A device for efficiently sorting petroleum fracturing sand

Abstract

The present invention relates to the technical field of wet solid-solid separation equipment and methods, and specifically to a device for efficiently sorting petroleum fracturing sand. In the currently known sorting equipment, the mortar feed pipe and the water supply pipe have no matching relationship, so that the fed mortar constantly destroys the dispersion system balance that has been established and maintained in the barrel body, affecting the classification effect. The present invention includes a barrel body, a sand feed part, a water supply part, an overflow trough, and a discharge pipe; the barrel body is provided with a hemispherical water filter net; the sand feed part includes a sand feed pipe and a mixing chamber, and a pair of impellers are provided in the mixing chamber. By setting a mixing chamber and an impeller, the mortar is pre-treated, which is conducive to the mortar entering the barrel body in a more dispersed manner, avoiding the mortar from seriously damaging the dynamic equilibrium dispersion system of the barrel body, so as to improve the classification efficiency of the mortar.

Description

Technical Field

[0001] The invention relates to the technical field of wet solid-solid separation equipment and methods, and in particular to equipment for efficiently sorting petroleum fracturing sand. Background Art

[0002] At present, there are two main methods for silica sand classification in China: one is to use screens (flat shaking screens, high square screens, drum screens, vibrating screens, etc.) for classification, and the other is to use hydraulic classification (including desludging). When screening and sorting silica sand with a particle size of 0.1~1 mm (especially finer), the screen is easy to block, the classification efficiency is not high, and the screen is seriously worn. Many silica sand concentrators in China use hydraulic classification, mainly using desludging buckets or cone (or cylindrical) hydraulic classifiers with rising water flow improved from desludging buckets for desludging or classification. This hydraulic classification equipment itself has no moving parts and will not wear. To a certain extent, it can meet the requirements of various industrial sectors (especially the glass industry) for silica sand particle size; but for sectors with strict particle size requirements (such as precision casting), it is sometimes difficult to ensure quality. Spiral classifiers and hydrocyclones are only used by individual silica sand concentrators. The overflow particle size of spiral classification is not easy to control, and the rotating parts are easy to wear; the hydrocyclone is sensitive to operating conditions such as water pressure and feeding.

[0003] Most foundry sand production enterprises in my country use a series of cone hydraulic classifiers (including cylindrical hydraulic classifiers with a small cone at the bottom and a column of a certain height at the top) to continuously desludging and classifying natural silica sand through a water washing tower. Although this classifier has a simple structure, low manufacturing price and convenient operation, when used for classifying coarse particles (0.3~1 mm), due to the limitations of its structure itself, the classification effect is poor, the classified products are seriously mixed with coarse and fine particles, the particle size concentration rate is low, and unqualified products are prone to appear.

[0004] In foreign countries, silica sand classification is also mainly carried out by screening and hydraulic classification. Natural sand desludging is generally based on cyclones. When the raw sand contains very few impurities, the main operation of mineral processing is classification. In order to improve the classification effect and improve the classification efficiency, many foreign companies focus on the research and development of high-efficiency classification equipment, such as arc screens, jet classifiers, siphon classifiers and various rising water classifiers. Among them, the automatic interference sedimentation classifier and Rheax classifier have better classification effects. The Rheax classification method is widely used in Australia, Finland, Sweden, Austria, Germany, Japan and other countries due to its accurate classification.

[0005] In the process of separating sand by hydraulic classification, the sand in the water sorting equipment is first divided into three categories, namely the floating layer, the suspended layer and the sedimentation layer, which occupy the upper, middle and lower layers in the sorting container. In actual production, hydraulic classification is carried out in an obstructed sedimentation tank. Due to the characteristics of hydraulic classification, in order to achieve the classification accuracy and productivity requirements, each particle size must have a high dispersion, and a certain cross-sectional size of the equipment is guaranteed. From a theoretical analysis, under the condition of a certain water flow rate, the circulating water volume is proportional to the square of the equipment diameter. The greater the equipment processing capacity, the higher the classification accuracy, the larger the cross-sectional size of the required equipment, and the corresponding circulating water volume and power consumption are greater. For this reason, the diameter size is minimized as much as possible when designing the structure of the obstructed sedimentation tank, and the dispersion and productivity problems between each particle size are solved by increasing the height size of the equipment. Usually, the height size of the obstructed sedimentation tank is more than 3m. Due to the structural characteristics of the obstructed sedimentation tank, the equipment investment cost is large compared with the screening classification under the same classification processing capacity, and the plant infrastructure cost is high.

[0006] The advantages of hydraulic classification are: hydraulic classification achieves particle separation between different particle sizes through the buoyancy of water flow. Compared with the screening method, there is no screen in the equipment and no need to replace the screen, which reduces the maintenance cost of the equipment, reduces the labor intensity of workers and the auxiliary time of production, and ensures the continuity and stability of production. The disadvantages are: hydraulic classification is based on the characteristics of water flow to achieve particle separation between different particle sizes. Therefore, the density, shape and sedimentation conditions of the particles have an impact on the sedimentation rate. In addition, the cross-sectional size of the equipment is limited by factors such as power consumption in design. Therefore, the particle group is more mixed during classification, and there are problems such as high power consumption, low separation accuracy and low unit volume processing capacity. In addition, the operation control of hydraulic classification is relatively strict, and the control process is prone to fluctuations. Once the control factors in the production process change, it is easy to cause classification failure.

[0007] Therefore, from the above description, it can be seen that the state of the dispersion system formed by water and sand in the sorting equipment has a significant impact on the classification effect, that is, a uniform and stable dispersion system can output sand with a single particle size (referring to a certain mesh range) to a certain extent, and the accuracy of the sorted product (the proportion of sand with a specified particle size in a certain specification of sand) is also high. However, in the currently known sorting equipment, the mortar feed pipe and the water supply pipe in the single classifier (referring to the barrel of a single sorting equipment) have no matching relationship, so that the fed mortar continuously destroys the dispersion system balance that has been established and maintained in the barrel, affecting the classification effect.

[0008] Petroleum fracturing sand is a product belonging to fracturing proppant, which has high fracturing strength and is mainly used for downhole support in oil fields to increase the production of oil and gas. Fracturing proppant is made of high-quality bauxite and other raw materials, sintered with ceramics. It is a substitute for medium and low strength proppants such as natural quartz sand, glass balls, metal balls, etc., and has a good effect on increasing the production of oil and gas. During the deep well mining of oil and gas, the high closure pressure and low permeability ore deposits are treated by fracturing, so that the oil and gas-bearing rock formations are cracked, and the oil and gas are collected from the channels formed by the cracks. The ceramsite support material is used to enter the formation along with the high-pressure solution to fill the cracks in the rock formation, which plays a role in supporting the cracks from closing due to stress release, thereby maintaining high conductivity, making oil and gas unobstructed and increasing production. Practice has proved that oil wells fracturing with ceramsite proppants can increase production by 30-50%, and can also extend the service life of oil and gas wells.

[0009] Fracturing proppants can be widely used in fracturing transformation of deep wells and high-pressure oil and gas layers. Fracturing proppants product categories:

[0010] 1. According to the crushing resistance, there are four series: 52MPa (7500psi), 69MPa (10000psi), 86MPa (12500psi), 102MPa (15000psi);

[0011] 2. According to volume density, it can be divided into: low density, medium density and high density;

[0012] 3. According to the specifications, they are: 12-20 mesh, 16-20 mesh, 16-30 mesh, 20-40 mesh, 30-50 mesh, 40-60 mesh, 40-70 mesh, 70-100 mesh, etc. In order to meet the needs of domestic and foreign oil and gas wells, users can choose products of different strengths and specifications according to the depth of the oil well. Of course, the above product classification is based on the standard fracturing proppant. When natural silica sand is used as a fracturing proppant, its classification specifications, crushing strength and other indicators are also different. Summary of the invention

[0013] The main purpose of the present invention is to provide a device for efficiently sorting petroleum fracturing sand, that is, a device for hydraulically classifying natural silica sand using the device.

[0014] The above purpose is achieved by the following technical solutions:

[0015] An efficient equipment for sorting petroleum fracturing sand, hereinafter referred to as sorting equipment, is characterized by:

[0016] The sorting equipment includes a barrel, a sand feeding part, a water supply part, an overflow tank, and a discharge pipe;

[0017] The barrel body is in the shape of a barrel, with an opening at the top and a water filter net at the bottom. The water filter net is in the shape of a circular hemispherical surface and has a plurality of water filter holes.

[0018] The sand inlet part includes a sand inlet pipe and a mixing chamber. The mixing chamber is cylindrical or spherical and is provided with a pair of impellers. One side of the mixing chamber is open and connected to the side wall of the barrel, and the other side of the mixing chamber is connected to the sand inlet pipe.

[0019] The water supply part includes a water supply pipe and a water supply cavity. The water supply cavity is located at the bottom of the barrel body, and the water supply pipe is connected to the water supply cavity.

[0020] The overflow groove is located on the outside of the top of the barrel body, and the overflow groove surrounds the barrel body to form an annular groove structure. The overflow groove is provided with an overflow pipe leading outward;

[0021] The ore discharge pipe is arranged at the center of the bottom of the barrel body, passes through the water filter net and the water supply cavity, and extends downward.

[0022] The number of the sand feeding parts is 2 to 4, and all the sand feeding parts are installed at the same height of the outer wall of the barrel body, and the sand feeding parts are distributed in a centrally symmetrical star shape.

[0023] The sand inlet portion is arranged at half the height between the top of the barrel body and the upper edge of the water filter net.

[0024] The impeller is provided with an impeller shaft, an impeller body and impeller blades. The impeller shaft is horizontally arranged and its two ends are fixedly assembled in the mixing chamber. The impeller body is sleeved outside the impeller shaft. There are multiple impeller blades, all of which are fixedly mounted on the impeller body.

[0025] The impeller shafts are arranged horizontally, and the two impeller shafts are arranged longitudinally, and the impeller blades are interlaced with each other.

[0026] The sand inlet pipe is perpendicular to the plane where the two impeller shafts of the impeller are located.

[0027] The sand inlet pipe is arranged obliquely, and one end of the sand inlet pipe away from the barrel body is inclined upward.

[0028] The barrel body is provided with a flow regulating plate, which is oriented toward the center of the barrel body and tilted downward, and the flow regulating plate is provided with a support, which fixes the flow regulating plate to the inner wall of the barrel body;

[0029] There is a gap between the flow regulating plate and the inner wall of the barrel;

[0030] There are multiple flow regulating plates, and the multiple flow regulating plates are staggered along the circumferential direction and / or axial direction of the inner wall of the barrel body.

[0031] The flow regulating plate is arranged at the middle section of the barrel body.

[0032] At least two water supply pipes are provided, and all of the water supply pipes are distributed in a star shape and point to the ore discharge pipe at the center of the bottom of the barrel.

[0033] The water supply chamber extends upward along the water filter net, and the upper edge of the water supply chamber is higher than the upper edge of the water filter net.

[0034] The water supply pipe is arranged horizontally.

[0035] The ore discharge pipe extends upward, and the upper edge of the ore discharge pipe is higher than the lower edge of the water filter net and lower than the upper edge of the water filter net.

[0036] The beneficial effects of the present invention are:

[0037] (1) By setting a mixing chamber on the sand inlet pipe and setting a pair of impellers rotating in opposite directions and synchronously in the mixing chamber, the mortar with a certain impact force delivered by the sand inlet pipe is pre-treated to a certain extent, so that the mortar can be mixed and homogenized again, and the impact force generated by the delivery pipeline on the mortar can be further offset, so that the mortar entering the barrel is smooth and evenly dispersed;

[0038] (2) There are multiple sand inlet parts with mixing chambers, which are distributed in a centrally symmetrical star shape, which is conducive to the mortar entering the barrel more dispersedly, avoiding the serious damage to the dynamic equilibrium dispersion system of the barrel caused by the mortar transported by the centrally arranged sand inlet pipe of the conventional device;

[0039] (3) The separation device described in the present application is provided with a water supply part, whose water supply chamber is arranged to extend upward along the circular hemispherical water filter net, so that the clean water transported by the water supply pipe can pass through the water filter net evenly, reducing the influence of the water flow of the water supply pipe on the water flow in the barrel body, so that a nearly stable and uniform upward water flow is formed in the barrel body, and the influence of non-directional turbulence is minimized;

[0040] (4) The sorting equipment described in the present application constructs a liquid medium with a smooth flow, which is conducive to the classification of silica sand and improves the classification accuracy; in addition, the mortar entering the barrel is quickly dispersed into the liquid medium through the sand inlet part to improve the classification efficiency of the mortar. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings used in the present invention are as follows:

[0042] Figure 1 Schematic diagram of the structure of the sorting equipment in Example 1 of the present invention, in which the arrows indicate the material conveying direction, such as sand feeding, water feeding, ore discharge, overflow, etc.;

[0043] Figure 2 1 is a schematic diagram of a top view of the structure of the sorting device in Example 2 of the present invention, which mainly shows a structure of multiple sand feeding parts distributed in a star shape;

[0044] Figure 3 Schematic diagram of the structure of the sand feeding part in Example 2 of the present invention;

[0045] Figure 4is a schematic structural diagram of an inclined arrangement of a sand inlet pipe of a sand inlet portion in Embodiment 2 of the present invention;

[0046] Figure 5 is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0047] Figure 6 It is a schematic diagram of the structure of the protruding ore discharge pipe in Example 3 of the present invention.

[0048] As can be seen from the figure:

[0049] 1 barrel body 11 water filter 12 water filter hole 13 flow regulating plate 14 support

[0050] 2 sand inlet 21 sand inlet pipe 22 mixing chamber 23 impeller 24 impeller shaft 25 impeller body 26 impeller blade

[0051] 3 Water supply unit 31 Water supply pipe 32 Water supply chamber

[0052] 4 Overflow tank

[0053] 5 rows of mining pipes. DETAILED DESCRIPTION

[0054] Embodiment 1:

[0055] like Figure 1 As shown, a device for efficiently sorting petroleum fracturing sand, referred to as sorting equipment, is characterized by:

[0056] The sorting equipment includes a barrel, a sand feeding part, a water supply part, an overflow tank, and a discharge pipe;

[0057] The barrel body is in the shape of a round barrel with an opening at the upper end and a water filter net at the bottom. The water filter net is in the shape of a round hemispherical surface and is provided with a plurality of water filter holes. The water filter net mentioned here refers to a plate-like component with a large number of through holes, which is arranged at the bottom of the barrel body and closes the bottom of the barrel, so that the barrel body presents a structure with a round barrel on the upper part and a hemispherical surface on the bottom. The upper edge of the hemispherical water filter net is fixedly connected to, or integrated with, the side wall of the bottom of the barrel body.

[0058] Conventional silica sand hydraulic sorting equipment generally adopts a conical bottom with a linear outline. The large-size sand at the bottom of the barrel can be easily gathered at the top of the cone (the cone is inverted, and the top of the cone is facing downward), and the large-size sand can be quickly discharged; but conventional cone-bottom sorting equipment is not conducive to the full separation of the mortar at the bottom of the barrel, and there is serious interference during the screening process, and the separation accuracy is not very good. The sorting equipment with a hemispherical barrel bottom has an arc-shaped bottom, and the water flow entering is also more uniform and stable, thus forming a mobile phase medium with a stable rising water flow, which fully disperses the mortar at the bottom of the barrel and effectively separates it during the rising flow process. The arc-shaped water filter can also maximize the contact area and distribute more water filter holes, which can build a more stable mobile phase.

[0059] The sand inlet section includes a sand inlet pipe and a mixing chamber. The mixing chamber is cylindrical or spherical, and a pair of impellers are arranged in the mixing chamber. One side of the mixing chamber is open and connected to the side wall of the barrel, and the other side of the mixing chamber is connected to the sand inlet pipe. The mixing chamber is a cavity structure with a cavity, and its cavity (cavity wall) is fixedly connected or integrated with the side wall of the barrel near the barrel, and the opening on this side of the mixing chamber is connected to the barrel, so that the mortar transported by the sand inlet pipe enters the barrel. The pair of impellers in the mixing chamber are used to re-mix the mortar from the sand inlet pipe, so that the sand and water are fully mixed and evenly mixed, and enter the barrel at a constant flow rate of a certain threshold. On the one hand, the mortar entering the barrel is evenly and quickly dispersed into the mobile phase of the barrel. On the other hand, through the action of the impeller, the pipeline pressure in the sand inlet pipe can be fully offset, reducing the damage of the mortar in the sand inlet section to the balanced mobile phase state established in the barrel.

[0060] Since the sand inlet is lower than the upper edge of the barrel, when the barrel is full of water, the water in the barrel may flow back into the sand inlet, affecting the use. Therefore, based on the above solution, the sand inlet pipe can be extended upward so that the height of the sand inlet pipe is higher than the upper edge of the barrel, which can prevent the above problem.

[0061] The water supply part includes a water supply pipe and a water supply cavity. The water supply cavity is located at the bottom of the barrel body, and the water supply pipe is connected to the water supply cavity.

[0062] The overflow groove is located on the outside of the top of the barrel body, and the overflow groove surrounds the barrel body to form an annular groove structure. The overflow groove is provided with an overflow pipe leading outward;

[0063] The discharge pipe is located at the center of the bottom of the barrel, and runs through the water filter net and the water supply chamber, and extends downward. The discharge pipe is located in the middle of the bottom of the barrel, that is, the upper edge of the discharge pipe is located at the lowest point of the hemispherical water filter net; the water supply unit supplies continuous clean water to the barrel, and the water enters the barrel from the water filter holes on the water filter net, thus forming an upward water flow; driven by the water flow, the mortar at the bottom of the barrel is separated by hydraulic sinking and floating, and the light ones go up and the heavy ones go down. Moreover, the arc-shaped water filter net has a smooth transition, and the sand will not quickly gather to the bottom in large quantities, but will slowly gather to the upper edge of the discharge pipe while washing along the water filter net, and the separation effect is good.

[0064] Embodiment 2:

[0065] like Figure 2 , 3As shown, based on the above embodiment, the sand inlet parts described in this embodiment are provided with 2 to 4, and all the sand inlet parts are installed at the same height of the outer wall of the barrel, and each sand inlet part is centrally symmetrically distributed in a star shape. Conventional silica sand sorting equipment mostly uses a centrally placed sand inlet pipe, that is, a pipe is extended into the middle of the barrel body to discharge the mortar directly into the barrel body. This sand inlet method seriously damages the established equilibrium (dynamic equilibrium) mobile phase dispersion system in the barrel body. Sand and water, and sands of different particle sizes are always in a diffusion process (due to continuous feeding of the sand inlet pipe), that is, a process of density uniformization, or dispersed and separated during the diffusion process. The interference between sand particles in the sorting process is serious, and the separation accuracy is not high. In this embodiment, the sand inlet pipe is branched into multiple branches, and the mortar is transported from the middle of the side wall of the barrel body. The speed at which the mortar enters the barrel body is reduced, the dispersion is uniform, and the interference is reduced, which is conducive to sorting.

[0066] The sand inlet is arranged at half the height between the top of the barrel and the upper edge of the water filter. The water filter is arc-shaped, and its upper edge further extends upward, so that the water flow at the edge of the barrel can also flow, thereby promoting the rapid diffusion of the mortar entering from the sand inlet.

[0067] The impeller is provided with an impeller shaft, an impeller body, and impeller blades. The impeller shaft is horizontally arranged, and its two ends are fixedly assembled in the mixing chamber. The impeller body is sleeved outside the impeller shaft. There are multiple impeller blades, all fixedly mounted on the impeller body. The impeller shaft is arranged horizontally, and the two impeller shafts are arranged longitudinally, and the impeller blades are interlaced with each other. The sand inlet pipe is perpendicular to the plane where the two impeller shafts of the impeller are located. From the perspective of design and manufacturing, the sand inlet pipe is installed perpendicular to the plane where the two impeller shafts are located, which is conducive to cost saving. However, from the perspective of the actual effectiveness of the sorting equipment, it is better that there is a certain angle between the sand inlet pipe and the plane where the two impeller shafts are located, so as to avoid the mortar in the sand inlet pipe directly rushing into the barrel body. In addition, a pair of impellers are rotated in a dynamic form, that is, the impellers are rotated by the impact of the mortar, and the two impellers are very close, so that the impeller blades are staggered and overlapped, and mutually restricted, to avoid unilateral rotation and excessive flow rate.

[0068] like Figure 4 As shown, the sand inlet pipe is arranged obliquely, and one end of the sand inlet pipe away from the barrel body is inclined upward.

[0069] The barrel body is provided with a flow regulating plate, which is inclined downward toward the center of the barrel body, and is provided with a pillar, which fixes the flow regulating plate to the inner wall of the barrel body; a gap is left between the flow regulating plate and the inner wall of the barrel body; there are multiple flow regulating plates, and the multiple flow regulating plates are staggered along the circumferential and / or axial direction of the inner wall of the barrel body.

[0070] The flow regulating plate is arranged in the middle of the barrel body. The flow regulating plate is arranged on the inner side of the barrel body side wall and is tilted downward, so that the mortar entering through the barrel body side wall tends to flow downward and meets the water flow rising from the bottom of the barrel body to be fully diffused and mixed, which is conducive to grading and sorting.

[0071] Embodiment 3:

[0072] like Figure 5 As shown, based on the above embodiment, the water supply pipes described in this embodiment are provided with at least 2, and all the water supply pipes are centrally symmetrically distributed in a star shape and all point to the discharge pipe at the center of the bottom of the barrel body. The water flows entering each water supply pipe impact each other, offsetting the water flow pressure, reducing the water vortex, and making the water flow supplied to the barrel body by the water supply part stable, which is beneficial to the separation of mortar.

[0073] The water supply chamber extends upward along the water filter, and the upper edge of the water supply chamber is higher than the upper edge of the water filter. The above design is to extend the water supply chamber to both sides so that the water supply chamber completely covers the water filter, that is, all positions of the water filter have sufficient water sources, and the water flow speed and pressure at each location are kept as consistent as possible, so that the water flow entering the barrel through the water filter is stable and turbulent, and the sand at each location of the water filter can be washed and sorted, and the hydraulic classification effect is further improved.

[0074] The water supply pipe is arranged horizontally.

[0075] like Figure 6 As shown, the discharge pipe extends upward, and the upper edge of the discharge pipe is higher than the lower edge of the water filter net and lower than the upper edge of the water filter net. The upper edge of the discharge pipe protrudes from the bottom of the water filter net, which can, to a certain extent, prevent the sand that has not been fully screened from being discharged directly through the discharge pipe; the sand around the protruding discharge pipe needs to be fully sunk and screened before it has a chance to be discharged through the discharge port, which can, to a certain extent, reduce the mortar discharged from the discharge pipe from being mixed with a large amount of sand with a small particle size, thereby improving the classification accuracy.

Claims

1. An efficient equipment for sorting petroleum fracturing sand, hereinafter referred to as sorting equipment, characterized by: The sorting equipment includes a barrel, a sand feeding part, a water supply part, an overflow tank, and a discharge pipe; The barrel body is in the shape of a barrel, with an opening at the top and a water filter net at the bottom. The water filter net is in the shape of a circular hemispherical surface and has a plurality of water filter holes. The sand inlet part includes a sand inlet pipe and a mixing chamber. The mixing chamber is cylindrical or spherical and is provided with a pair of impellers. One side of the mixing chamber is open and connected to the side wall of the barrel, and the other side of the mixing chamber is connected to the sand inlet pipe. The water supply part includes a water supply pipe and a water supply cavity. The water supply cavity is located at the bottom of the barrel body, and the water supply pipe is connected to the water supply cavity. The overflow groove is located on the outside of the top of the barrel body, and the overflow groove surrounds the barrel body to form an annular groove structure. The overflow groove is provided with an overflow pipe leading outward; The discharge pipe is arranged at the center of the bottom of the barrel, passes through the water filter and the water supply cavity, and extends downward; There are 2 to 4 sand feeding parts, and all of them are installed at the same height of the outer wall of the barrel, and each sand feeding part is distributed in a centrally symmetrical star shape; The impeller is provided with an impeller shaft, an impeller body, and impeller blades. The impeller shaft is horizontally placed, and both ends thereof are fixedly assembled in the mixing chamber. The impeller body is sleeved outside the impeller shaft. There are a plurality of impeller blades, all of which are fixedly mounted on the impeller body. There are at least two water supply pipes, and all of them are distributed in a star shape and point to the ore discharge pipe at the center of the bottom of the barrel.

2. The device for efficiently sorting petroleum fracturing sand according to claim 1, characterized in that: The sand inlet portion is arranged at half the height between the top of the barrel body and the upper edge of the water filter net.

3. The device for efficiently sorting petroleum fracturing sand according to claim 1, characterized in that: The impeller shafts are arranged horizontally, and the two impeller shafts are arranged longitudinally, and the impeller blades are interlaced with each other.

4. The device for efficiently sorting petroleum fracturing sand according to claim 3, characterized in that: The sand inlet pipe is perpendicular to the plane where the two impeller shafts of the impeller are located.

5. The device for efficiently sorting petroleum fracturing sand according to claim 4, characterized in that: The sand inlet pipe is arranged obliquely, and one end of the sand inlet pipe away from the barrel body is inclined upward.

6. The device for efficiently sorting petroleum fracturing sand according to any one of claims 1 to 5, characterized in that: The barrel body is provided with a flow regulating plate, which is oriented toward the center of the barrel body and tilted downward, and the flow regulating plate is provided with a support, which fixes the flow regulating plate to the inner wall of the barrel body; There is a gap between the flow regulating plate and the inner wall of the barrel; There are multiple flow regulating plates, and the multiple flow regulating plates are staggered along the circumferential direction and / or axial direction of the inner wall of the barrel body.

7. The device for efficiently sorting petroleum fracturing sand according to claim 6, characterized in that: The water supply chamber extends upward along the water filter net, and the upper edge of the water supply chamber is higher than the upper edge of the water filter net; The water supply pipe is arranged horizontally.

8. The device for efficiently sorting petroleum fracturing sand according to claim 7, characterized in that: The ore discharge pipe extends upward, and the upper edge of the ore discharge pipe is higher than the lower edge of the water filter net and lower than the upper edge of the water filter net.

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