Abstract:
After the beginning of production, pressure transients propagate outwardly
towards the reservoir boundary that changes the pressure around. This introduces
the concept of radius of drainage and time to stabilization of a reservoir, The
pressure change at the wellbore would be felt at least infinitesimally everywhere
in the reservoir. Many authors have defined the radius of drainage and time to
stabilization, based on different criterion values that is the percentage of pressure
change or flow rate is compared to wellbore condition. The primary objectives of
this study are to recognize and evaluate the importance of criterion values for
defining the radius of drainage and time to stabilization.
A correlation has been proposed that will allow one to determine the radius of
drainage as a function of criterion values. The relationship between a pressure
criterion and the corresponding rate criterion has also been established. As
expected, an estimated value of the radius of drainage varies considerably
depending on the suggested criterion
The time required to reach the stabilized condition for any reservoir is infinite. In
this study an stabilized condition has been defined as that time at which the rate of
declining pressure at the well bore becomes negligible. This has lead to
generalized fonns oftime to stabilization correlations.
