Abstract：

　　Thermal transmission inside a concentric dual-tubing well (CDTW) with superheated multi-components thermal fluid (SMTF) injection causes a rapid change of temperature and degree of superheating in each tube, which is different from saturated steam injection in CDTW. With consideration of the heat transmission between the integral joint tubing (IJT) and the annulis, a mathematical model is established based on mass, energy and momentum conservation equations. Type curves of superheated multi-components thermal fluid flow in the IJT and annulis are obtained by using a finite difference method and an iteration technique. Then, the predicted results from the model are compared with field data. The results show that the model is applicable to predict thermophysical properties of SMTF in CDTW with different injection parameters. Besides, the model is useful to optimize injection parameters during offshore steam-assisted gravity drainage (SAGD) and cyclic steam stimulation (CSS) processes. A small temperature difference between the IJT and annulis will lead to a large amount of heat flow, which causes a rapid change of temperature and degree of superheating in the CDTW. The flow of seawater has a significant influence on the wellbore heat loss rate. Both the temperature and superheating degree decrease with an increasing content of non-condensing gas.

Key words： offshore heavy oil recovery concentric dual-tubing well superheated multi-components thermal fluid thermophysical properties distribution turbulent flow of seawater

Received： 09 December 2016

Corresponding Authors：姚约东, yaoyuedong@163.com

Cite this article：SUN Fengrui,YAO Yuedong,LI Xiangfang等. Numerical simulation of superheated multi-components thermal fluid flow in offshore concentric dual-tubing wells[J]. Petroleum Science Bulletin, 2017, 2(3): 377-389.

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