Adel M. Hemeida, Ahmed A. Gawish


Completion and workover fluids are invading into the producing zone causing formation damage. This damage may be induced due to precipitation of some solid particles suspended in workover fluids or incompatibility of workover fluids with producing formation, formation water and crude oil. Therefore, brines are commonly used as workover fluids. In the present work, a laboratory study was carried out to investigate the effect of employing some workover fluids on formation permeability. Workover fluids used were 8.5 ppg low density calcium chloride brine, 14.5 ppg high density calcium chloride/calcium bromide brine, low density brine with 0.3% surfactant and high density brine with 0.3% surfactant (Petronate). Results showed that damage may be reduced when low density calcium chloride fluids are used. Also, the addition of surfactant (Petronate) to the workover fluids can improve formation permeability and reducing formation damage.

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