Compound microorganism oil extraction method for low permeability oilfield

A technology of composite microorganisms and composite microorganisms, which is applied in the fields of mining fluids, earthwork drilling, wellbore/well components, etc., can solve the problems of large recoverable oil reserves, increase crude oil production, increase recovery, and increase spillover area effect
CN102852497AInactive Publication Date: 2013-01-02RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
Publication Date
2013-01-02
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a compound microorganism oil extraction method for a low permeability oilfield. The compound microorganism oil extraction method comprises the following steps of (1) cultivating pseudomonas aeruginosa YM4 strains and pseudomonas stutzeri DP1 strains in an indoor shaking flask respectively, and obtaining fermentation broth of high-activity pseudomonas aeruginosa YM4 strains and fermentation broth of polymer produced strains through first-stage and second-stage seeding tank amplification and fermentation production of a production tank; (2) mixing surface active agent produced strains and the pseudomonas stutzeri DP1 strains fermented and produced in the step (1) according to volume ratio of 1:1; and (3) enabling compound microorganism bacterium liquid obtained in the step (2) to serve as an oil-displacing agent to inject in an oil layer directly through a water injection well, and obtaining crude oil from a producing well. The YM4 strains and the DP1 strains are both facultative anaerobic microorganisms and can both grow and breed in a ground layer, polymers produced by the DP1 strains can improve mobility ratio, increases water injection affecting area, and the product surface active agent of the YM4 strains can reduce oil-water interfacial tension and improve oil recovery.
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Description

technical field

[0001] The invention relates to the field of microbial oil recovery, in particular to a low-permeability oilfield composite microbial oil recovery method applicable to low-permeability oilfields. Background technique

[0002] With the rapid development of our country's economy, the demand for oil is increasing day by day, and the shortage of oil is becoming more and more serious. However, the current oil extraction technology can only recover about 1 / 3-1 / 2 of the reserves, and the remaining recoverable oil reserves are huge, especially in low-permeability oil reservoirs. According to statistics, the national low-permeability oil resources are 53.7 billion tons, accounting for 49% of the total resources; low-permeability oilfields are difficult to exploit, which poses great difficulties to the stable production of oilfields. Therefore, how to develop low-permeability oilfields is an urgent problem faced by petroleum workers. question.

[0003] Microbial oil ...

Claims

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