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An experimental evaluation of low salinity water mechanisms in a typical Brazilian sandstone and light crude oil with low acid/basic number

机译：典型巴西砂岩中低盐水水机制的实验评价，低酸/基本数

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Low salinity water injection (LSWI) is a current and cost-effective method to enhance oil recovery by changing the salinity and composition of the injected water. However, the synergistic effect of chemical composition, concentration and in particular the pH of the brine in oil recovery during LSWI remains not well understood. In addition, there is a lack of low salinity studies in Brazilian sandstone rocks and light paraffinic crude oils of low acid/basic number to date. This paper investigates oil recovery mechanisms and the pH effect in high and low salinity brine solutions using samples from a clastic reservoir in Reconcavo basin, northeastern Brazil. Zeta potential and interfacial tension measurements, oil adsorption analysis using a quartz crystal microbalance with dissipation monitoring, and core flooding experiments were performed using different concentrations and pH values of synthetic formation water (SFW), NaCl and CaCl2 brine solutions. The results indicate that when the reservoir pH changes towards the alkaline conditions driven by ionic exchanges during LSWI, it may approximate the isoelectric point (IEP) of pH-dependent surface charges in oil and rock minerals, weakening the electrostatic attraction between their surfaces, and consequently contributing to increased oil recovery. The findings of this study can help understand oil recovery mechanisms during LSWI according to the type and content of pH-dependent surface charges in sandstone rocks and crude oils. This study also shows how to preselect potential field candidates in the Reconcavo basin and similar formations for stand-alone and hybrid LSWI applications.
机译：低盐水注水（LSWI）是一种通过改变注入水的盐度和组成来增强采油的电流和经济高效的方法。然而，化学成分，浓度和特别是LSWI中的盐水​​中的pH的协同作用仍未充分理解。此外，巴西砂岩岩石缺乏低盐度研究，迄今为止的低酸/基本数量的低级石蜡原油。本文调查了巴西·巴西·东北部Reconcavo盆地中的碎屑水库的样品，研究了石油回收机制和高水平盐水盐水溶液中的pH效应。 Zeta电位和界面张力测量，使用具有耗散监测的石英晶微观的油吸附分析，以及使用不同浓度和合成形成水（SFW），NaCl和CaCl2盐水溶液的pH值进行核心泛洪实验。结果表明，当储层PH对LSWI期间离子交换驱动的碱性条件时，它可以近似油和岩石矿物质的pH依赖性表面电荷的等电点（IEP），削弱其表面之间的静电吸引力，以及因此，有助于提高储油。本研究的发现可以根据砂岩岩石和原油的pH依赖性表面电荷的类型和含量来帮助了解LSWI期间的储油机制。本研究还展示了如何将潜在的现场候选人预定在ReconCavo盆地中的潜在场候选以及独立和混合LSWI应用的类似地层。

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