This paper describes a methodology to optimize the performance of water injection and its surveillance parameters during implementation. The main objective is to increase oil production in Casabe, a mature field located in Colombia.

Waterflooding as a secondary recovery method started in 1985 in Casabe field, and this strategy has been followed until present time. Casabe is a complex mature field, which presents challenges related to a high heterogeneous nature, limited sand continuity, unfavorable mobility for the ongoing waterflooding process, and high sediment production due to a poor consolidation of the reservoir.

During the last 2 years, the field has experienced an increment of water cut, high production decline, and instability. Therefore, it is necessary to do a more detailed analysis to identify and flood those reservoirs with high remaining oil and stop injecting those with high water saturation.

Surveillance of the process during water injection optimization was a key part of the implementation. Choosing the right technology or workflow to achieve water injection rates, monitoring pressure in target reservoirs, minimizing sediment production, and performing production logging tests for production by reservoir were essential to evaluate the methodology.

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