The Use of Specialized Cement to Ensure Long Term Zonal Isolation for Sour Wells in South Oman

Petroleum Development Oman (PDO) is drilling sour reservoir wells in the south of Oman. The challenge for these wells is that the completions are suffering from an iron sulfide scale formation during the production stage. Iron sulfide scale precipitation occurs from the reaction of hydrogen sulfide (H2S) and iron oxide (hematite or other metals oxides). The latter is usually used in the high density conventional cement slurries to cement the liner across the reservoir intervals.