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Pressure transient survey in producer during the pressure fall period caused by opening well for production or increasing its production rate |
(see Fig. 1):.
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Fig 1. Drawdown |
pressure decline (blue dots) |
for 2,300 hrs after opening the well for production at 100 m3/d. |
Interpretation
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Interpretation of DD is based on:
- visual analysis of PTA diagnostic plot (see Fig. 1)
- selecting pressure diffusion model from PTA Type Library
- fitting selected parameters of pressure diffusion model to to pressure gauge data records
- records (see Fig. 2)
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Fig. 1. PTA Diagnostic Plot for vertical well in single-layer homogeneous reservoir with impermeable circle boundary (PSS). Gauge pressure is in blue and log-derivative is in red. | Fig. 2. Pressure diffusion model fitting to pressure gauge data. Gauge pressure is in blue and log-derivative is in red. |
See Also
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Petroleum Industry / Upstream / Subsurface E&P Disciplines / Well Testing / Pressure Testing / Pressure Transient Analysis (PTA)
[ Pressure Transient Analysis (PTA) ][ Pressure Build-Up (PBU) = Build-Up Survey (BUS) ][ Injection survey ]In some cases one can uses Horner model with simplified version of DD interpretation procedure.