Zirconium dispersoid gel complex oil displacing system and preparing method thereof

Abstract

The invention belongs to the field of oilfield chemistry, and particularly relates to a zirconium dispersoid gel complex oil displacing system. The zirconium dispersoid gel complex oil displacing system includes a multi-scale zirconium dispersoid gel, a polyether type nonionic surfactant and preparation water, wherein the mass fraction of the multi-scale zirconium dispersoid gel is 0.16%-0.24% of the total mass of the complex oil displacing system; the polyether type nonionic surfactant is 0.1%-0.4% of the total mass of the complex oil displacing system; the balance is water, and the total mass fraction of all components is 100%. According to the invention, the multi-scale zirconium dispersoid gel and the polyether type nonionic surfactant have excellent synergistic effect, and the oil-water interfacial tension can be reduced to the order of magnitudes of 10<-3> mN / m, so that the displacement efficiency of an oil-displacing agent is remarkably improved, adverse effect caused by weakened viscosity of polymers in a binary combination flooding or a ternary combination flooding is avoided, and adverse effect caused by alkali is avoided, and the oil displacing effect of the complex oil displacing system is improved.

Description

technical field [0001] The invention belongs to the field of oil field chemistry, and in particular relates to a composite oil flooding system of a multiscale zirconium jelly dispersion and a polyether type nonionic surfactant, as well as a preparation method and an oil flooding method. Background technique [0002] Waterflood development is the main way of oilfield exploitation in my country, but the long-term waterflood development of oilfields leads to the intensification of stratum heterogeneity, which accelerates the rise of water cut in the middle and later stages of oilfield development, and the water flooding is inefficient or ineffective circulation, resulting in a large amount of residual oil in the formation. Oil cannot be used. Therefore, how to improve the deep tapping of remaining oil is the key to increasing and stabilizing production of oilfields developed by water flooding in the middle and late stages. Improving the swept volume and oil washing efficiency o...

AI Technical Summary

Problems solved by technology

CN102504794A discloses a binary compound flooding system of a hydrophobic association polymer-mixed surfactant for tertiary oil recovery, the binary compound flooding system is composed of a hydrophobic association polymer, petroleum sulfonate, n-pentanol and dodecyl Composed of betaine and the rest of water, the composite flooding system can reduce the oil-water interfacial tension by 10 -3 mN / m, improving the recovery by more than 20%, but the composition of the mixed surfactant is relatively complex, and the polymer mobility control ability in the composite flooding is weak, especially in the subsequent water flooding stage, the injection pressure drops rapidly, and the oil displacement agent It is easy to cause the finger to creep into the oil well, which greatly limits the oil displacement effect of the oil displacement agent, reduces the use value of the oil displacement agent, and is difficult to obtain long-term effective development effect

However, this method does not consider improving the oil washing efficiency of the oil displacement agent, but only achieves enhanced oil recovery from the aspect of expanding the swept volume of the subsequent fluid

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