Asphaltene Stability in Crude Oil during Production Process
Asphaltene Stability in Crude Oil during Production Process
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生产过程中原油中沥青质的稳定性
DOI：
10.4172/2157-7463.1000142
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
H. A. Khalifeh
中科院分区：
文献类型：
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作者：
H. Belhaj;H. A. Khalifeh
沥青质的不稳定性可能在储层中发生，导致渗透率受损，并导致流动受限问题。它也可能发生在生产管柱和地面设施中，造成管道堵塞。在生产的任何阶段，石油成分或压力和温度的任何变化都会使原油不稳定，从而产生沥青质沉淀。本文研究了目标原油在直流电影响下的稳定性。研究了沥青质沉积量及其在不同操作条件下的电荷。该方法包括在浸在原油样品中的两个金属电极之间施加直流电压。在实验期间，利用连接到电极上的微型两个称重传感器记录电极表面积累的沉积物量。可施加高达500V的电场强度。这项研究证实了沥青质胶体是带电的。在阳极表面形成沉积物的事实证明沥青质颗粒具有负电荷。实验表明，时间和电位差是敏感参数。在前24小时，原油中的沥青质全部被提取出来。这一现象要么反映了样品中沥青质含量有限，要么说明树脂含量对沥青质胶体的电荷转换起主要作用。
Asphaltene instability may take place in the reservoir leading to permeability damage and contributing to flow restriction issues. It may also occur in production strings and surface facilities causing conduit clogging. Any change in oil composition or pressure and temperature at any stage of production will destabilize crude oil producing asphaltene precipitation. In this study, the stability of target crude oil under the influence of a direct current (DC) is investigated. The amount of the asphaltene deposit and its electrical charge at various operating conditions are investigated. The method consists of applying a DC voltage between two metal electrodes immersed in the crude oil sample. The amounts of deposits accumulated on the surfaces of the electrodes are recorded during experiment time utilizing a miniature two load cells connected to the electrodes. Electric field strength up to 500V is applied. This study confirms that asphaltene colloids are electrically charged. The fact that deposits form on the anode surface proves that asphaltene particles possess a negative charge. The experiment shows that time and potential differences are sensitive parameters. At the first 24 hours, all the asphaltene in the crude oil were extracted. This phenomenon reflects either limited amount of asphaltene exists in the sample, or that the resin content plays a major role in asphaltene colloids charge switch.