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Experimental and numerical study of solvent optimization during horizontal-well solvent-enhanced steam flooding in thin heavy-oil reservoirs

机译：稀稠油油藏水平井增溶剂蒸汽驱中溶剂优化实验与数值研究

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As a major technique for enhancing heavy-oil recovery, steam flooding has been used successfully at large scales around the world. Long-term indoor experiments and field trials, however, have revealed problems, such as heat loss to the overburden and a limited steam zone for steam flooding in thin heavy-oil reservoirs, which severely limit the thermal efficiency of the steam and the economic benefits of the reservoirs. Therefore, we established a set of two-dimensional sandpack models to study the steam chamber expansion characteristics of the horizontalwell solvent-enhanced steam flooding (HW-SESF) of different solvents and its influence on production performance. We established a numerical model based on the experimental parameters to simulate the solvent migration in the steam chamber and its effect on temperature, viscosity, and oil saturation profile. The results demonstrate that, compared with steam flooding, the HW-SESF strategy can effectively reduce the oil viscosity both at the front and inside the steam chamber and improve the steam-injection capability (the stronger the steam-injection capability is, the easier the steam can be injected into the model) of the horizontal injection well, which enhances displacement efficiency and enlarges the swept area of the steam chamber. For HW-SESF of light solvents, the displacement efficiency at the low water-cut production was high, and water cut increased rapidly as the steam front reached the production well. For HW-SESF of medium solvents, the period of stabilized production was long, and the recovery ratio was the highest compared with other solvents. For HW-SESF of heavy solvents, the peak oil production rate was high, and the oil production rate dropped quickly. Therefore, the HW-SESF strategy reduced the heavy-oil viscosity more effectively than conventional steam flooding, and thus the zone of the steam chamber was enlarged and the recovery ratio enhanced. Compared with light and heavy solvents, medium solvents can achieve the best results for steam chamber optimization and the highest recovery ratio; thus, it is considered the most effective method to exploit thin heavy-oil reservoirs.
机译：作为提高稠油采收率的一项主要技术，蒸汽驱已在世界范围内得到了成功的大规模应用。但是，长期的室内实验和现场试验已经发现了问题，例如上覆层的热损失和稀薄的稠油油藏中蒸汽驱的受限蒸汽区域，这严重限制了蒸汽的热效率和经济效益。的水库。因此，我们建立了一套二维沙堆模型，以研究不同溶剂的水平井溶剂增强蒸汽驱（HW-SESF）的蒸汽室膨胀特性及其对生产性能的影响。我们基于实验参数建立了一个数值模型，以模拟溶剂在蒸汽室内的迁移及其对温度，粘度和油饱和度分布的影响。结果表明，与蒸汽驱相比，HW-SESF策略可以有效降低蒸汽腔室内部和内部的油粘度并提高注蒸汽能力（注蒸汽能力越强，越容易可以将蒸汽注入水平注入井的模型中，从而提高驱替效率并扩大蒸汽室的扫掠面积。对于轻质溶剂的HW-SESF，低含水率生产的驱替效率很高，并且随着蒸汽前沿到达生产井，含水率迅速增加。对于中等溶剂的HW-SESF，稳定生产的时间较长，并且与其他溶剂相比，回收率最高。对于重溶剂的HW-SESF，峰值产油率高，而产油率迅速下降。因此，HW-SESF策略比常规蒸汽驱更有效地降低了重油粘度，因此扩大了蒸汽室的区域并提高了回收率。与轻质和重质溶剂相比，中质溶剂可以实现最佳的蒸汽室优化效果和最高的回收率。因此，它被认为是开采稀稠油藏的最有效方法。

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