Surfactant combination for enhancing oil recovery and preparation method thereof

A surfactant and recovery technology, applied in the field of surfactant composition, can solve problems such as damage, corrosion equipment and pipeline demulsification difficulties, poor oil displacement efficiency, etc., to achieve improved oil displacement efficiency, high interfacial activity, The effect of enhanced oil recovery

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] One of the technical problems to be solved by the present invention is that the existing surfactants have poor oil displacement efficiency in the tertiary oil recovery process, and at the same time, because the oil displacement system contains inorganic alkali, it will cause damage to the formation and oil well, corrode equipment and pipeli

Method used

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  • Surfactant combination for enhancing oil recovery and preparation method thereof

Examples

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Comparison scheme
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Example Embodiment

[0023] [Example 1]

[0024] Add sodium 2-pentadecyl-4-hydroxybenzene sulfonate and NaOH into the reaction kettle at a molar ratio of 1:3, stir for 30 minutes, and then add the required ethylene oxide at 300 o C react for 5 hours; then add hydrochloric acid to neutralize to pH <3, stand for stratification, add 30% NaOH aqueous solution to the oil phase for neutralization to obtain an anionic-nonionic surfactant.

[0025] The benzyltriethylammonium chloride and the anionic-nonionic surfactant prepared by the present invention were separately dissolved in water, stirred for 30 minutes to prepare a 0.3% aqueous solution, and then the above-mentioned surfactants were treated as cationic: anionic-nonionic surface The active agent molar ratio is 1:0.1 and mixed uniformly to obtain surfactant composition 1, whose composition and structure are shown in Table 1.

[0026]

Example Embodiment

[0027] [Example 2]

[0028] Add sodium 4-octyl-2-hydroxybenzene sulfonate and NaOH into the reaction kettle according to the molar ratio of 1:2, stir for 30 minutes, and then add the required ethylene oxide at 150 o C react for 20 hours; then add hydrochloric acid to neutralize to pH <3, stand for stratification, add ammonia water to the oil phase for neutralization to obtain anionic-nonionic surfactant.

[0029] Dissolve decyltriethylammonium hydroxide and the anionic-nonionic surfactant prepared by the present invention in water respectively, stir for 30 minutes to prepare a 0.3% aqueous solution, and then apply the above-mentioned surfactant to cationic: anionic-nonionic surface The active agent molar ratio is 1:0.4 and mixed uniformly to obtain the surfactant composition 2. The composition and structure are shown in Table 1.

[0030]

Example Embodiment

[0031] [Example 3]

[0032] Add sodium 4-hydroxybenzene sulfonate and NaOH into the reaction kettle according to the molar ratio of 1:3, stir for 30 minutes, and then add the required ethylene oxide. o C react for 25 hours; then add hydrochloric acid to neutralize to pH <3, stand for stratification, add 30% NaOH aqueous solution to the oil phase for neutralization to obtain an anionic-nonionic surfactant.

[0033] Phenyltrimethylammonium chloride and the anionic-nonionic surfactant prepared by the present invention were separately dissolved in water, stirred for 30 minutes to prepare a 0.3% aqueous solution, and then the above-mentioned surfactants were treated as cationic: anionic-nonionic surface The active agent molar ratio is 1:0.8 and mixed uniformly to obtain surfactant composition 3, the composition and structure of which are shown in Table 1.

[0034]

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Abstract

The invention relates to a surfactant combination for enhancing oil recovery and a preparation method thereof, and mainly solves the problem of low oil displacement efficiency in the tertiary recovery process in the existing surfactants and the problem of damage to stratums and oil wells, corrosion of equipment and pipes and difficulty in demulsification because inorganic base is contained in oil displacement systems. The surfactant combination comprises a cationic surfactant and an anionic-nonionic surfactant, wherein the cationic surfactant is selected from any one of quaternary ammonium salt and quaternary ammonium alkali; the anionic-nonionic surfactant is a surfactant containing ethoxy nonionic groups and carboxyl or sulfo anionic groups; the mol ratio of the cationic surfactant to the anionic-nonionic surfactant is (1:0.01) to (1:100). The surfactant combination and the preparation method thereof preferably solve the problems, and can be applied to the tertiary recovery process of oil fields.

Description

technical field [0001] The invention relates to a surfactant composition for enhancing oil recovery and a preparation method thereof. Background technique [0002] With the increase of the world's energy demand, the rational development and utilization of oil has attracted great attention, and the requirements for the amount and efficiency of oil extraction are also getting higher and higher. Realizing the efficient exploitation of oil and gas resources not only has practical significance for increasing crude oil production, but also has important strategic significance. Conventional oil recovery methods (primary and secondary methods) generally only produce 1 / 3 of the crude oil geological reserves, and about 2 / 3 of the crude oil has not been recovered. Therefore, in the case of increasingly tight energy sources, enhanced oil recovery has become a A major topic of oil exploration research. Tertiary oil recovery technology is an effective method to increase oil recovery, wh...

Claims

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Application Information

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IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 李应成张卫东何秀娟鲍新宁李斌
Owner CHINA PETROLEUM & CHEM CORP
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