Integrated electric control system of electric pressure-driven water injection device

Abstract

The utility model discloses an integrated electric control system of an electric pressure-driven water injection device, which comprises a dual-power-supply power transformation and distribution system, a frequency conversion all-in-one machine system and an integrated control cabinet unit, the dual-power-supply power transformation and distribution system comprises a phase-shifting transformer; an output winding of the phase-shifting transformer comprises a main winding and an auxiliary winding, the main winding is connected with the frequency conversion all-in-one machine system, and the auxiliary winding is connected with the integrated control cabinet unit. A dual-power-supply power transformation and distribution system is adopted, the requirements of two kinds of well site network power voltage level operation can be met, a phase-shifting transformer is used for power transformation, and harmonic interference of a power grid can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas field technology, specifically to an integrated electrical control system for an electric pressure-driven water injection device. Background Technology

[0002] Pressure-driven water injection technology utilizes pressure-driven equipment to rapidly inject high-pressure fluid into the bottom of the well, forming an effective fracture network and increasing formation energy. As a new production enhancement process, it combines the advantages of hydraulic fracturing and has a good oil displacement effect, effectively improving oil recovery. Currently, pressure-driven technology is widely used in oilfields such as Shengli, Daqing, Xinjiang, and East China. In Shengli Oilfield alone, there are 536 under-injected wells in low-permeability reservoirs, with water injection volumes of 700-800 m³. 3 Approximately 40% of wells in low-permeability reservoirs are under-injected, resulting in significant workload and equipment requirements for hydraulic pressure drive operations. In recent years, with increasing emphasis on hydraulic pressure drive in oilfields both domestically and internationally, coupled with the advantages of grid-driven systems such as "no noise, no oil pollution, and energy efficiency," electric hydraulic pressure drive has become a trend. However, the lightweight integration and safe application of electric hydraulic pressure drive units require optimization of the overall configuration and layout to address the challenges of transportation, hoisting, and wiring workloads; the development of safe operating procedures and emergency plans for hydraulic pressure drive water injection is necessary to ensure safe operation; and the realization of unmanned well site operation is crucial to reduce personnel costs. Currently, many oilfields have a large number of under-injected wells in low-permeability reservoirs, leading to significant workload and equipment requirements for hydraulic pressure drive operations, high overall energy consumption, and substantial disassembly and assembly work.

[0003] To improve the reliability of pressure-driven pump operation, ensure efficient equipment operation, and facilitate on-site relocation, the electric pressure-driven water injection device integrated electrical control system provided by this patent mainly equips the pressure-driven electrical control system with a 10kV and 6kV dual-power distribution system, a frequency converter integrated system, and remote monitoring and operation, which can adapt to well site wiring for different grid voltage levels. The integration of power supply and distribution and frequency conversion control into a single skid greatly facilitates relocation and reduces a significant amount of cable connection work. Operation data monitoring and remote operation provide efficient and safe assurance for operations and can effectively respond to various emergency situations.

[0004] Announcement No. CN104734058B discloses an integrated electrical control device for an oilfield joint station, including a skid. The skid is divided into a combined transformer room and a low-voltage distribution room by a partition. The low-voltage distribution room is equipped with a low-voltage distribution unit, a control unit, a communication unit, and a UPS unit. The combined transformer room is fixed with a combined transformer. All equipment in the skid is connected by cables, which are located in the connecting space inside the skid base below the floor of the combined transformer room and the low-voltage distribution room.

[0005] Publication No. CN106200536A discloses an integrated electrical control device for an oilfield RTU valve chamber, comprising a power distribution unit, a communication unit, and an instrument control unit housed within a casing. The power distribution unit is electrically connected to both the communication unit and the instrument control unit, supplying power to each unit. The communication unit is electrically connected to both the communication unit and the instrument control unit, and is also electrically connected to an upstream station. The communication unit transmits production data signals monitored by various instruments in the instrument control unit to the upstream station. The instrument control unit includes at least an RTU system, which receives uninterrupted power from the power distribution unit. The RTU system can transmit data generated during production to the upstream station via the communication unit.

[0006] Publication No. CN205450856U discloses an automatic voltage regulation power supply device for a fine water injection system, including a current sampling circuit, a high common-mode voltage amplifier circuit, a differential processing circuit, a CPU with an AD module and a DA module, a signal amplification circuit, a programmable power supply, a cable, and a load. The current sampling circuit is used to collect the current signal of the load and transmit the current signal to the high common-mode voltage amplifier circuit. The signal output by the high common-mode voltage amplifier circuit is converted into a differential signal after passing through the differential processing circuit and enters the AD module of the processor. The processor calculates the voltage drop on the cable based on the collected current value, adjusts the output voltage, and then outputs the signal to the programmable power supply through the signal amplification circuit via the DA module to achieve automatic voltage regulation.

[0007] The structure of the existing power distribution system described above differs from that of this utility model.

[0008] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of this utility model. For more technical features, technical problems to be solved, and beneficial effects of this utility model, the above-disclosed technical documents do not provide any technical inspiration. Utility Model Content

[0009] In view of the above-mentioned defects in the existing technology, the purpose of this utility model is to provide an integrated electrical control system for an electric pressure-driven water injection device.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] An integrated electrical control system for an electric pressure-driven water injection device includes a dual-power distribution system, a frequency converter system, and an integrated control cabinet unit. The dual-power distribution system includes a phase-shifting transformer. The output winding of the phase-shifting transformer includes a main winding and an auxiliary winding. The main winding is connected to the frequency converter system, and the auxiliary winding is connected to the integrated control cabinet unit.

[0012] Furthermore, the input winding of the phase-shifting transformer in the dual-power distribution system can be adapted to connect to two different voltage levels of grid power.

[0013] Specifically, two main windings are provided, both of which are connected to the frequency converter system. The two main windings form a phase shift angle through a star or delta connection.

[0014] Furthermore, the phase-shifting transformer is equipped with a temperature controller.

[0015] Furthermore, it also includes signal acquisition sources and remote integrated control platforms;

[0016] Specifically, the signal acquisition source is communicatively connected to the integrated control cabinet unit, and the integrated control cabinet unit establishes a communication connection with the remote integrated control platform.

[0017] Furthermore, the remote integrated control platform is a portable remote operation terminal.

[0018] Furthermore, the variable frequency integrated machine system includes a frequency converter and a pressure drive pump motor, and the frequency converter and pressure drive pump motor are integrated into a single design.

[0019] Furthermore, the integrated control cabinet unit includes a data monitoring unit and a programmable controller. The data monitoring unit receives data from the acquired signal source, and the programmable controller receives control commands from the remote operation terminal. The programmable controller controls the pressure pump motor through a frequency converter.

[0020] Furthermore, it also includes a data monitoring and analysis unit and a data remote transmission unit.

[0021] Furthermore, the dual-power distribution system, the frequency converter system, the integrated control cabinet unit, and the signal acquisition source are all integrated onto a single work skid.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. The electrical control system and the work skid of this utility model are integrated into a single skid base. Compared with the traditional electric drive skid, this reduces the need for an electrical control room and avoids the problem of reconnecting all cables between the electrical control room and the work skid for each pressure drive operation, thus greatly improving work efficiency.

[0024] 2. The comprehensive and coordinated control of the remote integrated control platform enables operations to be carried out in a safe area at a distance, and allows for real-time online monitoring of operation data curves, thereby providing reasonable guidance for construction operations and anticipating emergency situations in advance.

[0025] 3. Data monitoring, analysis, and remote data transmission functions enable the collection of various operation-related data to the cloud or local terminal, forming operation curves and recording them. This can provide guidance for engineering construction and provide intuitive data support for effective analysis and response to various emergencies.

[0026] 4. A dual-power distribution system is adopted to meet the operational needs of two different grid voltage levels at the well site. The primary 10kV and 6kV high-voltage incoming lines utilize standard high-voltage switchgear with "five-proof" functions, ensuring high reliability and safety, and featuring an interlocking design between the 10kV and 6kV incoming lines. The use of phase-shifting transformers further reduces harmonic interference from the power grid. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the integrated electrical control system of an electric pressure-driven water injection device according to this utility model;

[0028] Figure 2 This is a control diagram of an electric pressure-driven water injection device according to this utility model.

[0029] In the diagram: 1. Dual-power distribution system; 2. Variable frequency drive system; 3. Integrated control cabinet unit; 4. Data monitoring, analysis and remote data transmission unit; 5. Remote integrated control platform; 6. Signal acquisition source.

[0030] VFD (Variable Frequency Drive), frequency converter; PC (Paragraph Controller), remote control terminal; PLC (Programmable Logic Controller); SM (Data); M (Pressure Pump Motor); i p The output pressure signal. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Example 1:

[0033] Please see Figure 1 This embodiment provides an integrated electrical control system for an electric pressure-driven water injection device, including a dual-power distribution system 1, a frequency converter integrated system 2, an integrated control cabinet unit 3, a data monitoring and analysis and data remote transmission unit 4, a remote integrated control platform 5, and a signal acquisition source 6.

[0034] The dual-power distribution system 1 includes two selectable grid power inputs and a phase-shifting transformer. The output winding of the phase-shifting transformer includes a main winding and an auxiliary winding. The main winding is connected to the frequency converter integrated system 2, and the auxiliary winding is connected to the integrated control cabinet unit 3.

[0035] The integrated control cabinet unit 3 establishes a communication connection with the data monitoring and analysis and data transmission unit 4 and the remote integrated control platform 5; the acquisition signal source 6 establishes a communication connection with the integrated control cabinet 3.

[0036] Among them, the main winding of the phase-shifting transformer of the dual-power distribution system 1 is connected to the frequency converter integrated system 2, which can reduce the harmonic interference of the power grid.

[0037] Among them, the integrated control cabinet unit 3 collects data from the large pump pressure, lubricating oil pressure, lubricating oil temperature, frequency converter, and electrical energy parameters of the pressure drive skid from the acquisition signal source 6, and transmits them to the data monitoring and analysis and data transmission unit 4 and the remote integrated control platform 5. The data monitoring terminal computer records the operation data and generates corresponding operation curves as needed. In addition, the operation skid can be remotely operated in a visual manner through the remote integrated control platform.

[0038] Specifically, the input winding of the phase-shifting transformer of the dual-power distribution system 1 is connected to two selectable grid power supplies. The two selectable grid power supply inputs are 10kV and 6kV. The main winding is two 12-pulse AC600V circuits that supply power to the frequency converter integrated machine system 2. The auxiliary winding is AC400V that supplies power to the integrated control cabinet unit 3.

[0039] Among them, the relative error of the voltage accuracy of the two 12-pulse AC600V main windings is within 2%, the phase shift angle error is <±1°, and the voltage ratio error is <±2%. In order to ensure the balance of rectified current, the impedance voltage deviation of the two main windings is less than 0.5%.

[0040] Among them, the two 12-pulse AC600V main windings form a phase shift angle through star or delta connection, so that the 5th and 7th order main harmonics generated by the two rectifier bridges cancel each other out, greatly reducing the types of harmonics and reducing the interference of power grid harmonics.

[0041] The phase-shifting transformer is equipped with a temperature controller, which sets the temperature according to actual operating requirements to achieve automatic start and stop, resulting in good energy-saving effect.

[0042] Among them, the dual-power distribution system integrates 10kV and 6kV medium-voltage switchgear and phase-shifting transformers on a skid in a small room, which can play a protective role without the need for a separate skid.

[0043] The 10kV and 6kV high-voltage incoming lines of the dual-power distribution system 1 adopt standard high-voltage switchgear with "five-proof" functions, ensuring high reliability and safety. The 10kV and 6kV incoming lines are also interlocked. The entire 10kV and 6kV high-voltage switchgear system has strict power-on and power-off operation procedures and is equipped with a remote emergency stop function, adding an extra layer of protection for standardized operation and safety on site.

[0044] The dual-power distribution system 1, the frequency converter integrated system 2, the integrated control cabinet unit 3, and the signal acquisition source 6 are all integrated onto a single work skid. Compared to traditional electric drive skids, this eliminates the need for an electrical control room, avoiding the problem of reconnecting all cables between the control room and the work skid for each pressure drive operation, thus greatly improving operational efficiency.

[0045] Among them, the integrated control cabinet unit 3 is the central control center of the entire electric control system. It integrates all control rights of the pressure drive skid and collects and summarizes signals such as the pressure of the large pump, the pressure of the lubricating oil, the temperature of the lubricating oil, the frequency converter, and the power parameters. Finally, it provides all control and data information to the remote integrated control platform 5.

[0046] Among them, the remote integrated control platform 5 can set overpressure protection for the pressure drive skid, preset the grease lubrication operation time and automatically start and stop, preset the cooling system temperature and automatically start and stop, and also has important data alarm functions such as transformer temperature, lubricating oil temperature, motor temperature, and large pump pressure, and realize fault interlock protection function.

[0047] Among them, the data monitoring and analysis and data transmission unit 4 and the remote integrated control platform 5 are portable terminals placed in the well site operation duty room and used in conjunction with each other. They can also transmit data to the cloud. The remote integrated control platform 5 is a remote operation terminal PC, which can be existing devices such as mobile phones and computers.

[0048] Through the integrated and coordinated control of the integrated control cabinet unit 3, the data monitoring and analysis and data transmission unit 4, and the remote integrated control platform 5, it is possible to carry out operations in a safe area at a distance, and to monitor the operation data curves online in real time, thereby providing reasonable guidance for construction operations and predicting emergency situations in advance, so as to maximize the efficiency and reliability of pressure drive operations.

[0049] The integrated control cabinet unit 3 includes a data monitoring unit DM and a programmable logic controller (PLC). The frequency converter integrated machine system 2 includes a frequency converter (VFD) and a pressure drive pump motor (M). The frequency converter (VFD) and the pressure drive pump motor (M) are integrated in a design, and no separate external cable is required between the frequency converter (VFD) and the pressure drive pump motor (M).

[0050] Example 2:

[0051] An integrated electrical control system for an electric pressure-driven water injection device, as described in Example 1, is used during pressure-driven operation.

[0052] During the pressure drive operation, the frequency converter (VFD) drives the pressure pump motor M to work, such as... Figure 2 The control diagram of the electric pressure-driven water injection device shows that commands are sent from a remote operation terminal PC to a programmable logic controller (PLC). The PLC drives a frequency converter (VFD) to control the pressure pump motor M, transmitting the pressure signal i output by the pressure pump. p Feedback is sent to the programmable logic controller (PLC) for interlocking protection; data SM from the acquisition signal source 6, such as lubricating oil pressure, lubricating oil temperature, frequency converter, and electrical energy parameters, are centrally acquired and processed by the PLC; the data monitoring unit DM comprehensively processes all information from the PLC, can fit the operation curve according to the on-site requirements, monitor the on-site operation in real time, and provide effective operation guidance for the remote operation terminal PC.

[0053] This invention can fit the operation curve according to the on-site requirements, monitor the on-site operation in real time, and provide effective operation guidance for remote operation terminal PC.

[0054] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0055] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0056] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., 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 unit 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.

[0057] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0058] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An integrated electrical control system for an electric pressure-driven water injection device, comprising a dual-power distribution system, characterized in that, It also includes frequency converter integrated systems and integrated control cabinet units; The dual-power distribution system includes a phase-shifting transformer; The output winding of the phase-shifting transformer includes a main winding and an auxiliary winding. The main winding is connected to the frequency converter integrated system, and the auxiliary winding is connected to the integrated control cabinet unit. It also includes signal acquisition sources and remote integrated control platforms; The signal acquisition source is communicatively connected to the integrated control cabinet unit, and the integrated control cabinet unit establishes a communication connection with the remote integrated control platform; It also includes a data monitoring and analysis unit and a data remote transmission unit; The integrated control cabinet unit establishes a communication connection with the data monitoring and analysis and data remote transmission unit; The data monitoring and analysis unit and the remote data transmission unit, as well as the remote integrated control platform, are portable terminals. The variable frequency integrated machine system includes a frequency converter and a pressure drive pump motor, and the frequency converter and the pressure drive pump motor are integrated into one design; The integrated control cabinet unit includes a data monitoring unit and a programmable controller. The data monitoring unit receives data from the acquired signal source, and the programmable controller receives control commands from the remote integrated control platform. The programmable controller controls the pressure drive pump motor through a frequency converter. The dual-power distribution system, frequency converter system, integrated control cabinet unit, and signal acquisition source are all integrated on a single work skid.

2. The integrated electrical control system for an electric pressure-driven water injection device according to claim 1, characterized in that, The input winding of the phase-shifting transformer in the dual-power distribution system can be adapted to connect to two different voltage levels of grid power. Two main windings are provided, both of which are connected to the frequency converter system. The two main windings form a phase shift angle through a star or delta connection.

3. The integrated electrical control system for an electric pressure-driven water injection device according to claim 1, characterized in that, The phase-shifting transformer is equipped with a temperature controller.

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