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Surfactant composition for enhanced oil recovery and preparation method thereof

A surfactant and enhanced oil recovery technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of corrosion equipment and pipeline demulsification difficulties, damage, poor oil displacement efficiency, etc., to facilitate stripping, Improved oil displacement efficiency and high interfacial activity

Active Publication Date: 2017-02-15
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. To solve the problem, a new composite surfactant composition is provided, which has high interfacial activity, strong oil washing ability, simple system, will not cause damage to formations and oil wells, will not corrode equipment and pipelines, and will not Advantages that can cause difficulty in demulsification

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0026] Will C 5 h 11 OH and NaOH are added to the reaction kettle according to the molar ratio of 1:5 and the required molar ratio of propylene oxide, at 200 o C reaction for 1 hour, and then according to C 5 h 11 OH and sodium chloroacetate molar ratio 1:1 add carboxylation reagent, at 50 o C continued to react for 20 hours, then added hydrochloric acid to neutralize to pH<3, stood to separate layers, and added 30% NaOH aqueous solution to the oil phase for neutralization to obtain an anionic-nonionic surfactant.

[0027] Dissolve phenyltrimethylammonium chloride and the anionic-nonionic surfactant prepared by the present invention in water respectively, stir for 30 minutes, and prepare a 0.3% aqueous solution, and then mix the above-mentioned surfactant according to cationic:anionic-nonionic surface The active agent molar ratio was 1:10 and mixed evenly to obtain surfactant composition 1, whose composition and structure are shown in Table 1.

Embodiment 2

[0029] Fatty alcohol polyoxyethylene ether C 20 h 41 (OCH 2 CH 2 ) 8.2 OH and KOH are added to the reaction kettle according to the molar ratio of 1:2.5 and the required molar ratio of propylene oxide, at 160 o C was reacted for 8 hours, and then followed by fatty alcohol polyoxyethylene ether: ClCH 2 CH 2 COOH molar ratio 1:1.5 add carboxylation reagent, at 100 o C continued to react for 1 hour, then added hydrochloric acid to neutralize to pH<3, and separated oil from water, added 30% KOH aqueous solution to the oil phase to neutralize, and finally obtained fatty alcohol polyoxyethylene ether / polyoxypropylene ether carboxylate.

[0030] Decyltriethylammonium hydroxide and the fatty alcohol polyoxyethylene ether / polyoxypropylene ether carboxylate surfactant prepared by the present invention were respectively dissolved in water, stirred for 30 minutes, and formulated into a 0.3% aqueous solution, and then the above-mentioned surface The active agent was uniformly mixed ...

Embodiment 3

[0032] Fatty alcohol polyoxyethylene ether C 14 h 29 (OCH 2 CH 2 ) 4.3 OH and NaOH are added to the reaction kettle according to the molar ratio of 1:4 and the required molar ratio of propylene oxide, at 150 o C was reacted for 8 hours, and then followed by fatty alcohol polyoxyethylene ether: ClCH 2 COOH molar ratio 1:1.5 add carboxylation reagent, at 70 o C continued to react for 8 hours, then added hydrochloric acid to neutralize to pH3 ) 2 Neutralization is carried out to finally obtain fatty alcohol polyoxyethylene ether / polyoxypropylene ether carboxylate.

[0033] Tetraethylammonium chloride and the fatty alcohol polyoxyethylene ether / polyoxypropylene ether carboxylate surfactant prepared by the present invention were dissolved in water respectively, stirred for 30 minutes, and were mixed with 0.3% aqueous solution, and then the above surfactant According to the cation:anion-nonionic surfactant molar ratio of 1:1.3, the surfactant composition 3 was obtained, whose...

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Abstract

The invention relates to a surfactant composition for intensified oil production 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 for intensified oil production 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 is any one of fatty alcohol polyoxyethylene / polypropylene ether carboxylate and fatty alcohol polyoxyethylene ether / polypropylene ether sulfonate, 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 techcnial scheme can be used in the oil field intensified oil production process.

Description

technical field [0001] The invention relates to a surfactant composition for enhanced 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, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 李应成鲍新宁唐恒志陈安猛王辉辉
Owner CHINA PETROLEUM & CHEM CORP
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