CO2 Injection was first tried in 1972 in Scurry County, Texas. In which category of EOR does this technique fall?

CO2 Injection was first tried in 1972 in Scurry County, Texas. In which category of EOR does this technique fall?

• A. Gas injection
• B. CO2 Injection
• C. Thermal Recovery
• D. Chemical Injection

Answer: (B)

In enhanced oil recovery, methods are grouped into three broad families: thermal recovery (using heat to lower oil viscosity), chemical injection (using polymers or surfactants to improve displacement), and gas injection (using a gas to push oil toward the producing wells). CO2 injection is a specific form of gas injection that uses carbon dioxide to displace oil. It was first tried in 1972 in Scurry County, Texas, highlighting how CO2 can interact with reservoir oil—often becoming miscible at sufficient pressure, which helps swell and reduce oil viscosity to improve displacement and sweep efficiency. Because this technique relies on a gas rather than heat or chemicals, it fits the CO2 injection category rather than thermal or chemical methods.

In enhanced oil recovery, methods are grouped into three broad families: thermal recovery (using heat to lower oil viscosity), chemical injection (using polymers or surfactants to improve displacement), and gas injection (using a gas to push oil toward the producing wells). CO2 injection is a specific form of gas injection that uses carbon dioxide to displace oil. It was first tried in 1972 in Scurry County, Texas, highlighting how CO2 can interact with reservoir oil—often becoming miscible at sufficient pressure, which helps swell and reduce oil viscosity to improve displacement and sweep efficiency. Because this technique relies on a gas rather than heat or chemicals, it fits the CO2 injection category rather than thermal or chemical methods.