A Method for Enhanced Reservoir Recovery by Endogenous Microbial Compound Flooding

An endogenous microbial and composite flooding technology, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of difficult control of biological inhibitor dose, plugging of low permeability layers, and separate injection of activator systems, etc., to achieve The effect of the field test is good, the input-output ratio is high, and the treatment process is simple

Active Publication Date: 2022-02-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After literature search, patent number: "CN103114833A", patent name: "A microbial oil recovery method for activating functional flora in deep reservoirs", discloses a method of preventing the injection of functional flora in the near wellbore zone by injecting biological inhibitors. The problem of excessive consumption of activator, so that the activator can reach the depth of the oil reservoir to activate functional bacteria, the disadvantage of this method is: (1) a large number of inhibitors used in this method lead to a sharp increase in the cost of field tests; (2) the cost of a large number of inhibitors The use leads to increased difficulty in the treatment of produced water; (3) It is difficult to control the amount of biological inhibitors injected into the reservoir, and excessive use may inhibit the endogenous microorganisms in the deep reservoir
However, the disadvantage of this method is that usually the same oil layer corresponds to multiple water injection wells or the same water injection well corresponds to multiple oil layers with different permeability, and it is difficult to ensure that the activator systems of high, medium and low permeability oil layers are respectively injected into the corresponding oil layers , therefore, to a certain extent, it affects the field test results
However, this method has the following problems: the activators are all injected from the water well at the same time, and the injection of production differentiation is not realized according to the level of the oil layer permeability, resulting in the waste of biosurfactant functional bacteria or activators injected into the high permeability oil layer, and at the same time Functional microorganisms or activators injected into low-permeability reservoirs to produce biopolymers cause plugging of low-permeability reservoirs, which further aggravates the degree of heterogeneity of the reservoir, thereby affecting the effect of field tests to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A test reservoir AF in Shengli Oilfield 2 General situation: Reservoir temperature is 65°C, permeability is 800×10 -3 μm 2 , formation water salinity 12562mg / L, crude oil viscosity 1285mPa·s, comprehensive water content 95.2%, daily liquid production 1200m 3 , pore volume 5.2×10 5 m 3 , geological reserves 2.0×10 5 t, the total bacterial concentration in formation water is 2.0×10 5 individual / ml, methanogenic bacteria 2.0×10 4 Individuals / ml, hydrocarbon oxidizing bacteria 1.0×10 4 pieces / ml. Utilize method of the present invention to implement field test in this test reservoir, concrete steps are as follows:

[0034] (1) Screening of test reservoirs

[0035] The screening of test reservoirs needs to meet the following conditions: temperature 100×10 -3 μm 2 , salinity 4 Individuals / ml, and one or more of methanogenic bacteria, hydrocarbon oxidizing bacteria and biosurfactant-producing bacteria exist.

[0036] Test Reservoir AF 2 The reservoir temperature is...

Embodiment 2

[0055] DE of a test reservoir in Shengli Oilfield 5 General situation: Reservoir temperature is 70°C, permeability is 1000×10 -3 μm 2 , formation water salinity 9825mg / L, crude oil viscosity 2560mPa·s, comprehensive water content 97.0%, daily liquid production 1500m 3 , pore volume 7.0×10 5 m 3 , geological reserves 3.2×10 5 t, the total bacterial concentration in formation water is 5.0×10 5 individual / ml, methanogenic bacteria 1.0×10 4 Individuals / ml, hydrocarbon oxidizing bacteria 1.0×10 4 pcs / ml, Bacillus subtilis 2.0×10 4 pieces / ml. Utilize method of the present invention to implement field test in this test reservoir, concrete steps are as follows:

[0056] (1) Screening of test reservoirs

[0057] The screening of test reservoirs needs to meet the following conditions: temperature 100×10 -3 μm 2 , salinity 4 Individuals / ml, and one or more of methanogenic bacteria, hydrocarbon oxidizing bacteria and biosurfactant-producing bacteria exist.

[0058] Test reser...

Embodiment 3

[0077] A test reservoir AF in Shengli Oilfield 5 General situation: Reservoir temperature is 76°C, permeability is 900×10 -3 μm 2 , formation water salinity 17210mg / L, crude oil viscosity 985mPa·s, comprehensive water content 98.0%, daily liquid production 1500m 3 , pore volume 8.5×10 5 m 3 , geological reserves 5.3×10 5 t, the total bacterial concentration in formation water is 5.0×10 5 Individuals / ml, hydrocarbon oxidizing bacteria 2.0×10 4 individual / ml, Bacillus 1.0×10 4 pieces / ml. Utilize method of the present invention to implement field test in this test reservoir, concrete steps are as follows:

[0078] (1) Screening of test reservoirs

[0079] The screening of test reservoirs needs to meet the following conditions: temperature 100×10 -3 μm 2 , salinity 4 Individuals / ml, and one or more of methanogenic bacteria, hydrocarbon oxidizing bacteria and biosurfactant-producing bacteria exist.

[0080] Test Reservoir AF 5 The reservoir temperature is 76°C and the ...

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Abstract

The invention belongs to the technical field of tertiary oil recovery, and in particular relates to a method for increasing oil recovery by endogenous microbial compound flooding. The specific steps of the method are as follows: screening of test reservoirs; oil-water separation of produced fluid in test reservoirs; pretreatment of formation water; preparation of activators; field injection of activators; evaluation of field test effects. The invention improves the metabolic rate and activity of endogenous microorganisms through the action of the pulse wave physical field, promotes the crude oil degradation of hydrocarbon oxidizing bacteria, the gas production of methanogenic bacteria and the biosurfactant production of biosurfactant bacteria, and realizes In-situ degradation of crude oil, viscosity reduction and formation plugging removal, thereby greatly improving the recovery of crude oil in test reservoirs. Therefore, the present invention can be widely applied in the production stimulation technology of oil reservoir.

Description

technical field [0001] The invention belongs to the technical field of tertiary oil recovery, and in particular relates to a method for increasing oil recovery by endogenous microbial compound flooding. 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. The endogenous microbial oil recovery technology is a technology that injects activators into the oil reservoir to activate the endogenous microorganisms in the oil reservoir, and utilizes the comprehensive effects of the microorganisms themselves and their metabolites to enhance oil recovery. [0003] After literature search, pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22
CPCE21B43/16
Inventor 郭辽原胡婧曹嫣镔吴晓玲刘方王新耿雪丽冯云尹德江张吉星
Owner CHINA PETROLEUM & CHEM CORP
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