Page 37 - Well Logging and Formation Evaluation
P. 37

Basics                          27

            • Where does the dynamic model of the reservoir predict the GOC to be?
            • Is the bottomhole pressure below the bubble point? What choke size is
               being used?
            • Are neighboring wells already starting to produce gas?
            • Could the gas be entering from elsewhere in the wellbore (other pro-
               ducing zones, leaks in the tubing, etc.)?
            • What does the relative permeability data from the core indicate the
               relative permeability to oil and gas to be?

               Once the above questions have been answered for the various scenar-
            ios, the petrophysicist will be in a good position to contribute to discus-
            sions regarding remedial actions to be taken. Such actions may include
            any of the following:

            • Further data gathering through the use of production logs
            • Reperforation
            • Acidization
            • Acid or hydraulic fracturing of the reservoir
            • Sealing off of certain zones either chemically or mechanically
            • Modification of the offtake strategy
            • Recompletion
            • Sidetracking of the well
            • Implementation of artificial lift techniques (e.g., gas lift or ESP
               [electric submersible pump])
            • Implementation of a water or gas injection program
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