Abstract
A quaternary polymer (HGP) was prepared by the free-radical polymerization of acrylamide, acrylic acid, maleic anhydride functionalized β-cyclodextrin (MAH-β-CD), and N-(3-methacrylamidopropyl)-N, N-dimethylnaphthalen-1-aminium chloride (NAP). It was found that host–guest behavior occurred most effectively at a molar rate of NAP and CD with 1:1, which exhibited better solubility than hydrophobically associative polymer. Moreover, the as-prepared polymer has superior salt tolerance, shear resistance, and viscoelasticity due to host–guest strategy. More importantly, the HGP solution simulates the distribution of formation water in the Bohai SZ1-1 oilfield has good rheological properties at 120 °C. All results show that the proposed polymer could be a competitive candidate in oilfield applications such as fracturing fluids, displacement fluids, and drilling fluids.
Highlights
Water-soluble polymers have become increasingly important in oilfield applications such as hydraulic fracturing, enhanced oil recovery, and drilling [1]
Proton signals of 3.0 ppm were assigned to –N+–CH3, and 5.56 to 6.24 ppm were associated with the proton peak of naphthalene
The 3.272 ppm proton signal was Polymers 2021,d13e, rxiFvOeRdPEfErRoRmEVtIhEWe C-CH-O of the glucose proton unit, which corresponds to Figure 26ao,fb1;7the experimental results verified the identity of the synthesized polymer to the target
Summary
Water-soluble polymers have become increasingly important in oilfield applications such as hydraulic fracturing, enhanced oil recovery, and drilling [1]. Compared with conventional water-soluble polymers, HAWSPs have poor solubility due to the presentence of hydrophobic groups, which one of the factors restricting its application in oil fields. There is a network structure in such a polymer solution caused by the inclusion of the β-CD and the guest such as phenyls, long-chain alkyls, adamantyl, and azobenzene [17,18,19,20,21]. Weickenmeier et al obtained a polymer solution with an apparent supramolecular network structure attributed to the host–guest effect between β-CD polymers and hydrophobically modified polymers [22].
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