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Treatment method of shale gas fracturing flowback liquid

A treatment method and flowback liquid technology, which can be used in sludge treatment, water/sewage treatment, aerobic process treatment, etc., and can solve problems such as surface water pollution, deterioration of well site environment, and ecological environment damage

Active Publication Date: 2016-06-01
博慧检测技术(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If shale gas fracturing flowback fluid is not treated in time or disposed of improperly, it will not only cause waste of water resources, but also cause pollution of surface water in the construction area, and even damage to the ecological environment.
In addition, the volatile components in the flowback fluid will also pollute the atmospheric environment, and even produce stench and deteriorate the well site environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The appearance of the flowback liquid is dark green, with floating oily substances on the surface and high suspended solids. The pH value is 7.62 after testing, and the COD Cr It is 15118mg / L, TDS is 13823mg / L, SS is 2030mg / L, total alkalinity (as CaCO 3 Count) is 1304mg / L.

[0062] The gradient ozone catalytic oxidation reaction device includes three oxidation towers, which are respectively named as the first oxidation tower, the second oxidation tower and the third oxidation tower according to the sequence in which the flowback liquid flows through.

[0063] (1) Add polyaluminum chloride to the flowback liquid through a metering pump, so that the concentration of polyaluminum chloride reaches 3000mg / L, stir at a speed of 300 rpm for 1 minute, then add CPAM, and the molecular weight is 1000 10,000-20 million polyacrylamide; the concentration of CPAM is 15 mg / L, and the concentration of polyacrylamide with a molecular weight of 10 million-20 million is 5 mg / L. Continue...

Embodiment 2

[0069] The appearance of the flowback liquid is grayish brown, with floating oil-like substances on the surface, and high suspended solids. The pH value is 8.25 after testing, and the COD Cr It is 4890mg / L, TDS is 12197mg / L, SS is 1330mg / L, total alkalinity (as CaCO 3 Count) is 978mg / L.

[0070] The gradient ozone catalytic oxidation reaction device includes three oxidation towers, which are respectively named as the first oxidation tower, the second oxidation tower and the third oxidation tower according to the sequence in which the flowback liquid flows through.

[0071] (1) Add polyaluminum ferric chloride to the flowback liquid through a metering pump, so that the concentration of polyaluminum ferric chloride reaches 1000 mg / L, stir at 250 rpm for 1.5 minutes, add CPAM, and molecular weight 10 million-20 million polyacrylamide; the concentration of CPAM is 3 mg / L, the concentration of polyacrylamide with a molecular weight of 10 million-20 million is 2 mg / L, and after sti...

Embodiment 3

[0077] The appearance of the flowback liquid is milky white, there is no floating oily substance on the surface, and the suspended solids are low. The pH value is 8.63 after testing, and the COD Cr It is 3450mg / L, TDS is 6197mg / L, SS is 253mg / L, total alkalinity (as CaCO 3 Count) is 378mg / L.

[0078] The gradient ozone catalytic oxidation reaction device includes three oxidation towers, which are respectively named as the first oxidation tower, the second oxidation tower and the third oxidation tower according to the sequence in which the flowback liquid flows through.

[0079] (1) Add polyferric sulfate to the flowback liquid through a metering pump, so that the concentration of polyferric sulfate reaches 2000mg / L, stir at a speed of 150 rpm for 2 minutes, then add APAM, and the molecular weight is 10 million- 20 million polyacrylamide; the concentration of APAM is 30mg / L, the concentration of polyacrylamide with a molecular weight of 10 million-20 million is 20mg / L, continu...

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Abstract

The embodiment of the invention discloses a treatment method of shale gas fracturing flowback liquid.The method comprises the steps that when the pH value of the shale gas fracturing flowback liquid is 5-10, an inorganic coagulant is added to the shale gas fracturing flowback liquid, stirring is conducted, a first organic coagulant and a second organic coagulant are added, stirring is continuously conducted, standing settling is conducted, filtering is conducted, and coagulation supernatant and a coagulation sediment are obtained; the pH value of the coagulation supernatant is adjusted to be 7-9 and then introduced into a gradient ozone catalytic oxidation device for gradient ozone catalytic oxidation treatment; oxidized waste liquid is treated through a biological aerated filter treatment technology; biological treatment liquid is subjected to adsorption and filtration treatment and UV sterilization treatment and then discharged; the coagulation sediment is subjected to solid-liquid separation treatment, filtrate returns back to the step for circulation treatment, and a filter cake is subjected to solidification and stabilization treatment.By means of the treatment method of the shale gas fracturing flowback liquid, pollution of the shale gas fracturing flowback liquid is removed, the treated shale gas fracturing flowback liquid meets the emission standard, the filter cake can be backfilled or be used for paving after being treated, and resource utilization of waste materials is achieved.

Description

technical field [0001] The invention relates to the technical 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 mud 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] Although shale gas is a clean energy source, its extraction process has greater environmental risks than conventional oil and gas extraction. When hydraulic fracturing technology is used to exploit shale gas, about 15% to 75% of the fracturing fluid will flow back with the shale gas. After gas-liquid separation, the flowback fluid is temporarily stored ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F11/00C02F103/10
CPCC02F1/283C02F1/32C02F1/5236C02F1/56C02F1/66C02F1/722C02F1/725C02F1/76C02F1/763C02F1/78C02F3/02C02F9/00C02F11/008C02F2103/10
Inventor 乔瑞平耿翠玉陈广升蒋玮
Owner 博慧检测技术(北京)有限公司
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