Bilogarithmic plot of WOR and its derivative WOR' against the elapsed time $\begin{array}{l}t\end{array}$ (see Fig. 1).

It shows different characteristic trends for different water production mechanisms.

Fig. 1. WOR and WOR' against the elapsed time $\begin{array}{l}t\end{array}$ .


Fig. 2.1. Matrix water invasion	Fig. 2.2. Bottom water coning


Fig. 2.3. Matrix water invasion with late-time channeling	Fig. 2.4. Bottom water coning with late-time channeling

References

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