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SAGD是开采超稠油的有效商业化手段,准确高效地预测SAGD循环预热阶段的储层温度是SAGD设计的重要内容之一。根据矿场实际生产条件,综合考虑了沿水平井方向和径向方向的热传导以及水平井部分深入储层的实际生产特点,建立了三维热传导物理模型,并通过无因次化、Laplace变换、分离变量法及Stehfest数值反演等手段进行了详细求解。模型所得结果与CMG软件计算结果吻合程度较高,验证了模型的准确性。最后分析无因次加热温度与无因次加热时间和无因次加热量的关系,得出径向距离越小、所需加热时间越短,后期所需加热量越多;径向距离越大、开始升温越晚,所需热量越大的结论。所得图版可用于预测相应温度下所需的加热时间和所需的总加热量,为SAGD循环设计提供依据。
SAGD is an effective means of commercialization of ultra-heavy oil. Accurate and efficient prediction of reservoir temperature during SAGD cycle preheating is one of the important aspects of SAGD design. According to the actual production conditions of the mine, considering the heat conduction in the direction of horizontal well and the radial direction and the actual production characteristics of deep reservoir in the horizontal well, a three-dimensional heat conduction physical model was established and analyzed by dimensionless, Laplace transform and separation Variable method and Stehfest numerical inversion and other means were solved in detail. The results obtained by the model are in good agreement with those calculated by CMG software, which verifies the accuracy of the model. Finally, the relationship between non-dimensional heating temperature and non-dimensional heating time and dimensionless heating is analyzed. The results show that the smaller the radial distance is, the shorter the heating time is, the more heating is needed later. The larger the radial distance , The later the start of the heating, the greater the required heat. The resulting plate can be used to predict the required heating time at the corresponding temperature and the total amount of heat required to provide a basis for SAGD cycle design.