Jet flow control for higher drilling efficiency

石油、天然气、水等钻孔中使用的钻头是由单独的切割设备和通道组成的复杂排列，用于去除材料。剪切钻头是一家总部位于卡尔加里的公司，不仅生产定制钻头，还继续研究和开发新技术。过去，重点一直放在开发新的刀具和技术上。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，需要更好地了解切削液在刀具表面的流体动力学或水力学，以及切割材料的去除。Slip Bits正在与艾伯塔大学合作开展一项以此为重点的研究活动。对于这些大型钻头，切削液直接注入到钻头切削面，目的是去除材料或切屑，并对刀具进行润滑和冷却。这些工具是特定形状和材料的单独刀片，为特定岩石地质的最大切割性能而安排。为了改善钻头水力学，可以优化射流流型，以更好地清除钻井井底的切屑和更大程度地侵蚀井底岩石。文献强调，具有大规模有组织涡旋结构的自共振射流将导致钻井速度比传统射流高2-6倍。为了确定钻井液的特征流动模式，将在艾伯塔大学进行初步流动可视化实验。将利用3D打印技术建立一个实验样机，用于研究多个撞击钻头射流的结构。同时的流动显示和非定常压力测量将提供从钻头射流出口向冲击壁面平流的涡旋结构的深入描述。同时，对文献进行了广泛的回顾，以确定目前学术界对这类流动的理解。与艾伯塔大学的这一合作关系将使钻探性能得到进一步改善，并有助于确保加拿大作为钻探行业世界领先者的地位。

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.