“downhole motor”的概念、定义、翻译、参考文献-科学参考

单词	downhole motor
释义	downhole motor Encyclopedia 工学钻井装备释 downhole motor井下动力钻具连接在钻铤与钻头之间，随钻柱一起下入井底，驱动钻头旋转破岩的动力机。又称井下马达。理学钻具释 downhole motor孔底动力钻具位于钻柱下部，由钻井液（循环介质）或电力驱动，实现回转、冲击碎岩的钻具。
随便看	soil evaporation pan soil exchangeable acidity soil exchangeable adsorption soil exchangeable base soil exchangeable cations soil exchangeable hydrogen soil exchangeable sodium soil exhaustion soil expansion soil ex-situ remediation soil extract soil farming system soil fauna soil fertility soil fertility grading soil fertility system soil firmness soil flushing soil food web soil forest landscape soil formation processes in China soil-forming weathering crust soil-free turf soil freeze-thaw erosion soil freezing - thawing erosion in China

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