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A numerical model for predicting distributions of pressure and temperature of superheated steam in multi-point injection horizontal wells
International Journal of Heat and Mass Transfer ( IF 5.2 ) Pub Date : 2018-06-01 , DOI: 10.1016/j.ijheatmasstransfer.2018.01.017
Fengrui Sun , Yuedong Yao , Xiangfang Li , Guozhen Li , Zheng Sun

Abstract In order to make full use of the advantages of superheated steam (SHS), SHS injection in multi-point injection wells (MPIW) is proposed in this paper. Firstly, a mathematical model comprised of SHS flow model in inner tubing (IT) or long tubing (LT) and annulus, transient heat transfer model in oil layer is established. Secondly, type curves of SHS flow in MPIW is obtained by finite difference method on space and the iteration technique. Then, the effect of injection temperature on distributions of thermophysical properties of SHS in MPIW is discussed in detail. Results show that: (a) When the heat exchange between IT and annulus is taken into consideration. SHS temperature in IT has a decrease while SHS temperature in annulus has an increase. (b) With the help of MPIW, heating effect at both heel and toe points of the horizontal wellbores can be enhanced. (c) While the increase of SHS temperature certainly benefits the formation heating effect through the increase of both SHS temperature and superheat degree, the following decrease of SHS pressure in annulus will lead to the decrease of SHS absorption rate. This paper unravels some intrinsic flow characteristics of SHS in MPIW, which has a significant impact on the optimization of SHS injection parameters and analysis of heat transfer law in MPIW.

中文翻译:

一种预测多点注入水平井过热蒸汽压力和温度分布的数值模型

摘要 为了充分发挥过热蒸汽(SHS)的优势,提出了多点注入井(MPIW)中的过热蒸汽注入。首先,建立了由内油管(IT)或长油管(LT)和环空的SHS流动模型组成的数学模型,建立了油层瞬态传热模型。其次,利用空间有限差分法和迭代技术得到MPIW中SHS流的类型曲线。然后,详细讨论了注射温度对 MPIW 中 SHS 热物理特性分布的影响。结果表明: (a) 当考虑 IT 与环空之间的热交换时。IT 中的 SHS 温度降低,而环形空间中的 SHS 温度升高。(b) 在 MPIW 的帮助下,可以提高水平井眼跟、趾两个点的加热效果。(c) 虽然 SHS 温度的升高通过 SHS 温度和过热度的增加肯定有利于地层加热效应,但随后环空 SHS 压力的降低将导致 SHS 吸收率的降低。本文揭示了 MPIW 中 SHS 的一些固有流动特性,这对 MPIW 中 SHS 注入参数的优化和传热规律的分析具有重要影响。
更新日期:2018-06-01
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