在下入表层套管且注水泥之前，方井同样接受从井眼内返出的、必须被泵回到地表泥浆设备中的泥浆。
Prior to setting surface casing, the cellar also takes mud returns from the well, which are pumped back to the surface mud equipment.
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。
Multistage cementing is used for long casing strings to reduce pump pressures and to reduce pressure on the formations.
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