Novel multi-phase transport processes using yield stress fluids

使用屈服应力流体的新型多相传输过程

• 批准号: RGPIN-2015-06398
• 负责人: Frigaard, Ian
• 金额: $ 4.15万
• 依托单位: University of British Columbia
• 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=690721
• 关键词: Novel; multi; phase; transport; processes

Visco-plastic fluids (with a yield stress) occur widely in industry & nature, e.g. toothpaste, wet pasta, cement and mud slurries, hair gel, paint suspensions. Fluids with yield stress may remain stationary even under an applied shear stress. As examples, consider a paint layer on a wall, fresh icing on a cupcake, yoghurt trapped in processing machinery or drilling fluid stuck in a wellbore during cementing. Although sometimes having a negative effect, the yield stress may also be exploited in novel ways leading to new flows. The first part of this project aims to develop 2 such new flow applications. The second part of the project concerns how to compute suspensions held in yield stress fluids in more efficient ways.***The first new application concerns droplet encapsulation and transport (on a large scale). The second new application concerns efficient transport of viscous fluids along pipelines. Both applications rely on a technique developed at UBC for eliminating interfacial instabilities (i.e. waves and eventual mixing) by using a yield stress fluid at the interface between fluids (VPL flows). Target applications for these flows would likely be within the oil & gas industry, although possibilities exist in slurry pipelining and food processing. The first project would improve wellbore integrity in enhancing delivery of downhole chemicals in e.g. acid fracturing of carbonate reservoirs. The second project is targeted at transport of heavy oil over long distances using reduced power. ***Regarding the second part of the project, applications of non-Newtonian suspension flows are very widespread in Canada's resource and energy industries, e.g. hole-cleaning (oil wells), mined tailings transport and deposition, dense pulp fiber flows, some viscous proppant transport. Key understanding, models and particularly computational tools are however missing and this project aims to correct this. Recent advances lead us to believe that this is possible. The impact of this would be mostly methodological, allowing others to tackle previously unreachable problems. ***The project also provides training for 2 PhD students and 1 postdoc, whom we hope will enter the Canadian workforce with their new skills. **

粘塑性流体（具有屈服应力）广泛存在于工业和自然中，例如牙膏、湿意大利面、水泥和泥浆、发胶、油漆悬浮液。即使在施加剪切应力的情况下，具有屈服应力的流体也可能保持静止。例如，考虑墙壁上的油漆层、纸杯蛋糕上的新鲜糖霜、加工机械中滞留的酸奶或固井过程中滞留在井眼中的钻井液。尽管有时会产生负面影响，但屈服应力也可以以新颖的方式利用，从而产生新的流动。该项目的第一部分旨在开发 2 个此类新的流量应用程序。该项目的第二部分涉及如何以更有效的方式计算屈服应力流体中的悬浮液。***第一个新应用涉及液滴封装和传输（大规模）。第二个新应用涉及粘性流体沿管道的高效输送。这两种应用都依赖于 UBC 开发的一项技术，通过在流体之间的界面（VPL 流）使用屈服应力流体来消除界面不稳定性（即波浪和最终混合）。这些流程的目标应用可能是石油和天然气行业，尽管也存在于浆料管道和食品加工领域。第一个项目将改善井眼完整性，以增强井下化学品的输送，例如：碳酸盐岩储层酸压裂。第二个项目的目标是使用低功率长距离运输重油。 ***关于项目的第二部分，非牛顿悬浮流的应用在加拿大的资源和能源行业非常广泛，例如：孔清理（油井）、尾矿输送和沉积、浓浆纤维流、某些粘性支撑剂输送。然而，关键的理解、模型，特别是计算工具却缺失，该项目旨在纠正这一问题。最近的进展使我们相信这是可能的。其影响主要是方法论上的，使其他人能够解决以前无法解决的问题。 ***该项目还为 2 名博士生和 1 名博士后提供培训，我们希望他们能够凭借新技能进入加拿大劳动力市场。 **