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蒸气萃取方法是一种在开采稠油和沥青方面经济上可行、环境上可接受的极有潜力的方法。虽然已经有人进行了一系列的实验室实验来研究蒸气萃取过程,但是仍然没有弄清楚蒸气萃取过程中重力泄油的采收机理。本文采用实验和理论相结合的方法来研究重力和毛管力在蒸气萃取过程中对重力泄油的影响。首先,应用悬滴实验中的轴对称液滴形状分析技术,在低于各自蒸气压的条件下,测量了不同压力下稠油样品与四种不同的溶剂(甲烷、乙烷、丙烷和二氧化碳)之间的界面张力。其次,分别计算了在稠油油藏和填砂物理模型中蒸气萃取过程的邦德数。结果发现在测试的四个稠油-溶剂系统中,稠油和溶剂间的界面张力随着压力的降低呈线性关系减小,相应的邦德数随着压力增加而增加。邦德数的增加表明重力对蒸气萃取过程作用相对增大,从而提高了采收率。
Vapor extraction methods are an extremely viable and environmentally acceptable means of producing heavy oil and bitumen. Although a series of laboratory experiments have been conducted to study the steam extraction process, the mechanism of gravity drainage during vapor extraction has not yet been clarified. In this paper, the combination of experimental and theoretical methods to study the gravity and capillary force in the steam extraction process on the gravity drainage effect. First of all, using the axisymmetric drop shape analysis technique in the hanging drop experiment, the viscosities of heavy oil samples and four different solvents (methane, ethane, propane and carbon dioxide) under different pressures were measured under different vapor pressures. Interfacial tension. Secondly, the Bond numbers of steam extraction in heavy oil reservoirs and sand filling physical model were calculated respectively. The results showed that in the four heavy oil-solvent systems tested, the interfacial tension between heavy oil and solvent decreased linearly with decreasing pressure, and the corresponding Bond number increased with the increase of pressure. The increase in the number of bonds indicates that the effect of gravity on the vapor extraction process is relatively increased, thereby increasing the recovery rate.