C. Guerrero-Martin, E. Montes-Páez, M. Oliveira, J. Campos, E. Lucas
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引用次数: 6
Abstract
Asphaltenes precipitation is considered a formation damage problem, which can reduce the oil recovery factor. It fouls piping and surface installations, as well as cause serious flow assurance complications and decline oil well production. Therefore, researchers have shown an interest in chemical treatments to control this phenomenon. The aim of this paper is to assess the asphaltenes precipitation onset of crude oils in the presence of cardanol, by titrating the crude with n-heptane. Moreover, based on this results obtained at atmosphere pressure, the asphaltenes precipitation onset pressure were calculated to predict asphaltenes precipitation in the reservoir, by using differential liberation and refractive index data of the oils.
The influence of cardanol concentration on the asphaltenes stabilization of three Brazilian crude oils samples (with similar API densities) was studied. Therefore, three formulations of cardanol were prepared: The formulations were added to the crude at 5:98, 1.5:98.5, 2:98 and 4:96 ratios.
The petroleum samples were characterized by API density, elemental analysis and differential liberation test. The asphaltenes precipitation onset was determined by titrating with n-heptane and monitoring with near-infrared (NIR). The asphaltenes precipitation onset pressures were estimated. The envelope phase of the crude oils were also determined by numerical simulation (pipesim). In addition, supported in the downhole well profile and a screening methodology, the adequate artificial lift systems (ALS) for the oils were selected. Finally, the oil flow rates were modelling by NODAL analysis production system in the SNAP software.
The results of this study show the refractive index for each sample, and the predictive pressure to asphaltene instability. The asphaltenes precipitation onset of the crude oils were 2.06, 2.30 and 6.02 mL of n-heptane/g of oil. The cardanol was an effective inhibitor of asphaltenes precipitation, since it displaces the precipitation pressure of the oil to lower values. This indicates that cardanol can increase the oil wells productivity.
沥青质沉淀被认为是一个地层损害问题,它会降低采收率。它会污染管道和地面设施,造成严重的流动保障问题,并导致油井产量下降。因此,研究人员对化学治疗来控制这种现象表现出了兴趣。本文的目的是通过用正庚烷滴定原油来评估腰果酚存在下原油沥青质沉淀的开始。在此基础上,利用原油的微分解离和折射率数据,计算了沥青质析出开始压力,预测了储层中沥青质的析出。研究了腰果酚浓度对3种API浓度相近的巴西原油沥青质稳定性的影响。为此,制备了三种腰果酚配方:分别以5:98、1.5:98.5、2:98和4:96的比例加入粗料。采用API密度、元素分析和差解试验对石油样品进行了表征。采用正庚烷滴定法和近红外(NIR)监测法测定沥青质析出的起始时间。估算了沥青质沉淀开始压力。通过数值模拟(管道模拟)确定了原油的包络相。此外,在井下井廓和筛选方法的支持下,选择了适当的人工举升系统(ALS)。最后,利用SNAP软件中的NODAL分析生产系统对油流进行建模。本研究的结果显示了每个样品的折射率,以及沥青质不稳定性的预测压力。原油沥青质析出量分别为2.06、2.30和6.02 mL /g原油。腰果酚是一种有效的沥青质沉淀抑制剂,因为它取代了石油的沉淀压力到较低的值。说明腰果酚能提高油井产能。