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Microorganism circulating oil recovery method adopting mode of continuously filling low-concentration nutrient solution

An oil displacement method and nutrient solution technology, which are applied in earthwork drilling, production fluid, wellbore/well components, etc., can solve the problems of unsatisfactory microbial oil displacement effect and discontinuous injection of nutrient solution, and overcome the problem of uneven nutrient concentration. Continuity, Enhanced Oil Recovery, Enhanced Oil Recovery Effect

Active Publication Date: 2013-03-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Overcome the discontinuity of nutrient solution injection in the current on-site microbial flooding process, resulting in unsatisfactory microbial flooding effects

Method used

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  • Microorganism circulating oil recovery method adopting mode of continuously filling low-concentration nutrient solution
  • Microorganism circulating oil recovery method adopting mode of continuously filling low-concentration nutrient solution
  • Microorganism circulating oil recovery method adopting mode of continuously filling low-concentration nutrient solution

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Embodiment 1

[0017] Embodiment 1: Taking the microbial circulation flooding method of continuously injecting low-concentration nutrient solution into Well Ba51-25 of Baolige Oilfield as an example, the present invention will be further described in detail.

[0018] Step A, the concentration of bacteria injected from the Ba 51-25 water injection well is 10 6 Each / mL of exogenous microbial bacterial solution and 1.0% nutrient solution slug 900m 3 , to make the target bacteria grow and reproduce in large quantities in the oil reservoir. The exogenous microorganisms injected are Bacillus subtilis (Bacillus subtilis) CGMCC 1.400 and Pseudomonas putida (Pseudomonas putida) CGMCC 1.1130, and the bacterial solution is Bacillus subtilis and putida The ratio of spores to bacteria is 1:1; the injected nutrient solution is 0.6% glucose, 0.1% peptone, 0.08% yeast extract, 0.1% ammonium chloride, 0.1% disodium hydrogen phosphate, 0.02% potassium dihydrogen phosphate, and formation water Preparation, th...

Embodiment 2

[0022] Example 2: Taking Bar 51-41 as an example to illustrate the oil displacement process of continuous injection of low-concentration nutrient solution to activate endogenous microorganisms

[0023] Step A, inject 1.2% nutrient solution slug 1200m from Ba 51-41 water injection well 3 To activate the endogenous microorganisms in the reservoir, the nutrient solution injected was 0.8% glucose, 0.1% peptone, 0.08% yeast extract, 0.12% ammonium chloride, 0.08% disodium hydrogen phosphate, 0.02% potassium dihydrogen phosphate, and Prepared with water, the total concentration is 1.0%. The injection speed is 30m 3 / day, followed by water flooding.

[0024] Step B, carry out the bacterial concentration and nutrient solution concentration in the output fluid of 5 oil wells corresponding to Bar 51-41, Bar 51-42, Bar 51-43, Bar 51-59, Bar 51-63 and Bar 51-71 Tracking and monitoring, it was found that the total number of bacteria in the continuous monitoring for 3 months was 5×10 6 ...

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Abstract

The invention relates to a microorganism circulating oil recovery method adopting a mode of continuously filling low-concentration nutrient solution, and is applied to microbial enhanced oil recovery for oil fields. Firstly, the number of microorganisms in the stratum reaches 105 to 107 pieces / mL by filling high-concentration bacteria solution and / or nutrient solution into a target oil reservoir so as to establish an oil reservoir microorganism field; and then the growth and propagation of the microorganisms in the stratum are kept by continuously filling the low-concentration nutrient solution with the concentration of 0.2 percent so as to fulfill the aim of sustained action of the microorganisms and metabolic products thereof on crude oil in the oil reservoir, prolong the period of validity of microorganism oil recovery and improve the input-output ratio. Field application shows that the adoption of the mode of continuously filling low-concentration nutrient solution with the concentration of 0.2 percent can effectively promote the growth and propagation of the microorganisms and avoid large fluctuation of the number of the microorganisms, which is caused by a slug filling mode; and according to the method, under the condition that the cost is not increased, the recovery ratio is improved by 7.0 percent.

Description

technical field [0001] The invention relates to the technical field of oil recovery in oil fields, in particular to a microbial oil recovery method, in particular to a microbial circulation oil displacement method using continuous injection of low-concentration nutrient solution under the condition of a stable microbial field. Background technique [0002] Microbial water flooding is the most effective and widely used microbial enhanced oil recovery method. Microbial oil recovery technology is to inject the screened microbial strains and nutrient solution into the oil reservoir together, or inject the activator to activate the endogenous microorganisms in the oil reservoir, and use the beneficial activities of microorganisms in the oil reservoir and their metabolites to interact with the liquid in the oil reservoir. The interaction between phase and solid phase improves the flow properties of crude oil, thereby enhancing the comprehensive technology of oil recovery. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22
Inventor 柯从玉吴刚游靖谷溢李青朱立国李勇斌牟伯中
Owner PETROCHINA CO LTD
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