Research on Two-Phase Closed Thermosyphon to Improve Fluid Temperature Distribution in Wellbores

摘要

A two-phase closed thermosyphon (TPCT) is introduced to improve fluid temperature distribution in wellbores by utilizing its characteristics of efficient heat transfer. Laboratory experiments show that TPCT in wellbores can heat the upper fluid in wellbores by absorbing the surplus energy of the lower fluid in the wellbore, and no extra energy is consumed. The roles of TPCT are affected by several factors. The type of working media needs to match with the inlet temperature of simulation oil. A filling ratio of 15% is optimal for different TPCT wellbores in experiments. With higher vacuum degree in the TPCT cavity, TPCT has a better role. With higher simulation oil flow rate, the role of TPCT is worse.