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Endogenous and exogenous functional microorganism composite huff and puff method

A functional microorganism and microbial technology, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve the problems of reducing the efficiency of microbial crude oil and affecting the effect of microbial field tests, so as to improve the effective utilization rate and improve the field efficiency. The effect of the experiment and the effect of improving the population structure

Inactive Publication Date: 2020-05-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, exogenous functional microorganisms are usually directly injected into the formation. Due to the retention and limited migration ability of microorganisms in the reservoir, most of the exogenous functional microorganisms are enriched and reproduced in the formation with low oil saturation near the oil well. It is difficult for microorganisms with source function to reach the deep part of the formation and cannot fully contact with the remaining oil with high oil saturation in the deep part, which greatly reduces the efficiency of microbial crude oil action and affects the field test effect of microbial single well huff and puff

Method used

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  • Endogenous and exogenous functional microorganism composite huff and puff method
  • Endogenous and exogenous functional microorganism composite huff and puff method

Examples

Experimental program
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Effect test

Embodiment 1

[0057] A high water cut oil well F in Shengli Oilfield 1 , crude oil viscosity 1182mPa.s, reservoir temperature 70°C, reservoir pressure 11.30MPa, water cut>88.0%, effective reservoir thickness 10.5m, porosity 0.45, permeability 910×10 -3 μm 2 , the formation water salinity is 3612mg / L, the daily liquid before implementation is 5.2t / d, and the daily oil is 0.5t / d. Implement the steps of the present invention as follows:

[0058] (1) Screening of test wells

[0059] The temperature of the test oil well is 70°C, the viscosity of formation crude oil is 1182mPa.s, the salinity of formation water is 3612mg / L, and the permeability is 910×10 -3 μm 2 , biopolymer-producing microorganism Sphingomonas 1.0×10 exists in the formation water 2 Individuals / ml and biosurfactant microorganism Geobacillus 2.0×10 2 individual / ml, lack of biogas-producing microorganisms. Oil well screening range consistent with the present invention.

[0060] (2) Screening of endogenous functional microbi...

Embodiment 2

[0099] An oil well H in Shengli Oilfield 2 , the crude oil viscosity is 819mPa.s, the reservoir temperature is 50℃, the reservoir pressure is 11.07MPa, the water content is 97.2%, the effective thickness of the reservoir is 3.8m, the porosity is 0.22, and the permeability is 1230×10 -3 μm 2 , the formation water salinity is 13252mg / L, the daily liquid before implementation is 3.2t / d, and the daily oil is 0.1t / d. Implement the steps of the present invention as follows:

[0100] (1) Screening of oil wells

[0101] Test well H 2 The temperature is 50°C, the viscosity of formation crude oil is 819mPa.s, the salinity of formation water is 13252mg / L, and the permeability is 1230×10 -3 μm 2 , there are biopolymer-producing microorganisms Alcaligenes and aerogenous microorganisms methanogens, and there is a lack of biosurfactant-producing microorganisms. Meet the screening criteria of the oil well of the present invention.

[0102] (2) Screening of endogenous functional microbi...

Embodiment 3

[0141] A low-efficiency oil well G in Shengli Oilfield 1 , the crude oil viscosity is 1663mPa.s, the reservoir temperature is 60℃, the reservoir pressure is 10.07MPa, the water content is 96.8%, the effective thickness of the reservoir is 6.2m, the porosity is 0.30, and the permeability is 680×10 -3 μm 2 , the formation water salinity is 4327mg / L, the daily liquid before implementation is 4.2t / d, and the daily oil is 0.14t / d. Implement the steps of the present invention as follows:

[0142] (1) Screening of test wells

[0143] Test well G 1 The temperature is 60°C, the viscosity of formation crude oil is 1663mPa.s, the salinity of formation water is 4327mg / L, and the permeability is 680×10 -3 μm 2 , biosurfactant-producing microorganism Geobacillus 3.0×10 exists in the formation water 2 / ml and gas-producing microorganism hydrogen-producing bacteria 1.0×10 2 individuals / ml, lacking biopolymer-producing microorganisms. Meet the screening criteria of the oil well of the ...

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Abstract

The invention belongs to the technical field of tertiary recovery, and particularly relates to an endogenous and exogenous functional microorganism composite huff and puff method. The method comprisesthe following steps that a testing oil well is screened; an endogenous functional microorganism activator system is screened; an exogenous functional microorganism is screened; an exogenous functional microorganism sustained-release system is prepared; an on-site injection process is determined; and an on-site experiment is carried out, and the effect of the on-site experiment is evaluated. The implementation process is simple, the method is highly targeted, and the reliability is high; and meanwhile, the investment cost is low, the effect lasting time is long and exceeds 24 months, the effect of the on-site experiment is good, and the average daily oil increment of a single well exceeds 5 t. Therefore, the method can be widely used in a microbial single well huff and puff processing technology.

Description

technical field [0001] The invention belongs to the technical field of tertiary oil recovery, and in particular relates to a method for composite huffing and puffing of exogenous and exogenous functional microorganisms. Background technique [0002] As an environmentally friendly and sustainable oil recovery technology, microbial single well huff and puff has become an effective method to improve oil well productivity. It refers to directly injecting an activator system or microorganisms into low-efficiency oil well formations, and using the growth and metabolism activities of microorganisms in the reservoir environment to enhance the mobility of crude oil and increase the production of oil wells. Previous studies have found that in some low-efficiency oil wells, there is a lack of microorganisms with oil displacement function or the microorganisms with oil displacement function are difficult to be effectively and directionally activated. Therefore, it is difficult to effect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C12N1/20C12N1/16
CPCC12N1/16C12N1/20E21B43/16
Inventor 李彩风宋永亭曹嫣镔林军章宋敏赵凤敏冯云巴燕尹德江张吉星
Owner CHINA PETROLEUM & CHEM CORP
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