Study reveals variables that affect cement-plug stability

02/21/2000
A recent operating-service company study provides greater understanding of slurry movement after placement in the wellbore.This work provides an improved explanation of the relationships between cement-plug stability and the following factors:Wellbore angle-vertical, horizontal, or deviated.Spotting fluids and wellbore fluid rheologies and densities.Hole diameter.Cement-plug instability can be attributed to specific slurry movements, such as the Boycott effect, in which heavier fluids slide as a mass to the lower side of an inclined borehole.Thus, the knowledge acquired from this study should allow drilling personnel better to tailor cement-plug designs for specific hole conditions.Previo...
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