What process is used to gather the bottom of the oil wells after secondary production?Primary productionTertiary productionSecondary production

The process used to gather the bottom of the oil wells after secondary production is known as tertiary production (also referred to as enhanced oil recovery).

Explanation:

1. Primary Production: This is the initial stage of oil extraction when the pressure of the oil reservoir drives the oil to the surface. It typically relies on natural reservoir pressure and may involve pumps but does not require any additional techniques.

2. Secondary Production: This phase involves methods that are used to increase oil flow from the reservoir after the primary phase has declined. Common techniques include injecting water or gas to maintain pressure in the reservoir.

3. Tertiary Production (Enhanced Oil Recovery): After the secondary recovery phase, it may still be possible to extract additional oil. Tertiary production employs advanced techniques, such as thermal recovery (injecting steam), gas injection (using gases like CO2), or chemical flooding (using surfactants). These methods aim to change the properties of the oil or the reservoir to extract more oil.

In summary, after secondary production, the tertiary production process is utilized to extract remaining oil from the well.