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Method for profile control and oil displacement by immobilizing microorganisms

A microbial immobilization and microbial technology, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve the problems of short microbial retention time, failure to reach clogged formations, low oil recovery rate, etc., and achieve improved Oil recovery, high oil displacement effect, and long retention time

Inactive Publication Date: 2011-01-05
E TECH ENERGY TECH DEV CORP
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Problems solved by technology

However, this method is limited by the size of microbial cells, and can only block formations with small pores. For areas with slightly larger pores, microorganisms pass through quickly with water injection, which cannot achieve the purpose of blocking formations and releasing viscous polymers for profile control.
This method has technical problems such as short microbial retention time, poor oil displacement effect, and low oil recovery rate.

Method used

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  • Method for profile control and oil displacement by immobilizing microorganisms
  • Method for profile control and oil displacement by immobilizing microorganisms

Examples

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Embodiment 1

[0028] Refer to attached figure 1 .

[0029] A method for microbial immobilization profile control and oil displacement. Microorganisms are injected into oil wells for profile control and oil displacement. The microorganisms are immobilized before being injected into oil wells. The immobilization process includes:

[0030] 1. Preparation of bacterial suspension: Use the beneficial microorganisms screened in the oil field to provide the necessary nutrient source for the microorganisms in the fermenter of the ground factory, so that the microorganisms can proliferate, and the concentration of the microorganisms reaches 10 6 more than one / ml. Beneficial microorganisms are bacteria that can produce surfactants, emulsifiers, viscous polymers, gas production, etc. in the formation environment, which are beneficial to improving the properties of crude oil. The types of beneficial microorganisms mainly include: one or more of fermentation bacteria, hydrocarbon degrading bacteria, ac...

Embodiment 2

[0035] As in Example 1. Wherein, when preparing the bacterial suspension, a 1.5% sodium alginate solution was prepared and filtered with a 0.22 μm microporous membrane under pressure. Preparation of microcapsules: use a microcapsule instrument to spray the suspension into 8% calcium isooctanoate solution by adjusting the size of the nozzle, controlling the flow rate and other process parameters, and let it stand for calcification for 4 hours to obtain a diameter in the range of 40μm-80μm microcapsules inside. Wash the microcapsules with deionized water.

[0036] The role of microbial microcapsules in enhancing oil recovery is as follows:

[0037] which performed

[0038] In this example, the microcapsules encapsulating microorganisms do not affect the migration of bacterial nutrition and beneficial metabolites, and the microorganisms in the microcapsules can prolong the action time in the bottom layer, which can improve the fluidity of crude oil; adjust the water f...

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Abstract

The invention relates to a method for profile control and oil displacement by immobilizing microorganisms, and belongs to the technical field of crude oil production increase. In the method for profile control and oil displacement by immobilizing the microorganisms, the microorganisms are injected into an oil well for profile control and oil displacement. The method is characterized in that: immobilization is performed on the microorganisms before the microorganisms are injected into the oil well, and comprises the following steps of: 1) preparing bacterial suspension: performing amplification culture on beneficial microorganisms separated from stratum of the oil field to make the bacteria more than 105 per milliliter, and mixing with 1 to 5 percent sodium alginate solution to prepare the bacterial suspension; and 2) preparing microcapsules: dripping the bacterial suspension into 2 to 10 percent octoate solution at the temperature of between 1 to 10 DEG C, calcifying for 2 to 8 hours, and washing by using deionized water. The method has the advantages of simple operation, reliable performance, viscosity break of crude oil, capacity of blocking large porous channels, long retention time of the beneficial bacteria, high oil displacement effect, improvement of crude oil recovery ratio, wide applicable range and the like.

Description

technical field [0001] The invention belongs to the technical field of crude oil production enhancement, and in particular relates to a method for immobilized microorganisms to profile control and drive oil. Background technique [0002] At present, microbial profile control technology is a high-tech biotechnology developed at home and abroad. At present, the more common biological profile control method is to directly inject microorganisms to block the formation pores, or use the viscous polymer metabolized by the microorganisms to block the formation pores for profile control and oil displacement. However, this method is limited by the size of microbial cells, and can only block formations with small pores. For areas with slightly larger pores, microorganisms pass through quickly with water injection, which fails to achieve the purpose of blocking formations and releasing viscous polymers for profile control. The method has technical problems such as short microorganism r...

Claims

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Application Information

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IPC IPC(8): E21B43/22
Inventor 胡欣赵秀兰
Owner E TECH ENERGY TECH DEV CORP
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