Abstract:
The concept of skin and formation damage play a vital role in productivity
of an oil well. The objective of this study is to introduce the effect of skin into the
well flowing equation in transient state. The effect of formation damage zone on the
well flowing pressure was introduced to the original solution of diffusivity equation
by considering three scenarios. In the first scenario it was assumed that oil is
flowing through the reservoir with average (effective) permeability. In the second
scenario it was assumed that the oil is flowing with the permeability of reservoir till
the boundary of formation damage zone and within the altered zone, oil is flowing
with the permeability of damage zone. The third scenario is similar to the second
scenario, however it was assumed that the oil is flowing within the altered zone
with an average permeability. By considering the difference between calculated
reservoir permeability for all three scenarios and assumed values, scenario three
was selected as the most suitable way to introduce the effect of skin in to the well
flowing equation in transient condition.
