A kind of high-efficiency and low-cost oilfield compound fungicide and its preparation method

Abstract

The invention provides an oilfield compound bactericide with high efficiency and low cost. A technical scheme of the invention is as follows: the compound bactericide comprises the following components by weight: 15 to 25% of tetradecyl dimethyl nitrile ammonium chloride and 15 to 25% of glutaraldehyde, with the balance being water or a mixture of methanol and water. The invention also provides a preparation method for the oilfield compound bactericide with high efficiency and low cost. The preparation method comprises the following steps: uniformly mixing tetradecyl dimethyl nitrile ammonium chloride and glutaraldehyde; when the room temperature is higher than 10 DEG C, supplementing water; and when the room temperature is lower than 10 DEG C, adding methanol, and supplementing water. The bactericide provided by the invention uses tetradecyl dimethyl nitrile ammonium chloride to substitute common tetradecyl benzyl dimethyl ammonium chloride, and the effect of acrylonitrile is better than the effect of benzyl chloride compounded glutaraldehyde, so the bactericidal ability is improved, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry in the petroleum industry, and mainly relates to a high-efficiency and low-cost oilfield compound fungicide and a preparation method thereof. Background technique [0002] Bacterial corrosion hazards have always existed in oilfield production. Especially with the development of secondary and tertiary oil recovery technologies, most oilfields have entered a high water-cut development period. The application of polymer flooding has created favorable conditions for the propagation of bacteria in the oilfield system, making the problem of bacterial corrosion increasingly serious. In the oilfield water injection system, various microorganisms, such as sulfate reducing bacteria (SRB), iron bacteria, saprophytic bacteria and other microorganisms, can cause damage to drilling equipment, water injection pipelines and other metal materials during their growth, metabolism and reproduction. Severe...

AI Technical Summary

Problems solved by technology

In the oilfield water injection system, various microorganisms, such as sulfate reducing bacteria (SRB), iron bacteria, saprophytic bacteria and other microorganisms, can cause damage to drilling equipment, water injection pipelines and other metal materials during their growth, metabolism and reproduction. Severe corrosion, and blockage of pipelines, damage to oil layers, resulting in water injection, oil production, oil and gas quality decline, but also bring serious difficulties to crude oil processing, resulting in great economic losses

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