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A method for directional regulation of endogenous functional microorganisms in oil reservoirs

A technology of functional microorganisms and microorganisms, which is applied in chemical instruments and methods, earth-moving drilling and drilling compositions, etc., can solve the problems of directional and efficient activation of functional microorganisms, poor targeting of functional microorganisms, etc., and achieves good field test results. The effect of reducing the dosage and the method is reasonable

Active Publication Date: 2022-04-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since different types of microorganisms have very similar nutrient requirements, there is a nutrient competition relationship between functional microorganisms and harmful microorganisms. The activator injected into the formation will be metabolized and utilized by harmful microorganisms while activating functional microorganisms. Therefore, traditional methods use activators Directional regulation of functional microorganisms in reservoirs is poorly targeted, and the targeted and efficient activation of functional microorganisms cannot be truly achieved by changing the components of the activator, which limits the field test effect of endogenous microbial flooding technology to a certain extent

Method used

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  • A method for directional regulation of endogenous functional microorganisms in oil reservoirs
  • A method for directional regulation of endogenous functional microorganisms in oil reservoirs
  • A method for directional regulation of endogenous functional microorganisms in oil reservoirs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Test block G of an oil production plant in Shengli Oilfield 12 Overview: Reservoir temperature is 70°C, reservoir pressure is 12.3MPa, reservoir thickness is 6.5m, permeability is 800×10 -3 μm 2 , porosity 28%, crude oil viscosity 600mPa·s, comprehensive water cut 96.5%, recovery degree 15.8%, formation water salinity 11500mg / L, pore volume 2.0×10 5 m 3 , geological reserves 7.2×10 4 t. Utilize the method of the present invention to carry out microbial flooding to enhance oil recovery in this block, and concrete steps are as follows:

[0039] (1) Screening of test reservoirs

[0040] After sampling, testing and analysis, the test block G 12 There are emulsifier-producing microorganisms Brevibacterium and sulfate-reducing bacteria Desulfovibrio in formation water. Meet the screening criteria of the reservoir of the present invention.

[0041] (2) Phage isolation and amplification of sulfate-reducing bacteria

[0042] Sulfate-reducing bacteria phage isolation: ta...

Embodiment 2

[0064] Test block G of an oil production plant in Shengli Oilfield 18 Overview: Reservoir temperature is 72°C, reservoir pressure is 10.3MPa, reservoir thickness is 10.8m, permeability is 1200×10 -3 μm 2 , porosity 32.5%, crude oil viscosity 1523mPa·s, comprehensive water cut 97.2%, recovery degree 15.2%, formation water salinity 25682mg / L, pore volume 5.0×10 5 m 3 , geological reserves 1.2×10 5 t. Utilize the method of the present invention to carry out microbial flooding to enhance oil recovery in this block, and concrete steps are as follows:

[0065] (1) Screening of test reservoirs

[0066] After sampling, testing and analysis, the test block G 18 Biosurfactant-producing microorganisms Bacillus and sulfate-reducing bacteria Desulfococcus are present in formation water. Meet the screening criteria of the reservoir of the present invention.

[0067] (2) Phage isolation and amplification of sulfate-reducing bacteria

[0068] Sulfate-reducing bacteria phage isolation...

Embodiment 3

[0090] Test block F of an oil production plant in Shengli Oilfield 21 Overview: Reservoir temperature is 85°C, reservoir pressure is 13.2MPa, reservoir thickness is 15.2m, permeability is 1000×10 -3 μm 2 , porosity 31.2%, crude oil viscosity 1152mPa·s, comprehensive water cut 97.8%, recovery degree 23.5%, formation water salinity 22785mg / L, pore volume 8.0×10 5 m 3 , geological reserves 2.1×10 5 t. Utilize the method of the present invention to carry out microbial flooding to enhance oil recovery in this block, and concrete steps are as follows:

[0091] (1) Screening of test reservoirs

[0092] After sampling, detection and analysis, the test block F 21 There are emulsifier-producing microorganisms Rhodococcus and sulfate-reducing bacteria Desulfobacter in formation water. Meet the screening criteria of the reservoir of the present invention.

[0093] (2) Phage isolation and amplification of sulfate-reducing bacteria

[0094] Sulfate-reducing bacteria phage isolation...

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Abstract

The invention belongs to the technical field of microbial oil displacement, and in particular relates to a method for directional control of endogenous functional microorganisms in oil reservoirs. The method specifically includes the following steps: screening of test oil reservoirs, isolation and amplification of sulfate-reducing bacteria phages, screening of sulfate-reducing bacteria phages, screening of directional regulation activator systems, evaluation of oil displacement performance of directional regulation activator systems, Field test and effect evaluation. The invention has the advantages of reasonable method, simple process, simple operation, safety and reliability, less investment, low cost and good field test effect, the cost is reduced by more than 30%, and the field test improves the recovery rate by more than 20%.

Description

technical field [0001] The invention belongs to the technical field of microbial oil displacement, and in particular relates to a method for directional control of endogenous functional microorganisms in oil reservoirs. Background technique [0002] There are many types of endogenous microorganisms in oil reservoirs, including functional microorganisms that are beneficial to oil production, and many microorganisms that are harmful to the petroleum industry, such as sulfate-reducing bacteria. At present, endogenous microbial oil recovery mainly relies on injecting different activators screened indoors into the reservoir to selectively activate the functional microorganisms in the reservoir. recovery factor. Since different types of microorganisms have very similar nutrient requirements, there is a nutrient competition relationship between functional microorganisms and harmful microorganisms. The activator injected into the formation will be metabolized and utilized by harmfu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22E21B43/20E21B47/00C09K8/582
CPCE21B43/16E21B43/20E21B47/00C09K8/582
Inventor 汪庐山胡婧宋永亭汪卫东孙刚正冯云张吉星谭晓明曹嫣镔林军章
Owner CHINA PETROLEUM & CHEM CORP
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