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Viscosity reducer by emulsification for heavy oil

A technology of emulsification viscosity reduction and viscosity reduction agent, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of increasing the cost of emulsification viscosity reduction, unsuitable for super heavy oil viscosity reduction, and unsuitable compounds, etc. problem, to achieve the effect of low cost, high salt resistance and strong salt resistance

Active Publication Date: 2016-10-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Patent application US2007 / 0042911 discloses a heavy oil emulsifying viscosity reducer, a cross-linked polymer with polyvinyl alcohol as the backbone, which can reduce the viscosity of ordinary heavy oil to 200mPa.s under the condition of adding 0.5% About, but not suitable for viscosity reduction of super heavy oil
[0007] Patent application CN100363456C discloses a thick oil emulsifying viscosity reducer, which is a compound of anionic surfactant, nonionic-anionic surfactant and demulsifier. 30% heavy oil, the compound is still not applicable
[0008] Patent application CN102876310A discloses a thick oil emulsifying viscosity reducer, which is anionic surfactant, nonionic-anionic Gemini surfactant and C 1 -C 8 Alcohol compound can emulsify ultra-high viscosity heavy oil with asphaltene content > 30% under the dosage of 0.01%-5%, but the dosage is relatively high, which increases the cost of emulsification and viscosity reduction

Method used

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  • Viscosity reducer by emulsification for heavy oil
  • Viscosity reducer by emulsification for heavy oil
  • Viscosity reducer by emulsification for heavy oil

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preparation example Construction

[0038] Among the present invention, the preparation method of the anionic oligomeric surfactant having the structure shown in formula (I) preferably comprises: under Mannich reaction condition, alkali, taurine, formaldehyde and alkylphenol are mixed in organic solvent Carry out contact reaction in the mixed solvent that forms with water, wherein, described alkali is at least one in lithium hydroxide, sodium hydroxide and potassium hydroxide, and described alkylphenol is p-position alkylphenol, taurine The molar ratio of alkali, formaldehyde and alkylphenol is 1:1-3:2-3:1-2.

[0039] In the present invention, 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 the contact reaction.

[0040] In the present invention, the alkylphenol can be a conventional alkylphenol capable of forming anionic oligomeric surfactants of the fo...

preparation example 1

[0052] 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, after reacting at 25°C for 2 hours, add 275g of p-nonylphenol, heat to reflux, react for 4h, evaporate the solvent at 70°C and 0.03MPa, and obtain a viscous oily anionic oligomeric surfactant A1.

[0053] Carry out hydrogen spectrum, carbon spectrum and mass spectrometry respectively to anionic oligomeric surfactant A1, the hydrogen spectrum, carbon spectrum and mass spectrometry results of A1 are respectively as follows figure 1 , figure 2 , image 3 As shown, it can be drawn from the above spectrogram that the structural formula of A1 is as follows:

[0054]

preparation example 2

[0056] Use tetrahydrofuran and water as a mixed solvent (volume ratio 16:4), the amount of the mixed solvent is 150mL, add 48g of sodium hydroxide, 125g of aminoethanesulfonic acid and 63g of formaldehyde to it, and dissolve it completely at 30°C After reacting for 2 hours, add 275g of p-octylphenol and heat to reflux. After reacting for 6 hours, evaporate the solvent at 50°C and 0.01MPa to obtain viscous oily anionic oligomeric surfactant A2.

[0057] Carry out proton spectrum, carbon spectrum and mass spectrometry respectively to anionic oligomeric surfactant A2, wherein, the mass spectrometry result of A2 is as follows Figure 4 As shown, the hydrogen spectrum and the carbon spectrum spectrum diagram are not shown, it can be drawn from the above spectrum diagram that the structural formula of A2 is as follows:

[0058]

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Abstract

The invention relates to a viscosity reducer by emulsification for heavy oil. The viscosity reducer comprises the following components: a nonionic surfactant, an anionic oligomeric surfactant, alcohol and water; the alcohol is C1-C8 alcohol, the anionic oligomeric surfactant comprises 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 from Li+, Na+ and K+. The viscosity reducer by emulsification for heavy oil has the advantages of good viscosity reducing effects for heavy oil, good salt resistance, low usage concentration, and low cost; alkali is not needed during usage, and the viscosity reducer by emulsification for heavy oil is suitable for stratum which is sensitive to alkali.

Description

technical field [0001] The invention relates to a heavy oil emulsifying viscosity reducer, in particular to a heavy oil emulsifying viscosity reducer containing a specific anionic oligomeric surfactant. Background technique [0002] The emulsification viscosity reduction method has become a commonly used method in the production of heavy oil due to its strong operability in field implementation, flexible and diverse technologies, and strong adaptability to the environment. This method mainly refers to the adsorption of the emulsified viscosity reducer on the oil-water interface to reduce the oil-water interfacial tension, so that the heavy oil is transformed from a water-in-oil emulsified state into an oil-in-water emulsion, greatly reducing the viscosity and realizing normal production. Alkali is generally added to the emulsified viscosity reducer to reduce the amount of additional surfactant, but this method is not suitable for alkali-sensitive formations. [0003] On the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
Inventor 秦冰黄娟侯研博江建林罗咏涛
Owner CHINA PETROLEUM & CHEM CORP
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