In the process of crude oil gathering and transportation,the use of gas or electric energy at the wellhead for its heating and viscosity reduction is prone to cause a large amount of energy consumption and environmental pollution.Solar photovoltaic technology is an efficient and clean new energy technology coupling this technology with thermal storage technology can circumvent the shortcomings of solar energy instability,meet the needs of crude oil viscosity reduction and fixed heating,reduce the consumption of electric energy,and contribute to the carbon peak and carbon neutrality goal.A wellhead crude oil heating system based on thermal energy storage device (TES) and flat-plate solar collector (FPC) is studied,and FPC and crude oil heater in the system are designed and selected.Taking Shengli oilfield as the application scenario of the system,we analyzed and calculated the solar irradiation resources and the heating demand of crude oil at the wellheads in the winter half year (October to March),and reasonably configured the FPC with a heat collection area of 152 m2 and the 17~20 m3 hot and cold water tanks,and gave the operation scheme of the system under different irradiation amounts.The results show that the system can warm up the oilfield wellhead extractive fluid by 25 ℃,work continuously for 24 h per day,reduce carbon dioxide emission by 54.25 t in winter and half a year,and save operation cost by 53 000 yuan,which has good energy-saving and emission reduction benefits and economic benefits.
