Multifunctional preparation for controlling biological corrosion and blockage of oilfield production system

Abstract

The invention relates to a multifunctional preparation for controlling biological corrosion and blockage of an oilfield production system. The contents of functional preparations in the treating water are as follows: 20 to 200 ppm of disinfectant: glutaraldehyde, acrolein, dodecyldimethylbenzyl ammonium chloride or dodecyldimethylbenzyl ammonium bromide, 10 to 100 ppm of inhibitor: sodium nitrateor sodium nitrite; and / or 10 to 20 ppm of sodium molybdate, sodium tungstate or lithium molybdate; 10 to 20 ppm of corrosion inhibitor: imidazoline quaternary ammonium; or / and 20 to 50 ppm of desulphurizing reagent: trihydroxymethyl nitromethane; or / and 10 to 20 ppm of penetrating agent: alkylpheol ethoxylates. The components undergo synergistic action so that the concentration of the single component is reduced obviously and reaches 25 to 90%, and the efficiency of killing the SRB (Sulfate Reducing Bacteria) reaches more than 90%.

Description

technical field [0001] The invention relates to a multifunctional preparation for controlling biocorrosion and clogging of an oil field production system. Background technique [0002] Microorganisms in oilfield injection water are generally divided into anaerobic microorganisms and aerobic microorganisms. Anaerobic microorganisms are mainly sulfate-reducing bacteria, anaerobic fermentation bacteria, methanogenic bacteria and denitrifying bacteria. Aerobic microorganisms are mainly hydrocarbon oxidizing bacteria, iron bacteria and Saprophytes. Sulfate-reducing bacteria, iron bacteria and saprophytic bacteria are the main causes of microbial corrosion and plugging of oilfield water injection systems and water injection formations. As long as there is a small amount of aerobic saprophytic bacteria, they can reproduce. Where saprophytic bacteria exist, there is bacterial slime, which sticks with crude oil, corrosion products, and scale in the sludge to form bacterial slime, wh...

AI Technical Summary

Problems solved by technology

However, because the bactericide used is difficult to penetrate the biofilm and scale, it can only kill the free SRB in the water, so the efficiency of killing SRB is low, so the oil field equipment is still corroded

The chemicals currently used to kill SRB directly are highly toxic. Long-term use not only pollutes the environment, but also easily produces drug resistance. Only by increasing the dosage and replacing with new fungicides

The current technical methods do not remove the formed hydrogen sulfide and ferrous sulfide in time, which will still cause corrosion and blockage to the formation and downhole equipment