What is displacement efficiency?

Displacement efficiency is a measure of the amount of mobile fluid in the system. In addition to displacement efficiency, recovery efficiency for oil depends on the amount of oil contacted by injected fluids. Areal and vertical sweep efficiencies measure the degree of contact between in situ and injected fluids.

What is macroscopic sweep efficiency?

Macroscopic (sweep) displacement of fluid in a reservoir, E. V. Volumetric efficiency or sweep efficiency is defined as the fraction of the reservoir (pore volume) that is swept or invaded by displacing fluid.

What is sweep efficiency in oil reservoir?

Vertical sweep efficiency is the fraction of vertical cross-sectional area of the reservoir between injection and production wells that is swept by water at a given time. It can be used to estimate and predict the unswept fraction of the reservoir by water injection and the additional oil recovery potential.

What is volumetric sweep efficiency?

Volumetric sweep efficiency is defined as being the fraction of the floodable pore volume swept or contacted by the injected water. Volumetric sweep efficiency is a combination of areal sweep and vertical sweep efficiencies as illustrated in Equation 1.

What is microscopic displacement efficiency?

The microscopic displacement efficiency (ED) relates to the displacement or mobilization of oil at the pore scale. It is a measure of the effectiveness of CO2 miscible slugs to mobilize/displace the oil from pores in the rock where the miscible slug has contacted the oil.

What is the difference between permeability and mobility?

Permeability is the ability of the rock to transmit fluids and it has a dimension of area (the interviewer challenged me by saying that is wrong and i’m afraid he had no idea) and mobility is a property that depends on the fluid which also takes the viscosity of the fluid into account.

What is mobility ratio in reservoir?

Mobility ratio is defined as the mobility of the displacing fluid λD behind the front divided by the mobility of the displaced fluid λd ahead of the front; thus.

How is chemical flooding applied in enhanced oil recovery technique?

Enhanced Oil Recovery Chemical flooding relies on the addition of one or more chemical compounds to an injected fluid either to reduce the interfacial tension between the reservoir oil and the injected fluid or to improve the sweep efficiency of the injected fluid.

What is polymer resistance factor?

The polymer resistance factor (F R ) of a given fluid is the mobility ratio of the brine and polymer. Residual resistance factor (FRR) of a given fluid refers to the ratio of the brine permeability before and after polymer solution flows through the core.

What is polymer injection?

Polymers are long chain molecules composed of many repeated subunits with high molecular weight. When added to water, either as a solution or as powder, they increase the water viscosity. The more viscous polymer-water solution is injected into the reservoir for enhanced oil recovery.

What are the different techniques of EOR?

There are three primary techniques of EOR: gas injection, thermal injection, and chemical injection. Gas injection, which uses gases such as natural gas, nitrogen, or carbon dioxide (CO2), accounts for nearly 60 percent of EOR production in the United States.

What is meant by residual resistance?

[rə′zij·ə·wəl ri′zis·təns] (solid-state physics) The value to which the electrical resistance of a metal drops as the temperature is lowered to near absolute zero, caused by imperfections and impurities in the metal rather than by lattice vibrations.

What is the meaning of EOR?

The term EOR is an acronym for Employer of Record. An EOR is a third-party company that takes over all the employment tasks on behalf of another company.

Why is EOR important?

EOR helps to maximize the oil reserves recovered, extend the life of fields, and increase the recovery factor. It is an important tool for firms helping to maintain production and increasing the returns on older investments.