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在位于匈牙利南部的含超轻油油藏中应用贫气 (特别是甲烷富气、氮、二氧化碳、空气及其混合气 )正处在发展阶段。相关的研究和数学模拟明确表明 ,大幅度地提高了采油量 ,并且揭示出轻烃的重力分离和汽化是驱替机理的基本原理。但是 ,提出了有关在采油过程中存在异常界面现象和一些原油组分沉积的充分论据 ,因为该油藏的含蜡量和预测的汽化程度都高。因此 ,进行了详细的室内研究 ,以便确定氮、二氧化碳和贫甲烷对表面和界面特性的影响。在试验结果的基础上得出结论 :当把贫气和不活跃气体注入含超轻油油藏时 ,可以忽略众所周知的表面和界面效应 (像沥青质、树脂和重烃在界面处的富化 )。另一方面 ,在油藏空间和地面设备中 ,甚至当汽化程度很低时 ,也可能出现石蜡在油/水界面处沉积。由于最近才认识到这一可能的界面催化现象 ,需要进行进一步的室内和矿场研究 ,以便解释其对采收率、井动态和地面设备的不利影响。
The application of lean gas (especially methane-rich gas, nitrogen, carbon dioxide, air and their mixture) in the ultra-light oil-bearing reservoirs in southern Hungary is at an advanced stage of development. Relevant research and mathematical simulations clearly show that oil production is greatly increased and that the gravity separation and vaporization of light hydrocarbons are the basic principles of displacement mechanisms. However, sufficient arguments regarding the presence of anomalous interfaces in the production process and the deposition of some of the crude oil components have been proposed because of the high wax content and the predicted degree of vaporization in the reservoir. Therefore, a detailed in-house study was conducted to determine the effect of nitrogen, carbon dioxide and methane-depleted on the surface and interfacial properties. Based on the experimental results, it is concluded that the well-known surface and interfacial effects (such as enrichment of asphaltenes, resins and heavy hydrocarbons at the interface) can be neglected when injecting lean and inert gases into an ultra-light oil-bearing reservoir ). On the other hand, paraffin may also deposit at the oil / water interface in reservoir space and in surface equipment, even when the degree of vaporization is low. Due to the recent recognition of this possible interface catalysis, further in-house and field studies are needed to explain its adverse effects on recovery, well performance and surface equipment.