An automatic sand mixing skid and a working method of a manifold system using the same

Abstract

This invention discloses an automatic sand mixing skid and a working method for a manifold system using the same, belonging to the technical field of oil drilling equipment. The device includes a base on which a mixing system assembly is mounted. The mixing system assembly is connected to a manifold system for liquid inlet and discharge, and is also connected to a liquid addition system, a dry addition system, and a sand conveying device for transporting sand. A protective platform assembly is also mounted on the base. Through optimized structural design, this invention utilizes a movable / sliding pump assembly to rapidly improve maintenance / repair efficiency within a limited space. The auxiliary equipment enables rapid movement of the entire pump assembly, effectively enhancing both maintenance safety and overall maintenance efficiency.

Description

Technical Field

[0001] This invention relates to an automatic sand mixing skid and a working method for a manifold system using the same, belonging to the technical field of oil drilling equipment. Background Technology

[0002] In modern oil and gas development, fracturing technology is often used to modify reservoirs. Among these technologies, the sand mixing skid is the core and soul of fracturing equipment. Its level of sophistication and reliability determines the fracturing equipment's operational capabilities and the overall effectiveness of the fracturing operation.

[0003] Traditional sand mixing systems have the following technical drawbacks:

[0004] 1. Traditional sand mixing systems use diesel engines as the power source, which are difficult to maintain, noisy, have limited space, complex structure, and are not easy to maintain. In addition, the single mixing tank and single discharge pump design has low reliability and is difficult to meet the high-intensity continuous construction requirements of unconventional oil and gas multi-well platforms.

[0005] 2. Traditional sand mixing systems use hydraulics as the power source and control terminal for the suction pump, discharge pump and agitator. Structurally, there is an additional hydraulic system. Its hydraulic end and hydraulic pipeline layout are complex, maintenance is difficult, and hydraulic oil leakage can easily cause pollution. At the same time, hydraulic motors have slow response, are difficult to adjust the speed quickly, and are not easy to maintain a stable speed. Therefore, they are difficult to adapt to the increasingly sophisticated fracturing construction requirements. Summary of the Invention

[0006] The purpose of this invention is to address the aforementioned problems by providing an automatic sand mixing skid and a manifold system operating method thereof, which can effectively improve the maintenance efficiency of the discharge pump assembly and further enhance the safety factor and maintenance efficiency of the entire equipment.

[0007] The technical solution adopted in this invention is as follows:

[0008] An automatic sand mixing skid includes a base on which a mixing system assembly is mounted. The mixing system assembly is connected to a manifold system for liquid inlet and discharge. The mixing system assembly is also connected to a liquid addition system, a dry addition system, and a sand conveying device for conveying sand. The base is also equipped with a protective frame assembly.

[0009] The manifold system includes an inhalation pump assembly and an exhaust pump assembly, which are located on both sides of the middle of the base. The inhalation pump assembly and / or exhaust pump assembly can be moved out / in along the sides of the base.

[0010] Furthermore, the base is provided with a mounting seat for assembling the discharge pump assembly. The mounting seat is made of a slide rail or a slider. The discharge pump assembly is detachably mounted on the mounting seat and can slide along the mounting seat.

[0011] Furthermore, the base is provided with a sliding groove on the side near the discharge pump assembly. The sliding groove matches the slide rail, and the discharge pump can be moved in / out through the matching of the sliding groove and the slide rail.

[0012] Furthermore, the slide is also provided with a pull rod for providing shielding, and one or both ends of the pull rod are detachably connected.

[0013] Furthermore, the manifold system includes a suction pump assembly and a discharge pump assembly. The suction pump assembly is connected to a suction manifold and a suction pump discharge manifold for connecting to the mixing system assembly. The discharge pump assembly is connected to a discharge pump discharge manifold and a discharge pump suction section connected to the mixing system assembly.

[0014] Furthermore, the manifold system also includes a suction-discharge interchange manifold one, a main discharge manifold, and a suction-discharge interchange manifold two. The discharge pump discharge manifold is connected to the suction-discharge interchange manifold one. One end of the suction-discharge interchange manifold one and the suction-discharge interchange manifold two are connected to the suction manifold, and the other end is connected to the main discharge manifold. Valves are provided on the suction-discharge interchange manifold one, the suction-discharge interchange manifold two, and the suction manifold to control the flow direction of the liquid.

[0015] Furthermore, the stirring system assembly includes a tank and a level gauge for measuring the liquid level. The tank is equipped with a stirrer assembly, a vibrating screen is also provided on the top inner side of the tank, and a drainage trough is also provided on the bottom of the tank. The angle between the drainage trough and the center line of the base is 25°–35°.

[0016] The side of the tank is also provided with an inlet pipe for liquid inlet, which is connected to the liquid outlet of the suction pump assembly.

[0017] Furthermore, the liquid addition system includes multiple screw pumps, each screw pump being connected to a pipe for drawing liquid additives and also connected to an addition pipe connected to the stirring system assembly for adding liquid materials.

[0018] Furthermore, the sand conveying device includes a support base mounted on the base, a screw conveyor mounted on the support base, a sand storage hopper mounted at the bottom of the screw conveyor, and the screw conveyor conveys the sand in the sand storage hopper to the top and then to the mixing system assembly.

[0019] Furthermore, the platform assembly includes a fixed bracket, a movable bracket, a support frame, a second tie rod, and a grid plate. The platform assembly is fixedly connected to the base. Multiple grid plates are provided on the platform assembly, and all grid plates are detachably placed on the platform assembly. The movable bracket is a detachable component and is fixedly connected to the fixed bracket and the base. The movable bracket is provided with lugs for installing the second tie rod. The support frame is also detachably fixedly connected to the base.

[0020] Furthermore, it also includes an electronic control system, which is fixedly installed on the support frame.

[0021] A method for operating a manifold system for an automatic sand mixing skid, applied to the aforementioned automatic sand mixing skid, includes the following steps:

[0022] When the manifold system is working in the forward direction, the suction and discharge manifolds are disconnected. The suction manifold serves as the suction end of the entire manifold system. The raw liquid or slickwater is pumped by the suction pump assembly and then enters the mixing system assembly through the suction pump discharge manifold. The well-mixed sand-carrying liquid is sucked from the discharge pump short section into the discharge pump assembly, and finally discharged after passing through the discharge pump discharge manifold and entering the main discharge manifold.

[0023] When the manifold system operates in reverse with the suction and discharge interchange, the second suction and discharge interchange manifold forms a passage. At this time, the discharge manifold serves as the suction end of the entire manifold system. The raw liquid or slickwater enters the suction pump assembly through the second suction and discharge interchange manifold, and then enters the mixing system assembly through the discharge manifold of the suction pump. The well-mixed sand-carrying liquid enters the discharge pump assembly from the suction section of the discharge pump. After passing through the discharge manifold of the discharge pump, the sand-carrying liquid enters the suction manifold and is finally discharged.

[0024] Furthermore, in the above steps, if maintenance of the discharge pump assembly is required, disassemble the connecting flange interfaces at both ends of the discharge pump and pull out the discharge pump assembly from the corresponding side of the base; after maintenance of the discharge pump assembly is completed, push the discharge pump assembly back in and tighten the corresponding connection parts.

[0025] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0026] 1. The present invention provides an automatic sand mixing skid and a manifold system operating method thereof. Through optimized structural design, the pump assembly is designed to move / slide outward, thereby improving the efficiency of maintenance / repair of the pump assembly in a timely manner within an effective space. The pump assembly can be moved quickly using auxiliary equipment, which effectively improves the safety of maintenance and enhances the maintenance efficiency of the entire pump assembly.

[0027] 2. The present invention provides an automatic sand mixing skid and a working method for a manifold system using the same. Through the integrated design of the internal pipes of the manifold system, the initial liquid inlet and the final liquid outlet can be interchanged according to the actual situation. Especially in its operating environment, its practicality is stronger, and it can be further rationally selected according to the setting of the on-site auxiliary accessories, thereby effectively improving the practicality of the entire sand mixing skid and further improving the working efficiency of the entire equipment.

[0028] 3. To facilitate maintenance of the manifold system, three movable grid plates are installed to facilitate maintenance of the manifold system below each corresponding grid plate. Movable supports are installed to facilitate maintenance of the manifold system near the movable supports. Removable support frames are installed to facilitate maintenance of the manifold system below the support frames, avoiding the need to dismantle all upper components and improving maintenance efficiency. Attached Figure Description

[0029] The present invention will be described by way of example and with reference to the accompanying drawings, wherein:

[0030] Figure 1 This is a perspective view of the all-electric automatic sand mixing skid of the present invention;

[0031] Figure 2 This is a perspective view of the base of the present invention;

[0032] Figure 3 This is a top view of the base of the present invention;

[0033] Figure 4 This is a perspective view of the pin connection mechanism of the present invention;

[0034] Figure 5 This is a side view of the slide groove of the present invention;

[0035] Figure 6 This is a schematic diagram of the disassembly of the discharge pump assembly of the present invention;

[0036] Figure 7 This is a three-dimensional view of the overall stirring system of the present invention;

[0037] Figure 8 This is a diagram showing the relative positions of the stirring system assembly and the base of the present invention.

[0038] Figure 9 This is a front view of the stirring system assembly of the present invention;

[0039] Figure 10 This is a bottom view of the stirring system assembly of the present invention;

[0040] Figure 11 This is a perspective view of the manifold system of the present invention;

[0041] Figure 12 This is a front view of the installation location of the manifold system of the present invention;

[0042] Figure 13 This is a three-dimensional view of the suction pump assembly of the present invention;

[0043] Figure 14 This is a perspective view of the inhalation manifold of the present invention;

[0044] Figure 15 This is a top view of the suction pump discharge manifold of the present invention;

[0045] Figure 16 This is a perspective view of the discharge manifold of the discharge pump of the present invention;

[0046] Figure 17 This is a front view of the suction section of the discharge pump of the present invention;

[0047] Figure 18 This is a three-dimensional view of the discharge pump assembly of the present invention;

[0048] Figure 19 This is a perspective view of the suction and discharge interchangeable pipe manifold of the present invention;

[0049] Figure 20 This is a perspective view of the discharge manifold of the present invention;

[0050] Figure 21 This is a two-dimensional view of the suction and discharge interchangeable manifold of the present invention;

[0051] Figure 22 This is a top view of the liquid addition system of the present invention;

[0052] Figure 23 This is a three-dimensional view of the overall frame of the present invention;

[0053] Figure 24 This is a perspective view of the stand assembly and base of the present invention;

[0054] Figure 25 This is a perspective view of the movable support frame of the present invention;

[0055] Figure 26 This is a perspective view of the support frame of the present invention;

[0056] Figure 27 This is a top view of the bench assembly of the present invention;

[0057] Figure 28 This is a perspective view of the support frame and fixing bracket of the present invention;

[0058] Figure 29 This is a perspective view of the fixing bracket and base of the present invention;

[0059] Figure 30 This is a two-dimensional view of the pull rod of the present invention;

[0060] Figure 31 This is a perspective view of the flip-up ear seat of the present invention;

[0061] Figure 32 This is a left view of the flipped ear seat of the present invention;

[0062] Figure 33a This is a schematic diagram of the working mode of the pull rod 2 of the present invention;

[0063] Figure 33b This is a schematic diagram of the second working mode of the pull rod of the present invention;

[0064] Figure 34 This is a perspective view of the sand conveying device of the present invention;

[0065] Figure 35 This is a perspective view of the electronic control system of the present invention;

[0066] Figure 36 This is a side view of the electronic control system of the present invention;

[0067] Figure 37 This is a perspective view of the dry additive system of the present invention;

[0068] The attached figures are labeled as follows:

[0069] 1 - Base, 11 - Slide rail, 12 - Tie rod one, 13 - Pin connection mechanism one, 131 - First single-ear seat, 132 - First double-ear seat, 133 - Pin shaft, 14 - Lifting lug, 15 - Slide groove, 2 - Agitator system assembly, 21 - Tank body, 211 - Drainage trough, 212 - Liquid inlet pipe, 213 - Support leg, 22 - Agitator assembly, 23 - Liquid level gauge, 24 - Vibrating screen, 3 - Manifold system, 31 - Suction pump assembly 311 - Suction pump, 312 - Suction coupling, 313 - Suction motor, 314 - Suction base, 32 - Suction manifold, 321 - 8-inch male union connector, 322 - 4-inch male union connector, 323 - Manual valve 1, 33 - Suction pump discharge manifold, 331 - Suction electric valve, 332 - Suction flow meter, 333 - Suction pressure sensor, 34 - Discharge pump discharge manifold, 341 - Discharge pressure sensor, 342 - Discharge electric valve, 343 - Pressure gauge, 344 - Discharge flow meter, 35 - Discharge pump suction section, 36 - Discharge pump assembly, 361 - Discharge pump, 362 - Discharge coupling, 363 - Discharge motor, 364 - Skid, 37 - Suction / discharge interchangeable manifold one, 371 - Tee inlet, 372 - Manual valve two, 373 - Manual valve three, 38 - Main discharge manifold, 39 - Suction / discharge interchangeable manifold two, 391 - Manual valve four 4 - Liquid addition system; 5 - Frame assembly; 51 - Fixed bracket; 52 - Movable bracket; 521 - Perforated steel plate; 522 - Second single ear seat; 53 - Support frame; 54 - Tie rod two; 541 - Square tube; 542 - Tilting ear seat; 5421 - Steel plate; 5422 - Double ear plate; 55 - Grating plate; 6 - Sand conveying device; 61 - Support seat; 62 - Screw conveyor; 63 - Sand storage hopper; 7 - Electrical control system; 8 - Dry addition system. Detailed Implementation

[0070] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0071] Any feature disclosed in this specification, unless otherwise stated, may be replaced by other equivalent or similar features. That is, unless otherwise stated, each feature is merely one example of a series of equivalent or similar features.

[0072] Example 1

[0073] An automatic sand mixing skid, such as Figure 1 The system includes a base 1, on which a stirring system assembly 2 is mounted. The stirring system assembly 2 is connected to a manifold system 3 for liquid inlet and material outlet. The stirring system assembly 2 is also connected to a liquid addition system 4, a dry addition system 8, and a sand conveying device 6 for conveying sand. The base 1 is also equipped with a protective frame assembly 5.

[0074] The manifold system 3 includes an inhalation pump assembly 31 and an exhaust pump assembly 36, which are located on both sides of the middle part of the base 1. The inhalation pump assembly 31 and / or the exhaust pump assembly 36 can be moved out / in along the sides of the base 1.

[0075] In this embodiment, the structural design takes into account the need to move the pump assembly in and out, compared to traditional structural designs. Traditional structures mainly rely on manual entry for maintenance, while this design optimizes the process by allowing the pump assembly to be moved in and out for maintenance. The manifold system 3 is a crucial component of the sand mixing skid, and its maintenance efficiency directly impacts the overall efficiency of the skid. Furthermore, personnel safety is paramount during the maintenance of large equipment. Therefore, this design employs a faster and safer movement mechanism, effectively ensuring the overall efficiency of the sand mixing skid and further improving maintenance efficiency and operator safety.

[0076] Based on the aforementioned structural design, as a more specific design, the base 1 is provided with a mounting seat for assembling the discharge pump assembly 36. The mounting seat is made of a slide rail 11 or a slider. The discharge pump assembly 36 is detachably mounted on the mounting seat and can slide along it. In this design, as a specific structural design choice, the liquid flowing through the suction pump assembly 31 is mainly relatively clean water, while the liquid flowing through the discharge pump assembly 36 contains sand. When used simultaneously, the failure rate of the suction pump assembly 31 is extremely low, practically negligible, while the discharge pump 36 requires more frequent maintenance. Therefore, the design of moving the discharge pump assembly 36 in and out is preferred in this design. Of course, in a specific structural design, the suction pump assembly 31 can also be movable, or both the suction pump assembly 31 and the discharge pump assembly 36 can be movable.

[0077] Based on the aforementioned structural design, as a further design feature, a sliding groove 15 is provided on the side of the base 1 near the discharge pump assembly 36. The sliding groove 15 matches the slide rail 11, allowing the discharge pump 361 to be moved in / out. In this design, the two structures form an auxiliary channel for movement in / out. More specifically, the discharge pump assembly 36 moves on the slide rail 11, and during the outward movement, it passes through the sliding groove 15 to move out of the base 1, facilitating operator access. Furthermore, in terms of space utilization, additional operating space is reserved on both sides, fully realizing a shared space effect and solving the problem of reserving operating space within the entire structure.

[0078] As a more specific design feature, the slide 15 is also provided with a pull rod 12 for providing shielding, one or both ends of the pull rod 12 being detachably connected. Of course, to ensure better stability, when the discharge pump assembly 36 is assembled onto the sand mixing skid base 1, it can be detachably fixed to the base 1 using bolts or other means, thereby ensuring stability during operation.

[0079] Based on the above specific structural design, as a more specific design, the manifold system 3 includes a suction pump assembly 31 and a discharge pump assembly 36. The suction pump assembly 31 is connected to a suction manifold 32 and a suction pump discharge manifold 33 for connecting to the mixing system assembly 2. The discharge pump assembly 36 is connected to a discharge pump discharge manifold 34 and a discharge pump suction section 35 connected to the mixing system assembly 2.

[0080] As a further design, based on the above design and considering the practicality of the overall structure and its adaptability to the environment, the manifold system 3 also includes a suction-discharge interchange manifold 1 37, a main discharge manifold 38, and a suction-discharge interchange manifold 2 39. The discharge pump discharge manifold 34 is connected to the suction-discharge interchange manifold 1 37. One end of the suction-discharge interchange manifold 1 37 and the suction-discharge interchange manifold 2 39 are connected to the suction manifold 32, and the other end is connected to the main discharge manifold 38. Valves are provided on the suction-discharge interchange manifold 1 37, the suction-discharge interchange manifold 2 39, and the suction manifold 32 to control the flow direction of the liquid. In this design, as a more specific explanation, when the inlet or outlet pipes need to be replaced according to the actual practical needs of the sand mixing skid, adjustments can be made in real time according to actual needs. In traditional structural designs, auxiliary accessories are usually adjusted according to the design of the manifold system 3. Once determined, there is no room for corresponding changes. In this design, the practicality of the entire structure is fully considered, fully demonstrating the practicality and adaptability of the manifold system 3 design, as well as its significant and outstanding effect on work efficiency.

[0081] Based on the above-mentioned specific structural design, as a further design, the stirring system assembly 2 includes a tank 21 and a level gauge 23 for measuring the liquid level. The tank 21 is equipped with a stirrer assembly 22. A vibrating screen 24 is also provided on the inner top of the tank 21. A drainage trough 211 is also provided on the bottom of the tank 21. The angle between the drainage trough 211 and the center line of the base 1 is 25°–35°.

[0082] The side of the tank 21 is also provided with a liquid inlet pipe 212 for liquid inlet, which is connected to the liquid discharge port of the suction pump 311 assembly 31.

[0083] In the specific structural design described above, as a more specific matching design, the suction section 35 of the discharge pump has an arc-shaped structure, and the angle between this arc-shaped structure and the centerline of the base 1 is 25°–35°, matching the drainage groove 211. This provides a more optimized solution for the installation space of the discharge pump assembly 36 and further ensures the technical effect of the displacement of the discharge pump assembly 36. Regarding the specific angle selection, 28°, 29°, or 30° is preferred.

[0084] In this embodiment, the structural design is significantly different from the traditional structure in the following ways: 1. Based on the different design of the pump assembly structure, the pump assembly is designed to be repositioned, so as to realize the rapid maintenance and upkeep of the pump assembly; 2. Based on the design of the manifold system 3, the problem of the traditional single structure is effectively changed, and the sand mixing skid can be arbitrarily switched on both sides. The inlet pipe 212 and the outlet pipe can be further adjusted according to the actual situation on site.

[0085] As a specific design feature, one side of the base 1 has a mounting base for a discharge pump assembly 36 consisting of three slide rails 11. The discharge pump assembly 36 is fixedly mounted on the slide rails 11 by bolts. The upper surface of the slide rails 11 is smooth and wear-resistant. After the fixing bolts are removed, the discharge pump assembly 36 can slide along the slide rails 11. A slide groove 15 is provided on the side of the base 1 that is close to the slide rails 11. The upper surface of the slide groove 15 is smooth and wear-resistant and coplanar with the upper surface of the slide rails 11. When the discharge pump assembly 36 slides outward from the slide rails 11, it leaves the base 1 via the slide groove 15. Above the slide groove 15 is a pull rod 12. The pull rod 12 is fixedly connected to the base 1 by a pin connection mechanism 13, which can improve the structural strength at the slide groove 15. The pin connection mechanism 13 consists of a first single ear seat 131 and a first double ear seat 132. The system consists of a lug 132 and a pin 133. The first single lug 131 is welded to both ends of the slide groove 15, and the first double lug 132 is welded to both ends of the pull rod 12. The pin 133 is inserted between the first single lug 131 and the first double lug 132 at both ends to achieve a fixed connection between the pull rod 12 and the base 1. Four lifting lugs 14 are evenly arranged on both sides of the base 1. The lifting lugs 14 can be used to lift the entire electric automatic sand mixing skid. After the pull rod 12 is removed, with all other parts of the electric automatic sand mixing skid fixed in place, the discharge pump assembly 36 can be disassembled as a whole and pulled out of the base 1 from the slide groove 15. After maintenance is completed, the discharge pump 361 assembly 36 is pushed from the slide groove 15 into the base 1 and fixed on the slide rail 11.

[0086] Example 2

[0087] Based on the above specific structural design, as a more specific design of its components, specifically the liquid addition system 4, the liquid addition system 4 includes multiple screw pumps, each screw pump is connected to a pipe for drawing liquid additives, and is also connected to an addition pipe connected to the stirring system assembly 2 for adding liquid materials.

[0088] As a specific description, the liquid addition system 4 has four screw pumps fixedly mounted on the base 11. Each screw pump draws in liquid additives from the outside through a separate pipe. At the same time, the discharge ends of all screw pumps are also connected to the mixing system assembly 2 through separate pipes (addition pipes). The required liquid additives enter the tank 21 of the mixing system assembly 2 directly from the liquid addition system 4.

[0089] Example 3

[0090] Based on the design of the above specific embodiments, as a more optimized design, the sand conveying device 6 includes a support base 61 disposed on the base 1, a screw conveyor 62 disposed on the support base 61, a sand storage hopper 63 disposed at the bottom of the screw conveyor 62, and the screw conveyor 62 conveys the sand in the sand storage hopper 63 to the top and to the mixing system assembly 2.

[0091] The sand conveying device 6 has three screw conveyors 62 fixedly installed side by side on the welded support base 61. The sand storage hopper 63 is also fixedly installed below the support base 61, and the outlet of the sand storage hopper 63 is fixedly connected to the inlet of the three screw conveyors 62. The bottom of the support base 61 is flush with the bottom of the base 1. The sand conveying device 6 can be stably placed on a flat ground and kept vertically flush with the base 1 and its upper components. In addition, the sand conveying device 6 is fixedly connected to the fixed bracket 51 on the base 1 through the pin 133, thereby achieving a fixed connection with the sand mixing skid as a whole. When the sand mixing skid is working, the sand enters the screw conveyor 62 from the sand storage hopper 63 and is then lifted by the screw conveyor 62 to the top and discharged into the mixing system assembly 2.

[0092] Example 4

[0093] In the specific structural design described above, as part of the manifold system 3, and more specifically, the entire manifold system 3 is fixedly installed on the base 1. The suction pump discharge manifold 33 is fixedly connected to the inlet pipe 212, and the discharge pump suction section 35 is fixedly connected to the drain trough 211. The suction manifold 32 and discharge manifold 38 are respectively arranged on both sides of the base 1, serving as the inlet and outlet ends of the manifold system 3, connecting to the manifolds of other external equipment. The suction pump assembly 31 is fixedly installed on one side of the end of the base 1, facilitating maintenance and repair of the suction pump assembly 31 from the outside of the automatic sand mixing skid. The pump inlet of the suction pump assembly 31 is connected to... The suction manifold 32 is fixedly connected, and the pump outlet is fixedly connected to the suction pump discharge manifold 33. The discharge pump assembly 36 is mounted on the slide rail 11 on the side of the base 1 and is fixedly connected to the drainage groove 211 of the stirring system assembly 2 through the discharge pump suction section 35. When disassembling the discharge pump assembly 36, it can be pulled out from the side of the base 1 along the slide rail 11 through the slide groove 15. The discharge end of the discharge pump assembly 36 is fixedly connected to the discharge pump discharge manifold 34, and the other end of the discharge pump discharge manifold 34 is fixedly connected to the suction and discharge interchange manifold one 37. The suction and discharge interchange manifold two 39 is used to connect the suction manifold 32 and the discharge manifold 38 and is fixedly connected to both.

[0094] The suction pump assembly 31 consists of a suction pump 311, a suction coupling 312, and a suction motor 313, all fixedly mounted on a suction base 3141. The entire suction pump assembly 31 is fixedly connected to the base 1 via the suction base 3141. The suction manifold 32 includes multiple male union ports (three 8-inch male union ports 321 and four 4-inch male union ports 322), each with its own valve. The flange at the end of the suction manifold 32 connects to the suction pump 311, the flange on the side connects to the first suction / discharge interchange manifold 37, and the side clamp connector connects to the second suction / discharge interchange manifold 39 using clamps. The first manual valve 323 is located at the front end of the suction pump 311 to close the inlet. The suction pump discharges... Manifold 33 includes an intake electric valve 331, an intake flow meter 332, and an intake pressure sensor 333. The inlet of the intake pump discharge manifold 33 is a flange connected to the discharge end of the intake pump 311, and the outlet of the intake pump discharge manifold 33 is a grooved connector connected to the inlet pipe 212 via a clamp. The discharge pump discharge manifold 34 includes a discharge pressure sensor 341, a discharge electric valve 342, a pressure gauge 343, and a discharge flow meter 344. The inlet of the discharge pump discharge manifold 34 is a flange fixedly connected to the discharge pump intake sub-section 35, and the outlet of the discharge pump discharge manifold 34 is a grooved connector connected to the tee inlet 371 of the interchangeable intake / discharge manifold 37 via a clamp. The discharge pump intake sub-section 35 is a double-flange bend straight section. The structure has an included angle of 29° between the first and second flange faces, which matches the deflection angle of the drain trough 211 relative to the base 1. The flanges at both ends of the discharge pump suction section 35 are connected to the drain trough 211 and the discharge pump discharge manifold 34, respectively. The discharge pump 361, discharge coupling 362, and discharge motor 363 of the discharge pump assembly 36 are all fixedly mounted on the skid 364 to form a whole. The skid 364 can slide in and out of the slide groove 15 along the slide rail 11, and the skid 364 can also be fixedly mounted on the slide rail 11. This structure allows for the fixed installation and quick disassembly of the discharge pump assembly 36. The suction and discharge interchange manifold 37 is generally a three-way structure, with the middle three-way inlet 371 serving as the inlet and connecting to the discharge pump discharge manifold 34. 4. The two ends of the discharge manifold are connected by clamps and equipped with manual valve 2 372 and manual valve 373 respectively. Manual valve 2 372 is fixedly connected to the suction manifold 32, and manual valve 373 is fixedly connected to the discharge manifold 38. The discharge manifold 38 has multiple male union interfaces (including 3 eight-inch male union interfaces 321 and 4 four-inch male union interfaces 322). Each male union interface is equipped with a valve. The flange on the side of the discharge manifold 38 near the end is connected to manual valve 373, and the other flange is connected to suction and discharge interchange manifold 2 39. Suction and discharge interchange manifold 2 39 is a straight pipe structure. Its straight pipe is connected to the suction manifold 32 by clamps, and manual valve 4 391 is connected to the discharge manifold.

[0095] Example 5

[0096] Based on the above-mentioned specific structural design, as a further design step, the bench assembly 5 is further optimized. The bench assembly 5 includes a fixed bracket 51, a movable bracket 52, a support frame 53, a tie rod 54, and grating plates 55. The bench assembly 5 is fixedly connected to the base 1. The bench assembly 5 has multiple (3) grating plates 55. All grating plates 55 are naturally placed on the bench assembly 5 by gravity and are not fixedly connected, making them easy to disassemble at any time. When it is necessary to inspect the manifold system 3 under the grating plate 55, the grating plate 55 can be removed separately without moving other parts of the bench assembly 5, so that personnel can enter the manifold system 3 from above. Since there are no structural components in the area covered by the grating plate 55, and it is all openwork, the manifold parts can be hoisted and replaced from the openwork. Components; the movable bracket 52 is a separately detachable component, which is bolted to the fixed bracket 51 and the base 1 through multiple (3) perforated steel plates 521, facilitating the maintenance of the manifold near the movable bracket 52. At the same time, the movable bracket 52 has a second single ear seat 522 for installing the second tie rod 54; the support frame 53 is also a separately detachable component, which is bolted to the base 1, facilitating the maintenance of the manifold below the support frame 53; in the entire platform assembly 5, only the connection between the fixed bracket 51 and the base 1 is non-detachable. At the same time, the fixed bracket 51 has a second single ear seat 522 for installing the second tie rod 54; the platform assembly 5 is located above the base 1, and the connection between the platform assembly 5 and the base 1 is an integral overhead structure. Therefore, there is a large space between the platform assembly 5 and the base 1 for arranging the manifold system 3.

[0097] The second tie rod 54 consists of two flip-up lugs 542 fixedly installed at both ends of the square tube 541. The flip-up lugs 542 are connected to the second single lug 522 via pins 133, which can fix the second tie rod 54 between the movable bracket 52 and the fixed bracket 51, serving as a structural component to strengthen the overall rigidity of the platform assembly 55. The flip-up lugs 542 consist of a steel plate 5421 and two sets of double lugs 5422, with both sets of double lugs 5422 located on the center line of the steel plate 5421 and perpendicular to each other. The second tie rod 54 is fixed to one side of the flip-up lugs 542. The second tie rod 54 has two connection methods. When the sand mixing skid is transported as a whole, the first connection method is used, and the top height of the second tie rod 54 is flush with the top height of the platform assembly 5, which will not exceed the structural height limit. When the sand mixing skid arrives at the site and is installed, the second connection method is used. At this time, the top height of the second tie rod 54 is increased, thereby increasing the head space for on-site personnel when working and moving on the grating plate 55 and avoiding head bumps.

[0098] Example 6

[0099] As a more specific design, the automated control also includes an electrical control system 7 mounted on the base 1 and matched with the frame assembly 5. The electrical control system 7 is a structure that can be hoisted independently, and its overall structure is fixedly installed on the support frame 53. Therefore, the electrical control system 7 is completely suspended relative to the base 1, which greatly increases the installation space of the manifold system 3. The electrical control system 7 integrates the personnel operating room and the frequency converter control room. All electrical equipment on the sand mixing skid is powered and controlled through the frequency converter control room of the electrical control system 77. At the same time, the operator can control the entire sand mixing skid from the operating room of the electrical control system 7. In addition, the electrical control system 7 is a closed structure that can provide shelter for personnel and equipment, and its built-in air conditioning can also create a working environment that is warm in winter and cool in summer.

[0100] Example 7

[0101] Using the automatic sand mixing skid described in Examples 1-6, a method for operating the manifold system 3 of the automatic sand mixing skid is provided, including the following steps:

[0102] When the manifold system 3 is working in the forward direction, the suction and discharge manifold 2 39 forms a circuit. The suction manifold 32 serves as the suction end of the entire manifold system 3. The raw liquid or slick water is pumped by the suction pump 311 assembly 31 and then enters the mixing system assembly 2 through the suction pump 311 discharge manifold. The well-mixed sand-carrying liquid is sucked into the discharge pump 361 assembly 36 through the discharge pump 361 short section 35. After passing through the discharge pump 361 discharge manifold 34 and entering the discharge manifold, it is finally discharged.

[0103] When the suction and discharge of manifold system 3 is reversed, the suction and discharge manifold 2 39 forms a passage. At this time, the discharge manifold serves as the suction end of the entire manifold system 3. The raw liquid or slickwater enters the suction pump 311 assembly 31 through the suction and discharge manifold 2 39, and then enters the mixing system assembly 2 through the discharge manifold of the suction pump 311. The well-mixed sand-carrying liquid is sucked into the discharge pump 361 assembly 36 through the discharge pump 361 short section 35. After passing through the discharge manifold 34 of the discharge pump 361, the sand-carrying liquid enters the suction manifold 32 and is finally discharged.

[0104] Furthermore, in the above steps, if maintenance is required on the discharge pump 361 assembly 36, the connecting flange interfaces at both ends of the discharge pump 361 are disassembled, and the discharge pump 361 assembly 36 is pulled out from the corresponding side of the base 1; after maintenance of the discharge pump 361 assembly 36 is completed, the discharge pump 361 assembly 36 is pushed back in, and the corresponding connecting parts are tightened.

[0105] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. An automatic sand mixing skid, characterized in that: The system includes a base on which a mixing system assembly is mounted. The mixing system assembly is connected to a manifold system for liquid inlet and discharge. The mixing system assembly is also connected to a liquid addition system, a dry addition system, and a sand conveying device for conveying sand. The base is also equipped with a protective frame assembly. The manifold system includes an inhalation pump assembly and an exhaust pump assembly, which are respectively disposed on both sides of the base. The inhalation pump assembly and / or the exhaust pump assembly can be moved out / in along the sides of the base. The base is provided with a mounting seat for assembling the inhalation pump assembly and / or the discharge pump assembly. The mounting seat is made of a slide rail or a slider. The inhalation pump assembly and / or the discharge pump assembly are detachably mounted on the mounting seat and can slide along the mounting seat. The base is also provided with a slide groove that matches the slide rail or slider, so that the suction pump assembly and / or discharge pump assembly can be moved out / in through the cooperation of the slide groove and the slide rail or slider; The stirring system assembly includes a tank, and a drainage trough is provided at the bottom of the tank. The center line of the drainage trough and the center line of the base are at an angle of 25°-35°.

2. The automatic sand mixing skid as described in claim 1, characterized in that: The slide or slider is also provided with a pull rod for providing shielding, and one or both ends of the pull rod are detachably connected.

3. An automatic sand mixing skid as described in claim 1, characterized in that: The manifold system includes an intake pump assembly and an exhaust pump assembly. The intake pump assembly is connected to an intake manifold and an intake pump exhaust manifold for connecting to a mixing system assembly. The exhaust pump assembly is connected to an exhaust pump exhaust manifold and an exhaust pump intake section connected to the mixing system assembly.

4. An automatic sand mixing skid as described in claim 3, characterized in that: The manifold system also includes a suction-discharge interchange manifold one, a main discharge manifold, and a suction-discharge interchange manifold two. The discharge pump discharge manifold is connected to the suction-discharge interchange manifold one. One end of the suction-discharge interchange manifold one and the suction-discharge interchange manifold two are connected to the suction manifold, and the other end is connected to the main discharge manifold. Valves are provided on the suction-discharge interchange manifold one, the suction-discharge interchange manifold two, and the suction manifold to control the flow direction of the liquid.

5. An automatic sand mixing skid as described in claim 1, characterized in that: The tank is equipped with a stirrer assembly, and a vibrating screen is also provided on the top inner side of the tank. The stirring system assembly is also equipped with a level gauge for measuring the liquid level. The side of the tank is also equipped with an inlet pipe for liquid inlet, and the inlet pipe is connected to the liquid outlet of the suction pump assembly.

6. An automatic sand mixing skid as described in claim 1, characterized in that: The liquid addition system includes multiple screw pumps, each connected to a pipe for drawing liquid additives and also connected to an addition pipe connected to a stirring system assembly for adding liquid materials.

7. An automatic sand mixing skid as described in claim 1, characterized in that: The sand conveying device includes a support base mounted on a base, a screw conveyor mounted on the support base, a sand storage hopper mounted at the bottom of the screw conveyor, and the screw conveyor conveys the sand in the sand storage hopper to the top and then to the mixing system assembly.

8. An automatic sand mixing skid as described in claim 1, characterized in that: The platform assembly includes a fixed bracket, a movable bracket, a support frame, a second tie rod, and grating plates. The platform assembly is fixedly connected to the base. Multiple grating plates are provided on the platform assembly, and all grating plates are detachably placed on the platform assembly. The movable bracket is a detachable component and is fixedly connected to the fixed bracket and the base. The movable bracket is provided with lugs for installing the second tie rod. The support frame is also detachably fixedly connected to the base.

9. An automatic sand mixing skid as described in claim 8, characterized in that: It also includes an electronic control system, which is fixedly installed on the support frame.

10. A method for operating a manifold system of an automatic sand mixing skid, applied to an automatic sand mixing skid as described in claim 4, characterized in that: Includes the following steps: When the manifold system is working in the forward direction, the suction and discharge manifolds are disconnected. The suction manifold serves as the suction end of the entire manifold system. The raw liquid or slickwater is pumped by the suction pump assembly and then enters the mixing system assembly through the suction pump discharge manifold. The well-mixed sand-carrying liquid is sucked from the discharge pump short section into the discharge pump assembly, and finally discharged after passing through the discharge pump discharge manifold and entering the main discharge manifold. When the manifold system operates in reverse with the suction and discharge interchange, the second suction and discharge interchange manifold forms a passage. At this time, the discharge manifold serves as the suction end of the entire manifold system. The raw liquid or slickwater enters the suction pump assembly through the second suction and discharge interchange manifold, and then enters the mixing system assembly through the discharge manifold of the suction pump. The well-mixed sand-carrying liquid enters the discharge pump assembly from the suction section of the discharge pump. After passing through the discharge manifold of the discharge pump, the sand-carrying liquid enters the suction manifold and is finally discharged.

11. The working method of the manifold system for an automatic sand mixing skid as described in claim 10, characterized in that: In the above steps, if maintenance is required on the discharge pump assembly, disassemble the connecting flange interfaces at both ends of the discharge pump and pull out the discharge pump assembly from the corresponding side of the base; after maintenance of the discharge pump assembly is completed, push the discharge pump assembly back in and tighten the corresponding connection parts.

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