Biological oil displacement agent and production method and use thereof

Abstract

The invention relates to a biological oil cleaning agent, a method for producing the same and application thereof. The biological oil cleaning agent contains 1.85 to 2.75g / L of coarse biological enzyme extract and 9.75 to 13.45g / L of coarse biosurfactant product. The biological oil cleaning agent has good effect of deplugging and oil displacement; a core displacement test shows the permeability restoration ratio of rock core deplugged by the biological oil cleaning agent averagely exceeds 95 percent and can further improve the extraction yield by over 17 percent on the basis of driving water to ultimate water content.

Description

【Technical field】 [0001] The invention relates to the technical field of oil exploitation industry. More specifically, the present invention relates to bio-washing agents and their production methods and their use. 【Background technique】 [0002] During the production operations such as drilling, well completion, well workover, well killing, well washing, sand washing, acidizing, fracturing and oil production in oil fields, various oil layer damages are often caused, such as emulsification blockage, water lock, suspended particle blockage, Paraffin and colloidal asphaltene deposits, scale, etc., especially the composite plugging of inorganic scale, solid particles and organic scale (paraffin, colloidal asphaltene) wrapped together, and changes in the wettability of oil layer rocks, all of which have caused serious damage to the oil field. Normal production has brought adverse effects. [0003] At present, the block removal and displacement methods adopted in the oil field ...

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Problems solved by technology

[0003] At present, the block removal and displacement methods adopted in the oil field include: (1) Acidification method, which basically uses strong acids such as hydrochloric acid and hydrofluoric acid. Dissolve the cement in the rock skeleton, resulting in loose formation and sand production. If the gas and insoluble matter generated during the acidification process are not removed in time, the acidification residual acid will cause secondary pollution of the formation

In addition, this acid treatment also has the problem of corroding metal pipelines, wellbore and other equipment, and the H 2 S will also cause some damage to the human body, and acidification and plugging removal are not suitable for the transformation of acid-sensitive formations

(2) Fracturing method, this method is an effective measure for the transformation of tight reservoirs, which can improve the conductivity and increase production capacity, but the investment risk of fracturing operation is high and the process is complicated

(3) Microbial plugging removal method, this technology is an environmentally friendly new technology, but it can only play a role after the microorganisms reproduce and metabolize in large numbers underground, so the reaction cycle is long and the effect is slow, and the metabolism of microorganisms in the formation will produce Many unfavorable products, the injection of nutrients will also activate harmful flora such as saprophytic bacteria and sulfate-reducing bacteria, which will have adverse effects

[0004] Generally speaking, chemical plugging removal has serious damage to the formation, and there are many problems such as pipeline corrosion, secondary pollution and environmental protection; physical plugging removal process is complicated, high cost, and investment risk is high; microbial plugging removal oil displacement cycle is long and the effect is slow , It is greatly affected by formation pressure, temperature, etc., and will produce new derivatives that will cause adverse effects

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