Surfactant composition for chemical displacement of reservoir oil and preparation method thereof

A surfactant and chemical flooding technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as poor oil flooding efficiency, corrosion equipment and pipeline demulsification difficulties, damage, etc., and achieve high interfacial activity , Facilitate stripping and improve oil displacement efficiency

Active Publication Date: 2014-01-29
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
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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 chemical displacement of reservoir oil and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] Alkylphenol polyoxyethylene ether (1), CH 3 CH=CH(CH 2 ) 9 SO 3 Na and 5wt%HF add reactor, at 50o C reacted for 20 hours, wherein alkylphenol polyoxyethylene ether (1): CH 3 CH=CH(CH 2 ) 9 SO 3 The molar ratio of Na is 1:0.1, and then 30% NaOH is added to neutralize, and the oil and water are separated, and the water phase is obtained as an anionic-nonionic surfactant.

[0025] Benzyltriethylammonium chloride and the alkylaryl polyoxyethylene ether sodium sulfonate surfactant prepared by the present invention were respectively dissolved in water, stirred for 30 minutes, and mixed with 0.3% aqueous solution, and then the above surfactant was prepared according to Cationic:anionic-nonionic surfactant molar ratio 1:0.1 was mixed evenly to obtain surfactant composition 1, whose composition and structure are shown in Table 1.

Embodiment 2

[0027] Alkylphenol polyoxyethylene ether (4), CH 3 CH 2 CH=CH(CH 2 ) 10 SO 3 Na and 2wt%ClSO 3 H was added to the reactor, at 150 o C reacted for 1 hour, wherein alkylphenol polyoxyethylene ether (4): CH 3 CH=CH(CH 2 ) 10 SO 3 The molar ratio of Na is 1:0.2, and then ammonia water is added to neutralize, and oil and water are separated, and anionic-nonionic surfactants are obtained from the aqueous phase.

[0028] Tetraoctyl ammonium chloride and the alkylaryl polyoxyethylene ether sodium sulfonate 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 used according to the cationic: Anionic-nonionic surfactant molar ratio 1:0.7 was mixed evenly to obtain surfactant composition 2, whose composition and structure are shown in Table 1.

[0029]

Embodiment 3

[0031] Alkylphenol polyoxyethylene ether (7.3), CH 3 (CH 2 ) 8 CH=CH(CH 2 ) 5 SO 3 Na and 4wt% p-toluenesulfonic acid add reactor, at 80 o C reacted for 12 hours, wherein alkylphenol polyoxyethylene ether (7.3): CH 3 (CH 2 ) 8 CH=CH(CH 2 ) 5 SO 3 Na molar ratio is 1:0.4, then add 10% Ca(HCO 3 ) 2 Neutralize, and carry out oil-water separation, the water phase obtains anionic-nonionic surfactant.

[0032] Phenyltrimethylammonium chloride and the alkyl aryl polyoxyethylene ether sodium sulfonate 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 was prepared according to Cationic:anionic-nonionic surfactant molar ratio 1:1.4 was evenly mixed to obtain surfactant composition 3, whose composition and structure are shown in Table 1.

[0033]

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Abstract

The invention relates to a surfactant composition for chemical displacement of reservoir oil and a preparation method thereof, mainly for solving the problems that the conventional surfactant is poor in oil displacement efficiency in the tertiary oil recovery process and an oil displacement system containing inorganic base damages stratums and oil wells, corrodes equipment and pipelines and results in difficult demulsification. The surfactant composition provided by the invention comprises a cationic surfactant and an anionic-nonionic surfactant, wherein the cationic surfactant is at least one of quaternary ammonium salt and quaternary ammonium alkali; the anionic-nonionic surfactant is a surfactant containing an ethyoxyl nonionic group and a carboxyl or sulfonic acid group anionic group; and the molar ratio of the cationic surfactant to the anionic-nonionic surfactant is (1:0.01)-(1:100); and by the adoption of the surfactant composition and the preparation method of the surfactant composition, the above problems can be well solved. The surfactant composition can be applied to tertiary oil recovery process of an oil field.

Description

technical field [0001] The invention relates to a surfactant composition for chemical oil flooding 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 Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 李应成翟晓东陈安猛唐恒志王辉辉
Owner CHINA PETROLEUM & CHEM CORP
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