SPECIAL REPORT: CO2 overcomes sandstone acidizing problems

Carbon dioxide (CO2) pumped ahead of an acid treatment preconditions the formation and overcomes sandstone acidizing problems that may occur with conventional treatments.Conventional treatments can have problems such as stimulating water preferentially, inadequately removing damage, and often causing significant upsets in demulsification facilities because of spent-acid returns.1CO2-acidizing jobs should include enough CO2 to completely displace resident crude oil from the zone to be contacted by acid.Sandstone acidizingThere is a fundamental difference between sandstone and carbonate acidizing. In the latter treatment, hydrochloric acid dissolves carbonates into products that are soluble...

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