Method for improving oil well yields by means of oil pool indigenous microorganisms

A technology of endogenous microorganisms and microorganisms, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve the problems of affecting the implementation effect, field promotion and application, and poor adaptability of strains, so as to improve the activation effect and on-site test results, strong pertinence, and the effect of saving on-site test costs

Active Publication Date: 2013-09-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology involves issues such as the screening of strains, the production of strains, and the transportation of strains, and the strains screened have poor adaptability to the stratum. Facing the extreme environment of high temperature, high pressure, and high salinity in the stratum, Thus affecting the on-site implementation effect and on-site promotion and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Overview of the test oil well: oil layer thickness of oil well is 3m, oil well temperature is 60℃, pressure is 10MPa, salinity is 12000mg / L, permeability is 300×10 -3 μm 2 , the porosity is 23%, the crude oil viscosity is 300mpa·s, the oil-water well spacing is 100m, and the oil well water saturation is 0.65. The endogenous microbial analysis result is that the microbial concentration of biosurfactant is 10 5 pcs / mL, the concentration of microorganisms producing biogas is 10 2 microbial concentration of 10 cells / mL and producing biopolymers 4 pcs / mL.

[0031] Implement the steps of the present invention:

[0032] (1) Screening of test oil wells, according to the actual parameters of the oil well, and according to the conditions of the test implementation, determine the reservoir conditions that meet the single well huff and puff;

[0033] (2) Analysis of the endogenous microbial community in the test oil well. According to the analysis results, biosurfactant-produc...

Embodiment 2

[0039] Overview of the test oil well: oil layer thickness of oil well 2.4m, oil well temperature 65℃, pressure 10MPa, salinity 20000mg / L, permeability 500×10 -3 μm 2 , the porosity is 15%, the crude oil viscosity is 400mpa·s, the oil-water well spacing is 150m, and the oil well water saturation is 0.55. The result of the analysis is that the concentration of microorganisms producing biosurfactant is 10 2 pcs / mL, the concentration of microorganisms producing biogas is 10 4 microbial concentration of 10 cells / mL and producing biopolymers 4 pcs / mL.

[0040] Implement the steps of the present invention:

[0041] (1) Screening of test oil wells, according to the actual parameters of the oil well, and according to the conditions of the test implementation, determine the reservoir conditions that meet the single well huff and puff;

[0042] (2) Analysis of the endogenous microbial community in the test oil well. According to the analysis results, the gas-producing and polymer-pr...

Embodiment 3

[0048] Overview of the test oil well: oil layer thickness of oil well 4m, oil well temperature 65℃, pressure 12MPa, salinity 15000mg / L, permeability 600×10 -3 μm 2 , the porosity is 21%, the crude oil viscosity is 200mpa s, the oil-water well spacing is 100m, and the oil-well water saturation is 0.6. The result of the analysis is that the concentration of microorganisms producing biosurfactant is 10 5 pcs / mL, the concentration of microorganisms producing biogas is 10 2 microbial concentration of 10 cells / mL and producing biopolymers 4 pcs / mL.

[0049] Implement the steps of the present invention:

[0050] (1) Screening of test oil wells, according to the actual parameters of the oil well, and according to the conditions of the test implementation, determine the reservoir conditions that meet the single well huff and puff;

[0051] (2) Analysis of the endogenous microbial community in the test oil well. According to the analysis results, surfactant-producing and gas-produc...

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Abstract

The invention relates to a microorganism enhanced oil recovery method, in particular to a method for improving oil well yields by means of oil pool indigenous microorganisms. The method includes the following steps of (1) screening of a test oil well, (2) screening of activating agents, (3) confirming of the injection rate of the activating agents, (4) confirming of well closing time and (5) on-site testing. By means of the indigenous microorganisms existing in the activated oil well, on-site test cost is thereby saved, different formulas of the activating agents are chosen according to the different indigenous microorganisms, activating effects and on-site test effects are effectively improved, the stratum cannot be damaged and the environment cannot be polluted when nutrient substances are injected, and therefore the method can be widely used for microorganism enhanced oil recovery.

Description

technical field [0001] The invention relates to a microbial oil recovery method, in particular to a method for improving oil well production by utilizing endogenous microorganisms in oil reservoirs. Background technique [0002] Microbial oil recovery refers to the comprehensive action of microorganisms and their metabolites (biosurfactants, biopolymers, biogas), reservoir rocks and fluids to improve the fluid mobility ratio, so as to achieve the purpose of enhancing oil recovery. Microbial oil recovery technology has the advantages of low investment cost, no environmental pollution and wide range of reservoir adaptation, so it has broad field application prospects. [0003] Microbial oil recovery technology mainly includes microbial flooding for enhanced oil recovery and microbial single-well treatment for oil recovery. Microbial single-well huff and puff refers to injecting and screening specific bacteria into production wells. Through the action of bacteria itself and it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C09K8/58
Inventor 汪卫东刘涛徐鹏李彩风王静郝滨宋欣王刚徐闯徐登霆张守献宋永亭曹嫣镔
Owner CHINA PETROLEUM & CHEM CORP
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