Slurry displacement efficiency is an important stage to improve cementing quality,but there is not any methods, which can displace mud,especia1ly mud cake from borehole comp1etely before now.

• 替净是提高固井质量的一个重要前提。然而目前所具有的方法，还不能将钻井液，尤其是不能把滤饼清除干净，严重影响了水泥环的胶结强度。