Foam sealing composition and its preparation method and use

A technology of composition and foam, which is applied in the direction of drilling composition, chemical instruments and methods, earthwork drilling and mining, etc., can solve the problems of poor plugging effect and gas channeling, and achieve the purpose of inhibiting gas channeling, reducing surface tension, improving The effect of recovery factor

Active Publication Date: 2016-06-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] One of the technical problems to be solved by the present invention is the problem of gas channeling caused by the poor plugging effect existing in the existing gas flooding oil production process, and a new foam channeling sealing composition is provided

Method used

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  • Foam sealing composition and its preparation method and use
  • Foam sealing composition and its preparation method and use
  • Foam sealing composition and its preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 90g of dodecylamine and 0.3% potassium hydroxide of amine weight to the reaction kettle, add 450g of ethylene oxide, and react at 200°C for 1 hour; then add 60g of sodium chloroacetate, continue to react at 50°C for 20 hours, and finally add hydrochloric acid Neutralize to pH<3, stand to separate layers, add 30% by weight NaOH aqueous solution to the oil phase for neutralization, and obtain anion-nonionic foaming agent.

[0027] Lauryl ammonium chloride and the anion-nonionic foam agent prepared by the present invention were respectively dissolved in water, stirred for 30 minutes, and mixed with a 0.5% weight aqueous solution, and then the above-mentioned foam agent was mixed according to cation: anion-nonionic foam agent mole Mix evenly at a ratio of 1:8 to obtain foam composition 1, the composition and structure of which are shown in Table 1.

[0028] The above composition is mixed with the gas for gas driving to form the required foam blocking composition.

Embodiment 2

[0030] Add 140g eicosylamine and potassium hydroxide with 1% weight of amine into the reaction kettle, add 180g ethylene oxide and 67g propylene oxide, and react at 200°C for 10 hours; then add 90g sodium chloroacetate, and continue the reaction at 80°C for 8 hours, finally add hydrochloric acid to neutralize to pH<3, let stand to separate layers, and add 30% by weight NaOH aqueous solution to the oil phase to neutralize to obtain anion-nonionic foaming agent.

[0031] Octadecyl ammonium bromide and the anion-nonionic foam agent prepared by the present invention were respectively dissolved in water, stirred for 30 minutes, and mixed with a 0.5% weight aqueous solution, and then the above-mentioned foam agent was mixed according to the cation: anion-nonionic foam agent mole Mix evenly at a ratio of 1:10 to obtain foam composition 2, the composition and structure of which are shown in Table 1.

[0032] The above composition is mixed with the gas for gas driving to form the requi...

Embodiment 3

[0034]75g of decylamine and potassium hydroxide of 3% by weight of the amine were added to the reactor, 315g of ethylene oxide and 151g of propylene oxide were added, and reacted at 150°C for 3 hours; then 195g of Br(CH 2 ) 5 COOH, continue to react at 100°C for 1 hour, finally add hydrochloric acid to neutralize to pH3 ) 2 The aqueous solution is neutralized to obtain an anionic-nonionic foam.

[0035] Myristyl ammonium chloride and the anion-nonionic foam agent prepared by the present invention were dissolved in water respectively, stirred for 30 minutes, and mixed with a 0.5% weight aqueous solution, and then the above-mentioned foam agent was mixed according to cation: anion-nonionic foam agent mole Mix evenly at a ratio of 1:1.4 to obtain foam composition 3, the composition and structure of which are shown in Table 1.

[0036] The above composition is mixed with the gas for gas driving to form the required foam sealing system.

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Abstract

The invention relates to a foam sealing channeling composition, a preparation method thereof and applications thereof, mainly solving a gas channeling problem in gas-drive oil recovery processes at present. According to the technical scheme, the foam sealing channeling composition, the preparation method thereof and the applications thereof are adopted, wherein the foam sealing channeling composition comprises a cationic foaming agent, an anion-nonionic foaming agent and gas; the cationic foaming agent, the anion-nonionic foaming agent and the gas are mixed to form foams; the cationic foaming agent is any one of a quaternary ammonium salt and a quaternary amine alkali; the anion-nonionic foaming agent is any one of fatty alcohol polyoxyethylene / polypropylene ether carboxylate or fatty alcohol polyoxyethylene ether / polypropylene ether sulfonate; the gas is any one that has an inert relationship with the foaming agents; the molar ratio of the cationic foaming agent to the anion-nonionic foaming agent is 1:0.01-100; and the volume ratio of the gas to the liquid is 0.1-10:1. By the technical scheme, the problem is solved well and the foam sealing channeling composition can be used in enhanced oil recovery processes of an oil field.

Description

technical field [0001] The invention relates to a foam sealing composition and its preparation method and application. Background technique [0002] my country's main oilfields have entered a period of high water cut after primary and secondary exploitation. How to improve crude oil recovery and maximize the remaining reserves has become an important task for the petroleum industry. Gas flooding is one of the most effective methods for enhancing oil recovery in complex reservoirs, especially difficult reservoirs. However, in the process of gas displacement, there are serious technical problems, that is, due to the large viscosity contrast between underground crude oil and injected gas, which leads to an unfavorable mobility ratio, which leads to early gas breakthrough and reduces the sweep coefficient of the oil layer; The heterogeneity of the reservoir, especially when there are fractures or large pores, will cause serious gas channeling and reduce oil production. [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/42E21B43/22
CPCC09K8/493C09K8/594
Inventor 何秀娟高磊沙鸥吴国英
Owner CHINA PETROLEUM & CHEM CORP
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