Modelling and numerical calculation of the multiphase transport in deep drilling technology

深井钻井技术中多相输运的建模与数值计算

• 批准号: 441175148
• 负责人: Professor Dr.-Ing. Gunther Brenner
• 金额: --
• 依托单位: Institut für Technische Mechanik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/441175148?language=en
• 关键词: Modelling; numerical; calculation; multiphase; transport

The aim of this project is to investigate the transport of particles in viscoplastic fluids using numerical methods and to aggregate derived findings in engineering models. The background of the project is the transport of cuttings in deep drilling technology. Deep drilling technology is of great importance for securing the future energy supply. This concerns the use of fossil fuels as well as the production of geothermal energy. In both cases, the drilling process is the most important cost parameter, so that efficient, time-optimised process control is required. For ecological reasons, the integrity of the borehole is of particular importance in order to prevent unwanted leakage of drilling fluids into the geological formation. The above goals can only be achieved by model-based, systematic optimization and automation of the drilling process. From the point of view of fluid mechanics, the transport of cuttings from the borehole is important. This must be quantified in suitable models for the conditions typical of deep drilling, i.e. high pressures and temperatures, the use of drilling fluids with complex rheology and over distances of several kilometres under variable environmental conditions.This approach in the present project is based on state-of-the-art computational techniques for the analysis of particle transport in liquids. These methods are extended as required and validated on the basis of experimental data. This will make it possible to quantify the effects of secondary flows or the rheology of the liquid on particle transport that have not been studied up to now. In this project, the work of the last years in the group of the applicant and at the TU Clausthal will be continued and extended.The present project will contribute to the clarification and better quantification of the hydrodynamic processes for the deep drilling process. However, there are numerous parallels to other fields of technology in which similar questions arise. Examples are fluidisation, filtration, paper processing, waste water treatment or food technology.

该项目的目的是研究粘塑性流体中颗粒的传输，使用数值方法，并在工程模型中汇总得出的结果。本课题的研究背景是深井钻井中的岩屑输送技术。深井钻井技术对保障未来能源供应具有重要意义。这涉及化石燃料的使用以及地热能的生产。在这两种情况下，钻孔过程都是最重要的成本参数，因此需要进行高效、时间优化的过程控制。出于生态原因，钻孔的完整性是特别重要的，以便防止钻井液不希望地泄漏到地质构造中。上述目标只能通过基于模型的系统优化和钻井过程的自动化来实现。从流体力学的观点来看，岩屑从井眼的输送是重要的。这必须在适当的模型中量化，以适应深层钻井的典型条件，即高压和高温、使用具有复杂流变性的钻井液以及在可变环境条件下长达数公里的距离。这些方法根据需要进行了扩展，并在实验数据的基础上进行了验证。这将使得有可能量化到目前为止尚未研究的二次流或液体流变学对颗粒输送的影响。在这个项目中，申请人和克劳斯塔尔工业大学过去几年的工作将继续和扩展。本项目将有助于澄清和更好地量化深井钻井过程的流体动力学过程。然而，其他技术领域也存在许多类似的问题。例如流化床、过滤、造纸、废水处理或食品技术。