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A kind of microbial hydrocarbon reducing bacteria is used to reduce CO 2 Minimum Miscible Pressure Method

A technology of miscible pressure and hydrocarbon-reducing bacteria is applied in the field of reducing the minimum miscible pressure of CO2 flooding by using microbial hydrocarbon-reducing bacteria. Easy to apply effects

Inactive Publication Date: 2020-09-15
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the above method, either CO 2 The method of adding liquefied petroleum gas or adding surfactant as a regulator to reduce the minimum miscible pressure has the disadvantages of high cost and large amount, and it is difficult to effectively implement in field applications.

Method used

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  • A kind of microbial hydrocarbon reducing bacteria is used to reduce CO <sub>2</sub> Minimum Miscible Pressure Method
  • A kind of microbial hydrocarbon reducing bacteria is used to reduce CO <sub>2</sub> Minimum Miscible Pressure Method

Examples

Experimental program
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Effect test

Embodiment 1

[0038] 1) First, culture the YM8 hydrocarbon-reducing bacteria seeds in a small seed bottle. The specific conditions are: cultivate in a shaker with a temperature of 35°C and a rotating speed of 120 rpm for approximately 18 hours; then in a large seed bottle The specific conditions are: culture in a shaker with a temperature of 35°C and a rotation speed of 75 rpm, and the culture time is about 16 hours;

[0039] Among them, the medium (g / L) in the small seed bottle and the large seed bottle: sucrose 10.0, corn steep liquor 5.0, disodium hydrogen phosphate 1.0, potassium dihydrogen phosphate 0.25, sodium nitrate 1.5, magnesium sulfate 0.5, sodium chloride 3.0 , PH 7.2;

[0040] 2) Then, use the pressure difference to connect the seeds to the first-level seed tank for fermentation. The specific conditions are: the temperature is 35°C, the stirring speed is 150 rpm, and the culture time is about 24 hours to reach the required indicators; The seeds are connected to the secondary seed ...

Embodiment 2

[0045] 1) First, culture the YM8 hydrocarbon-reducing bacteria seeds in a small seed bottle. The specific conditions are: culture in a shaker at a temperature of 34°C and a rotation speed of 110 rpm for approximately 19 hours; then in a large seed bottle The specific conditions are: culture in a shaker at a temperature of 34°C and a rotation speed of 70 rpm, and the culture time is about 15 hours;

[0046] Among them, the medium (g / L) in the small seed bottle and the large seed bottle: sucrose 15.0, corn steep liquor 7.0, disodium hydrogen phosphate 0.7, potassium dihydrogen phosphate 0.4, sodium nitrate 2.0, magnesium sulfate 0.2, sodium chloride 4.0 , PH 7.3;

[0047] 2) Then, use the pressure difference to connect the seeds to the first-level seed tank for fermentation. The specific conditions are: the temperature is 34℃, the stirring speed is 160 rpm, and the culture time is about 23 hours to reach the required indicators; The seeds are connected to the secondary seed tank for...

Embodiment 3

[0052] 1) First, culture the YM8 hydrocarbon-reducing bacteria seeds in a small seed bottle. The specific conditions are: culture in a shaker with a temperature of 36°C and a rotation speed of 130 rpm for approximately 20 hours; then in a large seed bottle The specific conditions are: culture in a shaker with a temperature of 36°C and a rotation speed of 80 rpm, and the culture time is about 17 hours;

[0053] Among them, the medium (g / L) in the small seed bottle and the large seed bottle: sucrose 12.0, corn steep liquor 10.0, disodium hydrogen phosphate 0.5, potassium dihydrogen phosphate 0.5, sodium nitrate 1.8, magnesium sulfate 0.3, sodium chloride 5.0 , PH 7.4;

[0054] 2) Then, use the pressure difference to connect the seeds to the first-level seed tank for fermentation. The specific conditions are: the temperature is 36°C, the stirring speed is 140 rpm, and the culture time is about 25 hours to reach the required indicators; The seeds are connected to the secondary seed ta...

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Abstract

A method to reduce CO by using microbial hydrocarbon-reducing bacteria 2 The method of flooding the minimum miscible pressure, in the process of CO 2 Before flooding or during oil flooding, inject microbial hydrocarbon reducing bacteria fermentation liquid into the reservoir, and then inject CO 2 , until the gas-oil ratio in the producing well exceeds the dissolved gas-oil ratio under formation conditions. When the crude oil is in full contact with the fermentation liquid of microbial hydrocarbon-reducing bacteria, the content of light components increases, the viscosity decreases, and the CO 2 interaction, thereby reducing the CO 2 Drive minimum miscible pressure, greatly increase CO 2 Drive recovery rate. Experiments show that the minimum miscible pressure reduction rate is 10.67-25.30%. The method of the present invention is low in cost, and is easy to be applied in the field, has overcome the existing technology to CO 2 In the method of adding liquefied petroleum gas or adding a surfactant as a regulator to reduce the minimum miscible pressure, there are problems of high cost, large amount of use and difficulty in effective implementation.

Description

Technical field [0001] The invention belongs to the technical field of carbon dioxide miscible flooding in low-permeability oilfields, and relates to a method of using microbial hydrocarbon reducing bacteria to reduce CO 2 The method to drive the minimum miscible pressure. Background technique [0002] Carbon dioxide flooding is one of the main technologies for enhanced oil recovery at home and abroad. It has been widely used in the United States, Canada, Angola, Trinidad, Turkey and other countries and regions, especially the United States. The use of carbon dioxide enhanced oil recovery technology for crude oil production Already accounted for more than 90% of the world. Compared with water flooding, carbon dioxide has lower injection pressure and stronger injection capacity. Therefore, this technology can increase the oil recovery factor by 10-15% on the basis of conventional technology, making the recovery factor of low permeability reservoirs reach 30%. % Above, has broad a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P1/04E21B43/22E21B43/16C12R1/07
CPCC12P1/04C12N1/205C12R2001/07E21B43/16E21B43/164
Inventor 王成俊高瑞民赵丽江绍静金志高怡文倪军洪玲党海龙薛媛梁凯强王宏
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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