Research On The Design, Synthesis And Application Of Gemini Oil-displacing Agent Based On Organosilicon-oxygen Skeleton

Petroleum is not only an important power fuel,but also a widely used chemical raw material.As a kind of resource,it plays an important role in the development of the world economy because of its low cost and high efficiency.According to the relevant data statistics and the medium-and long-term plans stipulated by the state,the oil demand will reach 604 million tons by 2O22,and the oil dependence on the outside will exceed 70%.Therefore,the energy security and the sustainable development of the economy are facing great challenges.According to the relevant data statistics,according to the medium-and long-term planning stipulated by the state,the oil demand will reach 604 million tons by 2022,and the oil dependence on the outside will exceed 70%.Therefore,the energy security and the sustainable development of the economy are facing great challenges.At present,as far as the reservoir type is concerned,it is either a low permeability reservoir,an ultra low permeability reservoir,or a "high temperature and high salt" reservoir.After primary and secondary oil recovery,most of the oilfields have entered the stage of "three high(high water cut,high recovery rate,high recovery rate)".The problem of improving oil recovery is extremely urgent.Among the many tertiary oil recovery technologies,chemical flooding is increasingly becoming the oil exploitation because of its"high cost-to-performance ratio".Therefore,the research of new oil displacement agent with high performance,friendly interface and moderate price has become the most important problem in the field of petroleum research.In view of the above situation,a kind of oil displacement agent based on organosilicon skeleton Gemini was designed and synthesized,and its physical and chemical properties were studied deeply.In this paper,octamethylcyclotetrasiloxane(D4),tetramethylcyclotetrasiloxane(D4H)and 3-(2,3-epoxypropyl)propyl methyl diethoxysilane(KH563)were used as raw materials.A series of hydrogen-containing epoxy polysiloxane skeletons with definite molecular weight and different chain lengths were synthesized by using hexamethyldisiloxane(MM)as a capping agent in the presence of concentrated sulfuric acid.Then a novel Gemini surfactant based on silicon oxide was synthesized by the reaction of maleic anhydride monoester and amino ethanesulfonic acid.The synthesized products were determined by chemical titration,infrared spectroscopy and nuclear magnetic resonance(NMR)of the national standard.ls correct.At the same time,the ring-opening polymerization,hydrosilylation and reaction conditions related to the synthesis of Gemini oil displacement agent are systematically studied,and the optimum synthesis route of the product is explored.optimum synthetic process of this series of polysiloxane framework is explored.Based on the synthetic products,the physical and chemical properties of three kinds of oil displacement agents are studied systematically.The results show that the minimum surface tension of the series oil displacement agents is 29.02 mN l/m,The corresponding critical micelle concentration(cmc)is 0.416 mmol l/L,and the surface tension corresponding to the critical micelle concentration decreases,which is much lower than that of conventional hydrocarbon surfactants,with the increase of siloxane chain from 0 to 8 in polysiloxane skeleton.At the same time,the test results show that the.series of binary oil displacement agents based on organosilicon framework have good temperature resistance,salt resistance and bivalent ion resistance(Ca2,+Mg2+).And the above properties meet the needs of the oil displacement application.