Water Technology and Sciences - November - December, 2014 - page 130

128
Aragón-Aguilar
et al.
,
Comparison of Methodologies to Analyze Decline in the Productivity of Wells
Water
Technology and Sciences.
Vol. V, No. 6, November-December, 2014
Figure 5. Behavior of log (
W
) versus time over the period analyzed for well P5. The data do not fit a straight line and therefore
its decline is not exponencial.
predict trends in the future production of
the well.
Table 1 presents a summary of the
results obtained with the two methods
used in this work-- the type curves method
(Fetkovich, 1980) and normalized flow
(Sanyal
et al
., 1989). The data shown for each
well are: produced mass, type of decline
model, decline rate and transmissivity of
the formation.
The plots in Figure 9 show similar
trends. Figure 9(a) stands out as presenting
a better spread with the logarithmic scale
on the
y
-axis, obtaining a better fit. In
addition, when establishing the minimum
flow limit required, the plot of Figure 9(a)
can be used to determine the useful life of
the well. The decline and normalized flow
trends can be compared with the plot of
the dimensionless normalized flow
Wn
/
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