Fault Block M is a reservoir package consisting of three major sand layers, A, B and C, with C being the best sand in terms of reservoir properties and continuity, followed by B and A. Fault Block M was developed with water injection through commingling of eight oil producers and three water injectors. In 2012, five more wells were drilled to improve reservoir recovery. In view of a fresh reservoir understanding, the team embarked on a full scale data acquisition including quarterly pressure survey and production logging campaign in 2015 and 2016 to determine sands layer pressure and flow distribution for both producers and injectors. Based on better reservoir understanding, many replications of low cost water shut-off have been conducted, which resulted in the field achieving its highest daily production since the infill campaign in 2012. The ratio of data acquisition and well intervention costs to revenue gain has proven to be low, a perfect production enhancement solution for the current low oil price scenario.

This paper reviews how production logging tool helps in reservoir surveillance and production allocation. While commingling production and injection is cheaper in development sense, commingling sand of difference in quality should be done with great care and strategy. While chasing the barrels, periodic data acquisition is crucial thus shouldn't be neglected to ensure correct understanding of production behaviour and RMP requirement.

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