Microbial enhanced oil recovery method

Abstract

The invention discloses a microbial enhanced oil recovery method. The method mainly includes the steps that microbes are injected into a well, a microbial solution with an oxygen source is injected into a petroliferous bed, then water is injected, crude oil is obtained through a beneficial production well, the microbial solution with the oxygen source is injected in a slug mode, a microbe injection well is closed for at least two days after the microbe solution is injected, then the well is opened and water is injected, and crude oil is obtained through the beneficial production well. The microbes are aerobic and / or facultative anaerobic bacteria. The activity of the microbes injected in an oil reservoir reaches a high level, performance of the microbes is played to the largest extent, and the oil displacement effect of the microbes is improved.

Description

technical field

[0001] The invention relates to an improved method for microbial oil recovery. Background technique

[0002] Research on microbial oil recovery began in the 1920s. Its main mechanism is to use microorganisms to degrade crude oil in oil reservoirs to reduce crude oil viscosity and improve crude oil fluidity; metabolize biosurfactants and organic solvents to improve oil washing efficiency; Medium growth, stripping oil film and other effects to improve oil recovery. Microbial oil recovery method is especially suitable for later oil recovery in oil fields. Due to the low cost, wide application range and simple construction, this technology has attracted great attention from the petroleum industry.

[0003] The main factors affecting the effect of microbial oil recovery in microbial oil recovery include: the injection method of microorganisms, the supplement of nutrients and oxygen, and the control of microbial fermentation time in the reservoir. At present, th...