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A Method of Improving the Adaptability of Exogenous Functional Microbial Reservoirs

A technology for functional microorganisms and reservoir adaptability, which is applied in the field of improving the adaptability of exogenous functional microorganisms to reservoirs, can solve the problems of only focusing on temperature or salinity and not being able to adapt, achieving good results, improving utilization, and simple methods Effect

Active Publication Date: 2019-08-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing related technologies only screen or domesticate a certain characteristic of exogenous bacteria, for example, only focus on temperature or salinity, while ignoring the influence of other factors, resulting in bacteria that can adapt to the temperature of the reservoir, but Cannot adapt to other environmental factors such as high pressure and anaerobic conditions of the reservoir

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] An oil reservoir A in Shengli Oilfield, the reservoir temperature is 62°C, the salinity is 27000mg / L, the reservoir depth is 1450 meters, the formation pressure is 10.0MPa, and the permeability is 1100×10 -3 μm 2 , crude oil viscosity 3600mPa.s, pore volume 7.5×10 4 m 3 , geological reserves 3.5×10 4 t, the average water cut of the oil well is 89.3%. The method of the invention is used to screen and domesticate exogenous functional microorganisms suitable for the oil reservoir. Specific steps are as follows:

[0033] (1) Preliminary screening of exogenous functional microorganisms

[0034] According to the conditions of the temperature of 62°C and the salinity of 27000mg / L in the test reservoir A, a Bacillus strain producing emulsifier was preliminarily screened out. / L.

[0035](2) Adaptive domestication of exogenous functional microbial reservoirs

[0036] ① Acclimatization of reservoir temperature

[0037] The domestication of oil reservoir temperature, conc...

Embodiment 2

[0052] Reservoir B in Shengli Oilfield, reservoir temperature 65℃, salinity 15200mg / L, reservoir depth 1250m, formation pressure 11.2MPa, permeability 750×10 -3 μm 2 , crude oil viscosity 5865mPa.s, pore volume 1.2×10 5 m 3 , geological reserves 5.0×10 5 t, the average water cut of the oil well is 95.2%. The method of the invention is used to screen and domesticate exogenous functional microorganisms suitable for the oil reservoir. Specific steps are as follows:

[0053] (1) Preliminary screening of exogenous functional microorganisms

[0054] According to the conditions of temperature 65℃ and salinity of 15200mg / L in the test reservoir B, a strain of Bacillus subtilis producing biosurfactant was preliminarily screened out. ~35000mg / L.

[0055] (2) Adaptive domestication of exogenous functional microbial reservoirs

[0056] ① Acclimatization of reservoir temperature

[0057] The domestication of oil reservoir temperature, concrete steps are as follows: above-mentioned...

Embodiment 3

[0072] Reservoir C in Shengli Oilfield, reservoir temperature 55℃, salinity 18560mg / L, reservoir depth 2560m, formation pressure 12.3MPa, permeability 900×10 -3 μm 2 , crude oil viscosity 2565mPa.s, pore volume 9.0×10 4 m 3 , geological reserves 5.5×10 4 t, the average water cut of the oil well is 97.2%. The method of the invention is used to screen and domesticate exogenous functional microorganisms suitable for the oil reservoir. Specific steps are as follows:

[0073] (1) Preliminary screening of exogenous functional microorganisms

[0074] According to the condition of temperature 55℃ and salinity of 18560mg / L in the test reservoir C, a Bacillus strain producing emulsifier was preliminarily screened. / L.

[0075] (2) Adaptive domestication of exogenous functional microbial reservoirs

[0076] ① Acclimatization of reservoir temperature

[0077] The domestication of oil reservoir temperature, concrete steps are as follows: above-mentioned bacillus is inoculated in t...

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Abstract

The invention belongs to the technical field of petroleum exploitation, and particularly relates to a method for improving oil reservoir adaptability of exogenous functional microorganisms. The methodspecifically comprises the following steps that preliminary screening of the exogenous functional microorganisms is conducted, specifically, the exogenous functional microorganisms are preliminarilyscreened according to oil reservoir conditions of a testing oil reservoir; acclimation of the exogenous functional microorganisms is conducted, and acclimation comprises four respects of oil reservoirtemperature acclimation, oil reservoir mineralization acclimation, oil reservoir anaerobic condition acclimation and oil reservoir pressure acclimation; oil reservoir adaptability evaluation of the exogenous functional microorganisms after being subjected to acclimation is conducted, specifically, a physical simulation oil displacement experiment is conducted under the oil reservoir condition ofsimulating a test oil reservoir, the oil reservoir adaptability of the exogenous functional microorganisms after being subjected to acclimation is evaluated, and the exogenous functional microorganisms are screened for a field test; and the field test is conducted, and evaluation on the field test effect is conducted after the test is finished. The method for improving the oil reservoir adaptability of the exogenous functional microorganisms has the characteristics that the method is simple, maneuverability and pertinence are high, the cost is low, the oil reservoir adaptability of the exogenous functional microorganisms after being subjected to acclimation is high, and the field test effect is good, and enhanced oil recovery of the field test is greater than 10%.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a method for improving the adaptability of exogenous functional microbial oil reservoirs. Background technique [0002] Microbial oil recovery technology refers to injecting specific microorganisms and nutrients into the oil reservoir, and then using the growth and metabolism of microorganisms to act on the reservoir and crude oil, so as to achieve the purpose of increasing crude oil production. This technology has the advantages of simple construction, low investment and quick results. And the characteristics of not damaging the reservoir, therefore, this technology has a large number of applications in oilfields at home and abroad, and has achieved a good increase in oil production. [0003] Microbial flooding can be divided into two types: exogenous microbial oil flooding and endogenous microbial oil flooding according to the source of bacteria speci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22
CPCE21B43/16
Inventor 宋永亭林军章徐福刚段传慧谭晓明冯云宋欣王静刘涛丁明山巴燕
Owner CHINA PETROLEUM & CHEM CORP
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