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首页> 外文学位 >Asphaltene Precipitation During Solvent Injection at Different Reservoir Conditions and Its Effects on Heavy-Oil Recovery from Oilsands.
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Asphaltene Precipitation During Solvent Injection at Different Reservoir Conditions and Its Effects on Heavy-Oil Recovery from Oilsands.

机译：不同储层条件下溶剂注入过程中沥青质的析出及其对油砂中重油回收的影响。

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摘要

Solvent injection at elevated temperatures (hot solvent or steam-solvent hybrid injection) into heavy-oil/bitumen reservoirs is a promising recovery process. It increases oil mobility via oil dilution, molecular diffusion, and gravity drainage. Meanwhile, injection of light hydrocarbon solvents creates disequilibrium between resins and asphaltene in the oil. Then, asphaltene starts to flocculate and bond to each other in the fluid and on the rock surface. Consequently, permeability reduction due to pore plugging and wettability alteration may take place affecting the underground upgrading and recovery process negatively.;In this thesis, these asphaltene related concerns during solvent injection at different reservoir conditions were investigated through experimental work. A combination of two heavy-oil compositions and four solvent types were tested at different pressure and temperatures to determine the optimal solvent type and operational conditions minimizing the negative effect of asphaltene. The results obtained from visual PVT cell (testing fluid behaviour) and sandpack system (testing heavy-oil recovery) experiments were cross-checked. The roles of solvent type and operation conditions (mainly temperature) on the heavy-oil recovery, wettability alteration, and pore plugging were clarified and presented quantitatively and visually.
机译：在高温下将溶剂注入（热溶剂或蒸汽-溶剂混合注入）注入重油/沥青储层是一个很有前途的回收过程。它通过油稀释，分子扩散和重力引流提高了油的流动性。同时，注入轻质烃类溶剂会在油中的树脂和沥青质之间造成不平衡。然后，沥青质开始在流体中和在岩石表面上絮凝并彼此结合。因此，可能由于孔隙堵塞和润湿性改变而引起的渗透率降低，从而对地下改造和采收过程产生负面影响。本论文通过实验工作研究了在不同储层条件下溶剂注入过程中这些与沥青质有关的问题。在不同的压力和温度下测试了两种重油组合物和四种溶剂类型的组合，以确定最佳的溶剂类型和操作条件，以最大程度地减少沥青质的负面影响。交叉检查了从目视PVT池（测试流体行为）和沙堆系统（测试重油回收率）实验获得的结果。明确了溶剂类型和操作条件（主要是温度）对稠油采收率，润湿性变化和孔堵的作用，并定量地和直观地显示了这些情况。

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  • 作者

    Moreno Arciniegas, Laura Smith.;

  • 作者单位

    University of Alberta (Canada).;

  • 授予单位 University of Alberta (Canada).;
  • 学科 Civil engineering.
  • 学位 M.S.
  • 年度 2014
  • 页码 142 p.
  • 总页数 142
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 老年病学;
  • 关键词

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