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Zirconium dispersoid gel complex oil displacing system and preparing method thereof

一种复合驱油、驱油方法的技术,应用在化学仪器和方法、开采流体、土方钻采等方向,能够解决未考虑提高驱油剂洗油效率、混合表面活性剂成份复杂、聚合物流度控制能力弱等问题,达到避免不利影响、良好老化稳定性、提高驱油效果的效果

Active Publication Date: 2014-02-19
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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  • Zirconium dispersoid gel complex oil displacing system and preparing method thereof
  • Zirconium dispersoid gel complex oil displacing system and preparing method thereof
  • Zirconium dispersoid gel complex oil displacing system and preparing method thereof

Examples

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preparation example Construction

[0039] The preparation method of the above-mentioned zirconium jelly dispersion composite oil displacement system comprises the following steps:

[0040] At room temperature (20±5°C), add one of the nanoscale, micronscale or millimeter-scale zirconium jelly dispersions to the liquid preparation water, stir for 5 minutes until it is uniformly dispersed; then add polyether-type nonionic surfactant Stir for 5 minutes until it is fully dissolved. In the zirconium jelly dispersion composite oil displacement system, the mass fraction of the zirconium jelly dispersion is 0.16% to 0.24%, and the mass fraction of the surfactant is 0.1% to 0.4%. , so as to obtain the composite flooding system of zirconium jelly dispersion.

[0041]An oil displacement method, when the water content of the oil well corresponding to the water injection well increases significantly, the water flooding is inefficient or ineffective and the development effect becomes poor, and a large amount of remaining oil ...

Embodiment 1

[0051] This example provides the preparation method and oil displacement method of the nano-scale zirconium jelly dispersion composite oil displacement system.

[0052] Nanoscale zirconium jelly dispersion composite oil displacement system, including: nanoscale zirconium jelly dispersion, mass fraction is 0.24%; polyether type nonionic surfactant, mass fraction is 0.1%; The fraction is 99.66%, and the sum of the mass fractions of each component is 100%.

[0053] At room temperature (20±5°C), add 0.24g of nano-sized zirconium jelly dispersion (particle size: 108nm) and 0.1g of polyether-type nonionic surfactant in sequence while stirring in 99.66g of clear water, and stir evenly for 5 The complex oil displacement system of zirconium jelly dispersion was formulated in minutes, and the composite oil displacement system reduced the interfacial tension of oil and water by 2.4135×10 -3 mN / m.

[0054] This example provides the oil displacement method of the nano-scale zirconium jel...

Embodiment 2

[0060] This example provides the preparation method and oil displacement method of the composite oil displacement system of micron-sized zirconium jelly dispersion.

[0061] Micron-sized zirconium jelly dispersion composite oil displacement system, including: micron-sized zirconium jelly dispersion, the mass fraction is 0.2%; polyether type nonionic surfactant, the mass fraction is 0.3%; The fraction is 99.5%, and the sum of the mass fractions of each component is 100%.

[0062] At room temperature (20±5°C), add 0.2g of micron-sized zirconium jelly dispersion (particle size: 5.6μm) and 0.3g of polyether-type nonionic surfactant in 99.5g of clear water while stirring, and stir evenly The composite oil displacement system of micron-sized zirconium jelly dispersion was prepared in 5 minutes, and the composite oil displacement system reduced the oil-water interfacial tension by 1.6352×10 -3 mN / m.

[0063] This example provides the oil displacement method of the micron-sized zirc...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584E21B43/22
CPCC09K8/584C09K8/032C09K2208/10E21B43/20E21B43/162
Inventor 戴彩丽赵光由庆赵明伟
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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