Inverse Microemulsion Polymerization Of Am / C <sub> 18 </ Sub> Dmaac / Styrene Water-soluble Hydrophobically Associating Polymer Research

Hydrophobically associating water-soluble polymers is water-soluble polymer with bit of hydrophobic group in hydrophilic macro chain. Hydrophobically associating water-soluble polymers has special rheology character, temperature resistance and salt tolerance,tackability and shear resistance, which makes it use in oil field. Application of hydrophobically associating polymer in oil field is one of the most important approach of the efficiency of drilling and rate of oil and gas recovery. This puts out a higher specification on molecular design of hydrophobically associating polymer. Whereas reservoir in EOR is high temperature and high degree of mineralization, polymer must take on good tractability and strong ability of resisting temperature and resisting salt, resisting shear to reach perfect effect as a kind of oil-displacing agent. When designing polymer with ability of resisting temperature and salt, introduce function monomer which maintain insensitivity to salt and which maintain bigger space steric hindrance. That makes polymer enhance chain stiffness and prevent chain from curling in high salinity to improve polymer's ability of resisting temperature and salt. This theses through molecular design , adopting antiphase micro emulsion polymerization ,polymerize AM/C18DMAAC/Styrene ,thereof evaluate its performance. Mol ratio of monomer is AM: C18DMAAC: Styrene = 8. 450: 0.470: 0.136, the temperature is 25, Initiator is oxygenation-reduction system, Reaction time is 12h.This theses finds that HWS has two critical concentrations. The first critical concentration(C1 *), is 500mg/l, the second critical concentration(C2 *,) is 2400mg/l; While the concentration is greater than C1 *, apparent viscosity increasing with salinity . Restoration ratio is 95% in 30days (11000rpm, shear 15s); Retention rate of degradation (near C1 *) is above 75%. It can indicate that favorable temperature resistance and salt tolerance in on-site sewage, its ability is better than extra high molecular polymer field application. At the last, we can conclude that synthetical polymer is accord of designed polymer through the medium of infra-red spectra and ultimate analysis on its structure. We have came to a purpose of molecular design.