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Vesicle oil-displacing agent formed by anionic surfactant compounded system and application thereof

A technology of surfactant and vesicle oil displacement agent, applied in the field of oilfield chemistry, can solve the problems of lack of technology, inability to form micelles or microemulsions, etc., and achieve improved salt resistance, strong interfacial adsorption tendency, and good reservoir adaptation. sexual effect

Active Publication Date: 2015-08-05
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the development potential of high-salt oil reservoirs is great, but due to the challenge brought by high salinity to the salt resistance of surfactants, most surfactant systems cannot be formed under high-salt conditions, which can reduce the interfacial tension of oil and water. Ultra-low micelles or microemulsions, which can be applied to high-salt reservoirs to enhance oil recovery systems and related technologies are seriously lacking

Method used

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  • Vesicle oil-displacing agent formed by anionic surfactant compounded system and application thereof
  • Vesicle oil-displacing agent formed by anionic surfactant compounded system and application thereof
  • Vesicle oil-displacing agent formed by anionic surfactant compounded system and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A vesicular oil displacing agent formed by an anionic surfactant compound system, after mixing surfactant B, surfactant C and mineralized water with a total salinity of 500ppm, at a temperature of 25°C, in the presence of additives The vesicle oil displacement agent was prepared by stirring for 0.3 h under triggering, and the mineralized water ions were composed of calcium ions and magnesium ions.

[0034] In the obtained vesicle oil displacement agent, the total mass concentration of surfactant B and surfactant C is 0.5wt%, the mass ratio of surfactant B:surfactant C is 1:3, and the addition amount of auxiliary agent is the same as The total mass ratio of surfactant B and surfactant C is: 1:3,

[0035] Described surfactant B is branched chain sodium lauryl sulfate,

[0036] Described surfactant C is sodium dodecylbenzenesulfonate,

[0037] The auxiliary agents are citric acid and oleic acid, and the mass ratio of citric acid to oleic acid is 1:2. The prepared anioni...

Embodiment 2

[0049] A vesicular oil displacing agent formed by an anionic surfactant compound system, after mixing surfactant B, surfactant C and mineralized water with a total salinity of 1000ppm, at a temperature of 30°C, in the presence of additives The vesicle oil displacement agent was prepared by stirring for 0.5 h under triggering, and the mineralized water ions were composed of calcium ions and magnesium ions.

[0050] In the prepared vesicle oil displacement agent, the total mass concentration of surfactant B and surfactant C is 0.6wt%, the mass ratio of surfactant B:surfactant C is 4:1, and the addition amount of auxiliary agent is the same as The total mass ratio of surfactant B and surfactant C is: 1:5,

[0051] Described surfactant B is branched chain lauryl polyoxyethylene ether,

[0052] Described surfactant C is sodium lauryl sulfate,

[0053] The auxiliary agents are citric acid and oleic acid, and the mass ratio of citric acid to oleic acid is 1:2. The prepared anionic...

Embodiment 3

[0061] A vesicular oil displacing agent formed by an anionic surfactant compound system, after mixing surfactant B, surfactant C and mineralized water with a total salinity of 2500ppm, at a temperature of 30°C, in the presence of additives The vesicle oil displacement agent was prepared by stirring for 0.4 h under triggering, and the mineralized water ions were composed of calcium ions and magnesium ions.

[0062] In the obtained vesicle oil displacement agent, the total mass concentration of surfactant B and surfactant C is 0.4wt%, the mass ratio of surfactant B:surfactant C is 1:1, and the addition amount of auxiliary agent is the same as The total mass ratio of surfactant B and surfactant C is: 1:4,

[0063] Described surfactant B is branched chain sodium lauryl carboxylate,

[0064] Described surfactant C is sodium α-olefin sulfonate,

[0065] The auxiliary agents are citric acid and oleic acid, and the mass ratio of citric acid to oleic acid is 1:2.

[0066] The produc...

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Abstract

The invention relates to a vesicle oil-displacing agent formed by an anionic surfactant compounded system. The vesicle oil-displacing agent is prepared by mixing a surfactant B, a surfactant C and mineralized water and stirring a mixture under the trigger of an auxiliary agent. Mass concentration of the surfactant B and the surfactant C is 0.3-0.8 wt%. The ratio of the addition amount of the auxiliary agent to the total mass of the surfactants B and C is 1:3-5. Total salinity of the mineralized water is 500-5000 ppm. The vesicle oil-displacing agent of the anionic surfactant compounded system has strong oil-water interface adsorption tendency. By in-situ assembling, a predetermined interface layer is formed. Thus, interfacial tension can be rapidly reduced to an ultralow level by oil-water. Without any alkali, 10<-3>mN.m<-1> of ultralow interfacial tension can be formed with crude oil. The effect of reducing the oil-water interfacial tension is prominent, and the action time is short. The interfacial tension can be reduced to 10<-3>mN.m<-1> within 10-15 min. The vesicle oil-displacing agent is suitable for tertiary oil recovery for enhancing crude oil recovery.

Description

technical field [0001] The invention relates to a vesicle oil displacement agent formed by an anionic surfactant compound system, which can quickly reduce the oil-water interfacial tension to an ultra-low (10 -3 mN·m -1 ), which is applied to enhance oil recovery in tertiary oil recovery, and belongs to the field of oilfield chemistry technology. Background technique [0002] Petroleum is a very important non-renewable resource. With the rapid economic growth, the society's demand for oil has risen sharply, and the possibility of rediscovering large reserves of oil reservoirs has decreased, making the improvement of the recovery rate of developed oil fields attract much attention. It is imminent to adopt technical means to improve the recovery factor of developed oilfields. [0003] During oil production, the fluid flow in the reservoir is affected by geological factors such as reservoir sandstone pore structure and system wettability, as well as factors such as crude oil / ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 李英路建
Owner SHANDONG UNIV
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