Question

A well flowing 40%water(viscosity=0.5cP, and FVF=1) and 60% oil(viscosity=4cP and FVF=1.5 from 30-ft thick reservoir. Core analysis indicate the permeability to be 305md. Estimate the productivity index of this well. Assume relative permeability to 0.25 for oil 0.15 for water.

Answer 1

The productivity index is a measure of the well potential or ability to produce and is a commonly measured well property.

A labor productivity index can be calculated by dividing an index of output by an index of hours worked. When more than one index is included in a calculation, all the indexes must have the same base period.

$P.I = 100 × \dfrac{\textsf{present productivity}}{\textsf{base productivity}}$

$= 100 ×0.15/0.25 = 60$