注蒸汽井温度场分析计算设计原理

ANALYSIS AND CALCULATION METHOD OF TEMPERATURE FIELD OF STEAM INJECTION WELL

利用汽液两相流理论和传热学原理分别建立了基本符合现场实际的注蒸汽井筒（包括井筒外部受热地层）的温度场分布模型及井筒内部的蒸汽流动模型，并将这两种模型藕合在一起编制了相应的温度场分布分析计算软件ISTAP。为了得到精确性较高的注汽过程蒸汽流动参数和温度分布，模型不仅考虑了井下封隔器和填充绝热材料的隔热管的使用及影响，还采用了更为合理的井底传热边界条件，并在瞬态地层温度场的分析中使用了边界适应性较好、计算精度较高的步进积分有限单元法。不仅给出了编程的计算原理及计算流程，还提出了一些有助于提高井筒温度场计算精度的处理技巧，使计算软件ISTAP有更好的实用性。

This paper presents the temperaure field distribution model and wellbore steam flow model of steam injection well applying gas-liquid two-phase flowing theory and heat conduction principal,and then introduces the relevant calculation software for temperature field distribution. In order to obtain the accurate steam flowing parameters and temperature field distribution during steam injection, two models consider the effect of downhole packer and insulated tubing,and use the more reasonable bottom hole heat transfer boundary conditions. The step integration finite element method,which has advantages of good boundary suitability and high calculating precision,is used in analysis of transient formation temperature field. This paper gives an introduction on computing theory and method,and presents the skills that conduce to increase calculating precision, The software (ISTAP) has good practicality.