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.
另一方面使水泥浆具有防窜性，减轻了地层流体对水泥环的侵蚀。
It can reduce cement slurry filtration, provide a channeling-preventing effect and mitigate corrosion of formation fluids on cement ring.
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