Jet flow control for higher drilling efficiency

用于钻取石油、天然气、水等钻孔的钻头是一种由单个切割装置和通道组成的复杂装置，用于去除材料。Shear Bits是一家位于卡尔加里的公司，不仅生产定制钻头，而且还继续研究和开发新技术。过去，重点一直放在开发新的切削工具和技术上。从他们自己的工作和客户反馈中可以明显看出，为了进一步提高他们的技术，需要更好地了解刀具面切削液的流体动力学或液压特性以及切削材料的去除。Shear Bits正与阿尔伯塔大学合作开展这方面的研究活动。对于这些大型钻头，切削液直接注入钻头切削面，目的是去除材料或切屑，并润滑和冷却刀具。这些工具是具有特定形状和材料的独立刀片，可针对特定的岩石地质条件实现最大的切削性能。为了改善钻头水力学性能，可以优化射流模式，以更好地去除碎屑，并对钻井井底的岩石进行更大的侵蚀。文献强调，具有大型有组织涡结构的自共振射流将使钻井速度比传统射流高2-6倍。最初的流动可视化实验将在阿尔伯塔大学进行，目的是确定钻井液的特征流动模式。实验原型将使用3D打印技术来研究多种冲击钻头射流配置。同时进行的流动可视化和非定常压力测量将提供从钻头射流出口向撞击壁面平流的涡状结构的深入描述。同时，将对文献进行广泛的回顾，以确定当前学术界对这类流动的理解。与阿尔伯塔大学的合作将进一步提高钻井性能，并有助于确保加拿大在钻井行业的世界领先地位。

A drill bit used in the drilling of boreholes for oil, gas, water etc. is a complex arrangement of individual cutting devices and channels for removal of material. Shear Bits is a Calgary based company that not only manufactures custom drill bits but also continues to research and develop new technology. In the past, the focus has been on developing new cutting tools and technology. It has become evident from their own work and customer feedback that better understanding of the hydro-dynamics or hydraulics of the cutting fluid at the cutter face and the removal of cut material is needed for further advancement of their technology. Shear Bits is partnering with the University of Alberta to a research campaign with this focus. For these large-scale drill bits, cutting fluid is injected directly at the bit cutting face with the aim of removal of material or chips and lubrication and cooling of the cutting tools. These tools are individual inserts of specific shape and material that are arranged for maximum cutting performance for a specific rock geology. To improve the bit hydraulics, jet flow patterns can be optimized for better chip removal and greater erosion of the rock in the bottom-hole of the drilling well. The literature highlights that self-resonating jets with large scale organized vortical structures will lead to drilling rates 2-6 times greater than with traditional jets. An initial flow visualization experiment will be carried out at the University of Alberta with the aim to identify the characteristic flow patterns of the drilling fluid. An experimental prototype will be built using 3D printing technology for investigating multiple impinging bit jet configurations. Simultaneous flow visualization and unsteady pressure measurements will provide an in-depth description of the vortical structures being advected from the bit jet exit towards the impinging wall. At the same time, an extensive review of the literature will be carried out to identify the current academic understanding this type of flow. This partnership with the University of Alberta would allow further improvement of the drilling performance and help secure Canada's place as a world leader in the drilling industry.