Gas lift vs rod-pump lift: which describes gas lift and its suitability?

• A. Gas lift injects gas at the tubing to reduce hydrostatic pressure and lift fluids; gas lift suits deep wells and high gas content.
• B. Gas lift uses a surface-driven pump to physically lift fluids from depth.
• C. Gas lift and rod-pump are the same process.
• D. Rod-pump is more suitable for deep wells with very high gas content.

Answer: (A)

Gas lift works by injecting gas into the well to lighten the liquid column. When gas enters the production string, it forms bubbles that replace part of the liquid’s weight, reducing hydrostatic pressure and allowing the fluids to rise to the surface more easily. This makes gas lift especially effective for deep wells and wells with high gas content, where the dense column would otherwise resist lifting. The system is flexible because you can adjust the gas rate and valve settings to match depth and fluid properties, and it doesn’t depend on a mechanical downhole pump, which helps reduce wear and maintenance.

The other descriptions don’t fit the concept: a surface-driven pump is not what gas lift uses, since there’s no primary pumping action at the surface lifting the fluid; gas lift is not the same process as a rod-pump, which relies on a downhole mechanical pump; and while rod-pumps work in many wells, they’re not the best choice for very deep wells with high gas content due to gas locking and efficiency issues.