| Hydrophobically associating polymers exhibited excellent characteristic performance because of associative effect of the polymers formed physical association with a certain reversible intensity and the formation of a three-dimensional network structure.The polymers were widely used in the processes of acid fracturing,enhanced oil recovery and drilling.Meanwhile,rigid groups attached into the PAM chain can improve effectively the performance on resisting high temperature and maintain a high viscosity.Long chain imidazoline derivatives containing both hydrophobic groups and heterocyclic rigid structure.The corresponding polymers which attached with long chain imidazoline derivatives show good mechanical properties and heat resistance,et al.We designed and synthesized three kinds of imidazoline compounds.The six different imidazoline acrylamide-based polymers were prepared by above imidazoline derivatives as a functional monomer,and the basic properties of the polymers were measured,expecting them to have the prospect of enhanced oil recovery.Results are as following:(1)Three imidazoline derivatives 1-(2-N-acrylamido ethyl)-2-oleic imidazoline of acid(NIDA),1-(2-N-allyl aminoethyl)-2-oleic imidazoline(NIPA)and 1-(2-N-(3-carboxyl acryloyl)-aminoethyl)-2-oleic imidazoline(NIMA)were synthesized by oleic acid and diethylenetriamine as raw materials.A sulfonate monomer,named as 3-(diallyl-amino)-2-hydroxypropyl(NDS),was synthesized by epichlorohydrin,diallyl amine and sodium hydrogen sulfite.The morphologies of the four functional monomers were characterized by infrared spectroscopy(IR)and 1H nuclear magnetic resonance(1H NMR).(2)Imidazoline-based sulfonate polymers were prepared by acrylamide(AM),acrylic acid(AA)and above imidazoline derivatives with the sodium salts of 3-(diallyl-amino)-2-hydroxypropyl(NDS)or 2-acrylamido-2-methylpropane sulfonic acid(AMPS),denoted as AM/AA/NDS/NIDA,AM/AA/AMPS/NIDA,AM/AA/NDS/NIPA,AM/AA/AMPS/NIPA,AM/AA/NDS/NIMA and AM/AA/AMPS/NIMA.Furthermore,we investigated and determined the optimum reaction conditions of the polymers.(3)The associative behavior of imidazoline polymers were researched by pyrene fluorescence probe.The critical aggregation concentration of the polymers solution appeared respectively at 1000 mg/L,1250 mg/L,800 mg/L,1250 mg/L,1000 mg/L and 800 mg/L.(4)The imidazoline-based copolymers had excellent apparent viscosities at at a high-temperature and high-shear in comparison with the same concentration of HP AM.Wherein,the viscosity of polymer AM/AA/NDS/NIDA,AM/AA/NDS/NIPA and AM/AA/NDS/NIMA solution were 26.8 mPa s,27.7 mPa s and 25.4 mPa s with a shear rate of 1000 s-1,respectively.The viscosity of polymer AM/AA/AMPS/NIDA,AM/AA/AMPS/NIPA and AM/AA/AMPS/NIMA solution viscosity retention values were 29.1 mPa s,24.9 mPa s and 31.0 mPa s at a shear rate of 1000 s-1,respectively.(5)The apparent viscosity of HP AM solution was just 39.1 mPa·s at 110 ?.However,the retention viscosities of imidazoline-based polymer AM/AA/NDS/NIDA,AM/AA/AMPS/NIDA,AM/AA/NDS/NIPA,AM/AA/AMPS/NIPA,AM/AA/NDS/NIMA and AM/AA/AMPS/NIMA were 61.5 mPa s,66.0 mPa s,62.1 mPa s,47.3 mPa s,58.0 mPa·s,and 52.9 mPa·s at a temperature of 110 ?,respectively.(6)Polymer AM/AA/NDS/NIDA has a resistance to NaCl and MgCl2,and the viscosities of above polymer solution can keep to 49.6 mPa s and 37.1 mPa s when the concentration of NaCl or MgCl2 were 10000 mg/L and 2000 mg/L,respectively.Polymer AM/AA/NDS/NIMA has a good performance to resist CaCl2 that the viscosity of the solution was 30.7 mPa·s at the concentration of 2000 mg/L.According to the core flooding tests,the oil recovery could be enhanced up to 12.3%by imidazoline-based polymer AM/AA/NDS/NIMA brine solution,which possess the prospect of enhanced oil recovery. |
PDF Full Text Request