Method for regulating and controlling growth metabolic rule of indigenous microorganisms of oil pool

Abstract

The invention belongs to the technical field of microbial enhanced oil recovery, and particularly relates to a method for regulating and controlling a growth metabolic rule of indigenous microorganisms of an oil pool. The method specifically comprises the following steps of sampling of the test oil pool; determining of the growth metabolic rule of the indigenous microorganisms of the oil pool; determining of a process for increasing cell concentration of a delay period; determining of a process for prolonging the cycle of a stable period; determining of a final regulation and control scheme; and field testing. The method has the advantages that the regulation and control idea is clear, the processes are simple, and the pertinence and the operability are strong; and meanwhile, the method has the advantages that the field test effect is good, and the input-output ratio is high, in the case of the field test, the recovery ratio is increased by greater than 18.0%, and the input-output ratio is greater than 1:12, and therefore, the method can be widely applied to the microbial enhanced oil recovery field test.

Description

Technical field [0001] The invention belongs to the technical field of microbial oil recovery, and specifically relates to a method for regulating the growth and metabolism of endogenous microorganisms in an oil reservoir. Background technique [0002] Endogenous microbial flooding is a technology that injects an activator into the formation to activate the endogenous microorganisms in the reservoir, and improves the oil recovery through the interaction of microorganisms and their metabolites with rocks and crude oil. The material basis of endogenous microbial flooding is the endogenous microbes in the reservoir. The concentration of bacteria and metabolic activity of the endogenous microbes in the reservoir before activation are very low, which cannot meet the requirements of microbial flooding. Laboratory research and field application results show that during the activator injection process, the microbial concentration in the oil well produced fluid presents a growth curve sim...

AI Technical Summary

Problems solved by technology

Lag phase: the microorganisms have just come into contact with the activator, their metabolic system needs to adapt to the new environment, the cell proliferation is slow, the bacterial concentration does not increase significantly, and the water content of the produced fluid does not contribute to the oil displacement effect; logarithmic phase: after the microorganisms adapt to the activator , the growth rate is gradually accelerated, and the bacterial concentration increases exponentially. With the active metabolic activities of the bacterial body, the water content gradually decreases; the stable period: the number of bacteria remains relatively stable, the bacterial concentration reaches the peak level, and the accumulation of cell metabolites reaches the highest peak. During this period, the water content of the produced fluid decreased significantly, and the oil displacement effect was obvious; the decline period: the death rate of bacteria was greater than the rate of new generation, the endogenous microbial population in the entire reservoir showed negative growth, the field water content increased rapidly, and the oil displacement efficiency decreased

During the entire activation process, the growth and metabolic activity of endogenous microorganisms in the reservoir is low during the residence period and decay period, and the corresponding oil displacement efficiency is also low, which affects the microbial oil displacement effect

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