CN-121984040-A - Gravity and electrochemical hybrid energy storage oil well micro-grid system and energy supply method

Abstract

The invention belongs to the field of oilfield well site energy supply, and discloses an oil well micro-grid system for gravity and electrochemical hybrid energy storage and an energy supply method. The system comprises a clean energy power generation device, an energy storage device, a production load, a power distribution device and an energy management device. The energy storage device comprises a gravity energy storage device and an electrochemical energy storage device, wherein the gravity energy storage device is formed by reforming an idle well of a well site. The system disclosed by the invention converts the super-generated energy of wind-solar power generation into potential energy to be stored in the gravity energy storage equipment, the gravity energy storage equipment can be used as a long-time energy storage device, and when wind-solar power output is insufficient and the energy supply of the electrochemical energy storage equipment is insufficient, the potential energy of the gravity energy storage equipment can be converted into electric energy to supply power for a load, so that the utilization rate of the energy is improved, and the stability of the energy supply of the system is enhanced. Moreover, the gravity energy storage equipment is formed by reforming an idle well of a well site, and is economical and environment-friendly.

Inventors

• LI HONGBIN
• ZHANG YUQING
• NING JIA
• LIANG BO
• HAN NINGNING
• WANG YANTAO
• SUN YANBO
• ZHOU LIFENG
• WANG TIANJIAO
• WANG SHUAI
• LIU ZHENNING
• MEI DONGLIANG
• WANG DAN

Assignees

• 辽河石油勘探局有限公司
• 中国石油天然气集团有限公司
• 中油辽河工程有限公司

Dates

Publication Date

20260505

Application Date

20241029

Claims (20)

1. 1. An oil well micro-grid system for gravity and electrochemical hybrid energy storage, comprising: A clean energy power generation device; The energy storage device comprises a gravity energy storage device and an electrochemical energy storage device, wherein the gravity energy storage device is formed by reforming an idle well of a well site; Production load; A power distribution device, wherein the power distribution device is electrically connected with the clean energy power generation device, the energy storage device and the production load; The energy management device monitors the power generation power of the clean energy power generation device, the power consumption of the production load and the energy storage state of the energy storage device, and controls the operation of the gravity energy storage device according to the power consumption, the power generation power and the energy storage state of the electrochemical energy storage device.
2. 2. The gravity and electrochemical hybrid energy storage oil well microgrid system according to claim 1, wherein said clean energy power generation means comprises photovoltaic power generation means and/or wind power generation means.
3. 3. The gravity and electrochemical hybrid energy storage oil well microgrid system according to claim 1, wherein said gravity energy storage device comprises a motor, a suspension mechanism and a counterweight, said motor being electrically connected to said power distribution device, said counterweight being connected to said suspension mechanism, said motor being capable of driving said suspension mechanism to operate to change the height of said counterweight within said idle well.
4. 4. A gravity and electrochemical hybrid energy storage oil well microgrid system according to claim 3, wherein said energy management device is configured to control said power distribution device to drive said motor to raise said counterweight when said generated power is higher than said used electric power and the stored energy of said electrochemical energy storage device reaches an upper limit.
5. 5. A gravity and electrochemical hybrid energy storage oil well microgrid system according to claim 3, wherein the energy management device is configured to control the distribution device to release the counterweight to drive the motor to generate electricity to power the production load and/or the electrochemical energy storage device when the generated power is below the used electric power and the stored energy of the electrochemical energy storage device reaches a lower limit value.
6. 6. The gravity and electrochemical hybrid energy storage oil well microgrid system according to claim 2, wherein said photovoltaic power generation device comprises a mobile photovoltaic power generation device disposed in proximity to said gravity energy storage device.
7. 7. The gravity and electrochemical hybrid energy storage oil well microgrid system according to claim 1, further comprising a photo-thermal device that collects heat to heat the oil tank.
8. 8. The gravity and electrochemical hybrid energy storage oil well microgrid system according to claim 1, further comprising a gas power generation device that employs a mobile gas power generator and utilizes associated gas of the wellsite for power generation.
9. 9. The gravity and electrochemical hybrid power storage oil well micro-grid system of claim 8, wherein the gas power generation device generates electricity in the event of insufficient continuous power output of the clean energy power generation device or increased production load power consumption in the wellsite.
10. 10. The gravity and electrochemical hybrid energy storage oil well microgrid system according to claim 8, wherein said production load comprises a pumping unit and a tank electrical heating mechanism.
11. 11. The gravity and electrochemical hybrid energy storage oil well micro-grid system according to claim 10, wherein the pumping unit is equipped with an intelligent intermittent component capable of collecting downhole pressure, temperature and liquid level data in all weather, identifying the running state of the oil well and automatically adjusting the start-stop period of the pumping unit in combination with the energy consumption of the well site.
12. 12. The gravity and electrochemical hybrid energy storage oil well microgrid system according to claim 1, wherein said electrochemical energy storage device employs a lithium battery.
13. 13. The gravity and electrochemical hybrid energy storage oil well microgrid system according to claim 1, further comprising a centralized control mechanism storing wellsite data and predictive models for predicting wellsite thermal energy, electrical energy trends, said centralized control mechanism being communicatively coupled to said energy management device.
14. 14. The gravity and electrochemical hybrid energy storage oil well micro-grid system of claim 13, wherein the wellsite data comprises data of electrical energy, thermal energy, and pressure, temperature, fluid level downhole at the wellsite.
15. 15. The gravity and electrochemical hybrid power storage oil well microgrid system according to claim 14, wherein said energy management device is configured to transmit wellsite data to said centralized control mechanism, said centralized control mechanism determining if electrical and thermal energy at a wellsite needs to be adjusted based on said wellsite data and said predictive model, and if so, sending an adjustment signal to said energy management device, said energy management device adjusting said clean energy generation device, said energy storage device, and said production load within a wellsite based on said adjustment signal.
16. 16. A method of powering an oil well, characterized in that the method is implemented with a system according to any one of claims 1-15 and comprises the steps of: Determining whether the power generated by the clean energy power generation device and the power consumption of the production load meet the balance of supply and demand; under the condition that supply and demand balance is met, increasing the power of the clean energy power generation device and storing redundant electric energy into electrochemical energy storage equipment; Adjusting operation of the gravity energy storage device to store super-generated electricity using the gravity energy storage device based on the electrochemical energy storage device reaching a storage upper limit; in the case of insufficient supply of electrical energy, supplying power with the electrochemical energy storage device; And under the condition that the electrochemical energy storage equipment is insufficient in electric energy, the gravity energy storage equipment is utilized for supplying power.
17. 17. The method of claim 16, wherein adjusting the operation of the gravity energy storage device comprises increasing a height of a counterweight of the gravity energy storage device within the well.
18. 18. The method as recited in claim 17, further comprising: before and/or after adjusting the operation of the gravity energy storage device, determining whether the counterweight reaches a highest point, and if the counterweight reaches the highest point, stopping adjusting the gravity energy storage device.
19. 19. The method of claim 18, wherein the tank electrical heating mechanism is operated with the counterweight at its highest point.
20. 20. The method according to claim 16, comprising: after the gravity energy storage equipment is used for supplying power, the liquid level, the pressure and the temperature of the oil well are compared with the corresponding limit values, if all indexes are in a safe range, the stop and the operation of the oil pumping unit are adjusted to reduce the power consumption, if any one of the indexes exceeds the limit value, an alarm signal is sent to the energy management device, and the energy management device starts the gas power generation device based on the alarm signal.

Description

Gravity and electrochemical hybrid energy storage oil well micro-grid system and energy supply method Technical Field The invention relates to the field of oilfield well site energy supply, in particular to an oil well micro-grid system for gravity and electrochemical hybrid energy storage and an energy supply method. Background The oilfield mechanical recovery system is a key facility for oil and gas resource development, the electric energy supply of the oilfield mechanical recovery system mainly depends on the commercial power of a large power grid, and the current commercial power structure mainly uses thermal power, so that two main problems are caused by the current situation that the carbon emission is large, global climate change coping is not facilitated, and the energy consumption cost is high, so that the production cost of an oilfield is increased. Natural gas is used as associated gas of an oil well, and although the power supply cost is reduced to a certain extent, the direct combustion power supply mode also has the problem of large carbon emission, and is contrary to the development goal of green low carbon. In view of the current dual challenges of high energy cost and large carbon emissions in the oil field, academia and industry are searching innovative solutions. One promising proposal is to introduce and build new energy systems at oilfield wellsites as a green alternative to the traditional grid power mode. The core of the new energy system is to fully integrate and utilize a large amount of idle land resources in the oilfield well site, and dispose green energy supply equipment such as a photovoltaic power generation panel, a wind generating set and the like according to local conditions. The patent CN117595271A discloses an oilfield well field energy dispatching method and device, and the related comprehensive function model comprises four parts of a well field new energy micro-grid, a power grid, well field load and energy storage equipment, wherein the comprehensive function model is an energy supply system taking a diesel generator as an auxiliary power generation and taking photovoltaics and energy storage as main power generation. The well site new energy micro-grid is mainly used for generating power by photovoltaic equipment, and the energy storage equipment is mainly a battery. However, using only batteries as an energy storage device presents some problems for well site power. For example, the capacity of a battery affects the reliability and economy of operation of a photovoltaic device to some extent, and when the capacity configuration of the battery is relatively small, the load demand for a certain period of time (e.g., oil extraction and electrical heating of an oil tank are performed simultaneously) may not be satisfied, and when the capacity configuration is relatively large, the reliability of the energy supply system may be improved, but the initial construction cost may be greatly increased. Moreover, due to the capacity limitation of the battery, the capacity of the photovoltaic device for absorbing the electric energy generated by the photovoltaic device is limited, so that the photovoltaic device has high light and electricity discarding rate and low resource utilization rate. Accordingly, there is a need for improvements to current oil well microgrid systems to increase their energy utilization efficiency. Disclosure of Invention In order to solve the problems, the invention provides an oil well micro-grid system with gravity and electrochemical hybrid energy storage and an energy supply method. According to an aspect of the present invention, there is provided an oil well micro-grid system for gravity and electrochemical hybrid energy storage, the system comprising: A clean energy power generation device; The energy storage device comprises a gravity energy storage device and an electrochemical energy storage device, wherein the gravity energy storage device is formed by reforming an idle well of a well site; Production load; A power distribution device, wherein the power distribution device is electrically connected with the clean energy power generation device, the energy storage device and the production load; The energy management device monitors the power generation power of the clean energy power generation device, the power consumption of the production load and the energy storage state of the energy storage device, and controls the operation of the gravity energy storage device according to the power consumption, the power generation power and the energy storage state of the electrochemical energy storage device. According to one embodiment of the invention, the clean energy power generation device comprises a photovoltaic power generation device and/or a wind power generation device. According to one embodiment of the invention, the gravity energy storage device comprises a motor, a suspension mechanism and a counterweight, wherein the motor is elect