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A treatment method for fracturing flowback fluid

A fracturing flowback fluid and treatment method technology, applied in the fields of filtration treatment, mining wastewater treatment, chemical instruments and methods, etc., can solve the problems of high risk and high cost of fracturing flowback fluid treatment process, and achieve high safety, Great application value, the effect of water color clarification

Active Publication Date: 2022-05-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a treatment method for fracturing flowback fluid, so as to solve the problems of high cost and high risk in the treatment process of fracturing flowback fluid in the prior art

Method used

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  • A treatment method for fracturing flowback fluid
  • A treatment method for fracturing flowback fluid
  • A treatment method for fracturing flowback fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Sludge domestication process:

[0034] The thickened sludge from the sewage treatment plant in Madong area is selected as the initial seed sludge, and its moisture content is about 70% to 80%. After the concentrated sludge is diluted, coarsely filtered and washed, it is subjected to vexation until the color of the sludge changes from black to yellowish brown to obtain the vexed sludge. Part of the sludge after vexed exposure uses oilfield sewage with an oil content of less than 10 mg / L and poor biodegradability (B / C < 0.2) as wastewater, and the intermittent culture method is used to domesticate the seed sludge. After a few days, stop the aeration, let it stand still, discharge a part of the upper layer of wastewater, and inject fresh sewage. The three processes of stuffy exposure, static settling and water inflow are repeated in this way. The amount of water inflow increases each time compared with the last time, and the time of stuffy exposure is shortened. During th...

Embodiment 2

[0050] The sludge domestication process is the same as in Example 1.

[0051] The application process is as follows:

[0052] A well in the Madong area of ​​Xinjiang Oilfield obtained fracturing flowback fluid for treatment. The parameters of the flowback fluid are as follows: viscosity 8.03mPa·S, suspended solids value 3376mg / L, salinity 37142mg / L, chloride ion content 22120mg / L, COD 5241mg / L, BOD 714mg / L, pH 5.7, oil content not detected, water type is CaCl 2 .

[0053] The process is as follows:

[0054] The fracturing flowback fluid is pumped into the aeration tank through the lift pump, and the air is blown into the device, the air-water ratio is between 1.5:1 and 2.5:1, and the residence time is 1.5h;

[0055] The flowback liquid after aeration enters the buffer device, and the residence time is 2h;

[0056] The effluent from the upper part of the buffer device enters the anaerobic device, the residence time of the flowback liquid of the anaerobic device is 9h, the t...

Embodiment 3

[0065] The sludge domestication process is the same as in Example 1.

[0066] The application process is as follows:

[0067] The fracturing flowback fluid was obtained from a well in the Mazhong area of ​​Xinjiang Oilfield for treatment. The parameters of the flowback fluid are as follows: viscosity 8.03mPa·S, suspended solids value 3376mg / L, salinity 37142mg / L, chloride ion content 22120mg / L , COD 5241mg / L, BOD 714mg / L, pH 5.7, oil content not detected, water type is CaCl 2 .

[0068] The process is as follows:

[0069] The fracturing flowback fluid is pumped into the aeration tank through the lift pump, and the air is blown into the device, the air-water ratio is between 1.5:1 and 2.5:1, and the residence time is 0.5h;

[0070] The flowback liquid after aeration enters the buffer device, and the residence time is 2h;

[0071] The effluent from the upper part of the buffer device enters the anaerobic device, the residence time of the flowback liquid of the anaerobic devi...

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Abstract

The invention provides a treatment method for fracturing flowback fluid. The treatment method includes: aerating the fracturing flowback fluid in the aeration device and then standing still; making the upper effluent of the aeration device enter the anaerobic device for anaerobic treatment; making the upper effluent of the anaerobic device enter the anoxic The device performs anoxic treatment; and the upper effluent of the anoxic device enters the aerobic device for aerobic treatment. The fracturing flowback fluid is first aerated to remove reducing substances, and then undergoes anaerobic treatment, anoxic treatment, and aerobic treatment to remove biochemical substances such as organic matter, thereby reducing the viscosity of the fracturing flowback fluid. Subsequent conventional filtration and sterilization can meet the reinjection requirements. No oxidizing agent and water treatment agent are used in the above process, thus avoiding the problems of high cost and high risk of the existing process. The invention is suitable for treating the fracturing flowback fluid of the guar gum system, and the water color of the treated fracturing flowback fluid is clear and translucent without the phenomenon of color reversion.

Description

technical field [0001] The invention relates to the field of oilfield wastewater treatment, in particular to a treatment method for fracturing flowback fluid. Background technique [0002] With the continuous development of oilfields, fracturing operations are the main production method for low-permeability oilfields. However, the fracturing flowback fluid (hereinafter referred to as the flowback fluid) mainly contains pollutants such as crude oil, residual fracturing fluid, fracturing flowback fluid, and organic reducing substances, and has the characteristics of complex structure and high viscosity. [0003] For the treatment of flowback fluid, various oilfields at home and abroad have tested a variety of treatment processes. Usually the most important treatment process is the process of gel breaking and viscosity reduction of flowback fluid. At present, the process of gel breaking and viscosity reduction of flowback fluid is carried out by oxidation method. Viscosity, on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F103/10
CPCC02F3/1205C02F3/286C02F3/30C02F7/00C02F2103/10C02F1/001
Inventor 斯绍雄郭进周宫兆波王兴华王伟朱树青王雨严忠
Owner PETROCHINA CO LTD
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