Multistage cementing is used for long casing strings to reduce pump pressures and to reduce pressure on the formations.
多级注水泥用于长套管柱，以降低泵压并降低作用于地层的压力。
During the primary cementing process, usually we pump some fluid with special technical performance between mud and cement slurries. It is called ahead fluid.
在油气井注水泥作业中，常常需要在水泥浆与泥浆之间注入一段具有特殊技术性能流体，这段流体就称为前置液。
The pump-down opening plug is used for continuous cementing operation and in deviated Wells.
顶替型打开塞用于连续式双级注水泥作业，也适用与在斜井中使用。
The pump-down opening plug is used for continuous cementing operation and in deviated Wells.
顶替型打开塞用于连续式双级注水泥作业，也适用与在斜井中使用。
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