal sheet. Although the response speed is fast, the machine needs to be stopped and replaced after rupture, which not only interrupts fracturing operations and reduces construction efficiency, but also wastes consumables. Traditional fixed threshold safety valves can be reused, but their pressure relief threshold is not easy to adjust flexibly according to different working conditions, such as the difference in formation pressure between shallow wells and ultra-deep wells, and the delivery requirements of fracturing fluids with different viscosities. Their adaptability is relatively limited.

[0003] In light of this, we propose a fracturing wellhead device. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a fracturing wellhead device that effectively solves the problems of existing technologies relying on disposable rupture discs, which require downtime for replacement and result in material waste. While traditional fixed threshold safety valves can be reused, they are difficult to adapt to the operating conditions of fracturing fluids with different depths and viscosities.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a fracturing wellhead device, comprising a main unit, including a delivery pipeline, an inlet valve disposed on the delivery pipeline, and an inlet connector disposed on the inlet valve, comprising,

[0007] The pressure relief unit includes a pressure relief mechanism installed on the delivery pipeline and a recovery mechanism installed on the pressure relief mechanism. The recovery mechanism can be used to recover the fracturing fluid leaking under pressure relief conditions.

[0008] The sealing unit includes a sealing mechanism disposed on the pressure relief mechanism for switching the pressure relief mechanism on and off, and an adjusting mechanism disposed on the pressure relief mechanism, the adjusting mechanism being used to adjust the prepressure of the sealing mechanism.

[0009] Furthermore, the input end of the conveying pipeline is fixedly connected to the output end of the oil inlet valve, and the input end of the oil inlet valve is fixedly connected to the output end with an oil inlet connector.

[0010] Furthermore, the pressure relief mechanism includes a pressure relief cylinder fixedly connected to the top of the conveying pipeline, a side fixing box fixedly connected to one side of the pressure relief cylinder, and a tapered hole opened inside the pressure relief cylinder.

[0011] Furthermore, the recovery mechanism includes a connecting pipe fixedly connected to one side of the pressure relief cylinder, with one end of the connecting pipe near the pressure relief cylinder communicating with a conical hole.

[0012] Furthermore, a one-way valve is fixedly connected to the end of the connecting pipe away from the pressure relief cylinder, and a recovery connector is fixedly connected to the output end of the one-way valve.

[0013] Furthermore, the sealing mechanism includes a piston cylinder fixedly connected to the inner wall of the pressure relief cylinder, a piston rod sleeved on the inner wall of the piston cylinder, a conical sealing column fixedly connected to the bottom of the piston rod, and the surface of the conical sealing column sleeved on the inner wall of the conical hole.

[0014] Furthermore, a sleeve plate is slidably connected to the surface of the piston rod, the surface of the sleeve plate is fitted onto the inner wall of the pressure relief cylinder, a spring is fixedly connected to the bottom of the sleeve plate, and the end of the spring away from the sleeve plate is fixedly connected to the top of the conical sealing column.

[0015] Furthermore, the adjusting mechanism includes a rack fixedly connected to one side of the sleeve plate, with the surface of the rack slidably connected to the inner wall of the side fixing box.

[0016] Furthermore, a gear is meshed on the side of the rack away from the sleeve plate, the axial side of the gear is rotatably connected to the inner wall of the side fixing box, a worm gear is fixedly connected to the other side of the gear, and a worm is meshed on the radial side of the worm gear.

[0017] Furthermore, a fixed shaft is fixedly connected to the inner wall of the worm gear. One end of the fixed shaft is rotatably connected to the inner wall of the side fixing box, and the other end of the fixed shaft rotates through the side fixing box and is fixedly connected to a handwheel.

[0018] The technical solution provided by this invention has the following advantages compared with known public technologies:

[0019] This invention achieves flexible adjustment of the pressure relief threshold through the cooperation of an adjustable pre-pressure sealing mechanism and an adjustment mechanism, without the need to replace parts. It can adapt to the working conditions of different well depths and different fracturing fluid types. Furthermore, it adopts a conical sealing structure and elastic pre-pressure design, combined with the selection of erosion-resistant and corrosion-resistant materials. The core pressure relief components can be reused, avoiding frequent downtime for replacement of consumables. This not only improves the efficiency of mining operations but also reduces the consumption of consumables, while enhancing the adaptability of the equipment to different working conditions and further reducing the cost of low-carbon mining operations. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the main body unit and pressure relief unit of the present invention;

[0023] Figure 3 This is a cross-sectional view of the pressure relief cylinder of the present invention;

[0024] Figure 4 This is a schematic diagram showing the disassembled structure of the pressure relief unit and sealing unit of the present invention;

[0025] Figure 5 For the present invention Figure 4 An enlarged schematic diagram of the structure at point A.

[0026] The labels in the diagram represent: 100, main unit; 101, conveying pipeline; 102, oil inlet connector; 103, oil inlet valve;

[0027] 200. Pressure relief unit; 201. Pressure relief mechanism; 2011. Pressure relief cylinder; 2012. Side fixing box; 2013. Tapered hole; 202. Recovery mechanism; 2021. Connecting pipe; 2022. Check valve; 2023. Recovery connector;

[0028] 300, Sealing unit; 301, Sealing mechanism; 3011, Conical sealing column; 3012, Piston rod; 3013, Spring; 3014, Sleeve plate; 3015, Piston cylinder; 302, Adjusting mechanism; 3021, Rack; 3022, Gear; 3023, Handwheel; 3024, Fixed shaft; 3025, Worm gear; 3026, Worm. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] The present invention will be further described below with reference to embodiments.

[0031] like Figures 1 to 5 As shown, the fracturing wellhead device includes a main unit 100, a delivery pipeline 101, an inlet valve 103 installed on the delivery pipeline 101, and an inlet connector 102 installed on the inlet valve 103. The input end of the delivery pipeline 101 is fixedly connected to the output end of the inlet valve 103, and the output end of the inlet connector 102 is fixedly connected to the input end of the inlet valve 103. The inlet connector 102 in the main unit 100 serves as the inlet connection for fracturing fluid and is a key connection node between the surface fracturing system and the wellhead device. Before fracturing operations, the output pipelines of equipment such as the surface sand mixing truck and fracturing pump truck need to be connected to the oil inlet connector 102. The oil inlet valve 103 is directly connected to the output end of the oil inlet connector 102. The valve core opens and closes to achieve precise control of the fracturing fluid delivery. The delivery pipeline 101 serves as the fluid delivery channel of the main unit 100. Its input end is fixedly connected to the output end of the oil inlet valve 103. It is responsible for directionally delivering the fracturing fluid regulated by the oil inlet valve 103 to the downhole casing or tubing.

[0032] Specifically, the pressure relief unit 200 includes a pressure relief mechanism 201 installed on the delivery pipeline 101 and a recovery mechanism 202 installed on the pressure relief mechanism 201. The recovery mechanism 202 can be used to recover the fracturing fluid leaking under pressure relief conditions. The sealing unit 300 includes a sealing mechanism 301 installed on the pressure relief mechanism 201 for opening and closing the pressure relief mechanism 201, and an adjusting mechanism 302 installed on the pressure relief mechanism 201. The adjusting mechanism 302 can be used to adjust the pre-pressure of the sealing mechanism 301. The pressure relief mechanism 201 is integrated into the high-pressure section of the delivery pipeline 101. When the fracturing fluid pressure in the delivery pipeline 101 exceeds a preset safety threshold, the pressure relief mechanism 201, in conjunction with the sealing mechanism 301, will automatically... The pressure relief channel is opened to quickly divert the overpressured fracturing fluid. The recovery mechanism 202 is directly connected to the discharge end of the pressure relief mechanism 201, which can collect the fracturing fluid leaking under pressure relief conditions in a directional manner, preventing the fracturing fluid from being directly discharged and causing waste and pollution. The sealing mechanism 301 acts as the switch control of the pressure relief mechanism 201. Under the action of pre-pressure, the sealing mechanism 301 tightly seals the pressure relief channel to ensure that the fracturing fluid flows normally along the delivery pipeline 101. When the pipeline pressure exceeds the limit, the sealing mechanism 301 opens the pressure relief mechanism 201 and triggers the pressure relief process. The regulating mechanism 302 is used to regulate the pressure value of the sealing mechanism 301. By adjusting the pre-tightening force of the internal elastic component, the opening pressure threshold of the sealing mechanism 301 can be changed.

[0033] Specifically, the pressure relief mechanism 201 includes a pressure relief cylinder 2011 fixedly connected to the top of the delivery pipeline 101, a side fixing box 2012 fixedly connected to one side of the pressure relief cylinder 2011, and a conical hole 2013 opened inside the pressure relief cylinder 2011. The recovery mechanism 202 includes a connecting pipe 2021 fixedly connected to one side of the pressure relief cylinder 2011, with one end of the connecting pipe 2021 near the pressure relief cylinder 2011 communicating with the conical hole 2013, and a one-way valve 2022 fixedly connected to the other end of the connecting pipe 2021 away from the pressure relief cylinder 2011. A recovery connector 2023 is fixedly connected to the output end of the one-way valve 2022. The recovery connector 2023 can be used to connect to external recovery pipelines and recovery equipment, etc., so that when the pipeline pressure of the delivery pipeline 101 is too high, the leaked fracturing fluid can be recovered into the recovery equipment for centralized collection of the fracturing fluid.

[0034] It should be noted that the pressure relief cylinder 2011 is integrated with the delivery pipeline 101, and its internal flow channel is directly connected to the high-pressure chamber of the delivery pipeline 101. When the pressure inside the delivery pipeline 101 exceeds a preset threshold, the high-pressure fracturing fluid can quickly enter the pressure relief cylinder 2011, providing flow space for subsequent pressure relief. Simultaneously, the pressure relief cylinder 2011 is made of high-strength alloy material, capable of withstanding instantaneous overpressure during fracturing operations, preventing pressure relief failure due to high-pressure deformation. The side fixing box 2012 is fixedly connected. On one side of the pressure relief cylinder 2011, serving as the mounting carrier for the regulating mechanism 302, a tapered hole 2013 is formed inside the pressure relief cylinder 2011. Its tapered structure precisely matches the shape of the tapered sealing column 3011 in the sealing mechanism 301. One end of the connecting pipe 2021 is fixedly connected to the pressure relief cylinder 2011, and its internal flow channel communicates with the tapered hole 2013, forming an intermediate transport channel for fracturing fluid from the pressure relief cylinder 2011 to the external recovery equipment. In case of overpressure, the fracturing fluid can flow directly into the connecting pipe 2021. The connecting pipe 2021 features an erosion-resistant inner wall design, capable of withstanding the high-speed erosion of sand-containing fracturing fluid and preventing leakage or pressure loss due to pipe wall wear after long-term use. The one-way valve 2022 is fixedly connected to the end of the connecting pipe 2021 furthest from the pressure relief cylinder 2011. Its core function is to achieve one-way flow control of the fracturing fluid. During pressure relief, the one-way valve 2022 automatically opens under the pressure of the fracturing fluid, allowing the fracturing fluid to flow to the recovery equipment; when pressure relief ends and the pipeline pressure returns to normal, the one-way valve 2022... The device automatically closes under its own elastic force to prevent fracturing fluid in the recovery equipment from flowing back into the connecting pipe 2021 and the pressure relief cylinder 2011 due to reverse pressure, thus avoiding contamination of the main delivery pipeline or affecting the reset and sealing of the sealing mechanism 301. The recovery connector 2023 is fixedly connected to the output end of the one-way valve 2022 and serves as the interface component between the recovery mechanism 202 and the external recovery equipment. Its interface specifications are compatible with the industry-standard high-pressure union or flange connection, and can be quickly connected to the pipelines of external recovery tanks, filtration systems and other equipment.

[0035] Furthermore, the sealing mechanism 301 includes a piston cylinder 3015 fixedly connected to the inner wall of the pressure relief cylinder 2011. A piston rod 3012 is sleeved on the inner wall of the piston cylinder 3015. A conical sealing column 3011 is fixedly connected to the bottom of the piston rod 3012. The surface of the conical sealing column 3011 is sleeved on the inner wall of the conical hole 2013. A sleeve plate 3014 is slidably connected to the surface of the piston rod 3012. The surface of the sleeve plate 3014 is sleeved on the inner wall of the pressure relief cylinder 2011. A spring 3013 is fixedly connected to the bottom of the 3014. The end of the spring 3013 away from the sleeve plate 3014 is fixedly connected to the top of the conical sealing column 3011. Smooth rubber pads are provided on the surface of the conical sealing column 3011 and the inner wall of the conical hole 2013 to ensure that the conical sealing column 3011 can be stably inserted into the conical hole 2013. At the same time, when the conical sealing column 3011 is inserted into the conical hole 2013, it can achieve a seal on the infusion line.

[0036] It should be noted that the piston rod 3012, piston cylinder 3015, and spring 3013 form an elastic telescopic rod structure. The elasticity of the spring 3013 is converted into pressure on the conical sealing column 3011, thereby ensuring the sealing of the delivery pipeline 101 and the normal delivery of fracturing fluid under normal pipeline pressure. The sleeve 3014 sliding on the piston rod 3012 cooperates with the adjustment mechanism 302 and can be used to adjust the pre-pressure of the spring 3013, thereby realizing the pressure adjustment of the conical sealing column 3011. When the internal pressure of the delivery pipeline 101 is overpressurized, the spring 3013 is compressed, and the conical sealing column 3011 rises, exceeding the position where the connecting pipe 2021 and the conical hole 2013 are connected, so that the fracturing fluid can enter the connecting pipe 2021 and flow to the external recovery equipment.

[0037] Furthermore, in the adjusting mechanism 302, a rack 3021 is fixedly connected to one side of the sleeve plate 3014. The surface of the rack 3021 is slidably connected to the inner wall of the side fixing box 2012. A gear 3022 is meshed on the side of the rack 3021 away from the sleeve plate 3014. The axial side of the gear 3022 is rotatably connected to the inner wall of the side fixing box 2012. A worm gear 3025 is fixedly connected to the other side of the gear 3022. A worm 3026 is meshed on the radial side of the worm gear 3025. A fixed shaft 3024 is fixedly connected to the inner wall of the 26. One end of the fixed shaft 3024 is rotatably connected to the inner wall of the side fixed box 2012, and the other end of the fixed shaft 3024 rotates through the side fixed box 2012 and is fixedly connected to a handwheel 3023. During the rising process of the conical sealing column 3011, the surface is always in contact with the inner wall of the conical hole 2013, which can effectively prevent fracturing fluid from entering above the conical sealing column 3011 and affecting the normal operation of the upper sealing mechanism 301 and related components of the adjustment mechanism 302.

[0038] It should be noted that by rotating the handwheel 3023, the worm gear 3026 on the fixed shaft 3024, in conjunction with the worm wheel 3025, can drive the gear 3022 to rotate. This, in turn, engages with the rack 3021, which meshes with the gear 3022, thus moving the sleeve plate 3014. Because the rack 3021 slides on the side fixed box 2012, the stability of the rack 3021 driving the sleeve plate 3014 during movement is ensured. Through the movement of the sleeve plate 3014, the spring 3013 can be compressed and stretched, thereby adjusting the pressure of the conical sealing column 3011.

[0039] The working principle of this invention is as follows: Before the fracturing operation is started, the output pipelines of equipment such as the ground sand mixing truck and the fracturing pump truck are first connected to the oil inlet connector 102. The oil inlet connector 102 is made of high-strength alloy material, and the interface meets the high-pressure sealing standard. It can withstand a system pressure of 70-140MPa to ensure that there is no leakage when the fracturing fluid is introduced from the ground to the wellhead, thus avoiding the waste of fracturing fluid in subsequent low-carbon extraction.

[0040] After the construction starts, the inlet valve 103 is opened, and the fracturing fluid prepared on the ground enters the inlet valve 103 through the inlet connector 102. By adjusting the opening degree of the inlet valve 103, the fracturing fluid flow rate can be precisely controlled, so that the fracturing fluid flows into the delivery pipeline 101 according to the preset pumping program. The delivery pipeline 101 is made of erosion-resistant high-pressure alloy pipe, and the inner wall is treated with tungsten carbide coating, which can resist the high-speed erosion of sand-containing fracturing fluid, avoid fracturing fluid leakage and resource waste caused by pipe wall wear, and at the same time ensure that the fracturing fluid is delivered to the downhole casing or tubing at a stable pressure and flow rate, providing continuous power for formation fracturing.

[0041] During this stage, the sealing unit 300 is in a sealed state: the piston cylinder 3015 is made of corrosion-resistant stainless steel and is fixed to the inner wall of the pressure relief cylinder 2011. The piston rod 3012 is sleeved inside the piston cylinder 3015. The surface of the tapered sealing column 3011 at its bottom is covered with an oil-resistant rubber gasket. Under the pre-pressure of the spring 3013, it fits tightly with the tapered hole 2013 inside the pressure relief cylinder 2011, thereby sealing the pressure relief channel and ensuring that all fracturing fluid is transported along the main route of the delivery pipeline 101 without additional loss.

[0042] When the fracturing fluid pressure in the delivery pipeline 101 exceeds the preset safety threshold due to formation feedback or pump abnormality, the high-pressure fracturing fluid will generate an upward thrust on the conical sealing column 3011. When the thrust is greater than the preload of the spring 3013, the conical sealing column 3011 is lifted up, causing the piston rod 3012 to slide upward along the piston cylinder 3015. The spring 3013 is compressed and shortened. At this time, an annular pressure relief channel is formed between the conical sealing column 3011 and the conical hole 2013, and the overpressured fracturing fluid quickly enters the interior of the pressure relief cylinder 2011.

[0043] The pressure relief cylinder 2011 is made of high-strength alloy material, which can withstand instantaneous overpressure impact. The connecting pipe 2021 on one side is connected to the conical hole 2013. The overpressured fracturing fluid flows to the one-way valve 2022 through the connecting pipe 2021. The one-way valve 2022 automatically opens under the action of fracturing fluid pressure, allowing the fracturing fluid to flow into the external recovery equipment through the recovery connector 2023. The recovery connector 2023 is compatible with the industry's common high-pressure interface and can be quickly connected to the recovery tank and filtration system to realize the directional collection of fracturing fluid and avoid the direct discharge of fracturing fluid, which would cause environmental pollution and waste of resources.

[0044] During this process, the surface of the conical sealing column 3011 is always in contact with the inner wall of the conical hole 2013 when it rises, which can effectively prevent fracturing fluid from entering the upper space of the pressure relief cylinder 2011, prevent fracturing fluid from contaminating the adjusting mechanism 302 components such as the sleeve 3014 and rack 3021, and ensure the stable operation of the subsequent adjustment function.

[0045] When the pressure inside the conveying pipeline 101 drops below the safety threshold, the upward thrust on the conical sealing column 3011 disappears, the compressed spring 3013 releases its elastic potential energy, and pushes the conical sealing column 3011 downward to reset, re-fitting tightly with the conical hole 2013 and closing the pressure relief channel. At the same time, the piston rod 3012 slides downward along the piston cylinder 3015, returning to the initial sealing position, and the entire device returns to the normal conveying state, reducing manual intervention, downtime and labor costs, and effectively improving work efficiency.

[0046] After the fracturing fluid pressure disappears, the one-way valve 2022 will automatically close under its own elastic force to prevent the fracturing fluid in the external recovery equipment from flowing back into the connecting pipe 2021 and the pressure relief cylinder 2011 due to reverse pressure. This avoids contaminating the fracturing fluid in the main pipeline of the delivery pipeline 101, ensures the purity of the subsequent fracturing fluid, and provides a guarantee for the reuse of the fracturing fluid after filtration and compounding, further strengthening the advantages of resource recycling in low-carbon mining.

[0047] To meet the needs of different well depths and fracturing fluid types, the pre-pressure of the sealing mechanism 301 can be adjusted by adjusting the mechanism 302, thereby changing the pressure relief trigger threshold. By rotating the handwheel 3023, the fixed shaft 3024 is rotated, which in turn drives the worm gear 3026 to rotate. The worm gear 3026 meshes with the worm wheel 3025, which in turn drives the gear 3022 to rotate. The gear 3022 meshes with the rack 3021. When the gear 3022 rotates, it drives the rack 3021 to move up and down, which in turn pushes the sleeve 3014 to slide up and down along the piston rod 3012. When the sleeve 3014 moves downward, the spring 3013 is further compressed, increasing the pre-pressure and raising the pressure relief trigger threshold, which can be adapted to high-pressure operation conditions in deep wells.

[0048] Conversely, when the sleeve 3014 moves upward, the spring 3013 relaxes, the pre-pressure decreases, and the pressure relief trigger threshold is lowered, making it suitable for shallow well low-pressure conditions. It can adapt to various fracturing conditions without replacing the sealing mechanism 301 component, which can reduce the frequency of equipment replacement and consumable consumption, reduce operating costs and resource waste, and at the same time improve the versatility of the device, making it suitable for low-carbon exploitation of different types of oil and gas wells.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fracturing wellhead device, comprising a main unit (100), including a delivery pipeline (101), an inlet valve (103) disposed on the delivery pipeline (101), and an inlet connector (102) disposed on the inlet valve (103), characterized in that, include, The pressure relief unit (200) includes a pressure relief mechanism (201) disposed on the delivery pipeline (101) and a recovery mechanism (202) disposed on the pressure relief mechanism (201). The recovery mechanism (202) can be used to recover the fracturing fluid leaked under the pressure relief state. The sealing unit (300) includes a sealing mechanism (301) disposed on the pressure relief mechanism (201) for switching the pressure relief mechanism (201), and an adjusting mechanism (302) disposed on the pressure relief mechanism (201), the adjusting mechanism (302) being used to adjust the pre-pressure of the sealing mechanism (301).

2. The fracturing wellhead device according to claim 1, characterized in that, The input end of the conveying pipeline (101) is fixedly connected to the output end of the oil inlet valve (103), and the input end of the oil inlet valve (103) is fixedly connected to the output end of the oil inlet connector (102).

3. The fracturing wellhead device according to claim 2, characterized in that, The pressure relief mechanism (201) includes a pressure relief cylinder (2011) fixedly connected to the top of the conveying pipe (101), a side fixing box (2012) fixedly connected to one side of the pressure relief cylinder (2011), and a tapered hole (2013) opened inside the pressure relief cylinder (2011).

4. The fracturing wellhead device according to claim 3, characterized in that, The recovery mechanism (202) includes a pressure relief cylinder (2011) with a connecting pipe (2021) fixedly connected to one side. The end of the connecting pipe (2021) near the pressure relief cylinder (2011) is connected to the conical hole (2013).

5. The fracturing wellhead device according to claim 4, characterized in that, A one-way valve (2022) is fixedly connected to the end of the connecting pipe (2021) away from the pressure relief cylinder (2011), and a recovery connector (2023) is fixedly connected to the output end of the one-way valve (2022).

6. The fracturing wellhead device according to claim 5, characterized in that, The sealing mechanism (301) includes a piston cylinder (3015) fixedly connected to the inner wall of the pressure relief cylinder (2011), a piston rod (3012) sleeved on the inner wall of the piston cylinder (3015), a conical sealing column (3011) fixedly connected to the bottom of the piston rod (3012), and the surface of the conical sealing column (3011) sleeved on the inner wall of the conical hole (2013).

7. The fracturing wellhead device according to claim 6, characterized in that, A sleeve plate (3014) is slidably connected to the surface of the piston rod (3012). The surface of the sleeve plate (3014) is fitted onto the inner wall of the pressure relief cylinder (2011). A spring (3013) is fixedly connected to the bottom of the sleeve plate (3014). The end of the spring (3013) away from the sleeve plate (3014) is fixedly connected to the top of the conical sealing column (3011).

8. The fracturing wellhead device according to claim 7, characterized in that, The adjusting mechanism (302) has a rack (3021) fixedly connected to one side of the sleeve plate (3014), and the surface of the rack (3021) is slidably connected to the inner wall of the side fixing box (2012).

9. The fracturing wellhead device according to claim 8, characterized in that, A gear (3022) is meshed on the side of the rack (3021) away from the sleeve plate (3014). The axial side of the gear (3022) is rotatably connected to the inner wall of the side fixing box (2012). A worm gear (3025) is fixedly connected to the other side of the gear (3022). A worm (3026) is meshed on the radial side of the worm gear (3025).

10. The fracturing wellhead device according to claim 9, characterized in that, A fixed shaft (3024) is fixedly connected to the inner wall of the worm gear (3026). One end of the fixed shaft (3024) is rotatably connected to the inner wall of the side fixing box (2012), and the other end of the fixed shaft (3024) rotates through the side fixing box (2012) and is fixedly connected to a handwheel (3023).

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