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Surfactant composition for tertiary oil recovery and preparation method thereof

A technology of surfactant and composition, applied in the field of three-use surfactant composition and its preparation, can solve problems such as poor oil displacement efficiency, corrosion of equipment and pipelines, difficulty in demulsification, formation and oil well damage, etc., to achieve interfacial High activity, improving oil displacement efficiency and avoiding damage

Active Publication Date: 2014-01-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • 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 wells, corrode equipment and pipelines, and be difficult to break emulsion. the problem of providing a new three-use surfactant composition

Method used

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  • Surfactant composition for tertiary oil recovery and preparation method thereof
  • Surfactant composition for tertiary oil recovery and preparation method thereof
  • Surfactant composition for tertiary oil recovery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Will CH 3 CH 2 (OCH 2 CH 2 ) 0.1 CH 2 SO 3 Na, CH 3 (CH 2 ) 21 (OCH 2 CH 2 ) 20 CH 2 Add COONa, 2-pentadecyl-p-dichlorobenzene, NaOH and cyclohexane into the reaction kettle, and pass N 2 To pressure 35kg / cm 2 At 200 o C reacts for 2 hours, where CH 3 CH 2 (OCH 2 CH 2 ) 0.1 CH 2 SO 3 Na: CH 3 (CH 2 ) 21 (OCH 2 CH 2 ) 20 CH 2 The molar ratio of COONa: 4-pentadecyl-p-dichlorobenzene: NaOH is 1:1:5:4, and the amount of solvent cyclohexane is 4 times the total volume of the feed. After the reaction is over, add 1%Ca(HCO 3 ) 2 Dilute and separate oil and water to obtain anionic-nonionic surfactant from the water phase.

[0025] 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 1:0.6 and mixed uniformly to obtain...

Embodiment 2

[0028] Will CH 3 (CH 2 ) 5 OCH 2 CH 2 (CH 2 ) 2 SO 3 Na, CH 3 (CH 2 ) 5 (OCH 2 CH 2 ) 0.1 (CH 2 ) 2 COONa, 2-octyl-p-dichlorobenzene, NaOH and n-heptane are added to the reactor, and N 2 To pressure of 15kg / cm 2 At 80 o C reacts for 20 hours, where CH 3 (CH 2 ) 5 (OCH 2 CH 2 ) 1 (CH 2 ) 2 SO 3 Na: CH 3 (CH 2 ) 5 (OCH 2 CH 2 ) 0.1 (CH 2 ) 2 The molar ratio of COONa:2-octyl-p-dichlorobenzene:NaOH is 1:1:4:4, and the amount of solvent n-heptane is 4 times the total volume of the feed. After the reaction is completed, it is diluted with water to dissolve, and the oil and water are separated, and the anionic-nonionic surfactant is obtained from the water phase.

[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 1:0.1 and mixed...

Embodiment 3

[0032] Will CH 3 (CH 2 ) 21 (OCH 2 CH 2 ) 20 (CH 2 ) 5 SO 3 Na, CH 3 CH 2 (OCH 2 CH 2 ) 2.2 (CH 2 ) 5 COONa, 2-isopentyl-4-bromo-chlorobenzene, KOH and n-heptane are added to the reactor, and N 2 To pressure of 15kg / cm 2 At 100 o C reacts for 15 hours, where CH 3 (CH 2 ) 5 (OCH 2 CH 2 ) 1 (CH 2 ) 2 SO 3 Na: CH 3 CH 2 (OCH 2 CH 2 ) 2.2 (CH 2 ) 5 The molar ratio of COONa:2-isopentyl-4-bromo-chlorobenzene:KOH is 1:1:2:5, and the amount of solvent n-heptane is 4 times the total volume of the feed. After the reaction is completed, it is diluted with water to dissolve, and the oil and water are separated, and the anionic-nonionic surfactant is obtained from the water phase.

[0033] The tetraethylammonium 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 surfactant The molar ratio o...

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Abstract

The invention relates to a surfactant composition for tertiary oil recovery and a preparation method thereof, mainly for solving the problems that the existing surfactant has poor oil displacement efficiency in tertiary oil recovery, inorganic base contained in a displacement of reservoir oil system damages the stratum and oil wells, corrodes equipment and pipelines, and results in difficult emulsion breaking. The surfactant composition comprises a cationic surfactant and an anion-nonionic surfactant, wherein the cationic surfactant is any one of quaternary ammonium salt and quaternary amine alkali, the anion-nonionic surfactant contains ethyoxyl nonionic group and carboxyl or sulfonic acid group anionic group, and the molar ratio of the cationic surfactant to the anion-nonionic surfactant is 1:0.01-1:100. Due to adoption of the surfactant composition and the preparation method, the above problems can be well solved. The technical scheme can be used in the oil field tertiary oil production process.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 李应成翟晓东高磊李斌吴国英
Owner CHINA PETROLEUM & CHEM CORP
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