A multifunctional fracturing wellhead device

Abstract

The present invention provides a multifunctional fracturing wellhead device, which relates to the technical field of wellhead devices, including a main transmission pipe, a fracturing fluid input pipe is arranged on the side wall of the main transmission pipe, a transition pipe is arranged at one end of the fracturing fluid input pipe away from the main transmission pipe, a filter box is arranged at the lower end of the transition pipe, a partition is arranged in the filter box, the partition divides the inside of the filter box into a liquid inlet chamber and a liquid outlet chamber, a plurality of through holes are arranged horizontally in the partition, a circular sand filter is arranged horizontally in the through hole, a part of the circular sand filter is located in the liquid inlet chamber, and another part of the circular sand filter is located in the liquid outlet chamber, a liquid inlet and a liquid outlet are arranged at the upper end of the filter box, and a fracturing fluid inlet pipe and a liquid outlet pipe are arranged at the lower end of the filter box. In the present invention, the fracturing fluid can be filtered by the circular sand filter, thereby reducing the sand and gravel in the fracturing fluid, and the filtered fracturing fluid flows into the main transmission pipe through the fracturing fluid input pipe, thereby reducing the erosion of the inner wall of the main transmission pipe by the fracturing fluid, and extending the service life of the fracturing wellhead device as a whole.

Description

Technical Field

[0001] The invention relates to the technical field of wellhead devices, and in particular to a multifunctional fracturing wellhead device. Background Art

[0002] The fracturing wellhead device is an important equipment combination used in oil and gas well fracturing construction. Its main function is to safely and effectively transport high-pressure liquid on the ground to the formation to achieve the purpose of reservoir fracturing.

[0003] For example, a Chinese patent with authorization announcement number CN116398078B discloses a fracturing wellhead with a high-pressure resistant structure, which relates to the field of oil extraction equipment, including a main transmission pipe and a flow chamber, wherein the flow chamber runs through the main transmission pipe, and the main transmission pipe is provided with a buffer mechanism and an energy absorption mechanism, wherein the buffer mechanism includes a folded ear and an elastic tongue, and the energy absorption mechanism includes a sealing ring, a non-Newtonian fluid and a silica gel bag. The fracturing wellhead with a high-pressure resistant structure of the embodiment of the present application utilizes the excellent energy absorption and damping effect of the non-Newtonian fluid to absorb and buffer the suddenly increased fracturing fluid pressure to prevent pressure rebound, and at the same time enhances the buffering telescopic stroke of the non-Newtonian fluid through the silica gel bag, thereby increasing the energy absorption stroke of the non-Newtonian fluid, thereby increasing the energy absorption efficiency, and making the fracturing fluid pressure quickly stabilize.

[0004] However, during the fracturing process, the fracturing fluid contains a large amount of sand and gravel. The high-speed flowing fracturing fluid will carry the sand and gravel to erode the inner wall of the fracturing wellhead, shortening the service life of the fracturing wellhead. Summary of the invention

[0005] The invention provides a multifunctional fracturing wellhead device, which is used to solve the technical problem that the existing high-speed flowing fracturing fluid may carry sand and gravel to erode the inner wall of the fracturing wellhead, thereby shortening the service life of the fracturing wellhead.

[0006] In order to solve the above technical problems, the present invention discloses a multifunctional fracturing wellhead device, comprising: a main transmission pipe, a fracturing fluid input pipe is arranged on the side wall of the main transmission pipe, a first valve is arranged on the fracturing fluid input pipe, a transition pipe is arranged at one end of the fracturing fluid input pipe away from the main transmission pipe, a filter box is arranged at the lower end of the transition pipe, a partition is arranged in the filter box, the partition divides the interior of the filter box into a liquid inlet chamber and a liquid outlet chamber, a plurality of through holes are horizontally arranged in the partition, a circular sand filter net is horizontally arranged in the through hole, a part of the circular sand filter net is located in the liquid inlet chamber, and the other part of the circular sand filter net is located in the liquid outlet chamber, a liquid inlet and a liquid outlet are respectively arranged at the upper end of the filter box, one end of the liquid inlet is communicated with the interior of the liquid inlet chamber, the other end of the liquid inlet is communicated with the interior of the transition pipe, one end of the liquid outlet is communicated with the interior of the liquid outlet chamber, the other end of the liquid outlet is communicated with the interior of the transition pipe, a second valve is arranged in the liquid outlet, a fracturing fluid inlet pipe and a liquid outlet pipe are respectively arranged at the lower end of the filter box, one end of the fracturing fluid inlet pipe is communicated with the interior of the liquid inlet chamber, and one end of the liquid outlet pipe is communicated with the interior of the liquid outlet chamber.

[0007] Preferably, a cavity is provided in the partition, and a first rotating shaft is vertically provided in the cavity. The first rotating shaft is fixedly connected to the center of the circular sand filter net, the upper end of the first rotating shaft is rotatably connected to the top wall of the filter box, the lower end of the first rotating shaft extends to the outside of the filter box and is connected to the output end of the first motor, and the first motor is provided at the bottom of the filter box.

[0008] Preferably, the diameter of the circular sand filter screen is smaller than the diameter of the inner wall of the filter box, and a plurality of limit plates are arranged inside the liquid inlet chamber. The limit plates correspond to the circular sand filter screens one by one, and the limit plates are arc-shaped. A limit groove is arranged on the side of the limit plate close to the circular sand filter screen. The outer periphery of the circular sand filter screen is slidably connected to the inner wall of the limit groove, and the limit plate is connected to the inner wall of the liquid inlet chamber on the side away from the circular sand filter screen.

[0009] Preferably, a plurality of guide plates are arranged in the liquid outlet cavity, the guide plates correspond to the circular sand filter nets one by one, and the guide plates and the circular sand filter nets are arranged at intervals.

[0010] Preferably, the guide plate is semicircular, the arc side of the guide plate is connected to the inner wall of the liquid outlet cavity, and a gap is provided between the straight side of the guide plate and the partition plate.

[0011] Preferably, a collecting box is provided in the transition pipe, and the lower end of the collecting box is connected to the upper end of the filter box. The collecting box is located between the liquid inlet and the liquid outlet, and the front and rear outer walls of the collecting box are respectively connected to the front and rear inner walls of the transition pipe. A drain pipe is provided at the lower position of the front side wall of the collecting box, and one end of the drain pipe is connected to the interior of the collecting box, and the other end of the drain pipe extends to the outside of the transition pipe and is provided with a drain valve. A sand retaining mechanism is provided above the collecting box, a first sealing mechanism is provided at the upper left end of the collecting box, and a second sealing mechanism is provided at the upper right end of the collecting box.

[0012] Preferably, the sand retaining mechanism includes a horizontally arranged second rotating shaft, wherein the front and rear ends of the second rotating shaft are respectively rotatably connected to the front and rear inner walls of the transition tube, a second motor is arranged on the front outer wall of the transition tube, and the output end of the second motor is connected to the front end of the second rotating shaft, a rotating cylinder is arranged outside the second rotating shaft, the rotating cylinder is concentrically arranged with the second rotating shaft, the center of the rotating cylinder is connected to the outer wall of the second rotating shaft, the upper end of the transition tube is arranged in an arc shape and is coaxially arranged with the rotating cylinder, the front and rear side walls of the rotating cylinder are respectively slidably connected to the front and rear inner walls of the transition tube, a plurality of sand suction plates are arranged on the outer wall of the rotating cylinder, the sand suction plates are made of elastic material, and the plurality of sand suction plates are distributed in a circular array about the central axis of the rotating cylinder, and the sand suction plate is arranged in a hemispherical shape at one end away from the rotating cylinder, and the sand suction plate contacts the inner wall of the upper end of the transition tube at one end away from the rotating cylinder.

[0013] Preferably, the first sealing mechanism includes a sliding hole arranged in the left side wall of the collecting box, the upper end of the sliding hole is connected to the interior of the transition pipe, a sliding plate is slidably arranged in the sliding hole, a guide slope is arranged on the left side wall of the upper end of the sliding plate, a compression spring is arranged at the lower end of the sliding plate, one end of the compression spring is connected to the sliding plate, and the other end of the compression spring is connected to the bottom wall of the sliding hole.

[0014] Preferably, the second sealing mechanism includes a fixed plate, which is arranged at the upper end of the right side wall of the collecting box, and a third rotating shaft is arranged on the right side of the fixed plate. The front and rear ends of the third rotating shaft are respectively rotatably connected to the front and rear inner walls of the transition pipe, and a torsion spring is arranged on the third rotating shaft. One end of the torsion spring is connected to the third rotating shaft, and the other end of the torsion spring is connected to the upper end of the collecting box. A sealing plate is arranged on the third rotating shaft, and the front and rear side walls of the sealing plate are respectively slidably connected to the front and rear inner walls of the transition pipe.

[0015] Preferably, a blocking rod is arranged between the rotating cylinder and the collecting box, and the front and rear ends of the blocking rod are respectively connected to the front and rear inner walls of the transition pipe.

[0016] The technical solution of the present invention has the following advantages: the present invention provides a multifunctional fracturing wellhead device, which relates to the technical field of wellhead devices, including a main transmission pipe, a fracturing fluid input pipe is arranged on the side wall of the main transmission pipe, a first valve is arranged on the fracturing fluid input pipe, a transition pipe is arranged at one end of the fracturing fluid input pipe away from the main transmission pipe, a filter box is arranged at the lower end of the transition pipe, a partition is arranged in the filter box, the partition divides the inside of the filter box into a liquid inlet chamber and a liquid outlet chamber, a plurality of through holes are arranged horizontally in the partition, a circular sand filter is arranged horizontally in the through holes, A part of the circular sand filter is located in the liquid inlet cavity, and another part of the circular sand filter is located in the liquid outlet cavity. A liquid inlet and a liquid outlet are respectively arranged at the upper end of the filter box. One end of the liquid inlet is connected to the inside of the liquid inlet cavity, and the other end of the liquid inlet is connected to the inside of the transition pipe. One end of the liquid outlet is connected to the inside of the liquid outlet cavity, and the other end of the liquid outlet is connected to the inside of the transition pipe. A second valve is arranged in the liquid outlet. A fracturing fluid inlet pipe and a liquid outlet pipe are respectively arranged at the lower end of the filter box. One end of the fracturing fluid inlet pipe is connected to the inside of the liquid inlet cavity, and one end of the liquid outlet pipe is connected to the inside of the liquid outlet cavity. In the present invention, the fracturing fluid can be filtered by the circular sand filter, thereby reducing the sand and gravel in the fracturing fluid. The filtered fracturing fluid flows into the main transmission pipe through the fracturing fluid input pipe, thereby reducing the erosion of the inner wall of the main transmission pipe by the fracturing fluid, and extending the service life of the whole fracturing wellhead device.

[0017] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the devices particularly pointed out in the written description and the drawings of the description.

[0018] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1This is a schematic diagram of the overall structure of a multifunctional fracturing wellhead device of the present invention;

[0021] Figure 2 It is a schematic diagram of the internal structure of the transition pipe and the filter box in the present invention;

[0022] Figure 3 For the present invention Figure 2 Partial cross-sectional view at AA in the middle;

[0023] Figure 4 For the present invention Figure 2 A magnified view of the structure at B in the middle;

[0024] Figure 5 For the present invention Figure 2 A magnified view of the structure at C in the middle;

[0025] Figure 6 For the present invention Figure 2 Enlarged view of the structure at point D in the middle.

[0026] In the figure: 1. main transmission pipe; 2. fracturing fluid input pipeline; 3. first valve; 4. transition pipe; 5. filter box; 6. partition; 7. liquid inlet chamber; 8. liquid outlet chamber; 9. circular sand filter; 10. liquid inlet; 11. liquid outlet; 12. fracturing fluid inlet pipe; 13. liquid outlet pipe; 14. first rotating shaft; 15. first motor; 16. limit plate; 17. guide plate; 18. collecting box; 19. sewage pipe; 20. second rotating shaft; 21. second motor; 22. rotating cylinder; 23. sand suction plate; 24. sliding hole; 25. sliding plate; 26. compression spring; 27. fixed plate; 28. third rotating shaft; 29. ​​torsion spring; 30. sealing plate; 31. blocking rod. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0028] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] Example 1

[0030] The embodiment of the present invention provides a multifunctional fracturing wellhead device, such as Figure 1-Figure 6 As shown, it comprises: a main transmission pipe 1, a fracturing fluid input pipe 2 is arranged on the side wall of the main transmission pipe 1, a first valve 3 is arranged on the fracturing fluid input pipe 2, a transition pipe 4 is arranged at one end of the fracturing fluid input pipe 2 away from the main transmission pipe 1, a filter box 5 is arranged at the lower end of the transition pipe 4, a partition 6 is arranged in the filter box 5, the partition 6 divides the inside of the filter box 5 into a liquid inlet chamber 7 and a liquid outlet chamber 8, a plurality of through holes are horizontally arranged in the partition 6, a circular sand filter screen 9 is horizontally arranged in the through hole, a part of the circular sand filter screen 9 is located in the liquid inlet chamber 7, and another part of the circular sand filter screen 9 is located in the liquid inlet chamber 7. In the liquid outlet cavity 8, a liquid inlet 10 and a liquid outlet 11 are respectively arranged at the upper end of the filter box 5, one end of the liquid inlet 10 is connected to the interior of the liquid inlet cavity 7, and the other end of the liquid inlet 10 is connected to the interior of the transition pipe 4, one end of the liquid outlet 11 is connected to the interior of the liquid outlet cavity 8, and the other end of the liquid outlet 11 is connected to the interior of the transition pipe 4, and a second valve is arranged in the liquid outlet 11, and a fracturing fluid inlet pipe 12 and a liquid outlet pipe 13 are respectively arranged at the lower end of the filter box 5, one end of the fracturing fluid inlet pipe 12 is connected to the interior of the liquid inlet cavity 7, and one end of the liquid outlet pipe 13 is connected to the interior of the liquid outlet cavity 8.

[0031] The working principle and beneficial effects of the above technical solution are as follows: a partition 6 is arranged in the filter box 5, and the partition 6 can divide the interior of the filter box 5 into a liquid inlet chamber 7 and a liquid outlet chamber 8. A plurality of through holes are arranged at equal intervals on the partition 6, and the through holes penetrate the left and right side walls of the partition 6, and the through holes are in the shape of long strips. A circular sand filter mesh 9 is arranged in the through hole, and the circular sand filter mesh 9 is used to filter the fracturing fluid. When in use, the fracturing fluid flows into the liquid inlet chamber 7 through the fracturing fluid inlet pipe 12, and then the fracturing fluid passes through a plurality of circular sand filter meshes 9 in sequence, and the sand and gravel in the fracturing fluid are filtered by the circular sand filter meshes 9. The filtered fracturing fluid flows into the transition pipe 4 through the liquid inlet 10. At this time, the first valve 3 is opened and the second valve is closed, and the filtered fracturing fluid can flow into the main transmission pipe 1 through the fracturing fluid input pipe. After the preset fracturing time, the first valve 3 is closed and the second valve is opened, and the fracturing fluid in the transition pipe 4 can flow into the liquid outlet chamber 8 through the liquid outlet 11, and then be discharged to the outside of the filter box 5 through the liquid outlet pipe 13. In the present invention, the fracturing fluid can be filtered through the circular sand filter 9, reducing the sand and gravel in the fracturing fluid. The filtered fracturing fluid flows into the main transmission pipe 1 through the fracturing fluid input pipeline 2, reducing the erosion of the inner wall of the main transmission pipe 1 by the fracturing fluid, and extending the overall service life of the fracturing wellhead device.

[0032] Example 2

[0033] On the basis of the above-mentioned embodiment 1, Figure 2As shown, a cavity is set in the partition 6, and a first rotating shaft 14 is vertically set in the cavity. The first rotating shaft 14 is fixedly connected to the center of the circular sand filter net 9, and the upper end of the first rotating shaft 14 is rotatably connected to the top wall of the filter box 5. The lower end of the first rotating shaft 14 extends to the outside of the filter box 5 and is connected to the output end of the first motor 15. The first motor 15 is arranged at the bottom of the filter box 5.

[0034] The working principle and beneficial effects of the above technical solution are as follows: when the first valve 3 is opened and the second valve is closed, the circular sand filter screen 9 in the liquid inlet chamber 7 will gradually become blocked due to the sand and gravel being blocked all the time, thereby affecting the flow rate of the fracturing fluid. At this time, the first motor 15 is started, and the first motor 15 rotates to drive the first rotating shaft 14 to rotate. When the first rotating shaft 14 rotates, it can drive the circular sand filter screen 9 to rotate in the filter box 5. The part of the circular sand filter screen 9 located in the liquid inlet chamber 7 gradually rotates into the liquid outlet chamber 8, and the part of the circular sand filter screen 9 in the liquid outlet chamber 8 gradually rotates into the liquid inlet chamber 7. The circular sand filter screen 9 in the liquid outlet chamber 8 can ensure the smooth passage of the fracturing fluid, thereby ensuring the flow rate of the fracturing fluid. After the fracturing fluid stops entering, the first valve 3 is closed and the second valve is opened. When the fracturing fluid passes through the liquid outlet chamber 8, it can flush the circular sand filter screen 9 in the liquid outlet chamber 8, thereby separating the sand and gravel from the circular sand filter screen 9, completing the cleaning of the circular sand filter screen 9, avoiding the clogging of the circular sand filter screen 9, and extending the service life of the circular sand filter screen 9.

[0035] Example 3

[0036] On the basis of Example 2, Figure 2 As shown, the diameter of the circular sand filter screen 9 is smaller than the diameter of the inner wall of the filter box 5, and a plurality of limit plates 16 are arranged inside the liquid inlet chamber 7. The limit plates 16 correspond to the circular sand filter screens 9 one by one, and the limit plates 16 are arc-shaped. A limit groove is arranged on the side of the limit plate 16 close to the circular sand filter screen 9. The outer periphery of the circular sand filter screen 9 is slidably connected to the inner wall of the limit groove, and the limit plate 16 is connected to the inner wall of the liquid inlet chamber 7 away from the side of the circular sand filter screen 9.

[0037] The working principle and beneficial effects of the above technical solution are as follows: the diameter of the circular sand filter screen 9 is smaller than the diameter of the inner wall of the filter box 5. Therefore, there is a gap between the outer periphery of the circular sand filter screen 9 and the inner wall of the filter box 5. When the circular sand filter screen 9 is blocked, it can also ensure that part of the fracturing fluid passes through the filter box 5 into the transition pipe 4. At the same time, when the fracturing fluid flows in the liquid outlet cavity 8, the washed sand and gravel can flow to the bottom of the filter box 5 through the gap between the circular sand filter screen 9 and the inner wall of the filter box 5, and flow out to the outside of the filter box 5 through the liquid outlet pipe 13, thereby avoiding the accumulation of sand and gravel in the filter box 5, completing the cleaning of the circular sand filter screen 9, and the cleaning process does not require manual removal and cleaning, thereby improving the cleaning efficiency of the circular sand filter screen 9, and It also reduces the labor intensity of the staff. After the circular sand filter screen 9 in the liquid outlet chamber 8 is cleaned, it can be used for standby. When the circular sand filter screen 9 in the liquid inlet chamber 7 is blocked, the first motor 15 is started to drive the circular sand filter screen 9 to rotate, so that the circular sand filter screens 9 in the liquid inlet chamber 7 and the liquid outlet chamber 8 are exchanged, thereby improving the filtering capacity of the circular sand filter screen 9 and extending the service life of the circular sand filter screen 9. When the circular sand filter screen 9 rotates, the outer periphery of the circular sand filter screen 9 in the liquid inlet chamber 7 can slide along the inner wall of the limiting groove. The circular sand filter screen 9 is limited by the limiting groove, which can improve the stability of the circular sand filter screen 9 in the liquid inlet chamber 7 and avoid deformation of the circular sand filter screen 9 due to the impact of high-speed fracturing fluid.

[0038] Example 4

[0039] On the basis of Example 2 or 3, Figure 2 , Figure 3 As shown, a plurality of guide plates 17 are arranged in the liquid outlet cavity 8, and the guide plates 17 correspond to the circular sand filter nets 9 one by one, and the guide plates 17 and the circular sand filter nets 9 are arranged at intervals;

[0040] The guide plate 17 is semicircular in shape, the arc side of the guide plate 17 is connected to the inner wall of the liquid outlet cavity 8 , and a gap is set between the straight side of the guide plate 17 and the partition plate 6 .

[0041] The working principle and beneficial effects of the above technical solution are as follows: a plurality of guide plates 17 are arranged inside the liquid outlet chamber 8, and the guide plates 17 correspond to the circular sand filter screens 9 one by one, and the guide plates 17 are located below the corresponding circular sand filter screens 9. When the fracturing fluid enters the liquid outlet chamber 8 through the liquid outlet 11, the fracturing fluid first flows along the upper surface of the first circular sand filter screen 9, and part of the fracturing fluid can flush the upper surface of the circular sand filter screen 9, and flow on the guide plate 17 through the gap between the circular sand filter screen 9 and the inner wall of the filter box 5, while the other part passes through the filter holes of the circular sand filter screen 9, and flushes the sand and gravel blocked in the filter holes onto the guide plate 17, and then the fracturing fluid gathers and flows along the upper surface of the guide plate 17, and can flush the lower surface of the circular sand filter screen 9 above the guide plate 17 during the flow of the fracturing fluid, thereby further removing the sand and gravel on the circular sand filter screen 9, and then the sand and gravel carrying The fracturing fluid flows through the gap between the guide plate 17 and the partition plate 6 to the upper surface of the next circular sand filter screen 9. By repeating the above steps, the flushing of all the circular sand filter screens 9 can be completed, and the flushing range includes the upper and lower surfaces of the circular sand filter screen 9 and the filter holes of the circular sand filter screen 9, which improves the cleaning degree of the circular sand filter screen 9 and ensures the filtering capacity of the circular sand filter screen 9. In addition, the circular sand filter screen 9 does not need to be removed during the flushing process, thereby improving the cleaning efficiency. When cleaning the circular sand filter screen 9, the first valve 3 and the second valve can also be opened at the same time, and most of the fracturing fluid can flow into the main transmission pipe 1 through the fracturing fluid inlet pipe to ensure that the fracturing process is not interrupted. A small part of the fracturing fluid flows into the liquid outlet chamber 8 through the liquid outlet 11 to flush the circular sand filter screen 9 in the liquid outlet chamber 8, without affecting the efficiency of the fracturing operation. Cleaning the circular sand filter screen 9 is completed, thereby improving the efficiency.

[0042] Example 5

[0043] On the basis of any one of Examples 1-4, Figure 1-Figure 6 As shown, a collecting box 18 is arranged in the transition pipe 4, and the lower end of the collecting box 18 is connected to the upper end of the filter box 5, the collecting box 18 is located between the liquid inlet 10 and the liquid outlet 11, and the front and rear outer walls of the collecting box 18 are respectively connected to the front and rear inner walls of the transition pipe 4, and a sewage pipe 19 is arranged at the lower position of the front side wall of the collecting box 18, one end of the sewage pipe 19 is connected to the inside of the collecting box 18, and the other end of the sewage pipe 19 extends to the outside of the transition pipe 4 and is provided with a sewage valve, a sand retaining mechanism is arranged above the collecting box 18, a first sealing mechanism is arranged at the upper left end of the collecting box 18, and a second sealing mechanism is arranged at the upper right end of the collecting box 18.

[0044] The working principle and beneficial effects of the above technical solution are as follows: the collecting box 18 can separate the left and right sides of the transition pipe 4, and the fracturing fluid flowing into the liquid inlet 10 can flow along the right outer wall of the collecting box 18, and flow through the sand retaining mechanism to flow to the left outer wall of the collecting box 18, and finally flow into the fracturing fluid input pipe. The first sealing mechanism and the second sealing mechanism on the collecting box 18 can achieve the sealing of the upper end of the collecting box 18 to prevent a large amount of fracturing fluid from flowing into the collecting box 18. The sand retaining mechanism can block part of the sand and gravel in the fracturing fluid and discharge the sand and gravel into the collecting box 18. When there is too much sand and gravel in the collecting box 18, open the drain valve, and the sand and gravel in the collecting box 18 can flow out from the drain pipe 19 to the outside of the transition pipe 4.

[0045] Example 6

[0046] On the basis of Example 5, Figure 1 , Figure 2 As shown, the sand retaining mechanism includes a horizontally arranged second rotating shaft 20, and the front and rear ends of the second rotating shaft 20 are respectively rotatably connected to the front and rear inner walls of the transition pipe 4, a second motor 21 is arranged on the front outer wall of the transition pipe 4, and the output end of the second motor 21 is connected to the front end of the second rotating shaft 20, and a rotating cylinder 22 is arranged outside the second rotating shaft 20. The rotating cylinder 22 is concentrically arranged with the second rotating shaft 20, and the center of the rotating cylinder 22 is connected to the outer wall of the second rotating shaft 20. The upper end of the transition pipe 4 is arranged in an arc shape and is coaxially arranged with the rotating cylinder 22. The front and rear side walls of the rotating cylinder 22 are respectively slidably connected to the front and rear inner walls of the transition pipe 4, and a plurality of sand suction plates 23 are arranged on the outer wall of the rotating cylinder 22. The sand suction plates 23 are made of elastic material, and the plurality of sand suction plates 23 are distributed in a ring array about the central axis of the rotating cylinder 22. The sand suction plates 23 are arranged in a hemispherical shape at one end away from the rotating cylinder 22, and the sand suction plates 23 are in contact with the inner wall of the upper end of the transition pipe 4 at one end away from the rotating cylinder 22.

[0047] The working principle and beneficial effects of the above technical solution are as follows: the fracturing fluid flows into the transition pipe 4 and flows upward along the outer wall of the collection box 18, the fracturing fluid contacts the sand suction plate 23 and drives the sand suction plate 23 to rotate, the sand suction plate 23 drives the rotating cylinder 22 to rotate, a plurality of adsorption holes are arranged on the side wall of the sand suction plate 23, part of the sand and gravel will enter the adsorption holes, thereby being separated from the fracturing fluid, when the sand suction plate 23 passes the upper end of the collection box 18, part of the sand and gravel in the sand suction plate 23 will fall into the collection box 18, thereby further removing the fracturing fluid The sand and gravel in the fracturing fluid are reduced, thereby reducing the erosion of the inner wall of the main transmission pipe 1 by the fracturing fluid, and extending the service life of the whole fracturing wellhead device. When the fracturing fluid enters the transition pipe 4 through the liquid inlet 10, the second motor 21 is started, and the rotation of the second motor 21 drives the rotating cylinder 22 to rotate, and the rotation of the rotating cylinder 22 drives the sand suction plate 23 to rotate. When the sand suction plate 23 rotates, it can accelerate the flow of the fracturing fluid, increase the flow rate of the fracturing fluid, provide sufficient fracturing fluid for the fracturing fluid input pipe, and ensure the fracturing effect.

[0048] Example 7

[0049] On the basis of Example 6, Figure 2 , Figure 5 As shown, the first sealing mechanism includes a sliding hole 24 arranged in the left side wall of the collecting box 18, the upper end of the sliding hole 24 is connected to the interior of the transition pipe 4, a sliding plate 25 is slidably arranged in the sliding hole 24, a guide slope is arranged on the left side wall of the upper end of the sliding plate 25, a compression spring 26 is arranged at the lower end of the sliding plate 25, one end of the compression spring 26 is connected to the sliding plate 25, and the other end of the compression spring 26 is connected to the bottom wall of the sliding hole 24.

[0050] The working principle and beneficial effects of the above technical solution are as follows: when the sand suction plate 23 rotates to the first sealing mechanism, the end of the sand suction plate 23 close to the rotating cylinder 22 first contacts the upper end of the sliding plate 25, and then drives the sliding plate 25 to slide downward along the sliding hole 24, and the compression spring 26 is compressed. As the rotating cylinder 22 rotates, the sand suction plate 23 slides along the side wall of the sliding plate 25 until the end of the sand suction plate 23 passes through the upper end of the sliding plate 25. At this time, the sand suction plate 23 enters the collecting box 18. Under the action of the compression spring 26, the sliding plate 25 rebounds quickly and contacts the outer wall of the rotating cylinder 22, thereby playing a sealing role to prevent a large amount of fracturing fluid on the left side of the collecting box 18 from entering the collecting box 18.

[0051] Example 8

[0052] On the basis of Example 6 or 7, Figure 2 , Figure 6 As shown, the second sealing mechanism includes a fixed plate 27, which is arranged at the upper end of the right side wall of the collecting box 18. A third rotating shaft 28 is arranged on the right side of the fixed plate 27. The front and rear ends of the third rotating shaft 28 are respectively rotatably connected to the front and rear inner walls of the transition pipe 4. A torsion spring 29 is arranged on the third rotating shaft 28. One end of the torsion spring 29 is connected to the third rotating shaft 28, and the other end of the torsion spring 29 is connected to the upper end of the collecting box 18. A sealing plate 30 is arranged on the third rotating shaft 28, and the front and rear side walls of the sealing plate 30 are respectively slidably connected to the front and rear inner walls of the transition pipe 4.

[0053] The working principle and beneficial effects of the above technical solution are as follows: when the sand suction plate 23 rotates from the collecting box 18 to contact with the sealing plate 30, as the rotating cylinder 22 rotates, the end of the sand suction plate 23 gradually contacts with the inner wall of the sealing plate 30, and pushes the sealing plate 30 to rotate clockwise with the third rotating shaft 28 as the center. When the end of the sand suction plate 23 is separated from the inner wall of the sealing plate 30, under the action of the torsion spring 29, the sealing plate 30 returns to its original position, and the upper end of the sealing plate 30 contacts with the outer wall of the rotating cylinder 22. Under the pressure of the fracturing fluid, the inner wall of the sealing plate 30 fits with the fixed plate 27 to prevent the sealing plate 30 from rotating into the collecting box 18. The sealing plate 30 can seal the right side of the collecting box 18 to prevent a large amount of fracturing fluid on the right side of the collecting box 18 from entering the collecting box 18.

[0054] Example 9

[0055] On the basis of any one of Examples 6-8, Figure 2 , Figure 6 As shown, a blocking rod 31 is arranged between the rotating cylinder 22 and the collecting box 18 , and the front and rear ends of the blocking rod 31 are connected to the front and rear inner walls of the transition pipe 4 respectively.

[0056] The working principle and beneficial effects of the above technical solution are as follows: after the sand suction plate 23 enters the collecting box 18, the sand suction plate 23 gradually rotates near the lower end position until it contacts with the blocking rod 31. Since the sand suction plate 23 is elastic, under the action of the blocking rod 31, the sand suction plate 23 begins to bend until it passes through the blocking rod 31. After passing through the blocking rod 31, under the action of the elastic force, the sand suction plate 23 can return to its original state. In the process of the sand suction plate 23 bending to rebounding, the sand and gravel in the sand suction plate 23 are separated from the sand suction plate 23 due to inertia, and thus fall into the collecting box 18, completing the collection of sand and gravel. The sand suction plate 23 can be reused. After the sand suction plate 23 rotates to the outside of the collecting box 18, the sand suction plate 23 intercepts the sand and gravel again, further reducing the sand and gravel in the fracturing fluid, reducing the erosion of the inner wall of the main transmission pipe 1 by the fracturing fluid, and extending the overall service life of the fracturing wellhead device.

[0057] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0058] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A multifunctional fracturing wellhead device, characterized in that: include: A main transmission pipe (1), a fracturing fluid input pipe (2) is arranged on the side wall of the main transmission pipe (1), a first valve (3) is arranged on the fracturing fluid input pipe (2), a transition pipe (4) is arranged at one end of the fracturing fluid input pipe (2) away from the main transmission pipe (1), a filter box (5) is arranged at the lower end of the transition pipe (4), a partition (6) is arranged in the filter box (5), the partition (6) divides the inside of the filter box (5) into a liquid inlet chamber (7) and a liquid outlet chamber (8), a plurality of through holes are horizontally arranged in the partition (6), a circular sand filter screen (9) is horizontally arranged in the through holes, a part of the circular sand filter screen (9) is located in the liquid inlet chamber (7), and the other part of the circular sand filter screen (9) is located in the liquid outlet chamber (8). In the liquid cavity (8), a liquid inlet (10) and a liquid outlet (11) are respectively arranged at the upper end of the filter box (5); one end of the liquid inlet (10) is communicated with the interior of the liquid inlet cavity (7), and the other end of the liquid inlet (10) is communicated with the interior of the transition pipe (4); one end of the liquid outlet (11) is communicated with the interior of the liquid outlet cavity (8), and the other end of the liquid outlet (11) is communicated with the interior of the transition pipe (4); a second valve is arranged in the liquid outlet (11); a fracturing fluid inlet pipe (12) and a liquid outlet pipe (13) are respectively arranged at the lower end of the filter box (5); one end of the fracturing fluid inlet pipe (12) is communicated with the interior of the liquid inlet cavity (7), and one end of the liquid outlet pipe (13) is communicated with the interior of the liquid outlet cavity (8); A collecting box (18) is arranged in the transition pipe (4), the lower end of the collecting box (18) is connected to the upper end of the filter box (5), the collecting box (18) is located between the liquid inlet (10) and the liquid outlet (11), the front and rear outer walls of the collecting box (18) are respectively connected to the front and rear inner walls of the transition pipe (4), a sewage pipe (19) is arranged at the lower position of the front side wall of the collecting box (18), one end of the sewage pipe (19) is connected to the inside of the collecting box (18), the other end of the sewage pipe (19) extends to the outside of the transition pipe (4) and is provided with a sewage valve, a sand retaining mechanism is arranged above the collecting box (18), a first sealing mechanism is arranged at the upper left end of the collecting box (18), and a second sealing mechanism is arranged at the upper right end of the collecting box (18); The sand retaining mechanism comprises a second rotating shaft (20) arranged horizontally, the front and rear ends of the second rotating shaft (20) are respectively rotatably connected to the front and rear inner walls of the transition pipe (4), a second motor (21) is arranged on the front outer wall of the transition pipe (4), the output end of the second motor (21) is connected to the front end of the second rotating shaft (20), a rotating cylinder (22) is arranged outside the second rotating shaft (20), the rotating cylinder (22) is arranged concentrically with the second rotating shaft (20), the center of the rotating cylinder (22) is connected to the outer wall of the second rotating shaft (20), and the upper end of the transition pipe (4) is arranged The rotating cylinder (22) is arc-shaped and is coaxially arranged with the rotating cylinder (22). The front and rear side walls of the rotating cylinder (22) are respectively slidably connected to the front and rear inner walls of the transition pipe (4). The outer wall of the rotating cylinder (22) is provided with a plurality of sand suction plates (23). The sand suction plates (23) are made of elastic material. The plurality of sand suction plates (23) are distributed in a circular array about the central axis of the rotating cylinder (22). The end of the sand suction plate (23) away from the rotating cylinder (22) is arranged in a hemispherical shape. The end of the sand suction plate (23) away from the rotating cylinder (22) contacts the inner wall of the upper end of the transition pipe (4).

2. A multifunctional fracturing wellhead device according to claim 1, characterized in that: A cavity is provided in the partition (6), a first rotating shaft (14) is vertically provided in the cavity, the first rotating shaft (14) is fixedly connected to the center of the circular sand filter screen (9), the upper end of the first rotating shaft (14) is rotatably connected to the top wall of the filter box (5), the lower end of the first rotating shaft (14) extends to the outside of the filter box (5) and is connected to the output end of the first motor (15), and the first motor (15) is provided at the bottom of the filter box (5).

3. A multifunctional fracturing wellhead device according to claim 2, characterized in that: The diameter of the circular sand filter screen (9) is smaller than the diameter of the inner wall of the filter box (5). A plurality of limit plates (16) are arranged inside the liquid inlet chamber (7). The limit plates (16) correspond to the circular sand filter screens (9) one by one. The limit plates (16) are arc-shaped. A limit groove is arranged on one side of the limit plate (16) close to the circular sand filter screen (9). The outer periphery of the circular sand filter screen (9) is slidably connected to the inner wall of the limit groove. The side of the limit plate (16) away from the circular sand filter screen (9) is connected to the inner wall of the liquid inlet chamber (7).

4. A multifunctional fracturing wellhead device according to claim 2, characterized in that: A plurality of guide plates (17) are arranged in the liquid outlet cavity (8), the guide plates (17) correspond to the circular sand filter nets (9) one by one, and the guide plates (17) and the circular sand filter nets (9) are arranged at intervals.

5. A multifunctional fracturing wellhead device according to claim 4, characterized in that: The guide plate (17) is semicircular in shape, the arc side of the guide plate (17) is connected to the inner wall of the liquid outlet chamber (8), and a gap is provided between the straight side of the guide plate (17) and the partition plate (6).

6. The multifunctional fracturing wellhead device according to claim 1, characterized in that: The first sealing mechanism comprises a sliding hole (24) arranged in the left side wall of the collecting box (18), the upper end of the sliding hole (24) is connected to the interior of the transition pipe (4), a sliding plate (25) is slidably arranged in the sliding hole (24), a guide inclined surface is arranged on the left side wall of the upper end of the sliding plate (25), a compression spring (26) is arranged at the lower end of the sliding plate (25), one end of the compression spring (26) is connected to the sliding plate (25), and the other end of the compression spring (26) is connected to the bottom wall of the sliding hole (24).

7. The multifunctional fracturing wellhead device according to claim 1, characterized in that: The second sealing mechanism comprises a fixing plate (27), the fixing plate (27) being arranged at the upper end of the right side wall of the collecting box (18), a third rotating shaft (28) being arranged on the right side of the fixing plate (27), front and rear ends of the third rotating shaft (28) being respectively rotatably connected to the front and rear inner walls of the transition pipe (4), a torsion spring (29) being arranged on the third rotating shaft (28), one end of the torsion spring (29) being connected to the third rotating shaft (28), and the other end of the torsion spring (29) being connected to the upper end of the collecting box (18), a sealing plate (30) being arranged on the third rotating shaft (28), and front and rear side walls of the sealing plate (30) being respectively slidably connected to the front and rear inner walls of the transition pipe (4).

8. The multifunctional fracturing wellhead device according to claim 1, characterized in that: A blocking rod (31) is arranged between the rotating cylinder (22) and the collecting box (18), and the front and rear ends of the blocking rod (31) are respectively connected to the front and rear inner walls of the transition pipe (4).

Images