Fracturing wellhead device

Abstract

The invention belongs to the technical field of petroleum and natural gas extraction equipment, and provides a fracturing wellhead device which comprises a filtering mechanism; the backflow mechanism is mounted in the collecting cavity; and the sealing mechanisms are arranged in the valve body and the valve cover. The surface of the filter plate is cleaned through the brushes at the gas outlet end of the gas resource, gravel blocked on the side, close to the gas inlet end of the gas resource, of the filter plate can be cleaned, and the collection cover blocks the brushes, so that the cleaned gravel is slightly influenced by fluid drag force when the gas resource flows; the gravel can enter the collecting cover, so that gravel collection is achieved, it is avoided that the swept gravel is always in a suspended state under the action of fluid drag force of gas resources, it is avoided that the gravel cannot be collected, the phenomenon that the gravel is stacked together is avoided, and it is avoided that the airflow amount of the feeding pipe becomes small; and the conveying efficiency of gas resources is effectively prevented from being reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas extraction equipment, and particularly relates to a fracturing wellhead device. Background Art

[0002] In the modern oil extraction industry, as the difficulty of oil and gas resource extraction gradually increases, fracturing technology is widely used as an effective production-increasing measure. As the key hub of the fracturing operation, the reliability and stability of the performance of the fracturing wellhead device play a crucial role in the smooth progress of the entire extraction process.

[0003] Traditional fracturing wellhead devices expose many deficiencies when facing the increasingly high operating pressure requirements. There are several flat valves installed in the fracturing wellhead device. To ensure the purity of the gas resource, a filter plate is generally installed at the inlet end of the flat valve to filter out the sand carried in the gas resource. After the device operates for a long time, the filter plate may become clogged, thus affecting the normal transportation of the gas resource. To solve the above problems, the applicant retrieved a super-high-pressure fracturing sand control flat valve with a patent publication number of CN118881759B. Its main technical means is that the rotation of the fan is driven by the gas flow, and at the same time, the scraping rod is driven to scrape on the surface of the filter plate to achieve the effect of cleaning the surface of the filter plate, preventing sand from adhering to the surface of the filter plate and clogging the filter plate, which affects the gas transportation efficiency. While the scraping rod rotates, it will drive the sand to fall into the sand box through the through groove to collect the sand, preventing the internal sand from accumulating too much after the use of the through pipe for a long time and completely blocking the through pipe. Then, the sand box is disassembled and cleaned. After the applicant's analysis, the disadvantages of this technical solution are as follows: Although the scraping rod can achieve the effect of cleaning the surface of the filter plate, due to the continuous passage of the gas resource through the pipeline, the fluid drag force of the gas resource may cause the cleaned sand to be in a suspended state. Especially under a pressure of 210 MPa, the fluid drag force of the gas resource is greater. After a long time, the sand will accumulate together, resulting in a decrease in the gas flow rate that the pipeline can pass through, and thus affecting the gas transportation efficiency; in addition, the above solution is to clean the filter plate at the inlet end. When the scraping rod cleans the filter plate, due to the flow of the gas resource, the scraping rod has a tendency to bend towards the filter plate. At this time, the scraping rod will squeeze the sand blocked on the filter plate, causing the sand to block the filter holes on the filter plate more tightly, thereby increasing the difficulty of cleaning the sand and at the same time causing the degree of blockage of the filter plate to become more and more serious, thus reducing the gas transportation efficiency. Summary of the Invention

[0004] The purpose of the invention is to provide a fracturing wellhead device, aiming to solve the technical problem that the cleaning efficiency of the cleaning mechanism in the prior art is low, resulting in a reduction in the gas transportation efficiency.

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

[0006] A fracturing wellhead device includes a fracturing tree assembly and a tubing head assembly, as well as a number of flat valve bodies installed on the fracturing tree assembly and the tubing head assembly. The flat valve body includes a valve body, a valve seat, a feed pipe, a discharge pipe, a valve cover, a valve tail, a hydraulic component, a valve rod and a gate plate. The device further includes:

[0007] A filtering mechanism, the filtering mechanism includes a filter plate. An installation groove is formed on the inner wall of the feed pipe, and the filter plate is movably installed in the installation groove. A support rod is longitudinally fixed on the inner wall of the feed pipe, and a rotating rod is rotatably installed on the support rod. One end of the rotating rod passes through the filter plate and a number of brushes are arrayed and installed. The number of the brushes is located at the air inlet end of the feed pipe, and the brushes are in contact with the surface of the filter plate. A fan blade is installed at the end of the rotating rod away from the filter plate, and a number of collecting covers are also arrayed and installed on the periphery of the rotating rod. The collecting covers are close to the filter plate. A flow guiding cover is arranged at one end of the collecting cover close to the rotating rod, and the flow guiding cover is inserted on the surface of the rotating rod. A flow guiding cavity is formed in the rotating rod, and a number of flow guiding covers are communicated with the flow guiding cavity. A blanking hole is longitudinally formed in the support rod, and the blanking hole is communicated with the flow guiding cavity. A collecting cavity is formed in the pipe wall of the feed pipe, and the blanking hole is communicated with the collecting cavity;

[0008] A reflux mechanism, and a reflux mechanism is installed in the collecting cavity;

[0009] A sealing mechanism, and a sealing mechanism is installed in the valve body and the valve cover.

[0010] As a preference of the above technical solution, an air collecting cover is arranged on the outer side of the brush. The brush and the air collecting cover are located at the front end of the rotating direction of the collecting cover. An arc-shaped plate is arranged in the collecting cover, and the size of the arc-shaped plate decreases from the movable end to the fixed end of the collecting cover. An outer exhibition plate is arranged on one side of the collecting cover close to the front end of the rotating direction.

[0011] As a preference of the above technical solution, guiding plates are symmetrically arranged on the two side edges of the filter plate along the middle line. A number of guiding grooves matching the guiding plates are formed at the position of the installation groove in the feed pipe. An elastic member I is connected between the guiding plate and the guiding groove. A number of fixing blocks are annularly arrayed at the edge position of the filter plate close to the collecting cover. A dial is elastically rotatably installed at the movable end of the collecting cover. When the dial contacts the fixing block, the dial pushes the fixing block to make the filter plate rotate.

[0012] As a preference of the above technical solution, a return-shaped cavity is formed in the bottom rod wall of the support rod. A return-shaped hole is formed in the part between the feed pipe and the collecting cavity, and the return-shaped hole is communicated with the return-shaped cavity. A side air outlet pipe is arranged obliquely upward on one side of the support rod close to the filter plate, and the side air outlet pipe is communicated with the return-shaped cavity. The top of the support rod is connected with an upper air outlet pipe, and the upper air outlet pipe is communicated with the flow guiding cavity.

[0013] Preferably, as the above technical solution, the reflux mechanism includes:

[0014] An elastic telescopic rod, and the elastic telescopic rod is fixedly arranged in the collection cavity through a fixed rod;

[0015] A bowl-shaped cover, the top of the elastic telescopic rod is provided with the bowl-shaped cover, and the bowl-shaped cover is located directly below the blanking hole;

[0016] A plug, and the bottom of the collection cavity is provided with the plug.

[0017] Preferably, as the above technical solution, a connecting rod is arranged on the periphery of the movable end of the elastic telescopic rod, the other end of the connecting rod is fixed with a shaking plate, and the shaking plate is located below the elastic telescopic rod.

[0018] Preferably, as the above technical solution, the sealing mechanism includes:

[0019] A sealing plate, sealing grooves are formed in the inner walls of the feed pipe and the valve cover, the sealing plate is movably installed in the sealing grooves, the sealing plate is located between the filter plate and the gate plate, and a sealing cavity is formed between the sealing plate and the gate plate;

[0020] A movable plate, a movable groove is formed in the valve cover, the movable plate is movably installed in the movable groove, the movable groove is communicated with the sealing groove, a connecting plate is fixedly connected between the movable plate and the sealing plate, and a plurality of second elastic members are connected between the top of the movable plate and the top of the movable groove, and the plurality of second elastic members make the movable plate always tend to move towards the top of the movable groove;

[0021] A secondary toothed plate, a gear and a main toothed plate, a through hole is formed in the pipe wall of the valve cover, the through hole is communicated with the movable groove, the secondary toothed plate is fixedly connected with the movable plate through a connecting block, the secondary toothed plate blocks the through hole, a gear is rotatably installed in the valve cover, the secondary toothed plate meshes with the gear, and a main toothed plate is arranged on the periphery of the valve rod. When the main toothed plate contacts the gear, the main toothed plate meshes with the gear.

[0022] Preferably, as the above technical solution, after the gate plate moves upward to the closed state, the main toothed plate immediately meshes with the gear.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. In the present invention, several brushes are used to clean the surface of the filter plate at the air outlet end of the air resource. The gravel blocked on one side of the filter plate near the air inlet end of the air resource can be swept off. Since the collection hood blocks the brushes, the gravel swept off is less affected by the fluid drag force when the air resource flows, so that the gravel can enter the collection hood, thus realizing the collection of gravel, avoiding the gravel swept off being always in a suspended state under the action of the fluid drag force of the air resource, avoiding the gravel not being collected, avoiding the phenomenon of gravel piling up together, avoiding the reduction of the air flow rate in the feed pipe, and effectively avoiding the reduction of the conveying efficiency of the air resource.

[0025] 2. In the present invention, the brushes are used to clean the surface of the filter plate at the air outlet end of the air resource. This can effectively prevent the brushes from bending towards the filter plate under the action of the fluid drag force of the air resource, effectively preventing the brushes from squeezing the gravel blocked on the filter plate and avoiding the gravel being blocked more tightly in the filter holes of the filter plate, thereby reducing the degree of blockage of the filter plate, effectively avoiding the reduction of the conveying efficiency of the air resource, and at the same time reducing the difficulty of cleaning the gravel, improving the cleaning efficiency, ensuring the smoothness of the filter plate, and further effectively avoiding the reduction of the conveying efficiency of the air resource.

[0026] 3. In the present invention, part of the air resource is guided to the collection hood through the air collecting hood. With the assistance of the flow of the air resource, the gravel can quickly enter the collection hood and enter the diversion cavity under the guidance of the collection hood and the diversion hood. The gravel continues to flow with the air resource, and the air resource pushes the gravel into the blanking hole and drops into the collection cavity. This can improve the collection efficiency of the gravel, avoid the gravel being squeezed by the collection hood again and blocked on the filter plate when the collection hood rotates after entering the collection hood, thus ensuring the smoothness of the filter plate and further effectively avoiding the reduction of the conveying efficiency of the air resource. At the same time, the air resource can blow back the filter plate, so that some of the gravel blocked on the filter plate can be blown off, cooperating with the cleaning of the brushes. This reduces the difficulty of cleaning the gravel and also improves the cleaning efficiency of the blocked gravel, so that the filter plate remains smooth and effectively avoids the reduction of the conveying efficiency of the air resource.

[0027] 4. In the present invention, the sealing plate is closed after the gate plate is closed and the sealing plate is opened before the gate plate is opened. In this way, the sealing cavity between the gate plate and the sealing plate can store the air resource. After the sealing plate is opened, these air resources will flow towards the filter plate, thereby performing backwashing on the filter plate and washing off the gravel blocked on the filter plate, thus improving the cleaning efficiency of the gravel, ensuring the smoothness of the filter plate, and further effectively avoiding the reduction of the conveying efficiency of the air resource.

[0028] 5. In the present invention, a combined method of multiple high-performance sealing rings, such as upper metal sealing rings, lower metal sealing ring assemblies, and P-shaped sealing rings, is innovatively adopted on the fracturing tree assembly and the tubing head assembly, and gasket rings are reasonably arranged at key connection parts. This multi-level and all-round sealing design scheme can effectively block the leakage paths of various media in a high-pressure environment of 210 MPa, greatly enhancing the overall sealing performance of the device. Thus, it significantly reduces the risk of safety accidents caused by leakage, while reducing the unnecessary loss of oil and gas resources and potential pollution to the surrounding environment, providing a more reliable safety guarantee and environmental friendliness for oil extraction operations;

[0029] 6. In the present invention, from the overall structural layout to the material selection and design of each component of the fracturing tree assembly and the tubing head assembly, in-depth theoretical analysis and a large number of simulation experiments have been carried out. The overall structure of the device adopts an optimized mechanical structure design to ensure that the pressure can be evenly distributed on each component. At the same time, all components are made of high-quality materials with high strength, high pressure resistance, and good fatigue resistance, and are processed with advanced manufacturing processes to endow them with excellent pressure resistance. This enables the device to still maintain a stable physical structure and working performance when facing an extreme high pressure of 210 MPa, effectively reducing the frequent occurrence of failures caused by insufficient pressure resistance, strongly guaranteeing the continuity and efficiency of the fracturing operation, and reducing the high maintenance costs and production stagnation losses caused by equipment failures;

[0030] 7. In the present invention, the fracturing tree assembly and the tubing head assembly are equipped with various valves with different functions and simple operations, such as the quick cut-off function of the gate valve, the remote precise control ability of the flat valve, the fine flow regulation characteristics of the throttle valve, and the flexible switching performance of the square straight-through stop valve. The reasonable layout and ingenious design of these valves enable operators to easily and accurately adjust key parameters such as the flow rate and pressure of the fracturing fluid immediately and precisely according to the actual requirements of complex and changeable fracturing operations. This not only significantly improves the convenience and efficiency of operation, but also greatly reduces the work intensity and mental burden of operators, contributing to improving the quality and stability of the entire fracturing operation;

[0031] 8. In the present invention, a series of practical monitoring and maintenance components such as a dual-scale seismic pressure gauge, a metric and imperial dual-scale shock-resistant sulfur-proof pressure gauge, a grease injection valve, and a pressure relief screw assembly are ingeniously integrated into the fracturing tree assembly and the tubing head assembly. The pressure gauge can reflect the internal pressure changes of the device in real time and accurately, providing key operation parameter information for operators, facilitating the timely detection of potential pressure anomalies and taking corresponding measures. The reasonable setting of the grease injection valve and the pressure relief screw assembly provides great convenience for the daily maintenance of the equipment and the pressure release in emergency situations. Through regular grease injection maintenance operations, the good performance of the sealing components can be effectively guaranteed, and their service life can be extended; while when needed, a fast and safe pressure relief operation can timely resolve the safety risks brought by excessive pressure. These design features work together to effectively ensure the long-term stable operation of the device, significantly reduce the equipment maintenance cost and downtime, and improve the comprehensive utilization efficiency of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 is a schematic diagram of the structure of the flat valve body;

[0034] Figure 3 is a schematic diagram of the internal structure of the flat valve body;

[0035] Figure 4 is Figure 3 an enlarged schematic diagram of part A in

[0036] Figure 5 is a schematic diagram of the filter plate and the brush;

[0037] Figure 6 is a three-dimensional schematic diagram of the brush and the collection cover;

[0038] Figure 7 is a planar schematic diagram of the brush and the collection cover;

[0039] Figure 8 is a schematic diagram of the collection cover;

[0040] Figure 9 is a sectional schematic diagram of the collection cover;

[0041] Figure 10 is a sectional schematic diagram of the flat valve body;

[0042] Figure 11 is Figure 10 an enlarged schematic diagram of part C in

[0043] Figure 12 is Figure 3 an enlarged schematic diagram of part B in

[0044] In the figure:

[0045] 1. Fracturing tree assembly; 2. Tubing head assembly; 100. Flat valve body; 110. Valve body; 111. Valve seat; 120. Feed pipe; 121. Installation groove; 122. Collection chamber; 123. Return-shaped hole; 124. Sealing groove; 130. Discharge pipe; 140. Valve cover; 141. Movable groove; 142. Through hole; 150. Valve tail; 160. Hydraulic component; 161. Valve stem; 162. Gate plate; 200. Filter mechanism; 210. Filter plate; 211. Guide plate; 212. First elastic member; 213. Fixed block; 220. Support rod; 221. Feeding hole; 222. Upper air outlet pipe; 223. Return-shaped cavity; 224. Side air outlet pipe; 230. Rotating rod; 231. Diversion cavity; 240. Fan blade; 250. Brush; 251. Air collecting hood; 260. Collection hood; 261. Diversion hood; 262. Arc plate; 263. Outer exhibition plate; 264. Paddle; 300. Sealing mechanism; 310. Sealing plate; 320. Connecting plate; 330. Movable plate; 340. Second elastic member; 350. Slave gear plate; 360. Gear; 370. Master gear plate; 380. Sealing cavity; 390. Connecting block; 400. Return flow mechanism; 410. Elastic telescopic rod; 411. Fixed rod; 412. Connecting rod; 420. Bowl-shaped cover; 430. Jitter plate; 440. Plug. Detailed implementation manners

[0046] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0047] The following describes the specific implementation of the present invention in detail with reference to specific embodiments.

[0048] As Figures 1 - 11 shown, a fracturing wellhead device includes a fracturing tree assembly 1 and a tubing head assembly 2, and a plurality of flat valve bodies 100 installed on the fracturing tree assembly 1 and the tubing head assembly 2. The flat valve body 100 includes a valve body 110, a valve seat 111, a feed pipe 120, a discharge pipe 130, a valve cover 140, a valve tail 150, a hydraulic component 160, a valve stem 161 and a gate plate 162. The device further includes:

[0049] Filter mechanism 200, the filter mechanism 200 includes a filter plate 210. An installation groove 121 is formed on the inner wall of the feed pipe 120. The filter plate 210 is movably installed in the installation groove 121. A support rod 220 is longitudinally fixed on the inner wall of the feed pipe 120. A rotating rod 230 is rotatably installed on the support rod 220. One end of the rotating rod 230 passes through the filter plate 210 and a number of brush hairs 250 are arrayedly installed. The number of brush hairs 250 is located at the air inlet end of the feed pipe 120. The brush hairs 250 are in contact with the surface of the filter plate 210. A fan blade 240 is installed at the end of the rotating rod 230 away from the filter plate 210. A number of collection covers 260 are also arrayedly installed on the periphery of the rotating rod 230. The collection covers 260 are close to the filter plate 210. A diversion cover 261 is provided at one end of the collection cover 260 close to the rotating rod 230. The diversion cover 261 is inserted on the surface of the rotating rod 230. A diversion cavity 231 is formed in the rotating rod 230. The number of diversion covers 261 communicates with the diversion cavity 231. A blanking hole 221 is longitudinally formed in the support rod 220. The blanking hole 221 communicates with the diversion cavity 231. A collection cavity 122 is formed in the pipe wall of the feed pipe 120. The blanking hole 221 communicates with the collection cavity 122;

[0050] Return flow mechanism 400, a return flow mechanism 400 is installed in the collection cavity 122;

[0051] Sealing mechanism 300, a sealing mechanism 300 is installed in the valve body 110 and the valve cover 140.

[0052] In one case of this embodiment, the fracturing tree assembly 1 and the tubing head assembly 2 always operate under a rated working pressure of 210 MPa. The gas resource enters through the feed pipe 120 and is discharged through the discharge pipe 130. The gate plate 162 is driven by the hydraulic component 160 and the valve rod 161 to move up and down, so as to realize the opening and closing of the flat valve body 100; A bearing is provided on the part of the rotating rod 230 passing through the filter plate 210, so that the rotating rod 230 and the filter plate 210 can rotate relative to each other.

[0053] In practical application of this embodiment, gas resources enter the flat valve body 100 from the feed pipe 120. The sand carried in the gas resources is filtered by the filter plate 210. During the flow of the gas resources, the fan blades 240 are driven to rotate clockwise. The fan blades 240 drive the rotating rod 230 to rotate, and the rotating rod 230 drives a plurality of brushes 250 and a plurality of collection covers 260 to rotate. The plurality of brushes 250 clean the surface of the filter plate 210 at the gas outlet end of the gas resources, and can clean the sand blocked on one side of the filter plate 210 close to the gas inlet end of the gas resources. Since the collection cover 260 blocks the brushes 250, the sand swept down is less affected by the fluid drag force when the gas resources flow, so that the sand can enter the collection cover 260, thereby realizing the collection of sand, avoiding the sand swept down from being always in a suspended state under the action of the fluid drag force of the gas resources, avoiding the sand not being collected, avoiding the phenomenon of sand piling up together, avoiding the gas flow rate of the feed pipe 120 from becoming smaller, and effectively avoiding the reduction of the conveying efficiency of the gas resources;

[0054] The sand that enters the collection cover 260 enters the diversion cover 261 under the action of centrifugal force, enters the diversion cavity 231 in the rotating rod 230 through the diversion cover 261, and finally enters the collection cavity 122 through the blanking hole 221, thereby realizing the centralized collection of sand, avoiding the sand cleaned again from blocking the filter plate 210, ensuring the gas flow rate of the feed pipe 120, and effectively avoiding the reduction of the conveying efficiency of the gas resources;

[0055] The brushes 250 clean the surface of the filter plate 210 at the gas outlet end of the gas resources, which can effectively prevent the brushes 250 from bending towards the filter plate 210 under the action of the fluid drag force of the gas resources, effectively prevent the brushes 250 from squeezing the sand blocked on the filter plate 210, and avoid the sand blocking the filter holes on the filter plate 210 more tightly, thereby reducing the degree of blockage of the filter plate 210, effectively avoiding the reduction of the conveying efficiency of the gas resources, reducing the cleaning difficulty of the sand at the same time, improving the cleaning efficiency, ensuring the smoothness of the filter plate 210, and further effectively avoiding the reduction of the conveying efficiency of the gas resources.

[0056] Further, a wind collection cover 251 is arranged on the outer side of the brushes 250. The brushes 250 and the wind collection cover 251 are located at the front end in the rotation direction of the collection cover 260. An arc-shaped plate 262 is arranged in the collection cover 260. The size of the arc-shaped plate 262 decreases from the movable end to the fixed end of the collection cover 260. An outer exhibition plate 263 is arranged on one side of the collection cover 260 close to the front end in the rotation direction.

[0057] In one case of this embodiment, the wind collection cover 251 is arc-shaped and curved, or can be other structures that can guide the gas resources into the collection cover 260.

[0058] In actual application of this embodiment, after the brush 250 cleans the gravel blocking the filter plate 210, the collection cover 260 will immediately rotate to this position, thereby blocking the cleaned gravel and preventing the air resources from affecting the gravel from entering the collection cover 260. At the same time, part of the air resources flows into the wind collecting cover 251. Through the guidance of the wind collecting cover 251, part of the air resources may flow in the wind direction of the collection cover 260. In this way, with the assistance of the air resource flow, the gravel can quickly enter the collection cover. The sand and gravel are collected in the collecting cover 260 and enter the guide chamber 231 under the guidance of the collecting cover 260 and the guide cover 261. The sand and gravel continue to flow with the gas resources. The gas resources push the sand and gravel into the discharge hole 221 and drop it into the collecting chamber 122. In this way, the collection efficiency of the sand and gravel can be improved, and the sand and gravel can be prevented from being squeezed by the collecting cover 260 and blocked on the filter plate 210 again when the collecting cover 260 rotates after entering the collecting cover 260, thereby ensuring that the filter plate 210 is unobstructed, and further effectively preventing the reduction of the transportation efficiency of the gas resources;

[0059] After part of the gas resources enter the air collecting cover 251, under the guidance of the air collecting cover 251, part of the gas resources flow toward the collecting cover 260, so that the gas resources can back-blow the filter plate 210, so as to blow off part of the gravel blocking the filter plate 210, and cooperate with the cleaning of the brush 250, so as to reduce the difficulty of cleaning the gravel and improve the cleaning efficiency of the blocked gravel, so that the filter plate 210 remains unobstructed, and the transmission efficiency of the gas resources is effectively avoided.

[0060] The outward expansion plate 263 is expanded outward to guide the gravel, so that the gravel can enter the collection cover 260 more easily after being cleaned up, thereby improving the collection efficiency of the gravel, and then improving the cleaning efficiency of the gravel, and further effectively avoiding the reduction of the transportation efficiency of the gas resources.

[0061] Furthermore, guide plates 211 are symmetrically arranged on the edge positions of both sides of the filter plate 210 in a midline manner, a plurality of guide grooves matching the guide plates 211 are provided at the position of the mounting groove 121 in the feed pipe 120, an elastic member 212 is connected between the guide plate 211 and the guide groove, a plurality of fixed blocks 213 are arranged in a circular array at the edge position of the filter plate 210 close to the collecting cover 260, a paddle 264 is elastically rotatably installed on the movable end of the collecting cover 260, and when the paddle 264 contacts the fixed block 213, the paddle 264 pushes the fixed block 213 to rotate the filter plate 210.

[0062] In one case of the present embodiment, the elastic member 212 may be a spring or other elastically expandable member; the thickness of the paddle 264 is smaller than the distance between the fixed block 213 and the collecting cover 260, ensuring that the paddle 264 can pass under the fixed block 213 after rotation. In addition, a torsion spring may be provided at the elastically rotating part of the paddle 264, so that the paddle 264 always tends to maintain a vertical state with the collecting cover 260.

[0063] When the filter plate 210 is in a state of vibration, the filter plate 210 is in a state of being easily cleaned up, and the cleaning efficiency of the filter plate 210 is improved.

[0064] When the filter plate 210 rotates and then turns back immediately, the filter plate 210 will make a swinging motion, so that the cleaned gravel can be thrown toward the collecting cover 260. In conjunction with the rotation of the collecting cover 260, the gravel can enter the collecting cover 260 more easily, thus preventing the gravel from being suspended after being cleaned, thereby ensuring that the filter plate 210 is unobstructed, and further effectively preventing the reduction of the transportation efficiency of gas resources.

[0065] Furthermore, a toroidal cavity 223 is opened in the rod wall at the bottom of the support rod 220, and a toroidal hole 123 is opened in the part between the feed pipe 120 and the collecting chamber 122, and the toroidal hole 123 is connected with the toroidal cavity 223. A side air outlet pipe 224 is arranged obliquely upward on the side of the support rod 220 close to the filter plate 210, and the side air outlet pipe 224 is connected with the toroidal cavity 223. The top of the support rod 220 is connected with an upper air outlet pipe 222, and the upper air outlet pipe 222 is connected with the guide chamber 231.

[0066] It should be noted that since part of the gas resources follow the gravel into the collecting chamber 122, the pressure in the collecting chamber 122 will gradually increase, causing the gravel in the collecting chamber 122 to be in a state of disordered floating. This may cause the gas resources to drive the gravel to flow back toward the discharge hole 221, resulting in the subsequent gravel being unable to enter the collecting chamber 122, and at the same time, these gas resources cannot be discharged normally. For this reason, a corresponding structure is set to solve the above problem.

[0067] In practical application of this embodiment, due to the different densities of the gas resource and the gravel, when the gas resource enters the diversion cavity 231, part of the gas resource will be discharged from the upper gas outlet pipe 222 above the diversion cavity 231 and flow along with the gas resource entering from the feed pipe 120. Another part of the gas resource will enter the collection cavity 122, and this part of the gas resource will enter the loop cavity 223 through the loop hole 123 and finally be discharged from the side gas outlet pipe 224 and flow along with the gas resource entering from the feed pipe 120. In this way, the gravel backflow can be effectively avoided, preventing the gravel from not being able to enter the collection cavity 122 normally, ensuring the normal collection of the gravel, and at the same time ensuring the normal discharge of the gas resource.

[0068] Further, the reflux mechanism 400 includes:

[0069] An elastic telescopic rod 410, and the elastic telescopic rod 410 is fixedly arranged in the collection cavity 122 through a fixing rod 411;

[0070] A bowl-shaped cover 420, and the bowl-shaped cover 420 is arranged at the top of the elastic telescopic rod 410 and is located directly below the blanking hole 221;

[0071] A plug 440, and the plug 440 is arranged at the bottom of the collection cavity 122.

[0072] In practical application of this embodiment, when the gas resource enters the collection cavity 122 along with the gravel, the gas resource and the gravel will impact the bowl-shaped cover 420, causing the bowl-shaped cover 420 to move downward along with the elastic telescopic rod 410. Due to the instability of the gas resource entering the collection cavity 122, the elastic telescopic rod 410 will drive the bowl-shaped cover 420 to shake up and down. On the one hand, it makes the gravel fall to the bottom of the collection cavity 122. On the other hand, when the bowl-shaped cover 420 moves upward, it will push the gas resource into the loop hole 123 and be discharged from the side gas outlet pipe 224 through the loop cavity 223, thereby ensuring the normal discharge of the gas resource and the normal collection of the gravel.

[0073] Further, a connecting rod 412 is arranged on the outer periphery of the movable end of the elastic telescopic rod 410, and the other end of the connecting rod 412 is fixed with a shaking plate 430, and the shaking plate 430 is located below the elastic telescopic rod 410.

[0074] In practical application of this embodiment, while the elastic telescopic rod 410 moves up and down, the connecting rod 412 drives the shaking plate 430 to shake up and down. In this way, the gravel in the collection cavity 122 can be shaken, making the gravel evenly distributed in the collection cavity 122, avoiding the rapid blockage of the inlet of the collection cavity 122 due to the accumulation of gravel in one place, ensuring the normal collection of the gravel. When the fracturing wellhead device stops operating, the gravel can be discharged by opening the plug 440.

[0075] Such as Figure 3 、Figure 10 and Figure 12 As shown in and

[0076] , the sealing mechanism 300 includes:

[0076] A sealing plate 310 is provided. Sealing grooves 124 are formed on the inner walls of the feed pipe 120 and the valve cover 140. The sealing plate 310 is movably installed in the sealing grooves 124. The sealing plate 310 is located between the filter plate 210 and the gate plate 162, and a sealing cavity 380 is formed between the sealing plate 310 and the gate plate 162;

[0077] A movable plate 330 is provided. A movable groove 141 is formed in the valve cover 140. The movable plate 330 is movably installed in the movable groove 141. The movable groove 141 communicates with the sealing groove 124. A connecting plate 320 is fixedly connected between the movable plate 330 and the sealing plate 310. A plurality of second elastic members 340 are connected between the top of the movable plate 330 and the top of the movable groove 141. The plurality of second elastic members 340 always tend to move the movable plate 330 towards the top of the movable groove 141;

[0078] A slave rack 350, a gear 360 and a main rack 370 are provided. A through hole 142 is formed in the pipe wall of the valve cover 140. The through hole 142 communicates with the movable groove 141. The slave rack 350 is fixedly connected to the movable plate 330 through a connecting block 390. The slave rack 350 blocks the through hole 142. A gear 360 is rotatably installed in the valve cover 140. The slave rack 350 meshes with the gear 360. A main rack 370 is disposed around the valve rod 161. When the main rack 370 contacts the gear 360, the main rack 370 meshes with the gear 360.

[0079] Further, after the gate plate 162 moves upward to the closed state, the main rack 370 immediately meshes with the gear 360.

[0080] In one case of this embodiment, the gate plate 162 is rectangular, so as to ensure that when the gate plate 162 moves up and down, air resources will not enter the valve cover 140 or the valve tail 150; the second elastic member 340 can be a spring or other components that can elastically stretch and contract. The second elastic member 340 ensures that the sealing plate 310 is in the open state when the main rack 370 does not contact the gear 360; among them, when the gate plate 162 is in the open state, there is a moving distance between the main rack 370 and the gear 360, and this distance ensures that the sealing plate 310 closes only after the gate plate 162 is closed.

[0081] In actual application of this embodiment, when the flat valve body 100 stops running, that is, the gate 162 is closed. During this process, the gate 162 moves upward. The upward movement of the gate 162 causes the main tooth plate 370 to move upward and approach the gear 360. When the gate 162 is in the closed state, the main tooth plate 370 contacts the gear 360 and causes the gear 360 to rotate. The rotation of the gear 360 drives the secondary tooth plate 350 to move downward. When the secondary tooth plate 350 moves downward, it drives the movable plate 330 to move downward through the connecting block 390. When the movable plate 330 moves downward, it drives the sealing plate 310 to move downward through the connecting plate 320 and enter the sealing groove 124 to make the feed pipe 120 in the closed state. At this time, a sealing cavity 380 is formed between the sealing plate 310 and the gate 162. After the gate 162 is closed, the gas resource is intercepted by the gate 162. When the sealing plate 310 is closed, part of the gas resource is stored in the sealing cavity 380. When the flat valve body 100 needs to be used continuously, the gate 162 moves downward. When the gate 162 moves downward, the sealing plate 310 moves upward. Before the gate 162 is in the open state, the sealing plate 310 is fully opened. In this way, the gas resource in the sealing cavity 380 will flow toward the filter plate 210, thereby performing backwashing on the filter plate 210, flushing the blocked gravel on the filter plate 210, thereby improving the cleaning efficiency of the gravel, ensuring the smoothness of the filter plate 210, and further effectively avoiding the reduction of the gas resource transportation efficiency.

[0082] As Figure 1As shown, in the fracturing tree assembly 1, the main structure of the fracturing tree assembly 1 uses a four-way forged from high-strength alloy material as the core hub, which has excellent compressive and impact resistance performance, can evenly disperse the huge pressure brought by high-pressure fluid, effectively avoid the occurrence of stress concentration phenomenon, and provide a solid foundation for the stable operation of the entire fracturing tree assembly 1; the grease injection valves on the fracturing tree assembly 1 and the tubing head assembly 2 adopt an advanced seal structure design to ensure that lubricating grease can be accurately injected into the sealed part under high-pressure environment to maintain the sealing performance, and its operation is simple and easy to maintain. The flange connection parts of the fracturing tree assembly 1 and the tubing head assembly 2 are processed through special processing technology, and the surface flatness and roughness reach extremely high standards. With the tight connection of high-precision gasket rings, stud bolts and nuts, a reliable sealed connection node is formed, effectively preventing the leakage of high-pressure medium; the gate valves, the body 100 of the flat valve and the throttle valve on the fracturing tree assembly 1 are all selected with high-quality sealing materials and wear-resistant valve cores, which not only have excellent sealing performance, but also have flexible and reliable opening and closing actions, can achieve rapid cut-off and precise flow regulation, and meet the operation requirements under different working conditions; the design of the instrument flange on the fracturing tree assembly 1 fully considers the convenience and stability of instrument installation, ensures that the double-scale shock-resistant pressure gauge on the instrument flange can accurately measure and display the system pressure, provides key operation parameter information for operators, and its shock-resistant performance effectively guarantees the normal operation and data accuracy of the instrument in the strong vibration environment of fracturing operations; the dimensional accuracy and thread quality of the double-male short joint and the threaded flange at the throttle valve are strictly controlled to ensure that the connection between each component is tight and firm, and is convenient for installation and disassembly, improving the assembly and maintenance efficiency of the device;

[0083] In the tubing head assembly 2, the tubing cross-over body connected to the fracturing tree assembly 1 adopts a unique streamline design. The internal channel is smooth and can effectively reduce fluid resistance, reduce pressure loss, and at the same time enhance the structural strength of the body, making it more stable and reliable when withstanding high pressure. The combined sealing structure of the upper metal sealing ring, lower metal sealing ring assembly and P-type sealing ring at the tubing port of the tubing head assembly 2 has been optimized for the special requirements of tubing hanging and high-pressure sealing. It can form a multi-level and all-round sealing barrier between the tubing and the cross-over body, effectively prevent oil and gas leakage, and ensure the safety of the wellhead device. The jackscrew assembly composed of the jackscrew body, jackscrew support ring, jackscrew packing, jackscrew retaining ring and jackscrew cap at the tubing hanger assembly is made of high-strength and corrosion-resistant materials and has an accurate thread adjustment function. It can firmly fix the tubing hanger assembly and maintain a stable tightening force during long-term use to prevent tubing displacement. The layout of the grease injection valve and pressure relief screw assembly at the P-type sealing ring in the tubing head assembly 2 is reasonable, convenient for operation and maintenance, and provides convenient conditions for the maintenance of the sealing components and the pressure control of the system. The metric and imperial dual-scale shock-resistant and sulfur-resistant pressure gauge on the instrument flange of the tubing head assembly 2 can adapt to complex oil and gas environments, accurately monitor the internal pressure changes of the tubing head, provide reliable pressure data for operators, and ensure the safety of operations.

[0084] The foregoing has shown and described 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 by the above embodiments. The above embodiments and the descriptions in the specification are only used to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A fracturing wellhead device, comprising a fracturing tree assembly (1) and a tubing head assembly (2), and a plurality of flat valve bodies (100) mounted on the fracturing tree assembly (1) and the tubing head assembly (2), wherein the flat valve body (100) comprises a valve body (110), a valve seat (111), a feed pipe (120), a discharge pipe (130), a valve cover (140), a valve tail (150), a hydraulic assembly (160), a valve stem (161) and a gate (162), characterized in that: The device also includes: A filtering mechanism (200), the filtering mechanism (200) comprising a filter plate (210), a mounting groove (121) being provided on the inner wall of the feed pipe (120), the filter plate (210) being movably mounted in the mounting groove (121), a support rod (220) being longitudinally fixed on the inner wall of the feed pipe (120), a rotating rod (230) being rotatably mounted on the support rod (220), one end of the rotating rod (230) passing through the filter plate (210) and having a plurality of brushes (250) mounted in an array, the plurality of brushes (250) being located at the air inlet end of the feed pipe (120), the brushes (250) being in contact with the surface of the filter plate (210), and a fan blade (240) being mounted on one end of the rotating rod (230) away from the filter plate (210). 0), a plurality of collecting covers (260) are also arranged in an array on the periphery of the rotating rod (230), the collecting cover (260) is close to the filter plate (210), a flow guide cover (261) is arranged on one end of the collecting cover (260) close to the rotating rod (230), the flow guide cover (261) is plugged into the surface of the rotating rod (230), a flow guide cavity (231) is provided in the rotating rod (230), a plurality of flow guide covers (261) are connected to the flow guide cavity (231), a material discharge hole (221) is longitudinally provided in the supporting rod (220), the material discharge hole (221) is connected to the flow guide cavity (231), a collecting cavity (122) is provided in the wall of the feeding pipe (120), the material discharge hole (221) is connected to the collecting cavity (122); A reflux mechanism (400), wherein the collection chamber (122) is provided with a reflux mechanism (400); A sealing mechanism (300) is installed in the valve body (110) and the valve cover (140).

2. The fracturing wellhead device according to claim 1, characterized in that: An air collecting hood (251) is arranged on the outer side of the brush (250); the brush (250) and the air collecting hood (251) are located at the front end of the collection hood (260) in the rotation direction; an arc plate (262) is arranged inside the collection hood (260); the size of the arc plate (262 decreases from the movable end of the collection hood (260) to the fixed end of the collection hood (260); and an extension plate (263) is arranged on one side of the collection hood (260) close to the front end in the rotation direction.

3. The fracturing wellhead device according to claim 1, characterized in that: Guide plates (211) are symmetrically arranged at the midline of both side edges of the filter plate (210); a plurality of guide grooves matching the guide plates (211) are provided at the position of the mounting groove (121) in the feed pipe (120); an elastic member (212) is connected between the guide plate (211) and the guide groove; a plurality of fixing blocks (213) are arranged in a ring array at the edge of the filter plate (210) close to the collecting cover (260); a paddle (264) is elastically rotatably installed at the movable end of the collecting cover (260); when the paddle (264) contacts the fixing block (213), the paddle (264) pushes the fixing block (213) to rotate the filter plate (210).

4. The fracturing wellhead device according to claim 1, characterized in that: A circular cavity (223) is provided in the rod wall at the bottom of the support rod (220); a circular hole (123) is provided in the portion between the feed pipe (120) and the collection chamber (122); the circular hole (123) is communicated with the circular cavity (223); a side air outlet pipe (224) is provided obliquely upward on the side of the support rod (220) close to the filter plate (210); the side air outlet pipe (224) is communicated with the circular cavity (223); an upper air outlet pipe (222) is connected to the top of the support rod (220); and the upper air outlet pipe (222) is communicated with the guide chamber (231).

5. The fracturing wellhead device according to claim 4, characterized in that: The reflux mechanism (400) comprises: An elastic telescopic rod (410), wherein the elastic telescopic rod (410) is fixedly arranged in the collecting chamber (122) via a fixing rod (411); A bowl-shaped cover (420), wherein the top of the elastic telescopic rod (410) is provided with a bowl-shaped cover (420), and the bowl-shaped cover (420) is located directly below the feeding hole (221); A plug (440), a plug (440) is provided at the bottom of the collecting chamber (122).

6. The fracturing wellhead device according to claim 5, characterized in that: A connecting rod (412) is arranged on the periphery of the movable end of the elastic telescopic rod (410), and a shaking plate (430) is fixed to the other end of the connecting rod (412), and the shaking plate (430) is located below the elastic telescopic rod (410).

7. The fracturing wellhead device according to claim 1, characterized in that: The sealing mechanism (300) comprises: A sealing plate (310), wherein the inner walls of the feed pipe (120) and the valve cover (140) are provided with a sealing groove (124), and the sealing plate (310) is movably installed in the sealing groove (124). The sealing plate (310) is located between the filter plate (210) and the gate plate (162), and a sealing cavity (380) is formed between the sealing plate (310) and the gate plate (162); A movable plate (330), wherein a movable groove (141) is provided in the valve cover (140), wherein the movable plate (330) is movably installed in the movable groove (141), wherein the movable groove (141) is communicated with the sealing groove (124), wherein a connecting plate (320) is fixedly connected between the movable plate (330) and the sealing plate (310), wherein a plurality of elastic members (340) are connected between the top of the movable plate (330) and the top of the movable groove (141), wherein the plurality of elastic members (340) ensure that the movable plate (330) always has a tendency to move toward the top of the movable groove (141); A slave tooth plate (350), a gear (360) and a main tooth plate (370); a through hole (142) is opened on the tube wall of the valve cover (140); the through hole (142) is communicated with the movable groove (141); the slave tooth plate (350) is fixedly connected to the movable plate (330) through a connecting block (390); the slave tooth plate (350) blocks the through hole (142); a gear (360) is rotatably installed in the valve cover (140); the slave tooth plate (350) and the gear (360) are meshed with each other; a main tooth plate (370) is arranged on the periphery of the valve stem (161); when the main tooth plate (370) and the gear (360) are in contact, the main tooth plate (370) and the gear (360) are meshed with each other.

8. The fracturing wellhead device according to claim 7, characterized in that: When the gate plate (162) moves upward and is in a closed state, the main tooth plate (370) immediately meshes with the gear (360).

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