考虑储层物性变化的SAGD开发蒸汽腔前缘传热研究

doi:10.13809/j.cnki.cn32-1825/te.2023.03.013

摘要/Abstract

摘要：

目前，SAGD（蒸汽辅助重力泄油技术）开发蒸汽腔边缘的热传递研究主要考虑蒸汽与储层的热传导作用，对流传热及受温度影响的储层物性变化则很少被关注，然而，实际生产中两者对传热效果和温度场分布的影响不容忽略。通过质量守恒、能量守恒和数学坐标变换，综合考虑热传导与热对流的传热机理及储层物性随温度变化对传热的影响，创新性地建立了蒸汽腔前缘传热半解析模型，差分求解得到蒸汽腔边缘温度分布和受温度影响下的储层物性分布。结果表明：①研究模型更符合实际，相比Butler模型和Dong模型，精度分别提高了34 %和11 %；②分析储层物性变化情况下对流和传导的相对关系，得出在原油可动区域中对流传热比例是传导传热的3倍以上，热对流起主导作用，但在远离蒸汽腔位置处仍主要以热传导为主；③通过促进水的流动可以扩大对流传热区域，能够有效提高传热效率，对于减少蒸汽需求和提高原油采收率具有重要的指导意义。

关键词: 储层物性变化, 蒸汽腔, 热膨胀, 热对流, 热传导

Abstract:

At present, the researches on the heat transfer of the steam cavity edge in the SAGD production process mainly pay attention to the heat conduction between steam and the reservoir, while little attention has been paid to the convective heat transfer and changes of the reservoir physical properties affected by the temperature. However, the influence of both on the heat transfer effect and temperature field distribution cannot be ignored. By the comprehensive consideration of two heat transfer mechanisms of heat conduction and heat convection, as well as the influence of reservoir physical properties changes on heat transfer, a semi-analytical model is established through the conservation of mass, energy and mathematical coordinate transformation, and the temperature distribution at the edge of the steam chamber and the physical property distribution of the reservoir under the influence of temperature are obtained by differential solution. The results show that: ① the model proposed in this paper is more practical, with an accuracy improvement of 34 % and 11 % compared to the Butler's model and the Dong's models, respectively. ② By analyzing the relative relationship between convection and conduction under the change of reservoir physical properties, it is concluded that the proportion of the conduction heat transfer in the crude oil movable area is more than three times higher than that of the conduction heat transfer, the convection heat transfer accounts for the main proportion in the movable area of crude oil, but at the locations far away from the steam cavity, the conduction and convection work together, and it also gives relevant measures to improve heating efficiency.

Key words: change of reservoir physical properties, steam cavity, thermal expansion, heat convection, heat conduction

中图分类号:

TE34

陈翔宇,李建元,陈宇. 考虑储层物性变化的SAGD开发蒸汽腔前缘传热研究[J]. 油气藏评价与开发, 2023, 13(3): 379-384.

CHEN Xiangyu,LI Jianyuan,CHEN Yu. Heat transfer of steam cavity edge in SAGD process considering reservoir physical property changes[J]. Petroleum Reservoir Evaluation and Development, 2023, 13(3): 379-384.

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