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Fracturing flowback fluid recovery treatment reusing process method

A technology for recovery and treatment of fracturing flowback fluid, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. complex issues, to achieve high environmental protection value, low cost, and shortened process

Inactive Publication Date: 2015-03-18
DONGYING TUOPU INFORMATION IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing treatment process is long, the cost is high, the investment is large, the process is very complicated, and the treatment effect is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0011] Example 1: The fracturing fluid flowback fluid wastewater from Northeast Branch of Sinopec has a petroleum content of 510 mg / L, a COD content of 10500 mg / L, a ferrous iron content of 66 mg / L, and a SS content of 1550 mg / L. Chemical precipitation was carried out on the fracturing flowback liquid wastewater. The input amount of sodium hydroxide was 4500ppm, the input amount of sodium carbonate was 15000ppm, the input amount of aluminum sulfate was 750ppm, the input amount of polyacrylamide was 6.5ppm, and the input amount of polyaluminum chloride is 4000ppm. After stirring for 60 min, a precipitate was formed and liquid-solid separation was carried out.

[0012] The wastewater after filtration and precipitation enters the electrochemical device for electro-oxidation reduction, electro-coagulation and electro-flotation treatment, with a current density of 7mA / cm2, electrolysis time of 40min, and finally filtration treatment. The petroleum content of the treated wastewater...

example 2

[0015] Example 2: Sinopec Zhongyuan Oilfield Company fracturing fluid flowback fluid wastewater, petroleum content 630mg / L, COD content 8500 mg / L, ferrous iron content 52mg / L, SS content 1700mg / L. The fracturing flowback liquid wastewater was chemically precipitated, the input amount of sodium hydroxide was 3000ppm, the input amount of sodium carbonate was 17500ppm, the input amount of aluminum iron sulfate sulfate was 1500ppm, the input amount of polyacrylamide was 5ppm, and the input amount of polyaluminum ferric chloride The input amount was 3500ppm. After stirring for 50 minutes, a precipitate was formed, and liquid-solid separation was carried out. The wastewater after filtration and precipitation enters the electrochemical device for electro-oxidation reduction, electro-coagulation and electro-flotation treatment, with a current density of 7mA / cm2 and an electrolysis time of 50min, and finally for filtration treatment. The petroleum content of the treated wastewater is ...

example 3

[0018] Example 3: The fracturing fluid flowback fluid wastewater of Sinopec North China Branch has a petroleum content of 780mg / L, a COD content of 13000mg / L, a ferrous iron content of 95mg / L, and a SS content of 1950mg / L. The fracturing flowback liquid wastewater is chemically precipitated, the input amount of sodium hydroxide is 5500ppm, the input amount of sodium carbonate is 21000ppm, the input amount of aluminum sulfate is 2100ppm, the input amount of polyacrylamide is 7ppm, and the input amount of polyaluminum chloride is 5500ppm. After stirring for 70 minutes, a precipitate was formed, and liquid-solid separation was carried out. The wastewater after filtration and precipitation enters the electrochemical device for electro-redox, electro-coagulation and electro-flotation treatment with a current density of 7mA / cm2 and an electrolysis time of 60min, and finally for filtration treatment. The petroleum content of the treated wastewater is 5 mg / L, the COD content is 150 m...

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Abstract

The present invention provides a fracturing flowback fluid recovery treatment reusing process method. The technical scheme comprises that: a precipitating agent is added to fracturing flowback fluid wastewater, and filtration is performed to remove harmful components unsuitable for fluid re-preparation, such that the harmful components can not affect the reuse and the fluid re-preparation, wherein the precipitating agent can be one or a plurality of materials selected from sodium hydroxide, sodium carbonate, aluminum sulfate, aluminum ferric sulfate silicate, polyacrylamide and polymeric aluminum ferric chloride; the precipitated flowback fluid is subjected to an electrochemical treatment so as to be subjected to actions such as oxidation, reduction, air flotation and flocculation; and the electrochemically-treated flowback fluid is subjected to an active carbon felt filtration treatment, such that the purpose of the reuse and the fluid re-preparation are achieved. According to the present invention, the useful components and the harmless components are not destroyed, the process is shortened, the cost is low, the operation is easy, and the high promotion application value is provided; and the method is based on the fracturing flowback fluid recycling and the fluid re-preparation, the sewage emission is avoided, the fresh water is saved, and the high environmental protection value is provided.

Description

Technical field: [0001] The invention relates to the technical field of oil and gas field exploitation, in particular to a process method for recovery, treatment and reuse of fracturing flowback fluid. Background technique: [0002] At present, the advanced treatment of fracturing flowback fluid includes electrochemical treatment method and biological treatment method. The difficulty of using advanced treatment to reach the standard discharge is to reduce COD. Among them, the electrochemical treatment method requires a large amount of dosing and requires high cost of micro-electrolysis. Most of the cost Consumed in reducing COD, strong acid, strong alkali and other regulators are needed, which is not conducive to safe production, and its treatment effect is also unstable; biological treatment requires a suitable ambient temperature, and the degradation time is long. It is still in the experimental stage and has not been applied on site. , the technology is not yet mature. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F1/52C02F1/56
Inventor 李建华杨向莲王琪陈树军朱开亮
Owner DONGYING TUOPU INFORMATION IND
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