A rapid connection device for a fracturing wellhead and its usage method

Abstract

The present invention relates to the technical field of oil and gas well fracturing wellhead equipment, and specifically relates to a rapid connection device for a fracturing wellhead and its usage method. The device includes an upper joint, a swivel joint, a base, and an oil production wellhead. An inner mounting seat is provided inside the swivel joint, and an inner screw sleeve is rotatably installed in the swivel joint. A plug is provided at the upper opening of the base, and a butterfly valve plate is provided at the lower opening of the base. An isolation seat is fixedly provided inside the base. The lower end of the plug is fixedly connected to a column, and the lower end of the column extends into the isolation seat and is fixedly connected to a limit disc. A return spring is fixedly provided at the lower end of the limit disc, and push components are provided at both the front and rear ends of the limit disc. Multiple groups of first driven bars, second driven bars, and third driven bars are provided inside the base; the device can achieve the rapid connection between the pipeline joint and the wellhead, reducing the downtime caused by repair problems; a usage method for the rapid connection device for a fracturing wellhead is also provided, which improves the assembly efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas well fracturing wellhead equipment, and specifically relates to a rapid connection device for a fracturing wellhead and its usage method. Background Technique

[0002] In oilfield production, it is necessary to seal and protect the shut-down fracturing wellhead, aiming to prevent debris from falling into the well and prevent oil and gas in the well from overflowing.

[0003] The Chinese invention patent with the application number CN202311443045.1 discloses a mechanical wellhead sealing and protecting device. This device uses hydraulic pressure to push the setting piston, so that the anchor block is anchored on the inner wall of the casing, and the rubber cylinder adheres to the inner wall of the casing to achieve effective plugging of the wellhead. However, this sealing and protecting device is installed several meters below the wellhead. Although it eliminates the problem of the loss of the wellhead cap, it also requires additional construction costs and time to install the device at a deeper position, increasing the construction difficulty and cost. And because the device is located deeper, it may increase the difficulty of inspection, maintenance and component replacement, resulting in an increase in future maintenance costs. Summary of the Invention

[0004] The purpose of the present invention is to provide a rapid connection device for a fracturing wellhead and its usage method to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A rapid connection device for a fracturing wellhead includes, from top to bottom, an upper joint, a swivel joint, a base, and an oil production wellhead. An inner mounting seat is fixedly arranged inside the swivel joint. A hydraulic cylinder is installed inside the inner mounting seat. An inner screw sleeve is rotatably installed under the swivel joint in a limited manner. The inner screw sleeve is connected to the upper end of the base. A plug is arranged at the upper end opening of the base for primary sealing of the wellhead. A butterfly valve plate is arranged at the lower end opening of the base for secondary sealing of the wellhead. An isolation seat is fixedly arranged inside the base. The lower end of the plug is fixedly connected to a column. The lower end of the column extends into the isolation seat and is fixedly connected to a limit disk. A return spring is fixedly arranged at the lower end of the limit disk. Push components are arranged at both the front and rear ends of the limit disk. The push components are connected to a rotating component. The butterfly valve plate is driven by the rotating component to perform a 90° up and down flipping movement.

[0006] An annular biting groove is formed at the lower end of the side wall of the plug. Inside the base, multiple groups of first driven bars, second driven bars, and third driven bars are arranged in an annular array. The first driven bar, the second driven bar, and the third driven bar are all pushed by a linkage assembly and move linearly up and down. A first locking assembly for limiting the up and down movement of the plug and a first stopping assembly for limiting the bottom of the butterfly valve plate are sequentially arranged at the upper and lower ends of the first driven bar; a second locking assembly for limiting the up and down movement of the plug and a second stopping assembly for limiting the bottom of the butterfly valve plate are sequentially arranged at the upper and lower ends of the second driven bar; a third locking assembly for limiting the up and down movement of the plug and a third stopping assembly for limiting the bottom of the butterfly valve plate are sequentially arranged at the upper and lower ends of the third driven bar.

[0007] Preferably, an external thread matching the internal sleeve is formed on the outer wall of the upper end of the base. The upper end of the internal sleeve extends into the adapter and is fixedly connected with a limiting ring. The lower end of the adapter is connected to the linkage assembly. The linkage assembly includes small push rods, medium push rods, and large push rods arranged in an annular array. There are two sets of small push rods, medium push rods, and large push rods, and they are all centrosymmetric.

[0008] Preferably, one end of the small push rod is fixedly connected to the adapter, and the other end of the small push rod extends into the base and abuts against the first driven bar. One end of the medium push rod is fixedly connected to the adapter, and the other end of the medium push rod extends into the base and abuts against the second driven bar. One end of the large push rod is fixedly connected to the adapter, and the other end of the large push rod extends into the base and abuts against the third driven bar. A side stop block is fixedly connected to the middle of the side walls of the first driven bar, the second driven bar, and the third driven bar. A second spring is fixedly arranged on the lower end surface of each group of side stop blocks.

[0009] Preferably, the first locking assembly includes a first upper U-shaped frame, the second locking assembly includes a second upper U-shaped frame, and the third locking assembly includes a third upper U-shaped frame. First upper inclined grooves, second upper inclined grooves, and third upper inclined grooves are respectively formed through the first upper U-shaped frame, the second upper U-shaped frame, and the third upper U-shaped frame. Upper abutting blocks inserted into the annular biting groove are fixedly connected to the side walls of the first upper U-shaped frame, the second upper U-shaped frame, and the third upper U-shaped frame; the heights of the first upper inclined groove, the second upper inclined groove, and the third lower inclined groove increase in sequence; and upper cylindrical pins are inserted into the first upper inclined groove, the second upper inclined groove, and the third upper inclined groove. The upper cylindrical pins are fixedly connected to upper vertical blocks, and a group of upper vertical blocks are fixedly connected to the tops of the first driven bar, the second driven bar, and the third driven bar.

[0010] Preferably, the first stop component includes a first lower portal frame, the second stop component includes a second lower portal frame, and the third stop component includes a third lower portal frame. The first lower portal frame, the second lower portal frame, and the third lower portal frame are all provided with a first lower inclined groove, a second lower inclined groove, and a third lower inclined groove. Lower abutting blocks that abut against the bottom of the butterfly valve plate are fixedly connected to the side walls of the first lower portal frame, the second lower portal frame, and the third lower portal frame; the heights of the first lower inclined groove, the second lower inclined groove, and the third lower inclined groove increase in sequence, and lower cylindrical pins are inserted into the first lower inclined groove, the second lower inclined groove, and the third lower inclined groove. The lower cylindrical pins are fixedly connected to lower vertical blocks, and a group of lower vertical blocks are fixedly connected to the bottoms of the first driven bar, the second driven bar, and the third driven bar.

[0011] Preferably, the piston rod of the hydraulic cylinder extends downward and is in abutting connection with the top of the plug. The pushing component includes an L-shaped push rod. One end of the L-shaped push rod is fixedly connected to a limit disk, and the other end of the L-shaped push rod is in abutting connection with the rotating component.

[0012] Preferably, the rotating component includes an upper top plate, a first spring, a vertical rack, and a central shaft. The upper top plate is installed in the base in a limited sliding manner. The upper end of the upper top plate is in abutting connection with the bottom of the L-shaped push rod, and a first spring is fixedly arranged at the lower end of the upper top plate.

[0013] Preferably, a butterfly valve plate is fixedly sleeved outside the central shaft, and spur gears are coaxially fixedly connected to the ends of the central shaft. The spur gears are meshed and connected to the vertical rack, and the vertical rack is fixedly connected to the upper top plate.

[0014] Preferably, the lower end of the base is fixedly arranged on the oil production wellhead through bolts, the upper joint is fixedly arranged on the adapter through bolts, and the plug is arranged in a frustum-shaped structure that is narrow at the top and wide at the bottom.

[0015] A usage method of a quick connection device for a fracturing wellhead, the usage method comprising the following steps:

[0016] S1: Before using the equipment, first connect the upper end of the adapter to the oil pipe, then sleeved the whole on the base. At the same time, rotate the inner nut, and under the screwing action of the internal and external threads, the adapter is fixedly connected to the base. During this process, under the action of the linkage component, the limit on the plug and the butterfly valve plate is released;

[0017] S2: Activate the hydraulic cylinder to extend its piston rod downward and push the plug. The plug drives the column to move downward under the force, and the column acts on the limit disc, causing the limit disc to drive the L-shaped push rod to move downward. The L-shaped push rod moves downward and acts on the upper top plate, causing the upper top plate to compress the first spring and drive the vertical rack to move downward. The vertical rack acts on the spur gear, causing the central shaft to drive the butterfly valve plate to rotate clockwise by 90°, thus fully opening the oil production wellhead and making the upper joint, swivel joint, base and the oil production wellhead communicate with each other;

[0018] S3: Finally, smoothly carry out the fracturing and acidizing construction operations.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. By sequentially arranging a plug and a butterfly valve plate in the base of the present invention, a double-layer sealed protection device for the surface wellhead is formed. Compared with the underground sealed protection device, it can not only more effectively isolate the pressure and hazardous substances at the wellhead, reducing the risk of accidents; but also be more convenient for operation and management, realizing the rapid connection of the pipeline joint and the wellhead, thus making it easier to troubleshoot and reducing the downtime caused by repair problems.

[0021] 2. By arranging multiple groups of locking components and multiple groups of stopping components to sequentially perform multiple auxiliary positioning on the plug and the butterfly valve plate, and both the multiple groups of locking components and the multiple groups of stopping components are driven by the linkage component at the bottom of the swivel joint, it not only realizes the effect of quickly opening and closing the wellhead, but also ensures that the plug and the butterfly valve plate can only be opened or closed under the push of the linkage component, avoiding the occurrence of oil and gas leakage caused by the internal pressure of the wellhead or external forces, and greatly improving the anti-theft and safety performance of oil production.

[0022] 3. The present invention has strong mechanical linkage. By setting the upper top plate, the first spring, the vertical rack and the central shaft to cooperate with each other, the linear motion of the limit disc can be converted into the positive and negative flipping motion of the butterfly valve plate, enabling the butterfly valve plate to open or close adaptively with the motion state of the plug. Such a setting can not only reduce the operation steps, save time and labor costs; but also ensure better sealing of the wellhead, preventing leakage and pollution.

[0023] 4. By setting the external thread on the outer wall of the top of the base to cooperate with the internal screw sleeve, it is not only convenient for the quick disassembly and assembly of the swivel joint and the base, but also the connection state between the swivel joint and the base directly affects the opening and closing states of the plug and the butterfly valve plate, achieving that when the swivel joint is connected to the base, the plug and the butterfly valve plate quickly open; when the swivel joint is disconnected from the base, the plug and the butterfly valve plate quickly close. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional schematic diagram of the structure of the present invention.

[0025] Figure 2 This is a schematic diagram of the connection of the base, inner sleeve, adapter, and upper joint of the present invention.

[0026] Figure 3 This is a schematic diagram of the unconnected state of the adapter and the base of the present invention.

[0027] Figure 4 This is a schematic diagram of the connection of the adapter and the base of the present invention.

[0028] Figure 5 This is a schematic diagram of the sectional state of the base, inner sleeve, adapter, and upper joint of the present invention.

[0029] Figure 6 This is a schematic diagram of the linkage assembly and multiple groups of driven bars of the present invention.

[0030] Figure 7 This is a schematic diagram of the plug, butterfly valve plate, and rotating assembly of the present invention.

[0031] Figure 8 This is a schematic diagram of the plug, butterfly valve plate, and multiple groups of driven bars of the present invention.

[0032] Figure 9 This is a schematic diagram of the plug, butterfly valve plate, rotating assembly, and pushing assembly of the present invention.

[0033] Figure 10 This is a schematic diagram of multiple groups of driven bars, multiple groups of locking assemblies, and multiple groups of stopping assemblies of the present invention.

[0034] In the figure: 1, oil production wellhead; 2, base; 3, external thread; 4, inner sleeve; 401, limit ring; 5, adapter; 6, upper joint; 7, inner mounting seat; 8, hydraulic cylinder; 9, plug; 901, annular bite groove; 10, column; 11, limit disc; 12, return spring; 13, isolation seat; 14, L-shaped push rod; 15, upper top plate; 16, first spring; 17, vertical rack; 18, spur gear; 19, central shaft; 20, butterfly valve plate; 21, small push rod; 22, medium push rod; 23, large push rod; 24, first driven bar; 25, upper vertical block; 26, upper cylindrical pin; 27, first upper U-shaped frame; 28, upper abutting block; 29, side stop block; 30, second spring; 31, lower vertical block; 32, lower cylindrical pin; 33, first lower U-shaped frame; 34, lower abutting block; 35, second driven bar; 36, second upper U-shaped frame; 37, second lower U-shaped frame; 38, third driven bar; 39, third upper U-shaped frame; 40, third lower U-shaped frame. Detailed implementation manners

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] Please refer to Figures 1 to 10 , the present invention provides a technical solution: a rapid connection device for a fracturing wellhead, which sequentially includes an upper joint 6, a swivel joint 5, a base 2 and an oil production wellhead 1 from top to bottom. The lower end of the base 2 is fixedly arranged on the oil production wellhead 1 through bolts, the upper joint 6 is fixedly arranged on the swivel joint 5 through bolts, an inner mounting seat 7 is fixedly arranged inside the swivel joint 5, a hydraulic cylinder 8 is installed inside the inner mounting seat 7, a lower limit rotating inner screw sleeve 4 is installed below the swivel joint 5, the inner screw sleeve 4 is connected to the upper end of the base 2, a plug 9 is arranged at the upper end opening of the base 2 for primary sealing of the wellhead, and the plug 9 is arranged in a frustum-shaped structure with a narrow upper part and a wide lower part; a butterfly valve plate 20 is arranged at the lower end opening of the base 2 for secondary sealing of the wellhead; an isolation seat 13 is fixedly arranged inside the base 2, the lower end of the plug 9 is fixedly connected with a column 10, the lower end of the column 10 extends into the isolation seat 13 and is fixedly connected with a limit disk 11, a return spring 12 is fixedly arranged at the lower end of the limit disk 11, and push components are arranged at both the front and rear ends of the limit disk 11, and the push components are connected to a rotating component, and the butterfly valve plate 20 is driven by the rotating component to perform a 90° up and down flipping movement; an annular bite groove 901 is opened at the lower end side wall of the plug 9, and a plurality of groups of first driven bars 24, second driven bars 35 and third driven bars 38 distributed in an annular array are arranged inside the base 2, and the first driven bars 24, second driven bars 35 and third driven bars 38 are all pushed by a linkage component and perform linear up and down movement, and a first locking component for upper and lower limiting of the plug 9 and a first stopping component for bottom limiting of the butterfly valve plate 20 are sequentially arranged at the upper and lower ends of the first driven bar 24; a second locking component for upper and lower limiting of the plug 9 and a second stopping component for bottom limiting of the butterfly valve plate 20 are sequentially arranged at the upper and lower ends of the second driven bar 35; a third locking component for upper and lower limiting of the plug 9 and a third stopping component for bottom limiting of the butterfly valve plate 20 are sequentially arranged at the upper and lower ends of the third driven bar 38.

[0037] Furthermore, by sequentially arranging the plug 9 and the butterfly valve plate 20 inside the base 2, a double-layer sealing protection device for the above-ground wellhead is formed. Compared with the underground sealing protection device, it can not only more effectively isolate the pressure and hazardous substances at the wellhead, reducing the risk of accidents; but also be more convenient for operation and management, realizing the rapid connection of the pipeline joint and the wellhead, thus making it easier to troubleshoot and reducing the downtime caused by repair problems.

[0038] As Figure 2 , Figure 5 and Figure 6 shown, an external thread 3 that mates with the inner sleeve 4 is provided on the outer wall of the upper end of the base 2. The upper end of the inner sleeve 4 extends into the adapter 5 and is fixedly connected with a limiting ring 401. By providing the external thread 3 on the outer wall of the top of the base 2 for mating with the inner sleeve 4, it is not only convenient for the quick disassembly and assembly of the adapter 5 and the base 2, but also the connection state between the adapter 5 and the base 2 directly affects the opening and closing states of the plug 9 and the butterfly valve plate 20, achieving that when the adapter 5 is connected to the base 2, the plug 9 and the butterfly valve plate 20 quickly open; when the adapter 5 is disconnected from the base 2, the plug 9 and the butterfly valve plate 20 quickly close. The lower end of the adapter 5 is connected to a linkage assembly. The linkage assembly includes small push rods 21, medium push rods 22, and large push rods 23 that are distributed in an annular array. There are two sets of small push rods 21, medium push rods 22, and large push rods 23, and they are all centrosymmetric. One end of the small push rod 21 is fixedly connected to the adapter 5, and the other end of the small push rod 21 extends into the base 2 and is in contact connection with the first driven bar 24. One end of the medium push rod 22 is fixedly connected to the adapter 5, and the other end of the medium push rod 22 extends into the base 2 and is in contact connection with the second driven bar 35. One end of the large push rod 23 is fixedly connected to the adapter 5, and the other end of the large push rod 23 extends into the base 2 and is in contact connection with the third driven bar 38. And a side block 29 is fixedly connected to the middle of the side walls of the first driven bar 24, the second driven bar 35, and the third driven bar 38. A second spring 30 is fixedly provided on the lower end surface of each group of side blocks 29.

[0039] Furthermore, the lengths of the small push rod 21, the medium push rod 22, and the large push rod 23 increase in sequence. The advantage of this setting is that under the action of the same thrust, the displacement lengths of the first driven bar 24, the second driven bar 35, and the third driven bar 38 also increase in sequence, so as to simultaneously push multiple groups of stop components and multiple groups of locking components, thereby facilitating the quick unlocking of the plug 9 and the butterfly valve plate 20;

[0040] By setting multiple groups of locking components and multiple groups of stop components to perform multiple auxiliary positionings on the plug 9 and the butterfly valve plate 20 in sequence, and multiple groups of locking components and multiple groups of stop components are all driven by the linkage assembly at the bottom of the adapter 5, it not only achieves the effect of quickly opening and closing the wellhead, but also ensures that the plug 9 and the butterfly valve plate 20 can only be opened or closed under the push of the linkage assembly, avoiding the occurrence of oil and gas leakage caused by the internal pressure or external force of the wellhead, and greatly improving the anti-theft and safety performance of oil production.

[0041] As Figure 6 and Figure 10As shown, the first locking component includes the first upper U-shaped frame 27, the second locking component includes the second upper U-shaped frame 36, and the third locking component includes the third upper U-shaped frame 39. The first upper U-shaped frame 27, the second upper U-shaped frame 36, and the third upper U-shaped frame 39 are all provided with a first upper inclined groove, a second upper inclined groove, and a third upper inclined groove running through them. Upper abutting blocks 28 inserted into the annular biting groove 901 are fixedly connected to the side walls of the first upper U-shaped frame 27, the second upper U-shaped frame 36, and the third upper U-shaped frame 39. The heights of the first upper inclined groove, the second upper inclined groove, and the third upper inclined groove increase in sequence. And upper cylindrical pins 26 are inserted into the first upper inclined groove, the second upper inclined groove, and the third upper inclined groove. The upper cylindrical pins 26 are fixedly connected to upper vertical blocks 25. A group of upper vertical blocks 25 are fixedly connected to the tops of the first driven bar 24, the second driven bar 35, and the third driven bar 38.

[0042] Furthermore, since the heights of the first upper inclined groove, the second upper inclined groove, and the third upper inclined groove increase in sequence, the longitudinal thrust required for the first upper U-shaped frame 27, the second upper U-shaped frame 36, and the third upper U-shaped frame 39 to move horizontally also increases in sequence, thereby increasing the difficulty of synchronously opening the plug 9 by external force.

[0043] As Figure 6 and Figure 10 shown, the first stopping component includes the first lower U-shaped frame 33, the second stopping component includes the second lower U-shaped frame 37, and the third stopping component includes the third lower U-shaped frame 40. The first lower U-shaped frame 33, the second lower U-shaped frame 37, and the third lower U-shaped frame 40 are all provided with a first lower inclined groove, a second lower inclined groove, and a third lower inclined groove running through them. Lower abutting blocks 34 abutting against the bottom of the butterfly valve plate 20 are fixedly connected to the side walls of the first lower U-shaped frame 33, the second lower U-shaped frame 37, and the third lower U-shaped frame 40. The heights of the first lower inclined groove, the second lower inclined groove, and the third lower inclined groove increase in sequence. And lower cylindrical pins 32 are inserted into the first lower inclined groove, the second lower inclined groove, and the third lower inclined groove. The lower cylindrical pins 32 are fixedly connected to lower vertical blocks 31. A group of lower vertical blocks 31 are fixedly connected to the bottoms of the first driven bar 24, the second driven bar 35, and the third driven bar 38.

[0044] Furthermore, since the heights of the first lower inclined groove, the second lower inclined groove, and the third lower inclined groove increase in sequence, the longitudinal thrust required for the first lower U-shaped frame 33, the second lower U-shaped frame 37, and the third lower U-shaped frame 40 to move horizontally also increases in sequence, thereby increasing the difficulty of synchronously opening the butterfly valve plate 20 by external force.

[0045] As Figure 4 and Figure 9 shown, the piston rod of the hydraulic cylinder 8 extends downward and is in abutting connection with the top of the plug 9. The pushing component includes an L-shaped push rod 14. One end of the L-shaped push rod 14 is fixedly connected to a limit disc 11, and the other end of the L-shaped push rod 14 is in abutting connection with the rotating component.

[0046] Specifically, by activating the hydraulic cylinder 8 to extend its piston rod downward and push the plug 9, the plug 9 drives the column 10 to move downward under force. The column 10 acts on the limit disk 11, causing the limit disk 11 to drive the L-shaped push rod 14 to move downward. The L-shaped push rod 14 moves downward and acts on the upper top plate 15, causing the upper top plate 15 to compress the first spring 16 and drive the vertical rack 17 to move downward. The vertical rack 17 acts on the spur gear 18, causing the central shaft 19 to drive the butterfly valve plate 20 to rotate clockwise by 90°, thus achieving the purpose of opening the oil production wellhead 1.

[0047] Such as Figure 7 and Figure 9 As shown, the rotating assembly includes an upper top plate 15, a first spring 16, a vertical rack 17, and a central shaft 19. The upper top plate 15 is installed in the base 2 in a limited sliding manner. The upper end of the upper top plate 15 is in contact connection with the bottom of the L-shaped push rod 14, and the first spring 16 is fixedly arranged at the lower end of the upper top plate 15. A butterfly valve plate 20 is fixedly sleeved outside the central shaft 19. Spur gears 18 are coaxially fixedly connected to the ends of the central shaft 19. The spur gears 18 are meshed with the vertical rack 17, and the vertical rack 17 is fixedly connected to the upper top plate 15.

[0048] Furthermore, by setting the upper top plate 15, the first spring 16, the vertical rack 17, and the central shaft 19 to cooperate, the linear motion of the limit disk 11 can be converted into the forward and reverse rotational motion of the butterfly valve plate 20, enabling the butterfly valve plate 20 to open or close adaptively according to the motion state of the plug 9. This setting not only reduces the operation steps, saves time and labor costs, but also ensures better sealing of the wellhead, preventing leakage and pollution.

[0049] Before using the device, first connect the upper joint 6, connect the upper end of the adapter 5 to the oil pipe, then sleeved the whole on the base 2. At the same time, rotate the inner sleeve 4. Under the screwing action of the internal and external threads 3, the adapter 5 continuously approaches the base 2 until they fit together. During this process, the large push rod 23, the medium push rod 22 and the small push rod 21 successively extend into the base 2 and sequentially push the third driven bar 38, the second driven bar 35 and the first driven bar 24, so that the third driven bar 38, the second driven bar 35 and the first driven bar 24 drive the upper vertical blocks 25 and the lower vertical blocks 31 thereon to move downward in sequence, thereby driving multiple groups of upper vertical blocks 25 and multiple groups of lower vertical blocks 31 to move downward. The upper cylindrical pins 26 on the upper vertical blocks 25 act on the first upper inclined groove, the second upper inclined groove and the third upper inclined groove, and the lower cylindrical pins 32 on the lower vertical blocks 31 act on the first lower inclined groove, the second lower inclined groove and the third lower inclined groove, so that multiple groups of upper portal frames and multiple groups of lower portal frames move synchronously. At this time, multiple groups of upper abutting blocks 28 are quickly withdrawn from the annular biting groove 901, so as to release the limiting effect on the plug 9, and multiple groups of lower abutting blocks 34 retract inward and release the bottom limiting effect on the butterfly valve plate 20;

[0050] Next, start the hydraulic cylinder 8 to make its piston rod extend downward and push the plug 9. The plug 9 drives the column 10 to move downward under force. The column 10 acts on the limit disk 11, so that the limit disk 11 drives the L-shaped push rod 14 to move downward. The L-shaped push rod 14 moves downward and acts on the upper top plate 15, so that the upper top plate 15 squeezes the first spring 16 and drives the vertical rack 17 to move downward. The vertical rack 17 acts on the spur gear 18, so that the central shaft 19 drives the butterfly valve plate 20 to rotate clockwise by 90°, thus completely opening the oil production wellhead 1, making the upper joint 6, the adapter 5, the base 2 and the oil production wellhead 1 communicate with each other, and making the fracturing and acidizing construction operations proceed smoothly.

[0051] A method for using a quick connection device for a fracturing wellhead, the method comprising the following steps:

[0052] S1: Before using the device, first connect the upper end of the adapter 5 to the oil pipe, then sleeved the whole on the base 2. At the same time, rotate the inner nut 4. Under the screwing action of the internal and external threads 3, the adapter 5 is fixedly connected to the base 2. During this process, under the action of the linkage assembly, the limit on the plug 9 and the butterfly valve plate 20 is released; S2: By opening the hydraulic cylinder 8 to make its piston rod extend downward and push the plug 9, the plug 9 drives the column 10 to move downward under force. The column 10 acts on the limit disk 11, causing the limit disk 11 to drive the L-shaped push rod 14 to move downward. The L-shaped push rod 14 moves downward and acts on the upper top plate 15, causing the upper top plate 15 to compress the first spring 16 and drive the vertical rack 17 to move downward. The vertical rack 17 acts on the spur gear 18, causing the central shaft 19 to drive the butterfly valve plate 20 to rotate clockwise by 90°, thus completely opening the oil production wellhead 1, making the upper joint 6, the adapter 5, the base 2 and the oil production wellhead 1 communicate with each other; S3: Finally, the fracturing and acidizing construction operations are carried out smoothly. This method can improve the fracturing efficiency of oil wells.

[0053] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A quick connection device for a fracturing wellhead, which successively includes an upper joint (6), a swivel joint (5), a base (2) and an oil production wellhead (1) from top to bottom, and is characterized in that: Inside the adapter (5), an inner mounting seat (7) is fixedly arranged. Inside the inner mounting seat (7), a hydraulic cylinder (8) is installed. Below the adapter (5), an inner screw sleeve (4) is rotatably mounted with a limit. The inner screw sleeve (4) is connected to the upper end of the base (2). At the upper end opening of the base (2), a plug (9) is provided for primary sealing of the wellhead. At the lower end opening of the base (2), a butterfly valve plate (20) is provided for secondary sealing of the wellhead. Inside the base (2), an isolation seat (13) is fixedly arranged. The lower end of the plug (9) is fixedly connected to a column (10). The lower end of the column (10) extends into the isolation seat (13) and is fixedly connected to a limit disk (11). A return spring (12) is fixedly arranged at the lower end of the limit disk (11). Push components are arranged at both the front and rear ends of the limit disk (11). The push components are connected to a rotating component. The butterfly valve plate (20) is driven by the rotating component to perform a 90° up-and-down flipping movement. At the lower end of the side wall of the plug (9), an annular biting groove (901) is opened. Inside the base (2), multiple groups of first driven bars (24), second driven bars (35), and third driven bars (38) are arranged in an annular array. The first driven bar (24), the second driven bar (35), and the third driven bar (38) are all pushed by a linkage component and perform linear up-and-down movement. At the upper and lower ends of the first driven bar (24), a first locking component for limiting the up-and-down movement of the plug (9) and a first stopping component for limiting the bottom of the butterfly valve plate (20) are arranged in sequence. At the upper and lower ends of the second driven bar (35), a second locking component for limiting the up-and-down movement of the plug (9) and a second stopping component for limiting the bottom of the butterfly valve plate (20) are arranged in sequence. At the upper and lower ends of the third driven bar (38), a third locking component for limiting the up-and-down movement of the plug (9) and a third stopping component for limiting the bottom of the butterfly valve plate (20) are arranged in sequence.

2. The rapid connection device for a fracturing wellhead according to claim 1, characterized in that: On the outer wall of the upper end of the base (2), an external thread (3) matching the inner screw sleeve (4) is opened. The upper end of the inner screw sleeve (4) extends into the adapter (5) and is fixedly connected to a limit ring (401). The lower end of the adapter (5) is connected to a linkage component. The linkage component includes small push rods (21), medium push rods (22), and large push rods (23) arranged in an annular array. Two sets of small push rods (21), medium push rods (22), and large push rods (23) are provided and are all centrosymmetric.

3. The quick connection device for a fracturing wellhead according to claim 2, characterized in that: One end of the small push rod (21) is fixedly connected to the adapter (5), and the other end of the small push rod (21) extends into the base (2) and is in contact connection with the first driven bar (24). One end of the medium-sized push rod (22) is fixedly connected to the adapter (5), and the other end of the medium-sized push rod (22) extends into the base (2) and is in contact connection with the second driven bar (35). One end of the large push rod (23) is fixedly connected to the adapter (5), and the other end of the large push rod (23) extends into the base (2) and is in contact connection with the third driven bar (38). The middle parts of the side walls of the first driven bar (24), the second driven bar (35), and the third driven bar (38) are fixedly connected with side stoppers (29), and a second spring (30) is fixedly arranged on the lower end surface of each group of side stoppers (29).

4. The quick connection device for a fracturing wellhead according to claim 3, wherein: The first locking component includes a first upper U-shaped frame (27), the second locking component includes a second upper U-shaped frame (36), and the third locking component includes a third upper U-shaped frame (39). The first upper U-shaped frame (27), the second upper U-shaped frame (36), and the third upper U-shaped frame (39) are all provided with a first upper inclined slot, a second upper inclined slot, and a third upper inclined slot. Upper abutting blocks (28) inserted into the annular biting groove (901) are fixedly connected to the side walls of the first upper U-shaped frame (27), the second upper U-shaped frame (36), and the third upper U-shaped frame (39). The heights of the first upper inclined slot, the second upper inclined slot, and the third upper inclined slot increase in sequence. And upper cylindrical pins (26) are inserted into the first upper inclined slot, the second upper inclined slot, and the third upper inclined slot. The upper cylindrical pins (26) are fixedly connected to upper vertical blocks (25), and a group of upper vertical blocks (25) are fixedly connected to the tops of the first driven bar (24), the second driven bar (35), and the third driven bar (38).

5. A rapid connection device for a fracturing wellhead according to claim 4, characterized in that: The first stop component includes a first lower U-shaped frame (33), the second stop component includes a second lower U-shaped frame (37), and the third stop component includes a third lower U-shaped frame (40). The first lower U-shaped frame (33), the second lower U-shaped frame (37), and the third lower U-shaped frame (40) are all provided with a first lower inclined slot, a second lower inclined slot, and a third lower inclined slot. Lower abutting blocks (34) abutting against the bottom of the butterfly valve plate (20) are fixedly connected to the side walls of the first lower U-shaped frame (33), the second lower U-shaped frame (37), and the third lower U-shaped frame (40). The heights of the first lower inclined slot, the second lower inclined slot, and the third lower inclined slot increase in sequence, and lower cylindrical pins (32) are inserted into the first lower inclined slot, the second lower inclined slot, and the third lower inclined slot. The lower cylindrical pins (32) are fixedly connected to lower vertical blocks (31), and a group of lower vertical blocks (31) are fixedly connected to the bottoms of the first driven bar (24), the second driven bar (35), and the third driven bar (38).

6. The quick connection device for a fracturing wellhead according to claim 5, wherein: The piston rod of the hydraulic cylinder (8) extends downward and is in contact connection with the top of the plug (9). The pushing component includes an L-shaped push rod (14). One end of the L-shaped push rod (14) is fixedly connected to the limiting disc (11), and the other end of the L-shaped push rod (14) is in contact connection with the rotating component.

7. The quick connection device for a fracturing wellhead according to claim 6, wherein: The rotating assembly includes an upper top plate (15), a first spring (16), a vertical rack (17), and a central shaft (19). The upper top plate (15) is installed in the base (2) in a limited sliding manner. The upper end of the upper top plate (15) is in contact connection with the bottom of the L-shaped push rod (14), and the first spring (16) is fixedly arranged at the lower end of the upper top plate (15).

8. A rapid connection device for a fracturing wellhead according to claim 7, characterized in that: A butterfly valve plate (20) is fixedly sleeved outside the central shaft (19). Straight gears (18) are coaxially and fixedly connected to the ends of the central shaft (19). The straight gears (18) are meshed and connected to the vertical rack (17), and the vertical rack (17) is fixedly connected to the upper top plate (15).

9. The quick connection device for a fracturing wellhead according to claim 8, characterized in that: The lower end of the base (2) is fixedly arranged on the oil production wellhead (1) through bolts. The upper joint (6) is fixedly arranged on the swivel joint (5) through bolts. The plug (9) is arranged in a frustum-shaped structure with a narrow upper part and a wide lower part.

10. A method for using the rapid connection device for a fracturing wellhead as described in claim 9, characterized in that: The usage method includes the following steps: S1: Before using the equipment, first connect the upper end of the swivel joint (5) to the oil pipe, and then sleeved the whole on the base (2). At the same time, rotate the inner nut (4). Under the screwing action of the internal and external threads (3), the swivel joint (5) is fixedly connected to the base (2). During this process, under the action of the linkage assembly, the limiting effects on the plug (9) and the butterfly valve plate (20) are released; S2: By opening the hydraulic cylinder (8) to make its piston rod extend downward and push the plug (9), the plug (9) drives the column (10) to move downward under the force. The column (10) acts on the limit disc (11), so that the limit disc (11) drives the L-shaped push rod (14) to move downward. The L-shaped push rod (14) moves downward and acts on the upper top plate (15), so that the upper top plate (15) squeezes the first spring (16) and drives the vertical rack (17) to move downward. The vertical rack (17) acts on the straight gear (18), so that the central shaft (19) drives the butterfly valve plate (20) to rotate clockwise by 90°, thus completely opening the oil production wellhead (1) and making the upper joint (6), the swivel joint (5), the base (2) and the oil production wellhead (1) communicate with each other; S3: Finally, smoothly carry out the fracturing and acidizing construction operations.

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