A method for composite microbial oil recovery in low permeability oilfields

A technology of compound microorganisms and compound microorganisms, which is applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of large recoverable oil reserves, etc., to increase crude oil production, reduce surface and interfacial tension, and increase sweeping area effect

Inactive Publication Date: 2015-09-30
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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  • A method for composite microbial oil recovery in low permeability oilfields
  • A method for composite microbial oil recovery in low permeability oilfields
  • A method for composite microbial oil recovery in low permeability oilfields

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A low-permeability oilfield composite microbial oil recovery method, characterized in that: the method includes the following steps: 1) The surfactant-producing bacteria and the polymer-producing bacteria are cultured in indoor shake flasks, and the primary and secondary seed tanks are amplified. And fermentation production in the production tank to obtain high-activity fermentation broth of surfactant-producing bacteria and fermentation broth of polymer-producing bacteria;

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

[0032] 3) The composite microbial liquid obtained in step 2) is used as an oil-displacing agent to be directly injected into the oil layer through a water injection well to obtain crude oil from the production well.

Embodiment 2

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

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

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

[0037] 3) The composite microbial liquid obtained in step 2) is used as an oil-displacing agent to be directly injected into the oil layer through a water injection well to obtain crude oil from the production well.

[0038] The surfactant-producing strain is Pseudomonas aeruginosa YM4 (Pseudomonas aeruginosa), and its metabolite is rhamnose surfactant. After three-stage fermentation, the surface tension of...

Embodiment 3

[0062] The invention was applied in the Yuanmao test area of ​​Yanchang Petroleum Wayaobao Oil Production Plant. A microbial flooding test of 10 injection and 32 recovery was carried out. The injection method of water injection well was adopted. Since the field test, the injection pressure has dropped and the average injection pressure From 5.1MPa to 4.6Mpa, the pressure drop rate reaches 10%. The output of oil wells has increased steadily. A total of 17 oil wells in the test area have seen obvious oil increase effects. The average daily oil production of each well in the test well group has 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 that can be applied to low-permeability oilfields. Background technique [0002] With the rapid economic development of our country, the demand for oil is increasing, and the oil shortage 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 reservoirs. According to statistics, the country’s low-permeability oil resources are 53.7 billion tons, accounting for 49% of the total resources; low-permeability oilfields are difficult to exploit, which has caused great difficulties in stabilizing oilfields. Therefore, how to develop low-permeability oilfields is an urgent issue facing oil workers. problem. [0003] Microbial oil recovery is the use of microbial li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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