Thick oil sewage treatment coagulating agent, and preparation method and application thereof

Abstract

The invention relates to an oilfield sewage treatment coagulating agent, particularly a thick oil sewage treatment coagulating agent. The thick oil sewage treatment coagulating agent comprises the following components in percentage by weight: 15.0-25.0% of polyaluminum chloride, 5.0-10.0% of polyzinc sulfate silicate, 0.5-1.0% of ammonium polydimethyldiallylchloride and 5.0-10.0% of 3.0G polyamide-amine. The preparation method comprises the following steps: adding the polyaluminum chloride and polyzinc sulfate silicate into water in percentage by weight, completely dissolving, adding the ammonium polydimethyldiallylchloride and 3.0G polyamide-amine, stirring uniformly, and regulating the pH value to 3.0-5.0 to obtain the thick oil sewage treatment coagulating agent. The thick oil sewage treatment coagulating agent has the advantages of low consumption and low price, and is suitable for a multifunctional swirl reactor treatment technique. The thick oil sewage treatment coagulating agent has the functions of reverse demulsification and water purification, and has favorable purifying effect on the thick oil high-temperature sewage. The preparation method is simple and easy to implement.

Description

technical field [0001] The invention relates to a coagulant for oilfield sewage treatment, in particular to a coagulant for heavy oil sewage treatment and its preparation method and application. Background technique [0002] Compared with other industrial wastewater, the components of heavy oil high-temperature wastewater in oilfield wastewater are very complex: they contain solid impurities, microorganisms, dissolved gases, and soluble salts, and there are generally miscellaneous organic substances and high salinity , high oil content, and high content of scaling ions. In short, the biggest feature of heavy oil high temperature sewage is "high oil content, high suspended matter, high silicon and high temperature", so there are many difficulties in the purification and treatment of heavy oil high temperature sewage, mainly as follows: (1) The temperature of the discharged sewage is high, reaching 80-90°C, while the traditional coagulant loses its effect at 80-90°C due to mo...

AI Technical Summary

Problems solved by technology

However, when these coagulants are used in the treatment of heavy oil high-temperature sewage in oil fields, although the flocculation speed is fast and the flocculation effect is good, the demulsification performance of emulsified oil and the purification performance of colloidal particles are poor, so they are not suitable for heavily emulsified heavy oil sewage. processing

[0004] At present, domestic oilfields have adopted a multi-functional cyclone reactor treatment process in sewage treatment, in which the purification and separation of oil removal, solid suspended matter and colloidal particles are mainly completed in the cyclone reactor, while the sewage is in the cyclone. The residence time in the reactor is short, only 30-45min, and the content of oil and suspended solids in the high-temperature produced water is high. The effect of removing oil and solid suspended particles in the medium is poor, and it is easy to cause incomplete demulsification and oil removal, and the flocs have a light specific gravity and are not easy to sink, so that ordinary coagulants have little effect on this stable emulsion, and the water quality after treatment not to standard

The method provided in the invention patent with the patent number ZL01118163.X can only treat ordinary oilfield sewage, and cannot treat the above-mentioned heavy oil high-temperature sewage

Images