Precise pressure discharging car for transporting and proportioning hydraulic fracturing polyacrylamide fine powder

Abstract

The invention relates to a precise pressure discharging car for transporting and batching hydraulic fracturing polyacrylamide fine powder, which comprises a car head, a car body, two pressure containers, a pressurizing system and a metering screw device, the pressurizing system is respectively connected with the upper ends of the pressure containers through pressurizing pipelines, the side edges of the middle parts of the two pressure containers are communicated through an outward opening type gate, and the metering screw device is connected with the two pressure containers. The lower portions of every two adjacent pressure containers are of inverted-cone structures, the lower ends of the inverted-cone structures are connected with metering screw devices, the metering screw devices are connected with a water-powder mixing head arranged on the vehicle body, one end of the water-powder mixing head is connected with water supply, the middle of the water-powder mixing head is connected with the metering screw devices, and the other end of the water-powder mixing head is connected with a sand mixer. The metering screw device is adopted to realize integrated, accurate and controllable batching, a polyacrylamide solution is efficiently conveyed to the sand mixer through the water-powder mixing head, the inconsistency phenomenon is eliminated, waste is reduced to the maximum extent, and the hydraulic fracturing polyacrylamide fine powder conveying and batching device can be used for hydraulic fracturing polyacrylamide fine powder conveying and batching and gives consideration to efficient conveying, high-quality, high-precision and safe batching operation.

Description

Technical Field

[0001] The present invention relates to a discharging vehicle, specifically a precision pressure discharging vehicle for transporting and proportioning fine polyacrylamide powder for hydraulic fracturing. Background Art

[0002] Existing fine polyacrylamide powder is transported and delivered in bags. This transportation and delivery method has limitations. Loading, unloading, and manual proportioning are time-consuming and laborious, and it can no longer be applied efficiently and at low cost. As a result, it is extremely easy to cause inaccurate proportioning of polyacrylamide powder. Manual or gravity systems will result in inconsistent measurement of fine powder due to changes in the density of the fine powder, affecting the accuracy and effectiveness of the fracturing proportioning operation. At the same time, there is moisture ingress and dust flying in the bagged powder proportioning, affecting the quality and use safety of the fracturing proportioning product. Summary of the Invention

[0003] The present invention provides a precision pressure discharging vehicle for transporting and proportioning fine polyacrylamide powder for hydraulic fracturing, which has a simple structure and can effectively balance high-efficiency transportation and high-quality, high-precision, and safe proportioning operations.

[0004] The technical solution adopted by the present invention is: a precision pressure discharging vehicle for transporting and proportioning fine polyacrylamide powder for hydraulic fracturing, including a vehicle head and a vehicle body. Two or more pressure vessels are arranged on the vehicle body. It is characterized in that: it further includes a pressurizing system, a metering screw device, and a water-powder mixing head arranged on the vehicle body. The pressurizing system is respectively connected to the upper ends of two or more pressure vessels through two or more pressurizing pipelines. The upper part and / or middle part and / or lower-middle part sides of adjacent two pressure vessels are connected through an outward-opening gate. The lower parts of adjacent two pressure vessels are of an inverted conical structure. The lower end of the inverted conical structure is connected to the metering screw device. The metering screw device is connected to the water-powder mixing head arranged on the vehicle body. One end of the water-powder mixing head is connected to water supply, the middle part is connected to the metering screw device, and the other end for feeding is connected to a sand mixer.

[0005] Further, a feeding port and a pressurizing port are arranged on the upper part of the pressure vessel, and a feeding cover is arranged on the feeding port.

[0006] Further, the outward-opening gate is an upward-opening or side-opening type.

[0007] Further, the pressurizing system includes a booster pump, a dryer, an air buffer tank, an intake check valve, an intake solenoid valve, and an intake flowmeter arranged in sequence on the pressurizing pipeline.

[0008] Further, an exhaust pipeline is also included. The exhaust pipeline is connected to the exhaust port at the upper end of the pressure vessel, and an exhaust check valve, a dust collector, and an exhaust solenoid valve are arranged in sequence on the exhaust pipeline.

[0009] Further, a vibration device is arranged on the outer side of the pressure vessel.

[0010] Further, the rapping device is arranged on the upper part and / or the upper middle part and / or the middle part and / or the lower middle part and / or the lower side wall of the pressure vessel.

[0011] Further, the rapping device is a rapping motor.

[0012] Further, the metering screw device includes a variable-frequency explosion-proof motor, a speed reducer, a conveying housing, and a metering screw. The metering screw is passed through the conveying housing, and both ends of the metering screw are respectively passed through and connected to the bearing mounting seats at both ends of the conveying housing. One end of the metering screw passes through the bearing mounting seat and is connected to the variable-frequency explosion-proof motor through the speed reducer. One upper end of the conveying housing is connected to the lower end of the pressure vessel, and a conveying outlet is opened at the lower part of the other end of the conveying housing.

[0013] Further, the conveying housing is connected to the lower end of the pressure vessel through an adjustable blanking device, and the adjustable blanking device is a butterfly valve or adopts a louvered grate structure.

[0014] Further, the water-powder mixing head includes a mixing pipe, a water inlet pipe, a powder inlet pipe, and a delivery pipe. An axial access cavity is arranged in the mixing pipe. One end of the access cavity is set as a mixing cavity with a reduced inner diameter. The delivery pipe is connected to the outside of the mixing cavity. The middle part of the mixing pipe is provided with a water inlet pipe for external water supply and communicating with the access cavity. The powder inlet pipe is connected from the other end of the mixing pipe into the reduced-inner-diameter section of the mixing cavity.

[0015] Further, a positioning plate is sleeved on the powder inlet pipe. A plurality of positioning bolts are uniformly passed through the positioning plate. The positioning bolts pass through the inner end of the positioning plate and are locked and connected to the other end of the mixing pipe. The positioning bolts are pressed against the positioning plate through lock nuts on the outer side of the positioning plate.

[0016] Adopting the above technical solutions, the beneficial effects of the present invention are as follows: 1. The metering screw device is adopted to realize integrated, accurate, and controllable batching. The metering screw can ensure accurate measurement and conveying of polyacrylamide fine powder, eliminate inconsistencies, and minimize waste.

[0017] 2. A closed-loop pressurization system is adopted. The closed design can prevent operators from contacting potentially harmful fine particles and prevent moisture from entering, thereby improving safety and product integrity. The polyacrylamide fine powder is transported and pressed into the metering screw device by pressurizing the pressure vessel; when the powder batching storage in any one pressure vessel is relatively low and the storage in another pressure vessel is relatively high, the external opening gate between the two can be opened, and the material in the pressure vessel with more stored material is sent into the pressure vessel with less stored material by its own weight or pressurization to meet the feeding use requirements of the pressure vessel with a large batching demand.

[0018] 3. The pressure vessel is also connected to an exhaust pipe. Periodically, after passing through the intake flowmeter, the pressurized air is heated by an electric heater on the pressurizing pipe and then sent into the pressure vessel. After drying the interior and then discharging, it can prevent moisture from entering during long-term storage or transportation, which may affect the powder properties.

[0019] 4. The feeding metering screw device at the lower end of the pressure vessel adopts a butterfly valve or a shutter grate structure, which can adjust the opening according to the demand. Combining with the vibration device arranged outside the pressure vessel, it can ensure stable and adjustable feeding while taking into account the conveying and metering requirements of the metering screw device.

[0020] 5. The water-powder mixing head is used to supply water-powder mixture to the sand mixer. Water is pumped into the access cavity through the water inlet pipe. Combining with the powder inlet pipe, polyacrylamide fine powder is sent into the mixing cavity. After mixing water and powder in the mixing cavity, it is sent out at high pressure and increased speed through the mixing cavity with a reduced inner diameter. It can meet the requirements of rapid and efficient mixing, directly introduce the powder into the subsequent mixing process, without the need for other electrical, power, valve, and flow equipment. Its structure is simple, the failure rate is low, it is stable and reliable in use, convenient for installation and use under the vehicle body, and at the same time reduces the fracturing operation costs such as the complexity of on-site equipment and the occupation of a large amount of site space.

[0021] This unloader is convenient, efficient for storage and transportation. The truck does not require a separate storage container, reducing the overall floor area and simplifying the delivery and usage processes. The unloader can efficiently feed multiple sand mixers with one truck, thus optimizing the resource utilization rate and shortening the operation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the present invention; Figure 2 It is a schematic structural diagram of the metering screw device of the present invention; Figure 3 It is Figure 1 a schematic structural diagram of the water-powder mixing head in the water.

[0023] In the figure: the truck head 1, the vehicle body 2, the pressure vessel 3, the feeding port 4, the pressurizing port 5, the pressurizing pipe 6, the booster pump 7, the dryer 8, the air buffer tank 9, the intake check valve 10, the intake solenoid valve 11, the intake flowmeter 12, the exhaust port 13, the exhaust pipe 14, the exhaust check valve 15, the dust collector 16, the exhaust solenoid valve 17, the outward-opening gate 18, the vibration device 19, the shutter grate structure 20, the variable-frequency explosion-proof motor 21, the speed reducer 22, the conveying housing 23, the bearing mounting seat 24, the metering screw 25, the conveying outlet 26, the water-powder mixing head 27, the mixing pipe 28, the access cavity 29, the mixing cavity 30, the water inlet pipe 31, the powder inlet pipe 32, the delivery pipe 33, the positioning plate 34, the positioning bolt 35, the locking nut 36. DETAILED DESCRIPTION OF THE INVENTION

[0024] The following is further described with reference to the accompanying drawings.

[0025] Figure 1 , 2 , 3 shown: A precision pressure unloading vehicle for transporting and batching polyacrylamide fine powder for hydraulic fracturing, comprising a vehicle head 1, a vehicle body 2, a pressure vessel 3, a pressurized pipeline 6, a booster pump 7, a dryer 8, an air buffer tank 9, an air intake check valve 10, an air intake solenoid valve 11, an air intake flow meter 12, an exhaust pipeline 14, an exhaust check valve 15, a dust collector 16, an exhaust solenoid valve 17, an outward-opening gate 18, a vibrating device 19, a louver grate structure 20, a variable frequency explosion-proof motor 21, a reducer 22, a conveying shell 23, a bearing mounting seat 24, a metering screw 25, a conveying outlet 26 and a water-powder mixing head 27.

[0026] The front of the vehicle 1 is connected to the vehicle body 2, on which two pressure vessels 3, a booster pump 7, a dryer 8, an air buffer tank 9, and a dust collector 16 are arranged. A rapping device 19 is arranged on the outer side of the pressure vessel 3. A feeding port 4, a pressurizing port 5 and an exhaust port 13 are arranged on the upper part of the pressure vessel 3. A feeding cover is arranged on the feeding port. The middle and lower sides of the two pressure vessels 3 are connected through an outward-opening gate 18. The lower part of the two pressure vessels 3 is an inverted cone structure. The lower end of the inverted cone structure is connected to a metering screw device, and the metering screw device is connected to a water-powder mixing head 27 arranged on the vehicle body. The pressurizing port 5 is connected to the pressurizing pipe 6, on which a booster pump 7, a dryer 8, an air buffer tank 9, an air intake check valve 10, an air intake solenoid valve 11 and an air intake flow meter 12 are sequentially arranged; the exhaust port 13 is externally connected to an exhaust pipe 14, on which an exhaust check valve 15, a dust collector 16 and an exhaust solenoid valve 17 are sequentially arranged; in this embodiment, the exhaust pipes 14 of the two pressure vessels are connected to a dust collector for use.

[0027] like Figure 2 In the embodiment, the metering screw device includes a variable frequency explosion-proof motor 21, a reducer 22, a conveying shell 23, a bearing mounting seat 24, a metering screw 25, and a conveying outlet 26. The metering screw 25 is connected in the conveying shell 23, and the two ends of the metering screw 25 are respectively connected to the bearing mounting seats 24 at the two ends of the conveying shell 23. One end of the metering screw 25 passes through the bearing mounting seat and is connected to the variable frequency explosion-proof motor 21 through the reducer 22. The upper part of one end of the conveying shell 23 is connected to the lower end of the pressure vessel 3 through the louver grate structure 20, and the lower part of the other end of the conveying shell 23 is provided with a conveying outlet 26.

[0028] like Figure 3In the figure, the water-powder mixing head 27 includes a mixing pipe 28, a water inlet pipe 31, a powder inlet pipe 32, a delivery pipe 33, a positioning plate 34, positioning bolts 35, and a locking nut 36. An axial access cavity 29 is provided inside the mixing pipe 28. One end of the access cavity 29 is provided with a mixing cavity 30 with a reduced inner diameter at the opening. The delivery pipe 33 is connected to the outside of the mixing cavity 30. The middle part of the mixing pipe 28 is provided with a water inlet pipe 31 for external water supply and communicating with the access cavity. The powder inlet pipe 32 is inserted into the reduced-inner-diameter section of the mixing cavity 30 from the other end of the mixing pipe 28. A positioning plate 34 is sleeved on the powder inlet pipe 32. A plurality of positioning bolts 35 are evenly inserted through the positioning plate 34. The positioning bolts 35 penetrate into the inner end of the positioning plate 34 and are locked to connect the other end of the mixing pipe. The positioning bolts 35 press the positioning plate 34 on the outer side of the positioning plate 34 through the locking nut 36. In this embodiment, the water-powder mixing head 27 is horizontally arranged axially. The mixing pipe 28 of the water-powder mixing head is hung or supported at the lower end of the vehicle body. The positioning plate 34 is connected to the vehicle body. By adjusting the positioning bolts 35, the length of the powder inlet pipe 32 extending into the reduced-inner-diameter section of the mixing cavity can be adjusted, so as to adjust the flow rate and speed of the water and powder mixed in the mixing cavity and sent out through the delivery pipe.

[0029] In this embodiment, only two pressure vessels are provided. According to requirements and the vehicle body structure, multiple pressure vessels that are connected in series or in pairs can also be provided to adapt to feeding multiple sand mixers.

[0030] In this embodiment, the position where the vibration device is installed can be at the upper part and / or the upper middle part and / or the middle part and / or the lower middle part and / or the lower side wall of the pressure vessel; the vibration device can adopt a vibration motor. This vibration feeding technology belongs to the prior art and will not be described in detail in this application.

[0031] On the basis of this embodiment, the conveying housing can be connected to the conveying housing 23 through a butterfly valve or a structure with similar on-off control to replace the louvered grate structure.

[0032] On the basis of this embodiment, the powder sent out by the metering screw device can be sent to the sand mixer through multiple series-connected water-powder mixing heads to meet the requirements of high-speed conveying and efficient and sufficient mixing.

Claims

1. A precision pressure unloading vehicle for transporting and proportioning polyacrylamide fine powder in hydraulic fracturing, comprising a vehicle head and a vehicle body, with more than two pressure vessels arranged on the vehicle body, characterized in that: It also includes a pressurizing system, a metering screw device and a water-powder mixing head arranged on the vehicle body. The pressurizing system is connected to the upper ends of more than two pressure vessels through more than two pressurizing pipes respectively, and the sides of the upper parts and / or middle parts and / or middle-lower parts of two adjacent pressure vessels are connected through an outward-opening gate. The lower parts of the two adjacent pressure vessels are inverted cone structures, and the lower ends of the inverted cone structures are connected to the metering screw device. The metering screw device is connected to the water-powder mixing head arranged on the vehicle body. One end of the water-powder mixing head is connected to water supply, the middle part is connected to the metering screw device, and the other end is connected to a sand mixer for feeding.

2. The precision pressure unloading vehicle for transporting and proportioning fine polyacrylamide powder used in hydraulic fracturing according to claim 1, wherein: A feeding port and a pressurizing port are arranged on the upper part of the pressure container, and a feeding cover is arranged on the feeding port.

3. The precision pressure discharging vehicle for transporting and proportioning fine polyacrylamide powder used in hydraulic fracturing according to claim 1, characterized in that: The outward-opening gate is upward-opening or side-opening.

4. The precision pressure discharging vehicle for transporting and proportioning polyacrylamide fine powder used in hydraulic fracturing, as claimed in claim 1, is characterized in that: The pressurizing system comprises a booster pump, a dryer, an air buffer tank, an air intake check valve, an air intake solenoid valve and an air intake flow meter which are sequentially arranged on the pressurizing pipeline.

5. The precision pressure unloading vehicle for transporting and proportioning fine polyacrylamide powder used in hydraulic fracturing, as claimed in claim 4, is characterized in that: It also includes an exhaust pipeline, which is connected to the exhaust port at the upper end of the pressure container. An exhaust one-way valve, a dust collector and an exhaust solenoid valve are arranged in sequence on the exhaust pipeline.

6. The precision pressure unloading vehicle for transporting and batching polyacrylamide fine powder used in hydraulic fracturing according to claim 1, wherein: A rapping device is arranged on the outer side of the pressure vessel.

7. The precision pressure unloading vehicle for transporting and proportioning polyacrylamide fine powder used in hydraulic fracturing according to claim 6, characterized in that: The rapping device is arranged on the upper part and / or the upper middle part and / or the middle part and / or the lower middle part and / or the lower side wall of the pressure vessel.

8. The precision pressure unloading vehicle for transporting and proportioning polyacrylamide fine powder used in hydraulic fracturing, as claimed in claim 7, is characterized in that: The rapping device is a rapping motor.

9. The precision pressure unloading vehicle for transporting and batching fine polyacrylamide powder for hydraulic fracturing according to claim 1, wherein: The metering screw device includes a variable frequency explosion-proof motor, a reducer, a conveying shell and a metering screw. The metering screw is connected inside the conveying shell. Both ends of the metering screw are respectively connected to the bearing mounting seats at both ends of the conveying shell. One end of the metering screw passes through the bearing mounting seat and is connected to the variable frequency explosion-proof motor via the reducer. The upper part of one end of the conveying shell is connected to the lower end of the pressure vessel, and a conveying outlet is opened at the lower part of the other end of the conveying shell.

10. The precision pressure unloading vehicle for transporting and proportioning polyacrylamide fine powder used in hydraulic fracturing according to claim 9, characterized in that: The conveying shell is connected to the lower end of the pressure container through an adjustable feeding device, and the adjustable feeding device is a butterfly valve, or a shutter grate structure is adopted.

11. The precision pressure unloading vehicle for transporting and batching polyacrylamide fine powder used in hydraulic fracturing according to claim 1, characterized in that: The water-powder mixing head comprises a mixing tube, a water inlet pipe, a powder inlet pipe and a delivery pipe. An axial access cavity is arranged in the mixing tube. One end of the access cavity is arranged as a mixing cavity with a narrowed inner diameter. The delivery pipe is connected to the outside of the mixing cavity. A water inlet pipe connected to the access cavity and connected to the external water supply is arranged in the middle of the mixing tube. The powder inlet pipe is connected to the narrowed inner diameter section of the mixing cavity from the other end of the mixing tube.

12. The precision pressure unloading vehicle for transporting and proportioning fine polyacrylamide powder used in hydraulic fracturing according to claim 11, wherein: The powder inlet pipe is sleeved with a positioning plate, and a plurality of positioning bolts are evenly distributed on the positioning plate. The positioning bolts penetrate into the inner end of the positioning plate and are locked to connect the other end of the mixing pipe. The positioning bolts are pressed into the positioning plate through locking nuts on the outer side of the positioning plate.

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