Abstract: In the process of lifting heavy oil in the wellbore as well as gathering and transporting on the ground, it is necessary to equip the viscosity reduction technologies such as thin oil mixing technology in the annulus, electric heating technology of hollow rods, and heating technology of gas furnaces, which leads to high production costs of heavy oil. According to the current status of new viscosity reduction technologies for heavy oil at home and abroad, after multiple field tests and analysis of cold cracking technology with high energy nanowave for heavy oil, it is confirmed that the technology has a significant effect on upgrading and visbreaking for heavy oil. After circulating treatment of crude oil with the technology, the maximum viscosity reduction rate was 81.7%, the maximum viscosity reduction rate of single treatment is 43.7%, the initial boiling point is reduced from 105 ℃ to 81 ℃, and the total fraction content was increased by 5.7% within 330 ℃, which can convert the heavy components into light components in the crude oil. The technology has a great reference significance for cost reduction and efficiency enhancement of heavy oil reservoirs.

Key words: heavy oil, high-energy nanowave, cold cracking, upgrading and visbreaking, field test, Liaohe Oilfield