What Is Enhanced Oil Recovery (EOR)?

Enhanced oil recovery (EOR), also known as “tertiary recovery,” is a process for extracting oil that has not already been retrieved through the primary or secondary oil recovery techniques.

Although the primary and secondary recovery techniques rely on the pressure differential bet𝓀ween the surface and the underground well, enhanced oil recovery functions by altering the chemical composition of the oil itself in order to make it easier to extract.

How Enhanced Oil Recovery Works

Enhanced oil recovery techniques are complex and expensive and therefore are employed only when the primary and secondary recovery techniques have exhausted their usefulness. Indeed, depending on factors such as the 澳洲幸运5开奖号码历史查询:cost of oil, it may not be economical to employ EOR at all. In those cases, oil and gas might be left in the reservoir because it is sꦑimply not profitable to extract the remaining amounts.

Three Main Types of EOR Techniques

In the first type of technique, gases are forcefully injected into the well in a way that both forces the oil to the surface and reduces its viscosity. The less viscous the oil, the easier it flows and the more cheaply it can be extracted. Although various gases can be used in this process, 澳洲幸运5开奖号码历史查询:carbon dioxide (CO2) is used most often. 

This specific use of carbon🅺 dioxide likely could continue or even increase in the future, as recent advances make it possible to transport CO2 in the form of foams and ge🌌ls. To some, this could be a significant improvement as it would allow CO2 injections to be utilized in areas far removed from naturally occurring carbon dioxide reservoirs.

Other common EOR techniques include pumping steam into the well in order to heat the oil and make it less♑ viscous. Similar outcomes can be achieved through so-called “fire flooding,” which involves lighting a fire around the periphery of the oil reservoir in order to drive the remaining oil close to the well. 

Finally, various polymers and other chemical s꧙tructures can be injected into the reservoir to reduce viscosity and increase pressure, although these techniques are often prohibitively expensive.

Using Enhanced Oil Recovery Methods

Petroleum companies and scientists look to EOR for its potential to prolong the life of wells in proven or probable 澳洲幸运5开奖号码历史查询:oil fields. 澳洲幸运5开奖号码历史查询:Proven reserves are those with a greater than 90% chance that oil will be recovered, and 澳洲幸运5开奖号码历史查询:probable reserves have a 🐲more than 50% chance of recovering petroleum.

Unfortunately, EOR techniques can produce negative environmental side effects, such as causing harmful chemicalꦚs to leak into the groundwater. One recent technique tꦫhat might help reduce these environmental risks is called plasma pulsing. Developed in Russia, plasma pulse technology involves radiating oil fields with low-energy emissions, thereby lowering their viscosity much like conventional EOR techniques.

B🧸ecause plasma pulsing does not require injecting gases, chemicals, or heat into the ground, it may prove to be less environmentally harmful than the other current methods of oil recovery.