kelly bushing guide skirt 方钻杆补心导盘
kelly bushing stabbing skirt 方钻杆补心下入盘
roller kelly bushing 滚子式方钻杆补心
split kelly bushing 拼合方钻杆补心
kelly-bushing 小补芯
rotary kelly bushing 补心海拔
kelly drive bushing 方钻杆补心
kelly bushing torque gauge 方补心扭矩仪
pin drive roller Kelly bushing 销轴驱动滚子方补心
The kelly bushing (KB) has an inside diameter profile that matches that of the kelly, usually square or hexagonal.
方钻杆补心的内径通常与方钻杆的外径（通常是四方钻杆或六方钻杆）相匹配。
Depth measurements are commonly referenced to the KB, such as 8327 ft KB, meaning 8327 feet below the kelly bushing.
井深测量通常是指方钻杆补心高度，如补心高度8327英尺，就意味着在方钻杆补心以下有8327英尺的深度。
The actual wellbore length from the kelly bushing (KB), derrick floor (DF), foundation or ground level (GL), to a point in the well or bottom of the well.
从方钻杆补心(KB)、钻台(DF)、底座或者地面标高(GL)到井中测量点或者井底的实际井筒长度。
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