在石油天然气钻井施工过程中，常常造成钻具接头磨损、偏磨及丝扣粘连，这是引起钻具损坏进而演化为井下事故的主要原因之一。
In the construction process of oil and gas drilling, the joint drill wear, eccentric wear and threaded partial adhesion caused drilling damage and then evolved into the major mine accidents.
方钻杆之后带动整个钻柱进行旋转，由于方钻杆是与钻柱的顶部用丝扣连接在一起的。
The kelly then turns the entire drillstring because it is screwed into the top of the drillstring itself.
为进行打捞或回收钻柱，通常的卸开作业总是采用反扭矩，和在所选用的丝扣连接内引爆炸弹。
To facilitate the fishing or recovery operation, the backoff is usually accomplished by applying reverse torque and detonating an explosive charge inside a selected threaded connection.
由于卸扣会使钻具产生弯曲力，因此，钻具接头必须尽可能低些坐在卡瓦上。
Since a bending force is exerted on the pipe during break out, the tool joint connection must be set in the slips as low as possible.
永远不要反转转盘为钻铤和管子上扣。
Never reverse rotary table into the DC or any tubular when making up connections.
钻工们卸掉安全扣合弹簧和大钳销子，换上与要上扣的钻具或管具相匹配的钳头。
The driller ensures that the safety latch springs are replaced on the tong pins.
当卸扣时，有疑难题目的接头要划上记号，记载在钻具记载本上，并向带班队长汇报。
When breaking out singles, any problem connection must be marked, recorded in the Tally Book and reported to the Toolpusher.
非开挖反向回拉扩孔施工过程中时常出现钻杆正转而发生退扣，造成钻具孔内脱落事故的反常现象。
The dropping buckle usually occurs when reverse pulling is used for expanding the bore in the trenchless construction, thus causing the fall-off of the drilling tools.
钻工使用气动旋扣器卸开扣，或者如果可能，司钻用顶驱卸开扣。
The Floormen spin out the connection using the air spinner, or if applicable, the Driller utilises the top drive to spin out the connection.
钻工使用气动旋扣器卸开扣，或者如果可能，司钻用顶驱卸开扣。
The Floormen spin out the connection using the air spinner, or if applicable, the Driller utilises the top drive to spin out the connection.
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