WELLBORE DRILL BIT NOZZLE

A wellbore drill bit assembly includes a drill bit that includes a drilling fluid pathway that has an inlet fluidly connected to a drilling fluid entrance of the drill bit and an outlet fluidly connected to a drilling fluid exit of the drill bit; and a nozzle positioned in the drilling fluid pathway, where at least a portion of the nozzle includes a removable material configured to dissolve or erode in contact with a drilling fluid additive. 一种井筒钻头组件，包括：钻头，该钻头包括钻井流体通路，所述钻井流体通路具有入口和出口，该入口以流体连通的方式连接到钻头的钻井流体进入口，该出口以流体连通的方式连接到钻头的钻井流体离开口；以及喷嘴，该喷嘴定位在钻井流体通路中，其中喷嘴的至少一部分包括可移除材料，可移除材料被配置成在与钻井流体添加剂接触时溶解或受到腐蚀。