...Because it has a faster setting and hardening rate than high-early-strength Portland cement, it is used in cold weather construction and in extreme emergency construction. When pumped underground as a slurry, oil well cement must not lose its fluidity until the pumping is complete, and must harden quickly after the pumping is complete. The deeper underground, the higher the temperature becomes and the longer it takes to pump, so different cements are used depending on the depth. ... *Some of the terminology that refers to "oil well cement" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…早強ポルトランドセメントより凝結強化速度が大きいため,寒冷時の施工,超緊急用工事に用いられている。オイルウェル(油井)セメントは,スラリーとして地下まで圧送する際,圧送が終了するまでは流動性を失わず,終了後は速やかに硬化しなければならない。地下深くなるほど温度が上昇するし,圧送時間がかかるため,深さによって用いられるセメントが異なる。… ※「オイルウェルセメント」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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