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首页> 外文会议>SPE Heavy Oil Conference >Bitumen Extraction by Expanding Solvent-Steam Assisted Gravity Drainage (ES-SAGD) with Asphaltene Solvents and Non-Solvents
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Bitumen Extraction by Expanding Solvent-Steam Assisted Gravity Drainage (ES-SAGD) with Asphaltene Solvents and Non-Solvents

机译：通过将溶剂 - 蒸汽辅助引力引出（ES-SAGD）与沥青质溶剂和非溶剂萃取沥青提取

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Steam Assisted Gravity Drainage (SAGD) is a proven enhanced oil recovery technique for oil sand extraction. However, the environmental and economic challenges associated with steam generation limit the application of this technology. To address these issues, we investigated the effectiveness of Expanding Solvent SAGD (ES-SAGD) over base SAGD on a bitumen sample (8.8 °API). Experimental studies are conducted with a two-dimensional physical model. Different strategies for solvent injection are tested (co-injection and cyclic injection) to examine the deposition of polar fractions of the bitumen on porous media or producing polar fractions with non-polar ones. To investigate the level of oil upgrading while toluene is used as asphaltene soluble solvent, n-hexane was selected as asphaltene insoluble. Steam chamber development is monitored with temperature profiles from 47 separate positions. Steam oil ratios, solvent oil ratios, and the level of oil upgrading in terms of viscosity reduction and API gravity improvement are evaluated together. Environmental footprints of SAGD with ES-SAGD are discussed in terms of solvent toxicity, total produced greenhouse gases, and asphaltene precipitation with FTIR analysis on postmortem samples. Furthermore, the energy intensity of the processes is assessed by considering steam generation and solvent costs. This study reveals that co-injection of hydrocarbon solvents with steam enhances the steam chamber development with higher oil production rate. Moreover, ES-SAGD results in recovery of more upgraded oil and has less environment impact. We observe that the selection of the solvent type and injection strategy are the most crucial parameters for the design of hybrid SAGD process and solvent cost can be minimized by using the recycled solvent for continuous injection of solvents. High energy consumption for steam generation during SAGD process can be reduced by co-injection with steam proper solvent type at proper injection strategy. This experimental study reveals that ES-SAGD process has environmental and economic benefits over base SAGD. However, some solvents can cause undesirable effects due to the asphaltene destabilization and precipitation in production or transportation lines. Results of this work can be used to better address solvent interaction with polar components during SAGD.
机译：蒸汽辅助重力排水（SAGD）是一种探明的油砂提取增强的采油技术。然而，与蒸汽发生相关的环境和经济挑战限制了这项技术的应用。为了解决这些问题，我们研究了在沥青样品（8.8°API）上扩张溶剂SAGD（ES-SAGD）对碱纱布的有效性。实验研究用二维物理模型进行。测试（共注射和环状注射）的不同策略，以检查多孔介质上的沥青的极性分数或产生具有非极性的极性级分。为了研究油升级水平，同时使用甲苯作为沥青质可溶性溶剂，选择正己烷作为沥青质不溶于溶胶。通过47个独立位置的温度剖面监测蒸汽室开发。在蒸汽油比，溶剂油比和粘度减少和API重力改善方面的升级水平进行了评价。在溶剂毒性，总产生的温室气体和沥青质沉淀到淘汰后的疗法分析，讨论了与ES-SAGD的环境足迹。此外，通过考虑蒸汽产生和溶剂成本，评估过程的能量强度。该研究表明，用蒸汽的烃溶剂共注出，提高了蒸汽室发育，具有较高的石油产量。此外，ES-SAGD导致恢复更升级的油，环境影响较差。我们观察到溶剂型和注射策略的选择是最重要的参数，用于设计杂交SAGD过程，通过使用再循环溶剂来连续注射溶剂，可以最小化溶剂成本。通过在适当的注射策略中使用蒸汽适当的溶剂类型共注入，可以减少SAGD过程中蒸汽发生的高能消耗。该实验研究表明，ES-SAGD过程具有对基础SAGD的环境和经济效益。然而，由于生产或运输线中的沥青质不稳定和沉淀，一些溶剂可能导致不良影响。该工作的结果可用于更好地在SAGD期间与极性成分进行地应地解决溶剂相互作用。

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