Vegetable gum fracturing fluid microorganism composite viscosity reduction system and application thereof in field of thickened oil recovery

Abstract

The invention provides a vegetable gum fracturing fluid microorganism composite viscosity reduction system and application thereof in the field of thickened oil recovery. The vegetable gum fracturingfluid microorganism composite viscosity reduction system comprises vegetable gum, viscosity reduction microorganisms and water, wherein the viscosity reduction microorganisms are selected from one ormore of pseudomonas, bacillus cereus, bacillus subtilis and geobacillus stearothermophilus. The vegetable gum can provide a carbon source required by the growth of microorganisms. In the growth process of viscosity reduction microorganisms, biological surfactants, small molecular organic solvents, gas and the like can be generated through metabolism, on one hand, the biological surfactants can effectively emulsify thickened oil, reduce the viscosity of the thickened oil and improve the fluidity of the thickened oil; on the other hand, the use amount of a gel breaker and the like in the viscosity reduction system can be reduced, the residue amount of the gel breaker is reduced, and the viscosity reduction system has important significance in increasing the recovery ratio of thickened oil.

Description

technical field [0001] The invention relates to the field of heavy oil exploitation, in particular to a vegetable gum fracturing fluid microbial compound viscosity-reducing system and its application in the field of heavy oil exploitation. Background technique [0002] Because heavy oil is rich in complex mixtures of multi-hydrocarbons such as colloids and asphaltenes, it has high density, high viscosity and poor fluidity. How to effectively reduce the viscosity of crude oil has become a key issue in heavy oil production. [0003] Microbial oil recovery technology refers to the technology of using microorganisms and their metabolites to improve crude oil production and recovery. In heavy oil microbial recovery, surfactant-producing microorganisms can produce surfactant substances with carbon sources, nitrogen sources, phosphorus sources, etc. as nutrients. The above-mentioned surfactant substances can emulsify heavy oil and reduce the viscosity of heavy oil, so they are of...

AI Technical Summary

Problems solved by technology

[0008] The main purpose of the present invention is to provide a vegetable gum fracturing fluid microbial composite viscosity reducing system and its application in the field of heavy oil exploitation, so as to solve the problem that the existing fracturing fluid has poor effect in the heavy oil viscosity reducing process