Method for reducing CO2 flooding minimum miscible pressure by using microbial hydrocarbon degrading bacteria

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: 2017-12-05
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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  • Method for reducing CO2 flooding minimum miscible pressure by using microbial hydrocarbon degrading bacteria
  • Method for reducing CO2 flooding minimum miscible pressure by using microbial hydrocarbon degrading bacteria

Examples

Experimental program
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Effect test

Embodiment 1

[0038] 1) First, cultivate the seeds of YM8 depressant bacteria in a small seed bottle. The specific conditions are: culture in a shaker at a temperature of 35°C and a rotation speed of 120 rpm for about 18 hours; then in a large seed bottle The specific conditions are: culture in a shaker at 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 insert the seeds into the first-level seed tank for fermentation. The specific conditions are: the temperature is 35°C, the stirring speed is 150 rpm, and the cultivation time is about 24 hours to reach the required index; Put the seeds into the secondary seed tank for fermentation,...

Embodiment 2

[0045] 1) First, cultivate the seeds of YM8 depressant bacteria 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 about 19 hours; then in a large seed bottle The specific conditions are as follows: 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 insert the seeds into the first-level seed tank for fermentation. The specific conditions are: the temperature is 34°C, the stirring speed is 160 rpm, and the cultivation time is about 23 hours to reach the required index; Put the seeds into the secondary seed tank for fer...

Embodiment 3

[0052] 1) First, cultivate the seeds of YM8 depressant bacteria in a small seed bottle. The specific conditions are: culture in a shaker at a temperature of 36°C and a rotation speed of 130 rpm for about 20 hours; then in a large seed bottle The specific conditions are as follows: culture in a shaker at 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 insert the seeds into the first-level seed tank for fermentation. The specific conditions are: the temperature is 36°C, the stirring speed is 140 rpm, and the cultivation time is about 25 hours to reach the required index; Put the seeds into the secondary seed tank for fe...

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Abstract

A method for reducing a CO2 flooding minimum miscible pressure by using microbial hydrocarbon degrading bacteria is characterized in that a microbial hydrocarbon degrading bacterium fermentation solution is injected to a reservoir stratum before CO2 flooding or during displacement of reservoir oil, and then CO2 is injected until the gas-oil ratio in a production well exceeds the dissolved gas-oil ratio under the stratum condition. Crude oil fully contacts with the microbial hydrocarbon degrading bacterium fermentation solution to rise the content of lightweight components and reduce the viscosity, and the obtained crude oil interacts with CO2, so the CO2 flooding minimum miscible pressure is reduced, and the CO2 flooding recovery ratio is greatly improved. Experiments show that the minimum miscible pressure is reduced by 10.67-25.30%. The method has the advantages of low cost, easiness in onsite application, and solving the problems of high cost, high dosage and difficulty in effective enforcement of methods for reducing the minimum miscible pressure through adding liquefied petroleum gas or a surfactant as a regulator to the CO2 in the prior art.

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 for reducing CO by using microbial hydrocarbon-reducing bacteria. 2 The method of driving the minimum miscibility pressure. Background technique [0002] Carbon dioxide flooding is one of the main technologies for enhanced oil recovery at home and abroad, and has been widely used in the United States, Canada, Angola, Trinidad, Turkey and other countries and regions, especially in the United States. Has 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 oil recovery by 10-15% on the basis of conventional technology, and make the recovery of low-permeability reservoirs reach 30% % above, has broad application prospects. At present, most of the low-permeability oil reservoirs put int...

Claims

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Application Information

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Patent Type & Authority Applications(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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