On-line mixing and batching device for dry powder thickening agent for fracturing

Abstract

The invention discloses an online dry powder thickening agent mixing and batching device for fracturing, and relates to the technical field of mixing devices, the online dry powder thickening agent mixing and batching device comprises a tank body, a propeller structure, a grinding structure and a driving structure, the tank body is provided with a liquid feeding port, a dry powder material feeding port and a discharging port, the propeller structure and the grinding structure are both located in the tank body, and the driving structure is located in the tank body. And the driving structure is used for driving the propeller structure and the grinding structure. According to the online mixing and batching device for the dry powder thickening agent for fracturing, the problems that the existing dry powder mixing device is easy to form powder dough and the thickening agent is accumulated to cause blockage are solved.

Description

Technical Field

[0001] The invention relates to the technical field of mixing devices, in particular to an online mixing and batching device for a dry powder thickener for fracturing. Background Art

[0002] As an important component of fracturing fluid, thickener can effectively increase the viscosity of fracturing fluid, improve its sand carrying capacity and fracture forming capacity, and improve oil recovery efficiency. Compared with traditional emulsion thickeners, dry powder thickeners have less pollution to the environment; are less affected by external factors, have higher stability; are easy to transport, and have good safety. Therefore, dry powder thickeners have broad application prospects in the field of petrochemicals.

[0003] The existing dry powder thickener mixing equipment has a series of problems, such as poor mixing effect of dry powder and liquid, easy formation of powder lumps, and easy accumulation of mixed thickener in the reaction chamber to cause blockage. Summary of the invention

[0004] The purpose of the present invention is to provide an online mixing and batching device for a dry powder thickener for fracturing, so as to solve the problem that the existing dry powder thickener mixing equipment is prone to form powder lumps and thickener accumulation causing blockage.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides an online mixing and batching device for a dry powder thickener for fracturing, comprising: a tank body, a propeller structure, a grinding structure and a driving structure, wherein the tank body is provided with a liquid feed port, a dry powder material feed port and a discharge port, the propeller structure and the grinding structure are both located in the tank body, and the driving structure is used for driving the propeller structure and the grinding structure.

[0007] Preferably, the liquid feed port corresponds to the propeller structure, the dry powder material feed port corresponds to the grinding structure, and the discharge port corresponds to the propeller structure.

[0008] Preferably, the propeller structure comprises a rotating shaft and a plurality of blades, the plurality of blades are arranged on the rotating shaft, and the driving structure is used for driving the rotating shaft to rotate.

[0009] Preferably, the outer edge of the blade is capable of contacting the inner wall of the tank.

[0010] Preferably, the grinding structure comprises an inner grinding component and an outer grinding component, the inner grinding component is located on the inner side of the outer grinding component, the driving structure is used to drive the inner grinding component and the outer grinding component to rotate relative to each other, and the outer surface of the inner grinding component and the inner surface of the outer grinding component are used to grind dry powder materials.

[0011] Preferably, the outer grinding assembly is annular, the outer grinding assembly is fixedly arranged on the inner surface of the tank body, and the driving structure is used to drive the inner grinding assembly to rotate.

[0012] Preferably, the inner grinding assembly is a herringbone gear, and the outer grinding assembly is a gear ring matching the inner grinding assembly.

[0013] Preferably, a partition structure is provided between the propeller structure and the grinding structure, the partition structure is sleeved on the rotating shaft, and there is a gap between the partition structure and the rotating shaft.

[0014] Preferably, the partition structure is a cylinder, one end of the partition structure is close to the propeller structure, the other end of the partition structure is close to the grinding structure, and the opening of one end of the partition structure is smaller than the opening of the other end of the partition structure.

[0015] Preferably, the liquid feed port is used to be connected to a liquid metering and conveying device, the dry powder material feed port is used to be connected to the dry powder metering and conveying device, and the discharge port is used to be connected to a subsequent thickener processing device.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] The present invention reduces the presence of powder lumps in the mixed thickener by providing a grinding structure and a propeller structure, and performs stirring in real time during the mixing process of the thickener, thereby avoiding the problem of thickener adhering to the tank wall or the inside of the pipeline to cause blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is an axonometric diagram of an online mixing and batching device for a dry powder thickener for fracturing according to the present invention;

[0020] Figure 2 It is a cross-sectional view of the online mixing and batching device of the dry powder thickener for fracturing of the present invention;

[0021] Figure 3 This is a schematic diagram of the application of the online mixing and batching device for the dry powder thickener for fracturing of the present invention;

[0022] Among them: 1. rear end cover; 2. tank body; 3. speed regulating motor; 4. coupling; 5. front end cover; 6. bolts; 7. grinding structure; 8. propeller structure; 9. rotating shaft; 10. liquid metering and conveying device; 11. dry powder metering and conveying device; 12. online mixing and batching device for dry powder thickener for fracturing; 201. liquid feed port; 202. dry powder material feed port; 203. partition structure; 204. discharge port; 701. inner grinding assembly; 702. outer grinding assembly. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The purpose of the present invention is to provide an online mixing and batching device for dry powder thickener for fracturing, so as to solve the problem that the existing dry powder mixing equipment is easy to form powder agglomerates and thickeners accumulate to cause blockage.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figures 1 to 3 As shown, this embodiment provides an online mixing and batching device 12 for a dry powder thickener for fracturing, comprising: a tank body 2, a propeller structure 8, a grinding structure 7 and a driving structure. The tank body 2 is a horizontally arranged cylindrical structure, and a liquid feed port 201, a dry powder material feed port 202 and a discharge port 204 are arranged on the tank body 2. The liquid feed port 201 and the dry powder material feed port 202 are located at the upper part of the tank body 2, and the discharge port 204 is located at the lower part of the tank body 2. A valve is installed at the discharge port 204. The propeller structure 8 and the grinding structure 7 are both located in the tank body 2, the liquid feed port 201 and the discharge port 204 both correspond to the propeller structure 8, the dry powder material feed port 202 corresponds to the grinding structure 7, the liquid feed port 201 is used to connect with the liquid metering and conveying device 10, the dry powder material feed port 202 is used to connect with the dry powder metering and conveying device 11, the discharge port 204 is used to connect with the subsequent thickener processing device, and the driving structure is used to drive the propeller structure 8 and the grinding structure 7.

[0027] Specifically, in this embodiment, a front end cover 5 and a rear end cover 1 are respectively provided at both ends of the tank body 2. A circular ring slightly larger than the inner diameter of the tank body 2 is provided at both ends of the tank body 2. The circular ring is provided with four threaded holes evenly arranged on the circular ring. The front end cover 5 and the rear end cover 1 are also provided with threaded holes, and the positions of the threaded holes are the same as those of the threaded holes of the circular ring. The front end cover 5 and the rear end cover 1 are respectively connected to the tank body 2 by bolts 6, and bearings are provided at the center positions of the front end cover 5 and the rear end cover 1.

[0028] In this embodiment, the driving structure includes a speed regulating motor 3 , and the speed regulating motor 3 is used to drive the propeller structure 8 and the grinding structure 7 .

[0029] In this embodiment, the propeller structure 8 includes a rotating shaft 9 and a plurality of blades, the plurality of blades are arranged on the rotating shaft 9 through splines, the axial positioning of the propeller structure 8 is achieved through the reasonable arrangement of the sleeve and the shaft shoulder, the outer edge of the blade can contact the inner wall of the tank body 2, the rotating shaft 9 is rotatably connected with the front end cover 5 and the rear end cover 1 respectively, the rotating shaft 9 is a stepped shaft, one end of the rotating shaft 9 extends out of the tank body 2 and is connected to the power output end of the motor through the coupling 4. The propeller structure 8 rotates at a high speed to form a negative pressure, attracting the dry powder to flow toward it, and mixing the dry powder and the liquid at the same time.

[0030] In this embodiment, the length of the grinding structure 7 is consistent with the dry powder material feed port 202, ensuring that all dry powders are fully ground. The grinding structure 7 includes an inner grinding component 701 and an outer grinding component 702. The outer grinding component 702 is fixedly arranged on the inner surface of the tank body 2 by welding. The inner grinding component 701 is located on the inner side of the outer grinding component 702. The inner diameter of the outer grinding component 702 is slightly larger than the outer diameter of the inner grinding component 701. The axial positioning of the inner grinding component 701 is achieved through the reasonable arrangement of the sleeve and the shoulder. The inner grinding component 701 is a herringbone gear, and the outer grinding component 702 is an annular gear ring matching the inner grinding component 701, or the inner grinding component 701 includes two gears with opposite rotation directions. The outer grinding assembly 702 includes two gear rings matching the inner grinding assembly 701. The outer grinding assembly 702 is provided with an inlet, which is connected to the dry powder material feed port 202 and is used to introduce the dry powder material into between the inner grinding assembly 701 and the outer grinding assembly 702. The tooth shape of the inner grinding assembly 701 and the outer grinding assembly 702 is set so that the dry powder can be adsorbed during feeding. The outer surface of the inner grinding assembly 701 and the inner surface of the outer grinding assembly 702 are used to grind the dry powder material. The motor drives the inner grinding assembly 701 to rotate through the rotating shaft 9, so that the inner grinding assembly 701 and the outer grinding assembly 702 rotate relative to each other, thereby grinding the dry powder material and eliminating the sticky powder mass.

[0031] In this embodiment, a partition structure 203 is arranged between the propeller structure 8 and the grinding structure 7, that is, the partition structure 203 is located between the dry powder material feed port 202 and the liquid feed port 201, the partition structure 203 is sleeved on the rotating shaft 9, and there is a gap between the partition structure 203 and the rotating shaft 9; the partition structure 203 is a hollow cylinder with different diameters at both ends, one end of the partition structure 203 is close to the propeller structure 8, and the other end of the partition structure 203 is close to the grinding structure 7, the opening at one end of the partition structure 203 is smaller than the opening at the other end of the partition structure 203, that is, the opening at one end of the partition structure 203 gradually increases toward the opening at the other end of the partition structure 203, and the other end of the partition structure 203 is connected to the inner wall of the tank body 2, and at the end of the partition structure 203 with a smaller inner diameter, due to the smaller flow area, the flow rate and diffusion effect of the dry powder are further increased.

[0032] The working principle of the online mixing and batching device 12 for fracturing dry powder thickener in this embodiment is as follows:

[0033] like Figure 3 As shown, the dry powder metering and conveying device 11 is connected to the dry powder material feed port 202, and the liquid metering and conveying device 10 is connected to the liquid feed port 201, and the dry powder and liquid (generally clean water) are conveyed to the online mixing and batching device 12 for the dry powder thickener for fracturing according to the calculated material ratio, and the feeding speed and feeding quantity of the dry powder and liquid are controlled. Generally, the dry powder metering and conveying device 11 is a star feeder, which can realize uniform and continuous feeding, and can be matched with a speed regulating motor according to the properties of the conveyed dry powder; the liquid metering and conveying device 10 is a vertical centrifugal pump, which conveys liquid from the liquid storage device to the online mixing and batching device 12 for the dry powder thickener for fracturing.

[0034] like Figure 2 As shown, after the dry powder material enters from the dry powder material feed port 202, it falls into the grinding structure 7. The inner grinding component 701 is installed on the rotating shaft 9, connected to the speed regulating motor 3, and rotates continuously; the outer grinding component 702 is fixed on the inner wall of the tank body 2 and remains stationary. The dry powder falls into the gap between the outer grinding component 702 and the inner grinding component 701. The dry powder material is fully ground under the continuous action of shear force and friction force, eliminating the powder agglomerates formed by the adhesion of the dry powder particles. During the grinding process, the grinding state of the dry powder can be observed through the observation hole set on the tank body 2, and the control panel of the speed regulating motor 3 is adjusted to rotate to the appropriate speed of the speed regulating motor 3, that is, the grinding speed.

[0035] Since the propeller structure 8 is installed on the rotating shaft 9, as the rotating shaft 9 rotates at a high speed, a large negative pressure is formed in the tank body 2. The dry powder material ground in the grinding structure 7 is attracted to the left and moves toward the propeller structure 8 through the barrier structure. As the flow area of ​​the barrier structure gradually decreases, the flow speed of the dry powder material is accelerated. At the same time, diffusion occurs at the outlet (the opening at one end of the partition structure 203), ensuring that the dry powder particles are evenly and fully in contact with the liquid.

[0036] When the dry powder particles move to the propeller structure 8, the liquid delivered by the liquid feed port 201 falls into the propeller structure 8 at the same time. Under the rotation and stirring of the propeller structure 8, the dry powder particles are fully in contact with the liquid and are continuously mixed to obtain a mixed thickener. During the mixing process, the barrier structure fixed on the tank body 2 prevents the thickener thrown out by the stirring from entering the grinding structure 7 and affecting the grinding process of the dry powder. The inclined side wall of the barrier structure can also prevent the thickener from adhering to its surface. At the same time, the propeller structure 8 will scrape the inside of the tank body 2 during the stirring process to prevent the thickener from adhering to the inside of the tank body 2 or the discharge port 204.

[0037] The discharge port 204 is connected to the discharge pipeline. When the online mixing and batching device 12 for fracturing dry powder thickener of this embodiment is used, the valve of the discharge port 204 is opened, and the mixed thickener can enter the discharge pipeline and be transported to the mixing vehicle, so that the thickener can be prepared and used immediately. The inner diameter of the discharge pipeline is generally 10-12 cm and the length is 10-15 m.

[0038] The present invention is provided with a grinding structure 7. Before the dry powder is mixed with the liquid, the dry powder is firstly ground to eliminate possible powder lumps and ensure that the dry powder particles are not adhered to each other so as to fully contact with the liquid, which is beneficial to the mixing of the thickener.

[0039] The present invention uses a speed regulating motor 3 to provide power, and an observation hole is provided on the tank body 2. By observing the grinding state of the dry powder, the control panel of the speed regulating motor 3 is adjusted to rotate at a suitable speed to ensure that the dry powder material is fully ground and all powder lumps are eliminated as much as possible, which is convenient for the subsequent mixing operation of the dry powder and the liquid.

[0040] The present invention is provided with a barrier structure, which is a hollow cylindrical structure with a gradually decreasing inner diameter, and the tube wall thickness remains unchanged at 2 mm, with a simple structure and a small weight. Since the flow area of ​​the dry powder is reduced, the flow velocity of the dry powder at the outlet is accelerated, and the diffusion effect is enhanced, which is conducive to a more complete contact with the liquid. At the same time, the barrier structure prevents the dry powder thickener from dripping onto the grinding structure 7 during the mixing process, affecting the grinding process of the dry powder.

[0041] The present invention is provided with a propeller structure 8, which forms negative pressure with the high-speed rotation of the rotating shaft 9 to attract the movement of the dry powder material. The movement effect of the dry powder is stronger than that of the traditional Venturi tube; the propeller structure 8 also stirs the thickener in the mixing process to prevent the thickener from adhering to the pipeline and causing blockage; at the same time, the propeller structure 8 is also powered by the speed regulating motor 3, and can rotate at different speeds according to the amount of dry powder input to ensure an appropriate dry powder flow rate.

[0042] The present invention is easy to install and disassemble. The front and rear end covers 1 are connected to the tank body 2 by bolts 6, which is convenient for disassembly to clean or maintain the inside of the tank body 2; the propeller structure 8 and the grinding structure 7 can also be removed from the rotating shaft 9, which is convenient for replacing parts or maintenance.

[0043] The present invention has a simple structure and fewer parts. At the same time, the size and weight of the entire device are small, the parts are interchangeable, and there are many application scenarios. It can be used fixedly or installed on a mobile device. The device can be connected to other hybrid devices and has broad application prospects.

[0044] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The specific size and production capacity of the device can be adjusted according to actual needs. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An online mixing and batching device for dry powder thickener for fracturing, characterized by: include: A tank body, a propeller structure, a grinding structure and a driving structure, wherein the tank body is provided with a liquid feed port, a dry powder material feed port and a discharge port, the propeller structure and the grinding structure are both located in the tank body, and the driving structure is used to drive the propeller structure and the grinding structure.

2. The online mixing and batching device for dry powder thickener for fracturing according to claim 1 is characterized in that: The liquid feed port corresponds to the propeller structure, the dry powder material feed port corresponds to the grinding structure, and the discharge port corresponds to the propeller structure.

3. The online mixing and batching device for dry powder thickener for fracturing according to claim 1 is characterized in that: The propeller structure comprises a rotating shaft and a plurality of blades, wherein the plurality of blades are arranged on the rotating shaft, and the driving structure is used for driving the rotating shaft to rotate.

4. The online mixing and batching device for dry powder thickener for fracturing according to claim 3 is characterized in that: The outer edge of the blade can contact the inner wall of the tank.

5. The online mixing and batching device for dry powder thickener for fracturing according to claim 1, characterized in that: The grinding structure includes an inner grinding component and an outer grinding component, wherein the inner grinding component is located on the inner side of the outer grinding component, and the driving structure is used to drive the inner grinding component and the outer grinding component to rotate relative to each other, and the outer surface of the inner grinding component and the inner surface of the outer grinding component are used to grind dry powder materials.

6. The online mixing and batching device for dry powder thickener for fracturing according to claim 5, characterized in that: The outer grinding assembly is annular and is fixedly arranged on the inner surface of the tank body. The driving structure is used to drive the inner grinding assembly to rotate.

7. The on-line mixing and batching device for dry powder thickener for fracturing according to claim 5, characterized in that: The inner grinding component is a herringbone gear, and the outer grinding component is a gear ring matching the inner grinding component.

8. The on-line mixing and batching device for dry powder thickener for fracturing according to claim 3, characterized in that: A partition structure is provided between the propeller structure and the grinding structure. The partition structure is sleeved on the rotating shaft, and a gap exists between the partition structure and the rotating shaft.

9. The online mixing and batching device for dry powder thickener for fracturing according to claim 8, characterized in that: The partition structure is a cylinder, one end of the partition structure is close to the propeller structure, the other end of the partition structure is close to the grinding structure, and the opening of one end of the partition structure is smaller than the opening of the other end of the partition structure.

10. The online mixing and batching device for dry powder thickener for fracturing according to claim 1, characterized in that: The liquid feed port is used to be connected to a liquid metering and conveying device, the dry powder material feed port is used to be connected to the dry powder metering and conveying device, and the discharge port is used to be connected to a subsequent thickener processing device.

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