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Synthesis and Salt-Thickening Mechanism of Hydrophobic Association Copolymers Based on Functional Monomer Synergy
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DOI：10.1021/acs.iecr.5c04330.png)
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Abstract
En 中文
To improve the utilization rate of thickening agents used for oil recovery in high-temperature and high-salinity oil reservoirs, a water-soluble copolymer APDM was prepared via the copolymerization of acrylamide with functional monomer acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid (AMPS), octadecyldimethylallyl ammonium chloride (DMAAC-18), and N-vinylpyrrolidone (NVP) using the free-radical polymerization method. Then, hydrophobic copolymer HPAD and ACDM copolymer without DMAAC-18 and NVP were synthesized under the same conditions. The APDM copolymer was characterized by using infrared spectroscopy and proton nuclear magnetic resonance, and the salt resistance, viscoelastic properties, temperature resistance, and shear resistance of APDM, HPAD, and ACDM were determined. The results showed that APDM exhibits superior temperature resistance, shear strength, and thickening properties compared with those of HPAD and ACDM. APDM also demonstrates salt-thickening behavior in low-concentration saline solutions as the low salinity charge stimulates hydrophobic micelle microregions, facilitating solubilization of hydrophobic monomers and formation of supramolecular aggregates. The hydrophobic microporous network formed by DMAAC-18, the solubilization effect of NVP, and the charge-shielding effect of the sulfonic acid group in AMPS synergistically enhance the environmental adaptability of APDM. Rheological tests revealed apparent viscosities of 57.49 and 62.16 mPa·s for a 0.5 wt % APDM solution in deionized water and a 20,000 mg/L NaCl solution, respectively, after shearing for 1 h at 140 °C and 170 s–1. Furthermore, 0.5 wt % APDM in 2 × 104 mg/L CaCl2 and MgCl2 solutions exhibited apparent viscosities above 50 mPa·s at temperatures below 130 °C, showing excellent temperature and shear resistance. Therefore, the APDM copolymer is suitable for application as a thickener in high-salinity reservoirs.
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