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Harmless treatment system and method of fracturing return liquid

A technology for harmless treatment of fracturing flowback fluid, which is applied in chemical instruments and methods, oxidized water/sewage treatment, mining wastewater treatment, etc. Unstable treatment effect and other problems, to achieve good process treatment effect, simplify operation, and avoid long processing time

Active Publication Date: 2016-01-06
北京联众华禹环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the treatment of fracturing flowback fluid at home and abroad focuses on reuse. The fracturing flowback fluid is filtered and flocculated to remove SS and some heavy metals in the flowback fluid and then reused. However, there will still be a large amount of fracturing flowback The liquid cannot be recycled, and must be treated in a harmless manner, which increases the treatment process
Moreover, the existing harmless treatment process for fracturing flowback fluid generally involves pretreatment first, followed by biochemical treatment. Disadvantages such as large area

Method used

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  • Harmless treatment system and method of fracturing return liquid
  • Harmless treatment system and method of fracturing return liquid
  • Harmless treatment system and method of fracturing return liquid

Examples

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Embodiment 1

[0047] Add a gel-breaking flocculant to the 100L oil-gas field fracturing operation and return it to the ground. The gel-breaking flocculant is calcium oxide, aluminum sulfate, and ferrous sulfate. Liquid discharge meter, the addition of calcium oxide is 10g / L, the addition of aluminum sulfate is 2g / L, and the addition of ferrous sulfate is 8g / L. After fully stirring for 0.5-2h, the precipitation is allowed to stand for 2h. Separation, and then the supernatant overflows into the buffer tank; the effluent after the pretreatment step and the precipitation separation step is pumped out from the buffer tank through the lift pump, adjust the pH of the effluent to pH=4-6, and then add 1g of ferrous sulfate and 3ml of 30% hydrogen peroxide Fenton reagent, after the reaction time of 4 hours, adjust the pH of the effluent to 8 and undergo precipitation separation, then overflow the supernatant generated by the precipitation separation into the buffer tank; after the Fenton oxidation ste...

Embodiment 2

[0052]Add gel-breaking and flocculant agents to the 250L oil and gas field fracturing operation and return to the ground. The gel-breaking and flocculant is calcium oxide, aluminum sulfate, and ferrous sulfate. Calcium oxide was added in an amount of 15g / l, aluminum sulfate was added in an amount of 8g / l, and ferrous sulfate was added in an amount of 12g / l. After fully stirring for 0.5h, the precipitate was separated for 3h, and then the precipitate was separated. The supernatant produced by the separation overflows into the buffer tank; the effluent from the pretreatment step and the precipitation separation step is extracted from the buffer tank through a lift pump, and the pH of the effluent is adjusted to pH=4-6 with sulfuric acid and then under aeration conditions (50L / h) Carry out iron-carbon micro-electrolytic oxidation treatment for 1 hour, use 15% sodium hydroxide solution to adjust the pH of the reaction effluent to 9, then precipitate and separate for 3 hours, then ...

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Abstract

The invention discloses a harmless treatment system of fracturing return liquid. The system comprises a pretreatment unit, a primary oxidation unit, an inert coordinated electrolysis advanced oxidation unit and an activated carbon adsorption unit which are sequentially arranged, wherein the pretreatment unit comprises a first reaction tank, a settling separation tank, and a first buffer tank; the primary oxidation unit comprises a Fenton reaction unit and / or a ferrocarbon microelectrolysis reaction unit, and a second reaction tank is arranged in each of the Fenton reaction unit and the ferrocarbon microelectrolysis reaction unit; the inert coordinated electrolysis advanced oxidation unit comprises a filter, an electrolysis oxidation tank and a circulating tank connected by pipelines, and an oxygen-containing gas is introduced to the circulating tank; and the activated carbon adsorption unit is filled with activated carbon. In addition, the invention also discloses a method for carrying out harmless treatment on fracturing return liquid by using the system. The system and method have the characteristics of low equipment operation cost, high treatment efficiency, and stable treatment effect, and can be used for achieving harmless treatment of the fracturing return liquid.

Description

technical field [0001] The invention relates to a wastewater treatment technology, in particular to a harmless treatment system and method for fracturing flowback fluid produced in the development of oil and gas fields, and belongs to the field of environmental protection water treatment. Background technique [0002] Hydraulic fracturing technology is an important measure to increase production in oil and gas fields. In the process of hydraulic fracturing construction, 10-40% of the fracturing fluid will flow back to the ground. The fracturing fluid contains various chemical substances such as guar gum, petroleum and its additives, and has high COD, high Stability, high viscosity and other characteristics. Since some substances in the fracturing fluid are toxic and radioactive, if they are not treated or handled properly after being discharged to the ground, they will inevitably have a non-negligible impact on the surrounding environment, especially the soil, surface water...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F103/10C02F1/72C02F1/52C02F1/66C02F1/28
Inventor 李辉姚佐国林坤堂于勇勇刘小见樊晓丽
Owner 北京联众华禹环保科技有限公司