<br>页岩纳米孔喉系统中盐度对油-卤水流动性影响的分子洞察,Langmuir

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页岩纳米孔喉系统中盐度对油-卤水流动性影响的分子洞察
Langmuir ( IF 3.7 ) Pub Date : 2023-11-08 , DOI: 10.1021/acs.langmuir.3c02421
Yongxian Cheng ₁ , Xiancai Lu ₂ , Qin Li ₁ , Xiandong Liu ₁

Affiliation

低盐度驱油已被公认为是提高页岩油采收率的一种有前景的策略，但其潜在机制仍不清楚，特别是对于充满油-盐水流体的复杂纳米孔网络。在这项研究中，首先基于分子动力学模拟研究了页岩纳米孔喉通道中不同盐度的油卤流体的压力驱动流动。确定了驱动油侵入充满不同盐度盐水的纳米喉管的临界压力。模拟结果表明，卤水盐度对石油可动性影响较大，低盐度有利于石油可动性的提高。对流体和孔壁之间的相互作用以及驱替压力的进一步分析揭示了盐水盐度对纳米孔喉中石油输送的双重影响。一方面，在水合复合物达到最大值之前，锚定在喉部壁上的水合阳离子扩大了喉部的有效流动宽度。另一方面，油和盐水之间的界面张力随着盐水盐度的增加而增加，这增加了毛细管阻力并导致更高的驱替压力。这些发现强调了盐水盐度对纳米孔喉中石油流动性的影响，这将促进对石油系统中石油聚集和消散的理解，并有助于提高石油采收率。

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Molecular Insights into the Salinity Effects on Movability of Oil–Brine in Shale Nanopore-Throat Systems

Low-salinity flooding has been well recognized as a promising strategy to increase shale oil recovery, but the underlying mechanism remains unclarified, especially for complex nanopore networks filled with oil–brine fluids. In this study, the pressure-driven flow of an oil–brine fluid with varying salinities in shale nanopore-throat channels was first investigated based on molecular dynamics simulations. The critical pressure driving oil to intrude into a nanothroat filled with brine of varying salinities was determined. Simulation results indicate that the salinity of brine exhibits great effects on the movability of oil, and low salinity favors the increase of oil movability. Further analysis of the interactions between fluid and pore walls as well as the displacement pressures reveals dual effects of brine salinity on oil transportation in a nanopore-throat. On the one hand, hydrated cations anchoring onto throat walls enlarge the effective flow width in the throat before the hydration complexes reach the maximum. On the other hand, the interfacial tension between oil and brine increases with the brine salinity, which increases the capillary resistance and leads to a higher displacement pressure. These findings highlight the effects of brine salinity on oil movability in a nanopore-throat, which will promote the understanding of oil accumulation and dissipation in petroleum systems, as well as help to develop enhanced oil recovery.

更新日期：2023-11-10

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