Bamboo West, a heavy oil (API Gravity 18-20) field is located in Muglad basin of south-central Sudan. Field consists of multilayered sandstone reservoirs of late cretaceous age. The reservoirs in this field are highly heterogeneous, thinly bedded, unconsolidated with high viscosity and strong aquifer support. The field is on production since July 2001 and is contributing significantly in the current 300,000 bopd production of Sudan.

Production performance of vertical wells through PCP and ESP suggests that field is facing severe problem of water coning and viscous fingering. Water cut has increased to 68 % in a span of less than 4 years causing decline in well productivity and leaving significant bypassed oil in the reservoir.

Horizontal wells were considered the best solution for improving the well productivity in this thinly bedded heavy oil field with objective for tapping the bypassed oil and delaying the water production while controlling the sand production due to low drawdown pressure and increased exposure to the reservoir.

This paper discusses about identification of bypassed oil, horizontal well placement cycle and dynamic underbalance with oriented perforation techniques that were used in Bamboo West field. A multidisciplinary approach and combination of these techniques used first time in the Middle East, Asia and Africa region resulted in the production of 1800 bopd in a horizontal well (Nearly four times of vertical well) of heavy oil from a reservoir of 0.5m thick with no water and sand production. Paper also emphasizes about different ingredients that are important for making the horizontal well successful in such fields, which can add value to the asset and results into improving the reserves and improvement in overall development strategy of the field.

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