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Method for increasing crude oil recovery rate through indigenous microbial drive

A technology of endogenous microorganisms and recovery rate, applied in chemical instruments and methods, production fluids, earthwork drilling and production, etc., can solve the waste of activators, does not take into account that different water wells correspond to oil layers with different permeability, and affects the test block The degree of recovery rate and other issues can be avoided to avoid waste, facilitate on-site promotion and application, and save consumption

Active Publication Date: 2016-07-20
大庆兴田科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the main process adopted in the field test of endogenous microbial flooding to enhance oil recovery is to inject the selected activator into the water wells of the test block at a certain injection rate and concentration in a continuous or slug manner. The injection of activator adopts the method of injecting all water wells at the same time, which does not take into account that different water wells correspond to oil layers with different permeability. Therefore, most of the activators are injected into high-permeability oil layers, while the amount of activator injected into low-permeability oil layers is small. On the one hand, it causes waste of activator, on the other hand, it greatly affects the overall recovery rate of the test block

Method used

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  • Method for increasing crude oil recovery rate through indigenous microbial drive
  • Method for increasing crude oil recovery rate through indigenous microbial drive
  • Method for increasing crude oil recovery rate through indigenous microbial drive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Block H of an oilfield, the reservoir temperature is 62℃, the reservoir pressure is 10.1MPa, and the permeability is 1800×10 -3 um 2 , porosity 34.2%, crude oil viscosity 1560mPa.s, geological reserves 3.60×10 5 t, the salinity of the formation water is 16000mg / L, the average water content of the block before the test is 98.5%, and the oil layer parameters of the block and the corresponding wells are shown in Table 1.

[0032] Table 1 Block H oil layer parameters and corresponding wells

[0033] serial number

horizon

permeability, 10 -3 um 2

Corresponding well

1

H 1

2100

A 1

2

H 2

3200

A 2

3

H 3

200

A 3

4

H 4

1500

A 4

5

H 5

500

A 5

6

H 6

1200

A 6

[0034] Utilize the method of the present invention to implement the endogenous microbial oil flooding field test in block H, and the specific implementation steps are as follows: ...

Embodiment 2

[0058] Block K of an oilfield, the reservoir temperature is 68℃, the reservoir pressure is 9.5MPa, and the permeability is 1500×10 -3 um 2 , porosity 34.8%, crude oil viscosity 1220mPa.s, geological reserves 5.0×10 5 t, the salinity of formation water is 8500mg / L, the average water content of the block before the test is 96.5%, and the oil layer parameters of the block and the corresponding wells are shown in Table 3.

[0059] Table 3 Block K oil layer parameters and corresponding wells

[0060] serial number

horizon

permeability, 10 -3 um 2

Corresponding well

1

K 1

1600

B 1

2

K 2

300

B 2

3

K 3

600

B 3

4

K 4

2700

B 4

5

K 5

1900

B 5

[0061] Utilize the method of the present invention to implement the endogenous microbial oil flooding field test in block K, and the specific implementation steps are as follows:

[0062] (1) Screening of reservoirs

...

Embodiment 3

[0086] Block M of an oilfield, the reservoir temperature is 78℃, the reservoir pressure is 13.2MPa, and the permeability is 1300×10 -3 um 2 , porosity 35.3%, crude oil viscosity 2130mPa.s, geological reserves 7.20×10 5 t, the salinity of the formation water is 19800mg / L, the average water content of the block before the test is 97.8%, and the oil layer parameters of the block and the corresponding wells are shown in Table 5.

[0087] Table 5 Block M oil layer parameters and corresponding wells

[0088]

[0089]

[0090] Utilize the method of the present invention to implement endogenous microbial oil flooding field test in block M, and the specific implementation steps are as follows:

[0091] (1) Screening of reservoirs

[0092] The criteria for reservoir screening are: reservoir temperature less than 90℃, permeability greater than 100×10 -3 μm 2 , The viscosity of crude oil is lower than 3000mPa.s, and the salinity of formation water is lower than 50000mg / L.

[009...

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Abstract

The invention belongs to the technical field of tertiary oil recovery, and particularly relates to a method for increasing the crude oil recovery rate through indigenous microbial drive. The method specifically comprises the following steps that oil reservoirs are screened; high-permeability oil layers, middle-permeability oil layers and low-permeability oil layers are determined; activating agent systems are determined; field injection processes are determined; and field tests are conducted. Different activating agent systems and field injection processes are selected according to the oil layers with different permeability of the target oil reservoirs, indigenous microorganisms of different oil layers are well activated, and therefore the field test effect of the indigenous microbial drive oil reservoirs can be effectively improved. Meanwhile, the method has the characteristics of being simple in process and high in pertinence and operability. Accordingly, 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 improving crude oil recovery by endogenous microbial flooding. Background technique [0002] Microbial oil recovery refers to the comprehensive action of microorganisms themselves and their metabolites with reservoir rocks and fluids to improve the oil-water mobility ratio, so as to achieve the purpose of enhancing crude oil recovery. Microbial oil recovery technology has the advantages of low investment cost, no environmental pollution and wide range of reservoir adaptation, so it has broad field application prospects. Microbial oil recovery is divided into endogenous microbial oil recovery and exogenous microbial oil recovery according to different microbial sources. Among them, the endogenous microbial oil recovery technology is to inject activators into the oil reservoir to activate the endogenous microorganisms in the oil reservoir, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C09K8/58
CPCC09K8/58E21B43/16
Inventor 刘琴
Owner 大庆兴田科技有限公司
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