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Surfactant composition for intensifying oil extraction 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 poor oil displacement efficiency, corrosion equipment and pipeline demulsification difficulties, etc., achieve high interfacial activity, improve displacement Oil efficiency, the effect of overcoming cohesion

Active Publication Date: 2014-03-26
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 process of enhanced oil recovery, 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 pipelines, and be difficult to break emulsion To solve the problem, a new surfactant composition is provided, which has high interface 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 cause Advantages of Difficult Demulsification

Method used

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  • Surfactant composition for intensifying oil extraction and preparation method thereof
  • Surfactant composition for intensifying oil extraction and preparation method thereof
  • Surfactant composition for intensifying oil extraction and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Add oleic acid glyceride and KOH into the reaction kettle according to the molar ratio of 1:3, stir for 30 minutes, and then add the required ethylene oxide and propylene oxide, at 200 o C was reacted for 1 hour; then chloroacetic acid was added according to the molar ratio of glycerol oleate and carboxylation reagent at 1:1, at 80 o After C continued to react for 20 hours, hydrochloric acid was added to neutralize to pH<3, and the layers were separated after standing, and the oil phase was neutralized by adding 30% KOH aqueous solution to obtain an anionic-nonionic surfactant.

[0027] Tetraethylammonium chloride and the anionic-nonionic 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 surfactant was mixed according to cationic:anionic-nonionic surfactant The molar ratio of 1:0.1 was mixed evenly to obtain surfactant composition 1, whose c...

Embodiment 2

[0030] Add methyl oleate and KOH into the reaction kettle according to the molar ratio of 1:1.8, stir for 30 minutes, then add the required ethylene oxide and propylene oxide, at 100 o C was reacted for 20 hours; then sodium chloroacetate was added according to the molar ratio of methyl oleate to carboxylation reagent 1:1.5, at 80 o C continued to react for 8 hours, and finally added hydrochloric acid to neutralize to pH3 ) 2 The aqueous solution is neutralized to obtain anionic-nonionic surfactant.

[0031] Decyltriethylammonium hydroxide and the anionic-nonionic surfactant prepared by the present invention were dissolved in water respectively, stirred for 30 minutes, and formulated into a 0.3% aqueous solution, and then the above-mentioned surfactant was mixed according to cationic: anionic-nonionic surface Active agent molar ratio 1:0.4 was mixed evenly to obtain surfactant composition 2, whose composition and structure are shown in Table 1.

[0032]

Embodiment 3

[0034] Add methyl stearate and NaOH into the reaction kettle according to the molar ratio of 1:3, then add the required ethylene oxide and propylene oxide, at 150 o C was reacted for 15 hours; then sodium isethionate was added according to the molar ratio of methyl stearate to sulfonating reagent 1:3, at 180 o C continued to react for 3 hours, finally added hydrochloric acid to neutralize to pH3 ) 2 The aqueous solution is neutralized to obtain anionic-nonionic surfactant.

[0035] 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 uniformly to obtain surfactant composition 3, whose composition and structure are shown in Table 1.

[0036]

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Abstract

The invention relates to a surfactant composition for intensifying oil extraction and a preparation method thereof, and is mainly used for solving the problems that the existing surfactant is poor in flushing efficiency in three oil extraction processes, and meanwhile, a drive system contains an inorganic base, resulting in damage to a stratum and an oil well, corrosion to equipment and pipeline, and demulsification difficulty. The problems are well solved by adopting the technical scheme of the surfactant composition and the preparation method thereof, wherein the surfactant composition comprises a cationic surfactant and an anion-nonionic surfactant; the cationic surfactant is selected from at least one of a quaternary ammonium salt or quaternary amine alkali; the anion-nonionic surfactant is any one of fatty alcohol-polyoxyethylene / polyoxypropylene ether carboxylate and sulfonate; the molar ratio of the cationic surfactant to the anion-nonionic surfactant is 1:0.01 to 1:100. The surfactant composition can be applied to the oilfield oil extraction intensifying 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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IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 李应成张卫东沈之芹沙鸥何秀娟
Owner CHINA PETROLEUM & CHEM CORP
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