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WFP is performed on stabilised flow and does not cover transient behavior which is normally covered in Well TestsTesting domain.
The flow is called stabilised if the well productivity index is not changing over time.
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| for producer |
| for injector |
| LaTeX Math Inline |
|---|
| body | q=q_{\rm liq}=q_o+q_w |
|---|
|
| for oil producer |
| for gas producer or injector |
| for water injector or water-supply producer |
Despite of terminologival similarity there is a big difference in the productivity definition and productivity analysis between WFP and Well Testing which is summarized in the table below:
| WFP | Well Testing |
|---|
| Formation pressure | – field-average pressure within the drainage area
| – pressure value at boudary of the drainage area
|
| Flow rate | | | LaTeX Math Inline |
|---|
| body | q_t = B_w \, q_W + \frac{B_o - R_s B_g}{1 - R_v R_s} \, q_O + \frac{B_g - R_v B_o}{1 - R_v R_s} \, q_G |
|---|
|
– total flowrate at sandface |
Для однопластовой залежи со слабосжимаемым флюидом продуктивность не зависит от дебита
и график ИКС представляет собой прямую линию (Рис. 1).
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