在钻井过程中，井筒泥浆柱压力和地层压力的不平衡使得泥浆滤液不断渗入地层。
During the drilling procedure, the mud filtrates continuously penetrate into the formation because of the unbalance between the mud column pressure in the borehole and formation pressure.
如果一个稳定的泥浆柱能在油井里成型，并通过它十足的压力将石油限制在海湾范围，那下一步就是将井里的泥浆粘合好，使油井永久封闭。
If a stable column of mud has been set up in the well, keeping the oil at bay through its sheer weight, the next step would be to set cement in the well and seal it off permanently.
水泥浆的有效浆柱压力是在初凝前还是在初凝后降低至水柱压力，直接关系到能不能在固井候凝过程中压稳地层流体、实现压稳防窜候凝。
The time when the cement slurry's column pressure reduces to the water column pressure before or after initial set is directly related to whether or not formation fluids flow out during wait-on-time.
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