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Directional adjustment and control method for oil reservoir endogenous functional microbes

A technology of functional microorganisms and microorganisms, which is applied in the direction of chemical instruments and methods, earth drilling, drilling compositions, etc., can solve the problems of poor pertinence of functional microorganisms and inability to activate functional microorganisms in a targeted and efficient manner, and achieve reduced dosage and field tests Good effect and improved activation efficiency

Active Publication Date: 2020-05-08
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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  • Directional adjustment and control method for oil reservoir endogenous functional microbes
  • Directional adjustment and control method for oil reservoir endogenous functional microbes
  • Directional adjustment and control method for oil reservoir endogenous functional microbes

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 particularly relates to a directional adjustment and control method for oil reservoir endogenous functional microbes. The method specifically comprises the following steps of screening a test oil reservoir, separating and amplifying sulfate reducing bacteria phages, screening the sulfate reducing bacteria phages, screening a directional adjustment and control activator system, evaluating oil displacement performance of the directional adjustment and control activator system, performing a field test and performing effect evaluation. The method disclosed by the invention has the advantages of being reasonable, simple in process, simple to operate, safe and reliable, less in investment, low in cost and good in field test effect, reduces the cost by 30% or more, and improves the recovery efficiency by 20% or more according to the field test.

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 Applications(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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