Nonlinearity in large amplitude oscillatory shear of drilling fluid: A comparative study on the oil and water base muds behavior


ETTEHADİ A., Ulker C., Altun G.

JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING, vol.208, 2022 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 208
  • Publication Date: 2022
  • Doi Number: 10.1016/j.petrol.2021.109536
  • Title of Journal : JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
  • Keywords: Drilling fluid, Nonlinear viscoelasticity, Large amplitude oscillatory shear (LAOS), Shear mechanism, Structural stability, VISCOELASTIC PROPERTIES, PRESSURE-DROP, LAOS BEHAVIOR, MODEL, RHEOLOGY, STRESS, TRANSITION, VISCOSITY, EQUATION

Abstract

A viscoelastic material exhibits both fluid (viscous) and solid (elastic) like properties simultaneously. The rheological behavior of drilling fluids is customarily measured under the assumption of pure viscous flow, yet they exhibit both viscous and elastic characteristics when subjected to deformation. Some imperative properties of drilling fluids such as gel strength, yield stress, and sag tendency at near-zero shear rate region are categorically under the influence of viscoelastic behavior and have not yet been completely understood due to the lack of appropriate measurement methods. Characterizing the complete rheological profile of material requires measuring linear and nonlinear viscoelastic responses at a wide range of stress/strain levels. The viscoelastic nonlinearity can be characterized under Large Amplitude Oscillatory Shear (LAOS) tests.