Role of Ionic Composition and Interaction in Oil-Water-Rock Systems during Enhanced Oil Recovery Processes involving Low-Salinity Fluid and CO2 Injection

低矿化度流体和 CO2 注入提高采收率过程中油-水-岩石系统中离子组成和相互作用的作用

• 批准号: RGPIN-2019-04841
• 负责人: Sarma, Hemanta
• 金额: $ 2.4万
• 依托单位: University of Calgary
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=684997
• 关键词: Role; Ionic; Composition; Interaction; Oil

Today, exploration for new oilfields is a high-risk venture due to the low oil price. Therefore, a logical lower-cost alternative is to target and extract residual oil from the already discovered and developed oil reservoirs, particularly the Canadian light-oil reservoirs with an estimated oil reserve of 5.5 billion barrels. Even a single percent improvement in the recovery of oil from these reservoirs will yield rich dividends for Canada. My program has a direct relevance to such reservoirs in Canada and elsewhere, where the traditional waterflood has performed poorly due to unfavorable rock wettability and high post-flood residual oil saturation, thus making a difference between a successful and a marginal project, particularly in the current low-oil price environment. The unfavorable rock wettability, in particular, leads to poor relative permeability characteristics for the oil, and this in turn, causes the premature breakthrough of the injected water in production wells resulting in a much lower-than-expected oil recovery factor.**** My research aims to find solutions to overcome or diminish the effects of unfavorable rock wettability by making changes in the ionic composition and salinity of the injected water. In this program, I will also explore how some of these light-oil Canadian reservoirs can be utilized, concomitantly, to sequester CO2 and recover oil. Therefore, this program has dual objectives: EOR and partial CO2 sequestration through an EOR process.**** A systematic approach has been charted to meet the program objectives through a well-defined work plan comprising both modeling and experimental studies. The program includes a fundamental study of water geochemistry and key rock-fluid geochemical reactions under various ionic compositions. This is followed by a study of CO2 EOR with an optimized composition of the injected water to partly sequester CO2 in the reservoir. It will generate a new water chemistry to improve waterflood oil recovery as well as quantify the CO2 sequestration potential during CO2 EOR processes.**** Geochemical reactions and transport models developed in the program will be validated through specially-designed laboratory tests to study oil-rock-brine interactions, wettability alteration, relative permeability and surface-charge behavior, ionic transport, and finally, the oil recovery and CO2 fixation in the rock. This will be followed by additional validation using representative rock-fluid samples and data from a few selected Canadian light-oil reservoirs to establish the lab-to-field linkage of the program outcomes.**** During the course of the program, I will provide comprehensive research-based training in advanced modeling and laboratory studies to 7 HQPs, who will also engage synergistically in scholarly outreach, contributions and interactions with peers in dissemination of our findings through refereed journals, conferences and other such knowledge-sharing platforms, like forums and workshops.***

如今，由于油价低迷，勘探新油田是一项高风险的事业。因此，合乎逻辑的低成本替代方案是从已发现和开发的油藏中提取残余油，特别是估计石油储量为 55 亿桶的加拿大轻质油藏。即使这些油藏的石油采收率提高一个百分点，也将为加拿大带来丰厚的红利。我的计划与加拿大和其他地方的此类油藏有直接关系，在这些地方，由于岩石润湿性不利和洪水后残余油饱和度较高，传统注水法表现不佳，因此成功与边缘项目之间存在差异，特别是在当前的低油价环境。尤其是不利的岩石润湿性，导致石油的相对渗透率特性较差，进而导致生产井注入水过早突破，导致石油采收率远低于预期。*** * 我的研究旨在通过改变注入水的离子组成和盐度来找到克服或减少不利的岩石润湿性影响的解决方案。在本计划中，我还将探索如何同时利用加拿大的一些轻质油储层来封存二氧化碳并回收石油。因此，该计划具有双重目标：EOR 和通过 EOR 过程封存部分二氧化碳。**** 已经制定了系统方法，通过包括建模和实验研究的明确工作计划来实现计划目标。该计划包括对水地球化学和各种离子成分下关键岩石流体地球化学反应的基础研究。随后进行了 CO2 EOR 研究，其中优化了注入水的成分，以部分封存油藏中的 CO2。它将产生新的水化学，以提高水驱油采收率，并量化 CO2 EOR 过程中的 CO2 封存潜力。**** 该计划中开发的地球化学反应和传输模型将通过专门设计的实验室测试进行验证，以研究石油-岩石-盐水相互作用、润湿性改变、相对渗透率和表面电荷行为、离子传输，最后是岩石中的石油采收和二氧化碳固定。随后将使用代表性岩石流体样品和来自一些选定的加拿大轻油油藏的数据进行额外验证，以建立项目成果的实验室与现场联系。**** 在项目过程中，我将为 7 个总部提供基于研究的综合培训，包括高级建模和实验室研究，他们还将协同参与学术推广、贡献以及与同行的互动，通过审稿期刊、会议和其他此类知识共享平台传播我们的研究成果，例如论坛和研讨会.***