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Alkali-free oil displacement agent containing double long-chain s-triazine type ampholytic surfactant

A surfactant, s-triazine technology, applied in the field of alkali-free oil displacement agent, can solve problems such as oil displacement agent loss, achieve the effects of avoiding damage, being beneficial to sustainable development, and overcoming the decline of oil displacement efficiency

Inactive Publication Date: 2013-01-16
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And for the research of non-alkali flooding system, the cationic gemini surfactant proposed by Chen Hong et al. in CN1528853A has excellent ability to reduce crude oil / water interfacial tension without adding alkali in oil displacement agent, and overcomes existing The oil displacement rate of the oil displacement agent decreases due to the chromatographic separation phenomenon, but the cationic surfactant will absorb a large amount in the formation, resulting in the loss of the oil displacement agent

Method used

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  • Alkali-free oil displacement agent containing double long-chain s-triazine type ampholytic surfactant
  • Alkali-free oil displacement agent containing double long-chain s-triazine type ampholytic surfactant
  • Alkali-free oil displacement agent containing double long-chain s-triazine type ampholytic surfactant

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Effect test

preparation example Construction

[0034] ① Preparation of oil displacement agent components

[0035] The surfactant was prepared into a 1% (mass percentage) mother solution with water under the above-mentioned measurement conditions. The single oil-displacing agent component is directly taken out from the mother liquor and prepared into solutions with different contents; the test solution of the compound oil-displacing agent component is prepared from the respective mother liquors according to the total content of the surfactant and the compounding ratio. Take out the required corresponding amount and mix, and dilute to the required concentration;

[0036] ② Determination

[0037] Turn on the spinning drop interfacial tensiometer and the computer, and preheat the spinning drop interfacial tensiometer to the measurement temperature. The solution to be tested was kept at the measuring temperature. Draw out the solution to be tested with a syringe, and rinse the centrifuge tube 4 to 5 times. After filling the...

Embodiment 1

[0039] 1) Alkali-free oil flooding formulation of double long-chain s-triazine amphoteric surfactants, the components are as follows, all in mass percent:

[0040] Sodium N-methyl-N-(4-dodecylamino-6-octylamino-1,3,5-s-triazin-2-yl)-2-aminoethanesulfonate 0.05% ~ 1.00%

[0041] Prepare mineralized water balance

[0042]2), test conditions: determination conditions 1

[0043] 3) Interfacial tension results with crude oil.

[0044]

Embodiment 2

[0046] 1) Alkali-free oil flooding formulation of double long-chain s-triazine amphoteric surfactants, the components are as follows, all in mass percent:

[0047] Sodium N-methyl-N-(4-decylamino-6-octylamino-1,3,5-s-triazin-2-yl)-2-aminoethanesulfonate 0.0125% ~ 1.0000%

[0048] Prepare mineralized water balance

[0049] 2), test conditions: test conditions 1

[0050] 3) Interfacial tension results with crude oil.

[0051]

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Abstract

The invention belongs to the technical field of oil exploitation and relates to an alkali-free oil displacement agent containing a double long-chain s-triazine type ampholytic surfactant. The surfactant is N-methyl-N-(4,6-di-aliphatic amino-1,3,5-s-triazine-2-yl)-2-aminoethanesulfonic acid sodium salt; and the surfactant and aqueous solution are mixed evenly at the room temperature to fully dissolve the surfactant and obtain the oil displacement agent; and the surfactant can be used alone or be combined with the homologue. The oil displacement system can both reach the 10<-3>mN / m order of ultralow interfacial tension at 45 DEG C and 70 DEG C under the alkali-free condition and has the good capability of reducing the crude oi-formation water interfacial tension, thus the damage of the alkali in the alkali-containing system on formation can be avoided and the sustainable development of oil exploitation is easy to realize. The oil displacement system is suitable for different reservoirs and has higher adaptability; and the oil displacement agent has simple composition and can be used to overcome the reduction of the oil displacement efficiency to a certain extent, caused by the chromatographic separation effect.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and relates to a double-long-chain s-triazine amphoteric surfactant N-methyl-N-(4,6-difatty amino-1,3,5-s-triazine-2 -base)-2-sodium aminoethanesulfonate, an alkali-free oil displacement agent for recovering residual crude oil in formations after water flooding. Background technique [0002] Petroleum is an important energy and chemical raw material, as well as an important strategic material of a country, which has a decisive impact on the development of a country. During oil exploitation, after the crude oil in the formation is driven by water injection, only about 40% of the recoverable reserves can be extracted. The recovery of a large amount of residual crude oil requires enhanced oil recovery (that is, tertiary oil recovery), so as to further increase the crude oil production capacity. Chemical flooding is one of the main directions of enhanced oil recovery technology. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584
Inventor 乔卫红李静彭欢崔迎春
Owner DALIAN UNIV OF TECH
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