Foaming agent for forming CO2 foams and preparation method thereof

A foaming agent and foaming technology, applied in the chemical field, can solve the problems of not being able to use large doses, harsh use conditions, and low foaming volume, etc.

Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 research and practice have been carried out at home and abroad, especially in the United States and Canada, such as lignin introduced in USP4086964 Sulfonate, α-olefin sulfonate introduced in USP4393937, fatty alcohol polyoxyethylene sulfate introduced in USP4113011, Lathanol LAL70 from Stepan Chemical Co., CD1045 from Chevrn, etc. The foaming amount of α-olefin sulfonate is not very high , Fatty alcohol polyoxyethylene sulfate, Lathanol LAL70, CD1045 are sensitive to calcium and magnesium ions, and cannot be used in large doses
[0003] Due to CO 2 It is an acidic gas, so higher requirements are put forward for the foaming agent, and the CO used in the oil field 2 Foaming agents require large quantities, moderate prices, reliable performance, and harsh operating conditions. Most of them are used under high-temperature and high-salt conditions. Therefore, the products currently on the market cannot meet the needs of oilfields to generate CO2. 2 foam demand

Method used

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  • Foaming agent for forming CO2 foams and preparation method thereof
  • Foaming agent for forming CO2 foams and preparation method thereof
  • Foaming agent for forming CO2 foams and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This example is used for the preparation and performance evaluation of foaming agent

[0026] Accurately weigh 100 parts by weight of alkyl hydroxypropyl phosphate betaine (n=14), 5 parts by weight of alkyl phosphate (n=4, m=8), fatty alcohol polyoxyethylene ether sodium sulfate (n= 12, m=3) 8 parts by weight, 7 parts by weight lauryl imidazoline betaine, dissolved in 120 parts by weight simulated brine (NaCl 1%, CaCl 2 0.02%), use a glass rod to slowly stir and dissolve to avoid foam formation, that is, a foaming agent system is obtained. Use simulated brine (NaCl 1%, CaCl 2 0.02%) was formulated into a foaming liquid of 3000mg / L and 5000mg / L. The foaming volume was 620mL and 640mL, and the half-life was 20min and 22min, respectively, measured by the Roche foam meter at 80℃.

Embodiment 2

[0028] This example is used for the preparation and performance evaluation of foaming agent

[0029] Accurately weigh 100 parts by weight of alkyl hydroxypropyl phosphate betaine (n=14), 3.5 parts by weight of alkyl phosphate (n=4, m=8), fatty alcohol polyoxyethylene ether sodium sulfate (n= 12, m=3) 1 part by weight, 8 parts by weight lauryl imidazoline betaine, dissolved in 60 parts by weight simulated brine (NaCl 1%, CaCl 2 0.02%), use a glass rod to slowly stir and dissolve to avoid foam formation, that is, a foaming agent system is obtained. Use simulated brine (NaCl 1%, CaCl 2 0.02%) formulated into 2000mg / L, 3000mg / L foaming liquid. The foaming volume was 640mL and 650mL, and the half-life was 19min and 24min, respectively, measured by the Roche foam meter at 80℃.

Embodiment 3

[0031] This example is used for the preparation and performance evaluation of foaming agent

[0032] Accurately weigh 100 parts by weight of alkyl hydroxypropyl phosphate betaine (n=14), 10 parts by weight of alkyl phosphate (n=4, m=8), fatty alcohol polyoxyethylene ether sodium sulfate (n= 12, m=3) 1 part by weight, 4 parts by weight lauryl imidazoline betaine, dissolved in 90 parts by weight simulated brine (NaCl 1%, CaCl 2 0.02%), slowly added to the beaker, slowly stirred with a glass rod to dissolve, to avoid the formation of foam, that is, a foaming agent system. Use simulated brine (NaCl 1%, CaCl 2 0.02%) was formulated into 2000mg / L, 5000mg / L foaming liquid. The foaming volume measured by Roche foam meter at 80°C was 600 mL and 620 mL, and the half-life was 28 min and 23 min respectively.

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PUM

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Abstract

The invention discloses a foaming agent for forming CO2 foams and a preparation method thereof. The foaming agent contains alkylhydroxypropyl phosphobetaine as the basic component. In terms of 100 parts, the rest components are 3-20 parts of alkyl phosphate, 1-5 parts of fatty alcohol polyoxyethylene ether sodium sulfate, 3-15 parts of lauryl imidazoline betaine, and 20-120 parts of water. The foaming agent for forming CO2 foams disclosed in the invention can form stable CO2 foams, thus meeting the needs of oilfield development.

Description

Technical field [0001] The present invention relates to the field of chemistry, and further to a method for forming CO 2 Foaming agent and preparation method. Background technique [0002] Foam is widely used in oilfield development, such as foam drilling fluid, foam fracturing fluid, foam flooding, foam channeling, etc. From the difference of the gas used, it can be divided into air foam, nitrogen foam, natural gas foam, CO 2 Bubbles etc. With this year’s 2 The emphasis on emission reduction, more and more CO 2 It is injected into the ground to increase 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 research and practice have been carried out at home and abroad, especially in the United States and Canada, such as the lignin introduced in USP4086964 Sulfonate, α-olefin sulfonate introduced in USP4393937, f...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/38C09K8/94C09K8/584
Inventor 马涛王海波谭中良
Owner CHINA PETROLEUM & CHEM CORP
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