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Microbial oil recovery method

A microbial oil recovery and oil reservoir technology, applied in the direction of microorganism-based methods, microorganisms, biochemical equipment and methods, etc., can solve problems such as addition, difficulty in system control operation, direct separation of gas and liquid phases, etc.

Inactive Publication Date: 2011-10-12
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The direct injection of air will cause the direct separation of gas phase and liquid phase, making it more difficult to control the operation of the system.
USP6546962 proposes a method of dissolving air into water by jet flow to increase the concentration of dissolved oxygen. This method overcomes the problems caused by direct injection of air, but there are also problems such as adding injection equipment and regulating pressure.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1, microbial oil recovery of the present invention and its effect monitoring

[0024] 1. Microbial oil recovery

[0025] Carry out simulated oil displacement experiments under simulated reservoir conditions of artificial or natural cores to determine the optimal dissolved oxygen content of the injection fluid and the dosage of mixed bacteria for petroleum hydrocarbon degradation, providing reference for field applications. The steps for field application are as follows:

[0026] 1. Select a water injection block test suitable for microbial flooding. The reservoir conditions of this block are as follows, the buried depth of the reservoir is 500-3000m; temperature0.1μm 2 of oil reservoirs.

[0027] 2, to the nutrient solution (solvent is water, solute is the molasses of 30g / L, the urea of ​​10g / L, the diammonium hydrogen phosphate of 8g / L, 0.2g to the nutrient solution of the petroleum hydrocarbon degrading bacteria in storage tank (pressure can reach 2MPa) ...

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PUM

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Abstract

The invention discloses a microbial oil recovery method. By the method, the crude oil production rate of a field test is improved by 12.5 percent. The microbial oil recovery method provided by the invention comprises the following steps of: 1) carrying out pure oxygen aeration on a culture solution of petroleum hydrocarbon degrading bacteria to obtain an injection solution which is subjected to the pure oxygen aeration; 2) mixing the injection solution which is subjected to the pure oxygen aeration in the step 1) and a bacteria solution which contains the petroleum hydrocarbon degrading bacteria to obtain a mixed solution; and 3) injecting the mixed solution which is obtained in the step 2) into an oil reservoir by a production well for oil recovery to obtain crude oil. The content of dissolved oxygen in the injection solution is increased in a mode of carrying out pure oxygen aeration on the injection solution in a storage tank, so the activity of aerobic and / or facultative microbes can be effectively improved, life activity such as growth metabolism of the aerobic and / or facultative microbes is quickened, the degree of hydrocarbon degradation is improved, and the crude oil production can be improved.

Description

technical field [0001] The invention relates to the technical field of microbial oil recovery. Background technique [0002] Microbial oil recovery was first proposed and studied by scholars from the former Soviet Union and the United States. It refers to injecting the microbial liquid and nutrient solution isolated and cultivated on the ground into the oil layer, or simply injecting the nutrient solution or the microorganisms in the oil layer, so that they can grow and reproduce in the oil layer, and produce metabolites that are conducive to improving the recovery rate, so as to improve oilfield oil production efficiency. Oil recovery method, also known as microbial enhanced oil recovery (Microbial Enhanced Oil Recovery). Because of its low cost, good effect and no pollution, it has been paid more and more attention by people. [0003] At present, the biochemical mechanism of microbial oil recovery recognized at home and abroad has two aspects. One is the role of microorg...

Claims

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Application Information

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IPC IPC(8): E21B43/22C09K8/582C12N1/20C12R1/38C12R1/085C12R1/01C12R1/06C12R1/64C12R1/15
Inventor 吴晓磊汤岳琴郭鹏池昌桥
Owner PEKING UNIV
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