Method of improving recovery rate of oil deposit by indigenous microbial combination flooding

An endogenous microbial and compound flooding technology, applied in the fields of fluid production, earth-moving drilling, wellbore/well components, etc., can solve the problems of difficulty, affect the effect, increase the degree of heterogeneity of the oil reservoir, and improve the production efficiency. Yield, the effect of a wide range of applications

Active Publication Date: 2020-03-31
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 well

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 of improving recovery rate of an oil deposit by indigenous microbial combination flooding.The method comprises the specific steps of screening a test oil deposit; carrying out oil-water separation on an output liquid of the test oil deposit; pre-treating formation water; preparing an activator; injecting the activator on-site; and evaluating an on-site test effect. The metabolism velocity and activity of the indigenous microorganisms are improved by a physical action of impulse waves,crude oil degradation of hydrocarbon oxidation bacteria is accelerated, aerogenesis of methanogens is promoted, and a producing biogenic surfactant for producing biogenic surfactant bacteria is promoted, so that in situ degradation and viscosity reduction of crude oil in a formation and plug removal of the formation are realized. Therefore, the recovery rate of the crude of the test oil deposit isimproved greatly. Thus, the method can be widely applied to a production increasing process of the oil deposit.

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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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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