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A method for improving the field test effect of endogenous microbial flooding

A technology of endogenous microorganisms and field tests, applied in the field of improving the field test effect of endogenous microorganisms, can solve the problems of affecting the effect, lack of effective activation, unfavorable activation of deep microorganisms, etc., to achieve cost saving, pertinence and reliability Strong operability and low mining cost

Active Publication Date: 2021-04-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of this method are: (1) different microbial flooding stages in the oil reservoir are all injected by water injection wells, which is not conducive to the activation of deep microorganisms in the oil reservoir; (2) some functional bacteria only exist in the production well zone, and the patent No consideration, lack of effective activation; (3) The full coverage of microbial action in reservoirs from water injection wells to production wells has not been achieved, affecting the effect of action

Method used

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  • A method for improving the field test effect of endogenous microbial flooding
  • A method for improving the field test effect of endogenous microbial flooding
  • A method for improving the field test effect of endogenous microbial flooding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] General situation of the test reservoir A: the reservoir temperature is 60°C, the reservoir pressure is 10MPa, the reservoir thickness is 8m, and the permeability is 500×10 -3 μm 2 , formation water salinity 8000mg / L, porosity 23%, crude oil viscosity 300mPa·s, comprehensive water content 91.2%, pore volume 5×10 4 m 3 , geological reserves 2.5×10 4 t, the well pattern is 2 injection wells and 5 production wells. Utilize the method of the present invention to improve the recovery factor of this oil reservoir, concrete steps are as follows:

[0047] (1) Screening of test reservoirs

[0048] The reservoir temperature of test reservoir A is 60℃, the reservoir pressure is 10MPa, and the reservoir permeability is 500×10 -3 μm 2 , The thickness of the oil layer is 8m, the salinity of formation water is 8000mg / L, and the viscosity of crude oil is 300mPa·s. The screening criteria of the test reservoirs of the present invention are met, so the present invention can be prac...

Embodiment 2

[0073] General situation of test reservoir B: reservoir temperature is 65°C, reservoir pressure is 10.5MPa, reservoir thickness is 4.5m, permeability is 800×10 -3 μm 2 , formation water salinity 12563mg / L, porosity 25.0%, crude oil viscosity 786mPa·s, comprehensive water cut 88.0%, pore volume 7.5×10 4 m 3 , geological reserves 5.2×10 4 t, the well pattern is 1 injection well and 3 production wells. Utilize the method of the present invention to improve the recovery factor of this oil reservoir, concrete steps are as follows:

[0074] (1) Screening of test reservoirs

[0075] The reservoir temperature of test reservoir B is 65°C, the reservoir pressure is 10.5MPa, and the reservoir permeability is 800×10 -3 μm 2 , The thickness of the oil layer is 4.5m, the salinity of formation water is 12563mg / L, and the viscosity of crude oil is 786mPa·s. The screening criteria of the test reservoirs of the present invention are met, so the present invention can be practiced.

[007...

Embodiment 3

[0101] General situation of the test reservoir C: the reservoir temperature is 67°C, the reservoir pressure is 12.3MPa, the reservoir thickness is 7m, and the permeability is 1200×10 -3 μm 2 , formation water salinity 7658mg / L, porosity 32.5%, crude oil viscosity 1256mPa·s, comprehensive water content 95.3%, pore volume 8.2×10 4 m 3 , geological reserves 6.5×10 4 t, the well pattern is 2 injection wells and 4 production wells. Utilize the method of the present invention to improve the recovery factor of this oil reservoir, concrete steps are as follows:

[0102] (1) Screening of test reservoirs

[0103] The reservoir temperature of test reservoir C is 67°C, the reservoir pressure is 12.3MPa, and the reservoir permeability is 1200×10 -3 μm 2 , The thickness of the oil layer is 7m, the salinity of formation water is 7658mg / L, and the viscosity of crude oil is 1256mPa·s. The screening criteria of the test reservoirs of the present invention are met, so the present inventio...

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Abstract

The invention belongs to the technical field of tertiary oil recovery, and specifically relates to a method for improving the field test effect of endogenous microbial oil displacement. The method specifically includes the following steps: screening of test oil reservoirs; detection of endogenous functional microorganisms in water injection wells; endogenous functional microorganisms in production wells Determination of injection well activator; determination of production well activator; water injection well activator and air injection; injection activator production well determination; production well activator injection; field test results statistics and analysis. The invention injects the activator into the water injection well and the production well separately, avoids the adsorption and consumption of the activator by the long-distance migration of the activator, and saves the cost; at the same time, the present invention is more pertinent and operable in on-site implementation, and is different from the traditional Compared with the method, the method has the advantages of low mining cost, no need for subsequent treatment of the produced fluid, and safety and environmental protection. Therefore, it can be widely used in field tests of microbial 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 the field test effect of endogenous microbial flooding. Background technique [0002] Endogenous microbial flooding refers to the injection of activators into water injection wells, and the use of activated endogenous microorganisms to multiply at the oil-water interface of the reservoir to produce surface active substances and biogas, thereby increasing the mobility of crude oil and changing the wettability of rock surfaces. The oil film is stripped from the rock surface to dredge the seepage channel and enhance the recovery rate. [0003] Since the distance from the injection well to the production well is long, and the microorganisms from the injection well to the production well have experienced a process from aerobic to facultative aerobic to anaerobic, involving different types of functional microorganisms, and due to During...

Claims

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Application Information

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IPC IPC(8): E21B49/00E21B43/22C09K8/582
CPCC09K8/582E21B43/16E21B49/00
Inventor 刘涛赵明辰巴燕宋欣段传慧谭晓明冯云郭辽原孙刚正胡婧
Owner CHINA PETROLEUM & CHEM CORP
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