The calculation of specific productivity index for testing is derived.

Currently,the DST-data-based method of specific productivity index is used to evaluate deliverability in offshore heavy oilfields,which usually lead to too high or too lower results due to using empirical correction coefficients with artificiality.

In consideration of reservoir percolation mechanical theory and productivity evaluating theory of well testing analysis, the concepts of layering percolating flow rate and layering production index are introduced The layering productivity evaluating principles and methods are described The application example shows that the evaluating result is basically consistent with the productio

The relationships between productivity index and producing pressure drop of the producing wells of different producing formation patterns are established through studying the change of oil producing capacity of the producing wel.

Based on the theory of energy balance for liquid at pseudo-steady state, the paper establishes a new mathematic method of determining productivity index and reservoir pressure of oil wells that creates the objective function by using correspondence of surface performance data and unknown formation parameters which increases the practicability of the model greatly.

The relationship of productivity index and inflow performance of steam drive wells is established based on compound reservoir model of different heated area of wells in steam drive pattern.