Scientists discover two surprising patterns in flowing clay

What in the News?

Researchers from the Raman Research Institute have developed a novel method to control the mechanical behaviour of displaced clay, improving understanding of oil recovery processes and clay transport in subsurface environments. 

Background

• In oil extraction, engineers inject fluids like glycerol (a viscous alcohol) into rocks to displace trapped oil.
• Viscosity refers to a fluid’s resistance to flow (e.g., honey > oil > water).
• When a less viscous fluid (like water) pushes a more complex fluid (like clay suspension), distinct patterns form.
• Clay suspensions are non-Newtonian fluids, meaning:
  • They behave differently under stress
  • They can hold shapes (like toothpaste or mayonnaise)
• In contrast, Newtonian fluids (like water) flow uniformly and have flat surfaces at rest.

Key Findings of the Study

• The study focuses on microstructures formed when water displaces clay in confined spaces.
• Researchers identified ways to control the mechanical behaviour of clay during displacement.
• Unlike earlier research that examined large-scale patterns, this study highlights:
  • Formation of fine-scale structures
  • Growth dynamics of these patterns.

Source: PIB