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Fracturing flow-back fluid treatment method

A technology of fracturing flowback fluid and treatment method, which is applied in the fields of filtration treatment, sedimentation treatment, mining wastewater treatment, etc., and can solve the problem of long treatment time of microbial anaerobic or aerobic methods, large dosage of chemicals, secondary pollution, etc. problems, to achieve the effect of overcoming large sludge production, realizing flocculation and sedimentation, and reducing costs

Inactive Publication Date: 2022-05-06
北京国海能源技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods alone cannot achieve the optimal treatment effect, so there are many combined methods of related processes in China
At present, domestic oil and gas field fracturing flowback fluid treatment technologies more or less have some defects, such as the chemical method consumes a lot of chemicals, the treatment cost is high, and it is easy to cause secondary pollution; the microbial anaerobic or aerobic method takes a long time and the control factors Complex, need to be combined with biodegradable flocculants to avoid secondary pollution of sludge, etc.
These methods or processes generally have defects such as large dosage of chemicals, high treatment cost, large equipment investment, complex process and inconvenient operation, large amount of sludge generation, and easy to produce secondary pollution.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0028] A treatment method for fracturing flowback fluid, the treatment method comprising the steps of:

[0029] 1) Pretreatment: under stirring conditions, add the oxidized flocculant potassium ferrate: 0.05% to the flowback liquid, keep stirring for 10 minutes, then let it stand for flocculation and precipitation;

[0030] 2) Electrochemical degradation treatment: the effluent after the pretreatment of the flowback liquid flows into the electrochemical process, adjusts the voltage and current, and controls the current density at 5mA / cm 2 Perform electrochemical degradation treatment;

[0031] 3) Electrochemical removal of heavy metal treatment: the electrochemical degradation treatment effluent flows through the heavy metal removal treatment process, the voltage and current are adjusted, and the current density is controlled at 15mA / cm 2 , carry out heavy metal removal treatment;

[0032] 4) Filtration treatment: the above-mentioned effluent after heavy metal removal treatm...

Embodiment 2

[0037] A treatment method for fracturing flowback fluid, the treatment method comprising the steps of:

[0038] 1) Pretreatment: under stirring conditions, add the oxidized flocculant potassium ferrate: 0.25% to the flowback liquid, keep stirring for 20 minutes, then let it stand for flocculation and precipitation;

[0039] 2) Electrochemical degradation treatment: the effluent after the pretreatment of the flowback liquid flows into the electrochemical process, adjusts the voltage and current, and controls the current density at 15mA / cm 2 Perform electrochemical degradation treatment;

[0040] 3) Electrochemical removal of heavy metal treatment: the electrochemical degradation treatment effluent flows through the heavy metal removal treatment process, and the voltage and current are adjusted to control the current density at 20mA / cm 2 , carry out heavy metal removal treatment;

[0041] 4) Filtration treatment: the above-mentioned effluent after heavy metal removal treatment...

Embodiment 3

[0046] A treatment method for fracturing flowback fluid, the treatment method comprising the steps of:

[0047] 1) Pretreatment: under stirring conditions, add oxidized flocculant potassium permanganate: 0.5% to the flowback liquid, keep stirring for 30 minutes, then let it stand for flocculation and precipitation;

[0048] 2) Electrochemical degradation treatment: the effluent after pretreatment of the flowback liquid flows into the electrochemical process, adjusts the voltage and current, and controls the current density at 20mA / cm 2 Perform electrochemical degradation treatment;

[0049] 3) Electrochemical removal of heavy metal treatment: the electrochemical degradation treatment effluent flows through the heavy metal removal treatment process, and the voltage and current are adjusted to control the current density at 25mA / cm 2 , carry out heavy metal removal treatment;

[0050] 4) Filtration treatment: the above-mentioned effluent after heavy metal removal treatment flo...

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Abstract

The invention relates to a fracturing flow-back fluid treatment method. The treatment method comprises the following steps: pretreatment: adding a certain amount of an oxidation flocculant into a flow-back fluid to carry out gel breaking, chain scission and flocculation separation; electrochemical treatment: carrying out electrochemical treatment on the pretreated effluent through an electrochemical treatment procedure; the electrochemical treatment procedure comprises two sub-procedure processes of electrochemical degradation and electrochemical heavy metal removal; filtering: enabling the electrochemical treatment effluent to flow through a multi-stage filter, and filtering; the treatment method has the advantages of simple flow, short process, less sludge output, low operation cost and good purification effect.

Description

technical field [0001] The invention relates to a treatment method for fracturing flowback fluid, belonging to the technical field of sewage treatment. Background technique [0002] Fracturing is one of the main measures for oil and gas well stimulation and water well injection. After the fracturing operation is completed, the waste fluid discharged back contains a large amount of vegetable gum or high molecular polymer, formaldehyde, petroleum, metal ions and other various additives. If the fracturing flowback fluid is directly discharged outside, it will cause damage to the surrounding area. The environment, especially crops and surface water systems, cause great pollution. [0003] Conventional fracturing flowback fluid treatment methods include flocculation sedimentation method, biochemical method, advanced oxidation technology and micro-electrolysis combined process. These methods alone cannot achieve the optimal treatment effect, so there have been many combined meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F101/20C02F101/32C02F103/10
CPCC02F9/00C02F2103/10C02F1/5236C02F2001/007C02F1/46C02F1/001C02F2101/20C02F2209/08C02F2209/10C02F2101/32C02F2101/16
Inventor 张春雨姚佩锋
Owner 北京国海能源技术研究院
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