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首页> 外文期刊>SPE journal >Performance Of Drainage Experiments With Orinoco Belt Heavy Oil In A Long Laboratory Core In Simulated Reservoir Conditions
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Performance Of Drainage Experiments With Orinoco Belt Heavy Oil In A Long Laboratory Core In Simulated Reservoir Conditions

机译：在模拟储层条件下，在长实验室岩心中使用Orinoco带重油进行排水实验的性能

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摘要

When some heavy-oil reservoirs are produced using gas drive, they show three important features: low production gas/oil ratios, higher-than-expected production rates, and relatively high oil recovery. The mechanism for this unusual behavior remains controversial and poorly understood, though the term "foamy oil" is often used to describe such behavior. The impetus for this work stems from some recent projects performed in the Orinoco belt, Venezuela. There exist nearly one trillion bbl of heavy oil (oil in place) in this region on the basis of a recent evaluation. Two crucial issues must be addressed before or during designing production projects: What is a suitable method for evaluating the foamy-oil drive mechanism that plays a major role during such oil recovery, and how do we obtain a reasonable percentage of ultimate oil recovery? Unfortunately, it is still difficult to give good explanations for these two issues, although several studies were performed. This paper attempts to present better explanations for these two issues using experimental drainage in a long laboratory core in simulated reservoir conditions.Our experiments show that ultimate oil recovery for the heavy oil in the Orinoco belt can be as high as 15-20%. This high recovery comes from three contributions: fluid and rock expansion, foamy-oil drive, and conventional-solution-gas drive. Approximately 3-5% of recovery is from fluid and rock expansion, 11-16% from foamy-oil drive, and 2-4% from conventional-solution-gas drive. This ultimate-oil-recovery percentage is much higher than the 12% that has been used in the field-development plan for the Orimulsion project. The experiments performed and their findings obtained in this paper are representative at least in the Orinoco belt region.
机译：当使用气驱生产某些稠油油藏时，它们表现出三个重要特征：低产气/油比，高于预期的生产率以及相对较高的采油率。尽管经常使用术语“泡沫油”来描述这种行为，但这种异常行为的机制仍存在争议，并且知之甚少。这项工作的动力来自委内瑞拉奥里诺科带最近进行的一些项目。根据最近的评估，该地区有近1万亿桶重油（到位油）。在设计生产项目之前或期间必须解决两个关键问题：一种合适的方法来评估在此类采油过程中起主要作用的泡沫驱油机制，以及我们如何获得合理比例的最终采油量？不幸的是，尽管进行了数项研究，但仍然很难对这两个问题给出良好的解释。本文试图通过在模拟油藏条件下在较长的实验室岩心中进行实验排水来对这两个问题提供更好的解释。我们的实验表明，奥里诺科带的重油最终采收率可高达15-20％。如此高的采收率来自三个方面：流体和岩石膨胀，泡沫油驱和常规溶液气驱。大约3-5％的采收率来自流体和岩石膨胀，11-16％的采自泡沫油驱油，而2-4％的采自常规溶解气驱油。该最终采油率远高于Orimulsion项目现场开发计划中使用的12％。进行的实验以及他们在本文中获得的发现至少在奥里诺科带地区具有代表性。

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