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Shale gas fracturing outlet liquid treatment method

A treatment method and flowback liquid technology, applied in the direction of filtration treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of cumbersome operation and complicated treatment process, and achieve the effect of simple process flow and convenient operation

Active Publication Date: 2016-04-13
POTEN ENVIRONMENT GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention discloses a treatment method for shale gas fracturing flowback fluid, which is used to solve the problems in the prior art that the treatment process of shale gas fracturing flowback fluid is complicated and the operation is cumbersome

Method used

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  • Shale gas fracturing outlet liquid treatment method

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Effect test

Embodiment 1

[0047] Shale gas pressure fracturing flowback fluid 1000mL, the appearance is dark green, there are oily substances on the surface, high suspended solids, pH 7.62, COD Cr Is 15118mg / L, TDS is 13823mg / L, SS is 2030mg / L, total alkalinity (in CaCO 3 Count) is 1304mg / L.

[0048] 1). Keep the pH value of the fracturing flowback fluid unchanged, perform dissolved air flotation treatment, adjust the air-water ratio to 3:1, adjust the bubble size to 30μm, and add 350mg of polyaluminum chloride at 150 revolutions / After stirring for 1 minute, add 8mg CPAM and 2mg APAM with a relative molecular mass of 10 to 20 million Daltons, continue to stir at 150 rpm for 1 minute, reduce the rotating speed to 35 rpm, stir After 30 minutes, stop the dissolved air flotation and stirring, and let stand for 30 minutes to obtain the first effluent water and the first mud;

[0049] 2) Adjust the pH of the first effluent to 3.0 with 0.01mol / L sulfuric acid, and send it to the catalytic oxidation reactor for ca...

Embodiment 2

[0054] Shale gas pressure fracturing flowback fluid 1000mL, the appearance is dark green, there are oily substances on the surface, high suspended solids, pH 7.62, COD Cr Is 15118mg / L, TDS is 13823mg / L, SS is 2030mg / L, total alkalinity (in CaCO 3 Count) is 1304mg / L.

[0055] 1). Keep the pH value of the fracturing flowback fluid unchanged, perform dissolved air flotation treatment, adjust the air-water ratio to 3:1, adjust the bubble size to 30μm, and add 500mg of polyaluminum sulfate at 150 rpm After stirring for 1 minute, add 15mg CPAM and 5mg APAM with a relative molecular mass of 10 to 20 million Daltons, continue to stir at 100 rpm for 1 minute, reduce the rotating speed to 35 rpm, and stir for 30 Minutes later, stop dissolved air flotation and stirring, and let stand for 30 minutes to obtain the first effluent water and sludge;

[0056] 2) Adjust the pH of the first effluent to 3.0 with 0.1 mol / L sulfuric acid and send it to the catalytic oxidation reactor for catalytic oxida...

Embodiment 3

[0061] Shale gas pressure fracturing flowback fluid 1000mL, the appearance is gray-brown, there are oily substances on the surface, the suspended solids are relatively high, the pH value is 8.25, COD Cr Is 4890mg / L, TDS is 12197mg / L, SS is 1330mg / L, total alkalinity (in CaCO 3 Count) is 978mg / L.

[0062] 1) Keep the pH value of the fracturing flowback fluid unchanged, perform dissolved air flotation treatment, adjust the gas-water ratio to 3:1, adjust the bubble size to 30μm, and add 800mg of polyaluminum ferric chloride at 150 revolutions After stirring for 3 minutes at the speed of rotation per minute, add 20 mg CPAM and 5 mg of APAM with a relative molecular mass of 10 million to 20 million daltons. After stirring at 150 rpm for 1 minute, reduce the rotation speed to 50 rpm. After stirring for 15 minutes, stop the dissolved air flotation and stirring, and let it settle for 30 minutes to obtain 860 mL of first effluent and first sludge;

[0063] 2) Adjust the pH of the first effl...

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Abstract

The embodiment of the invention discloses a shale gas fracturing outlet liquid treatment method which comprises the following steps: step (1), after regulating the pH value of the shale gas fracturing outlet liquid to be 5-10, performing dissolved air flotation treatment, adding an inorganic coagulant, stirring, further adding an organic flocculant and PAM with the relative molecular mass being 10 million to 20 million Da, stirring, leaving to stand, so as to obtain first effluent water and first outlet sludge; step (2), regulating the pH value of the first effluent water to be 2-5, and carrying out catalytic oxidation reaction, so as to obtain second effluent water; step (3), adding an oxidizing agent into the second effluent water for reacting for 10-60 min, regulating the pH value to be 8-10.5, adding an organic flocculant or PAM with the relative molecular mass being 10 million to 20 million Da, stirring, and leaving to stand, so as to obtain third effluent water and second outlet sludge, wherein the third effluent water is cyclically utilized to prepare the fracturing outlet liquid; the second outlet sludge is mixed with the first outlet sludge, the mixed outlet sludge is filtered, the filtrate is sent back to the step (1) for treatment, and a curing agent is added into the precipitate for solidification and stabilization treatment. The method is simple in process, and realizes maximum utilization of resources.

Description

Technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a shale gas pressure fracturing flowback liquid treatment method. Background technique [0002] Shale gas refers to the unconventional natural gas that occurs in organic-rich mud shale and its interlayers. It mainly exists in adsorption and free states. It is mainly composed of methane. It is a clean and efficient energy resource and chemical raw material. . Shale gas is mainly used for residential gas, urban heating, power generation, automobile fuel and chemical production, etc., with a wide range of uses. [0003] Since shale gas is trapped in dense shale or mudstone with almost no pores and cracks, it must be artificially fractured to form long cracks when it is mined, and the cracks are supported to form channels to keep the gas Pressure continuously flows into the wellbore. This kind of hydraulic fracturing technology requires a lot of water resources when configu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/10
CPCC02F1/001C02F1/24C02F1/56C02F1/725C02F9/00C02F2103/10C02F2301/08
Inventor 乔瑞平耿翠玉陈广升蒋玮
Owner POTEN ENVIRONMENT GRP
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