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首页> 外文期刊>Journal of Petroleum & Environmental Biotechnology >Evaluation of Asphaltene Deposition - A Systematic Study and Validation of Online Focused Beam Reflectance Measurement FBRM? at Reservoir Conditions
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Evaluation of Asphaltene Deposition - A Systematic Study and Validation of Online Focused Beam Reflectance Measurement FBRM? at Reservoir Conditions

机译：沥青质沉积的评估-在线聚焦光束反射率测量FBRM的系统研究和验证在水库条件下

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The production of crude oil from a reservoir is a challenging task. The handling of solids is one of the foremost assignments that operators may face during the life of a field. These solids may have the characteristics of both forms: inorganic material and organic material. The first one can be classified as salts and sand and the second comes from the crude oil that includes: waxes, asphaltenes, hydrates, and naphtenates. Apart from sand, the rest of the solids usually precipitate due to changes in composition (Commingling of fluids), temperature, or pressure. Asphaltenes precipitation is regarded to main issues referred to narrower mitigation strategy. Precipitate solid can produce reservoir blockage and in situ wettability change, decreasing well productivity widely. Know the operational conditions (PTx) under which the precipitation phenomena has been occurred is decisive, mainly the precipitation initial pressure (onset) and its velocity of formation. The purpose of this work consists in the experimental study of the asphaltenes precipitation from a crude oil sample under specific pressure and temperature representative of Brazilian pre salt reservoirs. In order to evaluate the impact of the operational conditions on solids formation and their relevant consequence to be used for petroleum exploration methods. The evaluation of solid formation was performed with Focused Beam Reflectance Measurement (FBRM?) at high pressure conditions, working with crude oil and live oil. The first stage involved the validation of asphaltenes precipitation for a batch system using crude oil and heptane at room conditions. The second one consisted in dynamic test carried out in a loop able to support pressures nearing 300 bars and temperatures up to 70°C. Furthermore, an experimental methodology was developed in order to charge live oil into loop system. The measurements were monitored by online Focused Beam Reflectance Measurement FBRM?. It was verified a greater count of asphaltene particles for range of 100-75 bars. There was more evidence in the asphaltenes precipitation in this period. It was possible to identify a pressure range combined to asphaltenes precipitation of target oil during depressurized system performed in successive stages. The pressure range combined with asphaltenes precipitation was revealed during the depressurization process that occurred in successive stages. Furthermore, the asphaltenes appearance was corroborated in the period of decrease from 100 to 75 bars. FBRM measurements allowed the asphaltenes appearance and growth for each stage of depressurization.
机译：从储层生产原油是一项艰巨的任务。固体的处理是操作人员在田间生命周期中可能面临的首要任务之一。这些固体可能具有两种形式的特征：无机材料和有机材料。第一种可以分类为盐和沙子，第二种可以分类为原油，其中包括：蜡，沥青质，水合物和环烷酸盐。除沙子外，其余的固体通常是由于组成（流体混合），温度或压力的变化而沉淀的。沥青质沉淀被认为是缩小减排策略的主要问题。沉淀的固体会造成储层堵塞和原位润湿性变化，从而大大降低油井的生产率。知道发生沉淀现象的操作条件（PTx）是决定性的，主要是沉淀初始压力（开始）及其形成速度。这项工作的目的在于在代表巴西预盐储层的特定压力和温度下，从原油样品中沉淀出沥青质的实验研究。为了评估操作条件对固体形成的影响及其相关结果，可用于石油勘探方法。固体形成的评估是在高压条件下使用聚焦光束反射率测量（FBRM？）进行的，该原油与活油一起使用。第一阶段涉及在室温下使用原油和庚烷对间歇系统的沥青质沉淀进行验证。第二个是动态测试，该测试在能够支持接近300巴的压力和最高70°C的温度的环路中进行。此外，开发了一种实验方法，以便将活油注入回路系统。通过在线聚焦光束反射率测量FBRM？监控测量。经证实，在100-75巴范围内，沥青质颗粒的数量更多。有更多的证据表明这一时期的沥青质沉淀。可以确定在连续阶段进行的减压系统中，与目标油的沥青质沉淀结合的压力范围。在连续阶段的降压过程中揭示了与沥青质沉淀结合的压力范围。此外，在从100巴降低到75巴的时期内，证实了沥青质的外观。 FBRM测量允许在减压的每个阶段沥青质的出现和生长。

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