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A method for regulating the growth and metabolism of endogenous microorganisms in oil reservoirs

A technology of endogenous microorganisms and oil reservoirs, applied in the field of microbial oil recovery, can solve the problems of no contribution to the oil displacement effect, obvious oil displacement effect, and water cut reduction. out higher effect

Active Publication Date: 2021-09-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lag phase: the microorganisms have just come into contact with the activator, their metabolic system needs to adapt to the new environment, the cell proliferation is slow, the bacterial concentration does not increase significantly, and the water content of the produced fluid does not contribute to the oil displacement effect; logarithmic phase: after the microorganisms adapt to the activator , the growth rate is gradually accelerated, and the bacterial concentration increases exponentially. With the active metabolic activities of the bacterial body, the water content gradually decreases; the stable period: the number of bacteria remains relatively stable, the bacterial concentration reaches the peak level, and the accumulation of cell metabolites reaches the highest peak. During this period, the water content of the produced fluid decreased significantly, and the oil displacement effect was obvious; the decline period: the death rate of bacteria was greater than the rate of new generation, the endogenous microbial population in the entire reservoir showed negative growth, the field water content increased rapidly, and the oil displacement efficiency decreased
During the entire activation process, the growth and metabolic activity of endogenous microorganisms in the reservoir is low during the residence period and decay period, and the corresponding oil displacement efficiency is also low, which affects the microbial oil displacement effect

Method used

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  • A method for regulating the growth and metabolism of endogenous microorganisms in oil reservoirs
  • A method for regulating the growth and metabolism of endogenous microorganisms in oil reservoirs
  • A method for regulating the growth and metabolism of endogenous microorganisms in oil reservoirs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] JN in a certain block of Shengli Oilfield 12 The reservoir temperature is 70°C, the porosity is 32.5%, and the average permeability is 1500×10 -3 μm 2 , the viscosity of crude oil is 1256mPa·s, the degree of salinity is 12368mg / L, and the geological reserves are 5.0×10 6 t, the comprehensive water content of the block before the test was 98.5%. Utilize the method of the present invention to implement microbial flooding to improve the crude oil recovery of this block, and the concrete steps are as follows:

[0029] (1) Sampling of test reservoirs

[0030] From test block JN 12 The field samples taken were separated from oil and water to obtain the test block JN 12 Formation water sample 5L.

[0031] (2) Determination of the growth and metabolism of endogenous microorganisms in the oil reservoir

[0032] First screen out the total bacterial concentration after activation is greater than 5.0×10 8 Each / mL activator formula, the test results are shown in Table 1, the...

Embodiment 2

[0058] GM of a block in Shengli Oilfield 21 The reservoir temperature is 75°C, the porosity is 31.5%, and the average permeability is 1200×10 -3 μm 2 , the viscosity of crude oil is 2532mPa·s, the degree of salinity is 9860mg / L, and the geological reserves are 7.8×10 6 t, the comprehensive water content of the block before the test was 99.2%. Utilize the method of the present invention to implement microbial flooding to improve the crude oil recovery of this block, and the concrete steps are as follows:

[0059] (1) Sampling of test reservoirs

[0060] From Trial Block GM 21 The obtained field samples were separated from oil and water to obtain the test block GM 21 Formation water sample 8L.

[0061] (2) Determination of the growth and metabolism of endogenous microorganisms in the oil reservoir

[0062] First screen out the total bacterial concentration after activation is greater than 5.0×10 8 Each / mL activator formula, the test results are shown in Table 5, the scre...

Embodiment 3

[0090] JL in a block of Shengli Oilfield 5 The reservoir temperature is 85°C, the porosity is 33.1%, and the average permeability is 900×10 -3 μm 2 , the viscosity of crude oil is 3212mPa·s, the degree of salinity is 9885mg / L, and the geological reserves are 9.2×10 6 t, the comprehensive water content of the block before the test was 98.7%. Utilize the method of the present invention to implement microbial flooding to improve the crude oil recovery of this block, and the concrete steps are as follows:

[0091] (1) Sampling of test reservoirs

[0092] From test block JL 5 The field samples taken were separated from oil and water to obtain the test block JL 5 Formation water sample 10L.

[0093] (2) Determination of the growth and metabolism of endogenous microorganisms in the oil reservoir

[0094] First screen out the total bacterial concentration after activation is greater than 5.0×10 8 The activator formula per mL, the test results are shown in Table 9. The activato...

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Abstract

The invention belongs to the technical field of microbial oil recovery, and in particular relates to a method for regulating the growth and metabolism rules of endogenous microorganisms in oil reservoirs. The method specifically includes the following steps: sampling the test oil reservoir; determining the growth and metabolism law of the endogenous microorganisms in the oil reservoir; determining the process for increasing the bacteria concentration in the lag period; determining the process for extending the stable period; The present invention has the advantages of clear control thinking, simple process, strong pertinence and operability; at the same time, it has the advantages of good field test effect and high input-output ratio. 12. Therefore, the present invention can be widely used in field tests of microbial oil recovery.

Description

technical field [0001] The invention belongs to the technical field of microbial oil recovery, and in particular relates to a method for regulating the growth and metabolism rules of endogenous microorganisms in oil reservoirs. Background technique [0002] Endogenous microbial flooding is a technology that injects activators into the formation to activate the endogenous microorganisms in the reservoir, and enhances the recovery of crude oil through the interaction of microorganisms and their metabolites with rock and crude oil. The material basis of endogenous microbial flooding is the endogenous microorganisms in the reservoir. The endogenous microorganisms in the reservoir before activation are very low in both bacterial concentration and metabolic activity, which cannot meet the requirements of microbial flooding. The results of laboratory research and field application show that during the injection of activator, the microbial concentration in the oil well produced flui...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22E21B47/00
CPCE21B43/16E21B47/00
Inventor 胡婧郭辽原吴晓玲杨元亮刘廷峰刘方冯云陈琼瑶谭晓明曹嫣镔
Owner CHINA PETROLEUM & CHEM CORP
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