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Assessment of energy efficiency and solvent retention inside steam chamber of steam- and solvent-assisted gravity drainage process

机译：评估蒸汽和溶剂辅助重力排水过程中蒸汽室内的能量效率和溶剂保留

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摘要

Deeply-buried and high-bitumen-content crude oil is one of the most important energy resources. Currently, Steam- and Solvent-Assisted Gravity Drainage (SSAGD) is an attractive, but a high-cost and high-carbon-emitting method for exploiting this type of resource. In order to evaluate the greenhouse gas (GHG) emission and economic performance of SSAGD, it is critical to predict the energy efficiency and solvent retention in the steam chamber. However, the fluid property profiles inside the steam chamber, which are directly related to energy efficiency and solvent retention, have been rarely investigated. In this work, a semi-analytical model is developed for examining the property distributions within the steam chamber, considering the complex interaction of energy and mass transfer along with the effects of phase behavior. Subsequently, the solvent retention and energy-utilization/-saving efficiency are carefully analyzed on the basis of the calculated property profiles inside the steam chamber. The proposed method is mostly based on analytical relationships and is free from certain simplifications that may affect the calculations of energy efficiency and solvent retention in the SSAGD process. Furthermore, the optimal solvent type and injection pressure obtained with the model can reduce the GHG emission and improve the economic benefits of future SSAGD projects.
机译：深埋和高沥青含量的原油是最重要的能源之一。当前，蒸汽和溶剂辅助重力排水法（SSAGD）是一种有吸引力的方法，但它是一种开发此类资源的高成本，高碳排放的方法。为了评估SSAGD的温室气体（GHG）排放和经济表现，预测蒸汽室中的能量效率和溶剂保留至关重要。然而，很少研究与能量效率和溶剂保留直接相关的蒸汽室内的流体特性曲线。在这项工作中，开发了一个半分析模型来检查蒸汽室内的特性分布，同时考虑了能量和质量传递的复杂相互作用以及相行为的影响。随后，基于计算出的蒸汽室内的特性曲线，仔细分析溶剂的保留和能量的利用/节约效率。所提出的方法主要基于分析关系，并且没有某些可能会影响SSAGD工艺中能效和溶剂保留率计算的简化。此外，通过该模型获得的最佳溶剂类型和注入压力可以减少温室气体排放并提高未来SSAGD项目的经济效益。

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