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聚晶金刚石复合齿双中心钻头是一种钻头与扩眼器的组合，它主要由两部分组成：领眼钻头和扩眼器。领眼钻头与常规钻头相似，在钻井中使钻具定中。扩眼器所有的切削元件都位于其一侧，将领眼扩大到所要求的半径，这种独特的几何形状使双中心钻头能通过某些小井眼后再钻出一个较
Polycrystalline diamond composite tooth double center bit is a combination of bit and reamer, it is mainly composed of two parts: eye drill and reamer. A pilot bit is similar to a conventional bit, setting the drill in the well. All of the reamer’s cutting elements are located on one side and extend the collar to the required radius. This unique geometry allows the dual-center bit to pass through some of the slim holes and then drill one more