Depolymerization treatment method for hydrophobic associated polymer-containing oil sludge

Abstract

The invention discloses a depolymerization treatment method for hydrophobic associated polymer-containing oil sludge. The method comprises the following steps: mixing water and hydrophobic associatedpolymer-containing oil sludge at the temperature of 40-80 DEG C, wherein the mass ratio of the water to the hydrophobic associated polymer-containing oil sludge is (0.5-5):1; adding a depolymerizing agent A into the mixed oil sludge, uniformly stirring, adding a depolymerizing agent B, stirring for 30-180 s, pumping the oil sludge mixture into a horizontal screw centrifuge, carrying out three-phase separation for 2-6 min, and centrifuging to obtain bottom mud having crude oil on an upper layer, water on a middle layer and solid on a lower layer. The method has the beneficial effects that the polymer is degraded by adopting the inorganic chemical agent which is simple in structure and low in cost, the degradation effect of the agent on the polymer is brought into full play by adjusting theprocess, the viscosity of the oil sludge is reduced, and the phenomenon of expansion and gelatinization in subsequent treatment is avoided. The depolymerization treatment method provided by the invention is suitable for the pretreatment process of the hydrophobic associated polymer-containing oil sludge before reduction, recycling and harmless treatment.

Description

technical field [0001] The invention relates to a depolymerization treatment method for oil sludge containing hydrophobic association polymers, and belongs to the technical field of oil sludge treatment containing polymers in the process of oil exploitation and refining. Background technique [0002] In the past ten years, polymer flooding has been widely used in oil field production. With the expansion of polymer injection scale and the continuous increase of liquid production, the polymer injection fluid in the reservoir channels returns with the production fluid, and in the oil well It is emulsified with inorganic minerals, crude oil, etc., and further interacts with various additives in the production fluid treatment process, and then deposits and precipitates in the treatment systems of platforms, terminals, and refineries to form poly-containing oil sludge. [0003] Crude oil, polymers, solid particles, surfactants, inverse demulsifiers, flocculants, etc. in the sludge...

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Problems solved by technology

CN102849907, CN104910323, CN105084657, and CN108911447 all involve the use of medicaments for depolymerization treatment. These methods use compound medicaments, which contain demulsifiers, flocculants, etc., and one of the reasons for the generation of oily sludge containing The interaction between demulsifiers, flocculants and other agents added in the liquid treatment process and the polymer, the existence of these agents will affect the degradation effect on the polymer, and these methods are all focused on solving the oil-cement three-phase separation or oil removal effect The problem of how to effectively degrade the polymers in oil sludge, especially the problem of hydrophobic association polymers

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