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Microbial enhanced oil recovery method

A microbial oil recovery and biological surface technology, which is applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of affecting the recovery rate, limited scope of action, and high polymer prices, so as to improve crude oil recovery. rate and degree of recovery, a wide range of applications, the effect of expanding the swept volume

Active Publication Date: 2015-12-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polymers are used for deep plugging in this method. Due to the high price and refractory properties of polymers, the cost increases and the subsequent water treatment has a serious impact; The range of action is limited, so it affects the range of enhanced oil recovery to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A block L in Shengli Oilfield is a loose sandstone reservoir with high salinity, medium-high permeability, and medium-high viscosity, with a burial depth of 1253m-1327m, a reservoir temperature of 53°C, a reservoir pressure of 11.2MPa, a porosity of 32.5%, and a pore volume of 2.8 ×10 4 m 3 , permeability 1200×10 -3 μm 2 , recoverable reserves 6.9×10 4 t, the formation water salinity is 12350 mg / L, and the total number of oil wells is 10. See Table 1 for the statistics of oil well permeability, liquid production and oil layer thickness.

[0030] Table 1. Statistical table of permeability, fluid production and oil layer thickness of oil wells in block L

[0031] serial number

hashtag

Permeability, 10 -3 μm 2

Daily liquid volume, m 3

Oil layer thickness, m

1

L-1

1500

98

12.5

2

L-2

1100

80

9.8

3

L-3

950

72

15.6

4

L-4

1200

95

13.3

5

L-5 ...

Embodiment 2

[0043] A block M in Shengli Oilfield is a water-flooding sandstone reservoir with high salinity and high permeability, with a burial depth of 1528m-1672m, a reservoir temperature of 75°C, a reservoir pressure of 13.5MPa, a porosity of 33.2%, and a pore volume of 9.2×10 5 m 3 , permeability 1500×10 -3 μm 2 , recoverable reserves 7.5×10 5 t, the formation water salinity is 14570 mg / L, and there are 12 oil wells in total. See Table 2 for the statistics of oil well permeability, liquid production and oil layer thickness.

[0044] Table 2 Statistical table of permeability, fluid production and oil layer thickness of oil wells in block M

[0045] serial number

hashtag

Permeability, 10 -3 μm 2

Daily liquid volume, m 3

Oil layer thickness, m

1

M-1

1300

83

9.5

2

M-2

1800

98

10.3

3

M-3

2200

105

12.8

4

M-4

1500

102

10.9

5

M-5

1000

75

6.2

...

Embodiment 3

[0058] A block P in Shengli Oilfield is a sandstone reservoir with medium salinity and high permeability, with a burial depth of 985m-1178m, a reservoir temperature of 65°C, a reservoir pressure of 9.0MPa, a porosity of 34.2%, and a pore volume of 4.5×10 5 m 3 , permeability 1800×10 -3 μm 2 , recoverable reserves 9.6×10 4 t, the formation water salinity is 5630 mg / L, and there are 8 oil wells in total. See Table 3 for the permeability, fluid production and oil layer thickness of block P oil wells.

[0059] Table 3 Statistical table of permeability, fluid production and oil layer thickness of oil wells in block P

[0060] serial number

hashtag

Permeability, 10 -3 μm 2

Daily liquid volume, m 3

Oil layer thickness, m

1

P-1

3200

156

12.3

2

P-2

1900

98

8.5

3

P-3

1200

82

7.6

4

P-4

1000

75

13.5

5

P-5

2500

128

11.4

6

P-6

2...

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Abstract

The invention discloses a microbial enhanced oil recovery method and belongs to the technical field of tertiary oil recovery. The method is characterized by comprising the following steps: 1, conducting displacement of reservoir oil through biosurfactant; 2, adjusting injection-production patterns; 3, conducting displacement of reservoir oil through indigenous microorganisms; 4, conducting oil recovery through microorganism single well huff-and-puff. According to the method, firstly, the biosurfactant is injected, so that the displacement efficiency of a water-driven oil reservoir is improved; then through adjustment of the injection-production patterns, the swept volume, in the oil reservoir, of the indigenous microorganisms is expanded; finally, through the microorganism single well huff-and-puff treatment, crude oil in the immediate vicinity of an oil well is displaced out, and thereby the purpose of further raising the recovery ratio of the oil reservoir is achieved finally. The method has the advantages that activator has the advantages of being wide in source, low in price and harmless to strata; the method is wide in oil reservoir application range and particularly suitable for an oil reservoir which is exploited in a water-driven mode and is medium and high in permeability; the process is simple, and the pertinence and operability are great; the field test effect is good, and the enhanced oil recovery rate is testified by field tests to be larger than 15.0%. Therefore, the method can be widely applied to the technical field of microbial enhanced oil recovery.

Description

technical field [0001] The invention belongs to the technical field of tertiary oil recovery, and in particular relates to a method for microbial oil recovery. Background technique [0002] Microbial Enhanced Oil Recovery refers to the technology that uses microorganisms (mainly bacteria, archaea) and their metabolites to increase crude oil production and recovery. Compared with other tertiary oil recovery technologies, microbial oil recovery technology has a wide range of applications and simple processes. , good economic benefits, no pollution and other characteristics, has a good application prospect, so it has received more and more attention. [0003] Due to the long-term water flooding development of the reservoir, local large pores have been formed, and conventional water flooding is difficult to further increase the recovery rate. Microbial flooding, on the one hand, uses deep profile control to increase the swept volume, and on the other hand, uses microbial floodi...

Claims

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Application Information

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IPC IPC(8): E21B43/22
Inventor 郭辽原王静林军章段传慧宋欣徐闯吴晓玲刘涛冯云曹嫣镔
Owner CHINA PETROLEUM & CHEM CORP
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