Study On Reinjection Technology of Sewage With SO42+ in Oilfield

ZHANG Dong, WU Wenxiang


SO42- rich in reinjection sewage combined with Ca2+, Mg2+ in formation water to form precipitate which results clogging in the formation pore. Ion exchange method was chosen to remove SO42- in reinjection sewage and the anion exchange resin with OH- is selected as the exchange medium. It is necessary to evaluate alkali sensitivity of the formation rock due to the reinjection of sewage containing excess OH-. The results indicate that ion exchange method can remove more than 90% of the SO42+ and the rate of formation damage is negligible when the pH below the critical of 9.8.

Key words: SO42-; Ion exchange method; Scaling; Alkali sensitivity


SO42+; Ion exchange method; Scaling; Alkali sensitivity

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