Acid proved an efficient near wellbore skin damage removing agent in carbonate production and injection wells. Nevertheless, improving acid stimulation design is a continuous need in oil industry. Formation analysis logs for some of South Ghawar power water injectors have shown a significant amount of residual oil dominating the open hole interval. This phenomenon results in wells transmissibility reduction, which reflects negatively on injection rate.

A unique type of de-paraffin organic solvent was recently introduced to acid treatment design in South Ghawar PWIs to tackle injection impediment caused by high irreducible oil saturation. This solvent demonstrated a great capability in removing and flushing off residual oil, wax and asphaltene deposits in the reservoir matrix. Adding this solvent to pre-flush the rock enhanced the main acid treatment propagation into the reservoir, as well as water injection afterwards.

This paper presents the influence of the organic solvent on some of South Ghawar horizontal and vertical PWIs performance after acid treatment. It will also compare the injectivity of wells — with similar parameters and properties — that were acidized without adding this organic solvent in treatment. Differences in results due to modification of this product will also be discussed.

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