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ES-SAGD Relative Permeability as a Function of Temperature and Solvent Concentrations

机译:ES-SAGD相对渗透性作为温度和溶剂浓度的函数

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Relative permeability plays a significant role in predicting oil rate and ultimate oil recovery factor. The literature reveals that same set of relative permeability is often used to predict the ES-SAGD performance regardless of not only the downhole operating temperature but also the injected solvent concentration. This can lead to significant errors when predicting the ES-SAGD performance and its economical feasibility. In paper SPE-180713-MS, SAGD relative permeability was presented as a function of temperature. In this paper, a series of realistic ES-SAGD relative permeability curves were developed based on experimental work combined with simulation studies. A typical Athabasca oil and sand were used to obtain the experimental data and construct relative permeabilities using unsteady-state method. First residual oil saturations were determined in presence of hot water and steam flooding under SAGD condition at a given temperature. Following that, a typical n-alkane (n-heaxane) solvent was co-injected with steam at different concentrations varying from one to 25 weight percent of the injected steam while the operating temperature was kept constant. The produced oil and water volumes were collected and measured during the hot water, steam injection, and solvent co-injection experiments. The data were utilized to construct the relative permeability curves at a given operating temperature (200 °C) and various solvent concentrations. Finally, a series of reservoir simulations were performed to history match the lab experiments and examine the accuracy of inferred relative permeability curves.
机译:相对渗透率在预测油速和最终的储存因子方面发挥着重要作用。文献揭示了相同的相对渗透性,通常用于预测ES-SAGD性能,而不仅是井下工作温度,而且是注射的溶剂浓度。这可能导致预测ES-SAGD性能及其经济可行性时的重大错误。在纸张SPE-180713-MS中,将SAGD相对渗透率作为温度的函数呈现。本文基于实验性与仿真研究相结合,开发了一系列现实的ES-SAGD相对渗透曲线。使用典型的Athabasca油和砂来获得实验数据并使用非稳态方法构建相对渗透性。在给定温度下在SAGD条件下,在热水和蒸汽泛溶液存在下确定第一种残留的油饱和。在此之后,在不同浓度下与蒸汽共注射典型的N-烷烃(N-烷烃)溶剂,在0至25重量%的注射蒸汽中,同时操作温度保持恒定。在热水,蒸汽注入和溶剂共注入实验期间收集并测量所生产的油和水量。利用数据在给定的工作温度(200℃)和各种溶剂浓度下构建相对渗透曲线。最后,对历史进行了一系列储层模拟,符合实验室实验并检查推断相对渗透曲线的准确性。

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