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A kind of composite blowing agent and its application

A technology of composite foaming agent and foam stabilizer, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of reducing the amount of surfactant added, difficulty in oil-water emulsification and processing, and poor stability of foaming agent. , to achieve the effect of small dosage, high stability and good foaming performance

Active Publication Date: 2018-09-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the anion-nonionic surfactant used in this invention also has the following problems of oil-water emulsification and processing difficulties. At the same time, the anion-nonionic surfactant in the foaming agent has a high affinity with the rock in the formation, causing adsorption loss , the actual amount of surfactant added is significantly reduced, and the possibility of foam formation in the formation is reduced in actual application
[0007] Moreover, the existing foaming agent also has the problem of poor stability, which in turn affects its foaming performance.

Method used

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  • A kind of composite blowing agent and its application
  • A kind of composite blowing agent and its application
  • A kind of composite blowing agent and its application

Examples

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preparation example Construction

[0031]In the present invention, there is no special requirement for the preparation method of the anionic oligomeric surfactant having the structure shown in formula (I), and various methods that those skilled in the art can think of can be adopted, preferably comprising: in the Mannich reaction Under conditions, alkali, taurine, formaldehyde and alkylphenol are carried out contact reaction in the mixed solvent that organic solvent and water form, and wherein, described alkali is lithium hydroxide, sodium hydroxide and potassium hydroxide at least One, the alkylphenol is p-alkylphenol, and the molar ratio of taurine, alkali, formaldehyde and alkylphenol is 1:1-3:2-3:1-2.

[0032] According to the preparation method of the present invention, wherein, preferably, under Mannich reaction conditions, the alkali, taurine and formaldehyde are first dissolved in a mixed solvent formed of an organic solvent and water, and then an alkylphenol is added to carry out contact reaction.

[...

preparation example 1

[0045] Use ethylene glycol monomethyl ether and water as a mixed solvent (volume ratio of 7:3), the amount of the mixed solvent is 200mL, add 64g of potassium hydroxide, 125g of taurine and 63g of formaldehyde to dissolve completely Finally, 275g of p-nonylphenol was added, reacted at 25°C for 6 hours, then heated to reflux, and after reflux for 4h, the solvent was evaporated at 70°C and 0.03MPa to obtain anionic oligomeric surfactant A1.

[0046] The hydrogen spectrum, carbon spectrum and mass spectrometry were carried out on A1, and the results of the hydrogen spectrum, carbon spectrum and mass spectrometry of A1 were as follows: figure 1 , figure 2 with image 3 As shown, it can be inferred that the structural formula of A1 is as follows (that is, equivalent to structural formula (I), n is 3, R is nonyl, and M is K + ).

[0047]

preparation example 2

[0049] With tetrahydrofuran and water as a mixed solvent (volume ratio of 4:1), the amount of the mixed solvent is 150mL, 48g of sodium hydroxide, 125g of taurine and 63g of formaldehyde are added thereto, after completely dissolving, add 275g of For p-octylphenol, react at 30°C for 7 hours, then heat to reflux, and after reflux for 6 hours, evaporate the solvent at 50°C and 0.01MPa to obtain anionic oligomeric surfactant A2.

[0050] Carry out hydrogen spectrum, carbon spectrum and mass spectrometry respectively to A2, hydrogen spectrum, carbon spectrum and mass spectrogram are not listed, deduce the structure of A2 through the spectrogram of determination as shown in formula (I), wherein, n is 2, R is octyl, M is Na + .

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Abstract

The invention relates to a composite foaming agent. The composite foaming agent is prepared from an anionic oligomeric surfactant, an organic foam stabilizer and water. The nionic oligomeric surfactant is of a structure shown in the formula (I), wherein n is any integer from 1 to 6, R is alkyl, and M is at least one of Li+, Na+ and K+. The invention also relates to application of the composite foaming agent to carbon dioxide oil driving. The composite foaming agent is low in using amount and good in thickening performance when the composite foaming agent is actually used; the composite foaming agent is used for carbon dioxide oil driving, and formed milky liquid is prone to emulsion breaking, and the composite foaming agent is good in stability and foaming performance, wide in application range and capable of being applied to the field of carbon dioxide oil driving. The formula is defined in the description.

Description

technical field [0001] The invention relates to a composite foaming agent and the application of the composite foaming agent in carbon dioxide flooding. Background technique [0002] Currently, about 75% of the world's EOR projects inject steam, carbon dioxide and light hydrocarbons. Among them, carbon dioxide flooding has always been valued by the industry, whether it is used as a secondary oil recovery or an enhanced oil recovery method after water flooding. Carbon dioxide flooding technology is to inject carbon dioxide into the oil reservoir as an oil displacement agent. Carbon dioxide can reduce the viscosity of crude oil, improve the oil-water mobility ratio, and expand the volume of crude oil, thereby increasing the energy of the oil reservoir and improving the efficiency of oil and gas recovery. In the 1950s and 1960s, due to the abundance of gas sources, a large number of field tests were carried out in the United States and Canada. In 2005, for the first time in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/594C09K8/584
CPCC09K8/584C09K8/594
Inventor 秦冰黄娟侯研博王征李伟
Owner CHINA PETROLEUM & CHEM CORP
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