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CO2-soluble foaming agent and its preparation method

A foam agent and foam technology, applied in the field of CO2-soluble foam agent and its preparation, can solve problems such as difficult injection and corrosion of wellbore, achieve good solubility and foam stability, and improve injectability

Active Publication Date: 2015-01-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is in order to overcome that existing water-soluble foam agent is difficult to inject low-permeability reservoir, CO 2 Corrosion wellbore and other defects, providing a CO soluble 2 Foaming agent and preparation method thereof

Method used

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  • CO2-soluble foaming agent and its preparation method
  • CO2-soluble foaming agent and its preparation method

Examples

Experimental program
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Embodiment 1

[0026] Mix 3g of octylphenol polyoxyethylene ether with a degree of polymerization of 5 to 15 and 12g of amyl alcohol and add it to a high-temperature and high-pressure visual foam instrument. Heat the foam instrument to 80°C, stir it evenly, and gradually fill it with CO 2 , and stirred at a speed of 200r / min until all octylphenol ethoxylates and amyl alcohol were dissolved in CO 2 , record that the pressure inside the foam instrument is 10.3MPa at this time, and calculate the added CO 2 The mass is 305.91g, so it is calculated that octylphenol polyoxyethylene ether in CO 2 The solubility in is 0.94%, which shows that the prepared foam has good solubility.

[0027] Prepared CO soluble 2 After the foaming agent is injected into the oil reservoir, it will generate foam when it encounters formation water to realize the plugging effect. With 30.6g NaCl, 0.62g MgSO 4 and 0.45g CaCl 2 Prepare 200ml of simulated high-salinity formation water with a salinity of 150,000mg / L; take...

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Abstract

The invention belongs to the technical field of oilfield chemicals, relates to a chemical additive used in the oilfields to improve the oil production efficiency, and concretely relates to a CO2-soluble foaming agent and its preparation method. The CO2-soluble foaming agent is prepared by mixing 0.1-6mass% of an alkylphenol ethoxylate foaming agent with 0.5-10mass% of an alcohol solubilizer and 85-99mass% of CO2. The foaming agent provided by the invention can be dissolved in CO2 and meets water in oil reservoirs to form foams, so the injectability of the foaming agent is improved, and the problem of corrosion of CO2 meeting water to injection wellbores is avoided; and the foaming agent has excellent dissolvability, temperature and salt resistance and foam stabilizing performance.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemicals, and relates to a chemical additive used in oilfields to improve oil recovery efficiency, in particular to a CO soluble 2 Foaming agent and preparation method thereof. Background technique [0002] CO in recent years 2 The emission problem of CO has attracted more and more attention. 2 The utilization of resources is one of the focuses of the research. With CO 2 With the popularization and application of capture and geological storage technology, the problem of gas source has been solved, and more and more oil reservoirs will become CO 2 drive target. For medium-high permeability and low permeability reservoirs, due to formation heterogeneity and CO 2 Mobility is much higher than crude oil and will result in gas channeling and viscous fingering. CO 2 It tends to seepage in formations with high permeability and high water saturation, coupled with gravity differentiation caused by...

Claims

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Application Information

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IPC IPC(8): C09K8/594
CPCC09K8/594
Inventor 牛保伦邓瑞健林伟民吴信荣杨昌华赵斌周迅苗宏
Owner CHINA PETROLEUM & CHEM CORP
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