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Green and environmentally friendly foam oil displacement system based on alkyl glycoside and preparation method and application thereof

A technology of alkyl glycoside and foam flooding, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem that the performance of the foam flooding system cannot meet the needs of the technology well, and the interfacial tension of oil and water cannot reach ultra-low , Surfactant is not enough safety and environmental protection and other issues, to achieve the effects of obvious plugging effect, good dynamic stability, ultra-low oil-water interfacial tension

Active Publication Date: 2017-01-11
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] According to the existing research results, excellent foam stability, ultra-low oil-water interfacial tension, and suitable oil resistance are all very important to ensure the good effect of foam flooding to enhance oil recovery, but it is very difficult to design a system that has these characteristics at the same time
Most of the existing foam flooding agents focus on profile control performance, and the oil-water interfacial tension cannot reach ultra-low; some foam flooding systems can reduce the oil-water interfacial tension to ultra-low, but the oil resistance of the formed foam is not good
In addition, most of the surfactants used in the existing foam flooding systems are not safe and environmentally friendly, and may cause certain harm to the environment
Due to the above reasons, the performance of the existing foam flooding system cannot well meet the needs of the technology, which constitutes the bottleneck of the promotion of this technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Preparation of a green and environment-friendly foam flooding system based on alkyl glycosides, wherein the mass concentration of alkyl glycosides is 0.05%, the mass concentration of cationic surfactants is 0.0375%, and the mass concentration of anionic surfactants is 0.0125% (mass concentration of cationic surfactant: mass concentration of anionic surfactant=3:1), described cationic surfactant is dodecyltrimethylammonium bromide, and described anionic surfactant is dodecyl trimethylammonium bromide Sodium Alkyl Sulfate.

[0032] In the salinity range of 0-32000ppm, the effect of salinity on the foam stability of the foam flooding system was explored.

[0033] Take 50ml of the aqueous solution of the above-mentioned foam flooding system, the salinity is 0ppm, 10000ppm, 17000ppm, 32000ppm respectively, pour it into the airflow foam instrument, and keep the temperature at 50°C; 2 , the gas flow rate is 100ml / min, foaming to 200ml, test its static stability. W...

Embodiment 2

[0034] Example 2: Preparation of a green and environment-friendly foam flooding system based on alkyl glycosides, wherein the mass concentration of alkyl glycosides is 0.06%, the mass concentration of cationic surfactants is 0.03%, and the mass concentration of anionic surfactants is 0.01% (mass concentration of cationic surfactant: mass concentration of anionic surfactant=3:1), described cationic surfactant is cetyltrimethylammonium bromide, and described anionic surfactant is dodecyl trimethylammonium bromide Sodium alkylbenzene sulfonate, the salinity is 17000ppm.

[0035] Take 50ml of the aqueous solution of the above-mentioned green and environmentally friendly oil displacing agent mainly based on alkyl glycosides and pour it into the air-flow method foam instrument at a constant temperature of 50°C; 2 , the gas flow rate is 100ml / min, foam to 200ml, test its half-life. The foam half-life of the foam flooding system is 340 minutes, and the oil-water interfacial tension w...

Embodiment 3

[0036] Example 3: Preparation of a green and environment-friendly foam flooding system based on alkyl glycosides, wherein the mass concentration of alkyl glycosides is 0.05%, the mass concentration of cationic surfactants is 0.0375%, and the mass concentration of anionic surfactants is 0.0125% (mass concentration of cationic surfactant: mass concentration of anionic surfactant=3:1), described cationic surfactant is cetyltrimethylammonium bromide, and described anionic surfactant is fatty alcohol Sodium polyoxyethylene ether sulfate, the salinity range is 0-32000ppm.

[0037] The dynamic stability of the foam was measured by means of an external rotor disturbance. Bubble N through the porous sand core at the bottom of the foam tube at a rate of 100ml / min 2 In-situ foaming, the initial liquid volume and the maximum volume of the foam are 30ml and 180ml respectively, the outer cover of the foam tube is connected to the water bath, the temperature is 50°C, the dynamic stability o...

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Abstract

The invention relates to a green and environmentally friendly foam oil displacement system based on alkyl glycoside and a preparation method and application thereof and belongs to the field of chemical oil displacement for improving oil field crude oil recovery rate. The foam oil displacement system is obtained by using the alkyl glycoside as a main surfactant and compounding the surfactant with an anionic surfactant and a cationic surfactant. The alkyl glycoside surfactant adopted by the oil displacement system is from a natural source, is green and environmentally friendly, the average polymerization degree of sugar moieties is 1.0-3.0, and hydrophobic carbon chain length is 8-12. Other surfactants are industrialized produced fine chemicals, raw materials are easy to obtain, and preparation is simple. The foam oil displacement system has the properties of good temperature resistance and oil resistance, good dynamic foam stability, strong plugging effect, good salt resistance, ultralow interfacial tension and the like, has good compatibility with other oil-displacing agents, the effect of improving crude oil recovery rate is obvious, and the recovery rate of an indoor physical model oil displacement test can be improved by about 20%-26% OOIP.

Description

technical field [0001] The invention relates to a water-based foam system with green and environment-friendly surfactant alkyl glycoside as the main agent and its application in tertiary oil recovery, which belongs to the field of oil field chemistry. Background technique [0002] The petroleum industry is an important pillar of the national economy and the economic lifeline of the country's development. At present, most oilfields in my country have entered the high water-cut development period or even the ultra-high water-cut stage. The primary and secondary oil recovery can no longer meet the needs of the society, and the tertiary oil recovery technology has developed rapidly. Tertiary oil recovery mainly includes four technical series, namely chemical flooding, gas flooding, thermal flooding and microbial flooding. Among them, the development of chemical flooding technology is relatively mature, and its application in major oil fields is becoming more and more extensive....

Claims

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Application Information

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IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 李英亓晓庆
Owner SHANDONG UNIV
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