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水泥浆滤失受到井壁内外泥饼及不同渗透率岩心的阻挡作用，其失水量比ＡＰＩ标准所测数值小很多，当水泥浆ＡＰＩ失水量为２５０ｍＬ／３０ｍｉｎ×７ＭＰａ时，模拟井下的实际失水量约为７～１２ｍＬ／３０ｍｉｎ×７ＭＰａ。因此，在注水泥时，较大的水泥浆失水不会造成系压的急剧增高；也不会在水泥浆凝结过程中形成桥堵，引起油、气、水窜及损害油、气层等问题。水泥浆失水的主要作用，在于保持一个良好、稳定、自由水少的水泥浆体系，使水泥石均匀地分布在环形空间内，既提高了水泥环质量，对防止气窜也有好处。
The loss of cement slurry is blocked by mud cake and cores with different permeability inside and outside the wellbore. The water loss is much smaller than that measured by the API standard. When the water loss of cement slurry API is 250mL / 30min × 7MPa, The amount of water is about 7 ~ 12mL / 30min × 7MPa. Therefore, when cement is injected, large water loss of cement slurry will not cause a drastic increase of the system pressure, nor will it form a bridge in the process of cement slurry coagulation, causing oil, gas and water channeling and damaging oil and gas layers problem. The main function of water loss of cement slurry is to maintain a good, stable and free water slurry system, so that the cement evenly distributed in the annular space, not only improve the quality of the cement ring, gas channeling is also beneficial to prevent.