Method for regulating and controlling microbial community for oil extraction

Abstract

The invention relates to a technique for microbe oil extraction, in particular to a method for regulating and controlling a microbial community for the oil extraction. The method comprises the following regulating and controlling steps of: firstly, performing field sampling and detection on a goal oil deposit; secondly, judging a structure and the nutrient deficiency condition of the oil deposit microbial community according to a detected result, and then determining a preliminary regulation and control scheme; thirdly, optimizing the preliminary regulation and control mode by using a microbeoil displacement physical simulation experiment, and then determining a final regulation and control scheme; and finally, performing field implementation according to the optimized final regulation and control scheme. The invention provides the method for regulating and controlling the microbial community to be evolved into the goal structure in different phases of the field implementation, whichfurther improves the recovery ratio of the microbe and the effect of the field implementation.

Description

1. Technical field: [0001] The invention relates to a microbial oil recovery technology, in particular to a method for regulating and controlling microbial communities for oil recovery, and is especially suitable for an improved method for improving oil recovery by microbial flooding in medium-high temperature (greater than 50°C) oil reservoirs. 2. Background technology: [0002] Microbial Enhanced Oil Recovery refers to the technology that uses microorganisms (mainly bacteria, archaea) and their metabolites to increase crude oil production and recovery. Compared with other tertiary oil recovery technologies, microbial oil recovery technology has a wide range of applications. , simple process, good economic benefits, no pollution and other characteristics, has a good application prospect, so it has received more and more attention. At present, three types of technologies have been formed: microbial single well wax prevention, microbial stimulation and microbial flooding. ...

AI Technical Summary

Problems solved by technology

[0005] 1. The traditional method only researches and determines the activation formula before the on-site implementation. Once it enters the on-site implementation, the formula is almost unchanged. It lacks dynamic monitoring and effect analysis of the on-site operation process, lacks corresponding control methods and countermeasures, and cannot be used on-site. Make timely response and adjustment to the effect and problems

[0006] 2. Considering the characteristics of medium-high temperature oil reservoirs, although microorganisms can survive at extreme high temperatures, no bacterial strains that overexpress metabolites such as surfactants and biopolymers have been found under high temperature conditions, and no obvious such strains have been detected in the field. Biomass

[0007] 3. The level of microbial community analysis is relatively lagging behind, and has not yet been closely combined with physical simulation methods to form a perfect detection-regulation system. Therefore, it does not yet have the ability to optimize activation and control formulas at any time according to the real-time conditions of the reservoir

However, the disadvantage of this method is that the fixed nutrient formula designed before implementation is still used throughout the implementation process, but the amount is added and supplemented continuously, and the injection formula is not analyzed and adjusted according to the specific microbial community ecological changes in the oil reservoir. There is no way to regulate the microbial community, and there is a lack of on-site adaptability and pertinence

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