In my experience using Hall-Plot technique is the best for me to know the condition and the performance of water injection well. Pleas see the figure below
One comment from me is for the trend like on the D-positife skin/poor water quality can be also caused by the reservoir pressure increaseing or in other word the reservoir is over pressure condition. As you can imagine if the reservoir pressure increase due to some reason like (low reaservoir permeability or small reservoir tank capacity it will create back pressure to the bottom hole injection pressure, so then also impact
to the surface injection pressure.
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