Vesicle oil displacement agent formed from gemini surfactant, and applications of vesicle oil displacement agent in crude oil recovery rate increase

A technology of vesicle displacement agent and gemini surface, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of lack of technology, loss of interfacial activity, etc., and achieve low concentration, short onset time, good oil Effects of Tibetan Adaptation

Inactive Publication Date: 2015-08-12
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the development potential of high-salt reservoirs is great, but due to the challenge brought by high salinity to the salt resistance of surfactants, most surfactant systems lose their interfacial activity due to precipitation under high-salt conditions, and can be applied to high-salt reservoirs. There is a serious shortage of oil displacement agents and related technologies for enhanced oil recovery in salt reservoirs

Method used

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  • Vesicle oil displacement agent formed from gemini surfactant, and applications of vesicle oil displacement agent in crude oil recovery rate increase
  • Vesicle oil displacement agent formed from gemini surfactant, and applications of vesicle oil displacement agent in crude oil recovery rate increase
  • Vesicle oil displacement agent formed from gemini surfactant, and applications of vesicle oil displacement agent in crude oil recovery rate increase

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A vesicle oil-displacing agent formed by gemini surfactants is prepared by adding gemini surfactants into mineralized water with a total salinity of 20,000 ppm and stirring for 0.5 hours at 25°C to obtain a vesicle-forming oil-displacing agent; mineralized Water ions are composed of sodium ions, calcium ions, magnesium ions and chloride ions.

[0033] In the vesicle oil displacement agent, the mass concentration of gemini surfactant is 0.18wt%, and its scanning electron microscope picture is as follows figure 1 shown. The gemini surfactant is sodium didodecyl diphenyl ether disulfonate.

[0034] The product is tested for interfacial tension:

[0035] 1. Test instrument: TEXAS-500 spinning drop interfacial tensiometer

[0036] 2. Temperature: 50°C,

[0037] 3. Crude oil: experimental standard crude oil (provided by Shengli Oilfield)

[0038] 4. Water: distilled water

[0039] 5. Vesicle oil displacing agent: Example 1, main component (w%)

[0040] Put the sample t...

Embodiment 2

[0045] A vesicle oil-displacing agent formed by gemini surfactants is obtained by adding gemini surfactants into mineralized water with a total salinity of 23,000 ppm and stirring for 0.5 hours at 30°C to obtain a vesicle-forming oil-displacing agent; mineralization Water ions are composed of calcium ions, magnesium ions and chloride ions.

[0046] In the vesicle oil displacement agent, the mass concentration of gemini surfactant is 0.1wt%, and its scanning electron microscope picture is as follows figure 2 shown. The gemini surfactant is sodium didodecyl diphenyl ether dicarboxylate.

[0047] The product is carried out interfacial tension test, and the test instrument, crude oil, water, temperature used are the same as embodiment 1;

[0048] Vesicle oil displacing agent: embodiment 2, main component (w%)

[0049] Put the sample tube filled with the above-mentioned solution into it, and after it is stable for half an hour, add about 1 microliter of Xinjiang Karamay crude o...

Embodiment 3

[0054] A vesicle oil-displacing agent formed by gemini surfactants is obtained by adding gemini surfactants into mineralized water with a total salinity of 21,000 ppm and stirring for 0.5 hours at 30°C to obtain a vesicle-forming oil-displacing agent; mineralized Water ions are composed of calcium ions, magnesium ions and chloride ions.

[0055] In the vesicle oil displacement agent, the mass concentration of the gemini surfactant is 0.08wt%, and the gemini surfactant is dimer sodium carboxylate.

[0056] The product is carried out interfacial tension test, and the test instrument, crude oil, water, temperature used are the same as embodiment 1;

[0057] Vesicle oil displacing agent: embodiment 3, main component (w%)

[0058] The effects of different concentrations of vesicle oil displacement agents on interfacial tension are shown in Table 3:

[0059] table 3

[0060] Vesicle displacement agent concentration (w%)

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Abstract

The present invention relates to a vesicle oil displacement agent formed from a gemini surfactant, wherein a gemini surfactant and mineralized water are mixed to prepare the vesicle oil displacement agent, the mass concentration of the gemini surfactant is 0.02-0.2 wt%, the gemini surfactant molecule contains at least two negatively-charged polar hydrophilic groups and one or two hydrophobic groups, the single hydrophobic carbon chain length is 8-24, and the single hydrophobic carbon chain contains the benzene ring or naphthenic group. According to the present invention, the vesicle oil displacement agent formed from the gemini surfactant has the strong interface adsorption trend, the vesicle oil displacement agent and crude oil can form the ultra-low interface tension of 10<-3> mN.m<-1> without addition of any alkalis, the effect generation time is short, the interface tension can be reduced to 10<-3> mN.m<-1> within 10-15 min, and the vesicle oil displacement agent can be separately used or the vesicle oil displacement agent and a polymer can form a binary oil displacement system, and can be used in tertiary oil recovery so as to improve the crude oil recovery rate.

Description

technical field [0001] The invention relates to a vesicle oil displacement agent formed by gemini surfactants, which can quickly reduce the oil-water interfacial tension to 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 / water interfacial tens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584C09K2208/06
Inventor 李英路建
Owner SHANDONG UNIV
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