Supercritical Co <sub> 2 </ Sub> Synthesis And Solution Properties Of Fluorinated Hydrophobic Copolymer

This Paper aims at the property of reservoirs with high salt, high temperature, and the actual requirements of oil displacement, basing the theoretical and molecular design concept of high polymer. Water-soluble double fluorocarbon hydrophobic copolymer has been synthesized by supercritical CO2 fluid which is composed of 12 fluorin substituted heptanol methacrylic acid ester (G04) as hydrophobic monomer and acrylamide (AM) as main monomer. And the ternary copolymer was prepared by incorporating the third temperature endurance and salts resistance monomer 2-acrylamido-2-methylpropanesulphonate (AMPS) to the molecule structure of double copolymer. The quaternary copolymer was prepared by incorporating the fourth anti-hydrolyze monomer styrene (ST) to the molecule structure of ternary copolymer.Of supercritical CO2 fluid as reaction medium for the three kinds of fluorine-containing copolymers hydrophobic free radical polymerization were studied. The effects of all the reaction conditions on monomer conversion, intrinsic viscosity were studied and the suitable reaction parameters were obtained. Under the same conditions do pilot experiments. The kinetics of the copolymerization was studied. The competition rate of AM and G04 was calculated.The structure of the copolymer products were illustrated by infrared (IR) spectroscopy and 1H-NMR analysis. The thermal stability of the product was also analyzed by employing thermal gravimetric analysis (TGA). The group of the copolymers obtained from elemental analysis. Scanning electron microscope (SEM) showed the copolymers micro particle structure.The indoor research of these copolymers under the condition of high salinity, high porosity and permeability reservoir in actual oil field indicated that the dissolving capacity of fluorine-containing copolymers can satisfy the requirement on offshore, and the copolymers have ideal performance such as increasing viscosity, resisting shear, stabling for long-term and controlling mobility well and reducing permeability of reservoir under reservoir condition.The Resistance Factor and Residual Resistance Factor are higher than HPAM, the remain static and dynamic adsorption are reasonable. All the researches show that the three kinds of fluorine-containing copolymer have good application prospect in enhancing oil recovery at lower concentrations.Research results show that these new copolymers are feasible and economic benefits for raising crude oil recovery in reservoirs with high salinity, high temperature, high porosity and permeability reservoir. The quaternary copolymer was the best Oil displacement.