Abstract

Mumbai High is one of the major offshore oil fields in India. The field was discovered in 1974 and consists of multilayered carbonate reservoirs, with substantial heterogeneities among the layers. As the field is maturing, the reservoir pressure is depleting, water production is increasing and hence, the recovery of the remaining reserves becomes more challenging. Most of the wells are either multilayered or horizontal/multilateral wells completed barefoot or with un-cemented perforated liners. Matrix acidization is the dominant stimulation technique for improving/maintaining production. However, preferential stimulation of high permeable streaks is a common issue in multilayered wells. Stimulation of horizontal and multilateral wells, especially not accessible to Coiled Tubing is another concern with respect to the exposure of stimulation fluids in entire horizontal section. Wettability alteration also suspected to be the potential problem in few wells