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Drawdown survey (DD)

Created by Arthur Aslanyan (Nafta College), last modified on Aug 17, 2018

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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):

Fig 1. Drawdown pressure decline (blue dots) for 2,300 hrs after opening the well for production at 100 m³/d.

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

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