Oil well energy storage energy recovery system

Abstract

The utility model discloses an oil well energy storage and recovery system which comprises an energy storage module, an energy recovery module, an oil well power distribution cabinet frequency conversion and speed regulation module and a motor connected with the oil well power distribution cabinet frequency conversion and speed regulation module. The energy storage module is provided with a first branch and a second branch which are used for recovering, storing and transmitting energy. According to the oil well energy storage energy recovery system, redundant electric energy generated in the operation process of oil well equipment is recovered and stored, so that the energy utilization efficiency is remarkably improved, the consumption of external energy is reduced, and the operation cost is reduced. And the system stores the recovered electric energy through the energy storage module, and supplies the electric energy to equipment for use when needed, so that the energy waste is reduced. In addition, a photovoltaic cell panel is arranged, so that the system can utilize solar energy to supplement and store energy, and dependence on traditional energy is further reduced. Through the design of real-time current monitoring, an intelligent control switch and an anti-reverse diode, the stability and safety of the system are ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to an oil well energy storage energy recovery system and belongs to the technical field of energy engineering. BACKGROUND

[0002] With the increasing global energy demand and the increasing proportion of renewable energy, energy storage technology has become one of the key technologies to ensure the reliability and stability of energy supply, but there are still problems in energy storage and feedback in many fields, such as the lack of targeted energy recovery system modification in some specific application scenarios, high cost, limited resources, and so on.

[0003] In oilfield exploitation, beam pumping unit as a common oil pumping equipment, its load characteristics show time-varying load, periodic change and the existence of dynamic load and static load. Especially when the motor starts, the starting torque is usually 3 to 4 times the actual load, resulting in a significant difference between the rated power of the motor and the actual load power, forming the phenomenon of "big horse pulling small cart", causing energy waste and high electricity cost, and the energy recovery and storage of the oil pumping system are needed to reduce the waste of reactive power and realize the reuse of electric energy. Moreover, in the four-bar linkage mechanism of beam pumping unit, the oil pumping load and the balance weight load are difficult to match completely. In addition, in some cases, the motor may enter the regenerative power generation state due to load change, converting part of the mechanical energy into electric energy and feeding back to the power grid, resulting in the increase of the DC bus voltage of the frequency converter main circuit, and causing the phenomenon of reverse power generation. The traditional solution eliminates reverse power generation through brake resistor and brake unit, but the brake resistor converts electric energy into heat energy, which cannot be effectively utilized, causing additional energy waste.

[0004] Therefore, it is necessary to design a new type of oil well energy storage energy recovery system, which can charge the excess electric energy to the energy storage device, complete energy recovery, avoid energy waste of brake resistor, and also provide storage energy for the energy recovery system by using renewable energy, so as to meet the demand for high efficiency and energy saving in long-term energy management in oilfield. Utility model content

[0005] Therefore, the utility model aims to provide an oil well energy storage energy recovery system which can avoid energy waste of brake resistor and store and recover energy.

[0006] In order to achieve the above object, the utility model discloses an oil well energy storage energy recovery system, including energy storage module, energy recovery module, oil well distribution cabinet variable frequency speed regulation module and motor with oil well distribution cabinet variable frequency speed regulation module interface, the energy storage module is used for the passage of recovery storage and transmission energy and is first branch and second branch, first branch, with energy recovery module and oil well distribution cabinet variable frequency speed regulation module are connected in proper order with the energy storage module as starting point, second branch, with oil well distribution cabinet variable frequency speed regulation module is connected in series with the energy storage module as starting point, first branch and second branch are parallelly connected.

[0007] The energy storage module includes a battery cluster, a high-voltage box, a PCS module, a photovoltaic cell panel, and a first DC / DC converter.

[0008] The battery cluster is a sodium ion battery.

[0009] The battery cluster and the high-voltage box are both multiple, and the number of the battery cluster and the high-voltage box is in one-to-one correspondence.

[0010] The energy recovery module includes a second DC / DC converter, a control switch, and an anti-reverse diode.

[0011] The control switch is arranged between the second DC / DC converter and the anti-reverse diode.

[0012] A current sensor is further arranged between the energy recovery module and the energy storage module, and the current sensor is used to measure the current recovered by the PCS module output end and the second DC / DC converter.

[0013] The oil well distribution cabinet variable frequency speed regulation module includes an uncontrolled rectification diode, a capacitor connected with a direct current bus, an inverter, a braking unit, and a braking resistor connected with the braking unit.

[0014] A buried cable is arranged in the connection line between the energy recovery module and the oil well distribution cabinet variable frequency speed regulation module.

[0015] By adopting the above technical solution, the oil well energy storage and recovery system of this utility model significantly improves energy utilization efficiency, reduces external energy consumption, and lowers operating costs by recovering and storing excess electrical energy generated during the operation of oil well equipment. The system stores the recovered electrical energy through an energy storage module and supplies it to the equipment when needed, reducing energy waste. Furthermore, the inclusion of photovoltaic panels allows the system to utilize solar energy for supplementary energy storage, further reducing dependence on traditional energy sources. Moreover, the design of real-time current monitoring, control switches, and reverse-biased diodes ensures the stability and safety of the system. Attached Figure Description

[0016] Fig. 1 This is the circuit diagram of this utility model.

[0017] Fig. 2 This is a schematic diagram of the excess energy recovery of this utility model. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] like Figs. 1-2 As shown, the oil well energy storage and recovery system of this utility model includes an energy storage module 1, an energy recovery module 2, an oil well power distribution cabinet frequency converter module 3, and a motor 4 connected to the oil well power distribution cabinet frequency converter module 3. The energy storage module 1 has a first branch and a second branch for recovering, storing, and transmitting energy. The first branch connects the energy recovery module 2 and the oil well power distribution cabinet frequency converter module 3 in series, starting from the energy storage module 1. The second branch connects the energy storage module 1 in series with the oil well power distribution cabinet frequency converter module 3. The first and second branches are connected in parallel. Through the parallel design of the first and second branches, efficient energy recovery and transmission are achieved, enabling the system to flexibly schedule energy under different operating conditions and avoid energy waste. The energy storage module 1 not only recovers and stores excess energy but can also efficiently feed energy back into the system through the energy recovery module 2, which helps to improve the overall energy utilization rate. In addition, the energy flow path was optimized to ensure good cooperation between the energy recovery module 2 and the oil well power distribution cabinet frequency conversion speed control module 3.

[0020] The energy storage module 1 includes a battery cluster 11, a high-voltage box 12, a PCS module 13, a photovoltaic cell panel 14, and a first DC / DC converter 15. The battery cluster 11 is connected in series with the high-voltage box 12 and the PCS module 13 in turn. The output end of the photovoltaic cell panel 14 is connected to the input end of the first DC / DC converter 15, and the output end of the first DC / DC converter 15 is connected to the PCS module 13. The battery cluster 11 can store excess electrical energy, and the high-voltage box 12 and the PCS module 13 effectively control the flow and conversion of electrical energy, ensuring the safe and stable operation of the energy storage system. In addition, the photovoltaic cell panel 14 can provide additional energy supplement during the day or when the sunlight is sufficient, reducing the dependence on the external power grid and further improving the self-sufficiency of the system. The first DC / DC converter 15 efficiently converts energy between the photovoltaic cell panel 14 and the PCS module 13, enabling the photovoltaic power generation to smoothly supply the energy storage module 1, maximizing the energy utilization efficiency.

[0021] PCS stands for Power Conversion System, which is a device connecting the photovoltaic cell panel 14 and the power grid. The main function of the PCS is to convert the current generated by the photovoltaic cell panel 14 into a current suitable for the power grid. In addition, the PCS also has the function of Maximum Power Point Tracking (MPPT) to improve the overall efficiency of the photovoltaic system.

[0022] The battery cluster 11 is a sodium-ion battery. Compared with traditional lithium-ion batteries, sodium-ion batteries have more abundant sodium resources and lower costs, which can significantly reduce the overall cost of the energy storage system and have higher economic efficiency. Moreover, sodium-ion batteries have better safety, especially in high-temperature environments, with better stability, reducing the safety risks caused by temperature fluctuations or failures in the system.

[0023] The battery cluster 11 and the high-voltage box 12 are both multiple, and the number of battery clusters 11 and high-voltage boxes 12 is one-to-one, which makes the working state of each battery cluster 11 and high-voltage box 12 more independent, effectively disperses the risk of failure, and improves the reliability and fault tolerance of the system. If a battery cluster 11 fails, it only affects the corresponding high-voltage box 12 and does not have a major impact on other battery clusters 11 and the overall operation of the system. In addition, multiple battery clusters 11 and high-voltage boxes 12 can be flexibly combined and allocated according to the load demand, enhancing the scalability and flexibility of the system, and adapting to different scales of energy storage demand.

[0024] The energy recovery module 2 includes a second DC / DC converter 21, a control switch 22, and a reverse prevention diode 23. One end of the second DC / DC converter 21 is connected in series with the cathode of the reverse prevention diode 23, the other end of the second DC / DC converter 21 is connected with the energy storage module 1, and the anode of the reverse prevention diode 23 is connected with the oil well distribution cabinet variable frequency speed regulation module 3. The second DC / DC converter 21 can efficiently transfer energy from the oil well distribution cabinet variable frequency speed regulation module 3 to the energy storage module 1, realize effective recovery and storage of energy, and improve the energy utilization efficiency of the system. The reverse prevention diode 23 is arranged in the circuit to prevent reverse flow of current, protect system components, avoid damage to the battery cluster 11 or other sensitive components caused by reverse current, and improve the safety and stability of the system. Moreover, the design of the reverse prevention diode 23 cooperates with the second DC / DC converter 21 to ensure one-way flow of the energy recovery path, so that the energy storage module 1 can efficiently receive and store excess energy from the variable frequency speed regulation module. In addition, the control switch 22 provides a flexible control means, which can adjust the energy recovery process according to the demand of the system, and improve the flexibility and adjustability of the system.

[0025] The control switch 22 is arranged between the second DC / DC converter 21 and the reverse prevention diode 23 to provide higher flexibility and controllability, which can adjust the timing and method of energy recovery according to the load demand or running state, and optimize the overall operation efficiency of the system. In addition, the control switch 22 can effectively isolate the circuit during debugging, maintenance and repair, ensuring the safety of the operator and avoiding misoperation or electrical failure.

[0026] The current sensor 5 is arranged between the energy recovery module 2 and the energy storage module 1, which is used to measure the current output by the PCS module 13 and recovered by the second DC / DC converter 21. The current sensor 5 can monitor the current output by the PCS module 13 and recovered by the second DC / DC converter 21 in real time, ensure that the flow of electrical energy in the system meets the predetermined design requirements, and help optimize the energy recovery process. By monitoring the current, the system can timely adjust the energy flow path or control strategy to avoid efficiency loss or system instability caused by excessive or insufficient current. In addition, the current sensor 5 can also be used for energy management, real-time feedback of recovered energy data, help adjust the charging strategy of the energy storage module 1, ensure that the energy storage system operates in the best state, and thus improve the energy efficiency of the whole system.

[0027] The oil well distribution cabinet variable frequency speed regulation module 3 comprises an uncontrolled rectification diode 31, a capacitor 32 connected with a direct current bus, an inverter 33, a braking unit 34, and a braking resistor 35 connected with the braking unit 34; the uncontrolled rectification diode 31 is connected in parallel with the inverter 33, and the capacitor 32 is arranged in parallel between the uncontrolled rectification diode 31 and the inverter 33; the braking unit 34 is connected with both ends of the inverter 33 in parallel; and the energy recovery module 2 is connected with both ends of the uncontrolled rectification diode 31 in parallel. By connecting the uncontrolled rectification diode 31 and the inverter 33 in parallel, the regenerated energy of the motor 4 is effectively converted into electric energy and fed back to the energy storage module 1, reducing energy waste. The parallel arrangement of the capacitor 32 smoothes current fluctuations, ensuring the stability and reliability of the system, and at the same time providing instantaneous power support for the inverter 33. The cooperation of the braking unit 34 and the braking resistor 35 effectively absorbs and consumes the regenerated energy of the motor, ensuring the smooth deceleration of the system. The parallel design of the energy recovery module 2 and the uncontrolled rectification diode 31 prevents energy from flowing in the opposite direction, ensuring the safe operation of the system.

[0028] When the motor 4 needs to decelerate or stop, the braking unit 34 and the braking resistor 35 work together to convert the regenerated energy of the motor into heat energy and consume it, and at the same time the energy feedback module can feed back the excess electric energy to the energy storage module 1 through the first branch.

[0029] The connection line between the energy recovery module 2 and the oil well distribution cabinet variable frequency speed regulation module 3 is provided with a buried cable, which is used to effectively reduce the physical damage of the external environment to the cable, such as preventing mechanical impact, chemical corrosion or weather changes, etc. affecting the cable, prolonging the service life of the cable. In addition, buried layout can improve the safety of the system, avoid the exposure of the cable in the external environment, and cause electric shock or fire safety hazards, especially in the complex environment of oil wells, buried cables help to improve the overall safety protection level.

[0030] In the process of oil drilling, the AC variable frequency motor 4 and its control system are often applied to the brake control of winches and other equipment. Among them, the braking unit 34 of the brake cabinet and the braking resistor 35 outside the frequency conversion room jointly constitute the braking system of the winch. When the winch needs to be braked, the brake motor 4 starts to work and enters the generating state, and the motor rotates in reverse to generate braking torque. The electric energy generated in this process is transmitted to the direct current cabinet bus through the inverter 33, and when the voltage is higher than the set value, the braking control unit will automatically turn on the braking resistor 35 to realize energy consumption braking. This cooperative braking mode not only improves the braking effect, but also realizes the recovery and utilization of energy.

[0031] By the above technical scheme, the oil well energy storage energy recovery system recovers and stores the excess electric energy generated in the operation process of the oil well equipment, significantly improves the energy utilization efficiency, reduces the consumption of external energy, and reduces the operation cost. The system stores the recovered electric energy through the energy storage module 1, and supplies the equipment with the electric energy when needed, thereby reducing energy waste. In addition, the photovoltaic cell panel 14 is provided, so that the system can supplement the energy storage by using solar energy, further reducing the dependence on traditional energy, and through the design of real-time current monitoring, control switch 22 and anti-reverse diode 23, the stability and safety of the system are ensured.

[0032] Obviously, the above embodiments are only examples for clearly illustrating, but not limit the embodiments. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments need not and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the utility model.

Claims

1. An oil well energy storage energy recovery system characterized by: The energy storage module, the energy recovery module, the oil well distribution cabinet variable frequency speed regulation module, and the motor connected with the oil well distribution cabinet variable frequency speed regulation module are included; the energy storage module is used for recovering, storing, and transmitting energy, and the passage is a first branch and a second branch; the first branch, taking the energy storage module as a starting point, sequentially connects the energy recovery module and the oil well distribution cabinet variable frequency speed regulation module in series; the second branch, taking the energy storage module as a starting point, is connected with the oil well distribution cabinet variable frequency speed regulation module in series; and the first branch and the second branch are connected in parallel.

2. The oil well energy storage energy recovery system of claim 1, wherein: The energy storage module includes a battery cluster, a high-voltage box, a PCS module, a photovoltaic cell panel, and a first DC / DC converter; the battery cluster is sequentially connected with the high-voltage box and the PCS module in series, the output end of the photovoltaic cell panel is connected with the input end of the first DC / DC converter, and the output end of the first DC / DC converter is connected with the PCS module.

3. The oil well energy storage energy recovery system of claim 2, wherein: The battery cluster is a sodium ion battery.

4. The oil well energy storage energy recovery system of claim 2, wherein: The battery cluster and the high-voltage box are both multiple, and the number of the battery cluster and the high-voltage box is in one-to-one correspondence.

5. The oil well energy reservoir energy recovery system of claim 1, wherein: The energy recovery module includes a second DC / DC converter, a control switch, and an anti-reverse diode; one end of the second DC / DC converter is connected with the cathode of the anti-reverse diode in series, the other end of the second DC / DC converter is connected with the energy storage module, and the anode of the anti-reverse diode is connected with the oil well distribution cabinet variable frequency speed regulation module.

6. The oil well energy reservoir energy recovery system of claim 5, wherein: The control switch is arranged between the second DC / DC converter and the anti-reverse diode.

7. The oil well energy reservoir energy recovery system of claim 5, wherein: A current sensor is further arranged between the energy recovery module and the energy storage module, and the current sensor is used for measuring the current recovered by the PCS module output end and the second DC / DC converter.

8. The oil well energy reservoir energy recovery system of claim 1, wherein: The oil well distribution cabinet variable frequency speed regulation module includes an uncontrolled rectification diode, a capacitor connected with a direct current bus, an inverter, a braking unit, and a braking resistor connected with the braking unit; the uncontrolled rectification diode is connected with the inverter in parallel, the capacitor is arranged in parallel between the uncontrolled rectification diode and the inverter; the braking unit is connected with both ends of the inverter in parallel; and the energy recovery module is connected with both ends of the uncontrolled rectification diode in parallel.

9. The oil well energy reservoir energy recovery system of claim 8, wherein: The connection line of the energy recovery module and the oil well distribution cabinet variable frequency speed regulation module is provided with a buried cable.

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