Coal bed gas fracturing wellhead connector reinforcing device

Abstract

The utility model discloses a kind of coalbed gas fracturing wellhead connecting piece reinforcing device, including bottom plate, the upper end both sides of bottom plate are fixed with baffle, one side of one baffle is equipped with hydraulic push structure, and buffer mechanism is installed on the other baffle, one end of the buffer mechanism is connected with L type moving plate;The middle part of bottom plate is equipped with opening, one end of L type moving plate and hydraulic push structure is fixed with arc clamping ring, the arc clamping ring penetrates opening, two arc clamping rings correspond to each other;The upper and lower ends of the arc clamping ring are fixed with rubber pad, two rubber pads on the same horizontal plane correspond to each other.The utility model can realize the adaptation of dynamic condition, improve the stability and firmness of clamping, can also ensure that clamping force is evenly distributed, significantly delay thread loosening, avoid plastic deformation caused by point contact simultaneously, enhance practicality.

Description

Technical Field

[0001] This utility model relates to the field of reinforcement technology for coalbed methane fracturing wellhead connectors, and in particular to a reinforcement device for coalbed methane fracturing wellhead connectors. Background Technology

[0002] In coalbed methane fracturing operations, the production casing must withstand periodic high-pressure fluid impacts (pressures can reach 70-100 MPa). Traditional wellhead connectors pose the following risks: 1. Risk of thread slippage: When the pressure rises suddenly, the thread at the sleeve connection is subjected to huge axial tensile force and vibration, which can easily cause stress concentration, leading to plastic deformation or slippage of the thread. 2. Vibration fatigue failure: The instantaneous start and stop of fracturing pump injection causes high-frequency vibration, which accelerates the loosening of connecting parts, resulting in sealing failure or tubing breakage.

[0003] To address these issues, we propose a reinforcement device for coalbed methane fracturing wellhead connectors. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a reinforcement device for coalbed methane fracturing wellhead connectors.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A reinforcement device for coalbed methane fracturing wellhead connectors includes a base plate, with baffles fixed on both sides of the upper end of the base plate. A hydraulic pushing structure is installed on one side of one baffle, and a buffer mechanism is installed on the other baffle. One end of the buffer mechanism is connected to an L-shaped movable plate. The base plate has an opening in the middle, and one end of the L-shaped moving plate and the hydraulic pushing structure is fixed with an arc-shaped clamping ring. The arc-shaped clamping ring passes through the opening, and the two arc-shaped clamping rings correspond to each other. Both ends of the arc-shaped clamping ring are fixed with rubber pads, and the two rubber pads on the same horizontal plane correspond to each other.

[0006] Preferably, the hydraulic pushing structure includes a hydraulic cylinder fixed in the middle of one side of one of the baffles, the piston rod of the hydraulic cylinder passing through the side wall of the baffle and extending to one side of the baffle, and the end of the piston rod of the hydraulic cylinder being mounted on one side of one of the arc-shaped clamping rings via a second connecting plate.

[0007] Preferably, a connecting rod is fixed to the middle of one side of the L-shaped movable plate, and a first mounting plate is fixed to one end of the connecting rod. One end of the first mounting plate is fixed to one side of another arc-shaped clamping ring.

[0008] Preferably, the lower end of the L-shaped movable plate is fixed with a slider, and the upper side of the base plate is provided with a groove, in which the slider is engaged.

[0009] Preferably, the buffer mechanism includes hydraulic buffer cylinders fixed on both sides of one of the baffles, one end of the hydraulic buffer cylinders being connected to one side of the L-shaped moving plate, and a damper being fixed on one side of one of the baffles, one end of the damper being connected to the middle of the L-shaped moving plate.

[0010] Preferably, the lower ends of the baffle are fixed with fasteners on both sides, and the lower ends of the fasteners are connected to the upper ends of the base plate.

[0011] Preferably, the base plate has mounting holes at all four corners.

[0012] Preferably, the arc-shaped clamping ring is made of stainless steel.

[0013] In this utility model, during installation: Step 1: Device Installation and Positioning 1. Base fixing: The base plate is anchored to the wellhead support through the four corner mounting holes to ensure overall anti-overturning stability; 2. Sleeve alignment: The production sleeve connection passes vertically through the opening in the middle of the base plate and is located at the symmetrical center of the two arc-shaped clamping rings; Step 2: Hydraulic clamping 1. Active side clamping: The hydraulic cylinder piston rod extends → pushes the second connecting plate → drives the right arc-shaped clamping ring to move toward the side wall of the sleeve; 2. Driven-side linkage: The right clamping ring displacement combined with the left clamping ring clamping ensures uniform distribution of clamping force and avoids casing bending caused by unilateral pressure. Step 3: Elastic Buffering and Dynamic Voltage Regulation 1. Impact absorption stage: When the fracturing pressure rises sharply, the axial vibration of the casing is transmitted to the left clamping ring, which pushes the L-shaped moving plate to retract, thus compressing the hydraulic buffer cylinder and damper. 2. Dual energy consumption mechanism: The hydraulic buffer cylinder converts kinetic energy into heat energy for dissipation, while the damper provides viscous resistance to suppress high-frequency vibrations. 3. Contact surface protection: Rubber pads cover the upper and lower end faces inside the clamping ring to achieve stress buffering, while avoiding direct contact with the screw connection, reducing local contact stress peaks, preventing slippage and increasing friction, and the high coefficient of friction rubber prevents fretting wear of the sleeve.

[0014] This utility model has the following advantages: 1. The combination of damper and hydraulic buffer cylinder can adapt to dynamic working conditions and improve the stability and firmness of clamping. 2. The stainless steel arc-shaped clamping ring provides rigid support, and the rubber pad compensates for the unevenness of the sleeve surface, avoiding plastic deformation caused by point contact; 3. The hydraulic buffer cylinder provides stable clamping, maintaining continuous pressure on the sealing surface, ensuring uniform distribution of clamping force, and significantly delaying thread loosening; In summary, this utility model can adapt to dynamic working conditions, improve the stability and firmness of clamping, ensure uniform distribution of clamping force, significantly delay thread loosening, and avoid plastic deformation caused by point contact, thus enhancing its practicality. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the present invention; Figure 2 A structural diagram showing the first mounting plate of this utility model; Figure 3 This is a diagram of the opposing clamping structure of the arc-shaped clamping ring of this utility model; Figure 4 This is a structural diagram showing the arc-shaped clamping ring and rubber pad of this utility model.

[0016] In the diagram: 101 base plate, 102 opening, 103 mounting hole, 201 baffle, 202 fastener, 301 hydraulic buffer cylinder, 302 damper, 303 mounting base, 401 L-shaped moving plate, 402 connecting rod, 403 first mounting plate, 501 slider, 502 slide groove, 601 hydraulic cylinder, 602 rubber pad, 603 arc-shaped clamping ring. Detailed Implementation

[0017] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0018] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0019] Some exemplary embodiments of the present invention have been described for illustrative purposes. It should be understood that the present invention may be implemented in other ways not specifically shown in the accompanying drawings.

[0020] Reference Figure 1-4 A coalbed methane fracturing wellhead connector reinforcement device includes a base plate 101, with baffles 201 fixed on both sides of the upper end of the base plate 101. The baffles 201 are connected to the base plate 101 by high-strength alloy steel fasteners 202, using 8.8 grade M16 bolts with shear strength ≥640MPa, and can withstand instantaneous impact loads of up to 15MPa during fracturing operations. One side of one of the baffles 201 is equipped with a hydraulic pushing structure, and the other baffle 201 is equipped with a buffer mechanism, one end of which is connected to an L-shaped moving plate 401. An opening 102 is provided in the middle of the base plate 101. An arc-shaped clamping ring 603 is fixed at one end of the L-shaped moving plate 401 and the hydraulic pushing structure. The arc-shaped clamping ring 603 passes through the opening 102, and the two arc-shaped clamping rings 603 correspond to each other. Rubber pads 602 are fixed at both the upper and lower ends of the arc-shaped clamping ring 603. The two rubber pads 602 on the same horizontal plane correspond to each other. The rubber pads 602 reduce the peak contact stress by 60%. The hydraulic pushing structure includes a hydraulic cylinder 601 fixed in the middle of one side of one of the baffles 201. When the hydraulic cylinder 601 pushes, the built-in pressure sensor monitors the clamping force in real time. When the preset value is reached, the pressure is automatically maintained. The PLC controls the hydraulic cylinder to compensate for the displacement of 0.1-0.5mm, forming a dynamic force-displacement dual closed-loop control to maintain the pressure fluctuation of the clamping surface <±10%. The piston rod of the hydraulic cylinder 601 passes through the side wall of the baffle 601 and extends to one side of the baffle 201. The end of the piston rod of the hydraulic cylinder 601 is installed on one side of one of the arc-shaped clamping rings 603 through the second connecting plate. The hydraulic cylinder 601 is a double-acting servo hydraulic cylinder with a stroke of 200mm, a thrust of 80kN, and a response time of <0.2s. The built-in displacement sensor provides real-time feedback on the piston rod position, and the clamping force is adjusted with a precision of ±5% by combining it with the PID control system. A connecting rod 402 is fixed to the middle of one side of the L-shaped movable plate 401. A first mounting plate 403 is fixed to one end of the connecting rod 402. One end of the first mounting plate 403 is fixed to one side of another arc-shaped clamping ring 603. The lower end of the L-shaped moving plate 401 is fixed with a slider 501, and the upper side of the base plate 101 is provided with a slide groove 502. The slider 501 is engaged in the slide groove 502. The slider 501 and the slide groove 502 are set with a T-shaped guide rail, and the fit gap is ≤0.05mm, ensuring that the displacement deviation of the L-shaped moving plate 401 is <1mm under 10Hz vibration environment. The buffer mechanism includes hydraulic buffer cylinders 301 fixed on both sides of one of the baffles 201. One end of the hydraulic buffer cylinder 301 is connected to one side of the L-shaped moving plate 401. A damper 302 is fixed on one side of one of the baffles 201. One end of the damper 302 is connected to the middle of the L-shaped moving plate 401. The hydraulic buffer cylinder 301 and the damper 302 can dissipate more than 90% of the axial impact kinetic energy. Both sides of the lower end of the baffle 201 are fixed with fasteners 202. The lower end of the fasteners 202 is connected to the upper end of the base plate 101. The four corners of the base plate 101 are provided with mounting holes 103. The arc-shaped clamping ring 603 is made of stainless steel. The surface of the stainless steel arc-shaped clamping ring 603 is shot peened to improve fatigue strength. In this utility model, during installation: Step 1: Device Installation and Positioning 1. Base fixing: The base plate 101 is anchored to the wellhead support through the four corner mounting holes 103 to ensure overall anti-overturning stability; 2. Sleeve alignment: The production sleeve connection passes vertically through the opening 102 in the middle of the base plate and is located at the symmetrical center of the two arc-shaped clamping rings 603; Step 2: Hydraulic clamping 1. Active side clamping: The piston rod of hydraulic cylinder 601 extends → pushes the second connecting plate → drives the right arc-shaped clamping ring 603 to move toward the side wall of the sleeve; 2. Driven-side linkage: The right clamping ring displacement combined with the left clamping ring clamping ensures uniform distribution of clamping force and avoids casing bending caused by unilateral pressure. Step 3: Elastic Buffering and Dynamic Voltage Regulation 1. Impact absorption stage: When the fracturing pressure rises sharply, the axial vibration of the casing is transmitted to the left clamping ring, which pushes the L-shaped moving plate 401 to retract, which in turn compresses the hydraulic buffer cylinder 301 and the damper 302. 2. Dual energy consumption mechanism: The hydraulic buffer cylinder 301 converts kinetic energy into heat energy for dissipation, and the damper 302 provides viscous resistance to suppress high-frequency vibration. 3. Contact surface protection: Rubber pad 602 covers the upper and lower end faces inside the clamping ring to achieve stress buffering, while avoiding direct contact with the screw connection, reducing local contact stress peaks, preventing slippage and increasing friction, and the high friction coefficient rubber prevents fretting wear of the sleeve.

[0021] This utility model is applicable to the following fields: I. Hydraulic fracturing operations for coalbed methane / shale gas Wellhead equipment protection Designed specifically for the connection points between wellhead equipment (such as the production tree and casing head) and surface manifolds during fracturing. The instantaneous impact and vibration caused by high-pressure fracturing fluid (pressure can reach over 15MPa) can easily lead to loosening and failure of the connection. The device's arc-shaped clamping ring dynamic pressure stabilization system (PLC closed-loop control + servo hydraulic cylinder) can compensate for displacement fluctuations in real time, ensuring stable pressure at the connection surface (fluctuation <±10%) and preventing high-pressure fluid leakage.

[0022] Vibration-resistant reinforcement of casing The combination of hydraulic buffer cylinder and damper can dissipate 90% of the impact kinetic energy. With the help of T-shaped guide rail (gap ≤ 0.05mm), it limits the axial displacement deviation of the casing (<1mm@10Hz), avoiding high-frequency vibration that causes casing thread wear or fatigue fracture. It is especially suitable for multi-round impact conditions of horizontal well staged fracturing.

[0023] II. Unconventional Natural Gas Development Shale gas ultra-high pressure fracturing The double-acting servo hydraulic cylinder with 80kN thrust (response <0.2s) can handle reservoir stimulation pressures above 30MPa, and the stainless steel shot-peened reinforced clamping ring meets the corrosion resistance requirements of acidic working conditions.

[0024] Repeated fracturing of tight gas wells The dynamic clamping system protects the casing surface with rubber pads (reducing peak stress by 60%), reducing damage to the casing from repeated operations and extending the life of wellhead equipment.

[0025] III. Safe Connection of High-Pressure Fluid Transport System Emergency Leak Sealing of Oil and Gas Gathering and Transportation Pipelines The quick-clamping mechanism can achieve pressurized sealing when a pipe ruptures, the arc-shaped ring adapts to changes in pipe diameter, and the rubber gasket enhances the sealing performance.

[0026] Chemical high-pressure reaction pipeline reinforcement Suitable for easily vibrating parts such as reactor inlet and outlet, pump and valve connection points, etc., the buffer mechanism suppresses pipeline oscillations caused by flow pulsation.

[0027] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A reinforcement device for coalbed methane fracturing wellhead connectors, comprising a base plate (101), characterized in that, Both sides of the upper end of the base plate (101) are fixed with baffles (201). One side of one baffle (201) is equipped with a hydraulic pushing structure, and the other baffle (201) is equipped with a buffer mechanism. One end of the buffer mechanism is connected to an L-shaped moving plate (401). The base plate (101) has an opening (102) in the middle. One end of the L-shaped moving plate (401) and the hydraulic pushing structure is fixed with an arc-shaped clamping ring (603). The arc-shaped clamping ring (603) passes through the opening (102) and the two arc-shaped clamping rings (603) correspond to each other. Both ends of the arc-shaped clamping ring (603) are fixed with rubber pads (602), and the two rubber pads (602) on the same horizontal plane correspond to each other.

2. The coalbed methane fracturing wellhead connector reinforcement device according to claim 1, characterized in that: The hydraulic pushing structure includes a hydraulic cylinder (601) fixed in the middle of one side of one of the baffles (201). The piston rod of the hydraulic cylinder (601) passes through the side wall of the baffle (201) and extends to one side of the baffle (201). The end of the piston rod of the hydraulic cylinder (601) is mounted on one side of one of the arc-shaped clamping rings (603) through a second connecting plate.

3. The coalbed methane fracturing wellhead connector reinforcement device according to claim 1, characterized in that: A connecting rod (402) is fixed to the middle of one side of the L-shaped movable plate (401), and a first mounting plate (403) is fixed to one end of the connecting rod (402). One end of the first mounting plate (403) is fixed to one side of another arc-shaped clamping ring (603).

4. The coalbed methane fracturing wellhead connector reinforcement device according to claim 1, characterized in that: The lower end of the L-shaped movable plate (401) is fixed with a slider (501), and the upper side of the base plate (101) is provided with a groove (502), and the slider (501) is engaged in the groove (502).

5. The coalbed methane fracturing wellhead connector reinforcement device according to claim 1, characterized in that: The buffer mechanism includes a hydraulic buffer cylinder (301) fixed on both sides of one of the baffles (201), one end of the hydraulic buffer cylinder (301) being connected to one side of an L-shaped moving plate (401), and a damper (302) fixed on one side of one of the baffles (201), one end of the damper (302) being connected to the middle of the L-shaped moving plate (401).

6. The coalbed methane fracturing wellhead connector reinforcement device according to claim 1, characterized in that: The lower ends of the baffle (201) are fixed with fasteners (202) on both sides, and the lower ends of the fasteners (202) are connected to the upper ends of the base plate (101).

7. The coalbed methane fracturing wellhead connector reinforcement device according to claim 1, characterized in that: The base plate (101) has mounting holes (103) at all four corners.

8. The coalbed methane fracturing wellhead connector reinforcement device according to claim 1, characterized in that: The arc-shaped clamping ring (603) is made of stainless steel.

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