Application of hot fluid circulation to ultra-deep well

In view of the ultra-deep feature of TaHe heavy oil reservoir, traditional hot fluid circulation technique was improved, in which heating point moved upward from bottom hole so that hot fluid could heat part of crude oil. This paper develops the mathematical model of wellbore temperature distribution and solves it. By analyzing sensitivity of the parameters influencing wellbore temperature, optimal operation parameters of hot fluid circulation are obtained. Field practice shows that the new technology can effectively solve the problems existed in hot fluid circulation technique used in ultra-deep heavy oil well, with effective utilization of energy and preferable heating effect.