A high voltage power transmission system for a fracturing system

Abstract

This utility model discloses a high-voltage power transmission system for fracturing systems, including an AC power grid, a high-voltage switchgear, a high-voltage transmission network, a transformer, and a fracturing pump motor. The input end of the high-voltage switchgear is electrically connected to the AC power grid, and its output end is electrically connected to the input end of the transformer via the high-voltage transmission network. This switchgear distributes the voltage transmitted from the AC power grid to the transformer via the high-voltage transmission network. The output end of the transformer is electrically connected to the fracturing pump motor, and the transformer reduces the voltage transmitted from the high-voltage transmission network to drive the fracturing pump motor. This utility model directly transforms a 35kV voltage level to the voltage level required by the fracturing pump motor using a single transformer, achieving a single-stage power transmission mode. This eliminates the need for a separate 10kV voltage level to 6kV or 3.3kV power transmission link. The well site does not require a 10kV switchgear or a transformer for transforming the 10kV voltage level to 6kV or 3.3kV, thus reducing the number of devices, optimizing the well site layout, and shortening the load energizing time.

Description

Technical Field

[0001] This utility model relates to the field of electric fracturing construction technology in oil and gas fields. More specifically, this utility model relates to a high-voltage power transmission system for fracturing systems. Background Technology

[0002] In recent years, my country's oil fracturing equipment has been fully electrified, using electric motors to drive fracturing pumps. This has brought many benefits, such as high efficiency, energy saving, and environmental protection. However, motor operation requires a power transmission system for support. Currently, in existing fracturing systems using high-voltage power transmission systems, combined with auxiliary... Figure 1 As shown, the 35kV high-voltage AC power from the well site power transformer is typically transformed into 10kV AC power, and then the 10kV power is transformed into medium-voltage 6kV or 3kV AC power to transmit power to the fracturing equipment to drive the fracturing pump motor. The high-voltage transmission network between the front-end high-voltage switchgear and the fracturing equipment is mainly 6kV or 3.3kV. At the 6kV or 3.3kV voltage level, the current carrying capacity of the cables in the transmission circuit is large, requiring a large number of cables, and the labor intensity of on-site laying is relatively high. In addition, in the well site layout, there are many transmission levels and a large number of electrical devices between the high-voltage transmission system and the fracturing equipment, resulting in large power losses.

[0003] Therefore, there is an urgent need to provide a high-voltage power transmission system for fracturing systems to unify the voltage level of high-voltage power transmission systems at well sites, thereby optimizing the power transmission system structure of the entire fracturing system at the well site and simplifying the layout of electrical equipment at the well site. Summary of the Invention

[0004] Another objective of this invention is to provide a high-voltage power transmission system for fracturing systems that can unify the high-voltage power transmission level at well sites and simplify the layout of electrical equipment at well sites.

[0005] To achieve these objectives and other advantages according to this utility model, a high-voltage power transmission system for fracturing systems is provided, comprising an AC power grid, a high-voltage switchgear, a high-voltage transmission network, a transformer, and a fracturing pump motor. The input end of the high-voltage switchgear is electrically connected to the AC power grid, and its output end is electrically connected to the input end of the transformer via the high-voltage transmission network. The switchgear is used to distribute the voltage transmitted from the AC power grid to the transformer via the high-voltage transmission network. The output end of the transformer is electrically connected to the fracturing pump motor. The transformer is used to step down the voltage transmitted from the high-voltage transmission network and output it to drive the fracturing pump motor.

[0006] Preferably, the output terminal of the transformer is electrically connected to the fracturing pump motor via a frequency converter.

[0007] Preferably, a high-voltage switchgear is provided between the high-voltage switchgear and the high-voltage transmission network, the input terminal of the high-voltage switchgear is electrically connected to the output terminal of the high-voltage switchgear, and the output terminal of the high-voltage switchgear is electrically connected to the high-voltage transmission network.

[0008] Preferably, the transformer, the frequency converter, and the fracturing pump motor are integrated into one unit via the fracturing vehicle.

[0009] Preferably, multiple high-voltage switchgear, high-voltage transmission network and fracturing vehicle are provided, with one high-voltage switchgear corresponding to one high-voltage transmission network and one fracturing vehicle; the output terminal of the high-voltage switchgear is electrically connected to the input terminal of the high-voltage busbar, and the high-voltage busbar is provided with multiple output terminals, which are respectively electrically connected to the input terminals of multiple high-voltage switchgear.

[0010] Preferably, the circuit breakers in the multiple high-voltage switchgear are all controlled to open or close via a remote monitoring platform.

[0011] This utility model has at least the following beneficial effects:

[0012] 1. This utility model directly transforms the 35kV voltage level to the voltage level required for the fracturing pump motor through a single transformer, realizing a single-level substation mode. This reduces the substation link from 10kV voltage level to 6kV or 3.3kV, eliminating the need for 10kV switchgear and transformers for transforming 10kV voltage level to 6kV or 3.3kV voltage level at the well site. This reduces the number of devices, optimizes the well site layout, and shortens the load energizing time.

[0013] 2. This utility model integrates the transformer and frequency converter on the fracturing truck, realizing the integration of the load end of the high-voltage power transmission system for the fracturing system, further optimizing the well site layout. The entire well site only needs to lay a high-voltage power transmission network for transmitting 35kV voltage level, and the fracturing pump motor is directly powered through the high-voltage power transmission network. There is no need to lay cables for transmitting 6kV or 3.3kV voltage level at the well site, which unifies the power transmission level at the well site and greatly reduces the cable laying intensity at the well site.

[0014] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0015] Figure 1 A schematic diagram of a high-voltage power transmission system for fracturing systems implemented using existing technology;

[0016] Figure 2This is a schematic diagram of the high-voltage power transmission system for fracturing systems of this utility model, used to transmit 35kV voltage.

[0017] Figure 3 This is a schematic diagram of the high-voltage power transmission system for fracturing systems of this utility model, used to transmit 10kV voltage levels.

[0018] Figure 4 This is a structural block diagram of the high-voltage power transmission system for the fracturing system of this utility model;

[0019] Explanation of reference numerals on the accompanying drawings:

[0020] 1. 35kV switchgear, 2. 35kV / 10kV transformer, 3. 10kV switchgear, 4. Transformer, 5. Rectifier, 6. Inverter, 7. Fracturing pump motor, 1-1. High-voltage switchgear, 2-1. High-voltage busbar, 3-1. High-voltage switchgear, 4-1. High-voltage transmission network, 5-1. Transformer, 6-1. Frequency converter, 7-1. Fracturing pump motor, 8-1. Fracturing truck. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0022] It should be noted that in the description of this utility model, the terms "horizontal", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] The current high-voltage power transmission system used in fracturing systems is arranged in the following way at the well site: Figure 1As shown, during power transmission, the 35kV voltage level of the AC power grid, after being protected by the 35kV switch station 1, is first transformed into a 10kV voltage level by the 35kV / 10kV transformer 2, and then, after being protected by the 10kV switch station 3, is transformed into a 6kV or 3kV voltage level by the transformer 4, rectifier 5, and inverter 6. The 6kV or 3kV voltage level is then transmitted to the fracturing pump motor 7 via a cable laid at the well site to drive the fracturing pump motor 7. The current high-voltage power transmission system used in fracturing systems first transforms the 35kV voltage level... The two-stage substation mode, which involves converting the voltage to 10kV and then to 6kV or 3kV, requires the installation of multiple sets of high-voltage equipment at the well site. This results in a complex high-voltage transmission system structure, time-consuming well site layout, a large number of equipment, a large land area, long load energization time, and high power loss. Furthermore, the power transmission between the high-voltage transmission system and the fracturing pump motor 7 is mainly 6kV or 3.3kV. Due to the low voltage and high current in this part of the transmission line, a large number of cables are required, resulting in a high pressure on cable laying at the well site.

[0024] To address the problems of complex structure, large number of devices, and high pressure of cable laying in existing high-voltage power transmission systems used in fracturing systems, such as... Figure 2 , Figure 4 As shown, this utility model provides a high-voltage power transmission system for fracturing systems, including an AC power grid, a high-voltage switchgear 1-1, a high-voltage power transmission network 4-1, a transformer 5-1, and a fracturing pump motor 7-1. The input end of the high-voltage switchgear 1-1 is electrically connected to the AC power grid, and the output end is electrically connected to the input end of the transformer 5-1 through the high-voltage power transmission network 4-1. The switchgear 1-1 is used to distribute the voltage transmitted from the AC power grid to the transformer 5-1 through the high-voltage power transmission network 4-1. The output end of the transformer 5-1 is electrically connected to the fracturing pump motor 7-1. The transformer 5-1 is used to step down the voltage transmitted from the high-voltage power transmission network 4-1 and output it to drive the fracturing pump motor 7-1.

[0025] In the above technical solution, the high-voltage power transmission system for fracturing systems of this utility model includes an AC power grid, a high-voltage switchgear 1-1, a high-voltage transmission network 4-1, a transformer 5-1, and a fracturing pump motor 7-1. The AC power grid provides a voltage level of 35kV. After being protected by the high-voltage switchgear 1-1, the 35kV voltage is distributed to the transformer 5-1 through the high-voltage transmission network 4-1. The transformer 5-1 directly transforms the 35kV voltage level into a voltage level of 6kV or 3.3kV to drive the fracturing pump motor 7-1, thus realizing the operation of the fracturing pump motor 7-1. Transformer 5-1 directly converts the 35kV voltage level to the voltage level required by the fracturing pump motor 7-1 in a single-stage substation mode, reducing the need for a 10kV voltage level to 6kV or 3.3kV substation. This eliminates the need for equipment such as a 10kV switchgear 3 and a transformer 4 for converting the 10kV voltage level to 6kV or 3.3kV at the well site, reducing the number of devices, optimizing the well site layout, and shortening the load energizing time. Transformer 5-1 is a 24-pulse rectifier transformer, which can reduce the interference of harmonics from the fracturing equipment on the power grid.

[0026] In another technical solution, the output terminal of the transformer 5-1 is electrically connected to the fracturing pump motor 7-1 through the frequency converter 6-1.

[0027] In this technical solution, the output terminal of transformer 5-1 is electrically connected to the input terminal of frequency converter 6-1, and the output terminal of frequency converter 6-1 is electrically connected to fracturing pump motor 7-1. By setting frequency converter 6-1 between transformer 5-1 and fracturing pump motor 7-1, the fracturing pump motor 7-1 can gradually accelerate to the set speed with a lower voltage and frequency, avoiding equipment damage caused by the large current surge generated directly during the start-up of fracturing pump motor 7-1, and extending the service life of the equipment.

[0028] In another technical solution, a high-voltage switchgear 3-1 is provided between the high-voltage switchgear 1-1 and the high-voltage transmission network 4-1. The input terminal of the high-voltage switchgear 3-1 is electrically connected to the output terminal of the high-voltage switchgear 1-1, and the output terminal of the high-voltage switchgear 3-1 is electrically connected to the high-voltage transmission network 4-1.

[0029] In this technical solution, the high-voltage switchgear 3-1 is used to provide power and electrical protection for the high-voltage transmission network 4-1, transformer 5-1, frequency converter 6-1, and fracturing pump motor 7-1, ensuring the safety of the transmission circuit.

[0030] In another technical solution, the transformer 5-1, the frequency converter 6-1, and the fracturing pump motor 7-1 are integrated into one unit via the fracturing truck 8-1.

[0031] In this technical solution, by integrating transformer 5-1 and frequency converter 6-1 onto the fracturing truck 8-1, the load end of the high-voltage power transmission system for the fracturing system is integrated, further optimizing the well site layout. The entire well site only needs to lay a high-voltage power transmission network 4-1 for transmitting 35kV voltage level, which directly supplies power to the fracturing pump motor 7-1. There is no need to lay cables for transmitting 6kV or 3.3kV voltage levels at the well site, unifying the power transmission level of the well site. Under the same load power, using the 35kV high-voltage power transmission network 4-1 as the power supply for the fracturing pump is more efficient. The fracturing pump motor 7-1 transmits power with high voltage and low current, requiring less cable and significantly reducing the intensity of cable laying at the well site. The fracturing truck 8-1 facilitates rapid relocation and energy saving of the high-voltage power transmission system. After arriving at the well site, the fracturing truck 8-1 only needs to connect to the high-voltage power transmission network 4-1, greatly shortening the load energizing time. The transformer 5-1 and frequency converter 6-1 can be installed behind the cab of the fracturing truck 8-1 to facilitate the connection between the frequency converter 6-1 and the fracturing pump motor 7-1, and also facilitate operator control of the transformer 5-1 and frequency converter 6-1. Figure 3 As shown, transformer 5-1 can be a 10kV voltage level transformer, which is a 24-pulse phase-shifting transformer. By integrating the 10kV substation transformer and frequency converter 6-1 onto the fracturing truck 8-1, when the voltage level provided by the AC power grid is 10kV, it is only necessary to lay a high-voltage power transmission network 4-1 for transmitting 10kV voltage level at the well site to realize the power supply to the fracturing pump motor 7-1, thus optimizing the well site layout.

[0032] In another technical solution, multiple high-voltage switchgear 3-1, high-voltage transmission network 4-1, and fracturing vehicle 8-1 are provided, with one high-voltage switchgear 3-1 corresponding to one high-voltage transmission network 4-1 and one fracturing vehicle 8-1; the output terminal of the high-voltage switchgear 1-1 is electrically connected to the input terminal of the high-voltage busbar 2-1, and the high-voltage busbar 2-1 is provided with multiple output terminals, which are respectively electrically connected to the input terminals of multiple high-voltage switchgear 3-1.

[0033] In this technical solution, by setting up multiple high-voltage switch cabinets 3-1 and multiple high-voltage power transmission networks 4-1, power can be supplied to multiple fracturing pump motors 7-1. Multiple fracturing pump motors 7-1 distributed in different locations at the well site can be driven by a single high-voltage power transmission system, making it flexible in use.

[0034] In another technical solution, the circuit breakers in the multiple high-voltage switchgear 3-1 are all controlled to open or close via a remote monitoring platform.

[0035] In this technical solution, the circuit breaker is a frame-type circuit breaker. Sensors can be installed on the circuit breaker to collect its status signals. When the sensor detects current flowing through the line, it indicates that the circuit breaker is in the closed state; otherwise, it is in the open state. The sensor transmits the collected status signals to a remote monitoring platform via a communication network. The remote monitoring platform displays the circuit breaker's on / off status in a visual manner on the platform interface. Operators can send commands to control the circuit breaker's on / off state through the operation interface on the remote monitoring platform. These commands are sent to the circuit breaker's control unit via the communication network, which then controls the circuit breaker to close or open. The remote monitoring platform can remotely control the opening or closing of circuit breakers in multiple high-voltage switchgear 3-1 units to provide power and safety protection for each fracturing truck 8-1. It can also quickly switch the corresponding circuit breaker according to the downstream load requirements and the fault status of the fracturing truck 8-1, achieving flexible configuration of the number of fracturing trucks 8-1 in normal operation. The communication network can be 4G / 5G or Ethernet.

[0036] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A high-voltage power transmission system for fracturing systems, characterized in that, It includes an AC power grid, a high-voltage switchgear, a high-voltage transmission network, a transformer, and a fracturing pump motor. The input end of the high-voltage switchgear is electrically connected to the AC power grid, and the output end is electrically connected to the input end of the transformer through the high-voltage transmission network. It is used to distribute the voltage transmitted from the AC power grid to the transformer through the high-voltage transmission network. The output end of the transformer is electrically connected to the fracturing pump motor. The transformer is used to step down the voltage transmitted from the high-voltage transmission network and output it to drive the fracturing pump motor.

2. The high-voltage power transmission system for fracturing systems as described in claim 1, characterized in that, The output terminal of the transformer is electrically connected to the fracturing pump motor via a frequency converter.

3. The high-voltage power transmission system for fracturing systems as described in claim 2, characterized in that, A high-voltage switchgear is installed between the high-voltage switchgear and the high-voltage transmission network. The input terminal of the high-voltage switchgear is electrically connected to the output terminal of the high-voltage switchgear, and the output terminal of the high-voltage switchgear is electrically connected to the high-voltage transmission network.

4. The high-voltage power transmission system for fracturing systems as described in claim 3, characterized in that, The transformer, the frequency converter, and the fracturing pump motor are integrated into one unit via the fracturing truck.

5. The high-voltage power transmission system for fracturing systems as described in claim 4, characterized in that, Multiple high-voltage switchgear, high-voltage transmission network and fracturing vehicle are provided, with one high-voltage switchgear corresponding to one high-voltage transmission network and one fracturing vehicle; the output terminal of the high-voltage switchgear is electrically connected to the input terminal of the high-voltage busbar, and the high-voltage busbar has multiple output terminals, which are respectively electrically connected to the input terminals of multiple high-voltage switchgear.

6. The high-voltage power transmission system for fracturing systems as described in claim 5, characterized in that, The circuit breakers in the multiple high-voltage switchgear are all controlled to open or close via a remote monitoring platform.

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