CN-121984103-A - Off-grid oil well energy supply system and method capable of supplying energy stably

Abstract

The invention belongs to the field of oilfield well site energy supply, and discloses an off-grid type oil well energy supply system and method capable of stably supplying energy. The system comprises a photovoltaic power generation device, a wind power generation device, a gas power generation device, an energy storage device, a power distribution device, a production load and energy management device. The production load comprises an oil pumping unit, and the oil pumping unit is electrically connected with the power distribution device and performs reverse power generation during operation. The off-grid type energy supply system provided by the invention does not depend on the mains supply of a large power grid, realizes self-sufficiency of oil well energy supply in a multi-energy complementary mode, integrates multiple energy sources to realize oil well energy supply, fully plays the dominant complementary effect of each energy source, and effectively improves the stability and reliability of oil well energy supply in the energy supply mode. The system and the method of the invention utilize the energy management device to match the energy supply system with the load operation for energy supply, ensure the safety and the reliability of power supply of production facilities such as well site pumping units and the like, and improve the electrification rate and the clean energy utilization rate.

Inventors

• LI HONGBIN
• LU HONGYUAN
• WU DAYU
• YANG WENDE
• HAN NINGNING
• WANG YANTAO
• SUN YANBO
• ZHOU LIFENG
• MEI DONGLIANG
• LIU ZHENNING
• HOU JIANYU
• LIU BING
• RONG JUNJIE

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. A stably powered off-grid oil well energy supply system, comprising: a photovoltaic power generation device; a wind power generation device; a gas power generation device; The energy storage device is used for receiving electric energy generated by the photovoltaic power generation device and the wind power generation device; The power distribution device is electrically connected with the photovoltaic power generation device, the wind power generation device, the gas power generation device and the energy storage device; A production load comprising a pumping unit electrically connected to the power distribution device and generating electricity upside down during operation; The energy management device monitors the power generation power of the photovoltaic power generation device and the wind power generation device and the energy storage state of the energy storage device, and controls the photovoltaic power generation device, the wind power generation device, the gas power generation device and the energy storage device according to the power consumption of the production load so as to realize energy scheduling.
2. 2. The off-grid well energy supply system with stable energy supply according to claim 1, further comprising an electric energy feedback device, wherein the electric energy feedback device is arranged between the pumping unit and the distribution device, and the electric energy feedback device can convert electric energy generated by the pumping unit in the process of reversing power generation in the down stroke and send the converted electric energy back to the electric network.
3. 3. The stably powered off-grid well power system of claim 1 wherein the power distribution device comprises an ac/dc power distribution mechanism comprising a dc bus and an ac bus.
4. 4. The off-grid oil well energy supply system with stable energy supply according to claim 3, wherein the photovoltaic power generation device comprises a fixed photovoltaic power generation device and a mobile photovoltaic power generation device, and electric energy generated by the fixed photovoltaic power generation device and the mobile photovoltaic power generation device is converted by direct current/direct current voltage stabilization and then is connected into the direct current bus.
5. 5. The stably powered off-grid well power system of claim 4 wherein the mobile photovoltaic power generation device is disposed on temporary free land that is not occupied during production in the wellsite but is occupied during servicing.
6. 6. The stably powered off-grid well power system of claim 5 wherein the mobile photovoltaic power generation device is positioned near the wellsite pumping unit.
7. 7. The stably powered off-grid well power system of claim 3 further comprising an air source heat pump device connected to said ac bus.
8. 8. The stably powered off-grid oil well energy supply system of claim 1 wherein the gas power generation device employs a mobile gas generator and generates electricity from associated gas at the well site.
9. 9. The stably powered off-grid well power system of claim 8 wherein the gas power generation device generates electricity in the event of insufficient continuous power output of the wind power generation device and the photovoltaic power generation device or increased power consumption of production loads in the wellsite.
10. 10. The stably powered off-grid oil well energy supply system of claim 8, wherein the pumping unit is equipped with an intelligent intermittent pumping unit 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.
11. 11. The stably powered off-grid well energy system of claim 10, wherein the energy management device is configured to determine whether the power distribution device is capable of providing sufficient power to the pumping unit based on information collected by the intelligent pumping unit, determine whether power demand can be balanced by operation of the intelligent pumping unit if power is insufficient, and activate the gas-powered device if power demand cannot be balanced by the intelligent pumping unit.
12. 12. The stably powered off-grid well power system of claim 1 wherein the energy storage device is selected from at least one of a lithium battery, a compressed air energy storage device.
13. 13. The stably powered off-grid oil well power supply system of claim 12 wherein the lithium battery is a lithium iron phosphate battery with a capacity above 100 kWh.
14. 14. The stably powered off-grid well power system of claim 1 further comprising a centralized control mechanism storing wellsite data and predictive models for predicting wellsite thermal energy, electrical energy trends, the centralized control mechanism being communicatively coupled to the energy management device.
15. 15. The stably powered off-grid well power system of claim 14 wherein the wellsite data comprises data of electrical energy, thermal energy, and pressure, temperature, fluid level downhole at the wellsite.
16. 16. The steady powered off-grid oil well energy supply system according to claim 15, wherein the energy management device is configured to transmit wellsite data to the centralized control mechanism, the centralized control mechanism determining whether electrical and thermal energy of a wellsite needs to be adjusted based on the wellsite data and the predictive model, and if so, sending an adjustment signal to the energy management device, the energy management device adjusting the photovoltaic power generation device, the wind power generation device, the gas power generation device, the energy storage device, and the production load within the wellsite based on the adjustment signal.
17. 17. A method of powering an oil well using the system of any one of claims 1-16, comprising the steps of: Determining whether the power generated by the photovoltaic power generation device and the wind power generation device and the power consumption of the production load meet supply-demand balance or not by using the energy management device; Under the condition that supply and demand balance is met, the power generation power of the photovoltaic power generation device and the wind power generation device and the power consumption power of the production load are adjusted to improve production efficiency; in the case of insufficient power supply, power is supplied by using the energy storage device; and in the condition that the energy storage device is insufficient in electric energy, adjusting the operation of the production load to reduce the power consumption of the production load.
18. 18. The method of claim 17, wherein said adjusting the generated power of said photovoltaic power generation device and said wind power generation device and the power consumption of said production load to increase production efficiency further comprises: determining whether the generated power of the photovoltaic power generation device and the wind power generation device reaches a power upper limit threshold value; When the upper limit threshold is reached, not adjusting the power generated by the photovoltaic power generation device and the wind power generation device; And when the upper limit threshold is not reached, increasing the power generated by the photovoltaic power generation device and the wind power generation device to provide more electric energy for the energy storage device, determining whether the energy storage device reaches an upper electric energy storage limit, if so, operating an air source heat pump to raise the temperature of the oil tank, further determining whether the temperature of the oil tank reaches a top value, and when the temperature of the oil tank reaches the top value, controlling the photovoltaic power generation device and the wind power generation device to discard electricity.
19. 19. The method of claim 18, wherein adjusting operation of the production load to reduce power consumption of the production load in the event of insufficient power in the energy storage device further comprises: comparing the stored electrical energy of the energy storage device with a first threshold value, disabling the air source heat pump if the stored electrical energy is below the first threshold value, and And when the stored electric energy is lower than the first threshold value, further comparing the stored electric energy with a second threshold value, wherein the second threshold value is lower than the first threshold value, and if the stored electric energy is lower than the second threshold value, stopping and operating the pumping unit are adjusted.
20. 20. The method of claim 19, wherein adjusting the shut down and operation of the pumping unit further comprises: And comparing the liquid level, the pressure and the temperature of the oil well with the respective corresponding limit values, and if any one parameter exceeds the limit value, sending an alarm signal to the energy management device, wherein the energy management device starts the gas power generation device based on the alarm signal.

Description

Off-grid oil well energy supply system and method capable of supplying energy stably Technical Field The invention relates to the field of oilfield well site energy supply, in particular to a stable energy supply off-grid type oil well energy supply system. Background The oil field well site takes the exploration, development, production and processing of petroleum, natural gas and other resources as main business, and is an important power source for promoting the development of economy and society. However, with the progress of time and technology, many oil fields in China are gradually advancing to the middle and later stages of development, the ground production system is built, the total energy consumption is still increased, the resource utilization rate is still lower, and the global energy development trend of green low carbon and zero carbon at present is not satisfied. The energy consumption of the oilfield mechanical extraction system mainly takes electric energy and natural gas as main materials, and most of power supply comes from commercial power of a large power grid. The current commercial power mainly uses thermal power, and has the problems of large carbon emission, high energy consumption cost and the like. Natural gas is associated gas of an oil well, and although the power supply cost is low by using the natural gas, the mode still has the problem of high carbon emission. Moreover, as the field progresses to the later stages of development, the well production decays gradually. The current oil field faces the development bottleneck of low yield, low efficiency and high energy consumption. In addition, most of oil fields are built in remote areas, so that the transmission distance is long, the load rate is high, the power transmission loss rate is correspondingly increased, the loss rate can be 1% -5% according to different transmission distances, transmission capacities and transmission voltages, and part of remote well sites are far away from a large power grid, so that the cost for building a power supply line is high, and the investment income is limited. In order to reduce the energy cost and carbon emission of oil areas, some researches propose to build new energy systems at oilfield well sites. The energy system adopts green energy sources such as photovoltaic and wind power, and the like, and utilizes rich idle site resources of well sites to set power generation devices such as photovoltaic and wind power, so that green electricity replacement of clean energy power generation for traditional power grid power supply is realized. The patent CN202309101U discloses an oilfield distributed photovoltaic power generation device, which comprises a plurality of oilfield photovoltaic power generation sub-devices, a common direct current bus and energy conservation measurement and control module, a total system charge-discharge and reversible control module and an energy storage module, wherein the common direct current bus and energy conservation measurement and control module, the total system charge-discharge and reversible control module and the energy storage module are arranged with each sub-device. Each photovoltaic power generation sub-device consists of a photovoltaic array power generation module, a power generation measurement and control module, a frequency conversion and stroke regulation and control module and an inversion energy feedback module. In operation, the electric energy output by each photovoltaic array power generation module is obtained by the common direct current bus system through the corresponding frequency conversion and stroke regulation and control module to be a variable frequency alternating current power supply required by each alternating current load, meanwhile, the electric energy of the load capable of generating power is fed back to the common direct current bus system through inversion to perform energy balance control, and the electric energy is shared and consumed or redundant electric energy is stored in the energy storage module for use when the bus fails. As another example, patent CN201549929U discloses a complementary intelligent system of wind power generation grid of oil field pumping unit, which mainly solves the problem of excessive energy consumption of oil field pumping unit. The system comprises a wind driven generator, a wind driven generator controller, a storage battery and an inverter. The wind driven generator controller rectifies the electric energy generated by the wind driven generator to charge a storage battery, and after the electric energy reaches a starting voltage, the electric energy is inverted through an inverter to supply power to a load of the pumping unit. When the voltage of the storage battery is lower than a set value, the system is automatically switched to a mains supply grid to supply power under the action of the wind driven generator controller until the storage battery is charged again to reach a starting