Oil mud displacement with blast furnace slag/surfactant

Wells – Processes – Cementing – plugging or consolidating

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175 65, E21B 3314

Patent

active

053300068

ABSTRACT:
A cementitious slurry containing blast furnace slag and a surfactant is utilized to displace an oil based drilling fluid without causing contamination by the blast furnace slag cement. In a specific embodiment, a cementitious slurry comprising blast furnace slag, a surfactant and water is used in the cementing of an annulus surrounding a casing or liner wherein a synthetic oil-containing drilling fluid is present.

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