The structural characters of steel pipe drilling rod, the signification of welding repair for the rods and the narrow gap welding process and equipment are introduced in the paper.

介绍了钻铤钢管的结构特点、焊接修复的意义，以及窄间隙焊接工艺与设备。

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The friction caused by the gas bubble pushing up the pipe and displacing the drilling mud used to control the pressure could have created a static charge that ignited the gas into a fireball.

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Inside the riser pipe is a space about half a meter in diameter, large enough to hold the spinning drill pipe and bit and to allow the return flow of drilling fluid.

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Drilling holes every few dozen yards and pulling up pipe-shaped samples still leaves acres of mystery.

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