Oil field polymer-containing sewage viscosity reduction treatment method

Abstract

The invention provides an oil field polymer-containing sewage viscosity reduction treatment method. According to the method, a metal cation compound is added into polymer-containing sewage of an oil field to generate a charge shielding effect, so that a polymer molecular chain is shrunk, and a viscosity reduction effect is achieved, an oxidizing agent is added into polymer-containing sewage of anoil field, free radical chain reaction is induced to be reversed, a polymer chain is broken, and the viscosity reduction effect is achieved. Therefore, viscosity reduction of the polymer-containing sewage in the oil field is realized, and subsequent conventional treatment is facilitated. The method is suitable for treatment of oilfield polymer flooding produced water.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment methods, and in particular relates to a viscosity-reducing treatment process for oilfield sewage containing polymers. Background technique [0002] At present, polymer flooding is widely used in tertiary oil recovery in domestic oilfields, and a considerable amount of polymer remains in the produced water of polymer flooding, which leads to an increase in the viscosity of produced water. The impact of increased sewage viscosity on sewage: 1. Increase the stability of the colloid in the water and increase the settling time; 2. The oily oil droplets in the water become smaller, making them stable in the water body and increasing the difficulty of treatment; 3. Interfering with the effect of flocculants, increasing Large dosage of chemicals; 4. The viscosity of sewage is high, which increases the difficulty of the filtration process. Due to the increase in the viscosity of sewage, the curre...

AI Technical Summary

Problems solved by technology

[0002] At present, polymer flooding is widely used in tertiary oil recovery in domestic oilfields, and a considerable amount of polymer remains in the produced water of polymer flooding, which leads to an increase in the viscosity of produced water

The impact of increased sewage viscosity on sewage: 1. Increase the stability of the colloid in the water and increase the settling time; 2. The oily oil droplets in the water become smaller, making them stable in the water body and increasing the difficulty of treatment; 3. Interfering with the effect of flocculants, increasing Large dosage of chemicals; 4. The viscosity of sewage is high, which increases the difficulty of the filtration process

Due to the increase of sewage viscosity, the current conventional sewage treatment process and chemicals can not achieve better treatment effect