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Models of flow and mixing of CO2 and brines in heterogeneous porous media

CO2 和盐水在非均质多孔介质中的流动和混合模型

基本信息

批准号：
1928880
负责人：
金额：
--
依托单位：
University of Cambridge
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-1928880
关键词：
Models flow mixing CO2 brines

项目摘要

Sub-surface carbon storage, which involves separation of CO2 from power station fuels or waste gases and injection and storage of the CO2 underground, offers one of the more economical and practical methods for society to manage its transition to a low-carbon economy. A key aspect of sub-surface carbon storage is the need to ensure that the storage is safe and efficient and this requires the ability to model the fate of the CO2 over the ~ 10000 year storage period. Key mechanisms which will increase the security of CO2 storage are residual trapping, where some CO2 is retained in pore space by surface tension, and solubility trapping in which CO2 dissolves in formation brines. The rate at which both these mechanisms will operate will be strongly controlled by the small and medium scale (10 cm to 100's m) heterogeneities in permeability of the reservoirs.The project will examine the impact of the characteristic heterogeneities in sedimentary units on the rates of residual and solubility trapping. The project will use a combination of approaches. Laboratory experiments and theoretical analysis for miscible currents with large viscosity differences may be used to understand the flow of brines and CO2 through heterogeneous media characteristic of reservoirs. The project may combine this with field studies of the permeability heterogeneities of sedimentary formations and use this information to predict the important structural heterogeneities of potential CO2 reservoirs.The student will become familiar with the processes and requirements for geological carbon storage. They will join a group of more than 10 (faculty, post-docs and students) working on a whole range of problems related to CO2 storage. The student will be encouraged to interact with this group who are carrying out related research on a variety of issues in carbon storage including modelling of multi-phase flow, seismic imaging of reservoirs and studying the fluid-fluid and fluid-mineral reactions within reservoirs. While the modelling will be based on the field examples, the theoretical and experimental tools developed will be generic and applicable to a wide range of heterogeneous media.

地下碳储存涉及将CO2从发电站燃料或废气中分离出来，并将CO2注入和储存在地下，为社会管理向低碳经济的过渡提供了一种更经济实用的方法。地下碳储存的一个关键方面是需要确保储存是安全和有效的，这需要能够模拟CO2在~ 10000年储存期内的命运。提高CO2储存安全性的关键机制是残余捕获，其中一些CO2通过表面张力保留在孔隙空间中，以及溶解度捕获，其中CO2溶解在地层盐水中。这两种机制运作的速度将受到储层渗透率的中小尺度（10厘米至100米）不均匀性的强烈控制。该项目将研究沉积单元中的特征不均匀性对残余物和溶解度捕获速度的影响。该项目将采用各种方法的组合。大粘度差混相流的实验和理论分析可以用来理解盐水和CO2在油藏非均质介质中的渗流特征。该项目可能将联合收割机与沉积地层渗透率不均匀性的实地研究相结合，并利用这些信息预测潜在CO2储层的重要结构不均匀性。学生将熟悉地质碳储存的过程和要求。他们将加入一个由10多名教师、博士后和学生组成的小组，研究与二氧化碳储存相关的一系列问题。学生将被鼓励与这个小组进行互动，他们正在对碳储存中的各种问题进行相关研究，包括多相流的建模，储层的地震成像以及研究储层内的流体-流体和流体-矿物反应。虽然建模将基于现场实例，但开发的理论和实验工具将是通用的，适用于广泛的非均质介质。