[中 文] AJ安全接頭安全接頭是繡井作業不可缺少的輔助工具，它可以控制和減輕井下遇卡或動作失靈無法釋放落魚，可很容易將此接頭旋開，收回安全接頭以上工作和管柱。
[English] The safety joint (sub)is one kind of indispensable auxiliary tool for well repair operation.It can be easily opened to retrieve the drilling tools and pipe string above the safety joint(sub),to controlor eliminate obstacles or malfunction during well drilling operation
