Salt Polymer Synthesis And Its New Binary Composite Systems To Drive The Oil Nature Of The Study

Chemical Flooding plays an important role in the development process of Daqing oilfield and Shengli oilfield. And petroleum researchers are always interested in chemical Flooding. Especially in our country, chemical Flooding is the important part of enhancing oil recovery. Its basic application research is just unfolding.This paper aims at the property of reservoirs with high salt and high temperature, basing the synthetic theoretical and molecular design concept of high polymer. Use acrylamide as basic monomer, considering adopting the strong hydration anion group that does not form sediment with divalent ion to replace the carboxyl of HP AM on the one hand, on the other hand, design to adhibit large lateral group to raise the rigidity of macromolecule chain, so as to restrain the fierce drop in clew size because of inorganic electrolyte. In polymer molecular chain leading into anion type sulphonate group with strong hydration high active and large lateral group double bond compounds containing benzene ring. Through large mummers of experiments, a new kind of anti-salt multivariate polymer PBS has been synthesized. Infrared spectrum and nuclear magnetic resonance shows that the outcome is the goal PBS of this paper. Results of experiments show that PBS has better thermal stability. Its heat decomposes temperature is 312 ℃, higher than polyacrylamide (210 ℃); PBS solution viscosity retension rate is 50%, when salinity is at 10%, 30 percentage points higher than PHP AM solution.PBS and Gemini surfactant NNMB are matched to form binary compound system. The compatibleness, interphase with crude oil, reciprocity with rock, anti-salt and temperature tolerance of the binary compound system was studied. The results show that the system has good compatibleness and stability: (1)viscosity of the binary system is 20.45mPa.s at reservoir temperature 70 ℃; (2) interface tension reaches 10~-3 mN / m; (3) anti-sail 8.15g/L; (4)dynamic adsorptive capacity of NNMN is 14.1 mg / g and that of PBS is 260 μ g / g at least. At last, under reservoir temperature and salinity conditions, the efficiency and mechanism of enhancing oil recovery by the system were studied by means of physical simulation experiments. Show as a result: The binary system may raise water flooding recovery more than 26%. It has very good application prospect in enhancing oil recovery.Research results show that the new binary compound system is feasible for raising crudeoil recovery in reservoirs with high salt. The research accomplishment in this paper will produce better economic benefits when applied to flood oil in reservoirs with high salt. The system has great value of research and exploratory development.