A polymer dry powder conveying device for fracturing

Abstract

The present invention discloses a polymer dry powder conveying device for fracturing, which belongs to the field of material conveying technology. The device includes a hopper, a screw conveyor and a granular material crushing structure, wherein the screw conveyor is used to feed the dry powder in the hopper into the granular material crushing structure, and the granular material crushing structure crushes the lumps by mutual collision between spherical particles. The present invention pushes the polymer dry powder for fracturing to move by the screw conveyor, and can measure and transport the dry powder. At the same time, the present invention utilizes the relative movement and mutual collision of spherical particles to crush the lumps. The crushing conditions are mild and will not cause obvious temperature rise, which is beneficial to protecting the polymer dry powder for fracturing. In addition, the movement and collision of spherical particles are random, and the lumps will continue to withstand their collision and friction during the mixing process with the spherical particles, which is beneficial to fully crushing the lumps, achieving a better crushing effect, and realizing the function of crushing the lumps and outputting powdered dry powder.

Description

Technical Field

[0001] The present invention belongs to the technical field of material conveying, and in particular relates to the transmission and crushing of easily agglomerated powder materials, and specifically relates to a polymer dry powder conveying device for fracturing. Background Art

[0002] Fracturing fluid is the liquid used in reservoir fracturing construction. To prepare the fracturing fluid, raw materials such as polymer dry powder need to be added to water for mixing. Similar to conventional solid material conveying, screw conveyors are currently commonly used to convey dry powder. Screw conveyors use the rotation of spiral blades to propel the material through the housing. Adjusting the speed of the spiral blades adjusts the powder delivery rate, thus fulfilling both conveying and metering functions. However, the spiral blades squeeze the dry powder as they propel it through the housing. Polymer dry powder is a relatively unique raw material, typically with a large specific surface area, and easily forms lumps when squeezed. These lumps are relatively loose, but once added to water, they easily absorb water, swell, and form dense lumps that are difficult to dissolve. Therefore, it is necessary to process the dry powder during its delivery process so that it leaves the conveying device in powdered form. Some existing solid conveying devices use a screw conveyor plus a rotating blade configuration to crush the material. However, the blade uses strong shear / impact force to crush the material, which will cause the raw material temperature to rise. For polymer dry powder used for fracturing, the polymer will have problems such as thermal degradation and thermal reaction under elevated temperature conditions. Therefore, it is not suitable. If the rotation speed of the blade is reduced, the crushing efficiency will be low, which will also seriously affect the conveying efficiency. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a polymer dry powder conveying device for fracturing, which pushes the fracturing dry powder to move in the shell through a screw conveyor, and a particle material crushing structure is set at the outlet of the screw conveyor. This structure crushes the agglomerates through the collision of the particles. The crushing conditions are mild and very suitable for crushing the agglomerates of polymer dry powder for fracturing.

[0004] In order to achieve the above object, the solution provided by the present invention is as follows:

[0005] A polymer dry powder conveying device for fracturing, comprising:

[0006] A vertically arranged hopper for storing dry polymer powder for fracturing;

[0007] a screw conveyor connected to the hopper outlet, for receiving and conveying dry polymer powder for fracturing;

[0008] Granular material crushing structure, including:

[0009] a cylinder arranged vertically and connected to the outlet of the screw conveyor;

[0010] A partition plate is arranged horizontally in the cylinder, and two one-way valve groups are set on the partition plate. The two one-way valve groups guide the material to flow in two opposite directions in the cylinder;

[0011] a sieve plate arranged in the cylinder and located below the partition plate;

[0012] A plurality of spherical particles are located in the cylinder and on the sieve plate, the size of the spherical particles is larger than the sieve holes on the sieve plate, and the spherical particles can pass through the partition plate along the directions respectively defined by the two one-way valve groups;

[0013] A power mechanism for pushing one of the partition plate and the screen plate to move back and forth along the axial direction of the cylinder, wherein when the partition plate and the screen plate move toward each other, the spherical particles are pushed to move upward and pass through the partition plate; when the partition plate and the screen plate move in opposite directions, the spherical particles move downward under the action of their own gravity and pass through the partition plate.

[0014] In one embodiment of the present invention, the separator plate comprises an inner ring and an outer ring, with two check valve assemblies positioned on the inner and outer rings, respectively, allowing spherical particles to pass through the inner and outer rings in opposite directions. This helps reduce dead zones in the packed bed formed by the stacked spherical particles and increases collisions between the spherical particles.

[0015] Furthermore, the one-way valve group on the inner ring is used to guide the spherical particles to flow in one direction toward the sieve plate. This helps to form a concave pit on the top of the packing bed, which is convenient for gathering agglomerates and allowing the agglomerates to withstand the impact of spherical particles from all directions, thereby improving the crushing efficiency.

[0016] Furthermore, spherical particles are stacked within the cylinder to form a packed bed. Each one-way valve assembly includes several one-way valves. At least some of the one-way valves in the outer ring of the one-way valve assembly have outlets connected to the cylindrical conduit, and at least some of the cylindrical conduits are higher than the height of the packed bed. This allows more spherical particles to impact the agglomerates at the top of the packed bed.

[0017] Furthermore, at least part of the outlet of the cylindrical conduit is located in the packed bed.

[0018] As a specific embodiment of the present invention, the power mechanism includes:

[0019] A pull rod arranged along the axial direction of the cylinder and capable of moving only along the axial direction of the cylinder;

[0020] a collar fixed to one end of the tie rod;

[0021] A rotating shaft coaxially and fixedly connected to the screw of the screw conveyor;

[0022] A slider having one end fixedly connected to the rotating shaft and the other end extending radially along the rotating shaft;

[0023] The screw drives the slider to rotate in the collar, and during the rotation, under the action of the gravity of the collar, the inner wall of the collar abuts against the slider or the rotating shaft.

[0024] Furthermore, a slip ring is provided on the outer wall of the cylinder, the other end of the pull rod passes through the casing of the screw conveyor and is movably connected to it, and one end of the pull rod passes through the casing and is fixedly connected to the slip ring, thereby driving the slip ring to move axially along the cylinder; the slip ring and the screen plate are magnetically attracted, so that the two move synchronously.

[0025] Beneficial effects: The present invention uses a screw conveyor to push the fracturing dry powder to move, which can measure and transport the dry powder. At the same time, during the transportation process, the relative movement and mutual collision of spherical particles are used to crush the agglomerates. The crushing conditions are mild and will not cause obvious temperature rise, which is beneficial to protecting the polymer dry powder used for fracturing. In addition, the movement and collision of spherical particles are random. The agglomerates will continue to withstand their collision and friction during the mixing process with the spherical particles, which is beneficial to fully crushing the agglomerates and achieving a better crushing effect, ultimately achieving the purpose of the polymer dry powder leaving the conveying device in powder form. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a specific embodiment of the present invention;

[0027] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle partition plate;

[0028] Figure 3 yes Figure 1 Schematic diagram of the structure of the power mechanism;

[0029] Figure 4 yes Figure 3 Schematic diagram of the structure of the middle tie rod;

[0030] Figure 5 is a structural diagram of another specific embodiment of the present invention;

[0031] Figure 6 yes Figure 5 Right view;

[0032] Figure 7 yes Figure 5 Schematic diagram of the structure of the middle partition plate;

[0033] In the figure: hopper 100; screw conveyor 200; granular material crushing structure 300; cylindrical guide tube 400; spring 500; slip ring 600; limit block 700;

[0034] Spiral blade 210; screw 220; housing 230; barrel 310; partition plate 320; one-way valve assembly 330; sieve plate 340; power mechanism 350; spherical particles 360;

[0035] Inner ring 321 ; outer ring 322 ; first one-way valve assembly 331 ; second one-way valve assembly 332 ; pull rod 351 ; collar 352 ; rotating shaft 353 ; slider 354 . DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below with reference to the embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0037] Please refer to Figures 1 to 7 , which shows the structures of several specific embodiments of the polymer dry powder conveying device for fracturing according to the present invention. The polymer dry powder conveying device for fracturing according to the present invention comprises a hopper 100, a screw conveyor 200, and a granular material crushing structure 300. The hopper 100 is arranged vertically and is used to store polymer dry powder for fracturing, such as polyacrylamide. The inlet of the screw conveyor 200 is connected to the outlet of the hopper 100, and the outlet is connected to the granular material crushing structure 300. ... of the screw conveyor 200 is used to measure the dry powder and convey it to the granular material crushing structure 300. During the conveying process, the dry powder is compressed by the spiral blades 210 to form agglomerates. The granular material crushing structure 300 is used to crush the agglomerates, thereby producing a powdered dry powder.

[0038] The particle material crushing structure 300 of the present invention includes a cylinder 310, a partition plate 320, a one-way valve group 330, a sieve plate 340, a power mechanism 350 and spherical particles 360, wherein the cylinder 310 is tubular, arranged vertically and connected to the outlet of the screw conveyor 200, for receiving dry powder containing lumps; the partition plate 320 is arranged horizontally in the cylinder 310, and two one-way valve groups 330 are provided on the partition plate 320, namely a first one-way valve group 331 and a second one-way valve group 332, the two one-way valve groups 330 respectively guide the material to flow in two opposite directions in the cylinder 310, for example, the first one-way valve group 331 guides the material to flow from top to bottom, and the second one-way valve group 332 guides the material to flow from bottom to top; the sieve plate 340 is arranged in the cylinder 310 and is located below the partition plate 320; there are several spherical particles 360, all of which are located in the cylinder 310 and on the sieve plate In the upper space of 340, these spherical particles 360 are stacked to form a packing bed. The size of the spherical particles 360 is larger than the sieve holes on the sieve plate 340 to ensure that they will not leak from the sieve plate 340. The spherical particles 360 can pass through the partition plate 320 along the directions specified by the two one-way valve groups 330. The power mechanism 350 is used to push one of the partition plate 320 and the sieve plate 340 to move back and forth along the axial direction of the cylinder 310. When the partition plate 320 and the sieve plate 340 are close, the spherical particles 360 are pushed to move upward and pass through the partition plate 320; when the partition plate 320 and the sieve plate 340 are away from each other, the spherical particles 360 move downward under the action of their own gravity and pass through the partition plate 320, so that the spherical particles 360 will pass through the partition plate 320 reciprocatingly. During the whole process, these spherical particles 360 will move and collide with each other, which can crush the agglomerates in the cylinder 310.

[0039] The present invention utilizes the relative movement and mutual collision of spherical particles to crush agglomerates. The crushing conditions are mild and will not cause obvious temperature rise, which is beneficial to protecting the polymer dry powder used for fracturing. At the same time, the movement and collision of the spherical particles are random. The agglomerates will continue to withstand their collision and friction during the mixing process with the spherical particles, which is beneficial to fully crushing the agglomerates and achieving a better crushing effect.

[0040] In the present invention, each one-way valve assembly 330 comprises several parallel one-way valves, which restrict the flow of material to a single direction. The purpose of providing two one-way valve assemblies is to prevent the material from moving up and down along the same path during reciprocating motion, thereby encouraging the particles to move horizontally, allowing for sufficient interaction and collision between the particles and reducing the volume of the dead zone (area of ​​no flow). The specific type of one-way valve can be selected as needed. The spherical particles 360 can be made of wear-resistant materials such as steel.

[0041] In the present invention, the spherical particles 360 reciprocate through the partition plate 320, thereby causing the spherical particles 360 to move and collide with each other. In some embodiments, such as Figure 2As shown, the partition plate 320 includes an inner ring 321 and an outer ring 322. The outer ring 322 is coaxially fixed to the outer wall of the inner ring 321. The first one-way valve group 331 and the second one-way valve group 332 are correspondingly arranged on the inner ring 321 and the outer ring 322, so that the spherical particles 360 pass through the inner ring 321 and the outer ring 322 in opposite directions. This can promote the circulation of the spherical particles 360 inside and outside the entire packing bed, enhance the friction and collision between the particles, and further reduce the dead zone.

[0042] In the present invention, when the spherical particles 360 reciprocate through the partition plate 320, the upper end surface of the packing bed will continuously change. In some embodiments, the one-way valve group 330 on the inner ring 321 guides the spherical particles 360 to flow in one direction toward the sieve plate 340, such as Figure 1 and Figure 5 As shown, when the spherical particles 360 move downward through the one-way valve group 330 on the inner ring 321, the upper end surface of the packing bed is a slope with a high outer edge and a low center, forming a concave pit shape, which is conducive to the gathering of agglomerates at the center; when the spherical particles 360 move upward through the one-way valve group 330 on the outer ring 322, the particles at the edge of the upper end surface of the packing bed will slide toward the center, and the agglomerates located at the center of the upper end surface will be impacted by the spherical particles 360 coming from all directions, making them more easily broken. In order to increase the number of spherical particles 360 that slide toward the center at the upper end surface of the packing bed, in some embodiments, in the one-way valve group 330 on the outer ring 322, the outlets of some one-way valves (the one-way valve group 330 is composed of several one-way valves connected in parallel) are provided with cylindrical conduits 400, and the height of some cylindrical conduits 400 is higher than the height of the packing bed, as shown in FIG. Figure 5 As shown, the spherical particles 360 passing through this portion of the cylindrical conduit 400 will slide directly toward the center of the upper end face when leaving the cylindrical conduit 400. Of course, in some embodiments, such as Figure 7 As shown, the outlets of some cylindrical conduits 400 are located between the spherical particles 360 of the partition plate 320, thereby enhancing the collision effect of the spherical particles 360 inside the entire packing bed.

[0043] The power mechanism 350 of the present invention can adopt an existing reciprocating structure. In order to reduce the number of power devices, in some embodiments, the screw 220 of the screw conveyor 200 can be used to provide power. In some embodiments, as Figure 1 and Figure 5As shown, the power mechanism 350 includes a pull rod 351, a collar 352, a rotating shaft 353 and a slider 354, wherein the pull rod 351 is arranged axially along the cylinder 310 and can only move axially along the cylinder 310, and the collar 352 is fixed to one end of the pull rod 351; the rotating shaft 353 is coaxially fixedly connected to the screw 220 of the screw conveyor 200, so that the screw conveyor 200 is used to drive the rotating shaft 353 to rotate; one end of the slider 354 is fixedly connected to the rotating shaft 353, and the other end extends radially along the rotating shaft 353, and the rotating shaft 353 drives the slider 35 During the rotation process, the slider 354 rotates inside the collar 352, and the collar 352 moves downward under the action of its own gravity. When the free end of the slider 354 abuts the inner wall of the collar 352, it pushes the collar 352 to move axially, thereby driving the pull rod 351 to reciprocate along the axial direction of the cylinder 310 with the help of the gravity of the collar 352 and the thrust of the slider 354. At the same time, the slider 354 will cyclically contact and separate from the collar 352 during the rotation process, thereby continuously impacting the collar 352, generating vibration, and assisting the powder to move downward in the gaps between the particles.

[0044] In the present invention, the spherical particles 360 are solid, and there is a problem of bridging and jamming between the particles. In order to avoid damage to the device when jamming occurs, in some embodiments, such as Figure 1 As shown, the partition plate 320 is fixedly connected to the cylinder 310, and the other end of the pull rod 351 passes through the partition plate 320 and is fixedly connected to the sieve plate 340. The sieve plate 340 and the cylinder 310 are in clearance fit, so that the pull rod 351 can be used to drive the sieve plate 340 to move back and forth in the cylinder 310. The pull rod 351 adopts an elastic telescopic rod, as shown in FIG. Figure 4 As shown, the elastic telescopic rod can be compressed or stretched by means of the elastic action of two sets of springs 500. When there is no jamming fault, the end of the pull rod 351 fixedly connected to the sieve plate 340 can move freely. At this time, due to the large force of the spring 500, the reciprocating pull rod 351 does not expand or contract. When a jamming fault occurs, the end of the pull rod 351 fixed to the sieve plate 340 is fixed. When the pull rod 351 moves, it will drive the spring 500 to expand and contract, avoiding forcibly pulling the sieve plate 340 and damaging the equipment. In other embodiments, such as Figure 5 and Figure 6As shown, the outer wall of the cylinder 310 is provided with a slip ring 600, and the other end of the pull rod 351 passes through the housing 230 of the screw conveyor 200 and is movably connected thereto, and the pull rod 351 passes through one end of the housing 230 and is fixedly connected to the slip ring 600, thereby driving the slip ring 600 to move axially along the cylinder 310. At the same time, the slip ring 600 and the screen plate 340 are magnetically attracted. Therefore, when there is no jamming fault, the two move synchronously; when jamming occurs, the two can move relative to each other without damaging the equipment. In addition, a limit block 700 is provided on the inner wall of the cylinder 310 to prevent the distance between the slip ring 600 and the screen plate 340 from being too large and the magnetic force from being insufficient when jamming occurs, causing the screen plate 340 to slip off the cylinder 310. At the same time, the screen plate 340 has a certain thickness to achieve the effect of straightening the screen plate 340 and prevent the screen plate 340 from tilting during movement, causing the spherical particles 360 to fall outside the cylinder 310. The magnetic attraction between the slip ring 600 and the sieve plate 340 can be achieved in a variety of ways, such as embedding mutually magnetically attracted materials on the two. Of course, reference can also be made to the configuration of magnetic devices such as magnetic pumps.

[0045] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in the embodiments of the present invention should be covered by the scope of protection of the present invention.

Claims

1. A polymer dry powder delivery device for fracturing, characterized in that: include: Vertically arranged hopper; a screw conveyor in communication with the hopper outlet; Granular material crushing structure, including: a cylinder arranged vertically and connected to the outlet of the screw conveyor; A partition plate is horizontally arranged in the cylinder, and two one-way valve groups are provided on the partition plate, and the two one-way valve groups respectively guide the material to flow in two opposite directions in the cylinder; a sieve plate arranged in the cylinder and below the partition plate; a plurality of spherical particles located in the cylinder and on the sieve plate, wherein the size of the spherical particles is larger than the sieve holes on the sieve plate, and the spherical particles can pass through the partition plate along the directions respectively defined by the two one-way valve groups; A power mechanism is used to push one of the partition plate and the sieve plate to move back and forth along the axial direction of the cylinder, wherein when the partition plate and the sieve plate move toward each other, the spherical particles are pushed to move upward and pass through the partition plate; when the partition plate and the sieve plate move in opposite directions, the spherical particles move downward under the action of their own gravity and pass through the partition plate.

2. A polymer dry powder conveying device for fracturing according to claim 1, characterized in that: The separation plate includes an inner ring and an outer ring, and the two one-way valve groups are arranged on the inner ring and the outer ring respectively, so that the spherical particles pass through the inner ring and the outer ring in opposite directions.

3. The polymer dry powder conveying device for fracturing according to claim 2, characterized in that: The one-way valve group on the inner ring is used to guide the spherical particles to flow in a one-way direction toward the sieve plate.

4. A polymer dry powder conveying device for fracturing according to claim 3, characterized in that: The spherical particles are stacked in the cylinder to form a packing bed, and each one-way valve group includes a plurality of one-way valves; in the one-way valve group on the outer ring, the outlets of at least some of the one-way valves are connected to the cylindrical conduit, and the height of at least some of the cylindrical conduits is higher than the height of the packing bed.

5. The polymer dry powder conveying device for fracturing according to claim 4, characterized in that: At least a portion of the outlet of the cylindrical conduit is located in the packed bed.

6. The polymer dry powder conveying device for fracturing according to claim 1, characterized in that: The power mechanism comprises: a pull rod arranged along the axial direction of the cylinder and capable of moving only along the axial direction of the cylinder; a collar fixed to one end of the pull rod; A rotating shaft coaxially and fixedly connected to the screw of the screw conveyor; a slider having one end fixedly connected to the rotating shaft and the other end extending radially along the rotating shaft; The screw drives the slider to rotate in the collar, and during the rotation, under the action of the gravity of the collar, the inner wall of the collar abuts against the slider or the rotating shaft.

7. The polymer dry powder conveying device for fracturing according to claim 6, characterized in that: A slip ring is sleeved on the outer wall of the cylinder, the other end of the pull rod passes through the shell of the screw conveyor and is movably connected thereto, and one end of the pull rod passes through the shell and is fixedly connected to the slip ring, thereby driving the slip ring to move axially along the cylinder; the slip ring and the screen plate are magnetically attracted to each other, so that the two move synchronously.

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