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Combined typed method of edge-water encroachment of microbe

A technology of microbial oil flooding and microbial flooding, which is used in earth-moving drilling, fluid production, wellbore/well components, etc., can solve the problems of inability to reflect, low degree of water washing, waste of injected microorganisms and nutrient resources, etc. Oil efficiency, improve oil displacement performance, reduce loss effect

Inactive Publication Date: 2007-05-30
DAQING HUALI ENERGY BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the injected microorganisms and nutrient solutions cannot effectively reach the middle and low permeability layer with low water washing degree and rich remaining oil, and cannot contact the crude oil there, the oil displacement effect cannot be exerted, resulting in waste of injected microorganisms and nutrient resources
In addition, the original microorganisms distributed in the middle and low permeability layers cannot greatly improve their activity because they do not receive enough nutrition, and the resources of the original microorganisms in the oil reservoir that are beneficial to the enhanced oil recovery cannot be effectively utilized. In addition, studies have shown that the injected microorganisms and the reservoir's original microorganisms have a synergistic effect, which can further enhance oil recovery. Since the original microorganisms cannot be activated on a large scale, the synergistic effect of enhancing oil recovery cannot be reflected.
This is the main drawback of the existing mine test technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Artificial heterogeneous cores were used to carry out experimental simulations. Core A was directly subjected to microbial flooding using the prior art, and core B was pretreated using the technology of the present invention before microbial flooding. The effect of microbial flooding of the method of the present invention and the method of the prior art is compared. details as follows:

[0020] Artificial heterogeneous cores A and B, the water phase permeability is 0.8μm 2 , the displacement water is sterilized injection water from an oilfield, and the displacement speed is 4m / d. The core is saturated with water, crude oil is displaced to irreducible water saturation, injected water is displaced to residual oil saturation, and then the following treatments are performed respectively:

[0021] Core A:

[0022] Inject Bacillus subtilis (B.subtilis, CGMCC1.400) fermentation broth with 4.0% pore volume of the core (diluted to a volume concentration of 5% with nutrient so...

Embodiment 2

[0027] Artificial heterogeneous cores were used to carry out experimental simulations. Core C was directly subjected to microbial flooding using the prior art, and core D was pretreated using the technology of the present invention before microbial flooding. The effect of microbial flooding of the method of the present invention and the method of the prior art is compared. details as follows:

[0028] Artificial heterogeneous cores C and D, the water phase permeability is 0.8μm 2 , the displacement water is sterilized injection water from an oilfield, and the displacement speed is 4m / d. The core is saturated with water, crude oil is displaced to irreducible water saturation, injected water is displaced to residual oil saturation, and then the following treatments are performed respectively:

[0029] Core C:

[0030] Inject Pseudomonas aeruginosa (P.aeruginosa, CGMCC1.1785) fermentation broth with 1.0% of core pore volume (diluted to 5% volume concentration with nutrient sol...

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Abstract

A combined microne method for displacing oil includes microbillary, chemically or physical pretreating the non-uniform oil deposit and microbillary displacing oil. Its advantages are high utilization rate of nutrients and microbes, and fully playing the role of microbes in displacing oil.

Description

technical field [0001] The invention relates to an oilfield exploitation method, in particular to a technical method for improving crude oil recovery by microorganisms in the oilfield exploitation method. Background technique [0002] Due to the complex geological conditions of continental reservoirs in my country, nearly two-thirds of the crude oil remains underground after water flooding, the recovery rate of crude oil in oilfields is generally low, and the difficulty of replacing reserves and other severe situations, there is an urgent need to research and develop efficient, adaptable To meet the society's demand for energy with highly innovative enhanced oil recovery technology. [0003] Studies have shown that microbial oil flooding is a technology with a wide range of adaptability and potential for enhancing oil recovery, and has broad application prospects. This technology enhances oil recovery through the beneficial activities of microorganisms (degradation of crude ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22
Inventor 刘金峰牟伯中
Owner DAQING HUALI ENERGY BIOLOGICAL TECH