Reservoir properties distribution for a typical reservoir within the pay thickness interval 10653 -10686ft is given in below. A cut-off permeability of 20 mD was applied throughout the distribution. Reservoir pressure and bottomhole pressures are 3000 psia and 2000 psia respectively. Wellbore and external drainage radius are 0.3 ft and 2500 ft while oil viscosity is 2.5 cP. Calculate the following:

1. 1. Production rate (bbl/day)
   2. Productivity index (PI), if the pressure drawdown is 800 psia. (15 Marks)

 

Permeability values for depth interval 10653-10686 ft

 

Depth Interval (ft)	Permeability (mD)
10653 – 10657	58
10657 – 10663	18
10663 – 10669	55
10669 – 10675	65
10675 – 10680	70
10680 – 10686	72