A series of new anionic-nonionic surfactants, biophenol polyoxyethylene ether carboxylate (BPPC), were synthesized using biophenol as raw material. The chemical structure of anionic-nonionic surfactant was determined by Fourier transform infrared spectroscopy and elemental analysis. The effects of concentration and degree of polymerization on surface tension were investigated. These new surfactants have good surface activity. The critical micelle concentration (cmc) is 9.30 × 10−3 mol/L, 8.50 × 10−3 mol/L, 8.10 × 10−3 mol/L, and 7.71 × 10−3 mol/L. The corresponding surface tensions at CMC are 28.38. mN/m, 28.60 mN/m, 30.40 mN/m, and 30.00 mN/m. Then focus on the foaming properties of BPPC. The results showed that the concentration of surfactant and Ca2+/Mg2+ had certain effects on the foaming properties and foam stability of cashew nut-based surfactants. Due to the relatively good foam properties of BPPC, it has broad application prospects in detergents and petroleum recovery.
Aiming at the problem of shortage of clean water resources and mixing fracturing fluid in winter in Erlian oilfield, the technology of producing water to prepare fracturing fluid was studied. Horizontal comparison of water samples from four combined oil and gas treatment stations shows that oil, surfactant and bacteria are the main factors that affect the indigestion of hydroxypropyl guar gum in oilfield produced water. Through the indoor research developed a new type of multi-functional cosolvent and explored the oilfield produced water confecting fracturing fluid formulation system: 0.3-0.5% hydroxypropyl guar gum +X% multifunctional cosolvent + 0.2% flow-back agent + 0.4-0.6% crosslinking agent. This technology simplifies the mixing process and reduces the amount of additives. The liquid still has a high viscosity after being placed for more than 3 to 4 days in summer. In winter, using the produced water for mixing can reduce the influence of environmental temperature and ensure the smooth construction. After field application in well h5-19, the effect is outstanding, which provides important technical support for follow-up fracturing construction in Erlian oilfield.
Four kinds of biological phenolamine resin block ethers (BPPC) surfactants with different molecular weights were synthesized from biological phenol, formaldehyde and polyvinyl polyamines. The structure of BPPC was characterized by Ft-ir and H NMR. The surface properties of BPPC polyether surfactant and the change curve of surface tension with concentration in aqueous solution at different temperature were studied by surface tension method. The results showed that the critical micelle concentration (cmc) of BPPC and the γcmc increased with the increase of EO content. With the increase of molecular weight, number of branched chains and length of branched chains, cmc and γcmc decreased. The thermodynamic calculation results show that BPPC shows enthalpy/entropy compensation during micellization in aqueous solution. The compensation temperature T was all (300±2) K, and with the increase of molecular weight, number of branched chains and length of branched chains, the stability of BPPC formed in aqueous solution was enhanced.
In order to screen out the optimal microemulsion oil drive system, the effect of micro emulsion performance on the residual oil of pore is selected, and the remarkable effect of improving recovery rate is proved from both macro and micro aspects by analyzing the fissure core oil drive experiment and the distribution law of the residual oil of the pore. The results showed that the best microemulsion system is made of positive octane 8mL, water 8mL, 4.5% mass fraction of the beetroot, 6% mass score of positive butanol, 5% quality score of NaCI. And that microemulsion system has a smaller particle size distribution range, higher viscosity, strong stability and a smaller proportion of pore residual oil.
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