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Surface active agent composition for chemical displacement of reservoir oil and preparation method and application 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, difficulty in demulsification of corroded equipment and pipelines, damage to formations and oil wells, etc., to achieve High interface activity, beneficial to peeling and avoiding damage

Active Publication Date: 2014-12-24
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, provide a new surfactant composition for chemical flooding, which has high interface activity, strong oil washing ability, simple system, will not cause damage to formations and oil wells, and will not corrode equipment and pipelines and the advantages of not causing difficulty in demulsification

Method used

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  • Surface active agent composition for chemical displacement of reservoir oil and preparation method and application thereof
  • Surface active agent composition for chemical displacement of reservoir oil and preparation method and application thereof

Examples

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Effect test

Embodiment 1a

[0030] Alkylphenol polyoxypropylene ether (3), CH 3 CH=CH(CH 2 ) 9 SO 3 Na and HF equivalent to 5wt% of the total weight of the reaction raw materials are added to the reactor, at 50 o C reacted for 20 hours, wherein alkylphenol polyoxypropylene ether: CH 3 CH=CH(CH 2 ) 9 SO 3 Na molar ratio is 1:0.1, then add 30wt% NaOH aqueous solution to neutralize to pH = 8, and carry out oil-water separation, add 5wt% hydrochloric acid aqueous solution to acidify the water layer to pH value 3; stand still, carry out oil-water separation again; 10wt% NaOH aqueous solution was added to the oil phase to neutralize to a pH value of 8, and the water was removed in a vacuum to obtain an anionic-nonionic surfactant, sodium alkylphenol polyoxypropylene ether sulfonate.

[0031] Benzyltriethylammonium chloride and the alkylphenol polyoxypropylene ether sodium sulfonate surfactant prepared by the present invention were respectively dissolved in water, stirred for 30 minutes, and mixed with a...

Embodiment 2a

[0033] Alkylphenol polyoxypropylene (21) polyoxyethylene ether (42), CH 3 CH 2 CH=CH(CH 2 ) 10 SO 3 Na and ClSO equivalent to 2wt% of the total weight of the reaction raw materials 3 H was added to the reactor, at 150 o C reacted for 1 hour, wherein alkylphenol polyoxypropylene polyoxyethylene ether: CH 3 CH=CH(CH 2 ) 10 SO 3 The Na molar ratio is 1:0.2, and then add 10wt% ammonia water to neutralize to pH = 10, and carry out oil-water separation; add 5wt% hydrochloric acid aqueous solution to acidify the water layer until the pH value is 1, and let it stand; carry out oil-water separation again; then Add 10wt% ammonia water to the oil phase to neutralize to a pH value of 8, and remove moisture in a vacuum to obtain an anionic-nonionic surfactant, ammonium alkylphenol polyoxypropylene polyoxyethylene ether sulfonate.

[0034] Tetraoctyl ammonium chloride and the alkylphenol polyoxypropylene polyoxyethylene ether sulfonate ammonium surfactant prepared by the present in...

Embodiment 3a

[0037] Alkylphenol polyoxypropylene (16) polyoxyethylene ether (30.3), CH 3 (CH 2 ) 8 CH=CH(CH 2 ) 5 SO 3 Na and the p-toluenesulfonic acid that is equivalent to reaction raw material gross weight 4wt% add reactor, at 80 o C reacted for 12 hours, wherein alkylphenol polyoxypropylene polyoxyethylene ether: CH 3 (CH 2 ) 8 CH=CH(CH 2 ) 5 SO 3 The molar ratio of Na is 1:0.4, and then add a calcium hydroxide aqueous suspension with a concentration of 10wt% to neutralize to pH=9, and carry out oil-water separation; add 5wt% hydrochloric acid aqueous solution to the water layer to acidify to a pH value of 2, and let stand; Carry out oil-water separation; then add 10wt% calcium hydroxide aqueous suspension to the oil phase to neutralize to pH value 8, remove moisture in vacuum to obtain anionic-nonionic surfactant alkylphenol polyoxypropylene polyoxyethylene ether calcium sulfonate.

[0038] Phenyltrimethylammonium chloride and the alkylphenol polyoxypropylene polyoxyethyl...

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Abstract

The invention relates to a surface active agent composition for chemical displacement of reservoir oil, and a preparation method and application thereof, and mainly solves the problems of poor displacement efficiency in a tertiary oil recovery process, and harm to the stratum and the oil field, corrosion of equipment and pipeline and difficult demulsification due to oil inorganic alkali contained in displacement system. The invention adopts the surface active agent composition comprising a cationic surface active agent and an anionic-non-ionic surface active agent. The cationic surface active agent is at least one selected from the group consisting of quaternary ammonium salt or quaternary ammonium alkali; and the anionic-non-ionic surface active agent is represented by a molecular general formula shown as (A) or (B), wherein M represents one of an alkali metal, an alkaline earth metal and ammonium, m and n are selected from 0-14, and x and y are selected from 0-100. The technical scheme well solves the above problems, and can be used in tertiary oil recovery process.

Description

technical field [0001] The invention relates to a surfactant composition for chemical flooding, a preparation method and its application in tertiary oil recovery. 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 metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 李应成顾松园沙鸥沈之芹何秀娟
Owner CHINA PETROLEUM & CHEM CORP
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