The Connection Of Petroleum Sulfonate’s Composition And It’s Performance

Petroleum sulfonate weak base ASP flooding have succeed in Daqing North SecondWest II reservoir field test, in the testing process, the lowest rate of moisture in the producedfluids dropped to79.0%, the ratio of oil recovery is of25%higher than flooding enhancedwater. The oil displacement efficiency is directly affected by petroleum sulfonate surfactants,emulsifying properties and adsorption performance, petroleum sulfonate performance and itscomposition are closely related. Research on the relationship between the composition andproperties of petroleum sulfonate can not only guides the selection of raw materials ofpetroleum sulfonate, also contributes to understanding the flooding characteristics of eachcomponent of petroleum sulfonate, it has important signification for the optimization ofpetroleum sulfonate synthesis process and for improving its oil displacement efficiency.In this paper, using N-methyl pyrrolidone to progressively extract reduced second-tierdewaxed oil. the extraction oil family composition and structure of group composition wereanalyzed, levels of extraction oil were sulfonated, separation and purification and compositionanalysis of petroleum sulfonate were also involved. Analyze the law between petroleumsulfonate composition and interfacial tension, emulsifying properties, adsorptionproperties,chromatographic separation characteristics.According to family composition analysis results, levels of extraction oil only containingsaturated hydrocarbons, aromatic and resin, in addition to asphaltene; with the increasing ofextraction progression, content of saturated hydrocarbons of levels of extraction oil graduallyincreased, aromatic hydrocarbons and gum content decreases; according to the result ofcomposition analysis of structure family, the average number of molecular, density andrefractive index are decreased gradually with the increase of the extraction stages; thepercentage of the carbon atoms in the total ring, the percentage of carbon atom in the aromaticring, the average total number of rings per average molecule and the average number ofaromatic rings per molecule on average are gradually reduced with the increase of theextraction stages, the percentage of alkane carbon atoms increases with the increase of theextraction stages.Interfacial tension of petroleum sulfonate weak base ternary system decreased with theincrease of crude oil extraction stages. Petroleum sulfonate in less extracted stages, its highalkali concentration interfacial tension of ternary system is lower; petroleum sulfonate inhigher extracted stages, its interfacial tension of petroleum sulfonate weak base ternarysystem tend to decrease. When the ratio of oil and water is1:1, with the increase of extraction stages, in theemulsion system of the petroleum sulfonate ASP injected fluid and dehydration crude oil, theratio of water precipitation is gradually decreased, the particle size of the emulsion particles isalso gradually decreased. With the decrease of the percentage of carbon atom in the total ring,the percentage of aromatic ring carbon atom, average number of total rings permolecule,average number of aromatic ring per molecule,petroleum sulfonate emulsifyingproperties gradually are increased. Emulsion stability of the ternary dilution system overall isbetter than ASP injection system.The adsorption amount of petroleum sulfonate in the ternary system on kaolin and oilsands gradually is decreased, with the decrease of the percentage of carbon atoms in total ring,percentage of carbon atoms in aromatic ring, the number of average total ring per averagemolecule, the number of average total aromatic ring per average molecule. The maximumadsorption capacity of the1st to the8th of petroleum sulfonate on kaolin and oil sands nearthe critical micelle concentration. Adsorption amount of petroleum sulfonate on kaolin ishigher than on oil sands. In the petroleum sulfonate ternary system chemical separation ispresent in each chemical agent in II oil reservoir, HPAM first breakthroughs, followed byalkali breakthrough and surfactant final breakthroughs. With the increase of seepage distance,the time of each chemical agent breakthrough becomes longer, the extent of chromatograpHicseparation becomes larger. The extent of chromatograpHic separation in II oil reservoir islarger than in I oil reservoir.