derrick head 中文意思是什麼
derrick head
解釋
吊桿端吊桿頭-
Shipbiulding ; derrick head fittings, fixed type ; identical with iso 8148, edition 1985
造船.固定吊桿眼板.與iso 8148 1985版本等同 -
Since the deeper the well, the higher the lifting force at the upper drill string, the deviation of derrick and the well head ' s eccentricity should be avoided by all means to prevent the severe eccentric wear on the casing which is caused by excessive effective eccentricity
由於上部鉆柱的提升力隨井深的增加而增加,因此應當盡量避免井口偏心或井架安裝不正,防止有效偏心距過大而造成近井口套管的嚴重偏磨。
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