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Efficient surfactant composition for oil displacement and preparation method of composition

A surfactant and composition technology, applied in the field of high-efficiency oil displacement surfactant composition and its preparation, can solve problems such as corrosion of equipment and pipelines, difficulties in demulsification, damage to formations and oil wells, and low use concentration, and achieve The effect of high interface activity, avoiding damage, and strong oil washing ability

Inactive Publication Date: 2018-03-23
展红明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 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 high-efficiency oil displacement surfactant composition is provided, which has the advantages of low concentration, high oil displacement efficiency, no damage to formations and oil wells, and no corrosion of equipment and pipelines; The second technical problem to be solved by the present invention is to provide a preparation method of a surfactant composition corresponding to the first technical problem

Method used

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  • Efficient surfactant composition for oil displacement and preparation method of composition

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Effect test

Embodiment 1

[0017] Add CH3(CH2)2CH=CH(CH2)6OH and NaOH to the reaction kettle according to the molar ratio of 1:1.5, stir for 30 minutes, add the required ethylene oxide, and react at 200oC for 1 hour; Add pentadecyl substituted benzenesulfonic acid at a molar ratio of 1:4, continue the reaction at 50oC for 20 hours, then add 5% KOH aqueous solution to neutralize to pH>10, let stand to separate, add 10% NaOH to the oil phase Hydrolyze at 100oC for 20 hours to obtain polyoxyethylene ether sulfonate anionic-nonionic surfactant; cetyltrimethylammonium chloride and the anionic-nonionic surfactant prepared by the present invention are dissolved in water respectively, Stir for 30 minutes, prepare 0.3% aqueous solution, then mix the above-mentioned surfactants according to cation: anion-nonionic surfactant molar ratio 1: 0.4, obtain surfactant composition 1, its composition and structure are shown in Table 1.

Embodiment 2

[0019]Add CH3CH=CH(CH2)9OH and NaOH to the reactor according to the molar ratio of 1:4, stir for 30 minutes, add the required ethylene oxide, and react at 100oC for 20 hours; Add octylbenzenesulfonic acid at a molar ratio of 1:6, continue the reaction at 200oC for 1 hour, then add 10% NaOH aqueous solution to neutralize to pH>10, let stand to separate, add 10% ammonia water to the oil phase and hydrolyze at 300oC for 5 hours, Obtain polyoxyethylene ether sulfonate anionic-nonionic surfactant; Tetraethylammonium chloride and the anionic-nonionic surfactant prepared by the present invention are dissolved in water respectively, stir 30 minutes, be mixed with 0.3% aqueous solution, Then the above-mentioned surfactants were uniformly mixed according to the cationic:anionic-nonionic surfactant molar ratio of 1:0.1 to obtain surfactant composition 2, whose composition and structure are shown in Table 1.

Embodiment 3

[0021] Add CH3(CH2)3CH=CH(CH2)4OH and KOH to the reactor according to the molar ratio of 1:1.5, stir for 30 minutes, add the required ethylene oxide, and react at 160oC for 6 hours; Add pentyl-substituted benzenesulfonic acid at a molar ratio of 1:3 to benzenesulfonic acid, continue the reaction at 100oC for 12 hours, then add 5% NaOH aqueous solution to neutralize to pH > 10, let stand to separate, add 30% NaOH to the oil phase 200oC hydrolysis for 15 hours to obtain polyoxyethylene ether sulfonate anionic-nonionic surfactant; tetrabutylammonium chloride and the anionic-nonionic surfactant prepared by the present invention were dissolved in water respectively, stirred for 30 minutes, and prepared into a 0.3% aqueous solution, and then the above-mentioned surfactants were mixed uniformly according to the cation:anion-nonionic surfactant molar ratio of 1:1.3 to obtain surfactant composition 3, whose composition and structure are shown in Table 1.

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Abstract

The invention relates to efficient surfactant composition for oil displacement and a preparation method of the composition and mainly solves the problems that existing surfactants have poor oil displacement efficiency in the tertiary oil recovery process, an oil displacement system damages strata and oil wells, corrodes equipment and pipelines and demulsification is difficult because of inorganicbase contained in the oil displacement system. The efficient surfactant composition for oil displacement comprises a cationic surfactant and an anion-non-ionic surfactant, wherein the cationic surfactant is selected from any one of quaternary ammonium salt and quaternary amine alkali, the anion-non-ionic surfactant is a surfactant containing ethyoxyl nonionic groups and carboxyl or sulfonyl anionic groups, and the mole ratio of the cationic surfactant to the anion-non-ionic surfactant is (1:0.01)-(1:100). By means of the technical scheme of the preparation method, the problem is better solved,and the efficient surfactant composition can be used for the tertiary oil recovery process of the oil field.

Description

technical field [0001] The invention relates to a high-efficiency oil displacement surfactant composition 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 recove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 展红明
Owner 展红明
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