CN212189557U - Equipment for efficiently sorting petroleum fracturing sand - Google Patents

Abstract

The utility model relates to a solid splitter and method technical field of wet process, concretely relates to equipment of high-efficient oil fracturing sand of selecting separately. In the prior sorting equipment, a mortar feeding pipe and a water feeding pipe are not matched, so that the fed mortar continuously destroys the dispersion system balance established and maintained in the barrel, and the grading effect is influenced. The utility model comprises a barrel body, a sand inlet part, a water supply part, an overflow trough and an ore discharge pipe; the barrel body is provided with a hemispherical water filtering net; the sand inlet part comprises a sand inlet pipe and a mixing cavity, and a pair of impellers is arranged in the mixing cavity. Through setting up mixing chamber, impeller, carry out the pretreatment to the mortar, be favorable to the mortar to get into the staving more dispersedly, avoid the mortar to the serious destruction of staving dynamic balance disperse system to improve the classification efficiency of mortar.

Description

Equipment for efficiently sorting petroleum fracturing sand

Technical Field

The utility model relates to a solid splitter and method technical field of wet process, concretely relates to equipment of high-efficient oil fracturing sand of selecting separately.

Background

Currently, there are two main domestic silica sand classification methods: one is classification by using a sieve (flat shaking sieve, high square sieve, drum sieve, vibrating sieve, etc.), and the other is classification by using hydraulic power (including desliming). When the silica sand with the granularity of 0.1-1 mm (particularly thinner) is screened and sorted, the screen is easy to block, the grading efficiency is not high, and the screen is seriously abraded. In China, a lot of silica sand sorting plants adopt hydraulic classification, and a desliming bucket or a conical (or cylindrical) hydraulic classifier with ascending water flow improved by the desliming bucket is mainly used for desliming or classification. The hydraulic classification equipment has no moving parts, can not be abraded, and can meet the requirements of various industrial departments (especially glass industry) on the granularity of silica sand to a certain extent; however, for the departments with strict requirements on the granularity (such as precision casting), the quality is sometimes difficult to ensure, and the spiral classifier and the hydrocyclone are only adopted by individual silica sand concentrating mills. The granularity of the spiral grading overflow is not easy to control, and rotating parts are easy to wear; hydrocyclones are sensitive to operating conditions such as water pressure and feed.

Most of the foundry sand production enterprises in China adopt a series of conical hydraulic classifiers (including a cylindrical hydraulic classifier with a smaller lower cone and a cylinder with a certain height at the upper part) to carry out continuous desliming-grading operation on natural silica sand through a washing tower. Although the classifier has simple structure, low manufacturing cost and convenient operation, when the classifier is used for classifying coarse particles (0.3-1 mm), due to the limitation of the structure, the classification effect is poor, the coarse and fine mixed in classified products is serious, the particle size concentration rate is low, and unqualified products are easy to appear.

In foreign countries, silica sand classification also mainly adopts screening and hydraulic classification. The natural sand desliming generally takes a cyclone as a main part, and when the raw sand contains few impurities, the main operation of mineral separation is classification. In order to improve the grading effect and improve the grading efficiency, many foreign companies pay attention to research and develop high-efficiency grading equipment, such as arc screens, jet classifiers, siphon classifiers and various ascending water flow classifiers. Among them, the ones with better grading effect are automatic interference settlement grader, Rheax type grader, etc. The Rhemax fractionation method is widely used in Australian, Fin, Sweden, Olympic, Germany, Japan, etc., because of its high fractionation accuracy.

In the process of separating sand by a hydraulic classification method, firstly, the sand in a water separation device is divided into 3 types, namely a floating layer, a suspended layer and a sinking layer, which occupy an upper layer, a middle layer and a lower layer in a separation container. In actual production, hydraulic classification is carried out in a hindered settling tank, and due to the characteristics of hydraulic classification, the requirements on classification precision and productivity are met, high dispersion degree among particle sizes is required, and the section size of certain equipment is ensured. From theoretical analysis, under the condition of a certain water flow velocity, the circulating water quantity is in direct proportion to the square of the diameter of the equipment, the larger the treatment capacity of the equipment is, the higher the grading precision is, the larger the section size of the required equipment is, and the larger the circulating water quantity and the power consumption corresponding to the section size are. Therefore, the diameter of the hindered settling tank is designed to be reduced as much as possible, the problem of dispersion among particle sizes and productivity is solved by increasing the height of equipment, and the height of the hindered settling tank is more than 3m generally. Due to the structural characteristics of the hindered settling tank, the equipment investment cost is high and the building capital cost of a factory is high compared with screening and grading under the condition of the same grading treatment capacity.

The hydraulic classification has the advantages that: the hydraulic classification is to separate particles with different particle sizes through the buoyancy of water flow, compared with a screening method, the hydraulic classification has no screen in equipment, the screen does not need to be replaced, the maintenance cost of the equipment is reduced, the labor intensity of workers and the auxiliary time of production are reduced, and meanwhile, the continuity and the stability of production are ensured. The disadvantages are that: the hydraulic classification is to separate particles with different particle sizes according to the characteristics of water flow, so that the density, shape and sedimentation conditions of the particles have influence on the sedimentation velocity, and the cross-sectional size of equipment is limited by factors such as power consumption in design, so that the particle group mixing phenomenon is serious during classification, and the problems of high power consumption, low separation precision, low unit volume processing capacity and the like exist. In addition, the hydraulic classification operation control is strict, and the control process is easy to fluctuate. When all the control factors change in the production process, the classification is easy to fail.

Therefore, as can be seen from the above description, the state of the dispersion formed between the water and the sand in the sorting equipment has a significant influence on the sorting effect, i.e., a uniform and stable dispersion can output sand with a single particle size (a certain mesh range) to a certain extent, and the precision of the sorted product (the proportion of the sand with a specified particle size in the sand with a certain specification) is high. However, in the existing separation equipment, a mortar feeding pipe and a water feeding pipe in a single classifier (referring to a barrel body of single separation equipment) are not matched, so that the fed mortar continuously destroys the dispersion system balance established and maintained in the barrel body, and the classification effect is influenced.

The petroleum fracturing sand belongs to a fracturing propping agent, has high fracturing strength, and is mainly used for underground support of an oil field so as to increase the yield of petroleum and natural gas. The fracturing propping agent is prepared by sintering various raw materials such as high-quality bauxite and the like by using ceramics, is a substitute of medium and low strength propping agents such as natural quartz sand, glass balls, metal balls and the like, and has good effect on increasing the yield of petroleum and natural gas. When the petroleum and natural gas deep well is exploited, the high-closure-pressure low-permeability deposit is fractured to crack the oil-gas-containing rock stratum, and the oil gas is collected from a channel formed by the fracture. The ceramsite supporting material enters the stratum along with the high-pressure solution and is filled in the cracks of the rock stratum, and the effect of supporting the cracks not to be closed due to stress release is achieved, so that the high flow conductivity is kept, oil and gas are smooth, and the yield is increased. Practice proves that the oil well fractured by the ceramsite proppant can improve the yield by 30-50% and can prolong the service life of the oil and gas well.

The fracturing propping agent can be widely used for the fracturing reformation of deep wells and high-pressure oil-gas layers. Classification of fracturing proppant products:

1. according to the crushing resistance degree, respectively: four series of 52MPa (7500 psi), 69MPa (10000 psi) and 86MPa (12500 psi), 102MPa (15000 psi);

2. the volume density is divided into: low, medium, high density;

3. according to the specification, the method comprises the following steps: 12-20 meshes, 16-30 meshes, 20-40 meshes, 30-50 meshes, 40-60 meshes, 40-70 meshes, 70-100 meshes and the like. In order to meet the requirements of oil and gas wells at home and abroad, users can select products with different strengths and specifications according to the depth of the oil well. Of course, the product classification is based on standard fracturing propping agents, and indexes such as classification specification and crushing strength are different when natural silica sand is used as the fracturing propping agent.

Disclosure of Invention

The purpose of the utility model is mainly that: the equipment for efficiently sorting the petroleum fracturing sand is provided, namely, the device for hydraulic classification of the natural silica sand by adopting the set of device.

The above purpose is realized by the following technical scheme:

the utility model provides an equipment of high-efficient separation oil fracturing sand, the following sorting facilities that simply is called, its characterized in that:

the sorting equipment comprises a barrel body, a sand inlet part, a water supply part, an overflow trough and an ore discharge pipe;

the barrel body is in a cylindrical shape, the upper end of the barrel body is opened, the bottom of the barrel body is provided with a water filtering net, the water filtering net is in a circular hemispherical surface, and the water filtering net is provided with a plurality of water filtering holes;

the sand inlet part comprises a sand inlet pipe and a mixing cavity, the mixing cavity is cylindrical or spherical, and a pair of impellers is arranged in the mixing cavity; one side of the mixing cavity is opened and communicated with the side wall of the barrel body, and the other side of the mixing cavity is communicated with the sand inlet pipe;

the water supply part comprises a water supply pipe and a water supply cavity, the water supply cavity is positioned at the bottom of the barrel body, and the water supply pipe is communicated with the water supply cavity;

the overflow groove is positioned on the outer side of the top of the barrel body, the overflow groove surrounds the barrel body for a circle to form an annular groove-shaped structure, and the overflow groove is provided with an overflow pipe led out outwards;

the ore discharge pipe is arranged in the center of the bottom of the barrel body, penetrates through the water filter screen and the water supply cavity and extends downwards.

The sand feeding portions are 2-4, all the sand feeding portions are arranged at the same height on the outer wall of the barrel body, and the sand feeding portions are distributed in a centrosymmetric star shape.

The sand inlet part is arranged at a half height position between the top end of the bucket body and the upper edge of the water filtering net.

The impeller is provided with an impeller shaft, an impeller body and a plurality of impeller blades, the impeller shaft is transversely arranged, two ends of the impeller shaft are fixedly assembled in the mixing cavity, the impeller body is sleeved outside the impeller shaft, and the impeller blades are all fixedly arranged on the impeller body.

The impeller shafts are horizontally arranged, the two impeller shafts are longitudinally arranged, and the impeller blades are mutually inserted.

The sand inlet pipe is vertical to the plane of the two impeller shafts of the impeller.

The sand inlet pipe is obliquely arranged, and one end of the sand inlet pipe, which is far away from the barrel body, is upwards inclined.

The barrel body is provided with a flow regulating plate which is inclined downwards towards the center of the barrel body and is provided with a support column which fixedly connects the flow regulating plate to the inner wall of the barrel body;

a gap is reserved between the flow regulating plate and the inner wall of the barrel body;

the flow adjusting plates are arranged in a plurality of numbers, and the flow adjusting plates are arranged along the circumferential direction and/or the axial direction of the inner wall of the barrel body in a staggered mode.

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

At least 2 water supply pipes are arranged, and all the water supply pipes are distributed in a star shape and all point to the ore discharge pipe at the center of the bottom of the barrel body.

The water supply cavity extends upwards along the water filter screen, and the upper edge of the water supply cavity is higher than the upper edge of the water filter screen.

The water supply pipe is horizontally arranged.

The ore discharge pipe extends upwards, and the upper edge of the ore discharge pipe is higher than the lower edge of the water filter screen and lower than the upper edge of the water filter screen.

The utility model has the advantages that:

(1) the mortar which is conveyed by the sand inlet pipe and has certain impact force is pretreated to a certain degree by arranging the mixing cavity on the sand inlet pipe and arranging the pair of impellers which reversely and synchronously rotate in the mixing cavity, so that the mortar is mixed and homogenized again, the impact force of the conveying pipeline on the mortar is further offset, and the mortar entering the barrel body is gentle and uniformly dispersed;

(2) the sand inlet parts with the mixing cavities are arranged in a plurality of centrosymmetric star-shaped distributions, so that the mortar can enter the barrel body more dispersedly, and the serious damage of the mortar conveyed by the sand inlet pipe arranged in the middle of the conventional device to the dynamic balance dispersion system of the barrel body is avoided;

(3) the sorting equipment is provided with the water supply part, the water supply cavity of the water supply part extends upwards along the circular hemispherical water filter screen, so that clean water conveyed by a water supply pipe can uniformly pass through the water filter screen, the influence of water flow of the water supply pipe on water flow in the barrel body is reduced, nearly stable and uniform upward water flow is formed in the barrel body, and the influence of non-directional turbulence and the like is minimized;

(4) the separation equipment constructs a liquid medium with stable flow, is beneficial to grading silica sand and improves the grading precision; in addition, the mortar entering the barrel body is quickly dispersed into the liquid medium through the sand inlet part, so that the grading efficiency of the mortar is improved.

Drawings

The utility model discloses used attached drawing as follows:

fig. 1 is a schematic structural diagram of a sorting device in embodiment 1 of the present invention, in which each arrow indicates a material conveying direction, such as sand feeding, water feeding, ore discharging, overflowing, etc.;

fig. 2 is a schematic top view of the sorting apparatus in embodiment 2 of the present invention, in which a star-shaped distribution structure of a plurality of sand inlets is mainly shown;

fig. 3 is a schematic structural view of a sand inlet part in embodiment 2 of the present invention;

fig. 4 is a schematic structural view of the inclined arrangement of the sand inlet pipe of the sand inlet part in embodiment 2 of the present invention;

fig. 5 is a schematic structural view in embodiment 3 of the present invention;

fig. 6 is a schematic structural view of a protruded ore discharge pipe in embodiment 3 of the present invention.

As can be seen from the figure:

1 barrel 11 water filter 12 water filter hole 13 flow adjusting plate 14 pillar

2 sand inlet part 21 sand inlet pipe 22 mixing cavity 23 impeller 24 impeller shaft 25 impeller body 26 impeller blade

3 water supply part 31 water supply pipe 32 water supply cavity

4 overflow trough

5, discharging the ore pipes.

Detailed Description

Example 1:

as shown in figure 1, the equipment for efficiently sorting the oil fracturing sand is simply called as sorting equipment and is characterized in that:

the sorting equipment comprises a barrel body, a sand inlet part, a water supply part, an overflow trough and an ore discharge pipe;

the barrel body is in a cylindrical shape, the upper end of the barrel body is opened, the bottom of the barrel body is provided with a water filtering net, the water filtering net is in a circular hemispherical surface, and the water filtering net is provided with a plurality of water filtering holes; the water filter screen is a plate-shaped component with a plurality of through holes, and is arranged at the bottom of the barrel body and seals the bottom of the barrel body, so that the barrel body is in a structure of an upper barrel and a bottom semi-spherical surface; the upper edge of the semispherical water filtering net is fixedly connected with the side wall of the bottom of the barrel body or is connected into a whole.

The general silica sand hydraulic separation equipment generally adopts a conical bottom, the outline of the conical bottom is linear, the sand with large particle size at the bottom of a barrel body can be conveniently collected to the conical top end (the conical top end is inverted and downwards), and the sand with large particle size can be quickly discharged; however, the conventional conical bottom sorting equipment is not beneficial to fully separating mortar at the bottom of the barrel body, the interference is serious in the screening process, and the separation precision is not good. The bottom of the sorting equipment with the hemispherical barrel bottom is arc-shaped, and the entering water flow is uniform and stable, so that a mobile phase medium with stable ascending water flow is formed, the mortar at the bottom of the barrel body is fully dispersed, and is effectively separated in the ascending flow process. The circular arc-shaped water filtering net can also maximize the contact area, distribute more water filtering holes and construct a more stable mobile phase.

The sand inlet part comprises a sand inlet pipe and a mixing cavity, the mixing cavity is cylindrical or spherical, and a pair of impellers is arranged in the mixing cavity; one side of the mixing cavity is opened and communicated with the side wall of the barrel body, and the other side of the mixing cavity is communicated with the sand inlet pipe; the mixing cavity is a cavity structure with a cavity, one side of the cavity (cavity wall) close to the barrel body is fixedly connected or connected with the side wall of the barrel body into a whole, and an opening on the side of the mixing cavity is communicated with the barrel body, so that mortar conveyed by the sand inlet pipe enters the barrel body. The pair of impellers in the mixing cavity is used for mixing the mortar from the sand inlet pipe again to ensure that the sand and the water are fully and uniformly mixed and enter the barrel body at a constant flow rate with a certain threshold value, so that the mortar entering the barrel body is uniformly and quickly dispersed into a flowing phase of the barrel body, and the pipeline pressure in the sand inlet pipe can be fully offset through the action of the impellers, and the damage of the mortar in the sand inlet part to the well-balanced flowing phase state established by the barrel body is reduced.

Because the position of the sand inlet part is lower than the upper edge of the barrel body, when the barrel body is filled with water, the water in the barrel body can flow back into the sand inlet part, and the use is influenced. Therefore, on the basis of the scheme, the sand inlet pipe can be extended upwards, so that the height of the sand inlet pipe is higher than the upper edge of the barrel body, and the problem can be prevented.

The water supply part comprises a water supply pipe and a water supply cavity, the water supply cavity is positioned at the bottom of the barrel body, and the water supply pipe is communicated with the water supply cavity;

the overflow groove is positioned on the outer side of the top of the barrel body, the overflow groove surrounds the barrel body for a circle to form an annular groove-shaped structure, and the overflow groove is provided with an overflow pipe led out outwards;

the ore discharge pipe is arranged in the center of the bottom of the barrel body, penetrates through the water filter screen and the water supply cavity and extends downwards. The ore discharge pipe is positioned in the middle of the bottom of the barrel body, namely the upper edge of the ore discharge pipe is positioned at the lowest point of the hemispherical water strainer; the water supply part supplies continuous clear water to the barrel body, and the water enters the barrel body from the water filtering holes on the water filtering net so as to form upward water flow; due to the driving of water flow, mortar at the bottom of the barrel body can be separated through hydraulic sinking and floating, the light sand is on the upper part and the heavy sand is on the lower part, the arc-shaped water filtering net is in gentle transition, sand can not be collected to the bottom rapidly in a large amount, the sand is collected to the upper edge of the ore discharge pipe slowly along the edge of the water filtering net while being washed, and the separation effect is good.

Example 2:

as shown in fig. 2 and 3, on the basis of the above embodiments, in the present embodiment, 2 to 4 sand feeding portions are provided, and all the sand feeding portions are installed at the same height position on the outer wall of the barrel body, and each sand feeding portion is distributed in a star shape with a central symmetry. The conventional silica sand separation equipment mostly adopts a middle sand inlet pipe, namely, one pipe extends into the middle of the barrel body, mortar is directly discharged into the barrel body, the sand inlet mode seriously damages an established balanced (dynamic balance) mobile phase dispersion system in the barrel body, sand and water and sand with different particle sizes are always in a diffusion process (continuously fed due to the sand inlet pipe), namely, the process of density uniformity is realized, or the separation is carried out while dispersion is carried out in the diffusion process, the interference among sand grains in the separation process is serious, and the separation precision is not high. The embodiment will advance the sand pipe branch and be a plurality ofly to carry the mortar from staving lateral wall middle part, the speed that the mortar got into the staving reduces, the dispersion is even, reduces to interfere, does benefit to the separation.

The sand inlet part is arranged at a half height position between the top end of the bucket body and the upper edge of the water filtering net. The water filtering net is arc-shaped, the upper edge of the water filtering net further extends upwards, so that water flow at the edge position of the barrel body can flow, and mortar entering from the sand inlet part is promoted to be rapidly diffused.

The impeller is provided with an impeller shaft, an impeller body and a plurality of impeller blades, the impeller shaft is transversely arranged, two ends of the impeller shaft are fixedly assembled in the mixing cavity, the impeller body is sleeved outside the impeller shaft, and the impeller blades are all fixedly arranged on the impeller body. The impeller shafts are horizontally arranged, the two impeller shafts are longitudinally arranged, and the impeller blades are mutually inserted. The sand inlet pipe is vertical to the plane of the two impeller shafts of the impeller. From the design and manufacture point of view, the sand inlet pipe is vertically arranged with the plane where the two impeller shafts are located, which is beneficial to saving the cost, but from the practical efficacy point of view of the sorting equipment, a certain angle is preferably formed between the sand inlet pipe and the plane where the two impeller shafts are located, so that the mortar in the sand inlet pipe is prevented from directly rushing into the barrel body. In addition, a pair of impellers rotate in a power mode, namely the impellers rotate only by the impact of mortar, and the two impellers are close to each other, so that impeller blades are mutually overlapped in a staggered mode and mutually restricted, and unilateral rotation and over-high flow speed are avoided.

As shown in FIG. 4, the sand inlet pipe is obliquely arranged, and one end of the sand inlet pipe, which is far away from the barrel body, is inclined upwards.

The barrel body is provided with a flow regulating plate which is inclined downwards towards the center of the barrel body and is provided with a support column which fixedly connects the flow regulating plate to the inner wall of the barrel body; a gap is reserved between the flow regulating plate and the inner wall of the barrel body; the flow adjusting plates are arranged in a plurality of numbers, and the flow adjusting plates are arranged along the circumferential direction and/or the axial direction of the inner wall of the barrel body in a staggered mode.

The flow regulating plate is arranged at the middle section of the barrel body. The flow regulating plates are arranged on the inner side of the side wall of the barrel body and are all inclined downwards, so that mortar entering through the side wall of the barrel body tends to flow downwards and is fully diffused and uniformly mixed with water flow rising at the bottom of the barrel body, and grading separation is facilitated.

Example 3:

as shown in fig. 5, on the basis of the above embodiment, in this embodiment, at least 2 water supply pipes are provided, all of the water supply pipes are distributed in a central symmetrical star shape and all point to the ore discharge pipe at the center of the bottom of the barrel body, and water flows entering the water supply pipes impact each other to offset water flow pressure and reduce rotational flow of water, so that the water flow supplied to the barrel body by the water supply part is stable, and mortar separation is facilitated.

The water supply cavity extends upwards along the water filter screen, and the upper edge of the water supply cavity is higher than the upper edge of the water filter screen. The above-mentioned design is to the water cavity to both sides extension for the water cavity covers the water strainer entirely, and all positions of water strainer all have sufficient water source promptly, and everywhere velocity of water, pressure etc. keep unanimous as far as possible, thereby make through the water flow steady, the no torrent of water strainer entering staving, can also all wash, select separately the sand everywhere to the water strainer, hydraulic classification effect can further improve.

The water supply pipe is horizontally arranged.

As shown in fig. 6, the ore discharging pipe extends upwards, and the upper edge of the ore discharging pipe is higher than the lower edge of the water filter screen and lower than the upper edge of the water filter screen. The upper edge of the ore discharge pipe protrudes out of the bottom of the water filter screen, so that sand which is not fully screened can be prevented from being directly discharged through the ore discharge pipe to a certain extent; the sand around the protruded ore discharge pipe needs to be fully floated and screened and then is discharged through the ore discharge port, so that mortar discharged from the ore discharge pipe can be reduced to a certain extent to mix with a large amount of sand with smaller particle size, and the grading precision is improved.

Claims (10)

1. The utility model provides an equipment of high-efficient separation oil fracturing sand, the following sorting facilities that simply is called, its characterized in that:

the sorting equipment comprises a barrel body, a sand inlet part, a water supply part, an overflow trough and an ore discharge pipe;

the barrel body is in a cylindrical shape, the upper end of the barrel body is opened, the bottom of the barrel body is provided with a water filtering net, the water filtering net is in a circular hemispherical surface, and the water filtering net is provided with a plurality of water filtering holes;

the sand inlet part comprises a sand inlet pipe and a mixing cavity, the mixing cavity is cylindrical or spherical, and a pair of impellers is arranged in the mixing cavity; one side of the mixing cavity is opened and communicated with the side wall of the barrel body, and the other side of the mixing cavity is communicated with the sand inlet pipe;

the water supply part comprises a water supply pipe and a water supply cavity, the water supply cavity is positioned at the bottom of the barrel body, and the water supply pipe is communicated with the water supply cavity;

the overflow groove is positioned on the outer side of the top of the barrel body, the overflow groove surrounds the barrel body for a circle to form an annular groove-shaped structure, and the overflow groove is provided with an overflow pipe led out outwards;

the ore discharge pipe is arranged in the center of the bottom of the barrel body, penetrates through the water filter screen and the water supply cavity and extends downwards.

2. The equipment for efficiently sorting the oil fracturing sand according to claim 1, wherein:

the sand feeding portions are 2-4, all the sand feeding portions are arranged at the same height on the outer wall of the barrel body, and the sand feeding portions are distributed in a centrosymmetric star shape.

3. The apparatus for efficiently sorting oil frac sand according to claim 2, wherein:

the sand inlet part is arranged at a half height position between the top end of the bucket body and the upper edge of the water filtering net.

4. The equipment for efficiently sorting the oil fracturing sand according to claim 1, wherein:

the impeller is provided with an impeller shaft, an impeller body and a plurality of impeller blades, the impeller shaft is transversely arranged, two ends of the impeller shaft are fixedly assembled in the mixing cavity, the impeller body is sleeved outside the impeller shaft, and the impeller blades are all fixedly arranged on the impeller body.

5. The apparatus for efficiently sorting oil frac sand according to claim 4, wherein:

the impeller shafts are horizontally arranged, the two impeller shafts are longitudinally arranged, and the impeller blades are mutually inserted.

6. The apparatus for efficiently sorting oil frac sand according to claim 5, wherein:

the sand inlet pipe is vertical to the plane of the two impeller shafts of the impeller.

7. The apparatus for efficiently sorting oil frac sand according to claim 6, wherein:

the sand inlet pipe is obliquely arranged, and one end of the sand inlet pipe, which is far away from the barrel body, is upwards inclined.

8. The apparatus for efficiently sorting oil frac sand according to any one of claims 1 to 7, wherein:

the barrel body is provided with a flow regulating plate which is inclined downwards towards the center of the barrel body and is provided with a support column which fixedly connects the flow regulating plate to the inner wall of the barrel body;

a gap is reserved between the flow regulating plate and the inner wall of the barrel body;

the flow adjusting plates are arranged in a plurality of numbers, and the flow adjusting plates are arranged along the circumferential direction and/or the axial direction of the inner wall of the barrel body in a staggered mode.

9. The apparatus for efficiently sorting oil frac sand according to claim 8, wherein:

at least 2 water supply pipes are arranged, and all the water supply pipes are distributed in a star shape and point to the ore discharge pipe in the center of the bottom of the barrel body;

the water supply cavity extends upwards along the water filter screen, and the upper edge of the water supply cavity is higher than the upper edge of the water filter screen;

the water supply pipe is horizontally arranged.

10. The apparatus for efficiently sorting oil frac sand according to claim 9, wherein:

the ore discharge pipe extends upwards, and the upper edge of the ore discharge pipe is higher than the lower edge of the water filter screen and lower than the upper edge of the water filter screen.

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