Bacterium capable of reducing crude oil viscosity

Abstract

The invention relates to a bacterium capable of reducing crude oil viscosity. The bacterium capable of reducing the crude oil viscosity of the invention is a pseudomonas Hd-DN-2-1 belonging to pseudomonas, and the invention is preserved in China Center for Type Culture Collection in preservation number of CCTCC No.M2010341 in 9 Dec., 2010. The bacterium capable of reducing crude oil viscosity of the invention can realize obvious viscosity reducing effect, and the viscosity reducing rate can reach 51.75; the bacterium is characterized by producing organic acid such as formic acid, acetic acid,propionic acid, butyric acid, succinic acid, lactic acid and the like which can effectively dissolve the depositional carbonate in the hole of oil reservoir rock in underground mineral reserves, increasing porosity and permeability of the oil reservoir, improving the crude oil flowing environment and the fluidity, and reducing the crude oil viscosity, in order that having more effective exploitation in tertiary oil recovery.

Description

technical field [0001] The invention relates to a bacterium for reducing the viscosity of crude oil. Background technique [0002] In the periphery of the oil field, low-permeability and low-abundance oil-bearing blocks have large geological reserves, and oil is buried in underground rock pores. Some reservoirs have high oil viscosity and low permeability, relying on mechanical pressure, water injection or polymer injection. Exploitation is costly and technically difficult, making it difficult to realize economical and effective exploitation of these oil reservoirs. [0003] Microbial oil recovery technology, that is, microbial enhanced oil recovery technology, injects screened microorganisms into the oil reservoir, utilizes the beneficial activities of microorganisms in the oil reservoir, and the interaction between the metabolites of microorganisms and the liquid and solid phases in the reservoir. It is a comprehensive technology for improving crude oil recovery by changi...

AI Technical Summary

Problems solved by technology

[0002] In the periphery of the oil field, low-permeability and low-abundance oil-bearing blocks have large geological reserves, and oil is buried in underground rock pores. Some reservoirs have high oil viscosity and low permeability, relying on mechanical pressure, water injection or polymer injection. Exploitation is costly and technically difficult, making it difficult to achieve economical and effective exploitation of these oil reservoirs

[0003] Microbial oil recovery technology, that is, microbial enhanced oil recovery technology, injects screened microorganisms into the oil reservoir, utilizes the beneficial activities of microorganisms in the oil reservoir, and the interaction between the metabolites of microorganisms and the liquid and solid phases in the reservoir. It is a comprehensive technology for improving crude oil recovery by changing some physical and chemical characteristics of crude oil, improving the flow properties of crude oil, and improving crude oil recovery by affecting the properties of the crude oil / rock oil / water interface. It has the characteristics of low cost, environmental protection, etc. However, the types of excellent bacterial strains that can reduce the viscosity of crude oil are limited, which restricts the industrial application of this technology