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A treatment method for shale gas fracturing flowback fluid

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: 2018-01-05
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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  • A treatment method for shale gas fracturing flowback fluid

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Embodiment 1

[0047] Shale gas fracturing flowback fluid 1000mL, dark green in appearance, with oil-like substances on the surface, high suspended solids, pH value 7.62, COD Cr It is 15118mg / L, TDS is 13823mg / L, SS is 2030mg / L, total alkalinity (as 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 gas-water ratio to 3:1, adjust the bubble particle size to 30 μm, and add 350 mg of polyaluminum chloride at the same time, at 150 rpm After stirring at a speed of 1 minute, add 8 mg CPAM and 2 mg APAM with a relative molecular mass of 10 million to 20 million Daltons, continue stirring at a speed of 150 rpm for 1 minute, and then reduce the speed to 35 rpm. After stirring for 30 minutes, stop the dissolved air flotation and stirring, let it settle for 30 minutes, and obtain the first effluent 850mL and the first mud;

[0049] 2), use 0.01mol / L sulfuric acid to adjust the pH value of the firs...

Embodiment 2

[0054] Shale gas fracturing flowback fluid 1000mL, dark green in appearance, with oil-like substances on the surface, high suspended solids, pH value 7.62, COD Cr It is 15118mg / L, TDS is 13823mg / L, SS is 2030mg / L, total alkalinity (as CaCO 3 Count) is 1304mg / L.

[0055] 1) Keep the pH value of the fracturing flowback fluid unchanged, carry out dissolved air flotation treatment, adjust the gas-water ratio to 3:1, adjust the bubble particle size to 30 μm, and add 500 mg of polyaluminum sulfate at the same time, at 150 rpm After stirring at a speed of 1 minute, add 15 mg CPAM and 5 mg APAM with a relative molecular mass of 10 million to 20 million Daltons, continue stirring at a speed of 100 rpm for 1 minute, reduce the speed to 35 rpm, and stir After 30 minutes, stop the dissolved air flotation and stirring, let it settle for 30 minutes, and obtain the first effluent 880mL and the first mud;

[0056] 2), use 0.1mol / L sulfuric acid to adjust the pH value of the first effluent t...

Embodiment 3

[0061] Shale gas fracturing flowback fluid 1000mL, the appearance is taupe, with oil-like substances on the surface, high suspended solids, pH value 8.25, COD Cr It is 4890mg / L, TDS is 12197mg / L, SS is 1330mg / L, total alkalinity (as CaCO 3 Count) is 978mg / L.

[0062] 1) Keep the pH value of the fracturing flowback fluid unchanged, carry out dissolved air flotation treatment, adjust the gas-water ratio to 3:1, and adjust the bubble particle size to 30 μm. After stirring at a speed of 150 rpm for 3 minutes, add 20 mg of CPAM and 5 mg of APAM with a relative molecular mass of 10 million to 20 million Daltons, and continue stirring at a speed of 150 rpm for 1 minute, then reduce the speed to 50 rpm , after stirring for 15 minutes, stop the dissolved air flotation and stirring, let it settle for 30 minutes, and obtain 860mL of the first water outlet and the first mud outlet;

[0063] 2), use 0.02mol / L sulfuric acid to adjust the pH value of the first effluent to 3.0, send it into...

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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 treatment method for shale gas fracturing flowback fluid. Background technique [0002] Shale gas refers to unconventional natural gas that occurs in organic-rich shale and its interlayers, mainly in the form of adsorption and free, and 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., and has a wide range of uses. [0003] Since shale gas is trapped in dense shale or mudstone with few pores and fractures, it is necessary to artificially fracture the formation to form long fractures when exploiting it, and support the fractures to form channels to keep the gas The pressure flows continuously into the wellbore. This hydraulic fracturing technology consumes a lot of water resources when ...

Claims

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Application Information

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Patent Type & Authority Patents(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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