Micro-molecular recyclable self-cleaning fracturing fluid mixing device

Abstract

The utility model discloses a micromolecule recyclable self-cleaning fracturing fluid mixing device which comprises a mixing box, a batching chamber, a stirring chamber and a crushing chamber which are communicated with one another are sequentially arranged in the mixing box from top to bottom, and a premixing structure is arranged between the batching chamber and the stirring chamber. The premixing structure is used for carrying out primary stirring and mixing on powder, water and additives added into the batching chamber, then conveying the powder, the water and the additives into the stirring chamber, carrying out secondary stirring and mixing through a stirring assembly arranged in the stirring chamber and then conveying the powder, the water and the additives into the crushing chamber, and a powder ball crushing structure is arranged in the crushing chamber and comprises a screw rod and a filter cylinder; materials are sprayed to the filter cartridge through the screw rod under the action of centrifugal force, so that the fisheye-shaped powder-in-water dough is broken after impacting the surface of the filter cartridge, and powder and additives wrapped in the fisheye-shaped powder-in-water dough are quickly mixed with water under the disturbance of water flow, so that the mixing quality of the clean fracturing fluid is improved.

Description

Technical Field

[0001] The utility model relates to a small molecule circulatory self-cleaning fracturing fluid mixing device, belonging to the technical field of fracturing fluid mixing. Background Art

[0002] Clean fracturing fluid is a very critical part of hydraulic fracturing operations. Its performance is directly related to the fracturing effect of oil and gas and well formations. Therefore, controlling the quality of clean fracturing fluid has become a top priority in oil production. The commonly used liquid distribution control method is the traditional electric control technology. According to the production process of clean fracturing fluid, the amount of clean water, rubber powder and various additives is calculated according to the liquid distribution requirements before the liquid distribution. The weighed plant glue thickener is manually transported to the front of the discharge hopper, and the measured material powder is poured into the discharge hopper bag by bag. Then the corresponding valve of the selected liquid distribution tank is opened, and the water pump and the discharge equipment are manually started in sequence. At this time, the rubber powder is sucked into the water by the negative pressure generated by the ejector, and the water-powder mixing is achieved by the stirring equipment. However, a large number of "fish-eye" type water-powder clumps will be formed at the moment of preparation. It is difficult to break such water-powder clumps in the existing mixing device relying only on the stirring blades, thereby affecting the mixing quality of the clean fracturing fluid. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a small molecule circulatory self-cleaning fracturing fluid mixing device to solve the technical problems mentioned in the prior art.

[0004] A small molecule circulatory self-cleaning fracturing fluid mixing device, comprising a mixing box, wherein the mixing box is provided with a batching chamber, a stirring chamber and a crushing chamber which are interconnected from top to bottom, and a premixing structure is provided between the batching chamber and the stirring chamber, wherein the premixing structure is used to stir and mix the powder, water and additives added in the batching chamber once and then send them to the stirring chamber, and stir and mix them twice through a stirring assembly provided in the stirring chamber and then send them to the crushing chamber;

[0005] The crushing chamber is provided with a dough crushing structure, and the dough crushing structure comprises:

[0006] A screw rod, one end of which is mounted on the bottom end of the crushing chamber, the other end of which passes through the top end of the crushing chamber and is connected to one end of a transmission shaft, the other end of which passes through the stirring chamber and the batching chamber in sequence, and passes through the top end of the mixing box and is provided with a power unit;

[0007] A filter cartridge, the two ends of which are respectively connected to the upper and lower ends of the crushing chamber, the filter cartridge is sleeved on the outer side wall of the spiral rod, and a gap is provided between the inner side wall of the filter cartridge and the outer side wall of the spiral rod;

[0008] The stirring assembly is installed on the transmission shaft, and the power unit is used to drive the stirring assembly and the screw rod to rotate through the transmission shaft to stir the material, and spray the material on the screw rod onto the filter cartridge under the action of centrifugal force to crush it.

[0009] Optionally, the premix structure is installed between the batching chamber and the stirring chamber through two groups of liner plates, the circumferential sides of the liner plates are fixedly connected to the inner wall of the mixing box, the two groups of liner plates are arranged in parallel, and one group of the liner plates is installed at the bottom end of the batching chamber, and the other group of the liner plates is installed at the top end of the stirring chamber. The premix structure includes:

[0010] A trapezoidal water tank, wherein the trapezoidal water tank is arranged between two groups of the lining plates, and the top plate of the trapezoidal water tank is smaller than the bottom plate, a feed port is arranged at the top of the trapezoidal water tank, the feed port penetrates one group of the lining plates and communicates with the batching chamber, and a discharge port is arranged at the bottom of the trapezoidal water tank, the discharge port penetrates another group of the lining plates and communicates with the stirring chamber;

[0011] A fixing rod, both ends of which are respectively mounted on the inner side walls of the trapezoidal water tank, and a central axis of the fixing rod is arranged perpendicular to a central axis of the transmission shaft;

[0012] A stirring shaft, the stirring shaft is a hollow rod, the stirring shaft is sleeved and mounted on the fixed rod, and a plurality of blades are evenly mounted on the outer circumference of the stirring shaft along the circumferential direction;

[0013] The feed inlet is tilted toward one side of the stirring shaft, and is used to make the material in the batching chamber flow to one side of the stirring shaft to impact the rotation of the blades to perform primary stirring and mixing of the material.

[0014] Optionally, the stirring chamber is separated from the crushing chamber by a partition plate, and a feed opening is provided on the partition plate. The feed opening is used to connect the stirring chamber with the crushing chamber, and the feed opening is located directly above the screw rod.

[0015] Optionally, the stirring assembly includes a plurality of stirring plates, and one end of the plurality of stirring plates is evenly mounted on the side wall of the transmission shaft along the circumferential direction.

[0016] Optionally, a feeding port is provided at the top of the batching chamber, a water injection port is provided on a side of the side wall of the batching chamber close to the feeding port, and the water injection port intersects with the central axis of the feeding port at one point;

[0017] A discharge port is arranged at the bottom end of the side wall of the crushing chamber.

[0018] Optionally, the feed port is smaller than the discharge port.

[0019] Optionally, the volume of the crushing chamber is greater than the sum of the volumes of the batching chamber and the stirring chamber.

[0020] The beneficial effects that the utility model can produce include:

[0021] The utility model provides a small molecule circulatory self-cleaning fracturing fluid mixing device. The premix structure is used to mix powder, water and additives once, so that the "fish-eye" type powder-in-water agglomerates in water can be reduced. The mixed materials flow into the mixing chamber along with the water flow, so that the formed "fish-eye" type powder-in-water agglomerates can be prevented from floating on the water surface and being difficult to be crushed. The stirring assembly is then used to mix the powder, water and additives twice, so that the powder, water and additives are fully mixed, and some "fish-eye" type powder-in-water agglomerates are crushed and flow into the crushing chamber. The material is sprayed onto the filter cartridge by the spiral rod under the action of centrifugal force, so that the "fish-eye" type powder-in-water agglomerates collide with the surface of the filter cartridge and break, and the powder and additives wrapped therein are quickly mixed with water under the disturbance of the water flow. At the same time, the spiral rod disturbs the water flow at the bottom of the crushing chamber, so that the water flow continuously passes through the filter cartridge, and the "fish-eye" type powder-in-water agglomerates that have not been broken can be further broken through the filter holes on the surface of the filter cartridge, thereby improving the mixing quality of the clean fracturing fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of a small molecule circulatory self-cleaning fracturing fluid mixing device of the utility model;

[0023] In the figure: 1. mixing box, 2. batching chamber, 3. stirring chamber, 4. crushing chamber, 5. screw rod, 6. transmission shaft, 7. filter cartridge, 8. power unit, 9. lining plate, 10. trapezoidal water tank, 11. feed inlet, 12. discharge port, 13. fixing rod, 14. stirring shaft, 15. blade, 16. partition plate, 17. feed outlet, 18. stirring plate, 19. feeding port, 20. water injection port, 21. discharge port. DETAILED DESCRIPTION

[0024] The present invention is described in detail below in conjunction with embodiments, but the present invention is not limited to these embodiments.

[0025] like Figure 1As shown, the utility model provides a small molecule circulatory self-cleaning fracturing fluid mixing device, comprising a mixing box 1, wherein the mixing box 1 is provided with a batching chamber 2, a stirring chamber 3 and a crushing chamber 4 which are interconnected from top to bottom, and a premixing structure is installed between the batching chamber 2 and the stirring chamber 3, and the premixing structure is used to stir and mix the powder, water and additives added in the batching chamber 2 once and then send them to the stirring chamber 3, and stir and mix them twice through the stirring assembly provided in the stirring chamber 3 and then send them to the crushing chamber 4;

[0026] A dough crushing structure is provided in the crushing chamber 4, and the dough crushing structure includes:

[0027] A screw rod 5, one end of which is rotatably mounted on the bottom end of the crushing chamber 4 through a bearing, the other end of which passes through the top end of the crushing chamber 4 and is connected to one end of a transmission shaft 6, the other end of which passes through the stirring chamber 3 and the batching chamber 2 in sequence, and passes through the top end of the mixing box 1 to be provided with a power unit 8, wherein the power unit 8 adopts a reducer, the reducer is fixedly mounted on the top end of the mixing box 1 by bolts, and the output shaft of the reducer is fixedly connected to the transmission shaft 6 by a coupling;

[0028] The filter cartridge 7 has two ends connected to the upper and lower ends of the crushing chamber 4 respectively, and the filter cartridge 7 is sleeved on the outer wall of the spiral rod 5, and a gap is provided between the inner wall of the filter cartridge 7 and the outer wall of the spiral rod 5;

[0029] The stirring assembly is mounted on the transmission shaft 6. The power unit 8 is used to drive the stirring assembly and the screw rod 5 to rotate through the transmission shaft 6 to stir the material, and spray the material on the screw rod 5 onto the filter cartridge 7 for crushing under the action of centrifugal force.

[0030] In the above, the powder, water and additives are stirred and mixed once by the premix structure, which can reduce the formation of "fish-eye" type water-in-powder agglomerates in the water, and the mixed materials flow into the stirring chamber 3 with the water flow, which can avoid the formed "fish-eye" type water-in-powder agglomerates floating on the water surface and being difficult to break. The powder, water and additives are stirred and mixed for the second time by the stirring assembly, so that the powder, water and additives are fully mixed and some "fish-eye" type water-in-powder agglomerates are broken and flow into the crushing chamber 4. The material is sprayed onto the filter cartridge 7 by the spiral rod 5 under the action of centrifugal force, so that the "fish-eye" type water-in-powder agglomerates hit the surface of the filter cartridge 7 and break, and the powder and additives wrapped inside are quickly mixed with water under the disturbance of the water flow. At the same time, the spiral rod 5 disturbs the water flow at the bottom of the crushing chamber 4, so that the water flow continuously passes through the filter cartridge 7, and the "fish-eye" type water-in-powder agglomerates that have not been broken can be further broken through the filter holes on the surface of the filter cartridge 7, thereby improving the mixing quality of the clean fracturing fluid.

[0031] Further, the premix structure is installed between the batching chamber 2 and the stirring chamber 3 through two groups of lining plates 9, and the circumference of the lining plates 9 is fixedly connected to the inner wall of the mixing box 1. The two groups of lining plates 9 are arranged in parallel, and one group of lining plates 9 is installed at the bottom end of the batching chamber 2, and the other group of lining plates 9 is installed at the top end of the stirring chamber 3. The premix structure includes:

[0032] A trapezoidal water tank 10 is installed between two groups of lining plates 9, and the top plate of the trapezoidal water tank 10 is smaller than the bottom plate. A feed port 11 is provided at the top of the trapezoidal water tank 10, and the feed port 11 penetrates one group of lining plates 9 and communicates with the batching chamber 2. A discharge port 12 is provided at the bottom of the trapezoidal water tank 10, and the discharge port 12 penetrates another group of lining plates 9 and communicates with the mixing chamber 3.

[0033] A fixing rod 13, both ends of which are fixedly mounted on the inner side wall of the trapezoidal water tank 10, and the central axis of the fixing rod 13 is perpendicular to the central axis of the transmission shaft 6;

[0034] A stirring shaft 14, which is a hollow rod, is sleeved and mounted on the fixed rod 13, and a plurality of blades 15 are evenly mounted on the outer circumference of the stirring shaft 14 along the circumferential direction;

[0035] The feed port 11 is inclined toward one side of the stirring shaft 14, and is used to direct the material in the batching chamber 2 to flow toward one side of the stirring shaft 14 to impact the blade 15 to rotate and stir and mix the material once, and then flow into the stirring chamber 3 from the discharge port 12. In the process of the water flow impacting the rotation of the blade 15, the flow rate of the water flow can be slowed down, so that the powder, additives and water are fully mixed, and at the same time, the "fish-eye" type water-in-powder dough formed in the batching chamber 2 is impacted on the blade 15, which is conducive to breaking up some of the "fish-eye" type water-in-powder dough, thereby reducing the formation of the "fish-eye" type water-in-powder dough.

[0036] Furthermore, the stirring chamber 3 and the crushing chamber 4 are separated by a partition plate 16, and a discharge port 17 is provided on the partition plate 16. The discharge port 17 is used to connect the stirring chamber 3 with the crushing chamber 4, and the discharge port 17 is located directly above the screw rod 5 to ensure that the mixed medium in the stirring chamber 3 flows into the screw rod 5.

[0037] Furthermore, the stirring assembly includes a plurality of stirring plates 18 , one end of each of which is uniformly welded to the side wall of the transmission shaft 6 along the circumferential direction to stir and mix the materials in the stirring chamber 3 .

[0038] Furthermore, a feeding port 19 is provided at the top of the batching chamber 2 for installing a material box, and a water injection port 20 is provided on a side of the side wall of the batching chamber 2 near the feeding port 19 for installing a water inlet pipe. The water injection port 20 intersects with the central axis of the feeding port 19 at one point, so that the powder discharged from the feeding port 19 quickly flows into the feeding port 11 along with the water flowing out of the water injection port 20;

[0039] A discharge port 21 is provided at the bottom end of the side wall of the crushing chamber 4 for installing a fracturing fluid output pipeline to discharge the mixed fracturing fluid through the output pipeline.

[0040] In the above, if the output pipeline is not equipped with a control valve, a corresponding control valve needs to be installed at the discharge port 21 to facilitate controlling the stirring time of the material in the crushing chamber 4.

[0041] Furthermore, the feed port 11 is smaller than the discharge port 12 , so as to ensure that the material in the trapezoidal water tank 10 is discharged in time, and to prevent the material from forming resistance in the trapezoidal water tank 10 and affecting the rotation of the stirring shaft 14 .

[0042] Furthermore, the volume of the crushing chamber 4 is greater than the sum of the volumes of the batching chamber 2 and the stirring chamber 3, so that the materials added in batches into the batching chamber 2 all flow into the crushing chamber 4 after being stirred and mixed by the premix structure and the stirring assembly, and are further stirred by the screw rod 5, which is used to centrally stir the materials after dispersed mixing, so that the materials are mixed more fully.

[0043] The above are only several embodiments of the utility model, and do not limit the utility model in any form. Although the utility model is disclosed as above in the preferred embodiments, it is not used to limit the utility model. Any technician familiar with this profession, without departing from the scope of the technical solution of the utility model, makes slight changes or modifications using the technical contents disclosed above, which are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A small molecule circulatory self-cleaning fracturing fluid mixing device, comprising a mixing box (1), characterized in that: The mixing box (1) is provided with a batching chamber (2), a stirring chamber (3) and a crushing chamber (4) which are interconnected from top to bottom. A premixing structure is provided between the batching chamber (2) and the stirring chamber (3). The premixing structure is used to stir and mix the powder, water and additives added to the batching chamber (2) once and then send them to the stirring chamber (3). The premixing structure is used to stir and mix the powder, water and additives added to the batching chamber (2) once and then send them to the stirring chamber (3). The premixing structure is used to stir and mix the powder, water and additives added to the mixing chamber (2) twice and then send them to the crushing chamber (4). The crushing chamber (4) is provided with a dough crushing structure, and the dough crushing structure comprises: A screw rod (5), one end of the screw rod (5) is mounted on the bottom end of the crushing chamber (4), the other end of the screw rod (5) passes through the top end of the crushing chamber (4) and is connected to one end of a transmission shaft (6), the other end of the transmission shaft (6) passes through the stirring chamber (3) and the batching chamber (2) in sequence, and passes through the top end of the mixing box (1) and is provided with a power unit (8); A filter cartridge (7), the two ends of which are respectively connected to the upper and lower ends of the crushing chamber (4), the filter cartridge (7) being sleeved on the outer wall of the spiral rod (5), and a gap being provided between the inner wall of the filter cartridge (7) and the outer wall of the spiral rod (5); The stirring assembly is mounted on the transmission shaft (6), and the power unit (8) is used to drive the stirring assembly and the screw rod (5) to rotate through the transmission shaft (6) to stir the material, and to spray the material on the screw rod (5) onto the filter cartridge (7) under the action of centrifugal force to crush it.

2. A small molecule circulatory self-cleaning fracturing fluid mixing device according to claim 1, characterized in that: The premix structure is installed between the batching chamber (2) and the stirring chamber (3) through two groups of lining plates (9), the circumferential sides of the lining plates (9) are fixedly connected to the inner wall of the mixing box (1), the two groups of lining plates (9) are arranged in parallel, and one group of the lining plates (9) is installed at the bottom end of the batching chamber (2), and the other group of the lining plates (9) is installed at the top end of the stirring chamber (3). The premix structure comprises: A trapezoidal water tank (10), wherein the trapezoidal water tank (10) is arranged between two groups of lining plates (9), and the top plate of the trapezoidal water tank (10) is smaller than the bottom plate; a feed port (11) is arranged at the top of the trapezoidal water tank (10), and the feed port (11) passes through one group of the lining plates (9) and is connected to the batching chamber (2); a discharge port (12) is arranged at the bottom of the trapezoidal water tank (10), and the discharge port (12) passes through another group of the lining plates (9) and is connected to the stirring chamber (3); A fixing rod (13), the two ends of which are respectively mounted on the inner side walls of the trapezoidal water tank (10), and the central axis of the fixing rod (13) is arranged perpendicular to the central axis of the transmission shaft (6); A stirring shaft (14), wherein the stirring shaft (14) is a hollow rod, the stirring shaft (14) is sleeved and mounted on the fixed rod (13), and a plurality of blades (15) are evenly mounted on the outer circumference of the stirring shaft (14) along the circumferential direction; The feed port (11) is arranged to be inclined toward one side of the stirring shaft (14) so ​​as to direct the material in the batching chamber (2) to flow toward one side of the stirring shaft (14) to impact the blades (15) to rotate and perform primary stirring and mixing of the material.

3. A small molecule circulatory self-cleaning fracturing fluid mixing device according to claim 1, characterized in that: The stirring chamber (3) and the crushing chamber (4) are separated by a partition plate (16), and a feed opening (17) is provided on the partition plate (16). The feed opening (17) is used to connect the stirring chamber (3) and the crushing chamber (4), and the feed opening (17) is located directly above the screw rod (5).

4. A small molecule circulatory self-cleaning fracturing fluid mixing device according to claim 1, characterized in that: The stirring assembly comprises a plurality of stirring plates (18), one end of each of the plurality of stirring plates (18) being evenly mounted on the side wall of the transmission shaft (6) along a circumferential direction.

5. A small molecule circulatory self-cleaning fracturing fluid mixing device according to claim 1, characterized in that: A feeding port (19) is provided at the top of the batching chamber (2), and a water injection port (20) is provided on a side of the side wall of the batching chamber (2) close to the feeding port (19), wherein the water injection port (20) intersects with the central axis of the feeding port (19) at one point; A discharge port (21) is provided at the bottom end of the side wall of the crushing chamber (4).

6. A small molecule circulatory self-cleaning fracturing fluid mixing device according to claim 2, characterized in that: The feed port (11) is smaller than the discharge port (12).

7. A small molecule circulatory self-cleaning fracturing fluid mixing device according to claim 1, characterized in that: The volume of the crushing chamber (4) is greater than the sum of the volumes of the batching chamber (2) and the stirring chamber (3).

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