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Method and device for processing polymer-contained waste liquid and fracturing flow-back fluid

A fracturing flowback fluid and treatment method technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Reuse and re-injection, adverse effects of dosing agents, etc., to achieve the effect of convenient equipment processing and transportation, realizing waste liquid resource utilization, and saving transportation

Active Publication Date: 2015-06-17
BEIJING OTC ENERGY & ENVIRONMENT ENGINEERING PUBLIC LIMITED COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some chemicals can effectively separate oil and water and remove harmful substances when treating waste liquid, they also have safety problems and side effects. Reduce the viscosity of the waste liquid, ensure subsequent coagulation and precipitation, and effectively purify the waste liquid through the equipment. However, these two waste liquids are dangerous chemicals, especially sulfuric acid, which not only have adverse effects on the dosing agent, but also easily cause safety hazards. Accidents; in the face of remote wellhead waste liquid treatment, transportation is inconvenient; when the amount of strong acid is not strictly controlled, it is easy to cause equipment corrosion
In addition, the compound formula flocculant, coagulant and other agents commonly used in oil and gas fields can effectively separate suspended solids and oil in waste liquid, but equipped with conventional separators, such as walnut shell filter or quartz sand filter, to separate harmful substances It is easy to block the filler, resulting in an increase in the frequency of equipment cleaning and filler replacement; when the dosage of chemicals is not controlled properly, it is easy to increase some ions in the water body, which directly affects the secondary reuse and reinjection of waste liquid

Method used

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  • Method and device for processing polymer-contained waste liquid and fracturing flow-back fluid
  • Method and device for processing polymer-contained waste liquid and fracturing flow-back fluid
  • Method and device for processing polymer-contained waste liquid and fracturing flow-back fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] like figure 1 As shown, it is a schematic diagram of the treatment device for polymer-containing waste fluid and fracturing flowback fluid provided in this example. As can be seen from the figure, the treatment device consists of a lift pump 1, an ultrasonic generator 9, an ozone generator 8, a sewage reaction tank 2, a multi-media activated carbon device 3, an aeration device 7, a secondary lift pump 4, and a pipeline mixing device 5, dosing device 11 and coagulation-filtration-precipitation integrated device 6, the sewage reaction tank 2, multi-media activated carbon device 3 and coagulation-filtration-precipitation integrated device 6 are connected in sequence through pipelines, and the The ultrasonic generator 9 is placed next to the sewage reaction tank 2, the ozone generator 8 is placed in the sewage reaction tank 2, the carrier activated carbon catalyst is fixed in the multi-media activated carbon device 3, and the aeration device 7 is placed in the At the botto...

Embodiment 2

[0037] The processing device is as described in Example 1.

[0038] Fracturing fluid treatment volume 1m 3 / h, influent water quality: water temperature 48°C, pH=8.6, oil content 532mg / L, COD 4562mg / L, suspended matter: 611mg / L. The treatment method is as follows: the ultrasonic frequency in the sewage reaction tank is controlled at 23kHz, the dosage of ozone is 12mg / L, and the residence time is 30min; the dosage of the catalyst (copper-loaded activated carbon) in the multi-media activated carbon device is 0.6m 3 , the aeration is controlled at an air-to-water ratio of 32:1. Coagulation-sedimentation-filtration integrated device front-end agent dosage is: organic polymer flocculant (polymer polyacrylamide) is 80mg / L, water purifier (OTC-A) is 65mg / L, coagulant aid ( Cationic polyacrylamide) is 0.5mg / L. The working time of the device is 52min. The effluent reaches the standard of "Methods for Performance Evaluation of Water-Based Fracturing Fluids" (SY / T5107-2005).

[0039...

Embodiment 3

[0044] The processing device is as described in Example 1.

[0045] Polymerized sewage treatment capacity 1m 3 / h, influent water quality: water temperature 45°C, pH=8.9, oil content 567mg / L, COD 5279mg / L, suspended matter: 598mg / L. The specific treatment method is that the ultrasonic frequency in the sewage reaction tank is controlled at 25kHz, the dosage of ozone is 14.5mg / L, and the residence time is 30min; the dosage of cobalt-loaded activated carbon in the multi-media activated carbon device is 0.65m 3 , Aeration is controlled at an air-to-water ratio of 35:1. Coagulation-sedimentation-filtration integrated device front-end agent dosage is: organic polymer flocculant (acrylamide and dimethylaminoethyl methacrylate copolymer) is 75mg / L, water purifier (OTC-B) is 55mg / L, coagulant aid (anionic polyacrylamide) is 1mg / L. The working time of the device is 48min. The effluent meets the standards of SYT 5329-2012 Recommended Indexes and Analysis Methods for Injection Water Q...

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Abstract

The invention discloses a method and a device for processing a polymer-contained waste liquid and a fracturing flow-back fluid. The processing method comprises the following steps: 1) performing ultrasonic ozonization treatment on the polymer-contained waste liquid and the fracturing flow-back fluid; 2) performing catalysis and oxidation treatment on the waste liquid after the ultrasonic ozonization treatment; 3) coagulating, settling and filtering the waste liquid after the catalysis and oxidation treatment to obtain the liquid conforming to the water-based fracturing liquid blending standard and the reinjection water standard. The device mainly comprises an ultrasonic ozonization unit, a catalysis and oxidation unit, a dosing unit and a coagulating-settling-filtering unit, which are sequentially connected. The processing method is simple, the device is practical, the dosing system is relatively safe, so that oil, suspensions and other hazardous substances can be efficiently separated from water under the packless situation, and the waste liquid can be recycled.

Description

technical field [0001] The invention relates to the technical field of refractory waste liquid treatment in oil fields, gas fields, shale gas and other oil and gas fields, in particular to a method and device for treating waste liquid containing polymer and fracturing flowback liquid. Background technique [0002] Oilfield refractory waste fluids mainly include drilling fluid, fracturing fluid, polymer-containing waste fluid, well washing fluid, etc. Taking fracturing fluid and polymer-containing sewage as examples, the waste fluid is mainly characterized by high viscosity and the stability of colloidal particles in water. Strong, natural degradation is not easy; waste liquid has high oil content, strong emulsification stability, and oil-water separation is not easy; it belongs to the "three high wastewater" with high COD, high turbidity, and high salt content. [0003] For this kind of refractory waste liquid, the conventional coagulation-sedimentation-filtration process ha...

Claims

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Application Information

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IPC IPC(8): C02F9/08
Inventor 陈茗宫传奇张勇张余凯
Owner BEIJING OTC ENERGY & ENVIRONMENT ENGINEERING PUBLIC LIMITED COMPANY
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