Accurately distinguishing the flow regime of the liquid in well is very important for optimizing drilling design and operation and guaranteeing cement replacement quality.
准确判另井内液体的流态，对钻井优化设计和施工、保证注水泥顶替质量是非常重要的。
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For the conventional cement base surface, liquid curing agent for sealing, can enhance the surface wear resistance, strength and impermeability, prolong the service life of ground and using effect.
Extracting alumina from coal refuse, sintering cement clinker directly from residues and circulating waste gas and liquid is a unusual technology for utilization of coal refuse.