Pore-level simulation experiment device for alternately displacing oil by microorganisms and air in porous media

Abstract

The invention relates to a pore-level simulation experiment device for alternately displacing oil by microorganisms and air in porous media. The pore-level simulation experiment device comprises a micro-pump, an air pump, a valve, a first intermediate container, a second intermediate container, a third intermediate container, a pressure sensor, a microscopic visualization transparent model, a sampler, a vacuum pump, a bubble tower, a computer, a three-dimensional video microscope, a hot water circulating heater and constant-temperature circulating water bath. The pore-level simulation experiment device has the advantages that remaining oil distribution images can be observed in real time, can be acquired and can be quantitatively analyzed in procedures for alternately displacing the oil by the microorganisms and the air; injection pressures can be measured in real time in the procedures for alternately displacing the oil by the microorganisms and the air; the water content and the oil production of microorganism and air alternative displacement can be metered and analyzed; pore throat characteristics of real oil reservoir rock can be reflected by the designed microscopic visualization transparent quartz sand model, and the model is filled with transparent quartz sand, is convenient to clean and can be refilled with transparent quartz sand to be used.

Description

technical field [0001] The invention relates to a pore-level simulation experiment device for alternate oil displacement of microorganisms and air in a porous medium, belonging to the technical field of petroleum. Background technique [0002] Microbial oil recovery is very effective in the production of sandstone and carbonatite reservoirs, and it is also applicable to other types of reservoirs. Compared with other tertiary oil recovery methods, microbial oil recovery technology has the characteristics of simple on-site construction, no environmental pollution, easy operation, low cost and high efficiency, and low risk. However, microbial oil recovery also has its own deficiencies and limitations: at present, most of the microbial flooding bacteria are facultative anaerobic microorganisms, which perform aerobic respiration under aerobic conditions and have a high level of growth and reproduction; generally do not reproduce in anaerobic environments. Just to survive. Becau...

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Problems solved by technology

However, microbial oil recovery also has its own deficiencies and limitations: at present, most of the microbial flooding bacteria are facultative anaerobic microorganisms, which perform aerobic respiration under aerobic conditions and have a high level of growth and reproduction; generally do not reproduce in anaerobic environments. survival only

However, this model is a two-dimensional model, and what is etched on glass and other materials is the enlarged rock pore throat feature, which cannot accurately reflect the porous medium characteristics of real reservoir rocks; at the same time, due to the pore throat size of the microscopic etching model The reason is that after the oil displacement agent is injected into the microscopic etching model, it is difficult to clean, the repeatability is poor, and quantitative measurement cannot be realized

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