What is an oil-wet reservoir?
Reservoirs are characterized by their wettability When the rock is water-wet, water is preferentially in contact with the mineral when oil is the surrounding phase. The rock is said to be oil-wet when oil is the liquid in contact. The state in between is called intermediate- or mixed-wet.
What is reservoir wettability?
Wettability in a reservoir is a measurement of the ability of a fluid to coat the rock surface. Wettability and heterogeneity have a significant impact on the shape of the relative permeability curves.
What is a waterflood in oil field?
1. n. [Well Completions, Enhanced Oil Recovery] A method of secondary recovery in which water is injected into the reservoir formation to displace residual oil. The water from injection wells physically sweeps the displaced oil to adjacent production wells.
Why is wetting important?
Wetting is important in the bonding or adherence of two materials. Wetting and the surface forces that control wetting are also responsible for other related effects, including capillary effects. There are two types of wetting: non-reactive wetting and reactive wetting.
What is a wetting phase?
[′wed·iŋ ‚fāz] (petroleum engineering) In a two-phase oil reservoir system (oil and water), one phase (water) will wet the pore surfaces of the reservoir formation, the other (oil) will not.
Is waterflooding a secondary recovery?
A method of secondary recovery in which water is injected into the reservoir formation to displace residual oil. The water from injection wells physically sweeps the displaced oil to adjacent production wells.
What does wettability mean?
Wettability is the ability of a liquid to maintain contact with a solid surface, and it is controlled by the balance between the intermolecular interactions of adhesive type (liquid to surface) and cohesive type (liquid to liquid).
What is wetting phase in petroleum engineering?
How does a waterflood work?
Water injection or water flooding is a secondary hydrocarbon recovery technique where produced water, treated or demineralized water, or freshwater is injected into a well’s formation under high pressure and temperature conditions to recover more of the oil initially in place (OIIP).
What is wettability in oil and gas?
Wettability describes a preference of a solid surface to be in contact with one fluid rather than another. In reservoir rock, the solid surface is composed of mineral grains, and the fluids in the pore space are typically an immiscible combination of water, oil and gas.