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Foaming agent for CO2 oil displacement system and preparation method thereof

A technology of foaming agent and system, which is applied in the field of foaming agent and its preparation in CO2 flooding system, and can solve the problems of unstable foam, unsatisfactory, and incapable of large-dose use

Active Publication Date: 2017-05-10
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lignosulfonate, α-olefin sulfonate, fatty alcohol polyoxyethylene sulfate, α-olefin sulfonate and other foaming agents are more common, but under the conditions of high temperature and high salt, the foam is unstable and the foaming The amount is small, and it cannot be used in large doses, which cannot meet the requirements of CO production in oilfields. 2 foam demand

Method used

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  • Foaming agent for CO2 oil displacement system and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] one for CO 2 The foaming agent of the oil displacement system is composed of the following components by weight: dodecyl hydroxypropyl phosphate betaine 0.2g, surfactant C with star molecular structure 12 h 25 N[CH 2 CH 2 CONHCH 2 CH 2 NH(CH 2 CH 2 CONHCH 2 CH 2 NH 2 ) 2 ] 2 0.1 g, 100 g of water.

[0032] Wherein, the surfactant with star-shaped molecular structure is prepared by the following method:

[0033] (1) Add 14.24 mmol of dodecylamine C 12 h 25 NH 2 Dissolve in 30mL of methanol to form a methanol solution of dodecylamine, add 0.24mol of methyl acrylate dropwise to the methanol solution of dodecylamine, stir at room temperature for 24h, and then rotate at 60°C for 1.5 h, get C 12 h 25 N(CH 2 CH 2 COOCH 3 ) 2 , is light yellow viscous liquid;

[0034] (2) Weigh 7.12mmol of product C from step (1) 12 h 25 N(CH 2 CH 2 COOCH 3 ) 2 , dissolved in 15mL of methanol, under ice bath, dropwise added 0.30mol ethylenediamine, after the dropwis...

Embodiment 2

[0039] one for CO 2 The foaming agent of the oil displacement system is composed of the following components by weight: dodecyl hydroxypropyl phosphate betaine 0.05g, surfactant C with star molecular structure 12 h 25 N[CH 2 CH 2 CONHCH 2 CH 2 NH(CH 2 CH 2 CONHCH 2 CH 2 NH 2 ) 2 ] 2 0.05 g, water 95 g.

[0040] Wherein, the surfactant with star-shaped molecular structure is prepared by the following method:

[0041] (1) Add 16mmol of dodecylamine C 12 h 25 NH 2 Dissolve in 35mL of methanol to form a methanol solution of dodecylamine, add 0.24mol of methyl acrylate dropwise to the methanol solution of dodecylamine, stir at room temperature for 24h, and then at 60°C, rotary evaporate for 0.5 h, get C 12 h 25 N(CH 2 CH 2 COOCH 3 ) 2 , is light yellow viscous liquid;

[0042] (2) Weigh 7.5mmol of product C from step (1) 12 h 25 N(CH 2 CH 2 COOCH 3 ) 2 , dissolved in 20mL of methanol, under an ice bath, dropwise added 0.30mol ethylenediamine, after the ...

Embodiment 3

[0047] one for CO 2 The foaming agent of the oil displacement system is composed of the following components by weight: 0.4 g of dodecyl hydroxypropyl phosphate betaine, surfactant C with star molecular structure 18 h 37 N[CH 2 CH 2 CONHCH 2 CH 2 NH(CH 2 CH 2 CONHCH 2 CH 2 NH 2 ) 2 ] 2 0.5 g, water 100 g.

[0048] Wherein, the surfactant with star-shaped molecular structure is prepared by the following method:

[0049] (1) 13.33 mmol of octadecylamine C 18 h 37 NH 2 Dissolve in 30mL of methanol to form a methanol solution of octadecylamine, weigh 0.24mol of methyl acrylate and add it dropwise to the methanol solution of octadecylamine, stir at room temperature for 24h, and then rotary evaporate at 60°C for 3h , get C 18 h 37 N (CH 2 CH 2 COOCH 3 ) 2 , is light yellow viscous liquid;

[0050] (2) Weigh 6.82mmol of product C from step (1) 18 h 37 N (CH 2 CH 2 COOCH 3 ) 2 , dissolved in 15mL of methanol, under ice bath, dropwise added 0.30mol ethylene...

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Abstract

The invention discloses a foaming agent for a CO2 oil displacement system and a preparation method thereof. The foaming agent is prepared from the following ingredients in parts by weight: 0.05 to 0.4 part of dodecyl hydroxypropyl phosphate betaine, 0.05 to 0.5 part of surface active agents with star-shaped molecular structures and 95 to 100 parts of water, wherein the surface active agent is any one of R2N[R1N(R1NH2)2]2, R3[N(R1NH2)2]2 and N[CH2CH2N(R1NH2)2]3; the R1 is -CH2CH2CONHCH2CH2-; the R2 is CnH2n+1-, and the n is 12 to 18; the R3 is -CnH2n-, and the n is 4 to 8; the surface active agents are prepared by enabling primary amine, diamine or triamine to react with methyl acrylate and ethylenediamine. The foaming agent provided by the invention has high foaming capability, and the formed foam has high stability.

Description

technical field [0001] The invention belongs to the field of petrochemicals, in particular to a 2 A foaming agent for an oil displacement system and a preparation method thereof. Background technique [0002] In the process of oil field development and natural gas field development, foam flooding is widely used, such as foam drilling fluid, foam fracturing fluid, foam flooding, foam sealing and so on. Foam is a dispersion system formed by gas in liquid phase under the action of foaming agent. According to the different gases used, it can be divided into air foam, nitrogen foam, natural gas foam, CO 2 foam etc. With the world's interest in CO this year 2 Emphasis on emission reduction, more and more CO 2 Injected into the ground, it can enhance oil recovery while reducing emissions. The problem caused by gas injection is gas channeling. Practices at home and abroad have proved that foam is one of the effective methods to delay gas channeling. Therefore, a lot of researc...

Claims

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Application Information

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IPC IPC(8): C09K8/584C09K8/594
CPCC09K8/584C09K8/594
Inventor 余华贵王贺谊吴丽王蓓蕾李剑汤瑞佳王维波尚庆华陈龙龙郭茂雷聂向荣王伟
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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