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Injects surfactants to lower the surface tension between water and oil, facilitating the release of oil trapped in the reservoir rock.

A thermal EOR technique where oxygen is injected to ignite a portion of the reservoir oil in-situ; the heat generated reduces viscosity and pushes oil towards production wells.

The injection of gas with surfactants to form foam, which improves sweep efficiency by reducing gas channeling through the reservoir.

Involves introduction of heat to reduce oil viscosity, making it easier to produce. Common methods include steam injection and combustion.

Ignites and burns a portion of the reservoir's oil in place, using the generated heat to reduce the viscosity of the remaining oil and drive it towards the production well.

Injection of solvents such as ethane, propane, and butane to reduce oil viscosity and improve recovery by facilitating oil flow towards the well.

Involves injection of chemicals like polymers, surfactants, or alkalis to improve oil displacement efficiency and decrease interfacial tension.

Injection of carbon dioxide, which can dissolve in oil to lower its viscosity and increase its volume, aiding recovery and sequestering carbon.

Injection of water with lower salt concentration compared to reservoir water, which can lead to changes in rock wettability and improved oil recovery.

Involves the use of microorganisms or their metabolites to aid in the recovery of oil that cannot be retrieved by conventional methods.

Alternate injection and production phases using CO2, allowing the gas to mix with and mobilize the oil; similar to cyclic steam stimulation but with CO2.

Uses nitrogen gas to maintain reservoir pressure and displace oil towards the production wells, often used in reservoirs where CO2 might react with the oil or rock.

Specialized EOR methods for the recovery of heavy crude oil, often involving thermal techniques to improve the fluidity of the oil.

Injection of alkaline substances like sodium carbonate to create in-situ surfactants which can reduce oil-water interfacial tension.

Injection of water to displace oil and drive it to a production wellbore, enhancing oil recovery after primary methods slow down.

This method injects water-soluble polymers to increase the viscosity of the displacing water and improve sweep efficiency.

Introduces steam to raise the temperature and lower the viscosity of the oil, making it easier to extract; common techniques include cyclic steam stimulation and steam assisted gravity drainage (SAGD).

The process of injecting light hydrocarbons (e.g., methane, ethane) into the reservoir to increase oil recovery by reducing oil viscosity and improving miscibility.

Utilizes a plasma pulse to create pressure waves in the wellbore, reducing skin effect and improving oil flow without the use of chemicals.