SAGD水平井启动阶段汽腔加热边界预测模型

A prediction model used for the heating boundary of steam chamber in the startup stage of SAGD horizontal well

何小东 张磊 黄勇 杨洪 陈森

HE Xiaodong ZHANG Lei HUANG Yong YANG Hong CHEN Sen

中国石油新疆油田公司工程技术研究院

Engineering Technology Research Institute, PetroChina Xinjiang Oil field Company, Karamay 834000, Xinjiang, China

蒸汽辅助重力泄油（SAGD）技术分为启动和生产两个阶段。量化计算SAGD启动阶段水平段的汽腔发育边界是判断转入生产阶段最佳时机的重要依据。根据SAGD启动过程分析、蒸汽加热地层的热传导方程，并通过引入井下温度衰减测试方法，建立了水平段各测温点的加热半径计算模型。该模型可以用来计算水平段沿程蒸汽加热边界，判断汽腔发育形态。以新疆油田某SAGD水平井井底测温数据为基础，将该模型计算结果与监测数据进行对比分析，发现模型定量计算结果与监测数据的定性判断结果一致。研究结果为SAGD转生产阶段时机的判断与汽腔发育均匀性监测提供了新方法。

Steam assisted gravity drainage (SAGD) technology is divided into stages, i.e., startup stage and production stage. The quantitative calculation of steam chamber development boundary in the horizontal section in the SAGD startup stage is the important basis for discriminating the optimal beginning time of production stage. In this paper, the model used for calculating the heating radius of each temperature measurement point in the horizontal section was established by introducing the downhole temperature attenuation testing method on the basis of the SAGD startup process analysis and the heat conduction equation of steam heating reservoir. This model can be used to calculate the steam heating boundary along the horizontal section and discriminate the development morphology of steam chamber. Then, the bottom-hole temperature measurement data of a certain SAGD horizontal well in Xinjiang Oil field was collected for study. The calculation results by this model were compared with the measured data. It is indicated that the quantitative calculation result by this model is in accordance with the qualitative discrimination result based on the measured data. The research results provide a new method for discriminating the conversion timing of SAGD production stage and monitoring the development homogeneity of steam chambers.

10.13639/j.odpt.2017.05.002