Organosiloxane-Modified Auricularia Polysaccharide (Si-AP): Improved High-Temperature Resistance and Lubrication...

Area of Science:

• Materials Science
• Chemical Engineering
• Petroleum Engineering

Background:

• Water-based drilling fluids (WBDFs) require additives for high-temperature performance.
• Existing additives often face limitations in thermal stability and functionality.

Purpose of the Study:

• To synthesize and characterize a novel organosilicon-modified polysaccharide (Si-AP).
• To evaluate the performance enhancement of Si-AP in WBDFs, particularly under high-temperature conditions.

Main Methods:

• Grafting synthesis of Si-AP.
• Characterization using FTIR and 1H-NMR.
• Thermal stability assessment via TGA.
• Performance evaluation in WBDFs, including rheology and fluid loss tests.

Main Results:

• Si-AP demonstrated good thermal stability up to 235 °C.
• Increased Si-AP concentration improved viscosity, reduced API filtration rate, and inhibited clay expansion.
• Si-AP enhanced lubrication by forming a film on clay particles, reducing friction.
• Si-AP exhibited superior high-temperature resistance and performance compared to unmodified polysaccharide.

Conclusions:

• Si-AP effectively optimizes lubrication, inhibition, and filtration control in WBDFs at high temperatures.
• The siloxane groups in Si-AP enhance thermal stability and resistance.
• Si-AP presents a promising, environmentally conscious additive for deep oil and gas exploration.