System and method for electrochemically treating high-viscosity fracturing flow-back fluid

A fracturing flowback fluid and treatment system technology, applied in chemical instruments and methods, filtration treatment, water/sewage treatment, etc. The effect of secondary treatment cost, resource and cost saving, and stable effluent quality
CN110642334AInactive Publication Date: 2020-01-03BEIJING DILI WEIYE TECH DEV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING DILI WEIYE TECH DEV
Publication Date
2020-01-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a system for electrochemically treating a high-viscosity fracturing flow-back fluid. The system comprises a pH adjusting unit, an electrocatalytic oxidation unit and an electric flocculation unit which are arranged in sequence, wherein the pH adjusting unit is used for adjusting the pH value of the fracturing flow-back fluid to 4-7, the electrocatalytic oxidation unit comprises an electrocatalytic oxidation device, and the electric flocculation unit comprises an electric flocculation device connected with effluent of the electrocatalytic oxidation device. The inventionalso discloses a method for treating the fracturing flow-back fluid. The method comprises the following steps: 1) adjusting the pH value of the fracturing flow-back fluid to be treated to 4-7; 2) performing electrocatalytic oxidation treatment on the fracturing flow-back fluid obtained in step 1); and 3) performing electric flocculation treatment on effluent in step 2). The treatment system and the method mainly adopt electric energy to achieve the treatment of the fracturing flow-back fluid, so the system and the method accord with the clean production category; and a large amount of an organic or inorganic polymer agent is not needed in the treatment process, so the system and the method have the advantages of no secondary pollution, stable effluent quality, and saving of resources and cost.
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Description

technical field

[0001] The invention relates to an electrochemical treatment system for high-viscosity fracturing flowback fluid and a corresponding treatment method, belonging to the technical field of sewage treatment in the petrochemical industry. Background technique

[0002] Fracturing flowback fluid refers to the residual fracturing fluid remaining after fracturing operations and flowing back from the wellhead. Due to the addition of many additives during fracturing, the residual guar gum, suspended solids, crude oil, part of the brine in the formation brought out during flowback, and other organic additives in the fracturing waste fluid are toxic and harmful and difficult to degrade. Substances, resulting in complex and changeable components, high chloride content, often present the characteristics of "three highs" (high viscosity, high stability, high COD value). If the fracturing flowback fluid is directly sent to the existing sewage treatment system for treatment,...

Claims

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