Technical Research on Geothermal and Multi-energy Complementary Systems in a Certain Area of Daqing Oilfield

To promote the large-scale application of renewable clean energy in Daqing Oilfield and facilitate energy transition and green development, this study takes a specific area in Daqing Oilfield as an example. It systematically analyzes the spatiotemporal distribution characteristics of geothermal energy alongside regional wind and solar resources, and construct a collaborative energy supply scheme integrating medium-deep geothermal energy with wind-solar-gas-storage multi-energy complementarity. The results show that: 1) The average geothermal gradient in the study area is 4.3 ℃/100m, the formation temperature at 3600 m is about 152 ℃, and the distribution of thermal reservoirs is stable. 2) The annual average wind speed is 3.8 m/s with 122.2 effective power generation days, while horizontal plane solar radiation totals 5163.7 MJ/m2 corresponding to 57 effective generation days annually. 3) The geothermal energy extraction adopts an U-shaped closed design method, with a vertical depth is 2850 m. The thermal conductivity extraction layers is 2.27–2.35 W/(m K) and geothermal gradient is 4.3 ℃/100 m, the predicted formation temperature is 128 ℃, and the predicted rock thermal resources amount to 6.09 × 108 GJ. After implementation, the annual saving of standard coal is 4393.7t, and the annual emission reduction of CO2 is 6,415.8 t. 4) A multi-energy complementary power supply system comprising wind, photovoltaic, gas, and energy storage modules is constructed based on regional energy demands. After evaluating five complementary schemes through comprehensive analysis of benefits, management, and energy stability, the wind-solar-gas-storage integration was prioritized. This optimal solution can annually supply 700 × 104 kWh clean electricity while saving 2093 ton of standard coal annually and reducing CO2 emissions by 5950 t. The research outcomes demonstrate significant referential value for constructing a clean, low-carbon, safe, and efficient energy system in Daqing Oilfield.