Liquid adding device of fracturing system

Abstract

The utility model discloses a liquid adding device of a fracturing system. The device comprises a liquid additive tank and sand mixing equipment, a cam rotor pump and a mass flow meter are sequentially mounted between the liquid inlet end and the liquid outlet end of an additive conveying pipeline, and the cam rotor pump is driven by an integrated variable frequency motor; the mass flow meter is connected with the control system; the mass flow meter and the integrated variable frequency motor are connected with the control system, and the control system adjusts the flow and the flow speed of the liquid additive by controlling the integrated variable frequency motor. The liquid additive adding device has the advantages of being reasonable in structural design, capable of achieving uniform adding of liquid additives, capable of improving adding precision, small in size, easy and convenient to operate and the like. According to the device, the liquid additive can be accurately conveyed into a mixing tank of sand mixing equipment and is uniformly mixed with fracturing fluid; and a plurality of sets of adding devices can be arranged as required to convey different liquid additives so as to meet the technological requirements of fracturing operation.

Description

Technical Field

[0001] The utility model relates to a fracturing system, in particular to a liquid adding device for the fracturing system, and belongs to the technical field of oil and gas development. Background Art

[0002] In the fracturing operation of oil field development, liquid additives need to be added to the fracturing fluid of the sand mixing equipment to change the physical or chemical properties of the fracturing fluid and meet specific fracturing process requirements. Existing liquid additives are usually added manually or by simple mechanical delivery methods, such as hydraulic pumps, ordinary motors, reduction boxes, etc., so there are problems such as uneven addition, low addition accuracy, large area occupied by the addition device, and inconvenient maintenance. Utility Model Content

[0003] In order to overcome the shortcomings of uneven addition, low addition accuracy, large floor space and inconvenient maintenance of liquid additives in existing fracturing operations by manual addition or simple mechanical conveying equipment, the utility model provides a liquid addition device for a fracturing system.

[0004] The technical solution adopted by the utility model to solve the technical problem is: a liquid adding device for a fracturing system, including a liquid additive tank and a sand mixing device, a cam rotor pump and a mass flow meter are installed in sequence between the liquid inlet end and the liquid outlet end of the additive delivery pipeline, and the cam rotor pump is driven by an integrated variable frequency motor; the mass flow meter is connected to the control system.

[0005] The mass flow meter and the integrated variable frequency motor are connected to a control system, and the control system adjusts the flow rate and flow velocity of the liquid additive by controlling the operation of the integrated variable frequency motor.

[0006] The liquid inlet end of the delivery pipeline is connected to the outlet pipeline of the liquid additive tank through a quick-release joint; the liquid outlet end of the delivery pipeline is connected to the sand mixing equipment of the fracturing system through a quick-release joint.

[0007] The cam rotor pump, the integrated variable frequency motor, the mass flow meter and the conveying pipeline are arranged on the skid seat.

[0008] The skid is provided with more than two sets of adding devices for respectively conveying different kinds of liquid additives.

[0009] A ball valve is installed between the mass flow meter and the liquid outlet of the delivery pipeline.

[0010] The beneficial effects of the utility model are that the structure design is reasonable, the uniform addition of liquid additives can be achieved, and the addition accuracy is improved, and at the same time it has the characteristics of small size and easy operation; the device can accurately deliver the liquid additive to the mixing tank of the sand mixing equipment and mix it evenly with the fracturing fluid; multiple sets of adding devices can be set as needed to deliver different liquid additives to meet the requirements of the fracturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of a liquid adding device for a fracturing system of the utility model.

[0012] Figure 2 yes Figure 1 Top view of the .

[0013] In the figure: 1. Skid seat, 2. Lifting lug, 3. Liquid inlet, 4. Integrated variable frequency motor, 5. Cam rotor pump, 6. Union, 7. Delivery pipeline, 8. Mass flow meter, 9. Ball valve, 10. Liquid outlet, 11. Control system. DETAILED DESCRIPTION

[0014] The present invention is further described below in conjunction with the accompanying drawings and embodiments. However, those skilled in the art should be aware that the present invention is not limited to the specific implementations listed, and any implementations that conform to the spirit of the present invention should be included in the protection scope of the present invention.

[0015] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "left", "right", "horizontal", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing or simplifying the description of the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0016] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connection", and "seal" should be understood in a broad sense. For example, the connection can be a fixed connection or a detachable connection, a direct connection, an indirect connection, or an integral connection; it can be a mechanical connection, an indirect connection through an intermediate medium, or a communication between the two components. The seal can be an oil seal, a packing seal, or other forms of seals. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0017] See attached Figure 1The utility model discloses a liquid adding device for a fracturing system, comprising a liquid additive tank and a sand mixing device. A cam rotor pump 5 and a mass flow meter 8 are sequentially installed between the liquid inlet end 3 and the liquid outlet end 10 of the additive delivery pipeline 7. The cam rotor pump 5 is driven by an integrated variable frequency motor 4; the mass flow meter 8 is connected to a control system 11.

[0018] The mass flow meter 8 and the integrated variable frequency motor 4 are connected to a control system 11 , and the control system 11 adjusts the flow rate and flow velocity of the liquid additive by controlling the operation of the integrated variable frequency motor 4 .

[0019] The liquid inlet end 3 of the delivery pipeline 7 is connected to the outlet pipeline of the liquid additive tank through a quick connector; the liquid outlet end 10 of the delivery pipeline 7 is connected to the sand mixing equipment of the fracturing system through a quick connector.

[0020] The cam rotor pump 5 , the integrated variable frequency motor 4 , the mass flow meter 8 , and the delivery pipeline 7 are arranged on the skid 1 .

[0021] Furthermore, the skid 1 is provided with more than two sets of adding devices for respectively conveying different types of liquid additives.

[0022] A ball valve 9 is installed between the mass flow meter 8 and the liquid outlet 10 of the delivery pipeline 7 .

[0023] The utility model provides a liquid adding device for a fracturing system, wherein:

[0024] The skid 1 is made of high-strength metal profiles with strong bearing capacity, and components such as the cam rotor pump 5, the integrated variable frequency motor 4, the mass flow meter 8, and the conveying pipeline 7 are fixedly installed on the skid 1. Furthermore, a lifting lug 2 is welded on the side of the skid 1 for lifting the skid to facilitate installation and transportation.

[0025] The liquid inlet end 3 and the liquid outlet end 10 are both provided with quick-release connectors, which facilitate quick connection with the outlet pipeline of the liquid additive tank and the sand mixing equipment of the fracturing system.

[0026] The cam rotor pump 5 is used to transport liquid additives for fracturing operations, making full use of the cam rotor pump's reliability, firmness, energy saving, self-priming, wear resistance and non-clogging characteristics to transport various viscous or particulate-containing liquid additives to ensure smooth operation of the addition device.

[0027] The integrated variable frequency motor 4 is used to drive the cam rotor pump 5. The power output of the integrated variable frequency motor 4 is accurately controlled by the control system. Compared with traditional hydraulic drive or ordinary motor drive, there is no need for a hydraulic motor and a hydraulic station, or an ordinary motor and a reducer, which reduces the number of equipment, saves space, and reduces energy consumption.

[0028] Furthermore, the delivery pipelines 7 can be connected via unions 6 to achieve rapid connection and disassembly of the pipelines.

[0029] The mass flow meter 8 measures the flow rate by measuring the mass of the substance. The measured flow rate is accurate and is not affected by temperature, pressure, density and viscosity. The mass flow meter 8 is connected to the control system 11 to transmit the flow signal of the liquid additive to the control system 11 in real time.

[0030] A ball valve 9 is installed on the delivery pipeline 7 to close the pipeline and prevent leakage of residual liquid.

[0031] The control system 11 includes sensors, controllers, displays, etc., which monitor the parameters such as the fracturing fluid flow, pressure and temperature of the fracturing equipment in real time, and adjust the amount and proportion of the liquid additive by controlling the integrated variable frequency motor 4 according to the fracturing process design requirements, thereby realizing intelligent control of the liquid adding device (the intelligent control content does not fall within the scope of protection of this application, and the applicant of this patent will apply for another case).

[0032] On the skid 1, multiple sets of adding devices can be arranged according to the fracturing process design to meet the addition requirements of various additives. Figure 2 As shown, four sets of adding devices are arranged on the skid 1. A spare adding device can also be arranged as required. During the fracturing operation, if there is a problem with the adding device, the spare device can be started to ensure the normal progress of the fracturing operation.

[0033] When using the liquid adding device of the fracturing system of the utility model, the liquid inlet end 3 is first connected to the matching liquid additive tank through a hose line, the liquid outlet 10 is connected to the sand mixing equipment through a pipeline, and the ball valve 9 is opened; the control system 11 is connected to the sand mixing equipment through a signal cable, and the sand mixing equipment and the adding device can be operated independently by switching, and the relationship is interlocked. According to the requirements of the fracturing process design, after setting the relevant fracturing operation parameters, the control system 11 starts the integrated variable frequency motor 4, drives the cam rotor pump 5 to operate, and the additive enters the cam rotor pump 5 through the liquid inlet end 3, and then flows through the mass flow meter 8 through the delivery pipeline 7, and finally discharged from the liquid outlet end 10 to the sand mixing equipment. Among them, the control system 11 automatically adjusts the addition amount and proportion parameters of the liquid additive by real-time monitoring of the flow, pressure and temperature of the fracturing fluid of the sand mixing equipment, and drives the integrated variable frequency motor 4 through the control system 11 to realize the precise control and adjustment of the liquid additive, thereby meeting the quality parameter requirements of the fracturing fluid of the oil field fracturing operation.

[0034] The fracturing system liquid adding device of the utility model is used in conjunction with the oilfield sand mixing equipment (but not limited to), which can realize the uniform addition of liquid additives and improve the addition accuracy; it adopts an integrated variable frequency motor, has the characteristics of small size, simple operation, convenient maintenance, etc. The utility model can evenly mix different types of liquid additives with the fracturing fluid at the same time according to the fracturing process requirements, thereby meeting the fracturing fluid parameter requirements of the oilfield fracturing operation.

[0035] It should be noted that the above-mentioned embodiments are examples rather than limitations of the present invention, and those skilled in the art will be able to design many alternative embodiments without departing from the scope of the claims of this patent.

Claims

1. A liquid adding device for a fracturing system, comprising a liquid additive tank and a sand mixing device, characterized in that: A cam rotor pump and a mass flow meter are sequentially installed between the liquid inlet and outlet ends of the additive delivery pipeline. The cam rotor pump is driven by an integrated variable frequency motor; and the mass flow meter is connected to the control system.

2. The fracturing system liquid adding device according to claim 1, characterized in that: The mass flow meter and the integrated variable frequency motor are connected to a control system, and the control system adjusts the flow rate and flow velocity of the liquid additive by controlling the operation of the integrated variable frequency motor.

3. The fracturing system liquid adding device according to claim 2, characterized in that: The liquid inlet end of the delivery pipeline is connected to the outlet pipeline of the liquid additive tank through a quick-release joint; the liquid outlet end of the delivery pipeline is connected to the sand mixing equipment of the fracturing system through a quick-release joint.

4. The fracturing system liquid adding device according to any one of claims 1 to 3, characterized in that: The cam rotor pump, the integrated variable frequency motor, the mass flow meter and the conveying pipeline are arranged on the skid seat.

5. The fracturing system liquid adding device according to claim 4, characterized in that: The skid is provided with more than two sets of adding devices for respectively conveying different kinds of liquid additives.

6. The fracturing system liquid adding device according to claim 5, characterized in that: A ball valve is installed between the mass flow meter and the liquid outlet of the delivery pipeline.

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