Abstract: The technique of the conversion of drilling fluid into cement is called MTC technique for short.In this paper,the self-made dispersant F-2,organic slow dilution agent,early strength agent and activator are sieved by MTC composition.MTC is successfully convert-ed in laboratiory at different temperature.The in-situ mud test in Liaohe Oil Field shows
that due to the composition,the strength of the converted cementstone is greater than 10 Mpa in three days,and its rheological property and viscosifying time can satisfy the re-quirements of cementing.

Key words: Drilling fluid, Cement milk, Treating agent, Strenth, Rheological proper-ty, Viscosifying time