04-Wettability - Rock Wettability Instructional Objectives...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Rock Wettability 1 Rock Wettability Instructional Objectives: - Define Wettability, interfacial tension, and adhesion tension. - Define and give examples of drainage and imbibition processes. - Explain the difference between water-wet and oil-wet rocks. - Explain the effects of wettability on waterflood performance. - List the common laboratory methods to measure wettability. Definitions: Wettability : Tendency of one fluid to spread on or adhere to a solid surface in the presence of other immiscible fluids. Wettability refers to interaction between fluid and solid phases. Interfacial tension is the force per unit length required to create a new surface. Interfacial tension is commonly expressed in Newtons/meter or dynes/cm (Newtons/meter = 1,000 dynes/cm). Adhesion tension can be expressed as the difference between two solid-fluid interfacial tensions. θ σ cos ow ws os T A = = A negative adhesion tension indicates that the denser phase preferentially wets the solid surface. An adhesion tension of zero indicates that both phases have an equal affinity for the surface. Contact Angle: Solid Water Oil Oil Oil os ws ow θ The contact angle, , is measured through the denser liquid phase. Contact angle ranges from 0o to 180 o . Contact angle defines which fluid wets the solid surface. In hydrocarbon reservoirs: Solid surface is reservoir rock (i.e., sandstone, limestone, dolomite or mixtures of each). Fluids are oil, water, and/or gas. Wetting Phase Fluid: - Wetting phase preferentially wets the solid rock surface.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Rock Wettability 2 - Because of attractive forces between rock and fluid, the wetting phase is drawn into smaller pore spaces of porous media.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 06/12/2010 for the course PETROLEUM 1500 taught by Professor Ahmedalbamby during the Spring '10 term at University of Texas.

Page1 / 5

04-Wettability - Rock Wettability Instructional Objectives...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online