Screening method of microorganism long-acting activating agent for oil extraction

Abstract

The invention belongs to the technical field of microorganism oil extraction, and particularly relates to a screening method of a microorganism long-acting activating agent for oil extraction. The screening method specifically comprises the following steps that components of the long-acting activating agent are screened under the aerobiotic and anaerobic conditions; the concentration of the long-acting activating agent is optimized; physical modeling evaluation is performed on the long-acting activating agent, wherein physical modeling evaluation comprises injectability evaluation and oil displacement efficiency evaluation; finally the oil reservoir microorganism long-acting activating agent system for oil extraction is obtained. The method is simple and high in operability and pertinency; the long-acting activating agent system obtained through the screening method not only can meet the nutrition requirements of microorganisms near a wellbore, but also can meet the nutrition requirements of microorganisms at the deep of an oil reservoir, is good in application effect and can improve the oil displacement efficiency of the microorganisms, and therefore the long-acting activating agent can be widely applied to the technical field of microorganism oil extraction.

Description

technical field [0001] The invention relates to the field of microbial oil recovery, in particular to a screening method for microbial long-acting activators for oil recovery. Background technique [0002] Microbial oil recovery technology, as an emerging enhanced oil recovery technology, mainly injects activators into the reservoir, and uses the metabolites of microorganisms or the bacteria themselves to improve the oil displacement efficiency. The activation effect of microorganisms is a key indicator of enhanced oil recovery of reservoir microorganisms, and it is closely related to the composition of activators and their distribution in the reservoir. A large number of laboratory experiments show that microbial flooding is the result of joint activation of aerobic and anaerobic microorganisms. The reservoir is affected by long-term activator injection, and a microbial community with a large biomass has formed near the wellbore, while microbial flooding The currently used...

AI Technical Summary

Problems solved by technology

The results of a large number of laboratory experiments show that microbial flooding is the result of the joint activation of aerobic and anaerobic microorganisms. The reservoir is affected by long-term activator injection, and a microbial community with a large biomass has formed near the wellbore. The currently used activator system is mainly based on quick-acting nutrients, which can quickly and effectively activate the reservoir microbial community. At the same time, the concentration of nutrients contained in the currently used activator will be greatly reduced, and the effective nutrient content of the activator will be low when it reaches the deep part of the reservoir. , resulting in the microbial community deep in the reservoir not being able to get sufficient nutrition, unable to meet its growth and metabolism, unable to form a stable microbial community, and play its role in oil displacement, thereby reducing the efficiency of microbial oil displacement

However, simply increasing the injection concentration of conventional activators will inevitably increase material costs and reduce economic benefits, which is not conducive to the popularization and application of microbial flooding technology.

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