在低盐度沉浸期间碳酸盐的表面电荷变化
Felix Feldmann1, Emad W Al-Shalabi2, Aksel Hiorth3
1NORCE Norwegian Research Centre, Stavanger, Norway. felix.feldmann@norceresearch.no.
Scientific reports
|June 6, 2024
概括
优化注射水的盐度通过改变岩石的湿透性来增强油的回收. 这项研究表明,碳酸盐岩类型显著影响表面电荷变化和可湿性,影响石油回收效率.
科学领域:
- 石油工程是石油工程中的一个.
- 地质化学 地质化学
- 物理化学 物理化学
背景情况:
- 低盐度注水已被认为可以在实验室环境中改善石油回收,但潜在的机制仍在争论中.
- 现有的研究往往强调盐水成分,忽视了碳酸盐水库中岩石流体相互作用的关键作用.
研究的目的:
- 为了研究各种碳酸盐岩石材料对表面电荷,可湿性变化和自发浸泡的影响.
- 阐明特定离子 (,,硫酸盐) 对岩石表面电荷和湿度的影响.
- 开发一个数值模型,将表面电荷变化与毛细血管压力和石油回收联系起来.
主要方法:
- 进行了泽塔电位测量,以分析不同碳酸盐岩材料对各种盐水盐度 (形成水,海水,稀释海水) 的表面电荷反应.
- 进行了自发浸泡试验,以评估不同盐水条件下的油脂回收和可湿性变化.
- 开发了一个数值模型,结合计算的表面电荷和实验确定的泽塔电位之间的区别,并将表面电荷变化与毛细管压力变化联系起来.
主要成果:
- 每种碳酸盐岩石材料都对不同的盐水表现出独特的表面电荷反应,对,和硫酸盐离子的敏感性各不相同.
- 与最初的碳酸盐形成水系统相比,系统表面电荷的减少与石油回收的增加以及向水湿条件的转变有关.
- 数值模型成功地通过将表面电荷与毛细血管压力联系起来,成功地复制了实验观察到的对泽塔电位和历史匹配的自发沉浸试验的离子效应.
结论:
- 碳酸盐岩石材料在低盐度水注入过程中对湿度的改变和油的回收起着至关重要的作用.
- 准确的建模需要区分计算的表面电荷和泽塔电位,考虑到剪切平面位置.
- 虽然实验室规模的湿度变化在几周内被观察到,但在现场规模的分子扩散驱动的变化估计需要几个世纪.
相关概念视频
Ionic Strength: Effects on Chemical Equilibria
1.4K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
In this solution, the primary...
1.4K
Solubility Equilibria
52.5K
Solubility equilibria are established when the dissolution and precipitation of a solute species occur at equal rates. These equilibria underlie many natural and technological processes, ranging from tooth decay to water purification. An understanding of the factors affecting compound solubility is, therefore, essential to the effective management of these processes. This section applies previously introduced equilibrium concepts and tools to systems involving dissolution and precipitation.
The...
The...
52.5K
Polyprotic Acids
29.1K
Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
29.1K
Titration of Polyprotic Base with a Strong Acid
789
The titration of a polyprotic base such as sodium carbonate with a strong acid such as hydrochloric acid results in two equivalence points on the titration curve. At the first equivalence point, the carbonate ions in the base are completely converted to bicarbonate ions. The second equivalence point corresponds to the complete conversion of bicarbonate ions to carbonic acid, which dissociates into carbon dioxide and water. The region before the first equivalence point corresponds to the...
789
Factors Affecting Solubility
33.4K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
33.4K
Common Ion Effect
41.5K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
41.5K


