Proteus for reducing fe(iii) in clay minerals and its application to inhibit clay swelling

Abstract

The invention provides a proteus for reducing Fe(III) in clay minerals and its application for inhibiting clay swelling. The preservation number of the Proteus of the present invention is CGMCC No.15331. This bacterial strain has iron reduction activity, facultative anaerobic, and widely used electron donors, and can efficiently reduce Fe(III) in iron citrate and montmorillonite. Not only can it be used for the dissolution of clay minerals in low-permeability oil reservoirs, but it can also reduce the ferric ions in easily hydratable clay minerals in oil reservoirs through the strain itself and its metabolites to change the crystal structure and phase transformation So as to achieve the purpose of increasing permeability and channel drag reduction to enhance oil recovery.

Description

technical field [0001] The present invention relates to a kind of proteus and its application of inhibiting clay swelling, in particular to a kind of proteus which produces acid and gas and efficiently reduces Fe(III) in clay minerals, and the bacteria can reduce ferric citrate and montmorillonite The application of Fe(III) in rock minerals and inhibition of clay expansion belongs to the application of bioengineering technology in microbial dissolution of minerals, involving the dissolution of clay minerals in oil reservoirs, inhibition of hydration expansion of clay minerals and improvement of reservoirs Seepage and channel drag reduction technology field. Background technique [0002] Iron is the most abundant element on the earth and the fourth most abundant element in the crust. It is widely distributed in the surface sedimentary environment with Fe(II) and Fe(III) as the main valence states. According to statistics, the average content of iron in the depositional envir...

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Problems solved by technology

However, these strains with iron reduction activity still have the following defects: 1) most strains can only survive in a strict anaerobic environment, which is not conducive to large-scale production and practical application; Use small molecular weight organic substances such as acetic acid and lactic acid as electron donors, and cannot use organic substances with large molecular weight such as glucose and sucrose, so the environmental requirements for practical applications are relatively high

For example, CN101096645A discloses a strain of Enterobacter aerogenes and its application. This bacterium only performs Fe(III) reduction of iron-rich minerals under normal temperature (30°C) and strict anaerobic conditions, and the reduction rate is low. Efficient reduction of Fe(III) in clay minerals under high temperature, facultative anaerobic conditions without bioorganic acid production

CN104974964A discloses a dissimilatory iron-reducing bacterium and its application. Although the bacterium can reduce Fe(III) in montmorillonite at normal temperature (30° C.) and under strict anaerobic conditions, the reduction rate is only 16.25% and requires The reduction reaction can be achieved in 30 days in the presence of the addition of iron reduction catalyst (AQDS).

[0005] Proteus is a ubiquitous strain in nature, but so far no acid-producing and aerogenic Proteus with iron-reducing activity has been reported

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