Mineralogy-based acid design restores sandstone productivity

06/21/2004
The selection process of candidate wells for acidizing treatments in sandstones must identify relevant damage mechanisms and mineralogy-driven remediation options. A combination of production logging and geophysical analyses, coupled with reservoir simulation, is insufficient for selecting the candidate wells, as shown by results from wells in the South China Sea,In these wells, sandstone formations with an average 20% carbonate content are not good candidates for treatments that include hydrofluoric (HF) acid because the acid may cause severe secondary and tertiary precipitation that can reduce productivity.Treatments with a nonhydrofluric acid, however, proved effective for restoring pr...
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