Compute rates and cumulative production values for Arps exponential decline curves.
initial rate [volume / time], i.e. q(t = 0).
nominal Arps decline exponent [1 / time].
time at which to evaluate rate or cumulative [time].
Assumes consistent units of time between
t. To convert, see the decline-rate conversion functions referenced below.
exponential.q returns the rate for each element of
in the same units as
exponential.Np returns the cumulative production for each element of
t, in the same units as
qi * t.
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