Experimental investigation of the effect of the chemical flooding on the effective zeta potential in rock samples - improved understanding of the EOR

化学驱对岩石样品有效 zeta 电位影响的实验研究 - 提高对 EOR 的认识

• 批准号: 1957440
• 金额: --
• 依托单位: University of Aberdeen
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-1957440
• 关键词: Experimental; investigation; effect; chemical; flooding

The aim of this research is to determine experimentally the effects controlled salinity waterflooding (CSW) (low-salinity effect) has on chemical floods. This will be achieved by measuring parameters such as the zeta potential that are influenced by both chemical flood and CSW schemes and to observe if any additional changes in these parameters due to synergy correlate to a meaningful positive influence on incremental oil recovery. The inspiration for this PhD came from recent evidence that suggested that changes in the zeta potential of the oil-brine and mineral-brine interfaces lead to changes in the wetting state in CSW experiments. Changing of the wetting state to mixed-wet in CSW experiments and mixed/water-wet in chemical floods have been identified previously as favourable to increase incremental oil recovery. Hence this research should improve our understanding of wettability control and can improve the performance of these flood schemes.The work planned for this PhD includes: a literature review and meta-analysis of chemical floods and CSW in carbonates and sandstones, experimental work including single-phase & multi-phase behaviour tests and core flood experiments. The single-phase experiments will focus on measuring the key parameters that characterise how the reservoir (rock sample) and fluids (formation brine, injection brine or crude oil) interact with each other such as permeability and zeta potential of the mineral-brine interface. The multi-phase experiments will be conducted at the same time as the core flood experiments which will determine the ultimate oil recovery of the flood and will allow for the determination of many factors that characterise how the oil, formation brine and injected brine interact with each other such as: relative permeability and zeta-potential measurements of the oil-brine and mineral-brine interface. The equipment will be capable of taking live readings so changes in these parameters can be monitored in real time. The experiments will be performed at conventional reservoir conditions and the properties and compositions of the initial brines, oils and effluents will be evaluated. The altered variables and how they will be manipulated to achieve optimum results in this experiment will be determined by the literature review & meta-analysis and by the single-phase and multi-phase behaviour tests.Other sub-objectives that have been identified as potential further research include: optimising chemical floods with CSW by reducing the amount of chemical used to achieve similar performance to conventional chemical floods, the effects of strontium in the formation brine, alteration of the temperature the experiments are performed at, different formations (carbonates and sandstones) and what effects hard and soft aquifer water replacing seawater as a component of the CSW scheme has on the performance of chemical flooding + CSW.This project will have applications in the oil industry as a potential novel enhanced oil recovery technique. The project also aims to enhance our understanding of chemical floods and its synergistic effects with CSW by determining how factors that haven't previously been considered such as the zeta potential of the oil-brine and mineral brine interface influence ultimate oil recovery. Accounting for these factors could explain why some CSW and chemical floods either fail or underperform.

本研究的目的是通过实验确定控制盐度注水 (CSW)（低盐度效应）对化学驱的影响。这将通过测量受化学驱和 CSW 方案影响的 zeta 电位等参数来实现，并观察这些参数由于协同作用而发生的任何额外变化是否与对增量石油采收率产生有意义的积极影响相关。该博士的灵感来自于最近的证据，这些证据表明油-盐水和矿物-盐水界面的 zeta 电位的变化会导致 CSW 实验中润湿状态的变化。先前已发现，CSW 实验中的润湿状态变为混合润湿状态以及化学驱中的混合/水润湿状态有利于提高增量石油采收率。因此，这项研究应该提高我们对润湿性控制的理解，并可以提高这些驱油方案的性能。本博士计划的工作包括：碳酸盐岩和砂岩中化学驱和 CSW 的文献综述和荟萃分析，包括单相和多相行为测试以及岩心驱油实验在内的实验工作。单相实验将重点测量表征储层（岩石样品）和流体（地层盐水、注入盐水或原油）如何相互作用的关键参数，例如矿物-盐水界面的渗透率和 zeta 电位。多相实验将与岩心驱油实验同时进行，岩心驱油实验将确定驱油的最终采收率，并确定表征石油、地层盐水和注入盐水如何相互作用的许多因素，例如：油-盐水和矿物-盐水界面的相对渗透率和zeta电位测量。该设备将能够实时读取数据，因此可以实时监控这些参数的变化。实验将在常规油藏条件下进行，并对初始盐水、油和流出物的性质和成分进行评估。本实验中改变的变量以及如何操纵它们以实现最佳结果将通过文献综述和荟萃分析以及单相和多相行为测试来确定。已确定为潜在进一步研究的其他子目标包括：通过减少化学品用量来优化 CSW 化学驱，以实现与常规化学驱相似的性能，地层盐水中锶的影响，温度的改变 在不同的地层（碳酸盐和砂岩）中进行了实验，以及作为 CSW 方案的一部分，硬和软含水层水替代海水对化学驱 + CSW 性能的影响。该项目将作为一种潜在的新型提高采收率技术在石油工业中得到应用。该项目还旨在通过确定以前未考虑的因素（例如油-盐水和矿物盐水界面的 zeta 电位）如何影响最终石油采收率，来增强我们对化学驱及其与 CSW 协同效应的理解。考虑到这些因素可以解释为什么一些 CSW 和化学驱要么失败要么表现不佳。