W Waterflooding at “X” Field has been done since August 2013. In 2013, the injection has been fully implemented and there are 4 injection wells where the water injected through tubing and annulus. Waterflooding is used to push the remaining oil in the reservoir so that the oil can be produced. Evaluations are needed to determine the result of waterflooding. In this final assignment, there are three methods that will be used to evaluate the waterflooding, they are the Hall Plot method to evaluate injection well condition, the Buckley-Leverett method to equate water breakthrough time from an injection well to production well. Then the Pattern & Balance method to determine the injector capacity. Here are the results from each evaluation. Evaluation with Hall Plot method shown that most of the wells are stable. The fastest water breakthrough time is 229 days and the longest one is 6752 days. Injector capacity in four wells are more and in three wells are less than calculated, so need to do some adjustment in injector capacity.