加一个(丝扣)护箍。
在革掉套管接箍和圆扣套管的前提下，建议采用无接箍、特殊扣型套管，以提高深井的套管强度。
On the premise of abrogating the casing collars and the casings with round thread. the casings with special thread and without collar are recommended to be used. in order…
指出，螺纹脂涂抹以及螺纹脂质量对套管的上、卸扣、密封性能、及粘结倾向影响很大，而上扣扭矩过大、接箍变形、错扣等情况将会造成严重粘扣现象。
Meanwhile, it is pointed out that the smearing of the thread sealant and its quality have a great effect on making - up and breaking - out of casing pipe...
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