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Alkyl phenyl sulfonate surfactant, its preparation and application in tertiary oil extraction

A technology of alkylbenzene sulfonate and surfactant, which is applied in the application field of tertiary oil recovery, and can solve the problems of unfavorable large-area application of ternary composite system, high concentration of weak alkali, and damage to oil layers by strong alkali

Inactive Publication Date: 2003-07-02
DAQING OILFIELD CO LTD
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Problems solved by technology

[0002] At present, the alkali used in the ternary compound system is mainly NaOH, which will inevitably cause strong alkali damage to the oil layer and the occurrence of scaling during the oil displacement process, which is not conducive to the large-area application of the ternary compound system in oil fields.
Although there are surfactants suitable for weak bases, they are usually petroleum sulfonate or surfactants prepared by compounding, and the concentration of weak bases used is relatively high

Method used

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Examples

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Embodiment 1

[0020] The present invention will be further described below in conjunction with specific examples. The preparation of embodiment 1 alkylbenzene sulfonate surfactant

[0021] Alkylbenzenesulfonate surfactants are prepared in the following steps:

[0022] a) Choose C 10 -C 24 The heavy alkylbenzene between is used as raw material;

[0023] b) Sulfonation—at 45-50°C, with 20%-25% concentration of SO 3 The fuming sulfuric acid, according to the weight ratio of fuming sulfuric acid and heavy alkyl benzene is 0.8-1.2, the heavy alkyl benzene is sulfonated; then aging at sulfonation temperature for 0.2-0.4 hours, to obtain alkyl benzene sulfonic acid and sulfuric acid mixture;

[0024] c) Acid separation-add 15%-20% water to the mixture of alkylbenzenesulfonic acid and sulfuric acid at 60-65°C, and let the mixture stand for one hour to obtain the intermediate product alkylbenzenesulfonic acid;

[0025] d) Neutralization—at 40-50°C, use 20-25% sodium hydroxide solution to neutr...

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Abstract

An alkyl phenylsufonate (equivalent at 400-470) as surfactant suitable for weak alkali is prepared from the heavy alkyl phenyl group (between C10 and C24) through sulfonating reaction and compounding with alcohol (5-25%). Its advantages are easily available raw materials, low cost and high stability of product. It can be used to prepare a three-element composition for displacing petroleum with high recovey rate increased by 20% or more.

Description

technical field [0001] The present invention relates to the alkylbenzene sulfonate surfactant suitable for weak base and its preparation method and application for oil field, especially refers to the alkylbenzene sulfonate surfactant suitable for weak base, its preparation method and its three Applications in oil recovery. Background technique [0002] At present, the alkali used in the three-component compound system is mainly NaOH, which will inevitably cause damage to the oil layer and scaling phenomenon caused by strong alkali during the oil displacement process, which is not conducive to the large-scale application of the three-component compound system in the oil field. Although there are surfactants suitable for weak bases, they are usually petroleum sulfonate or surfactants prepared by compounding, and the concentration of weak bases used is relatively high. Contents of the invention [0003] The purpose of the present invention is to provide the alkylbenzenesulfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K23/12
Inventor 程杰成吴军政李佰林
Owner DAQING OILFIELD CO LTD
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