Shale gas fracturing high-pressure manifold device

Abstract

The invention relates to the technical field of shale gas fracturing operation, in particular to a shale gas fracturing high-pressure manifold device which comprises a high-pressure combined manifold, the input end of the high-pressure combined manifold is detachably connected with a high-pressure collecting pipe with an upward opening through a flange plate, and two sets of branch pipes are symmetrically arranged on the outer side of the high-pressure collecting pipe; the tail end of each group of branch pipes is connected with a filtering unit, a sand discharging mechanism is arranged in the filtering unit, a reversing valve group is arranged in the high-pressure collecting pipe, a pneumatic executing mechanism is arranged outside the filtering unit to drive the sand discharging mechanism to act, and a hydraulically-driven spiral conveying assembly is arranged at the bottom of the filtering unit; existing equipment is blocked or damaged by impurities and needs to stop operation and maintenance, the mining efficiency is affected, and the cost is increased. The filter units are switched through the reversing valve sets, the other set continues to work when one set cleans impurities, it is guaranteed that fracturing operation is conducted continuously, the mining efficiency is improved, and the mining cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of shale gas fracturing operations, and particularly to a high-pressure pipe manifold device for shale gas fracturing. Background Art

[0002] During the process of shale gas extraction, the fracturing operation is a key link to improve the shale gas production. The fracturing operation needs to inject the fracturing fluid containing proppants into the shale formation through a high-pressure pipe manifold device to form fractures so that the shale gas can flow out smoothly.

[0003] When the current device is working, it cannot effectively filter the gravel impurities in the fracturing fluid. Inevitably, impurities such as gravel will be mixed into the fracturing fluid during transportation and storage. These impurities enter the high-pressure pipe manifold device and subsequent fracturing equipment along with the fracturing fluid, which will cause serious wear to the equipment, reduce the service life of the equipment, increase the maintenance cost of the equipment. Moreover, once the equipment is blocked or damaged due to impurities, the operation needs to be stopped for maintenance, which will seriously affect the efficiency of shale gas extraction and increase the extraction cost. Therefore, a high-pressure pipe manifold device for shale gas fracturing is proposed to facilitate the effective filtration of gravel impurities in the fracturing fluid during the fracturing operation, improve the working efficiency, ensure the continuity of the fracturing operation, and reduce the risk of equipment damage caused by impurities. Summary of the Invention

[0004] Aiming at the problems in the prior art, the present invention provides a high-pressure pipe manifold device for shale gas fracturing to facilitate the effective filtration of gravel impurities in the fracturing fluid during the fracturing operation, improve the working efficiency, ensure the continuity of the fracturing operation, and reduce the risk of equipment damage caused by impurities.

[0005] The technical solution adopted by the present invention to solve its technical problems is a high-pressure pipe manifold device for shale gas fracturing, including a high-pressure combined pipe manifold. The input end of the high-pressure combined pipe manifold is detachably connected through a flange to a high-pressure manifold pipe with an upward opening. Two groups of branch pipes are symmetrically arranged on the outer side of the high-pressure manifold pipe, and a filtering unit is connected to the end of each group of branch pipes. A sand discharging mechanism is arranged inside the filtering unit. A reversing valve group is arranged in the high-pressure manifold pipe. A pneumatic actuator is configured outside the filtering unit to drive the sand discharging mechanism to act. A hydraulically driven screw conveyor assembly is arranged at the bottom of the filtering unit.

[0006] Specifically, the filtering unit includes a filtering cylinder body communicated with the high-pressure manifold pipe, and a quick-opening maintenance gate valve is arranged at the top of the filtering cylinder body; a filtering screen plate with a conical diversion groove is horizontally installed in the filtering cylinder body, and a number of through-type filtering holes are evenly distributed on the surface of the filtering screen plate. A rotating shaft rotating seat is arranged at the center of the conical diversion groove, and a driving rotating shaft with a polygonal clamping groove is rotatably connected to the center of the rotating shaft rotating seat; the sand discharging mechanism is connected to the bottom of the filtering screen plate through a pneumatic actuator.

[0007] Specifically, the sand discharging mechanism includes a sealed sleeve with a feed inlet. A sand discharging shaft with spiral blades is installed inside the sealed sleeve. A driving boss matching a polygonal card slot is arranged at the lower end of the sand discharging shaft. A rotary sealing assembly controlled by a driving component is configured on the outer wall of the sealed sleeve.

[0008] Specifically, an annular elastic expansion pad is fixedly connected to the lower surface of the sealed sleeve. The elastic expansion pad corresponds to the rotary shaft rotating seat. A plurality of groups of diversion slits communicating with the inside of the elastic expansion pad are arranged on the outer side of the elastic expansion pad.

[0009] Specifically, the screw conveyor assembly includes a bearing seat fixed to the inner wall of the filter cylinder body. A transmission shaft with an impeller is installed on the bearing seat. A polygonal groove matching the driving boss is arranged at the top of the transmission shaft.

[0010] Specifically, the pneumatic actuator includes a first cylinder installed on the outer side of the filter cylinder body. The piston rod of the first cylinder passes through the filter cylinder body and extends into the inside of the bearing seat. A cam cooperating with the piston rod is arranged at the lower end of the transmission shaft. A one-way intake valve is connected to the first cylinder. A second cylinder is arranged at the bottom of the filter cylinder body. The piston rod of the second cylinder passes through the filter cylinder body and is connected to the filter sieve plate. The first cylinder is connected to the second cylinder through a one-way exhaust valve and a pipeline. A pressure relief valve is configured on the second cylinder. The upper side of the second cylinder is communicated with a damping exhaust valve. After the second cylinder is fully extended, it is communicated with the damping exhaust valve.

[0011] Specifically, the rotary sealing assembly includes a rotary ring slidably matched with the sealed sleeve. The rotary ring is connected to a sliding sleeve with a spiral guide. A transmission gear meshing with the driving component is installed at the top of the sliding sleeve. A spiral chute cooperating with the spiral guide is machined on the outer wall of the sealed sleeve.

[0012] Specifically, the reversing valve group includes a mounting seat arranged inside the high-pressure manifold. A driving groove is arranged inside the mounting seat. A driving gear arranged horizontally is arranged inside the driving groove. A driving motor is arranged on the outer side of the high-pressure manifold. The output end of the driving motor passes through the high-pressure manifold and the mounting seat and is fixedly connected to one side of the driving gear. The output shaft of the driving motor is rotationally connected to the high-pressure manifold.

[0013] A moving groove communicating with the driving groove is arranged inside the mounting seat. A transmission rack meshing with the driving gear is slidably connected inside the moving groove. Valve plates corresponding to the branch pipes are fixedly connected to both ends of the transmission rack. A sealing rubber ring is arranged on the side of the valve plate away from the transmission rack.

[0014] Specifically, the driving component includes a moving plate horizontally arranged on the side of the valve plate away from the transmission rack. One end of the moving plate away from the valve plate is located inside the filter cylinder and is provided with a tooth structure that meshes and drives with the transmission gear.

[0015] Specifically, the output end of the filtering unit is connected to the main manifold, and the main manifold is connected to the high-pressure output flange group through a manual gate valve.

[0016] Advantages of the present invention:

[0017] (1) For the shale gas fracturing high-pressure pipe manifold device of the present invention, when the existing equipment is blocked or damaged by impurities and needs to stop operation for maintenance, it affects the mining efficiency and increases the cost. By using the reversing valve group to switch the filtering units, while one group is cleaning impurities, the other group continues to work, ensuring the continuous progress of the fracturing operation, improving the mining efficiency, and reducing the mining cost.

[0018] (2) For the shale gas fracturing high-pressure pipe manifold device of the present invention, by setting a filter sieve plate with a conical diversion groove in the filtering unit, impurities are intercepted by the filter holes, and the impurities are gathered by means of the conical diversion groove, which is convenient for the sand discharging mechanism to clean, and the overall filtering effect is improved.

[0019] (3) For the shale gas fracturing high-pressure pipe manifold device of the present invention, through the quick-opening maintenance gate valve, pneumatic actuator, etc., it is convenient to clean and maintain the sand discharging mechanism; the design of the rotary sealing assembly is convenient for closing and opening the feeding port, with simple operation and improved convenience in using the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the drawings and embodiments.

[0021] Figure 1 is an isometric view of the present invention;

[0022] Figure 2 is a side view of the present invention;

[0023] Figure 3 is Figure 1 an enlarged view of area A of

[0024] Figure 4 is a schematic cross-sectional structure view of the filter cylinder of the present invention;

[0025] Figure 5 is Figure 4 an enlarged view of area B of

[0026] Figure 6 is Figure 4 an enlarged view of area C of

[0027] Figure 7 is a schematic structure view of the rotary sealing assembly of the present invention;

[0028] Figure 8 is Figure 7 an enlarged view of region D;

[0029] Figure 9 is a schematic cross-sectional view of the sealing sleeve of the present invention;

[0030] Figure 10 is a schematic partial cross-sectional view of the mounting seat of the present invention;

[0031] In the figure: 1, high-pressure combined manifold; 2, high-pressure manifold pipe; 3, branch pipe; 4, filter cylinder; 5, quick-opening maintenance gate valve; 6, conical flow guide groove; 7, filter sieve plate; 8, filter hole; 9, rotating shaft rotating seat; 10, driving rotating shaft; 11, polygonal card slot; 12, feed inlet; 13, sealing sleeve; 14, spiral blade; 15, sand discharge shaft; 16, driving boss; 17, elastic expansion pad; 18, flow guide gap; 19, bearing seat; 20, impeller; 21, transmission shaft; 22, polygonal groove; 23, first cylinder; 24, cam; 25, second cylinder; 26, pressure relief valve; 27, rotating ring; 28, sliding sleeve; 29, spiral guide; 30, transmission gear; 31, spiral chute; 32, mounting seat; 33, driving groove; 34, driving gear; 35, driving motor; 36, moving groove; 37, transmission rack; 38, valve plate; 39, sealing rubber ring; 40, moving plate; 41, tooth structure; 42, manifold main pipe; 43, high-pressure output flange group; 44, manual gate valve; 45 damping exhaust valve. Detailed implementation manners

[0032] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0033] In order to facilitate the effective filtration of gravel impurities in the fracturing oil during fracturing operations, improve work efficiency, ensure the continuity of fracturing operations, and reduce the risk of equipment damage caused by impurities. As an embodiment of the present invention, as Figure 1 , Figure 2 shown, a shale gas fracturing high-pressure manifold device of the present invention includes a high-pressure combined manifold 1. The input end of the high-pressure combined manifold 1 is detachably connected through a flange to a high-pressure manifold pipe 2 with an upward opening. Two groups of branch pipes 3 are symmetrically arranged on the outer side of the high-pressure manifold pipe 2. The end of each group of branch pipes 3 is connected to a filtering unit. A sand discharge mechanism is arranged inside the filtering unit. A reversing valve group is arranged in the high-pressure manifold pipe 2. A pneumatic actuator is configured outside the filtering unit to drive the sand discharge mechanism to act. A hydraulic-driven spiral conveying component is arranged at the bottom of the filtering unit.

[0034] In use, first, the input end of the high-pressure combined pipe manifold 1 is detachably connected to the high-pressure manifold pipe 2 through a flange, and two groups of branch pipes 3 are symmetrically installed on the outside of the high-pressure manifold pipe 2. The end of each group of branch pipes 3 is connected to the filtration unit to complete the basic pipeline construction work;

[0035] Next, use the reversing valve group to keep one group of filtration units connected to the high-pressure manifold pipe 2, and at the same time close the connection between the other group of filtration units and the high-pressure manifold pipe 2. Subsequently, start the relevant equipment for shale gas fracturing operations. The fracturing oil containing impurities will enter the high-pressure combined pipe manifold 1 and then flow into the high-pressure manifold pipe 2. The fracturing oil enters the corresponding filtration unit from the high-pressure manifold pipe 2 through the branch pipes 3. In the filtration unit, the impurities in the fracturing oil are effectively filtered. At the same time, the screw conveyor assembly at the bottom of the filtration unit drives the sand discharge mechanism to operate, and the sand discharge mechanism collects the impurities on the filtration unit, thereby ensuring that the filtration unit efficiently filters the gravel impurities in the fracturing oil and improving the work efficiency;

[0036] When one group of filtration units has been operating for a period of time, it is necessary to clean the impurities in the sand discharge mechanism of this group of filtration units. At this time, rely on the reversing valve group to close this group of filtration units, and at the same time open the other group of filtration units to ensure the continuity of the fracturing operation. After this group of filtration units is closed, the pneumatic actuator drives the sand discharge mechanism to move upward. When the sand discharge mechanism rises to a specific position, take it out and clean the internal impurities. After cleaning, install the sand discharge mechanism back into this filtration unit and reset the sand discharge mechanism to its initial state for subsequent continuous filtration of the fracturing oil.

[0037] For the convenience of filtering impurities such as gravel in the fracturing oil, by way of example, as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 7 、 Figure 8 shown, the present invention further includes that the filtration unit includes a filtration cylinder body 4 communicated with the high-pressure manifold pipe 2, and a quick-opening maintenance gate valve 5 is arranged at the top of the filtration cylinder body 4; a filtration screen plate 7 with a conical diversion groove 6 is horizontally installed in the filtration cylinder body 4, and a number of through-type filtration holes 8 are uniformly distributed on the surface of the filtration screen plate 7. A rotating shaft rotating seat 9 is arranged at the center of the conical diversion groove 6, and a driving rotating shaft 10 with a polygonal clamping groove 11 is rotatably connected at the center of the rotating shaft rotating seat 9; the sand discharge mechanism is connected to the bottom of the filtration screen plate 7 through a pneumatic actuator.

[0038] During use, the sand discharging mechanism is connected to the filter screen plate 7. When the fracturing oil containing impurities enters from the filter cylinder body 4 communicated with the high-pressure manifold pipe 2, under the action of gravity and pressure, the fracturing oil flows towards the horizontally installed filter screen plate 7. The through-type filter holes 8 evenly distributed on the filter screen plate 7 intercept impurities such as gravel in the fracturing oil above the filter screen plate 7, while the filtered fracturing oil flows downward through the filter holes 8 to complete the preliminary filtration.

[0039] When the fracturing oil flows along the conical diversion groove 6, it drives the gravel impurities to move towards the center of the conical diversion groove 6, and the impurities are gradually gathered at the center position of the conical diversion groove 6. It is convenient to transport the impurities entering the center position of the conical diversion groove 6 by relying on the sand discharging mechanism, so as to improve the cleaning effect and ensure the filtering effect and filtering duration of the filter screen plate 7.

[0040] When it is necessary to clean the impurities in the sand discharging mechanism of this group of filter units, rely on the reversing valve group to close this group of filter units and simultaneously open another group of filter units to ensure the continuity of the fracturing operation. Then open the quick-opening maintenance gate valve 5. At this time, the upper end of the filter cylinder body 4 is opened. Then rely on the pneumatic actuator to drive the sand discharging mechanism to move upward to a specific position, take out the sand discharging mechanism, clean the internal impurities. After cleaning, install the sand discharging mechanism back into the filter cylinder body 4 to reset the sand discharging mechanism to the initial state for subsequent continuous filtering of the fracturing oil.

[0041] In order to ensure that the filter screen plate 7 always maintains a good filtering effect, by way of example, as Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 、 Figure 7 、 Figure 8 、 Figure 9 shown, the present invention further includes that the sand discharging mechanism includes a sealing sleeve 13 with a feed inlet 12, a sand discharging shaft 15 with a spiral blade 14 is installed in the sealing sleeve 13, and a transmission boss 16 matching the polygonal card slot 11 is arranged at the lower end of the sand discharging shaft 15; a rotary sealing assembly controlled by a driving component is arranged on the outer wall of the sealing sleeve 13.

[0042] During use, first, accurately insert the transmission boss 16 at the lower end of the sand discharging shaft 15 into the polygonal card slot 11 of the driving rotating shaft 10 on the filter screen plate 7. As the transmission boss 16 gradually moves downward and is smoothly connected to the spiral conveying component, when the fracturing oil flows into this group of filter cylinder bodies 4, the pressure generated by the flow of the fracturing oil will drive the spiral conveying component to start working. During the operation of the spiral conveying component, it drives the connected transmission boss 16 to rotate, and then the sand discharging shaft 15 rotates together.

[0043] When the sand discharge shaft 15 rotates, the spiral blades 14 transport the gravel impurities on the filter screen plate 7 from the feed inlet 12 to the sealing sleeve 13, effectively cleaning the impurities on the filter screen plate 7, ensuring that the filter screen plate 7 always maintains a good filtering effect, and ensuring the efficient operation of the entire filter unit;

[0044] When it is necessary to clean the impurities accumulated in the sealing sleeve 13, the reversing valve assembly is operated to close the filter unit. At this time, the fracturing oil stops entering the filter cylinder 4, and the spiral conveying assembly no longer drives the transmission boss 16 to rotate due to the loss of the driving force of the fracturing oil. At the same time, the driving assembly drives the rotating sealing assembly to move downward to close the feed port 12 to prevent the impurities in the sealing sleeve 13 from sliding downward through the spiral blades 14 due to gravity after the spiral conveying assembly stops rotating, thereby avoiding affecting the subsequent filtering effect of the impurities in the fracturing oil.

[0045] In order to further improve the convenience of use, for example, Figure 4 , Figure 5 , Figure 7 , Figure 8 , Figure 9 As shown, the present invention also includes that the lower surface of the sealing sleeve 13 is fixedly connected with a ring-shaped elastic expansion pad 17, the elastic expansion pad 17 corresponds to the rotating shaft rotating seat 9, and the outer side of the elastic expansion pad 17 is provided with a plurality of groups of guide gaps 18 connected with the inside of the elastic expansion pad 17.

[0046] When in use, when installing the sealing sleeve 13, the lower end of the sealing sleeve 13 needs to be precisely aligned with the rotating seat 9 of the rotating shaft, and then the sealing sleeve 13 is slowly driven to move downward. During this process, it is necessary to ensure that the transmission boss 16 smoothly passes through the driving shaft 10 and is successfully connected to the spiral conveying component. When the sealing sleeve 13 moves down to its proper position, the elastic expansion pad 17 at the bottom of the sealing sleeve 13 will be compressed due to the gravity of the sealing sleeve 13 itself, and at this time, the elastic expansion pad 17 is just located inside the rotating seat 9 of the rotating shaft;

[0047] When it is necessary to clean the impurities accumulated in the sealing sleeve 13, the quick-opening inspection gate valve 5 is opened, and the pneumatic actuator drives the sand discharge mechanism to move upward as a whole. When the sand discharge mechanism rises to a specific position, the sand discharge mechanism is taken out from the equipment. In the process of taking out the sealing sleeve 13, the elastic expansion pad 17 is no longer squeezed and will gradually return to its initial state; when the elastic expansion pad 17 is reset, the suction force generated by the guide gap 18 can be used to suck part of the impurities in the center of the rotating shaft rotating seat 9 into the elastic expansion pad 17. When the sealing sleeve 13 is taken out, part of the impurities can be effectively prevented from falling into the rotating shaft rotating seat 9, thereby avoiding affecting the subsequent installation of the sealing sleeve 13, thereby further improving the convenience of use.

[0048] For the convenience of conveying the impurities on the filter sieve plate 7, exemplarily, as Figure 4 , Figure 5 shown, the present invention further includes that the screw conveyor assembly includes a bearing seat 19 fixed to the inner wall of the filter cylinder 4, the bearing seat 19 is provided with a transmission shaft 21 with an impeller 20, and a polygonal groove 22 matching the transmission boss 16 is arranged at the top of the transmission shaft 21.

[0049] During use, the transmission boss 16 at the lower end of the sand discharge shaft 15 is accurately inserted into the driving shaft 10 on the filter sieve plate 7. As the transmission boss 16 gradually moves downward, it is connected to the polygonal groove 22 on the transmission shaft 21. When the shale gas fracturing operation starts and the fracturing oil containing impurities enters the filter cylinder 4, under the impact force generated by the flow of the fracturing oil, the impeller 20 drives the transmission shaft 21 to start rotating around the bearing seat 19; the bearing seat 19 provides stable support for the transmission shaft 21 to ensure that the transmission shaft 21 can rotate smoothly and continuously. The rotation of the transmission shaft 21 drives the transmission boss 16 and the spiral blade 14 to rotate, and the spiral blade 14 is relied on to convey the crushed stones and impurities on the filter sieve plate 7 from the feed port 12 to the sealing sleeve 13, thereby conveying the impurities on the filter sieve plate 7.

[0050] Exemplarily, as Figure 1 , Figure 2 , Figure 3 , Figure 4 shown, the present invention further includes that the pneumatic actuator includes a first cylinder 23 installed on the outside of the filter cylinder 4, the piston rod of the first cylinder 23 passes through the filter cylinder 4 and extends into the bearing seat 19, a cam 24 cooperating with the piston rod is arranged at the lower end of the transmission shaft 21, and a one-way intake valve is connected to the first cylinder 23; a second cylinder 25 is arranged at the bottom of the filter cylinder 4, the piston rod of the second cylinder 25 passes through the filter cylinder 4 and is connected to the filter sieve plate 7, the first cylinder 23 is connected to the second cylinder 25 through a one-way exhaust valve and a pipeline, the second cylinder 25 is configured with a pressure relief valve 26, and a damping exhaust valve 45 is communicated with the upper side of the second cylinder 25. After the second cylinder 25 is fully extended, it is communicated with the damping exhaust valve 45.

[0051] During use, in the process of shale gas fracturing operation, when the fracturing oil enters the filter cylinder body 4, the fracturing oil drives the impeller 20 to rotate. During the rotation of the transmission shaft 21, the cam 24 on the transmission shaft 21 will periodically squeeze the piston rod of the first cylinder 23. As the cam 24 rotates, after the piston rod of the first cylinder 23 is squeezed, it supplies gas to the second cylinder 25 through a pipeline. At the same time, the impact force generated by the flow of the fracturing oil acts on the filter screen plate 7. At this time, the filter screen plate 7 cannot move upward, and the pressure inside the filter cylinder body 4 is relatively high, further causing the second cylinder 25 to be compressed; as the first cylinder 23 continuously supplies gas to the second cylinder 25, the pressure inside the second cylinder 25 gradually increases. When the pressure reaches the threshold set by the pressure relief valve 26, the gas inside the second cylinder 25 is discharged through the pressure relief valve 26 to maintain the stability of the system pressure;

[0052] When it is necessary to clean the impurities accumulated in the group of sealing sleeves 13, the operator operates the reversing valve group to close the group of filter units. At this time, the fracturing oil stops entering the group of filter cylinder bodies 4. Then, the quick-opening maintenance gate valve 5 at the top of the filter cylinder body 4 is opened to create space conditions for subsequent operations. After the quick-opening maintenance gate valve 5 is opened, the pressure inside the filter cylinder body 4 decreases, and the second cylinder 25 automatically extends. After the second cylinder 25 extends, it drives the filter screen plate 7 and the connected sealing sleeve 13 to move upward, so that the sealing sleeve 13 extends out of the filter cylinder body 4, and the operator can conveniently take out the sealing sleeve 13 and clean and discharge the impurities accumulated in the sealing sleeve 13;

[0053] After the second cylinder 25 is fully extended, it is communicated with the damping exhaust valve 45 to automatically reduce the air pressure inside the second cylinder 25, thereby reducing the supporting force of the second cylinder 25; after the impurities in the sealing sleeve 13 are cleaned, the sealing sleeve 13 is installed on the filter screen plate 7 again to restore its initial connection state, so as to facilitate the extrusion of the second cylinder 25 to contract and reset, and facilitate the downward movement of the filter screen plate 7. When the filter screen plate 7 moves down to the initial position, the transmission boss 16 on the sealing sleeve 13 will be accurately engaged with the polygonal groove 22 on the transmission shaft 21 again, thus completing the reset operation of the entire device and preparing for the subsequent filtration operation of the fracturing oil again.

[0054] Exemplarily, as Figure 7 、 Figure 8 、 Figure 9 shown, the present invention further includes that the rotary seal assembly includes a rotary ring 27 that is slidably matched with the sealing sleeve 13. The rotary ring 27 is connected to a sliding sleeve 28 with a spiral guide 29. The top of the sliding sleeve 28 is provided with a transmission gear 30 that meshes with a driving assembly. The outer wall of the sealing sleeve 13 is processed with a spiral chute 31 that cooperates with the spiral guide 29.

[0055] During use, when it is necessary to clean the impurities accumulated in the set of sealing sleeves 13, operate the reversing valve group to close the set of filtering units. At this time, the fracturing oil stops entering the set of filtering cylinders 4, and the spiral conveying assembly also stops driving the transmission boss 16 to rotate due to the loss of the driving force of the fracturing oil. At the same time, the driving assembly drives the transmission gear 30 to rotate. The transmission gear 30 starts to rotate driven by the driving assembly. Since the sliding sleeve 28 is fixedly connected to the transmission gear 30, the sliding sleeve 28 rotates accordingly; during the rotation of the sliding sleeve 28, the spiral guide 29 carried thereon cooperates with the spiral chute 31 on the outer wall of the sealing sleeve 13 to drive the sliding sleeve 28 to move downward until the feed port 12 is closed, preventing the impurities in the sealing sleeve 13 from sliding downward through the spiral blade 14 due to gravity after the spiral conveying assembly stops rotating, and avoiding affecting the subsequent filtering effect of the fracturing oil impurities;

[0056] After removing the sealing sleeve 13, the transmission gear 30 can be manually rotated to move the sliding sleeve 28 upward, and then the feed port 12 is no longer closed. At this time, the impurities accumulated in the sealing sleeve 13 can be discharged;

[0057] After all the impurities are discharged, manually rotate the transmission gear 30 again. The transmission gear 30 drives the sliding sleeve 28 to move in the reverse direction until the sliding sleeve 28 closes the feed port 12 again. After completing the above operations, install the sealing sleeve 13 back on the filter screen plate 7 to ensure that the transmission boss 16 in the sealing sleeve 13 is engaged with the polygonal groove 22 at the top of the transmission shaft 21.

[0058] Exemplarily, as Figure 1 、 Figure 5 、 Figure 10 shown, the present invention further includes that the reversing valve group includes a mounting seat 32 arranged inside the high-pressure manifold 2. A driving groove 33 is provided in the mounting seat 32. A horizontally arranged driving gear 34 is provided in the driving groove 33. A driving motor 35 is provided outside the high-pressure manifold 2. The output end of the driving motor 35 passes through the high-pressure manifold 2 and the mounting seat 32 and is fixedly connected to one side of the driving gear 34. The output shaft of the driving motor 35 is rotatably connected to the high-pressure manifold 2;

[0059] A moving groove 36 communicating with the driving groove 33 is provided in the mounting seat 32. A transmission rack 37 meshing with the driving gear 34 is slidably connected in the moving groove 36. Both ends of the transmission rack 37 are fixedly connected to valve plates 38 corresponding to the branch pipes 3. A sealing rubber ring 39 is provided on the side of the valve plate 38 away from the transmission rack 37.

[0060] During use, when it is necessary to open the passage corresponding to a certain branch pipe 3, the driving motor 35 is started. The output shaft of the driving motor 35 drives the driving gear 34 to rotate. Since the driving gear 34 meshes with the transmission rack 37, the transmission rack 37 will perform a horizontal linear motion in the moving groove 36. As the transmission rack 37 moves, the valve plate 38 corresponding to the branch pipe 3 will move accordingly, opening the passage of the branch pipe 3 and enabling the liquid to flow from the high-pressure manifold 2 to the corresponding branch pipe 3;

[0061] When it is necessary to close the passage corresponding to a certain branch pipe 3, the driving motor 35 is started in the reverse direction. The driving motor 35 drives the driving gear 34 to rotate in the reverse direction, causing the transmission rack 37 to move in the reverse direction. The valve plate 38 corresponding to the branch pipe 3 closes the passage of the branch pipe 3 as the transmission rack 37 moves in the reverse direction. At this time, the sealing rubber ring 39 on the valve plate 38 fits tightly with the interface of the branch pipe 3 to prevent liquid leakage.

[0062] For the convenience of driving the sliding sleeve 28 to move, by way of example, as Figure 4 , Figure 7 , Figure 9 , Figure 10 shown, the present invention further includes that the driving assembly includes a moving plate 40 horizontally arranged on the side of the valve plate 38 away from the transmission rack 37 and fixedly connected thereto. One end of the moving plate 40 away from the valve plate 38 is located inside the filter cylinder body 4 and is provided with a tooth structure 41 that meshes and drives with the transmission gear 30.

[0063] During use, when it is necessary to open the passage corresponding to a certain branch pipe 3, the driving motor 35 is started. Relying on the driving motor 35 to drive the transmission rack 37 and the valve plate 38 to move. When a group of valve plates 38 move, relying on the moving plate 40 and the tooth structure 41 on the group of valve plates 38 to mesh and drive with the transmission gear 30 outside the group of sealing sleeves 13, thereby driving the transmission gear 30 and the sliding sleeve 28 to rotate, so as to drive the sliding sleeve 28 to move upward and open the feed port 12 of the group of sealing sleeves 13, so as to facilitate the group of filter cylinder bodies 4 to collect impurities in the fracturing fluid;

[0064] Similarly, when the passage corresponding to a certain branch pipe 3 is opened, the passage of another branch pipe 3 drives the valve plate 38 to move under the drive of the transmission rack 37 and closes it by relying on the valve plate 38. At this time, the fracturing fluid no longer enters the group of filter cylinder bodies 4. At the same time, relying on the movement of the group of valve plates 38 to drive the moving plate 40 to move. When the moving plate 40 moves, it drives the transmission gear 30 in the group of filter cylinder bodies 4 to mesh and drive through the tooth structure 41, driving the sliding sleeve 28 to move downward until the feed port 12 is closed, preventing the impurities in the sealing sleeve 13 from sliding downward through the spiral blade 14 due to gravity after the spiral conveying assembly stops rotating, and avoiding affecting the subsequent filtering effect of the impurities in the fracturing fluid.

[0065] By way of example, asFigure 1 , Figure 2 , Figure 4 As shown in Figure 1 , Figure 2 , and Figure 4 , the present invention further includes that the output end of the filtering unit is connected to the main collecting pipe 42, and the main collecting pipe 42 is connected to the high-pressure output flange group 43 through a manual gate valve 44.

[0066] During use, in shale gas fracturing operations, when a set of filter cylinders 4 needs to be opened for work, the manual gate valve 44 at the lower end of this set of filter cylinders 4 and the main collecting pipe 42 should be opened first to ensure its smooth connection with the high-pressure output flange group 43. At the same time, the other set of filter cylinders 4 and the manual gate valve 44 and the main collecting pipe 42 at its lower end should be closed. The purpose of doing this is to effectively prevent the fracturing oil from flowing back into the other set of filter cylinders 4 through the main collecting pipe 42 during the operation of a set of filter cylinders 4. In this way, not only can it ensure that the fracturing oil obtains a good filtering effect in the currently working filter cylinders 4, but also improve the usability of the entire shale gas fracturing high-pressure pipe manifold device and ensure that the operation process is more smooth and efficient.

[0067] During the use of the present invention, a set of filtering units is kept connected to the high-pressure collecting pipe 2 by using a reversing valve group, while the connection between the other set of filtering units and the high-pressure collecting pipe 2 is closed. The equipment related to shale gas fracturing operations is started. The fracturing oil containing impurities enters the high-pressure combined pipe manifold 1, flows into the high-pressure collecting pipe 2, and then enters the corresponding filtering unit through the branch pipe 3. The fracturing oil is filtered in the filtering unit through the filtering holes 8 of the filter screen plate 7. Impurities such as gravel are intercepted above the filter screen plate 7, and the filtered fracturing oil flows downward;

[0068] When the fracturing oil flows along the conical diversion groove 6, it drives the gravel impurities to move towards the center of the conical diversion groove 6, and the impurities are gradually gathered at the center position of the conical diversion groove 6. At the same time, the fracturing oil impacts the impeller 20 of the screw conveyor assembly, driving the transmission shaft 21 to rotate, and further causing the sand discharge shaft 15 to rotate, transporting the impurities on the filter screen plate 7 from the feed port 12 to the sealing sleeve 13;

[0069] The fracturing oil drives the impeller 20 and the transmission shaft 21 to rotate. During the rotation of the transmission shaft 21, the cam 24 on the transmission shaft 21 will periodically squeeze the piston rod of the first cylinder 23. As the cam 24 rotates, the piston rod of the first cylinder 23 is squeezed and supplies gas to the second cylinder 25 through a pipeline. At the same time, the impact force generated by the flow of the fracturing oil acts on the filter screen plate 7. At this time, the filter screen plate 7 cannot move upward, and the pressure inside the filter cylinder 4 is relatively high, further causing the second cylinder 25 to be compressed; as the first cylinder 23 continuously supplies gas to the second cylinder 25, the pressure inside the second cylinder 25 gradually increases. When the pressure reaches the threshold set by the pressure relief valve 26, the gas inside the second cylinder 25 is discharged through the pressure relief valve 26 to maintain the stability of the system pressure;

[0070] After a set of filtering units have been operating for a period of time and impurities in the sand discharge mechanism need to be cleaned, operate the reversing valve group to close this set of filtering units, and at the same time open another set of filtering units to ensure the continuity of the fracturing operation. At this time, the fracturing oil stops entering the filtering cylinder body 4 of this set. After opening the quick-opening maintenance gate valve 5, the internal pressure of the filtering cylinder body 4 decreases, and the second cylinder 25 automatically extends. After the second cylinder 25 extends, it drives the filtering screen plate 7 and the connected sealing sleeve 13 to move upward, so that the sealing sleeve 13 extends out of the filtering cylinder body 4, and the operator can conveniently take out the sealing sleeve 13;

[0071] After taking out the sealing sleeve 13, the transmission gear 30 can be manually rotated to move the sliding sleeve 28 upward, and then the feed inlet 12 is no longer closed. At this time, the impurities accumulated in the sealing sleeve 13 can be discharged; when all the impurities are discharged, manually rotate the transmission gear 30 again, and the transmission gear 30 drives the sliding sleeve 28 to move in the reverse direction until the sliding sleeve 28 closes the feed inlet 12 again;

[0072] After the impurities in the sealing sleeve 13 are cleaned, install the sealing sleeve 13 on the filtering screen plate 7 again to restore its initial connection state, so as to facilitate the contraction and reset of the second cylinder 25 and the downward movement of the filtering screen plate 7. When the filtering screen plate 7 moves down to the initial position, the transmission boss 16 on the sealing sleeve 13 will be accurately engaged with the polygonal groove 22 on the transmission shaft 21 again, thus completing the reset operation of the entire equipment and preparing for the subsequent filtration operation of the fracturing oil again;

[0073] Before cleaning the impurities in the sealing sleeve 13, rely on the driving motor 35 to drive the transmission rack 37 and the valve plate 38 to move. Rely on one set of valve plates 38 to close this set of filtering units, the fracturing oil stops entering, the screw conveyor assembly stops rotating, and when the valve plate 38 moves, it drives the transmission gear 30 to rotate through the tooth structure 41, so that the sliding sleeve 28 in a set of filtering cylinder bodies 4 moves downward. Rely on the cooperation of the spiral guide 29 and the spiral chute 31 on the outer wall of the sealing sleeve 13 to close the feed inlet 12 and prevent impurities from slipping; at the same time, when the driving motor 35 drives the transmission rack 37 to move, another set of valve plates 38 opens the corresponding filtering cylinder body 4, and relies on the moving plate 40 and the tooth structure 41 on this set of valve plates 38 to mesh and drive with the transmission gear 30 in this set of filtering cylinder bodies 4, driving the sliding sleeve 28 to move upward and opening the feed inlet 12 of this set of sealing sleeves 13, so as to facilitate the impurity filtration of the fracturing oil by this set of filtering cylinder bodies 4;

[0074] During the shale gas fracturing operation, when a set of filter cylinders 4 needs to be opened for work, the manual gate valve 44 at the lower end of this set of filter cylinders 4 should be kept open to ensure the smooth connection between the filter cylinders 4 and the high-pressure output flange group 43. At the same time, when it is necessary to clean another set of filter cylinders 4, the manual gate valve 44 under this set of filter cylinders 4 should be kept closed, so as to prevent the fracturing oil from flowing back into another set of filter cylinders 4 through the manifold 42 during the operation of a set of filter cylinders 4, thereby ensuring a good filtering effect of the fracturing oil in the currently working filter cylinders 4, improving the usability of the entire shale gas fracturing high-pressure pipe manifold device, and ensuring a smoother and more efficient operation process.

[0075] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of protection required by the present invention. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A shale gas fracturing high pressure manifold device, characterized in that: The invention comprises a high-pressure combined manifold (1), wherein the input end of the high-pressure combined manifold (1) is detachably connected to a high-pressure manifold (2) with an opening facing upward via a flange, two groups of branch pipes (3) are symmetrically arranged on the outside of the high-pressure manifold (2), and the ends of each group of branch pipes (3) are connected to a filter unit, a sand discharge mechanism is arranged inside the filter unit, a reversing valve group is arranged inside the high-pressure manifold (2), a pneumatic actuator is arranged outside the filter unit to drive the sand discharge mechanism to operate, and a hydraulically driven screw conveying component is arranged at the bottom of the filter unit.

2. A shale gas fracturing high pressure manifold device according to claim 1, characterized in that: The filter unit comprises a filter cylinder (4) connected to a high-pressure manifold (2), a quick-opening inspection gate valve (5) being arranged on the top of the filter cylinder (4); a filter screen plate (7) with a conical guide groove (6) being horizontally installed in the filter cylinder (4), a plurality of through-type filter holes (8) being evenly distributed on the surface of the filter screen plate (7), a rotating shaft rotating seat (9) being arranged at the center of the conical guide groove (6), the center of the rotating shaft rotating seat (9) being rotatably connected to a driving rotating shaft (10) with a polygonal slot (11); and the sand discharge mechanism being connected to the bottom of the filter screen plate (7) via a pneumatic actuator.

3. A shale gas fracturing high pressure manifold device according to claim 2, characterized in that: The sand discharge mechanism comprises a sealing sleeve (13) with a feed port (12), a sand discharge shaft (15) with a spiral blade (14) is installed in the sealing sleeve (13), and a transmission boss (16) matching the polygonal slot (11) is arranged at the lower end of the sand discharge shaft (15); and a rotating sealing component controlled by a driving component is arranged on the outer wall of the sealing sleeve (13).

4. A shale gas fracturing high pressure manifold device according to claim 3, characterized in that: The lower surface of the sealing sleeve (13) is fixedly connected to a ring-shaped elastic expansion pad (17), the elastic expansion pad (17) corresponds to the rotating seat (9) of the rotating shaft, and the outer side of the elastic expansion pad (17) is provided with a plurality of groups of guide gaps (18) connected to the inside of the elastic expansion pad (17).

5. A shale gas fracturing high pressure manifold device according to claim 4, characterized in that: The spiral conveying assembly comprises a bearing seat (19) fixed to the inner wall of the filter cylinder (4), the bearing seat (19) being provided with a transmission shaft (21) with an impeller (20), and a polygonal groove (22) matching the transmission boss (16) being arranged at the top of the transmission shaft (21).

6. A shale gas fracturing high pressure manifold device according to claim 5, characterized in that: The pneumatic actuator comprises a first cylinder (23) mounted on the outside of the filter cylinder (4); the piston rod of the first cylinder (23) passes through the filter cylinder (4) and then extends into the interior of the bearing seat (19); a cam (24) cooperating with the piston rod is arranged at the lower end of the transmission shaft (21); and a one-way air inlet valve is connected to the first cylinder (23); a second cylinder (25) is arranged at the bottom of the filter cylinder (4); the piston rod of the second cylinder (25) passes through the filter cylinder (4) and then connects to the filter screen plate (7); the first cylinder (23) is connected to the second cylinder (25) through a one-way air outlet valve and a pipeline; the second cylinder (25) is provided with a pressure relief valve (26); the upper side of the second cylinder (25) is connected to the damping exhaust valve (45); and the second cylinder (25) is connected to the damping exhaust valve (45) after being fully extended.

7. A shale gas fracturing high pressure manifold device according to claim 6, characterized in that: The rotary seal assembly comprises a rotary ring (27) which is slidably matched with a sealing sleeve (13); the rotary ring (27) is connected to a sliding sleeve (28) with a spiral guide (29); a transmission gear (30) which is meshed with a driving assembly is installed on the top of the sliding sleeve (28); and a spiral groove (31) which is matched with the spiral guide (29) is processed on the outer wall of the sealing sleeve (13).

8. A shale gas fracturing high pressure manifold device according to claim 7, characterized in that: The reversing valve group comprises a mounting seat (32) arranged inside the high-pressure manifold (2), a driving groove (33) being arranged inside the mounting seat (32), a horizontally arranged driving gear (34) being arranged inside the driving groove (33), a driving motor (35) being arranged outside the high-pressure manifold (2), an output end of the driving motor (35) passing through the high-pressure manifold (2), the mounting seat being fixedly connected to one side of the driving gear (34), and an output shaft of the driving motor (35) being rotationally connected to the high-pressure manifold (2); The mounting seat (32) is provided with a movable groove (36) in communication with the driving groove (33); a transmission rack (37) meshing with the driving gear (34) is slidably connected in the movable groove (36); both ends of the transmission rack (37) are fixedly connected to valve plates (38) corresponding to the branch pipe (3); and a sealing rubber ring (39) is provided on a side of the valve plate (38) away from the transmission rack (37).

9. A shale gas fracturing high pressure manifold device according to claim 8, characterized in that: The driving assembly comprises a movable plate (40) fixedly connected to a side of the valve plate (38) away from the transmission rack (37) and arranged horizontally; one end of the movable plate (40) away from the valve plate (38) is located in the filter cylinder (4) and is provided with a tooth structure (41) meshing with the transmission gear (30) for transmission.

10. A shale gas fracturing high pressure manifold device according to claim 9, characterized in that: The output end of the filter unit is connected to a main confluence pipe (42), and the main confluence pipe (42) is connected (44) to a high-pressure output flange group (43) via a manual gate valve.

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