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Method for improving recovery efficiency of oxygen-reduced air flooding of low-permeability oil reservoir

An air flooding and oil recovery technology, which is applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problem of high purification cost, and achieve the effect of improving oil recovery, slowing down oxygen corrosion, and inhibiting adverse effects.

Inactive Publication Date: 2020-02-11
YANGTZE UNIVERSITY +2
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Problems solved by technology

Compared with other non-hydrocarbon gas flooding, this method overcomes the high cost of carbon dioxide flooding source, the high cost of nitrogen purification in nitrogen flooding, and the safety and corrosion problems caused by air flooding due to high oxygen concentration in the injected and produced gas. Low price, high safety and other characteristics, it is a strategic technology with development potential

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  • Method for improving recovery efficiency of oxygen-reduced air flooding of low-permeability oil reservoir
  • Method for improving recovery efficiency of oxygen-reduced air flooding of low-permeability oil reservoir
  • Method for improving recovery efficiency of oxygen-reduced air flooding of low-permeability oil reservoir

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Embodiment Construction

[0048] The present invention will be described in further detail below in conjunction with specific embodiments, so that those skilled in the art can understand.

[0049] Such as figure 1 The method for improving the recovery rate of oxygen-reduced air flooding in low-permeability reservoirs includes the following steps:

[0050] 1) Screening target blocks for oxygen-reducing air flooding

[0051] 1.1 Determine the reservoir parameter set for screening oxygen-reduced air flooding blocks. The method to determine the reservoir parameter set for screening oxygen-reduced air flooding blocks is:

[0052] Based on the analysis of factors affecting the effect of oxygen-reduced air flooding, select the indicators that have a greater impact on oxygen-reduced air flooding from the material base, reservoir characteristics, reservoir characteristics, and development characteristics, and establish a reservoir parameter index set for screening oxygen-reduced air flooding blocks X, there ...

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Abstract

The invention discloses a method for improving the recovery efficiency of oxygen-reduced air flooding of a low-permeability oil reservoir. The method comprises the steps of firstly determining a oil reservoir parameter set of a selected oxygen-reduced air flooding block, determining the adaptability evaluation value of the block to be selected for implementing the oxygen-reduced air flooding according to the weight of the oil reservoir parameters of the selected oxygen-reduced air flooding block and a relative membership degree matrix of candidate oil reservoir selecting indexes, determining the adaptability evaluation value of each block to be selected for implementing the oxygen-reduced air flooding, selecting the block with the highest evaluation value as the optimized implementation block of oxygen-reduced air flooding, and injecting oxygen-reduced air to the optimized oxygen-reduced air flooding oil reservoir. According to the method, after the oxygen-reduced air is dissolved in the oil, the volume of the crude oil is expanded, the oil extraction speed, the oil washing efficiency and the residual oil collection efficiency are favorably improved, the oil displacement effect isimproved, and therefore the oil recovery rate is further improved.

Description

technical field [0001] The invention relates to the field of oil field development, in particular to a method for improving the recovery rate of low-permeability oil reservoirs by reducing oxygen and air flooding. Background technique [0002] At present, most of gas flooding enhanced recovery in mines are carbon dioxide flooding, air flooding and nitrogen flooding. Among them, the source of carbon dioxide drive gas source is insufficient, and there is no source of carbon dioxide drive gas source around most oil reservoirs or the cost of gas source is high; nitrogen drive injection has high purity nitrogen, which requires high nitrogen separation equipment and high cost; air drive has a wide range of gas sources It has the advantages and is widely used in foreign countries, but domestic continental sedimentary reservoirs have serious heterogeneity, and the risk of gas channeling is relatively high. If the direct injection method is used, there are safety and corrosion proble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16E21B43/22
CPCE21B43/16E21B43/168
Inventor 聂法健丁妍毛洪超史宝成王振宇
Owner YANGTZE UNIVERSITY
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