Pressure transient survey in producer during the pressure fall period caused by opening well for production or increasing its production rate (see Fig. 1):
Fig 1. Drawdown starting after well is closed at 3,600 hrs and going through pressure recovering for 7 days (blue dots). The grey dash line shows bottom hole pressure history before 3,600 hrs in case it would have been recorded. |
Interpretation
Interpretation of DD is based on:
- visual analysis of PTA diagnostic plot
- selecting pressure diffusion model from PTA Type Library
- fitting selected parameters of pressure diffusion model to pressure gauge data records