Which plot tests injectivity and is useful for establishing formation behavior during pumping?

Which plot tests injectivity and is useful for establishing formation behavior during pumping?

• A. Darcy Plot
• B. Pressure Build-Up Plot
• C. Packer Performance Plot
• D. Hall Plot

Answer: (D)

Injectivity and how the formation responds to sustained pumping are the focus. The Hall plot is a diagnostic tool used during injection tests to reveal how easily fluid enters the formation and how the near-well region behaves under pumping. By examining the pressure response as fluid is injected, it helps identify near-well permeability, potential formation damage, and how the formation accommodates continued pumping (for example, whether the injectivity changes with time or with flow rate). The other plots are more about permeability estimation from drawdown, pressure buildup after stopping, or equipment performance, and they don’t target injectivity during pumping as directly. So the Hall plot is the best choice for testing injectivity and establishing formation behavior during pumping.

Injectivity and how the formation responds to sustained pumping are the focus. The Hall plot is a diagnostic tool used during injection tests to reveal how easily fluid enters the formation and how the near-well region behaves under pumping. By examining the pressure response as fluid is injected, it helps identify near-well permeability, potential formation damage, and how the formation accommodates continued pumping (for example, whether the injectivity changes with time or with flow rate). The other plots are more about permeability estimation from drawdown, pressure buildup after stopping, or equipment performance, and they don’t target injectivity during pumping as directly. So the Hall plot is the best choice for testing injectivity and establishing formation behavior during pumping.