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Related Concept Videos

Types of Fluids01:27

Types of Fluids

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Fluids can be classified into Newtonian and non-Newtonian fluids based on their response to shear stress. Newtonian fluids have a linear relationship between shear stress and the shear strain rate, following Newton's law of viscosity. Their viscosity remains constant regardless of the shear rate, making their behavior predictable and easier to analyze. Common examples include water, air, oil, and gasoline.
In contrast, non-Newtonian fluids do not follow Newton's law of viscosity, and...
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Regulating the Rheology of Drilling Fluids Under High-Temperature Conditions with Hydrophobically Associating

Xuyang Yao1,2, Kaihe Lv1, Jing He2

  • 1School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China.

Polymers
|April 14, 2026
PubMed
Summary

A new hydrophobic associative polymer, HATA, effectively enhances drilling fluid viscosity and controls filtration in high-temperature, high-salt environments. This advanced viscosifier maintains performance under extreme conditions, crucial for deep oil and gas exploration.

Keywords:
hydrophobic associationpolymertemperature and salt toleranceviscosity enhancerwater-based drilling fluid

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Area of Science:

  • Petroleum Engineering
  • Polymer Chemistry

Background:

  • Deep and ultra-deep oil/gas exploration faces challenges from high-temperature and high-salt drilling environments.
  • Existing drilling fluid viscosifiers struggle to maintain performance under these extreme conditions.

Purpose of the Study:

  • To synthesize and evaluate a novel hydrophobic associative polymer (HATA) as a drilling fluid viscosifier.
  • To investigate HATA's performance and mechanism in high-temperature, high-salt conditions using a bentonite base slurry.

Main Methods:

  • HATA synthesized via free-radical copolymerization of acrylamide (AM), AMPS, SSS, and SMA.
  • Characterization of HATA structure and evaluation of its performance in a 4 wt% bentonite slurry.
  • Testing under simulated high-temperature (180-200 °C) and high-salinity (36 wt% NaCl) conditions.

Main Results:

  • Modified slurry with 3 wt% HATA showed 69.20% viscosity retention after 16h at 180 °C.
  • API filtration loss was 7.2 mL, and HTHP filtration loss was 73.72% lower than the blank system.
  • Effective viscosity and yield point maintained at 200 °C and in 36 wt% NaCl brine.

Conclusions:

  • HATA demonstrates high-performance viscosity enhancement and filtration control in challenging drilling environments.
  • Mechanism involves regulating bentonite surface charges, forming 3D networks, and stabilizing clay hydration.
  • HATA offers significant theoretical and engineering value for high-temperature, high-salinity water-based drilling fluids.