Sand adding device for wet sand for fracturing
By designing sand collection bins, conveying systems, and storage bins, and combining screw conveyors and variable frequency motor control, the problems of easy blockage and wear during wet sand conveying were solved, achieving stable conveying of wet sand with high moisture content and improving the wear resistance of equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-10
- Publication Date
- 2026-05-08
AI Technical Summary
Existing sand-adding devices are prone to sand sticking and arching when conveying wet sand with a moisture content exceeding 5%, leading to conveying interruptions. Furthermore, the clay minerals in the wet sand exacerbate the wear of conveying components, affecting equipment lifespan and sand-adding efficiency.
A sand-adding device was designed, comprising a sand collection bin, a conveying system, and a sand storage bin. A screw conveyor and a variable frequency motor are used to control the conveying of wet sand. Combined with an air cannon and a controller, the device ensures uniform mixing and stable conveying of wet sand. Tungsten carbide wear-resistant layer and polymer wear-resistant liner are used to improve the wear resistance of the equipment.
It effectively handles wet sand with a moisture content of up to 15%, ensuring that the sand addition rate remains stable within ±3% of the set value, preventing clogging, extending the service life of the equipment, and improving cleaning and maintenance efficiency.
Smart Images
Figure CN121990313A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of oil and gas extraction equipment, and particularly to a sand feeding device for wet sand used in fracturing. Background Technology
[0002] Currently, unconventional oil and gas reservoirs account for a significant portion of resources and possess abundant potential. However, due to the high difficulty of extraction, a large amount of these resources remain untapped. With the ever-expanding demand for oil resources, the exploration and development of unconventional oil and gas reservoirs is urgently needed. In the fracturing process of unconventional oil and gas extraction, the proppant feeding device is a crucial component of the fracturing equipment system, and its performance directly affects the fracturing effect and extraction efficiency. However, current proppant feeding devices are prone to proppant adhesion and arching when conveying wet proppant with a moisture content exceeding 5%, leading to delivery interruptions. Gravity feeding methods are significantly affected by changes in proppant moisture content, making it difficult to ensure uniform proppant-liquid mixing. Furthermore, clay minerals in wet proppant exacerbate wear on conveying components, shortening equipment lifespan. Residual wet proppant, after hardening inside the equipment, is difficult to remove, affecting the quality of subsequent operations. Therefore, there is an urgent need to develop a new device capable of directly processing high-moisture fracturing proppant and ensuring continuous and stable proppant feeding. Summary of the Invention
[0003] To address the technical problems existing in the prior art, this invention proposes a sand feeding device for wet sand used in fracturing, comprising: a sand collection bin, which includes a first bin body, a discharge platform connected to the first bin body, and a first conveying device, the first conveying device being arranged parallel to the horizontal plane at the bottom of the first bin body; wherein the first bin body includes an opening, and a discharge truck pours wet sand from the discharge platform into the opening of the first bin body, which is then conveyed to the outside of the first discharge port of the first bin body via the first conveying device; and a conveying system, which includes a second conveying device and a third conveying device, the second and third conveying devices being arranged perpendicular to the horizontal plane. The third transmission device is set at a higher height than the second transmission device. The second transmission device is connected to the first discharge port of the first silo. The third transmission device is connected to the second transmission device. The sand storage silo includes a second silo and a fourth transmission device. The second silo is connected to the third transmission device, and the fourth transmission device is set at the second discharge port of the second silo. A first air cannon and a second air cannon are respectively set near the bottom of the first silo and the second silo. The outlets of the first air cannon and the second air cannon face the bottom of the first silo and the second silo, and input compressed air into the first silo and the second silo.
[0004] As described above, the first, second, third, and fourth transmission devices are screw conveyors; the screw conveyor includes a tube and a helical column disposed in the tube, and multiple rotating blades are disposed on the helical column; wherein the diameter of the tube is 300-600 mm; and the inclination angle of the rotating blades is 5-45 degrees.
[0005] In the sand-adding device described above, the surface of the rotating blades is coated with a tungsten carbide wear-resistant layer.
[0006] As described above, the sand adding device includes a screw conveyor with a drive unit; wherein the drive unit is a variable frequency motor with a power of 15-75kw and a speed of 80-350rpm.
[0007] The sand-adding device described above includes a sealing layer between the pipe body and the spiral column, and a guide channel between the pipe body and the sealing layer for guiding water from the pipe body to the outside of the pipe body.
[0008] In the sand-adding device described above, the inner wall of the second chamber is provided with a polymer wear-resistant liner, and the surface of the liner is provided with micro-raised turbulence patterns.
[0009] The sand-adding device described above further includes a controller for controlling the first transmission device, the second transmission device, the third transmission device, the fourth transmission device, the first air cannon, and the second air cannon.
[0010] The sand adding device described above further includes: one or more humidity sensors, which are disposed in the first chamber and / or the second chamber, and are used to collect humidity parameters of the wet sand and upload the collected parameters to the controller.
[0011] The sand adding device described above further includes: a material level detection device, which is installed in the second hopper and is used to detect the amount of wet sand in the second hopper and upload the detection result to the controller.
[0012] The sand adding device described above further includes: a discharge detection device, which is installed at the second discharge port and is used to detect the discharge status and upload the detection result to the controller.
[0013] The sand adding device of this application can effectively handle wet sand with a moisture content of up to 15%, and the sand adding rate can be kept stable within ±3% of the set value. It will not cause clogging and can continuously and stably transport wet sand. Attached Figure Description
[0014] The preferred embodiments of the present invention will now be described in further detail with reference to the accompanying drawings, wherein: Figure 1A and Figure 1B This is a schematic diagram of a sand-adding device according to an embodiment of this application; Figure 2 This is a schematic diagram of a sand collection bin structure according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a conveying system according to an embodiment of this application; Figure 4 A schematic diagram of a sand storage silo structure according to an embodiment of this application; and Figure 5 This is a block diagram of the control structure of a sand-adding device according to an embodiment of this application. Detailed Implementation
[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0016] In the following detailed description, reference can be made to the accompanying drawings, which form part of this application and illustrate specific embodiments of the present application. In the drawings, similar reference numerals describe substantially similar components in different figures. Specific embodiments of the present application are described in sufficient detail below to enable those skilled in the art to implement the technical solutions of the present application. It should be understood that other embodiments may also be utilized, or structural, logical, or electrical changes may be made to the embodiments of the present application.
[0017] This application discloses a sand-addition device for conveying wet sand used in fracturing, comprising a sand collection bin, a sand storage bin, a conveying system, a drive system, and a control system. The conveying system transports wet sand from the collection bin to the storage bin, the drive system provides power to the conveying system, and the control system controls the drive system. This sand-addition device can effectively handle wet sand with a moisture content up to 15%, and the sand-addition rate can be stably maintained within ±3% of a set value.
[0018] The technical solutions of this application are further illustrated below through specific embodiments. Those skilled in the art should understand that, based on the teachings of the following embodiments, other alternative solutions capable of achieving the same or similar functions are possible. These alternative solutions are also within the protection scope of this application.
[0019] Figure 1 is a schematic diagram of a sand-adding device according to an embodiment of this application.
[0020] As shown in the figure, the sand feeding device 100 includes a sand collection bin 110, a conveying system 120, and a sand storage bin 130. The sand collection bin 110 is used to collect wet sand (also referred to as "material"), specifically, high-moisture-content quartz sand is directly unloaded into the sand collection bin by a dump truck. The conveying system 120 is located between the sand collection bin 110 and the sand storage bin 130, and can transport the wet sand collected in the sand collection bin 110 to the sand storage bin 130. The sand storage bin 130 is used to temporarily store the collected wet sand, thereby ensuring a continuous supply of materials during subsequent fracturing operations.
[0021] Combination Figure 2 , Figure 2 This is a schematic diagram of a sand collection silo structure according to an embodiment of this application. In some embodiments, the sand collection silo 110 includes a silo body 111 and a discharge platform 112 connected to the silo body 111. The discharge platform 112 abuts against one side of the silo body 111, and the discharge platform is higher the closer it is to the silo body 111, so as to facilitate the dump truck to discharge wet sand into the silo body 111. In some embodiments, the silo body 111 includes an opening 1111 facing the discharge platform, which facilitates the dump truck to unload wet sand into the silo body 111. In some embodiments, the silo body 111 includes a first plane 1112 and a second plane 1113, wherein the first plane 1112 extends obliquely from a position near the bottom of the silo towards the side near the discharge platform, and the second plane 1113 extends obliquely from a position near the bottom of the silo 1114 towards the side away from the discharge platform. The angle α between the first plane 1112 and the horizontal plane is smaller than the angle β between the second plane 1113 and the water surface, so that the opening 1111 of the bin body 111 faces the unloading platform for easy unloading. In some embodiments, the first plane and the second plane form a gap 1116 near the bottom of the bin, which can be used to let wet sand fall to the bottom of the bin.
[0022] In some embodiments, the sand collection bin 110 may further include a first conveying device 113, which is disposed parallel to the horizontal plane at the bottom 1114 of the bin and can convey the wet sand leaking through the gap 1116 to the outside of the sand collection bin. In some embodiments, the first conveying device 113 may be a screw conveyor, which is placed horizontally across the entire bottom of the sand collection bin and can convey the wet sand in the sand collection bin to the outlet 1115 of the bin body.
[0023] In some embodiments, the first conveying device 113 may include a tube body 1131 and a spiral column 1132 disposed within the tube body. The tube body 1131 may include an inlet and an outlet. The inlet is disposed on the tube wall and is opposite to the gap 1116. The spiral column 1132 is provided with a plurality of spiral blades 1135, which can rotate within the tube body 1131 to convey wet sand leaking from the inlet to the outlet. The outlet may be one end of the tube body. The tube body 1131 can prevent wet sand from leaking during the conveying process and polluting the environment. The spiral column can precisely control the conveying amount of wet sand. In some embodiments, the surface of the spiral blades 1135 is coated with a tungsten carbide wear-resistant layer to increase the wear resistance of the spiral blades and improve the service life of the equipment. In some embodiments, the diameter of the tube body 1131 may be 300-600 mm. In some embodiments, the tilt angle of the spiral blades may be 5-45 degrees, preferably 10-40 degrees.
[0024] In some embodiments, the first conveying device 113 may further include a first driving device 114, which is connected to the auger column 1132 and can provide power to the auger column, thereby conveying wet sand. In some embodiments, the first driving device may be a first variable frequency motor, which can control the rotational speed of the auger column by controlling the frequency of the motor, thereby controlling the amount of wet sand conveyed and preventing wet sand from clogging the discharge port. In some embodiments, the power of the first variable frequency motor may be 22-37 kW, and the rotational speed of the first variable frequency motor may be 80-200 rpm, preferably 120-150 rpm.
[0025] Combination Figure 1B In some embodiments, a sealing device 1136 may be included between the spiral column 1132 and the tube body 1131. This sealing device can seal the wet sand transport space within the tube body, preventing moisture in the wet sand from flowing into the drive unit or other parts and affecting the normal operation of the equipment. In some embodiments, the sealing device may be a sealing ring, disposed between the bearing and the tube body. In some embodiments, a drainage groove 1137 may be included between the tube body 1131 and the sealing device 1136, which can be used to guide moisture in the wet sand out of the tube body.
[0026] In some embodiments, the sand collection bin 110 may further include a first air cannon 115, which is disposed on the second plane 1113 and located near the bottom 1114 of the bin. In some embodiments, the outlet of the first air cannon 115 faces the bottom of the bin, and compressed air can be introduced into the sand collection bin at certain intervals to prevent wet sand from arching in the sand collection bin and affecting the conveying of wet sand by the first conveying device. In some embodiments, the interval time may be 30S, 60S, 100S, 180S, 5min, 10min or more. In some embodiments, the sand collection bin 110 may further include an arch breaker 116, which is disposed between the first plane 1112 and the second plane 1113 and can cooperate with the first air cannon to prevent wet sand from arching in the sand collection bin.
[0027] Combination Figure 3 , Figure 3 This is a schematic diagram of a conveying system according to an embodiment of this application. In some embodiments, the conveying system 120 includes a second conveying device 121 and a third conveying device 122, wherein the second conveying device 121 and the third conveying device 122 are arranged vertically to a horizontal plane, and the height of the third conveying device 122 is higher than the height of the second conveying device 121, so as to reduce the floor space occupied by the sand adding device. In some embodiments, the second conveying device 121 may be inclined. In some embodiments, the second conveying device 121 and the third conveying device 122 may be screw conveyors.
[0028] In some embodiments, the second conveying device 121 may include a tube body 1211 and a spiral column 1212 disposed within the tube body. The tube body 1211 may include an inlet 1213 and an outlet 1214, which are disposed on the tube wall and respectively close to both ends of the tube body. The spiral column 1212 is provided with a plurality of spiral blades 1215, which can rotate within the tube body 1211 to lift the wet sand input at the inlet to the outlet. The tube body 1211 can prevent the wet sand from leaking during the conveying process and polluting the environment. The spiral column can precisely control the conveying amount of wet sand. In some embodiments, the surface of the spiral blades 1215 is coated with a tungsten carbide wear-resistant layer to increase the wear resistance of the spiral blades and improve the service life of the equipment. In some embodiments, the diameter of the tube body 1211 may be 350-550 mm. In some embodiments, the tilt angle of the spiral blades may be 10-35 degrees, preferably 10-20 degrees.
[0029] In some embodiments, the second conveying device 121 may further include a second driving device 123, which is connected to the auger column 1212 and can provide power to the auger column, thereby conveying wet sand. In some embodiments, the second driving device may be a second variable frequency motor, which can control the rotational speed of the auger column by controlling the frequency of the motor, thereby controlling the amount of wet sand conveyed and preventing wet sand from clogging the discharge port. In some embodiments, the power of the second variable frequency motor may be 15-75 kW, and the rotational speed of the second variable frequency motor may be 180-350 rpm, preferably 250-280 rpm.
[0030] In some embodiments, the second transmission device is also equipped with a sealing device and a drainage channel to seal the wet sand transmission space in the pipe and guide the moisture out of the pipe, preventing moisture in the wet sand from flowing into other parts and affecting the normal use of the equipment. Its configuration is similar to that of the first transmission device, and therefore will not be described in detail here.
[0031] In some embodiments, the third conveying device 122 may include a pipe body 1221 and a spiral column 1222 disposed within the pipe body. The pipe body 1221 may include an inlet and an outlet, which are disposed on the pipe wall and respectively close to both ends of the pipe body. The spiral column 1222 is provided with a plurality of spiral blades 1225, which can rotate within the pipe body 1221 to lift the wet sand input at the inlet to the outlet. The pipe body 1221 can prevent the wet sand from leaking during the conveying process and polluting the environment. The spiral column can precisely control the conveying amount of wet sand. In some embodiments, the surface of the spiral blades 1225 is coated with a tungsten carbide wear-resistant layer to increase the wear resistance of the spiral blades and improve the service life of the equipment. In some embodiments, the diameter of the pipe body 1221 may be 350-550 mm. In some embodiments, the tilt angle of the spiral blades may be 10-35 degrees, preferably 10-20 degrees.
[0032] In some embodiments, the third conveying device 122 may further include a third driving device 124, which is connected to the auger column 1222 and can provide power to the auger column, thereby conveying wet sand. In some embodiments, the second driving device may be a third variable frequency motor, which can control the rotational speed of the auger column by controlling the frequency of the motor, thereby controlling the amount of wet sand conveyed and preventing wet sand from clogging the discharge port. In some embodiments, the power of the third variable frequency motor may be 15-75 kW, and the rotational speed of the second variable frequency motor may be 180-350 rpm, preferably 250-280 rpm.
[0033] In some embodiments, the third transmission device is also equipped with a sealing device and a drainage channel to seal the wet sand transmission space in the pipe and guide the moisture to the outside of the pipe, preventing moisture in the wet sand from flowing into other parts and affecting the normal use of the equipment. Its configuration is similar to that of the first transmission device, so it will not be described in detail here.
[0034] In some embodiments, the second conveying device 121 and the third conveying device 122 may further include a discharge pipe 125, which can be configured to convey wet sand at the discharge port. In some embodiments, the discharge pipe 125 may be inclinedly disposed between the second conveying device 121 and the third conveying device 122, and between the third conveying device 122 and the sand storage bin.
[0035] Combination Figure 4 , Figure 4 This is a schematic diagram of a sand storage silo structure according to an embodiment of this application. In some embodiments, the sand storage silo 130 may include a silo body 131, wherein the silo body 131 adopts an inverted conical design, with an inlet 1311 at its upper end connected to a conveying system for storing wet sand, and an outlet 1312 at its lower end for supplying the stored wet sand outward. In some embodiments, a polymer wear-resistant liner (not shown in the figure) is provided on the inner wall of the silo body 131, which can improve the wear resistance of the silo body 131 and extend its service life. In some embodiments, the surface of the wear-resistant liner is provided with micro-protruding turbulence patterns, which can be used to form a water film between the sand and the silo wall, reducing friction between the wet sand and the silo wall and increasing the fluidity of the wet sand. In some embodiments, the surface of the wear-resistant liner is smooth, and its material may be nylon, polytetrafluoroethylene, etc., thereby avoiding material residue and facilitating the cleaning and maintenance of the equipment.
[0036] In some embodiments, the sand storage silo 130 may further include a fourth conveying device 132, which may be disposed at the outlet of the silo body 131 and supply the wet sand in the silo body to the outside in a metered manner. In some embodiments, the fourth conveying device 132 may be a screw conveyor. In some embodiments, the fourth conveying device 132 may include a pipe body 1321 and a screw column 1322 disposed in the pipe body. The pipe body 1321 may include an inlet and an outlet, which are disposed on the pipe wall and respectively close to both ends of the pipe body. The screw column 1322 is provided with a plurality of screw blades 1325, which can rotate in the pipe body 1321 and lift the wet sand input at the inlet to the outlet. The pipe body 1321 can prevent the wet sand from leaking during the conveying process and polluting the environment. The conveying amount of wet sand can be precisely controlled by the screw column. In some embodiments, the surface of the screw blades 1325 is coated with a tungsten carbide wear-resistant layer to increase the wear resistance of the screw blades and improve the service life of the equipment. In some embodiments, the diameter of the pipe body 1321 may be 300-600 mm. In some embodiments, the tilt angle of the helical blades can be 5-45 degrees, preferably 10-40 degrees.
[0037] In some embodiments, the fourth conveying device 132 may further include a fourth driving device 134, which is connected to the auger column 1322 and can provide power to the auger column, thereby conveying wet sand. In some embodiments, the second driving device may be a third variable frequency motor, which can control the rotational speed of the auger column by controlling the frequency of the motor, thereby controlling the amount of wet sand conveyed and preventing wet sand from clogging the discharge port. In some embodiments, the power of the third variable frequency motor may be 22-37 kW, and the rotational speed of the first variable frequency motor may be 80-200 rpm, preferably 120-150 rpm.
[0038] In some embodiments, the fourth transmission device is also equipped with a sealing device and a drainage channel to seal the wet sand transmission space in the pipe and guide the moisture out of the pipe, preventing moisture in the wet sand from flowing into other parts and affecting the normal use of the equipment. Its configuration is similar to that of the first transmission device, so it will not be described in detail here.
[0039] In some embodiments, the sand storage bin 130 may further include a second air cannon 133, which is disposed in the bin body 131 and close to the discharge port of the bin body. In some embodiments, the outlet of the second air cannon faces the bottom of the bin, and compressed air can be introduced into the sand storage bin at certain intervals to prevent wet sand from arching and clogging. In some embodiments, the interval time may be 30s, 60s, 90s, 120s, 180s, or 300s.
[0040] Figure 5 This is a block diagram of the control structure of a sand-adding device according to an embodiment of this application.
[0041] As shown in the figure, the control system 500 includes a controller 510, which can be used to control the conveying of wet sand from the sand collection bin to the sand storage bin. In some embodiments, the controller can be a PLC controller, which can realize the logic control, timing, counting, and sequential control functions of the sand adding device, and can also support analog quantity control, motion control, and communication networking functions, which can fully meet the control requirements of the sand adding device.
[0042] In some embodiments, the control system may further include one or more humidity sensors 520, which may be installed in the sand collection bin and / or sand storage bin, and may be used to collect parameters of the humidity of the wet sand, and may upload the collected parameters to the controller. In some embodiments, the controller may also precisely control the air cannon or drive device according to the collected parameters. For example, if the controller detects that a change in the moisture content of the wet sand in the sand collection bin corresponds to an increase in the viscosity of the wet sand, the controller controls the first air cannon to start, adjusts the interval of the compressed air input to the air cannon to prevent the wet sand from arching and affecting subsequent conveying, and controls the rotational speed of the first drive device to increase. In some embodiments, when the viscosity of the wet sand changes, the controller may adjust the pressure of the compressed air input to the air cannon. For example, when the viscosity increases, the controller may adjust the pressure of the compressed air input to the air cannon to increase.
[0043] In some embodiments, the control system may further include one or more material level detection devices 530, which may be installed in the sand collection bin and / or sand storage bin, and can detect the amount of material in the bin and upload the detection data to the controller. In some embodiments, the controller may, based on the detection results of the material level detection devices, and in conjunction with the humidity sensor 520, control the air cannon and / or the drive device. For example, when the amount of material in the sand storage bin increases and the humidity changes, the interval time or the input pressure of the compressed air input to the air cannon may be adjusted.
[0044] In some embodiments, the control system may further include one or more discharge detection devices 540, which may be installed at the discharge port of the transmission device, the outlet of the sand collection bin, or the outlet of the sand storage bin. These devices can detect whether the discharge is normal and upload the detection data to the controller. In some embodiments, the controller can control the air cannon and / or drive device based on the detection results of the discharge detection devices. In some embodiments, when an abnormal discharge is detected, the controller controls the drive device to stop rotating and issues an alarm. After receiving the alarm information, on-site personnel can manually adjust the equipment. For example, the personnel can adjust the speed of the drive device or adjust the input interval of the air cannon. In some embodiments, the controller can issue an alarm via light or sound. For example, a light or speaker can be installed on the sand adding device, and the light can be flashed or an audible warning can be issued. In some embodiments, the controller can also send alarm information to personnel with adjustment authority via SMS or WeChat message.
[0045] In some embodiments, the controller can also control the air cannon and / or drive device by combining the detection results of the humidity sensor and the material level detection device. For example, when it is detected that the humidity of the material in the sand storage bin is not changing, the material quantity is increasing, and no material is being discharged, the air cannon is controlled to shut down and the drive device stops rotating.
[0046] In some embodiments, the control system may further include a first drive module 551, a second drive module 552, a third drive module 553, and a fourth drive module 554, which can be used to connect the controller 510 to the first drive device, the second drive device, the third drive device, and the fourth drive device, respectively, and to transmit control commands from the controller to the drive devices. In some embodiments, the first drive module 551, the second drive module 552, the third drive module 553, and the fourth drive module 554 can also detect changes in the current of the drive devices and upload the detection results to the controller. In some embodiments, the controller can control the drive devices based on the current detection results. For example, when the first drive module detects an increase in the current of the first drive device, it can control the first drive device to decrease its rotation speed and increase the rotation speed of the second drive device.
[0047] In some embodiments, the control system may further include a first adjustment module 561 and a second adjustment module 562, which can be used to connect the controller 510 to the first air cannon and the second air cannon respectively, and can transmit the control commands of the controller to the air cannon to control the air cannon.
[0048] According to one embodiment of this application, in a simulated shale gas field fracturing operation, the sand feeding device of this application is used to transport 70 / 140 mesh quartz sand with a moisture content of 12%. The rotation speed of the first transmission device's auger is set to 100 rpm, the rotation speed of the second transmission device's auger is set to 280 rpm, and the rotation speed of the fourth transmission device's auger is set to 120 rpm. During 60 hours of continuous operation of the entire set of equipment, the sand feeding rate is stable at 3.5 ± 0.1 tons / minute, with no pipe blockage and minimal wear on the main pipeline.
[0049] The sand-adding device of this application, through the coordinated action of an air cannon and a controller, can effectively handle wet sand with a moisture content as high as 15%, effectively solving the technical problem of easy clogging in traditional equipment. Furthermore, the sand-adding device of this application, through the design of a screw conveyor and the control of the controller, can ensure that the sand-adding rate is stable within ±3% of the set value, allowing for precise quantitative supply. Parts of the sand-adding device of this application are made of composite wear-resistant materials, increasing the service life of the equipment by more than three times. Moreover, through modular design and smooth treatment of the inner wall of the chamber, the equipment cleaning time can be reduced by 60%, facilitating cleaning and maintenance. In addition, the sand-adding device of this application is applicable to various fracturing proppants such as quartz sand, ceramsite, and coated sand, meeting the mining needs of different geological conditions.
[0050] The above embodiments are for illustrative purposes only and are not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the scope of the invention. Therefore, all equivalent technical solutions should also fall within the scope of the invention.
Claims
1. A sand-adding device for wet sand used in fracturing, comprising: A sand collection bin includes a first bin body, a discharge platform connected to the first bin body, and a first conveying device. The first conveying device is arranged parallel to the horizontal plane at the bottom of the first bin body. The first silo includes an opening, and the unloading truck pours wet sand into the opening of the first silo from the unloading platform, and then transports it to the first discharge port of the first silo through the first conveying device. The conveying system includes a second conveying device and a third conveying device, which are arranged perpendicular to the horizontal plane. The third conveying device is arranged at a height higher than the second conveying device. The second conveying device is connected to the first discharge port of the first silo, and the third conveying device is connected to the second conveying device. A sand storage bin includes a second bin body and a fourth conveying device, wherein the second bin body is connected to a third conveying device, and the fourth conveying device is located at the second discharge port of the second bin body; The first air cannon and the second air cannon are respectively installed near the bottom of the first chamber and the second chamber. The outlets of the first air cannon and the second air cannon face the bottom of the first chamber and the second chamber, and input compressed air into the first chamber and the second chamber.
2. The sand adding device according to claim 1, wherein the first transmission device, the second transmission device, the third transmission device and the fourth transmission device are screw conveyors; the screw conveyor includes a tube body and a screw column disposed in the tube body, and a plurality of rotating blades are disposed on the screw column; wherein the diameter of the tube body is 300-600 mm; and the inclination angle of the rotating blades is 5-45 degrees.
3. The sand-adding device according to claim 2, wherein, The surface of the rotating blades is coated with a tungsten carbide wear-resistant layer.
4. The sand-adding device according to claim 2, wherein the spiral conveyor includes a driving device; wherein the driving device is a variable frequency motor, the power of the variable frequency motor is 15-75kw, and it provides a speed of 80-350rpm.
5. The sand-adding device according to claim 2, wherein a sealing layer is included between the pipe body and the spiral column, and a guide groove is included between the pipe body and the sealing layer for guiding water from the pipe body to the outside of the pipe body.
6. The sand-adding device according to claim 1, wherein, The inner wall of the second compartment is lined with a high-polymer wear-resistant lining plate, and the surface of the lining plate is decorated with micro-raised turbulence patterns.
7. The sand-adding device according to claim 1, further comprising a controller for controlling the first transmission device, the second transmission device, the third transmission device, the fourth transmission device, the first air cannon, and the second air cannon.
8. The sand-adding device according to claim 7, further comprising: One or more humidity sensors are installed in the first compartment and / or the second compartment to collect humidity parameters of the wet sand and upload the collected parameters to the controller.
9. The sand-adding device according to claim 7, further comprising: The material level detection device is installed in the second compartment and is used to detect the amount of wet sand in the second compartment and upload the detection results to the controller.
10. The sand-adding device according to claim 7, further comprising: The discharge detection device is located at the second discharge port and is used to detect the discharge status and upload the detection results to the controller.