• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Fuel >Solvent-dependent recovery characteristic and asphaltene deposition during solvent extraction of heavy oil
【24h】

Solvent-dependent recovery characteristic and asphaltene deposition during solvent extraction of heavy oil

机译：重油溶剂萃取过程中溶剂依赖性的采收特性和沥青质沉积

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Most traditional recovery methods for heavy oil, such as thermal recovery processes, are energy consuming and greenhouse gas emission is intense. Non-thermal based solvent extraction methods are attractive because they require much less heat, no water and the produced heavy oil has low viscosity even at surface conditions, making it easier to transport. However, heavy oil recovery by solvent occurs mainly at the moving solvent front which is only a few millimetres width. It is thus challenging for it to be modelled in reservoir scale and leaves a large uncertainty regarding the recovery factor prediction. For any reliable scaling up, the fundamental details of the extraction in millimetre range down to the pore scale need to be understood. In this study, we use a 2D micromodel operated at reservoir pressure and temperature conditions, in order to analyse the extraction processes of bitumen by solvent. Two different solvents, pentane and propane, which are both considered as field-relevant candidates, are selected for comparison and toluene is selected as a fully miscible reference case. By imaging both the displacement pattern on a larger scale of 5 cm and, simultaneously, the details of the flow processes at pore scale, it was observed that both pentane and propane precipitate asphaltenes. But in the case of pentane, the precipitated asphaltenes are solid which significantly reduce the permeability thus resulting in plugging. The result from flow simulation confirmed the influence of formation plugging on the flow and diffusion process. In the case of propane, the precipitated asphaltenic phase remains liquid, hence mobile, which leads to capillary trapping. Consequently, the recovery factor for propane is similar to 15% higher than for pentane and more stable. In general, this study suggests that heavy oil recovery using solvent is a dynamic process where the pore scale phase characteristic of asphaltene has a strong influence both on the transport of fresh solvent and the production of dissolved crude components. These differences between the solvent are key and should be included in field scale estimations.
机译：大多数传统的重油回收方法（例如热回收工艺）都非常耗能，并且温室气体排放量很大。非热基溶剂萃取方法之所以具有吸引力，是因为它们所需的热量少得多，不需要水，而且即使在表面条件下，所产生的重油也具有较低的粘度，从而使其易于运输。然而，通过溶剂进行的重油回收主要发生在仅几毫米宽的移动溶剂前沿。因此，以油藏规模进行建模具有挑战性，并且在采收率预测方面留下了很大的不确定性。对于任何可靠的按比例放大，都需要了解从毫米级到孔径的提取的基本细节。在这项研究中，我们使用在储层压力和温度条件下运行的二维微模型，以分析溶剂萃取沥青的过程。选择两种均被认为是与现场相关的候选物的戊烷和丙烷作为比较溶剂，并选择甲苯作为完全可混溶的参考案例。通过在5 cm的更大尺度上成像位移模式，并同时在孔隙尺度上成像流动过程的细节，可以观察到戊烷和丙烷都沉淀出沥青质。但是在戊烷的情况下，沉淀的沥青质为固体，这会大大降低渗透率，从而导致堵塞。流动模拟的结果证实了地层堵塞对流动和扩散过程的影响。在丙烷的情况下，沉淀的沥青质相保持液态，因此是可移动的，这导致毛细管捕集。因此，丙烷的回收率比戊烷高约15％，而且更稳定。总的来说，这项研究表明，使用溶剂回收重油是一个动态过程，其中沥青质的孔尺度相特征对新鲜溶剂的运输和溶解的原油组分的生产都具有强烈的影响。溶剂之间的这些差异是关键，应包括在现场规模估算中。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号