Surfactant composition for tertiary oil recovery and preparation method thereof

A technology of surfactant and composition, applied in the field of surfactant composition and preparation thereof, can solve the problems of difficult demulsification of corrosion equipment and pipelines, poor oil displacement efficiency, etc., and achieves improved oil displacement efficiency, high interfacial activity, Enhanced recovery effect

Active Publication Date: 2017-02-08
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 well, corrode equipment and pipelines, and be difficult to break emulsion To solve the problem, provide a surfactant composition, 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 demulsification Difficult Advantage

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
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Effect test

Embodiment 1

[0025]Add dodecylamine and KOH to the reaction kettle according to the molar ratio of 1:2, stir for 30 minutes, 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 dodecylamine and carboxylating reagent 1:1, at 50 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.

[0026] Dissolve octadecyl dimethyl benzyl ammonium 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 surfactants according to cationic: anionic - The molar ratio of non-ionic surfactants is 1:0.1 and mixed evenly to obtain surfactant composition 1, whose composition and structure are ...

Embodiment 2

[0028] Add o-phenylaniline and NaOH to the reaction kettle according to the molar ratio of 1:6, stir for 30 minutes, then add the required ethylene oxide and propylene oxide, at 100 o C was reacted for 20 hours; then chlorosulfonic acid was added according to the molar ratio of o-phenylaniline and sulfonating reagent 1:4, at 120 o After C continued to react for 14 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% NaOH aqueous solution to obtain an anionic-nonionic surfactant.

[0029] Tetrabutylammonium 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 1:0.5 was mixed evenly to obtain surfactant composition 2, whose compositi...

Embodiment 3

[0031] Add cyclohexylamine and NaOH to the reaction kettle according to the molar ratio of 1:4, stir for 30 minutes, then add the required ethylene oxide and propylene oxide, at 160 o C was reacted for 2 hours; then sodium chloropentyl sulfonate was added according to the molar ratio of cyclohexylamine to sulfonating reagent 1:2.5, at 120 o After C continued to react for 14 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% NaOH aqueous solution to obtain an anionic-nonionic surfactant.

[0032] Tetraoctyl ammonium chloride 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 surfactant The molar ratio of 1:10 was mixed evenly to obtain surfactant composition 3, whose...

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Abstract

The invention relates to a surfactant composition used for tertiary oil recovery and a preparation method thereof, mainly solving a problem of the low oil displacement efficiency of surfactants at present in tertiary oil recovery processes and problems of damage to stratums and oil wells, equipment and pipeline corrosion and difficult demulsification which are caused by inorganic bases in oil displacement systems. According to the technical scheme adopted by the surfactant composition and the preparation method, the surfactant composition comprises a cationic surfactant and an anionic-nonionic surfactant, wherein the cationic surfactant is at least one selected from a quaternary ammonium salt or a quaternary amine alkali, the anionic-nonionic surfactant is at least one of an amidogen ether carboxylate or an amidogen ether sulphonate, and the molar ratio of the cationic surfactant to the anionic-nonionic surfactant is 1:0.01-1:100. By the technical scheme, the problems are solved well and the surfactant composition can be used in enhanced oil recovery of an oil field.

Description

technical field [0001] The invention relates to a surfactant composition for tertiary 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 李应成张卫东沙鸥沈之芹邓舜
Owner CHINA PETROLEUM & CHEM CORP
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