| Excerpt |
|---|
Pressure transient survey in injector during the pressure rise period caused by opening well for injection or increasing its injection rate |
(see Fig. 1)
...
.
Despite the terminology conflict the Injection survey is widely called Drawdown (DD) similar to producing wells.
 |
Fig 1. |
...
...
Interpretation
...
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 pressure gauge data records (see Fig. 2)
|
|
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
...
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Well Testing / Pressure Testing
[ Pressure Transient Analysis (PTA) ][ Pressure Build-Up (PBU) = Build-Up Survey (BUS) ][ Drawdown survey (DD) ]