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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

Inactive Publication Date: 2013-01-02
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Compound microorganism oil extraction method for low permeability oilfield
  • Compound microorganism oil extraction method for low permeability oilfield
  • Compound microorganism oil extraction method for low permeability oilfield

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for composite microbial oil recovery in low-permeability oilfields, characterized in that the method comprises the following steps: 1) Surfactant-producing strains and polymer-producing strains are respectively cultured in shake flasks indoors, and amplified by primary and secondary seed tanks And production tank fermentation production, obtain the fermented liquid of the highly active surfactant-producing strain and the fermented liquid of producing the polymer strain;

[0031] 2) Mix the fermentation liquid of the surfactant-producing strain and the polymer-producing strain produced by fermentation in step 1) in a volume ratio of 1:1 to obtain a mixed liquid, that is, a composite microbial bacterial liquid;

[0032] 3) The composite microbial bacterial liquid obtained in step 2) is directly injected into the oil layer through the water injection well as an oil displacement agent, and crude oil is obtained from the production well.

Embodiment 2

[0034] 1. The method comprises the following steps:

[0035] 1) Surfactant-producing strains and polymer-producing strains are respectively cultivated in indoor shake flasks, first-level and second-level seed tanks are enlarged, and production tanks are fermented to obtain high-activity fermented surfactant-producing strains and Fermentation broth of polymer-producing strains;

[0036] 2) Mix the fermentation liquid of the surfactant-producing strain and the polymer-producing strain produced by fermentation in step 1) in a volume ratio of 1:1 to obtain a mixed liquid, that is, a composite microbial bacterial liquid;

[0037] 3) The composite microbial bacterial liquid obtained in step 2) is directly injected into the oil layer through the water injection well as an oil displacement agent, and crude oil is obtained from the production well.

[0038] The surfactant-producing strain is Pseudomonas aeruginosa YM4 (Pseudomonas aeruginosa), and its metabolite is a rhamnose surfacta...

Embodiment 3

[0063] The present invention is applied on-site in the Yuanmao test area of ​​Wayaobao Oil Production Plant of Yanchang Petroleum. The microbial oil displacement test of 10 injections and 32 extractions has been carried out. The method of injecting water injection wells has been adopted. Since the field test, the injection pressure has decreased, and the average injection pressure From 5.1MPa to 4.6Mpa, the depressurization range reaches 10%. The production of oil wells increased steadily. A total of 17 oil wells in the test area saw obvious oil increase effects, and the average daily oil production of a single well in the test well group increased by more than 20%.

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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.

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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Application Information

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IPC IPC(8): E21B43/22
Inventor 王香增高瑞民李世强江绍静洪玲赵丽薛媛王蓓蕾冯跃
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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