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In March 2010, Dong Do field was discovered by appraisal well DD-3X drilled in the central part of BII.2.20 reservoir. Based on the oil type classification, hydrocarbon in Dong Do field is near a heavy oil zone, which has 20o API gravity and 17 cP viscosity. The question how to develop this heavy oil at maximum recovery rate and lowest cost was raised from early. Using the ESP lift system to produce heavy oil from only one formation is a preferable concept for this marginal field development with high challenges. Summary

Production technology solutions to enhance heavy oil recovery of marginal fields, offshore Vietnam