Formation damage was simulated by injecting completion fluid into cores and conditioning at 380°F (193°C) overnight. Low hydrofluoric (HF) acid concentrations from 0.05- to 0.1% blended with 10% acetic (HAc) effectively removed the damage. Some other acid systems we tested also worked well. Acidizing did not reduce the measured compressive strengths of the cores; however, microscopic analyses showed layers within the cores may have been seriously weakened.

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