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In order to enhance oil recovery, supercritical CO 2  (scCO 2 ) flooding has been applied in many oilfields to extract oil and gas post primary recovery. However, it causes serious scaling problems in the reservoir, oil well and production tubing. In this article, the produced water quality before and after scCO 2  flooding in carbonate reservoirs are analyzed. The scaling trend of produced water before and after scCO 2  flooding was calculated by using the Davis-stiff saturation index and Ryznar stability index methods. Static experiments and scanning electron microscope (SEM) are used to study the scale inhibition performance and mechanism of HEDP, ATMP, MA-AA, and PAA on CaCO 3  in produced water before and after scCO 2  flooding. The results show that after scCO 2  flooding, the quality of produced water changes obviously, thus the scaling trend of produced water increases, the growth of CaCO 3  crystal is affected and the scale inhibition efficiency of conventional scale inhibitors decreases.

Effect of supercritical CO 2 flooding on the produced water quality and performance of the scale inhibitors in a typical tight sandstone oilfield