Synthesis and Performance Evaluation of High Temperature and Salt Water Resistant Filter Loss Additives
In response to the problem of insufficient high-temperature and salt resistance of existing water-based drilling fluid loss reducers,a high-temperature and salt resistant loss reducer was prepared by free radical polymerization of aqueous solution using sodium humate,N,N-dimethylacrylamide(NNDMA),diallyl dimethyl ammonium chloride(DMAAC),sodium styrene sulfonate(SSS)as monomers,and ammonium persulfate as initiator.The optimal reaction conditions were determined using orthogonal experiments:m(NaHm∶NNDMA∶DMDAAC∶SSS)=2∶6∶2∶2,monomer concentration of 30%,initiator dosage of 1.0%,and reaction temperature of 65℃.The structure of the product was characterized and analyzed using infrared spectroscopy,thermogravimetric analysis,nuclear magnetic resonance hydrogen spectroscopy,and environmental scanning electron microscopy,proving the successful preparation of the quaternary polymer.Through comparison with commonly used products on the market in terms of high temperature and salt resistance,it was found that the synthesized product has good high temperature and salt resistance.After aging at 230℃for 16 hours,the medium pressure filtration loss was 5 mL,the high temperature and high pressure filtration loss was 22 mL,the resistance to NaCl reached 25%,and the resistance to CaCl2 reached 1.5%,It has broad application prospects in high-temperature and high salinity drilling fluids.
water-based drilling fluidfilter loss reducerhigh temperature resistancesalt resistancepolymer
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