Sand-prevention fracturing wellhead device

Abstract

The invention relates to the technical field of fracturing, and particularly discloses a sand-prevention fracturing wellhead device which comprises a wellhead pipe, the wellhead pipe comprises a pipeline body and a conveying pipe, a filter pipe is arranged on the side face of the pipeline body, a filter assembly is installed in the filter pipe, and the filter assembly is in meshed connection with a buffer gear assembly. A locking assembly is installed on the side face of the buffering gear assembly, the locking assembly rotationally fixes the buffering gear assembly, a fan-shaped assembly is hinged to the side face of the filtering assembly, and a cleaning assembly is installed in the filtering assembly. By arranging the automatic valve and the filtering assembly, when the gravel content reaches a threshold value and the filtering effect is seriously reduced, the automatic valve is automatically controlled to close the pipeline to form a closed sand discharging space, so that the device can automatically control the automatic reaction according to the internal sand amount, and the filtering structure always keeps a higher filtering effect.

Description

Technical Field

[0001] The present invention relates to the field of fracturing technology, and more particularly to a sand control fracturing wellhead device. Background Art

[0002] In the oil field, fracturing refers to a method of forming fractures in an oil or gas reservoir by using hydraulic action during the oil or gas production process, also known as hydraulic fracturing. Fracturing artificially creates fractures in the formation to improve the underground flow environment of the oil, increase the oil well production, and plays an important role in improving the bottom hole flow conditions of the oil well, reducing the interlayer and improving the utilization status of the oil reservoir.

[0003] The Chinese invention patent with the publication number CN214944137U discloses a sand control fracturing wellhead device, specifically related to the field of fracturing technology. The utility model includes a first pipeline and a second pipeline, both of which are provided with valves. A filter cylinder is arranged between the first pipeline and the second pipeline, and both ends of the filter cylinder communicate with the first pipeline and the second pipeline respectively; a cover plate and a motor are arranged on the lower side wall of the filter cylinder. A roller shaft and a mounting groove matching the roller shaft are arranged inside the filter cylinder. Both ends of the roller shaft are rotatably connected to both ends of the mounting groove. A transmission belt is arranged between the motor and the roller shaft. A through hole matching the transmission belt is arranged on the filter cylinder, and the hole wall of the through hole is slidably connected to the transmission belt. The transmission belt is rollingly connected to the motor and the roller shaft. A mounting frame is arranged on the side wall of the roller shaft, and the mounting frame is slidably connected to the inner wall of the filter cylinder. A filter screen is arranged on the mounting frame. The sand control fracturing wellhead device proposed by the utility model can play a role in sand control and filtration, and improve the service life of the device.

[0004] It can be seen that the current sand control wellhead device does not accurately judge the sand content, and manual opening and closing valves are still required for sand removal operations. This makes it impossible for operators to accurately grasp real-time filtration effect and other information during the working state. At the same time, the existing sand removal mechanism only uses gravity and other effects for sand removal work, resulting in low work efficiency. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a sand control fracturing wellhead device to solve the problems existing in the above background art.

[0006] The present invention provides the following technical solution: A sand control fracturing wellhead device, including a wellhead pipe, the wellhead pipe includes a pipe main body and a delivery pipe. A filter pipe is provided on the side of the pipe main body, and a filter assembly is installed inside the filter pipe. The filter assembly is meshed and connected with a buffer gear assembly. A locking assembly is installed on the side of the buffer gear assembly, and the locking assembly rotates and fixes the buffer gear assembly. A sector assembly is hinged to the side of the filter assembly. A cleaning assembly is installed inside the filter assembly. The sector assembly is hinged and connected with the cleaning assembly. An automatic valve is installed inside the delivery pipe, and the rotating gears at both ends of the automatic valve are meshed with a zigzag tooth plate. A valve chuck is installed outside the wellhead pipe at the position of the automatic valve; Further, the filter assembly includes a filter plate. Connecting tooth plates are fixedly connected to the upper and lower parts of the filter plate. The connecting tooth plate is composed of two tooth plates. The two tooth plates are meshed with a first gear. An inner push plate is installed between the two tooth plates. The inner push plate is used to push the moving push plate to move laterally. Sliding grooves, transverse rod frames and spring frames are provided on the surface of the filter plate. The sector assembly is installed between the two transverse rod frames.

[0007] Further, the buffer gear assembly includes two first gears, which are fixedly connected by a gear rod. A second gear is sleeved on the gear rod. A scroll spring is installed inside the hollow of the second gear. The two ends of the scroll spring are respectively installed on the scroll spring and the gear rod.

[0008] Further, the cleaning assembly includes a telescopic cleaning rod. Spherical sliders are installed on both sides of the telescopic cleaning rod. The end of the spherical slider is a sphere, and the sphere is installed inside the filter plate. A spherical slider and a trapezoidal scraper are installed on the telescopic cleaning rod. A square connecting frame is installed inside the sliding groove and is provided with a filter net.

[0009] Further, the sector assembly includes a lower sector plate and an upper sector plate. A plurality of hinge frames are fixedly connected to the outside of the lower sector plate and the upper sector plate. A third spring and a connecting main rod are installed on the outside of the hinge frame.

[0010] Further, the locking assembly includes a chuck main body. A moving inner rod is fixedly connected to the side of the chuck main body. A second spring is sleeved on the outside of the moving inner rod. A moving push plate is fixedly connected to the front of the chuck main body. A displacement sensor is installed inside the chuck main body. The displacement sensor is used to collect the position information of the inner push plate. When the inner push plate reaches the chuck main body, it controls the chuck main body to move away from the second gear. When the inner push plate returns to the origin, it controls the chuck main body to approach the second gear to achieve re-fixation.

[0011] Further, the zigzag tooth plate is zigzag. Tooth grooves are respectively provided at the bottom and the side of both ends of the zigzag tooth plate. The bottom tooth groove is meshed with the second gear, and the side tooth groove is meshed with the automatic valve.

[0012] Furthermore, the automatic valve includes a valve plate and a rotating gear. A clamping groove is formed on the valve plate, and the position of the clamping groove corresponds to the position of the valve clamping block.

[0013] Furthermore, a sliding circular groove is formed inside the filter plate, and the spherical slider is installed inside the sliding circular groove.

[0014] Technical effects and advantages of the present invention: By providing an automatic valve and a filtering assembly, the present invention is conducive to automatically controlling the automatic valve to close the pipeline to form a closed sand discharge space when the sand content reaches a threshold value, resulting in a serious reduction in the filtering effect, enabling the device to automatically control and react according to the internal sand volume, and keeping the filtering structure always have a high filtering effect.

[0015] By providing a filtering assembly and a sector assembly, the present invention is conducive to when the hydraulic pressure on the left side of the filter plate increases due to the accumulation of gravel, the oil pushes the sector assembly to increase the angle, the sector assembly drives the cleaning assembly to move towards the center, and the two spherical sliders extend from the inside of the telescopic cleaning rod and use the trapezoidal scraper to push the gravel on the surface of the filter plate towards the middle position, so as to facilitate the discharge of the gravel from the sand discharge hole. Description of the drawings

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a sectional view of the overall structure of the present invention.

[0018] Figure 3 It is a sectional view of the overall structure of the present invention.

[0019] Figure 4 It is a schematic diagram of the structure of the filtering assembly of the present invention.

[0020] Figure 5 It is a schematic diagram of the structure of the buffer gear assembly of the present invention.

[0021] Figure 6 It is a schematic diagram of the structure of the cleaning assembly of the present invention.

[0022] Figure 7 It is a schematic diagram of the structure of the sector assembly of the present invention.

[0023] Figure 8 It is a schematic diagram of the structure of the locking assembly of the present invention.

[0024] Figure 9 It is a schematic diagram of the structure of the cleaning assembly of the present invention.

[0025] The reference numerals are as follows: 1, wellhead pipe; 101, pipeline main body; 102, conveying pipe; 103, filter pipe; 2, automatic valve; 3, buffer gear assembly; 301, first gear; 302, gear rod; 303, second gear; 304, scroll spring; 4, zigzag tooth plate; 5, filter assembly; 501, filter plate; 502, connecting tooth plate; 503, inner push plate; 504, sliding groove; 505, transverse rod frame; 506, spring frame; 6, locking assembly; 601, main block body; 602, moving inner rod; 603, second spring; 604, moving push plate; 7, sector assembly; 701, lower sector plate; 702, upper sector plate; 703, third spring; 704, connecting main rod; 8, cleaning assembly; 801, telescopic cleaning rod; 802, spherical slider; 803, trapezoidal scraper; 804, square connecting frame; 9, valve block. Detailed implementation mode

[0026] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the drawings in the present invention. In addition, the forms of each structure described in the following implementation modes are only examples. A sand control and fracturing wellhead device related to the present invention is not limited to the structures described in the following implementation modes. All other implementation modes obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0027] Referring to Figures 1-3 , the present invention provides a sand control and fracturing wellhead device, including a wellhead pipe 1. The wellhead pipe 1 includes a pipeline main body 101 and a conveying pipe 102. A filter pipe 103 is provided on the side of the pipeline main body 101. A filter assembly 5 is installed inside the filter pipe 103. The filter assembly 5 is meshed and connected with a buffer gear assembly 3. A locking assembly 6 is installed on the side of the buffer gear assembly 3. The locking assembly 6 rotates and fixes the buffer gear assembly 3. A sector assembly 7 is hinged to the side of the filter assembly 5. A cleaning assembly 8 is installed inside the filter assembly 5. The sector assembly 7 is hinged and connected with the cleaning assembly 8. An automatic valve 2 is installed inside the conveying pipe 102. The rotating gears at both ends of the automatic valve 2 are meshed with a zigzag tooth plate 4. A valve block 9 is installed outside the wellhead pipe 1 at the position of the automatic valve 2; In this embodiment, it should be specifically noted that: The valve block 9 is composed of a spring and a block. When the automatic valve 2 rotates to the closed state, the block enters the inside of the automatic valve 2 to achieve locking, forming a closed space for the sand removal process.

[0028] The main difference between this embodiment and the prior art is that in this embodiment, the displacement of the filter assembly is realized by using the change in the sand content filtered. The pulling force generated by the displacement automatically closes the valve when the sand in the device reaches the threshold, and automatically cleans the internal sand, realizing the stable filtering effect. Specifically, it lies in the automatic valve 2 and the filter assembly 5; The above structure is the main structure of this embodiment, which solves the problem that the filtering effect of the current filtering component cannot be clearly displayed. The motor and screw rod used for sand removal are existing structures, and the specific structures and connection methods of the motor and screw rod are not described in detail in this embodiment.

[0029] Refer to Figure 4 , the filtering component 5 includes a filter plate 501. Connecting toothed plates 502 are fixedly connected to the upper and lower parts of the filter plate 501. The connecting toothed plates 502 are composed of two toothed plates, and the two toothed plates are meshed with the first gear 301. An inner pushing plate 503 is installed between the two toothed plates. The inner pushing plate 503 is used to push the moving pushing plate 604 to move sideways. Sliding grooves 504, transverse rod frames 505 and spring frames 506 are formed on the surface of the filter plate 501. The sector component 7 is installed between the two transverse rod frames 505. The accumulation of gravel causes the filter plate 501 to move to the right. When it reaches the end point, it pulls the automatic valve 2 to start moving, realizing the automatic reaction of the gravel content and controlling the change of the internal environment.

[0030] In this embodiment, it should be specifically noted that: a sliding circular groove is formed inside the filter plate 501, and the spherical slider 802 is installed inside the sliding circular groove.

[0031] Refer to Figure 5 , the buffer gear component 3 includes two first gears 301, and the two first gears 301 are fixedly connected by a gear rod 302. A second gear 303 is sleeved on the gear rod 302. A scroll spring 304 is installed inside the hollow of the second gear 303. The two ends of the scroll spring 304 are respectively installed on the scroll spring 304 and the gear rod 302. When the first gear 301 rotates, the rotation of the first gear 301 has a tendency to drive the second gear 303 to move. However, since the main body of the block 601 is stuck in the tooth groove of the second gear 303, the second gear 303 will not rotate driven by the first gear 301 at this time. Correspondingly, the scroll spring 304 will store the rotational force.

[0032] In this embodiment, it should be specifically noted that: the scroll spring 304 prevents the buffer gear component 3 from directly transmitting power from the filtering component 5 to the automatic valve 2. Through the buffering and force storage of the scroll spring 304, the automatic valve 2 reacts and moves after the filtering component 5 reaches the threshold.

[0033] Refer to Figure 6, the cleaning assembly 8 includes a telescopic cleaning rod 801. Spherical sliders 802 are installed on both sides of the telescopic cleaning rod 801. The ends of the spherical sliders 802 are spheres, and the spheres are installed at the inner edge of the filter plate 501. A spherical slider 802 and a trapezoidal scraper 803 are installed on the telescopic cleaning rod 801. A square connecting frame 804 is located inside the sliding groove 504 and is equipped with a filter screen to prevent grit from passing through the filter screen to the other side of the sliding groove 504 when moving. When the telescopic cleaning rod 801 moves up and down, the trapezoidal scraper 803 pushes the grit on the surface of the filter plate 501 towards the middle position, facilitating the discharge of materials.

[0034] In this embodiment, it should be specifically noted that: as a scraper, the way the trapezoidal scraper 803 pushes the grit during its movement and its installation method belong to the prior art, and this application does not make specific limitations on its installation method.

[0035] Refer to Figure 7 , the fan-shaped assembly 7 includes a lower fan-shaped plate 701 and an upper fan-shaped plate 702. A plurality of hinge frames are fixedly connected to the outer sides of the lower fan-shaped plate 701 and the upper fan-shaped plate 702. A third spring 703 and a connecting main rod 704 are installed on the outer sides of the hinge frames. When the hydraulic pressure on the left side of the filter plate 501 increases due to the accumulation of grit, the oil pushes the fan-shaped assembly 7 to increase the angle. The fan-shaped assembly 7 drives the cleaning assembly 8 to move towards the center through the connecting main rod 704. Two spherical sliders 802 extend from the inside of the telescopic cleaning rod 801 and use the trapezoidal scraper 803 to push the grit on the surface of the filter plate 501 towards the middle position.

[0036] In this embodiment, it should be specifically noted that: the third spring 703 has an inward pulling force on the lower fan-shaped plate 701 and the upper fan-shaped plate 702, and the pulling force overcomes the thrust of the liquid to keep it constant. When the pressure increases, the rotation angle of the lower fan-shaped plate 701 increases, and the moving distance of the cleaning assembly 8 increases.

[0037] Refer to Figure 8 , the locking assembly 6 includes a block main body 601. A moving inner rod 602 is fixedly connected to the side of the block main body 601. A second spring 603 is sleeved on the outer side of the moving inner rod 602. A moving push plate 604 is fixedly connected to the front of the block main body 601. The block main body 601 is installed on the side of the second gear 303 to prevent it from moving normally.

[0038] In this embodiment, it should be specifically noted that: as a non-preferred implementation, a displacement sensor is installed inside the block main body 601. The displacement sensor is used to collect the position information of the inner push plate 503. When the inner push plate 503 reaches the block main body 601, it controls the block main body 601 to move away from the second gear 303. When the inner push plate 503 returns to the origin, it controls the block main body 601 to approach the second gear 303 to achieve re-fixation.

[0039] Refer toFigure 9 The zigzag tooth plate 4 is zigzag-shaped. Both ends of the zigzag tooth plate 4 are provided with tooth grooves at the bottom and the side respectively. The bottom tooth groove meshes with the second gear 303, and the side tooth groove meshes with the automatic valve 2. When it moves to the rightmost side under the action of the pressure of the filter plate 501, at this time, the block body 601 no longer fixes the tooth groove. The second gear 303 rotates rapidly under the action of the huge spring potential energy, driving the zigzag tooth plate 4 to move to the right. The zigzag tooth plate 4 drives the automatic valve 2 to start rotating until the automatic valve 2 completely closes the pipeline of the delivery pipe 102.

[0040] In this embodiment, it should be specifically noted that: The automatic valve 2 includes a valve plate and a rotating gear. A clamping groove is provided on the valve plate, and the position of the clamping groove corresponds to the position of the valve block 9. When the automatic valve 2 rotates to the closed state, the valve block 9 is stuck inside the clamping groove, keeping the inside of the device closed, which is convenient for the stability of the sand removal state.

[0041] The working principle of the present invention: The main problem solved by this embodiment is: Utilizing the change in the content of filtered sand and gravel to realize the displacement of the filter assembly. The tensile force generated by the displacement causes the valve to automatically close when the sand and gravel in the device reach the threshold, automatically cleaning the internal sand and gravel, and realizing the stable filtering effect, solving the problem that the filtering effect of the current filter assembly cannot be clearly displayed.

[0042] The specific steps are as follows: The oil fluid flows from the delivery pipe 102 to the pipeline main body 101 and flows out from the pipeline main body 101 under the filtering action of the filter plate 501. As time increases, the accumulation of gravel on the surface of the filter plate 501 causes the filtering effect to decrease. The filter plate 501 moves to the right under the pipeline pressure. Since the connecting tooth plate 502 is meshed and connected with the first gear 301, at this time, the connecting tooth plate 502 drives the first gear 301 to rotate. The rotation of the first gear 301 has a tendency to drive the second gear 303 to move, but since the block body 601 is stuck on the tooth groove of the second gear 303, at this time, the second gear 303 will not rotate driven by the first gear 301, and correspondingly, the scroll spring 304 will store the rotational force; When the hydraulic pressure on the left side of the filter plate 501 increases due to the accumulation of gravel, the oil fluid pushes the sector assembly 7 to increase the angle. The sector assembly 7 drives the cleaning assembly 8 to move towards the center through the connecting main rod 704. The two spherical sliders 802 extend from the inside of the telescopic cleaning rod 801 and use the trapezoidal scraper 803 to push the gravel on the surface of the filter plate 501 towards the middle position, facilitating the discharge of materials; When the sand content reaches the threshold and causes a serious reduction in the filtering effect, the filter plate 501 moves to the rightmost side under the action of pressure. At this time, the inner push plate 503 contacts the moving push plate 604 and reduces the pushing force. At this time, the main body of the clamping block 601 no longer fixes the tooth groove. The second gear 303 rotates rapidly under the action of the huge spring potential energy, driving the zigzag tooth plate 4 to move to the right. The zigzag tooth plate 4 drives the automatic valve 2 to start rotating until the automatic valve 2 completely closes the pipeline of the conveying pipe 102. At this time, the horizontal hole opened on the automatic valve 2 faces the valve clamping block 9, and the valve clamping block 9 is clamped inward inside the horizontal hole to realize the angle fixation of the automatic valve 2 and prevent it from moving during cleaning; With the completion of the closing, the sand discharge hole is opened, and a rotating rod and a motor are installed inside. The screw rod drives the sand and gravel inside under the drive of the motor. As the cleaning continues, the filter plate 501 gradually moves to the left, pushing the sand and gravel out of the sand discharge hole, and at the same time returning to the initial position for easy reuse. At this time, the filtering effect is in the best state.

[0043] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A sand control fracturing wellhead device, comprising a wellhead pipe (1), characterized in that: The wellhead pipe (1) comprises a pipe body (101) and a delivery pipe (102); a filter pipe (103) is provided on the side of the pipe body (101); a filter assembly (5) is installed inside the filter pipe (103); the filter assembly (5) is meshedly connected with a buffer gear assembly (3); a locking assembly (6) is installed on the side of the buffer gear assembly (3); the locking assembly (6) rotatably fixes the buffer gear assembly (3); a fan-shaped assembly (7) is hingedly connected to the side of the filter assembly (5); a cleaning assembly (8) is installed inside the filter assembly (5); the fan-shaped assembly (7) is hingedly connected to the cleaning assembly (8); an automatic valve (2) is installed inside the delivery pipe (102); the rotating gears at both ends of the automatic valve (2) are meshedly connected with the herringbone toothed plate (4); a valve block (9) is installed outside the wellhead pipe (1) at the automatic valve (2); and a sand discharge hole is provided on the front of the wellhead pipe (1); The filter assembly (5) comprises a filter plate (501), the filter plate (501) being fixedly connected to a connecting tooth plate (502) at the top and bottom, the connecting tooth plate (502) being composed of two tooth plates, the two tooth plates being meshingly connected to the first gear (301), an inner push plate (503) being installed between the two tooth plates, the inner push plate (503) being used to push the movable push plate (604) to move sideways, a sliding groove (504), a transverse rod frame (505) and a spring frame (506) being provided on the surface of the filter plate (501), and the fan-shaped assembly (7) being installed between the two transverse rod frames (505).

2. The sand control fracturing wellhead device according to claim 1, characterized in that: The buffer gear assembly (3) comprises two first gears (301), the two first gears (301) are fixedly connected via a gear rod (302), a second gear (303) is sleeved on the gear rod (302), a scroll spring (304) is installed in the hollow interior of the second gear (303), and two ends of the scroll spring (304) are respectively installed on the scroll spring (304) and the gear rod (302).

3. The sand control fracturing wellhead device according to claim 1, characterized in that: The cleaning assembly (8) comprises a telescopic cleaning rod (801), spherical sliders (802) are installed on both sides of the telescopic cleaning rod (801), the ends of the spherical sliders (802) are spheres, and the spheres are installed inside the filter plate (501), the spherical sliders (802) and the trapezoidal scraper (803) are installed on the telescopic cleaning rod (801), and a square connecting frame (804) is located inside the sliding groove (504) and is installed with a filter screen.

4. The sand control fracturing wellhead device according to claim 1, characterized in that: The fan-shaped assembly (7) comprises a lower fan-shaped plate (701) and an upper fan-shaped plate (702), wherein a plurality of hinged frames are fixedly connected to the outer sides of the lower fan-shaped plate (701) and the upper fan-shaped plate (702), and a third spring (703) and a connecting main rod (704) are installed on the outer sides of the hinged frames.

5. The sand control fracturing wellhead device according to claim 1, characterized in that: The locking assembly (6) comprises a card block body (601), a movable inner rod (602) is fixedly connected to the side of the card block body (601), a second spring (603) is sleeved on the outer side of the movable inner rod (602), and a movable push plate (604) is fixedly connected to the front of the card block body (601). A displacement sensor is installed inside the card block body (601), and the displacement sensor is used to collect position information of the inner push plate (503). When the inner push plate (503) reaches the card block body (601), the card block body (601) is controlled to move away from the second gear (303). When the inner push plate (503) returns to the origin, the card block body (601) is controlled to move close to the second gear (303) to achieve re-fixation.

6. The sand control fracturing wellhead device according to claim 1, characterized in that: The zigzag tooth plate (4) is zigzag-shaped, and tooth grooves are respectively provided at the bottom and the side of the two ends of the zigzag tooth plate (4), the bottom tooth groove meshes with the second gear (303), and the side tooth groove meshes with the automatic valve (2).

7. The sand control fracturing wellhead device according to claim 1, characterized in that: The automatic valve (2) comprises a valve plate and a rotating gear. The valve plate is provided with a slot, and the position of the slot corresponds to the position of the valve clamping block (9).

8. The sand control fracturing wellhead device according to claim 1, characterized in that: A circular sliding groove is provided inside the filter plate (501), and the spherical slider (802) is installed inside the circular sliding groove.

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