Application of FGI intelligent energy storage system in oilfield "oil to electricity" project
1.Background
In recent years, the oilfield attaches great importance to green and low-carbon development, increases the introduction and transformation of electric drilling RIGS, the application scale of electric drilling RIGS has increased significantly, and the construction benefits have become increasingly apparent, providing strong support for the company's clean production and green development. From 2018 to 2023, the proportion of inland grid electricity in oilfield countries increased from 24.56% to 62.26%, showing a continuous upward trend, and 2024-2025 oilfield leaders put forward higher requirements for the utilization rate of grid electricity. In 2024, the basic goal of the utilization rate of the eastern onshore network electricity is not less than 80%, the struggle goal is 90%, and the offshore network electric drilling has achieved a breakthrough.
Most of the oilfield power grids were built in the 1970s and 1980s, and there were problems such as aging lines and heavy loads, which limited the use of large-scale electric network RIGS and became the bottleneck to improve the utilization rate of electric network RIGS. Some well locations are remote, the power grid can not be fully covered, even if the line load can meet the needs, but the line distance is long, high investment.
There are serious power quality problems in oilfield power grid, and the reasons for the instability of power grid are as follows:
The power supply capacity of the grid is small, and the power supply radius is insufficient, which can not meet the use of high-power load.
The line distance is far, the line equivalent impedance is large, and the voltage drop caused by the same load is large.
The load changes quickly, the impact load is more, the high-power impact equipment such as the winch and the mud pump will affect the stability of the voltage, which will cause the voltage fluctuation of the electric network drill.
2.Project overview
In order to solve the above problems, FGI has developed a customized energy storage solution for the application scenario of oil to power, comprehensively evaluating the stationary load power and impact power of the wellhead equipment. The overall topology is as follows:
The AC side of PCS is directly connected in parallel, and the DC side is connected to different piles of batteries, and the PCS can withstand the impact of large motor startup or transformer input when running off-grid at the same time. In normal operation, only half of the load is powered, and when the battery battery connected to it is low, the other half is seamlessly switched to the load power supply. The battery warehouse is charged to the nearest substation, and the cycle is repeated.
3.Characteristic of project
The first large-scale oil to electricity project in China, the implementation of the project, solved the oil well electricity pain point. In addition, FGIPCS also has voltage fluctuation suppression, reactive power compensation, harmonic control, three-phase unbalance correction, instantaneous capacity increase, winch braking energy recovery and other functions.
The load power distribution in the whole operation process is determined by the sag characteristic preset by PCS, which is basically in a state of equal distribution. The power fluctuation during dynamic load cutting is within the allowable range of PCS, which is a non-disruptive switching for on-site load.
FGI1000V, 1500V low voltage energy storage system, power, capacity configuration flexible; 6kV-35kV high-voltage direct-hanging stage fed energy system, with a single large capacity, single cluster control, no boost transformer, high efficiency, high-quality output waveform, automatic bypass and other advantages; 125kW/261kWh industrial and commercial energy storage system, All In One design, small footprint, easy construction, flexible expansion. Serialized energy storage products are widely used in new energy generation distribution and storage on the power supply side, medium and large energy storage power stations on the power grid side, power supply station areas on the user side, industrial parks and other scenarios, and cooperate to build an interconnected "energy router".
The above products have resonance suppression, high and low voltage crossing, primary frequency modulation, inertia response, black start, network control and other functions. It is worth mentioning that for scenarios such as coal mine emergency power supply, island microgrid and oil to electricity, FGI has developed large-scale PCS off-grid parallel technology, which can perfectly cope with complex conditions such as impact loads and non-linear loads.
