| 项目编号: | 1351296
|
| 项目名称: | CAREER: Impact of Mineralogy and Wettability on Pore-scale Displacement Mechanisms of Nonaqueous-Phase Liquids in Heterogeneous Rocks |
| 作者: | Lamia Goual
|
| 承担单位: | University of Wyoming
|
| 批准年: | 2013
|
| 开始日期: | 2014-09-01
|
| 结束日期: | 2019-08-31
|
| 资助金额: | USD408670
|
| 资助来源: | US-NSF
|
| 项目类别: | Standard Grant
|
| 国家: | US
|
| 语种: | 英语
|
| 特色学科分类: | Engineering - Chemical, Bioengineering, Environmental, and Transport Systems
|
| 英文关键词: | core-scale
; network model
; pore-scale
; napl
; wettability alteration
; water
; rock
; impact
; heterogeneous rock
; non-aqueous
; various napl/brine/rock system
; pore space topology
; two-phase flow simulation
; pore-by-pore basis
; dense non-aqueous phase liquid
; pore-space topology
; multi-scale rock
; non-aqueous phase liquid
; rock sample
; aqueous phase
; napl displacement mechanism
; rock mineralogy
; journey into underground rocks
; same rock
; light non-aqueous phase liquid
; rock strata
; pore-scale displacement
|
| 英文摘要: | 1351296
Goual
Groundwater is a precious resource in the US and other countries in the world. In many situations people have disposed of chemicals in the subsurface, either as a best practice at that time, or, unintentionally. Within the wide variety of organic chemicals many are not very soluble in water. If compounds that are not soluble in water enter the subsurface they tend to stay in concentrated zones referred to as non-aqueous phase liquids (NAPLs). If the chemicals are lighter than water they float on top of the water table and are referred to L-NAPLS (light non-aqueous phase liquids) and if the are heavier (more dense) than water they sink to the bottom of the water table and are referred to as D-NAPLs (dense non-aqueous phase liquids). These liquids do not move in the same manner as does the ground water and therefore may stay in one location acting as a long-term source of pollution. This proposed project will examine these NAPLs in rocks, where the rock strata are not evenly distributed in size (for example a sand) but rather in rocks that non-uniformed or what we refer to as heterogeneous formations. These system are extremely complex and the Principal Investigator, using experimental and modeling tools developer for oil exploration, will apply these to nearer surface (but yet sub-surface) systems where NAPLs exist. Through a better understanding of these processes we will be better able to manage our groundwater resources and provide water as a source of drinking water and for irrigation.
The tools that the PI will use will integrate experimental and modeling methods. X-ray computed micro-tomography will be used:
i) to generate high-resolution maps of pore space topology and mineralogy (shape and composition) in rock samples from which network models are made, and
(ii) to perform well-characterized in-situ flow experiments to measure fluid occupancy and the effect of surfactants on NAPL remediation in the same rocks.
The impact of NAPLs on wettability alteration will be examined using a state-of-the-art interfacial tension and contact angle apparatus. Because wetting forces lead to an equilibrium condition between the mineral surface, NAPL, and aqueous phase, this study will systematically consider NAPL/surfactant/water/mineral combinations that are likely to induce wettability alteration. Differences between measured macroscopic and microscopic properties will be highlighted. A novel dynamic pore-scale network model will be developed for two-phase flow simulations at the core-scale. The model will explicitly account for heterogeneities in rock mineralogy and wettability on a pore-by-pore basis to faithfully predict the impact of wettability alteration on NAPL displacement mechanisms in heterogeneous rocks. Unlike existing network models that are quasi-static, the dynamic pore-scale network model will incorporate physically based and mathematically rigorous treatment of the complex dynamics of pore-scale displacements that account for capillary, viscous, and gravity forces. It will use most realistic representations of pore-space topology and be heavily parallelized to handle network models at the core-scale.
The model will then be rigorously validated against the experimental data generated in this work to predict the performance of surfactant-enhanced remediation methods in various NAPL/brine/rock systems.
To help disseminate this the results of this research, the educational component of this proposal has three main
goals:
(1) foster interest in science and engineering, especially among women and minorities;
(2) engage undergraduate and graduate students through mentorship and guided research programs; and
(3) bridge the gap between current progress in science and engineering and K12/undergraduate teaching curriculum, public education, and service. The new "Journey Into Underground Rocks" will provide grade 6-12 students with an unforgettable opportunity to move with the flow inside multi-scale rocks using a newly-established CAVE, thus promoting their curiosity and scientific
interest.
Through its "Surface Science Days," the educational plan will contribute to increase the acceptance of underrepresented students in the society and work place by assisting them in reaching their full potential. |
| 资源类型: | 项目
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/95541
|
| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
|
|
There are no files associated with this item.
|
| Recommended Citation: | |
Lamia Goual. CAREER: Impact of Mineralogy and Wettability on Pore-scale Displacement Mechanisms of Nonaqueous-Phase Liquids in Heterogeneous Rocks. 2013-01-01.
|
|
|