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Wellbore phenomena, the topic of this chapter, and near-wellbore phenomena, to be discussed in Chapter 10 , both have significant influence on the pressure response during a pressure-transient test. However, unlike near-wellbore phenomena, wellbore phenomena are rarely important during production. The task of the analyst is to identify the cause of wellbore phenomena to determine whether to ignore, and if not, how to account for, the effect of the phenomena on the pressure response.

Section 9.2 discusses a variety of situations that can cause a changing wellbore-storage (WBS) coefficient. These include an abrupt change in WBS coefficient, phase segregation, thermal effects, and compression of a gas column above a rising liquid level.

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