Direct discharge treatment method for high-salinity fracturing flow-back fluid

A fracturing flowback fluid and treatment method technology, applied in mining wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve problems such as poor treatment effect and secondary pollution treatment costs

Pending Publication Date: 2021-11-02
三桶油环保科技(宜兴)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of poor treatment effect, easy to cause secondary pollution and high treatment cost when using a single method to deal with fracturing flowback fluid at present, and to provide a direct drainage system for high salinity fracturing flowback fluid. Approach

Method used

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  • Direct discharge treatment method for high-salinity fracturing flow-back fluid
  • Direct discharge treatment method for high-salinity fracturing flow-back fluid
  • Direct discharge treatment method for high-salinity fracturing flow-back fluid

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specific Embodiment approach 1

[0017] Specific implementation mode 1: In this implementation mode, a direct discharge treatment method of high-salinity fracturing flowback fluid is carried out according to the following steps:

[0018] The fracturing flowback fluid is subjected to the first-level electrocatalytic oxidation treatment and the second-level electrocatalytic oxidation treatment in sequence to obtain the fracturing flowback fluid after the electrocatalytic oxidation treatment, and the fracturing flowback fluid after the electrocatalytic oxidation treatment is subjected to BESI biological treatment to obtain the fracturing flowback fluid after BESI biological treatment, and then add fracturing fluid digestion agent to the fracturing flowback fluid after BESI biological treatment, and react for 20-50 minutes to obtain the fracturing flowback fluid after chemical treatment The dosing amount of the fracturing fluid digestion agent is 10-40mg / L; then the fracturing flowback fluid after the chemical tre...

specific Embodiment approach 2

[0027] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that when the fracturing flowback fluid is subjected to the first-level electrocatalytic oxidation treatment and the second-level electrocatalytic oxidation treatment, the air flotation treatment is carried out at the same time, and the water that rises to the fracturing is removed. Oil droplets on the surface of the flowback fluid.

[0028] Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0029] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the sulfur electron acceptor is sodium sulfate, sodium sulfite or sodium thiosulfate.

[0030] Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a direct discharge treatment method for high-salinity fracturing flow-back fluid, and relates to the technical field of oilfield sewage treatment. The invention aims to solve the problems that the treatment effect is poor, secondary pollution is easily caused and the treatment cost is high when the fracturing flow-back fluid is treated by adopting a single method at present. The method comprises the following steps: sequentially carrying out electrocatalytic oxidation treatment on the fracturing flow-back fluid to obtain the fracturing flow-back fluid subjected to electrocatalytic oxidation treatment, carrying out BESI biological treatment to obtain the fracturing flow-back fluid subjected to BESI biological treatment, then adding a fracturing fluid digesting agent, and performing reacting to obtain the fracturing flow-back fluid subjected to dosing treatment; carrying out ozone catalytic oxidation to obtain the fracturing flow-back fluid subjected to ozone catalytic oxidation, adding hydrogen peroxide and the silicon-aluminum carrier ozone catalytic filler during ozone catalytic oxidation, and finally carrying out two-stage filtration on the fracturing flow-back fluid subjected to ozone catalytic oxidation to complete direct discharge treatment of the high-salinity fracturing flow-back fluid. The direct discharge treatment method for the high-salinity fracturing flow-back fluid can be obtained.

Description

technical field [0001] The invention relates to the technical field of oilfield sewage treatment, in particular to a method for direct discharge treatment of high salinity fracturing flowback fluid. Background technique [0002] At present, many oil fields in my country are oil and gas reservoirs with low porosity and low permeability, and fracturing operation is an important measure to increase production in low permeability oil fields. Fracturing flowback fluid is the waste fluid returned to the ground after the fracturing operation is completed, and it is one of the main pollution sources of oilfield water pollution. Due to the addition of many chemical additives in the fracturing process, the composition of the fracturing flowback fluid is complex and has the characteristics of high viscosity, high COD, high oil content, high chroma and high suspended solid content. If these waste fluids cannot be obtained Effective treatment will cause serious pollution to water bodies...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/10
CPCC02F9/00C02F2103/10C02F1/725C02F1/40C02F1/24C02F1/78C02F1/001C02F1/76C02F1/722C02F3/301C02F3/34
Inventor 魏利魏东张昕昕李春颖欧阳嘉骆尔铭
Owner 三桶油环保科技(宜兴)有限公司
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