Application of iturins sodium surfactin as oil displacement agent and oil displacement agent containing iturins sodium surfactin

A technology of sodium subtilisin and oil-displacing agent, which is applied in the field of oil-displacing agent containing sodium subtilisin as oil-displacing agent, can solve the problem that the oil-displacing ultra-low oil-water interfacial tension cannot be achieved , block formation pores, formation structure damage and other problems, to achieve the effect of improving oil recovery, reducing consumption and avoiding damage

Inactive Publication Date: 2014-11-19
安徽帝元生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, petroleum sulfonate generally only reduces the oil/water interfacial tension to 1×10 -2 On the order of mN/m, it cannot meet the requirements of ultra-low oil-water interfacial tension required for oil displacement
In order to pursue low oil-water interfacial tension, the traditional oil displacement agent does not pay attention to the geological conditions of the reservoir and the ph...

Method used

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  • Application of iturins sodium surfactin as oil displacement agent and oil displacement agent containing iturins sodium surfactin
  • Application of iturins sodium surfactin as oil displacement agent and oil displacement agent containing iturins sodium surfactin
  • Application of iturins sodium surfactin as oil displacement agent and oil displacement agent containing iturins sodium surfactin

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Example 1: Detection of the interfacial tension of different concentrations of subtilisin sodium

[0051] Test instrument: Model510 rotating drop interfacial tension meter (SY / T5370-1999);

[0052] Temperature: 55℃;

[0053] Crude oil: experimental standard crude oil (Ma 95 fault block in Renqiu Oilfield, North China);

[0054] Water: formation water (provided by the oilfield manufacturer, belonging to NaHCO 3 type);

[0055] Oil-displacing agent composition: different concentrations of subtilisin sodium;

[0056] The interfacial tension of different concentrations of subtilisin lipopeptide sodium was calculated, and the results are shown in Table 1.

[0057] Table 1 Interfacial tension

[0058] Concentration of subtilis lipopeptide sodium (ppm)

[0059] The results show that subtilisin lipopeptide sodium can reach 10% in a small concentration range (500ppm) when it is used alone without the addition of alkali and organic solvents and other oil-displacing substances. -3 The oil / w...

Embodiment 2

[0060] Example 2: Thermal stability of subtilis lipopeptide sodium

[0061] Under the conditions of the oil field simulated in the laboratory, add 500ppm of subtilisin sodium, then put it in an oven (105℃) for 60min, then transfer to the refrigerator to instantly drop below 5℃, observe the subtilisin The transparency of sodium in the beaker showed no precipitation. It shows that subtilis lipopeptide sodium has good thermal stability as an oil-displacing agent.

Embodiment 3

[0062] Example 3: The composite oil displacement agent of the present invention

[0063] A composite oil-displacing agent is composed of the following components by weight percentage: subtilisin sodium 5%, sodium dodecylbenzene sulfonate 20%, tetradecyl dimethyl betaine 20%, isopropanol 10% , Water 45%.

[0064] The preparation method is to fully stir the subtilisin sodium, sodium dodecylbenzene sulfonate, and tetradecyl dimethyl betaine under normal temperature and pressure for 45 minutes, and then mix with 50% water of the total water and stir for 30 minutes. Finally, add isopropanol and stir for 45 minutes, add the remaining 50% water, and stir well to get it.

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Abstract

The invention belongs to the petroleum exploitation field, and discloses an application of iturins sodium surfactin as an oil displacement agent and the oil displacement agent containing iturins sodium surfactin. According to the invention, iturins sodium surfactin as the oil displacement agent has good thermostability and no chromatogram separating phenomenon, alkali and an organic solvent are not added, so that low oil/water interfacial tension can be reached in a small concentration scope, crude oil can be cleaned from the stratum surface, oil displacement efficiency is increased, crude oil recovery efficiency is increased, damage of an alkalescence body to an oil layer can be avoided, and the continuous development for petroleum exploitation can be realized. The composite oil displacement agent comprises iturins sodium surfactin, iturins sodium surfactin has good compatibleness with the chemical oil displacement agent, amount of the chemical oil displacement agent can be obviously reduced when the interfacial tension can reach low level, recovery efficiency of three-time oil extraction of an oil field can be increased, and the cost for three-time oil extraction can be simultaneously and effectively increased.

Description

Technical field [0001] The invention belongs to the field of petroleum exploitation, and specifically relates to the use of subtilisin sodium as an oil-displacing agent and an oil-displacing agent containing subtilisin sodium. Background technique [0002] As an extremely important energy and chemical raw material, petroleum is continuously increasing in demand worldwide. Especially in my country, on the one hand, the growth rate of oil demand for national economic development is greater than ever before; on the other hand, after decades of development in my country’s major oil fields, most of the remaining reserves are concentrated in high water cut and low permeability. , Heavy oil, high-temperature and high-salt oil reservoirs, and extremely heterogeneous carbonate fractured-cavity reservoirs, etc., where the production decline has increased, and the reserve reserves are seriously insufficient. The contradiction between oil supply and demand has become increasingly prominent. ....

Claims

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Application Information

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IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 孙文朱仁发丁仕奇王元晨
Owner 安徽帝元生物科技有限公司
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