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Foaming agent used in composite-foam oil flooding

A composite foam and foaming agent technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as the limitation of air flooding efficiency

Active Publication Date: 2012-04-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The source of air is wide and the cost is cheap. It can be used not only as a secondary oil recovery method, but also for tertiary oil recovery. oil displacement efficiency is limited

Method used

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  • Foaming agent used in composite-foam oil flooding

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The present invention is realized in the following ways,

[0027] 1. Mix 0.2% hydroxysultaine and 0.05% lauryl alcohol in proportion, add into formation water during the stirring process, until completely dissolved, and make base liquid.

[0028] 2. While stirring, add 0.1% 1227 to the base liquid to form a foaming agent solution.

[0029] The performance of the foaming agent solution was tested, and the temperature resistance can be stabilized at 50°C; the salt resistance is good, reaching 80×10 3 mg / L; use the Ross-mils method (pouring method) to measure the foaming performance and foam stabilizing performance of the foaming agent. The measured foaming height is 14.4cm, and the half-life reaches 16 hours; the oil-water interfacial tension is 0.194mN / m.

Embodiment 2

[0031] The present invention is realized in the following ways,

[0032] 1. Mix 0.4% hydroxysultaine and 0.1% lauryl alcohol in proportion, add into formation water during stirring, until completely dissolved, and make base liquid.

[0033] 2. While stirring, add 0.1% 1227 to the base liquid to form a foaming agent solution.

[0034] The performance of the foaming agent solution was tested, and the temperature resistance can be stabilized at 50°C; the salt resistance is good, reaching 80×10 3 mg / L; use the Ross-mils method (pouring method) to measure the foaming performance and foam stabilizing performance of the foaming agent. The measured foaming height is 14.4cm, and the half-life reaches 16 hours; the oil-water interfacial tension is 0.194mN / m.

Embodiment 3

[0036] The present invention is realized in the following ways,

[0037] 1. Mix 0.3% hydroxysultaine and 0.07% dodecanol in proportion, add into formation water during stirring, until completely dissolved, and make base liquid.

[0038] 2. While stirring, add 0.1% 1227 to the base liquid to form a foaming agent solution.

[0039] The performance of the foaming agent solution was tested, and the temperature resistance can be stabilized at 50°C; the salt resistance is good, reaching 80×10 3 mg / L; use the Ross-mils method (pouring method) to measure the foaming performance and foam stabilizing performance of the foaming agent. The foaming height measured is 14.4cm, and the half-life reaches 16 hours; the oil-water interfacial tension is 0.194mN / m.

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Abstract

The invention relates to a foaming agent used in composite-foam oil flooding. The foaming agent comprises materials of, by concentration: 0.2 to 0.4% of hydroxyl-sulfobetaine, 0.1% of 1227, 0.04 to 0.1% of dodecanol, and balance of formation water. The molecular formula of 1227 is C21H38NCl. The molecular formula of dodecanol is C12H26O. The foaming agent provided by the invention has a temperature resistance stabilized at 50 DEG C, and a good salt resistance of 80*10<3>mg / L. Foaming performance and foam stabilizing performance of the foaming agent are detected by using a Ross-mils method (a decanting method). The foaming height of the foaming agent is 14.4cm; the half-life period reaches 16 hours; and the oil-water interfacial tension is 0.192mN / m. According to the invention, advantages of chemical flooding and gas flooding are combined; viscose foam and gas are adopted as oil-flooding agents, such that double functions of profile modifying and oil flooding are achieved, and a defectof gas flooding of gas channeling is avoided. The foaming agent is suitable for oil reservoir with high water content, severe anisotropic, and cracks or large porous channels.

Description

technical field [0001] The invention relates to a foaming agent for composite foam oil displacement, which is a chemical oil displacement agent suitable for oil displacement and production increase in low-permeability heterogeneous oilfields. Background technique [0002] Most of the oilfields discovered in my country belong to continental sedimentary reservoirs with serious heterogeneity. Affected by formation heterogeneity and unfavorable water-oil mobility ratio, the water cut rises rapidly and the water flooding recovery rate is low , the water flooding effect is often not ideal. However, the choices of other effective technologies for enhancing oil recovery are limited, such as modified water injection and polymer injection technologies. Gas injection has been proven to be an efficient EOR technology, but its application is limited due to insufficient gas sources and high costs. Therefore, more and more attention has been paid to the air injection technology, and the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/594
Inventor 郑力军李宪文杨立华李永长黎哓茸张涛
Owner PETROCHINA CO LTD
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