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Method for breaking colloid of fracturing flow-back liquid based on gamma-hydroxyl iron oxide catalytic ozone advanced oxidation system

An iron oxyhydroxide, fracturing flowback fluid technology, applied in chemical instruments and methods, oxidized water/sewage treatment, special compound water treatment, etc., can solve the problem of high operating cost, unsatisfactory treatment effect, macromolecular colloid and organic Insufficient degradation and other problems, to achieve the effect of fast breaking speed, increasing contact area and time, and large porosity

Inactive Publication Date: 2018-02-09
CHENGDU EN SHAIN TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the operating cost of this method is high, and the degradation of macromolecular colloids and organic matter in the wastewater of the oilfield industry is not complete at low doses and in a short period of time, and the treatment effect is not ideal

Method used

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  • Method for breaking colloid of fracturing flow-back liquid based on gamma-hydroxyl iron oxide catalytic ozone advanced oxidation system
  • Method for breaking colloid of fracturing flow-back liquid based on gamma-hydroxyl iron oxide catalytic ozone advanced oxidation system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Gel breaking treatment of fracturing flowback fluid in Zhuoye 1 Well, Qianjiang, Chongqing

[0025] The total amount of fracturing flowback fluid produced by Zhuoye 1 well in Qianjiang, Chongqing totaled 19,000m 3 . The water quality is complex, the viscosity is high, the treatment is difficult, and the emulsification degree is high, the COD is high, the salinity is high, and the stability is high. Due to the difficulty of processing, the reaction residence time and the proportion of ozone dosing should be appropriately increased.

[0026] The treatment process and parameters of the advanced ozone oxidation system catalyzed by γ-iron oxyhydroxide are as follows:

[0027] (1) Preparation of γ-iron oxyhydroxide catalyst: Iron filings are dissolved with acid to control the pH to 1.5, and the H to be added is calculated according to the concentration of ferrous ions 2 o 2 The amount of iron filing acid solution in the control of ferrous ion concentration Fe ...

Embodiment 2

[0033] Example 2: Changning H 4 Platform fracturing flowback fluid treatment

[0034] Changning H 4 The total amount of fracturing flowback fluid wastewater generated by the platform has accumulated to 6000m 3 . Ca in the fracturing flowback fluid 2+ , Mg 2+ And the TDS content is high, the viscosity is relatively small, and the processing difficulty is moderate, so the reaction residence time can be appropriately shortened and the ozone dosing ratio can be reduced.

[0035] The treatment process and parameters of the advanced ozone oxidation system catalyzed by γ-iron oxyhydroxide are as follows:

[0036] (1) Preparation of γ-iron oxyhydroxide catalyst: Iron filings are dissolved with acid to control the pH to 1.5, and the H to be added is calculated according to the concentration of ferrous ions 2 o 2 The amount of iron filing acid solution in the control of ferrous ion concentration Fe 2+ with H 2 o 2 The ratio is 1:1.0, stirring and reacting for 30 minutes, addin...

Embodiment 3

[0042] Example 3: Treatment of fracturing flowback fluid in Well Dazu 201

[0043] The total amount of fracturing flowback fluid wastewater produced by Well Dazu 201 totaled 2000m 3 . Fracturing flowback fluid wastewater has high COD and SS, high salinity, strong stability, high viscosity, and complex water quality, which is difficult to treat.

[0044] The treatment process and parameters of the advanced ozone oxidation system catalyzed by γ-iron oxyhydroxide are as follows:

[0045] (1) Preparation of γ-iron oxyhydroxide catalyst: Iron filings are dissolved with acid to control the pH to 1.2, and the H to be added is calculated according to the concentration of ferrous ions 2 o 2 The amount of iron filing acid solution in the control of ferrous ion concentration Fe 2+ with H 2 o 2 The ratio is 1:1, stirring and reacting for 30 minutes, adding NaOH continuously and uniformly for 2 hours, finally controlling the pH to 4.5, controlling the temperature below 24°C, inoculat...

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Abstract

The invention discloses a method for breaking colloid of fracturing flow-back liquid based on a gamma-hydroxyl iron oxide catalytic ozone advanced oxidation system. The method comprises the followingsteps: (1) preparation of a gamma-hydroxyl iron oxide catalyst; (2) building of fluidized bed catalytic filler; (3) conversion of an ozone advanced oxidation system; (4) colloid breakage of the fracturing flow-back liquid. According to the method, by the use of hydroxyl iron oxide catalytic ozone which generates hydroxyl radical, the speed of oxidizing organic colloid broken bonds in the fracturing flow-back liquid is higher; the system takes clean ozone as a raw material, so that no secondary pollution is caused; as the catalyst is a surface-hydroxylated iron oxide passivation layer, the useamount of the catalyst is small, and only a little of iron mud is produced; the degradable removal rate of organic matters oxidized for two hours can be 60 percent; the oxidization effect is doubled when compared with the direct oxidization effect of ozone.

Description

technical field [0001] The invention relates to the field of production sewage treatment in the petroleum industry, in particular to a method for degelling fracturing flowback fluid based on a γ-iron oxyhydroxide catalyzed ozone advanced oxidation system. Background technique [0002] Fracturing technology is often used in the process of oil extraction. After the fracturing is completed, a large amount of fracturing flowback fluid containing colloid will be discharged. The viscosity is high and the treatment is difficult. It must be broken first. The current oxidative gel-breaking systems for fracturing flowback fluids include: [0003] Photocatalytic oxidation system: O 3 / UV system, TiO 2 / UV system, but due to the limitation of the reaction conditions, a variety of aromatic organic intermediates will be produced when the photochemical method is used to treat organic matter, resulting in incomplete degradation of organic matter, which has become a problem that needs to b...

Claims

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Application Information

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IPC IPC(8): C02F1/78C02F103/16
CPCC02F1/78C02F2103/16C02F2305/023
Inventor 贾巧冯海波杨加平江明吴华
Owner CHENGDU EN SHAIN TECH INC
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