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Method for increasing oil recovery ratio by utilizing symbiotic reproduction and complex metabolism and microbial preparation

A microbial preparation and recovery factor technology, applied in the field of CR-CM technology, can solve the problems of unstable oil production microbial communities in oil reservoirs, inability to accurately understand reservoir microorganisms, and neglect of multi-compatibility of microorganisms, so as to increase oil recovery. efficiency, prolongation of production time, and the effect of improving reservoir conditions

Inactive Publication Date: 2010-11-10
华汉生态修复新技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Through analysis, the main reasons are attributed to two points: First, due to backward detection methods, it is impossible to accurately understand the microorganisms in the reservoir, and the injection of preparations is blind
When the formulation interacts with reservoir microbes, production increases; conversely, production decreases
Second, due to the emphasis on the function of a single species of bacteria and the neglect of the compatibility of multiple bacterial groups and the construction of microbial ecosystems for oil production in oil reservoirs, the microbial communities in oil production in oil reservoirs are unstable
Therefore, there will be a regularity of "injecting the preparation will increase the yield, but the persistence will be poor"

Method used

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  • Method for increasing oil recovery ratio by utilizing symbiotic reproduction and complex metabolism and microbial preparation
  • Method for increasing oil recovery ratio by utilizing symbiotic reproduction and complex metabolism and microbial preparation
  • Method for increasing oil recovery ratio by utilizing symbiotic reproduction and complex metabolism and microbial preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1 Reservoir Specific Oil Well Selection and Molecular Evaluation System

[0038] Reservoir investigation: investigate the geological conditions of the reservoir, including reservoir temperature, porosity, pressure, permeability, recovery degree, remaining oil distribution, oil product characteristics, formation water salinity, etc. The environment also includes the micro-environment of the micro-environment of the oil reservoir microorganisms. The present invention has no specific limitation on the microbial environment of the oil reservoir, as long as there are microbial flora in the oil reservoir, there is no need to specifically limit what kind of microorganisms it is. The specific applicable reservoir parameters are as follows:

[0039] Temperature3%, water content>10%, permeability>20×10 -3 μm 2 ;

[0040] 1. Extraction of metagenomic DNA from oil reservoir soil or water samples

[0041] Reservoir soil samples were taken from Well Meng 9-11 at a depth o...

Embodiment 2

[0050] Example 2 Establishment and effect evaluation of laboratory CR co-metabolism system

[0051] In order to ensure the effect of the CR system field experiment, we conducted indoor evaluation tests on the CR system of each well before construction, mainly including emulsification viscosity reduction test, surface tension and acidity change test. Utilize Rhodococcus erythropo LY-LH-11a described in the present invention, preservation number is: CGMCCNo.3510 and stenotrophmonas (Stenotrophmonas maltophilia LY-LH-11b), preservation number is: CGMCC No. 3509 composite microbial agent was tested, and the numbering system was CR-J3 system.

[0052] 1. Emulsification viscosity reduction test

[0053] After sterilizing the culture medium, put them into 500mL experimental bottles, each containing 100mL, and add 80g of sterilized crude oil. Keep three blank parallel samples, and insert two strains (Rhodococcus CGMCC No.3510 and Stenotrophomonas CGMCC No.3509. 5% inoculum) into the...

Embodiment 3

[0068] Embodiment 3 activator selection and evaluation

[0069] 1. Reservoir formation water bacteria activation experiment

[0070] The present invention selects the activator as an emulsification activator and a gas production activator, and the formula of the emulsification activator is: 3wt‰molasses, 50wt‰C 12 or C 16 , dipotassium hydrogen phosphate 1wt‰, ammonium nitrate 4wt‰; the laboratory number of the emulsification activator of the present invention is CY5.

[0071] The gas production activator formula: molasses 8wt‰, bran 2wt‰, dipotassium hydrogen phosphate 1.5wt‰, ammonium nitrate 0.5wt‰. The laboratory number of the gas production activator of the present invention is CY9.

[0072] After the activator treatment, the total biomass after activation increased by 4 to 5 orders of magnitude, as shown in Table 3. At the same time, the functional bacteria were activated and the harmful bacteria were effectively inhibited, achieving the purpose of selective activatio...

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Abstract

The invention discloses a method for increasing the oil recovery ratio by utilizing symbiotic reproduction and complex metabolism and a microbial preparation, the CR-CM principle is mainly utilized for periodically injecting exogenous oil production microbes, an activating agent and air into a target oil layer, and an endogenous and exogenous oil production microbial new system (CR) is established in the oil layer by greatly activating endogenous oil production microbes. All the oil production microbes in the CR system are mutually linked through a biological chain through the technical control, and the complex metabolism (CM) which is conductive to oil production is further produced, thereby realizing the purposes of increasing the oil and increasing the recovery ratio under the dual-function of the oil production microbes and complex metabolites thereof. The method can not only increase the oil production, but also improve the oil reservoir conditions, increase the final recovery ratio by more than 4% and prolong the exploitation time by 3-5 years. For an oil field with high viscosity and high wax content, the method can reduce the viscosity of thick oil by more than 24%, reducea freezing point by 5-10 DEG C, increase the final recovery ratio by more than 5% and prolong the exploitation time by more than 5 years.

Description

technical field [0001] The invention relates to a method for enhancing oil recovery and a microbial preparation, specifically a technology utilizing symbiotic reproduction and complex metabolism (Commensal Reproduction & Complex Metabolism), referred to as CR-CM technology. Background technique [0002] Petroleum is the lifeblood of the world's industrial and economic development, and the development and utilization of petroleum resources are facing a series of severe problems. Worldwide, only 30% to 40% of the crude oil in underground oil reservoirs can be recovered with primary and secondary oil recovery techniques, and the residual oil left in the formation still accounts for 60% to 70%. How to extract the residual oil left in the ground to enhance oil recovery? It has been a subject of continuous research in many countries in the world for many years (Lai Fengpeng, Cen Fang, Huang Zhiwen, Xu Jinjin. Overview of the development of microbial oil recovery technology [J]. R...

Claims

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Application Information

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IPC IPC(8): C12N1/00C12N1/20C09K8/582E21B43/22C12R1/01
Inventor 王新民
Owner 华汉生态修复新技术有限公司
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