Method for improving petroleum recovery efficiency through air foam flooding assisted by microorganisms

A technology of air foam flooding and air foam, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of oil well shutdown and affect normal production, etc., and achieve the effect of improving properties and oil recovery

Inactive Publication Date: 2015-08-12
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will cause oil wells to s...

Method used

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  • Method for improving petroleum recovery efficiency through air foam flooding assisted by microorganisms
  • Method for improving petroleum recovery efficiency through air foam flooding assisted by microorganisms
  • Method for improving petroleum recovery efficiency through air foam flooding assisted by microorganisms

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Composition of microbial-assisted air foam system: microbial nutrient, fermentation broth, and air foam system.

[0034] 1. The microbial nutrient composition is calculated by weight percentage (the same below): diammonium hydrogen phosphate (industrial product), 0.2%; sodium nitrate (industrial product) 0.1%; yeast powder (industrial product) 0.05%, corn steep liquor dry powder (industrial product) product) 0.2%; the rest is water.

[0035] 2. Microbial fermentation liquid: aerobic bacteria (mainly hydrocarbon oxidizing bacteria) fermentation liquid with a mass ratio of 5%, and the concentration of bacteria in the fermentation liquid is 3 × 10 8 pieces / ml.

[0036] 3. Air foam system composition: air; foaming agent (industrial product) 0.3%, and the rest is water.

[0037] 2. Experimental method

[0038] The experimental water and microbial fermented bacteria liquid are prepared into a solution, and then the microbial nutrient and foaming agent are sequentially a...

Embodiment 2

[0048]1. Composition of microbial-assisted air foam system: microbial nutrient, fermentation broth, and air foam system.

[0049] 1. Composition of microbial nutrient: diammonium hydrogen phosphate (industrial product), 0.4%; sodium nitrate (industrial product) 0.3%; yeast powder (industrial product) 0.1%, corn steep liquor dry powder (industrial product) 0.4%, and the rest is water .

[0050] 2. Microbial fermentation liquid: aerobic bacteria (mainly hydrocarbon oxidizing bacteria), the concentration of the fermentation liquid is 5×10 8 pieces / ml.

[0051] 3. Composition of air foam system: air; foaming agent (industrial product) 0.5%, and the rest is water.

[0052] 2. Experimental method

[0053] The experimental method is the same as the experimental method and materials in Example 1.

[0054] 3. Experimental results

[0055] The half-life of the air foam is 117 minutes, and the foaming rate is 446%. The oxygen content in the gas produced at the outlet of the core is...

Embodiment 3

[0060] This example is to test the influence of air foam flooding and microbe-assisted air foam flooding on oil displacement efficiency and the change of displacement pressure (that is, the plugging ability of air foam to core macropores).

[0061] 1. Composition of microbial-assisted air foam system: microbial nutrient, fermentation broth, and air foam system.

[0062] 1. Composition of microbial nutrient: diammonium hydrogen phosphate (industrial product), 0.3%; sodium nitrate (industrial product) 0.2%; yeast powder (industrial product) 0.07%, corn steep liquor dry powder (industrial product) 0.3%, and the rest is water .

[0063] 2. Microbial fermentation liquid: aerobic bacteria (mainly hydrocarbon oxidizing bacteria), the concentration of the fermentation liquid is 5×10 8 pieces / ml.

[0064] 3. Air foam system composition: air; foaming agent (industrial product) 0.4%, and the rest is water.

[0065] 2. Experimental method

[0066] The oil-removed and dried oil reservo...

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Abstract

A method for improving petroleum recovery efficiency through air foam flooding assisted by microorganisms comprises the steps of composition of a microorganism-assisted air foam system and injection of the microorganism-assisted air foam system, wherein the microorganism-assisted air foam system is composed of microorganism nutrients, microorganism fermentation liquor and an air foam system; according to the step of injection of the microorganism-assisted air foam system, before construction, the oxygen-consuming microorganism fermentation liquor is injected into an immediate vicinity of wellbore of an injection well, and the concentration of native aerobic bacteria in crude oil of the immediate vicinity of wellbore of the injection well is improved; then the air foam system with the microorganism nutrients is injected into an oil layer, microorganisms quickly ferment through the nutrients and air so as to consume oxygen in air, and the content of oxygen is reduced to be smaller than a safety value. By means of the method for improving recovery efficiency through air foam flooding assisted by microorganisms, the content of oxygen in air of the injection well can be lowered to be lower than 3%, and oxygen detected in an oil well is nearly zero; meanwhile, microbial metabolism surface active agents improve the performance of air foam and the crude oil recovery efficiency to some extent.

Description

technical field [0001] The invention relates to a method for increasing oil recovery by air foam flooding, in particular to using microorganisms to rapidly consume oxygen in the air and reduce safety risks due to the presence of oxygen. Background technique [0002] The air foam flooding method is to utilize the foaming properties of surfactants to prepare oil displacement agents for oil recovery (Wu Xinrong et al. "Air Foam Control and Flooding Enhanced Oil Recovery Technology"). Air foam flooding enhanced oil recovery technology has the common characteristics of air flooding and foam flooding. One is that the source of air is wide, and it is not limited by space and region; the other is that the cost is low and it is applicable to a wide range of reservoir types. This technology can not only increase the swept volume of the injection fluid but also improve the oil displacement efficiency, and is one of the effective technologies for enhancing the recovery of heterogeneous...

Claims

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Application Information

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IPC IPC(8): E21B43/22
Inventor 马挺李国强
Owner NANKAI UNIV
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