本实用新型是一种在钻井过程中使用的方补芯，属钻井设备的器具。
The utility model relates to a square complement core for a well drilling process, which belongs to an appliance of a well drilling device.
本实用新型是一种在钻井过程中测量转盘扭矩的方补芯，属于钻井设备的器具。
The utility model relates to a square bushing for measuring the torsion of a rotary table in the process of drilling Wells, which belongs to an appliance of well drilling equipment.
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。
The kelly bushing (KB) has an inside diameter profile that matches that of the kelly, usually square or hexagonal.
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