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Indigenous microorganism single well huff-puff oil production method

A technology of endogenous microorganisms and oil wells, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problem of not being able to effectively improve the single well production of heavy oil reservoirs, single activator injection process, and unable to achieve classified activation and other problems, to achieve the effect of improving the activation effect and field test effect, strong operability, and good field test effect

Inactive Publication Date: 2017-07-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: (1) the adaptable range of the oil reservoir is small, 30°C<reservoir temperature<80°C, formation water salinity<80000mg / L, crude oil viscosity range 10~1000mPa·s, and for temperature greater than 80 ℃, formation water salinity greater than 80000mg / L and crude oil viscosity greater than 1000mPa·s are not suitable for this method; Any one or more of the microorganisms cannot effectively increase the single well production of heavy oil reservoirs; (3) The activator injection process of the three types of functional bacteria (biosurfactant-producing, biogas-producing and biopolymer-producing bacteria) is relatively simple , can not achieve classification activation, so it affects the field test effect to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Test well H 12 Overview: Reservoir temperature is 65°C, formation water salinity is 16532mg / L, permeability is 550×10 -3 μm 2 , crude oil viscosity 1258mPa.s, water content 95.3%, oil layer thickness 4.5m, daily oil production of the oil well before the test was 3.2t; endogenous microbial analysis results showed that the concentration of Pseudomonas bacteria was 1.0×10 3 Individual / mL, the concentration of Geobacillus is 1.1×10 3 individual / mL, the concentration of methanogenic bacteria is 5.0×10 2 individual / mL. Implement the concrete steps of the present invention in this well:

[0033] (1) Screening of test wells

[0034] Test well H 12 The reservoir temperature is 65°C, the formation water salinity is 16532mg / L, and the permeability is 550×10 -3 μm 2 , crude oil viscosity 1258mPa.s, water content 95.3%, oil layer thickness 4.5m; endogenous microbial analysis results showed that the concentration of Pseudomonas was 1.0×10 3 Individual / mL, the concentration o...

Embodiment 2

[0048] Test well H 15 Overview: Reservoir temperature is 72°C, formation water salinity is 21320mg / L, permeability is 900×10 -3 μm 2 , crude oil viscosity 1865mPa.s, water content 92.5%, oil layer thickness 6.0m, daily oil production of the oil well before the test was 4.3t; endogenous microbial analysis results showed that the concentration of Pseudomonas bacteria was 2.0×10 3 Individual / mL, the concentration of Geobacillus is 1.0×10 3 individual / mL, the concentration of Aerobacter aerogenes is 2.0×10 3 individual / mL. Implement the concrete steps of the present invention in this well:

[0049] (1) Screening of test wells

[0050] Test well H 15 The reservoir temperature is 72°C, the formation water salinity is 21320mg / L, and the permeability is 900×10 -3 μm 2 , crude oil viscosity 1865mPa.s, water content 92.5%, oil layer thickness 6.0m; endogenous microbial analysis results showed that the concentration of Pseudomonas was 2.0×10 3 Individual / mL, the concentration of...

Embodiment 3

[0064] Test well H 32 Overview: Reservoir temperature is 80°C, formation water salinity is 35856mg / L, permeability is 1200×10 -3 μm 2 , crude oil viscosity 2560mPa.s, water content 96.5%, oil layer thickness 4.0m, daily oil production of the oil well before the test was 2.8t; endogenous microbial analysis results showed that the concentration of Acinetobacter bacteria was 1.1×10 3 Individual / mL, the concentration of Bacillus subtilis is 3.0×10 3 individual / mL, the concentration of Aerobacter aerogenes is 2.0×10 2 individual / mL. Implement the concrete steps of the present invention in this well:

[0065] (1) Screening of test wells

[0066] Test well H 32 The reservoir temperature is 80°C, the formation water salinity is 35856mg / L, and the permeability is 1200×10 -3 μm 2 , crude oil viscosity 2560mPa.s, water content 96.5%, oil layer thickness 4.0m; endogenous microbial analysis results showed that the concentration of Acinetobacter was 1.1×10 3 Individual / mL, the conc...

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Abstract

The invention belongs to the technical field of microorganism oil production and particularly relates to an indigenous microorganism single well huff-puff oil production method. The indigenous microorganism single well huff-puff oil production method comprises the following steps of test oil well screening, a hydrocarbon oxidizing functional bacteria activation huff-puff test, a crude oil emulsification functional bacteria activation huff-puff test, a gas producing functional bacteria activation huff-puff test, a field test and testing effect evaluation. According to the indigenous microorganism single well huff-puff oil production method, hydrocarbon oxidizing functional bacteria, crude oil emulsification functional bacteria and gas producing functional bacteria in an activation test oil well are utilized, and the purpose of effectively increasing the oil well yield is achieved through the comprehensive effect of metabolic products of the bacteria. The indigenous microorganism single well huff-puff oil production method has the characteristics of being simple in process, high in pertinence and operability and good in field test effect; the effective period is longer than 24 months; the single well average daily incremental oil is greater than 3t; and the input-output ratio is greater than 1:4.5. Therefore, the indigenous microorganism single well huff-puff oil production method can be widely used in field tests for increasing the oil well yield.

Description

technical field [0001] The invention relates to a microbial oil recovery method, in particular to a method for endogenous microbial single well huff and puff oil recovery. Background technique [0002] Microbial single well huff and puff refers to the injection and screening of specific bacteria or activators in the production well. Through the action of the bacteria themselves and their metabolites, the wellbore and near-well formations are treated to improve the physical properties of crude oil, reduce the flow resistance of crude oil, and increase the production of oil wells. . Microbial single well huff and puff has the characteristics of less ground investment, simple operation, and quick results. It can especially improve the physical properties of crude oil, reduce the flow resistance of crude oil, and improve the efficiency of crude oil production in the wellbore of oil wells and near wells. [0003] In the prior art, the patent titled "microbial single well huff an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22
CPCE21B43/16
Inventor 孙刚正胡婧吴晓玲汪刚跃高光军赵凤敏宋永亭曹功泽冯云刘涛
Owner CHINA PETROLEUM & CHEM CORP
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