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A method for oil recovery by endogenous microorganisms

A technology of endogenous microorganisms and oil layers, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, 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 recovery of test blocks. Yield level and other issues to achieve the effect of avoiding waste, facilitating on-site promotion and application, and saving consumption

Active Publication Date: 2018-01-16
大庆三采技术有限公司
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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

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  • A method for oil recovery by endogenous microorganisms
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  • A method for oil recovery by endogenous microorganisms

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Block A of an oilfield, the reservoir temperature is 56°C, and the permeability is 1500×10 -3 um 2 , porosity 33.9%, crude oil viscosity 956mPa.s, geological reserves 3.120×10 5 t, the formation water salinity is 7650mg / L, the average water content of the block before the test is 93.1%, the oil layer parameters of the block and the corresponding water wells are shown in Table 1.

[0032] Table 1. Reservoir parameters of Block A and corresponding water wells

[0033] serial number

layers

Permeability, 10 -3 um 2

Corresponding well

1

A 1

1200

A 11

2

A 2

2000

A 21

3

A 3

300

A 31

4

A 4

1000

A 41

5

A 5

600

A 51

6

A 6

2300

A 61

[0034] Utilize the method of the present invention to implement endogenous microbial flooding field test in block A, concrete implementation steps are as follows:

[0035] (1) Reservoir screening

[0036] The criteri...

Embodiment 2

[0058] In block B of an oilfield, the reservoir temperature is 63°C, the reservoir pressure is 9.2MPa, and the permeability is 1800×10 -3 um 2 , porosity 34.3%, crude oil viscosity 3280mPa.s, geological reserves 4.3×10 5 t, the formation water salinity is 16560mg / L, the average water content of the block before the test is 96.3%, the oil layer parameters of the block and the corresponding water wells are shown in Table 3.

[0059] Table 3 Block B reservoir parameters and corresponding water wells

[0060] serial number

layers

Permeability, 10 -3 um 2

Corresponding well

1

B 1

1400

B 11

2

B 2

600

B 21

3

B 3

800

B 31

4

B 4

2000

B 41

5

B 5

3200

B 51

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

[0062] (1) Reservoir screening

[0063] The criteri...

Embodiment 3

[0086] In block C of an oilfield, the reservoir temperature is 83°C, the reservoir pressure is 11.7MPa, and the permeability is 1200×10 -3 um 2 , porosity 35.8%, crude oil viscosity 1170mPa.s, geological reserves 6.30×10 5 t, the formation water salinity is 15365mg / L, the average water content of the block before the test is 97.3%, the oil layer parameters of the block and the corresponding water wells are shown in Table 5.

[0087] Table 5 Block C reservoir parameters and corresponding wells

[0088]

[0089]

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

[0091] (1) Reservoir screening

[0092]The criteria for reservoir screening are: the reservoir temperature is less than 90°C, and the permeability is 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.

[...

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Abstract

The invention belongs to the technical field of tertiary oil recovery and particularly relates to an indigenous microbial enhanced oil recovery method. The method specifically comprises the following steps of screening of oil reservoirs, determination of high, medium and low-permeability oil layers, determination of activation agent systems, determination of field injection processes, and the field testing stage. According to the method, different activation agent systems and field injection processes are selected for the oil layers with different magnitudes of permeability in a target oil reservoir, so that indigenous microbes in the different oil layers are well activated; accordingly, the field testing effect of the indigenous microbe-flooding oil reservoirs can be improved effectively. Meanwhile, the method has the characteristics of being simple in process and high in pertinence and operability. Thus, 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 oil recovery by endogenous microorganisms. Background technique [0002] Microbial oil recovery refers to the comprehensive action of microorganisms and their metabolites with reservoir rocks and fluids to improve the oil-water mobility ratio, thereby achieving the purpose of enhancing oil recovery. Microbial oil recovery technology has the advantages of low investment cost, no pollution to the environment and a wide range of reservoir adaptation, so it has broad field application prospects. Microbial oil recovery is divided into two types: endogenous microbial oil recovery and exogenous microbial oil recovery according to the source of microorganisms. Among them, the endogenous microbial oil recovery technology injects activators into the oil reservoir to activate the endogenous microorganisms in the oil reservoir, using the microorganisms ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22E21B43/20
CPCE21B43/16E21B43/20
Inventor 杜国栋唐守忠王智晓杨帆韩小军张康尉翔王婷李娟王稳
Owner 大庆三采技术有限公司
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