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Synergistic oil displacement agent containing oligomerized cation quaternary ammonium surfactant

A technology of surfactants and polycations, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of loss of foaming ability, performance reduction of foaming agent, corrosion, etc., to improve sweeping efficiency and strong Foam performance, the effect of enhancing oil recovery

Active Publication Date: 2019-07-26
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also defects in air foam flooding: first, for reservoirs with high temperature, high salinity, and high calcium and magnesium ions, the performance of the foaming agent will greatly increase with the increase of temperature, salinity, and calcium and magnesium ions. Secondly, some anionic foaming agents will completely lose their foaming ability in formation water containing high calcium and magnesium ions. This defect can be effectively alleviated by optimizing the structure and components of the foaming agent
[0008] However, compared with the instability at high temperature and high salinity, air foam is more fatal to the corrosion of injection and production systems, which has become one of the key factors restricting the development and application of air foam profile control and oil displacement
However, there are few reports on the corrosivity of foaming agents in the patent literature, including the above-mentioned patent application.

Method used

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  • Synergistic oil displacement agent containing oligomerized cation quaternary ammonium surfactant
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  • Synergistic oil displacement agent containing oligomerized cation quaternary ammonium surfactant

Examples

Experimental program
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Effect test

preparation example Construction

[0037] (2) Preparation of dimer quaternary ammonium salt surfactant: get intermediate 1.6g (6.0mmol), 1-bromododecane 6.0g (24.0mmol) (the number of carbon atoms n of the alkyl chain R of compound A is For other values, when X is other options, select the corresponding raw material to replace 1-bromododecane) Dissolve in methanol / acetone mixed solvent, react at 40°C for 72h. The solvent was removed by rotary evaporation, and the crude product was recrystallized in methanol / ethyl acetate to obtain a powdery product, Compound A.

[0038] Specifically, the preparation method of compound B (the carbon number n of the alkyl chain R is 12, and X is Br) is as follows:

[0039] (1) Synthesis of intermediate tripolyamide: 10.6 g (120.0 mmol) of N,N-dimethylethylenediamine was added to 2.3 g (10.0 mmol) of trimethyl citrate, and refluxed at 106° C. for 3 h. After the reaction, use a rotary evaporator to remove excess N,N-dimethylethylenediamine to obtain the intermediate;

[0040] (2)...

Embodiment 1

[0042] Preparation of embodiment 1 oil displacing agent and use effect evaluation

[0043] (1) Weigh 5g dodecyl dimethyl amine oxide, 0.3g Malic-2C 12 , 1.5g dodecyl dimethyl betaine, 0.25g soluble starch; add distilled water to 500mL, stir for 30min until completely dissolved, and get 500mL oil displacing agent.

[0044] (2) Take 100mL of oil displacement agent, and measure the foaming volume and foam half-life. The foaming volume of the oil-displacing agent is 1080mL, and the half-life of the foam is 560min; another 300mL of oil-displacing agent and 300mL of distilled water are taken to measure the corrosion rate respectively. The corrosion rates of distilled water and oil displacing agent are 6.10g / (m 2 h) and 0.0077g / (m 2 h), the corrosion inhibition rate of the oil displacement agent reaches 99.9%.

[0045] It can be seen that the oil displacing agent of the present invention has a good anti-corrosion effect.

Embodiment 2

[0046] Preparation of embodiment 2 oil displacing agent and use effect evaluation

[0047] (1) Weigh 1.25g dodecyl dimethyl amine oxide, 0.1g Malic-2C 12 , 0.25g dodecyl dimethyl betaine, 0.06g soluble starch; add distilled water to 500mL, stir for 30min until completely dissolved, and get 500mL oil displacing agent.

[0048] (2) Take 100mL of oil displacement agent, and measure the foaming volume and foam half-life. The foaming volume of the oil-displacing agent was 705mL, and the half-life of the foam was 375min; another 300mL of oil-displacing agent and 300mL of distilled water were taken to measure the corrosion rate respectively. The corrosion rates of distilled water and oil displacing agent are 6.04g / (m 2 h) and 0.025g / (m 2 h), the corrosion inhibition rate of the oil displacement agent reaches 99.6%.

[0049] It can be seen that the oil displacing agent of the present invention has a good anti-corrosion effect.

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Abstract

Discloses a synergistic oil displacement agent containing an oligomerized cation quaternary ammonium surfactant. The synergistic oil displacement agent comprises 0.05-2.5% of nonionic surfactant, 0.01-0.5% of oligomerized cation quaternary ammonium surfactant, 0.01-0.8% of ampholytic surfactant and 0.01-0.2% of large-molecule foam stabilizer. The oil displacement agent which is injected in a water-gas alternating manner during displacement is high in foaming performance and profile control oil displacement ability, extremely good in adaptability to common formation water and oil reservoirs containing high-calcium and magnesium-ion formation water, capable of evidently inhibiting air foam corrosion, capable of achieving fast foaming in a stratum, blocking gas channeling and regulating gas injection profile, and capable of evidently increasing oil recovery rate.

Description

technical field [0001] The invention relates to an oligomeric cationic quaternary ammonium salt surfactant synergistic oil-displacing agent, which has excellent foaming properties and stability under the conditions of ordinary formation water and high-salt, high-calcium-magnesium ion formation water It is suitable for foam profile control, oil flooding, and prevention of gas (steam) channeling, especially for air foam flooding to enhance oil recovery. Background technique [0002] Foam profile control and oil displacement are a process of injecting gas (or steam) into the formation and mixing with foaming agent to form foam to enhance oil recovery. Foam has high apparent viscosity and air resistance effect, which can inhibit gas channeling during gas injection and improve the oil-water mobility ratio. At the same time, the foam fluid is selective and can preferentially seal high-permeability layers and high-water-bearing layers. At the same time, the foam requires less chem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 孙焕泉乔富林祝仰文秦冰曹绪龙江建林石静高敏于群王红艳
Owner CHINA PETROLEUM & CHEM CORP
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