What is sweep efficiency in oil and gas?

What is sweep efficiency in oil and gas?

1. n. [Enhanced Oil Recovery] A measure of the effectiveness of an enhanced oil recovery process that depends on the volume of the reservoir contacted by the injected fluid.

What is a sweep in oil field?

Sweep is a mud which has higher rheology and/or more mud weight than current mud property. It is used to carry cutting that set at low side of a wellbore and it is widely used for Sea water drilling.

What is a 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 a areal sweep efficiency?

1. n. [Enhanced Oil Recovery] In a reservoir waterflood or other fluid injection using a well pattern, the fraction of the pattern area from which reservoir fluid is displaced by the injected phase at the time of breakthrough.

What is microscopic sweep 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 infill drilling?

1. n. [Enhanced Oil Recovery] The addition of wells in a field that decreases average well spacing. This practice both accelerates expected recovery and increases estimated ultimate recovery in heterogeneous reservoirs by improving the continuity between injectors and producers.

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.

How does gas lift work?

Gas lift is a method of artificial lift that uses an external source of high-pressure gas for supplementing formation gas to lift the well fluids. The principle of gas lift is that gas injected into the tubing reduces the density of the fluids in the tubing, and the bubbles have a “scrubbing” action on the liquids.

What is mobility ratio?

Mobility ratio is defined as the mobility of displacing fluid (gas) divided by the mobility of displaced fluid (crude oil).

What factors effect the microscopic sweep efficiency?

The microscopic displacement efficiency is affected by the following factors: interfacial and surface tension forces, wettability, capillary pressure, and relative permeability.

What is an infill well oil and gas?

Infill wells are additional wells targeting pockets of oil left behind from the original development plan. This is done extensively on the Norwegian continental shelf and contributes to accelerated and improved recovery.

What is well infill?

Infill Well means an additional well drilled within an approved or existing Spacing Unit.