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使用的方补芯，属钻井设备的器具。
The cardan type universal joint automatic drilling device can improve the production efficiency, reduce the scrap rate and have high safety performance.
能够提高生产效率，降低报废率，并且安全性能高。
The cardan type universal joint automatic drilling device can improve the production efficiency, reduce the scrap rate and have high safety performance.
能够提高生产效率，降低报废率，并且安全性能高。
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