双水平井SAGD循环预热连通判断新解析模型

A New Analytical Model of Heat Communication Judgment During Heat Circulation Phase of Dual-horizontal SAGD

注蒸汽循环预热对转SAGD生产阶段蒸汽腔的上升速度、SAGD上产速度、水平段蒸汽腔的发育程度与动用率、以及SAGD最终采收率等均有重要影响。而SAGD注采井水平段之间的储层温度是评判预热连通是否达到要求、以及合理转SAGD生产的关键参数。针对前人传热解析模型未分别考虑实际储层多孔介质中岩石、原油、地层水传热与热扩散性能等问题,建立了考虑油水岩石的多介质多相流体综合传热解析新模型,并以国内某油区典型SAGD井组为例,利用井下测温数据、油水岩石热物性参数等为数据,进行了SAGD注蒸汽循环预热阶段注采井水平段之间温度变化测算,并与数值模拟计算结果进行了对比,计算结果表明,提出的新型解析模型与数值模拟结果符合率达到了95%以上,可方便快捷对预热连通情况进行速判,对现场SAGD成功实施具有重要意义。

The effect of heat circulation by steam injection is of a great importance to the steam chamber growth rate, SAGD ramp-up rate, steam chamber dimension along horizontal section, tapping efficiency and ultimate recovery factor for SAGD production. While the temperature of the formation between horizontal sections of injector and producer in a SAGD wellpair is the crucial parameter to judge whether heat communication between injector and producer is enough or whether it is rational to convert from circulation to SAGD production phase. According to the problems that the previous analytical model only considers the thermal properties of the formation rock, the new analytical model of calculating heat communication including the effect of formation rock, oil and water is established. The field data of well configuration and thermal properties of formation rock, oil and water from a SAGD production area in China is taken as an example to calculate the temperature change and distribution during SAGD circulation phase and the results are compared with those from previous model and numerical history match. The calculation results show that the analytical results from the model proposed in this paper have quite good agreement （〉95%） with the numerical simulation results, which justifies its feasibility and accuracy. The heat communication during SAGD circulation phase can be determined timely by using this model and it has a significance to guide the SAGD operation during production phase successfully.