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High-salt reservoir enhanced foam flooding composition and preparation method

A composition and foam technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of high resistance factor, corroded equipment and pipelines, insufficient plugging performance, etc. The effect of bubble ability and damage avoidance

Active Publication Date: 2017-02-15
CHINA PETROLEUM & CHEM CORP +1
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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 enhanced foam system existing in the foam flooding recovery process of existing high-salt reservoirs encounters high salinity precipitation, forming poor foam stability and insufficient plugging performance. At the same time, because the enhanced foam system contains inorganic Alkali, alcohol, etc., will cause damage to formations and oil wells, corrode equipment and pipelines, and provide a new enhanced foam composition, which has the ability to form foam under the condition of formation water with a salinity of 10,000~300,000mg / L It has the advantages of good foam stability, high resistance factor, no alkali in the system, no corrosion of equipment and pipelines, and damage to formations and oil wells, etc.

Method used

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  • High-salt reservoir enhanced foam flooding composition and preparation method
  • High-salt reservoir enhanced foam flooding composition and preparation method
  • High-salt reservoir enhanced foam flooding composition and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] a) Add N,N-dimethylhexadecylamine and sodium 3-chloropropyl sulfonate into the reactor at a molar ratio of 1:2, and react at 80°C for 10 hours. After the reaction, wash with absolute ethanol Washing removes unreacted 3-chloropropyl sodium sulfonate, after steaming to remove solvent, obtain cetyl sulfonate betaine, content is 99.0wt%;

[0020] b) Dissolve cetyl sulfonate betaine and sodium cetyl alpha olefin sulfonate prepared in a) in water with a salinity of 100,000 mg / L at a molar ratio of 1:0.5, and the total mass fraction of the foaming agent is 1.0% , mixed uniformly to form a foam agent aqueous solution, and then mixed with the foam flooding gas at a mass ratio of 2:1 to form the required enhanced foam flooding composition.

[0021] Take the above-mentioned foaming agent aqueous solution, and use a foam scanner to conduct a foam stability experiment at 60°C, with an airflow rate of 100mL / min, using a No. 2 sand core, and stop foaming for 30 seconds. Record the tim...

Embodiment 2

[0025] a) Add N,N-dimethyleicosylamine and sodium 2-chloroethylsulfonate into the reaction kettle at a molar ratio of 1:1, and react at 70°C for 10 hours. After the reaction, wash with absolute ethanol Washing removes unreacted sodium 2-chloroethylsulfonate, and after steaming the solvent, obtains eicosylsulfonate betaine, and the content is 98.9wt %;

[0026] b) Dissolve the eicosyl sulfonate betaine and sodium hexadecane sulfonate prepared in a) in water with a salinity of 50,000 mg / L at a molar ratio of 1:0.1, and the total mass fraction of the foaming agent is 1.5% , mixed uniformly to form a foam agent aqueous solution, and then mixed with the foam flooding gas at a mass ratio of 1:1 to form the required enhanced foam flooding composition.

[0027]Take the above-mentioned foaming agent aqueous solution composition and use a foam scanner to conduct a foam stability test at 60°C. The air flow rate is 100mL / min, and the No. 2 sand core is used. The foaming stops for 30 secon...

Embodiment 3

[0031] a) Add N,N-dimethyltetradecylamine and sodium 5-chloropentylsulfonate into the reaction kettle at a molar ratio of 1:3, and react at 90°C for 3 hours. After the reaction, wash with absolute ethanol Washing removes unreacted 5-chloropentyl sodium sulfonate, and after steaming to remove the solvent, tetradecylsulfonate betaine is obtained, and the content is 99.0wt %;

[0032] b) Dissolve the tetradecyl sulfonate betaine and sodium octadecylene sulfonate prepared in a) in water with a salinity of 250,000 mg / L at a molar ratio of 1:0.3, and the total mass fraction of the foaming agent is 0.5% , mixed uniformly to form a foam agent aqueous solution, and then mixed with the foam flooding gas at a mass ratio of 5:1 to form the required enhanced foam flooding composition.

[0033] Take the above-mentioned foaming agent aqueous solution composition and use a foam scanner to conduct a foam stability test at 60°C. The air flow rate is 100mL / min, and the No. 2 sand core is used. T...

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PUM

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Abstract

The invention relates to a reinforced foam flooding composition for high salinity reservoirs, and a preparation method thereof. The problems of bad form stability after meeting a salinity precipitate and poor plugging performance of foaming agents in a high salinity reservoir foam flooding oil extraction process are mainly solved. The foam composition comprises long chain betaine, sodium alpha-olefin sulfonate, mineralized water and a gas, and long chain betaine and sodium alpha-olefin sulfonate are dissolved in the mineralized water, the obtained solution is mixed with the gas to form foams, the long chain betaine is sulfonate, and the molecular general formula of the long chain betaine is shown in the specification. The composition well solves the problems, and can be used in the reinforced foam flooding process of the high salinity reservoirs.

Description

technical field [0001] The invention relates to a high-salt oil reservoir enhanced foam flooding composition and a preparation method thereof. Background technique [0002] The main oilfields in my country have entered a high water cut period after primary and secondary recovery. How to improve oil recovery and maximize the development of remaining reserves, tertiary oil recovery technology has played a very important role in ensuring stable and high production of oil fields. Among new technologies for tertiary oil recovery, chemical composite flooding is still one of the most promising methods. The oil displacement mechanism is mainly that the polymer or glue increases the viscosity of the displacement water, reduces the oil-water mobility ratio, alleviates the channeling phenomenon, and improves the sweep efficiency; surfactants and alkalis reduce the oil / water interfacial tension, increase the capillary number, and promote Crude oil is desorbed and effectively dispersed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/594C09K8/584
CPCC09K8/584C09K8/594
Inventor 何秀娟高磊裘鋆李应成沈之芹
Owner CHINA PETROLEUM & CHEM CORP
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