Preparation and Application of Environmentally-Friendly Copolymer Filtration Control Agent Based on Hydrogen Bonding

Abstract

Traditional water-based drilling fluids encounter challenges in terms of poor solubility in high-density water-based drilling fluids and difficulty in meeting biotoxicity standards when using heat-resistant polymers as filtration control agents. To address this issue, this study introduces MIL-100 (Fe)-NH2 type MOF due to its excellent catalytic activity, which activates industrial-grade large-sized lignosulfonate sodium. The particle size of lignosulfonate sodium is reduced from micrometer to nanometer scale, significantly enhancing its reactivity in polymerization reactions. The activated lignosulfonate sodium is then used as a raw material and reacted with acrylamide, 2-acrylamido-2-methylpropane sulfonic acid, and catechol to produce a novel polymer filtration control agent named PTASL. Biotoxicity tests demonstrate that both pre-aged and post-aged PTASL exhibit EC50 values exceeding 30,000 mg/L, indicating that they are environmentally friendly polymers with no biotoxic effects.