基于焖井温降模型的蒸汽吞吐井吸汽剖面解析

Analysis on the steam absorption profile of steam huff and puff well based on soaking temperature drop model

孙新 潘勇 彭威 段胜男 芦志伟 游红娟

SUN Xin PAN Yong PENG Wei DUAN Shengna LU Zhiwei YOU Hongjuan

长江大学石油工程学院 中国石油新疆油田分公司工程技术研究院 清华大学核能与新能源技术研究院

College of Petroleum Engineering, Yangtze University, Wuhan 430100, Hubei, China Engineering Technology Research Institute, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China

蒸汽吞吐是稠油热采开发的一项关键技术，定量计算蒸汽腔空间分布和动态变化对开采过程具有重要意义。为了获得蒸汽腔空间分布，基于传热学理论分析，建立了焖井温降模型，用于解析蒸汽吞吐井吸汽剖面，并结合最小二乘算法，对蒸汽腔初始的大小和分布进行了估计。与实际井采集数据比较结果表明，计算值与实际测量值吻合较好，应用解释模型可以详细了解热采过程中蒸汽腔的大小和分布，进而为合理确定SAGD过程总注汽量、注汽时间等参数提供参考。该模型的参数敏感性分析表明，地层热扩散系数、厚度、初始温度和蒸汽温度对计算结果影响较大，在实际应用中需要重点关注这些参数的取值。

Cyclic steam stimulation is one key technology for thermal production of heavy oil, and the quantitative calculation of spatial distribution and dynamic change of steam chamber is of great significance to the oil production. In order to figure out the spatial distribution of steam chamber, a soaking temperature drop model was established based on the theoretical analysis of thermal conduction to analyze the steam absorption profile of steam huff and puff well. Then, the initial size and distribution of steam chamber were calculated by means of least square algorithm. Finally, the calculation result was compared with the data acquired from the actual well. It is shown that the calculation result is in accordance with the measurement value, indicating the feasibility and reliability of this interpretation model. By virtue of this model, the size and distribution of steam chamber in the process of thermal production can be understood in detail, so as to provide the reference for the SAGD parameters, e.g., total steam injection and steam injection time. In addition, the parameter sensitivity analysis on this model shows that thermal diffusion coefficient, thickness, initial temperature and steam temperature have more effects on the calculation results, so their valuing in actual application shall be focused.

10.13639/j.odpt.2018.03.013