| As an important non renewable resource,oil played an important role in energy strategy.At present,after the primary and secondary extraction,60%-80% of the remaining crude oil was still in the oil and gas well,this part of the oil mainly existed in the hollow of the underground reservoir,the extraction efficiency was low,and the development of efficient tertiary oil recovery technology had become one of the most urgent problems to be solved at present.Among them,the design and preparation of displacement agent with excellent performance could effectively improve the recovery of tertiary oil recovery.The results showed that nano particle displacement agent could be modified on the surface by different types of surfactants to obtain multifunctional nano materials.However,the nanoparticle oil recovery technology was still not mature enough,and the problems such as poor temperature and salt resistance were difficult to be solved.Nano graphene oxide had a unique sheet structure and high reactivity of the interface properties.Janus modified graphene oxide was also more economically effective than other nanomaterials.Based on this,this paper used a variety of hydrophilic and hydrophobic groups to modify graphene oxide to obtain temperature-resistant and salt-resistant amphiphilic nanomaterials,and further compounds by stabilizers,a series of nanoparticle systems with good dispersion were screened,and their properties and applications were studied.Provide new ideas for the follow-up development of nano oil recovery technology.The main results were listed as following:(1)A series of homopolymers were synthesized using 2-(Dimethylamino)ethyl methacrylate and bromoalkane as monomers.Using the homopolymer as a stabilizer,an amphiphilic Janus nanographene oxide/stabilizer compound was prepared.The properties of polymer-stabilized nanomaterials and oil recovery performance of the composite system were systematically investigated.The results showed that the stability of the amphiphilic Janus graphene oxide added with stabilizer had been greatly improved,and the 50 mg/L stabilizer settled slowly within 24 h;the core flooding test proved that the oil recovery was very good.(2)Starting from the amphiphilic nano-flooding material in tertiary oil recovery,a synthetic method combining interfacial reaction and cerium-initiated radical polymerization was developed.In the kerosene/water emulsion,using graphene oxide as raw material,N-vinylpyrrolidone was grafted on one side of graphene oxide as a hydrophilic group,and the other side was grafted with N-octylamine as a hydrophobic group.The reaction conditions on the temperature and salt resistance of amphiphilic Janus graphene oxide were systematically investigated.The results showed that when the reaction temperature was 35 ?,cerium ammonium nitrate was0.02 g/m L,N-vinylpyrrolidone was 0.01 g/m L,the feeding interval was 0 min,and cerium ammonium nitrate was added first and then N-vinylpyrrolidone was added.Janus graphene oxide had the best temperature resistance and salt resistance.And in the core flooding test,there was a considerable oil recovery.The recovery rate of nanoflooding reached 7.6 %.The total recovery rate reached 42.5 %.(3)Starting from the amphiphilic nano-flooding material in tertiary oil recovery,a synthetic method combining interfacial reaction and cerium-initiated radical polymerization was developed.In kerosene/water emulsion,using graphene oxide as raw material,2-Acrylamido-2-methylpropane sulfonic acid was grafted on one side of graphene oxide as a hydrophilic group,and the other side was grafted with N-octylamine as a hydrophobic group.The reaction conditions on the temperature and salt resistance of amphiphilic Janus graphene oxide were systematically investigated.The results showed that when the reaction temperature was 40 ?,the feeding ratio of 2-Acrylamido-2-methylpropane sulfonic acid and cerium ammonium nitrate was 2:5,the feeding interval was 0 min,and the initiator was added first and then the monomer,the synthesized amphiphilic Janus graphene oxide had the best temperature resistance and salt resistance.The GO-PAMPS prepared by optimizing the synthesis conditions had good oil recovery in the core flooding test.The recovery rate of nanoflooding reached 8.7 %.The total recovery rate reached 34.4 %... |
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