Two-Phase Interference Well Testing Interpretation Method for Polymer Flooding Multilayer Reservoir

Peng Li, Yang Zeng, Engao Tang, Zhijie Wei, Shiqing Cheng
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Abstract

The current research on interference well test technology is based on water flooding reservoir, but the analysis method of interference well test in polymer flooding reservoir has not been reported, which leads to unclear understanding of the physical property changes between wells in polymer flooding reservoir. Considering the characteristics of polymer flow, a two-phase interference well test model of polymer flooding multi-layer reservoir is established. The pressure, water saturation and polymer concentration are all implicitly solved to improve the stability of the numerical solution, and the typical curve is drawn. The results show that: the water phase viscosity is greater during the polymer flooding process, the pressure fluctuation of the active well is later, which affects the observation well, and the pressure fluctuation received by the observation well is greater. The results show that the interference well test curve of polymer flooding is farther to the right than that of water flooding in the early stage and higher than that of water flooding in the middle and late stage. The application example shows that coincidence rate with commercial software well test interpretation is over 90% when the model is degenerated to conventional water flooding, which proves the accuracy of polymer flooding interference well test model, and provides technical support for the improvement of well test method of polymer flooding reservoir.
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聚合物驱多层油藏两相干涉试井解释方法
目前对干涉试井技术的研究是基于水驱油藏,而聚合物驱油藏干涉试井分析方法尚未见报道,导致对聚合物驱油藏井间物性变化认识不清。考虑聚合物渗流的特点,建立了聚合物驱多层油藏两相干涉试井模型。为了提高数值解的稳定性,对压力、含水饱和度和聚合物浓度进行了隐式求解,并绘制了典型曲线。结果表明:聚合物驱过程中水相粘度较大,活动井压力波动较晚,影响观察井,观察井接收到的压力波动较大;结果表明:聚合物驱干涉试井曲线早期比水驱更靠右,中后期比水驱更靠右;应用实例表明,当模型退化为常规水驱时,与商业软件试井解释符合率达90%以上,证明了聚合物驱干扰试井模型的准确性,为改进聚合物驱油藏试井方法提供了技术支持。
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