水合物和成分耦合井筒模拟器:了解油气生产中伴生盐水对水合物的抑制作用

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
F. Coelho, K. Sepehrnoori, O. Ezekoye
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引用次数: 2

摘要

水合物是由水基晶格“包裹”气体分子组成的冰状固体。它们在高压和低温条件下形成。在石油和天然气行业,这些条件很容易满足,但水合物的形成可能会导致管道堵塞,并造成严重的经济影响,因此水合物的预防(和补救)是主要的流动保障问题之一。所需的水合物抑制作用可能来自与碳氢化合物流一起产生的水中自然溶解的电解质,或者可以故意注入醇类。当试图预测现实生产系统中的水合物条件时,计算机模拟应该理想地集成水合物和多相流计算。如果不这样做(例如,通过使用流动模拟器和单独的压力/体积/温度(PVT)包进行解耦分析),可能会在某些流动条件下产生误导性的结果。本文提出了一种集成井筒模拟器来解决这一问题。添加水合物模型以验证水合物形成的特定压力,温度和每个网格块的组成。与地球化学包的集成允许考虑来自伴生盐水的电解质抑制。在成功地将结果与现有的模拟器和实验数据进行比较后,表明当流动气水比(GWRs)超过105 scf/STB时,整个流动过程中的冷凝水可能会稀释盐水成分产生的有益效果,从而降低电解质的抑制作用。相反,沿着流动路径的矿物沉淀对这种效应的影响几乎可以忽略不计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Coupled Hydrate and Compositional Wellbore Simulator: Understanding Hydrate Inhibition from Associated Brines in Oil and Gas Production
Hydrates are ice-like solids composed of a water-based lattice “encaging” gas molecules. They form under conditions of high pressure and low temperature. In the oil and gas industry, where these conditions are easily met, hydrate formation may cause pipe blockages and severe financial implications, making its prevention (and remediation) one of the main flow-assurance concerns. Desired hydrate inhibition may come from electrolytes naturally dissolved in the water that is produced in conjunction with the hydrocarbon stream, or alcohols can be deliberately injected for such a purpose. When trying to predict hydrate conditions in real-world production systems, computer simulation should ideally integrate hydrate and multiphase-flow calculations. Failing to do so [by performing a decoupled analysis with a flow simulator and a separate pressure/volume/temperature (PVT) package for example] may generate misleading results under certain flow conditions. This paper presents an integrated wellbore simulator to deal with this issue. A hydrate model is added to verify hydrate formation for specific pressure, temperature, and composition of each gridblock. Integration with a geochemical package allows consideration of electrolyte inhibition coming from the associated brine. After successfully comparing results with the available simulators and the experimental data, it is demonstrated that when flowing gas/water ratios (GWRs) exceed 105 scf/STB, water condensation throughout the flow may dilute the beneficial effect arising from the brine composition, thus reducing electrolyte inhibition. Conversely, mineral precipitation along the flow path has shown a nearly negligible impact on this effect.
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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