Eleven mare moaes of tool joint tailures are summarized. 綜述了石油鉆桿接頭失效的十一種主要形式。
The new assembly can make the joint of the polished rod pass through, therefore can meet the need of new oil production technology. 這種密封盒可以使比光桿桿體直徑大得多的光桿接頭通過(guò)，能滿(mǎn)足新的采油工藝需要。
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