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Method of enhancing oil recovery by air-microbial composite flooding in low permeability reservoirs

A technology of air microorganisms and microorganisms, applied in the direction of biochemical equipment and methods, microorganisms, microorganisms, etc., can solve problems affecting normal production, oil well shutdown, etc.

Active Publication Date: 2018-04-06
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This will cause oil wells to shut down and affect normal production

Method used

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  • Method of enhancing oil recovery by air-microbial composite flooding in low permeability reservoirs
  • Method of enhancing oil recovery by air-microbial composite flooding in low permeability reservoirs
  • Method of enhancing oil recovery by air-microbial composite flooding in low permeability reservoirs

Examples

Experimental program
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Effect test

Embodiment 1

[0032] One, microbial nutrient solution, composition counts by weight percentage: diammonium hydrogen phosphate (industrial product), 0.3%; Yeast powder (industrial product) 0.05%, icing sugar (industrial product) 0.3%, all the other are water.

[0033] 2. The oil well output fluid is deoiled, and the microorganisms in it are used to make the concentration 1×10 7 individual / mL.

[0034] 3. Air.

[0035] 2. Experimental method

[0036] 1. Add the above-mentioned nutrient solution to the production solution to prepare the nutrient solution, and mix it with air during the experiment to investigate the oxygen content of the air injected into the core at the output end under the action of microorganisms.

[0037] 2. Inject air and nutrient solution into the artificial core (40°C) in the form of a slug of 1.5:1, with an injection volume of 0.5 PV (pore volume). After 5 days of storage, water flooding is resumed, and gas is collected at the outlet of the core for gas phase Chromat...

Embodiment 2

[0044] One, microbial nutrient solution, composition counts by weight percentage: diammonium hydrogen phosphate (industrial product), 0.5%; Yeast powder (industrial product) 0.1%, icing sugar (industrial product) 0.5%, all the other are water.

[0045] 2. The oil well output fluid is deoiled, and the microorganisms in it are used to make the concentration 1×10 7 individual / mL.

[0046]3. Air.

[0047] 2. Experimental method

[0048] 1. The nutrient solution is added to the output solution to prepare the nutrient solution, which can be mixed with air during the experiment to investigate the oxygen content of the air injected into the core at the output end under the action of microorganisms.

[0049] 2. Inject air and nutrient solution into the artificial core (40°C) in the form of a slug of 1.5:1, with an injection volume of 0.5 PV (pore volume). After 5 days of storage, water flooding is resumed, and gas is collected at the outlet of the core for gas phase Chromatographic ...

Embodiment 3

[0056] One, microbial nutrient solution, composition counts by weight percentage: diammonium hydrogen phosphate (industrial product), 0.5%; Yeast powder (industrial product) 0.1%, icing sugar (industrial product) 0.5%, all the other are water.

[0057] 2. The oil well output fluid is deoiled, and the microorganisms in it are used to make the concentration 1×10 7 individual / mL.

[0058] 3. Air.

[0059] 2. Experimental method

[0060] 1. Add the nutrient solution to the output solution to prepare the nutrient solution, add crude oil to the nutrient solution at a ratio of 5%, add a rubber stopper to the shaker bottle, put it in a shaker to simulate the reservoir conditions for oxygen-limited experiments, and investigate microorganisms Effect of metabolites on emulsifying crude oil.

[0061] 2. The experimental temperature is 40°C. The shaker rotates at 100 revolutions per minute.

[0062] 3. Experimental results

[0063] After 5 days of cultivation, microorganisms and thei...

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Abstract

The invention discloses a method for increasing petroleum production rate of a low-permeability oil reservoir through air and microorganism flooding. The method includes that microorganisms, nutritional agents and air are provided, and the microorganisms are endogenous microorganisms in the oil reservoir; an air-microorganism composite injection mode refers to injecting the microorganisms and the nutritional agents into the oil reservoir by means of a slug and then injecting an air slug into the oil reservoir in a form a small slug. The microorganisms utilize the nutritional agents and the air for quick fermentation and consuming oxygen in the air, oxygen content is reduced to be below 3% which is a safe value, and microorganism metabolism surfactant emulsifies crude oil, emulsified particles expand wave and size while lowering flow seepage resistance; rock pore and throat radius of the low-permeability oil reservoir are small, microbial thalluses have wave and size expanding effect, and crude oil recovery rate is increased further.

Description

technical field [0001] The invention relates to a method for increasing oil recovery by air microbial composite flooding in low-permeability oil reservoirs, in particular to using microorganisms to quickly consume oxygen in the air to reduce the safety risk caused by the existence of oxygen; zone, expanding the swept volume; using microbial metabolites to improve the properties of the oil-water interface to enhance oil recovery. Background technique [0002] The air flooding method is a method in which air is injected into the oil reservoir through an air compressor to drive oil. The air entering the oil reservoir mainly undergoes low-temperature oxidation and high-temperature oxidation reactions with crude oil. Low temperature oxidation is suitable for light and conventional crude oils. The main reasons for the application of air flooding are firstly that the source of air is wide and not restricted by space and region; secondly, the cost is low and applicable to a wide r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22C12N1/00
Inventor 马挺李国强
Owner NANKAI UNIV