FLUSHED ZONE PROCESS HELPS CONTROL GAS MIGRATION IN PRIMARY CEMENTING

Robert R. Teichrob Husky Oil Operations Ltd. Calgary Gas migration during cementing operations can G be eliminated with optimal drilling practices and ultra-high filtrate loss drilling fluids or properly designed squeeze fluids. A method based on the flushed zone theory involves squeezing fluid into a potential gas-bearing formation to reduce the permeability to gas near the well bore. The process aims to suppress gas flow long enough for the cement to set.

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