SYNTHESIS AND PERFORMANCE EVALUATION OF A NEW TYPE OF AM/AMPS/MA/NVP QUATERNARY COPOLYMER FLUID LOSS ADDITIVE FOR DRILLING FLUID

With the continuous development of my country's exploration and development to deep formations, the temperature resistance of water-based drilling fluid is also lacing higher technical requirements. Among them, as an important part of water-based drilling fluids, the high temperature resistance of fluid loss additives is also very important. At the same time, the research and development of anti-high temperature fluid loss additives has always been a major issue in the field of oilfield chemistry in china. Aiming at the high temperature resistance of filtration reducer, this research used acrylamide (AM), 2-acrylamide-2-methylpropanesulfonic acid (AMPS), maleic acid (MA), and N-vinylpyrrolidone (NVP) is a polymer reaction monomer. The quaternary copolymer (AAMN-1) is obtained by the method of atom transfer radical polymerization. The structure of the product is characterized and analyzed by infrared spectroscopy, thermogravimetric analysis and other methods, and its resistance to high temperature filtration performance is comprehensively evaluated. The experimental results show that AAMN-1 has good thermal stability. When the added amount of polymer is 1%, the API filtration in the water-based slurry is only 8.8 mL after hot rolling at 200°C. The API filtration in the based slurry containing 30% NaCl is 26.8 mL. This research has shown that AAMN-1 has excellent high temperature resistance and filtration reduction performance.