Historical records on oil, gas, water flowrates, results of formation pressure surveys and flowing pressure (THP or BHP).

The flowrate data is normally available as daily or monthly records of surface flowrates $\begin{array}{l}\{ q_W, \, q_O, \, q_G, \, q_{WI}, q_{GI} \}\end{array}$ :

$\begin{array}{l}q_O(t)\end{array}$	$\begin{array}{l}q_G(t)\end{array}$	$\begin{array}{l}q_W(t)\end{array}$	$\begin{array}{l}q_{WI}(t)\end{array}$	$\begin{array}{l}q_{GI}(t)\end{array}$
oil production	gas production	water production	water injection	gas injection

Fig. 1. Synthetic case of Production/injection History with multiple PDGs

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Production/Injection History

See Also