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Method for treating backflow fracturing fluid

A technology for fracturing flowback fluid and treatment methods, which is applied in filtration treatment, multi-stage water treatment, water/sewage treatment, etc., and can solve problems such as complex control factors, complex components of fracturing flowback fluid, and secondary pollution. Achieve the effects of reducing costs, reducing the risk of secondary pollution, and reducing viscosity

Inactive Publication Date: 2016-12-21
INST OF SINOPEC OILFIELD EQUIP CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the current domestic guar gum fracturing flowback fluid treatment technology has reached a certain level, there are more or less defects. Chemical agents have high processing costs and are likely to cause secondary pollution; microbial anaerobic or aerobic fermentation methods have low energy consumption, low processing costs, and can play a role in sterilization, but the processing time is long and the control factors are relatively complicated. Combined with biodegradable flocculants to avoid secondary pollution of sludge; the existing treatment methods and process flow are relatively fixed, but the composition of fracturing flowback fluid is complex and the system is changeable, so it is difficult to ensure that the treated flowback fluid can effectively reach National related discharge or reuse standards

Method used

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  • Method for treating backflow fracturing fluid
  • Method for treating backflow fracturing fluid
  • Method for treating backflow fracturing fluid

Examples

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Effect test

Embodiment 1

[0032] This embodiment is used to treat the fracturing flowback fluid of the hydroxypropyl guar gum system produced in the stimulation operation of offshore oil wells. Capacity: 20m 3 / h, influent water quality: PH=7.5, suspended matter in water is 893mg / L, COD is 3700mg / L, the treatment method is:

[0033] 1) The fracturing flowback fluid is subjected to ozone oxidation gel breaking treatment, which is used to reduce the viscosity of the fluid inlet port, alleviate the re-intervention of chemically soluble interference ions in the flowback fluid, and reduce the risk of secondary pollution. Among them, the ozone gas in the ozone oxidation gel breaking treatment is in the form of nano-sized microbubbles to improve the oxidation speed and oxidation efficiency. In the ozone gel breaking reaction, the ozone concentration is 50 mg / L, and the ozone gel breaking reaction time is 5 minutes.

[0034] The principle of ozone breaking reaction is:

[0035] o 3 +OH - →HO 2 ·+·O 2

...

Embodiment 2

[0057] This embodiment is used to treat the fracturing flowback fluid of the slippery water system that does not require oxidation and gel breaking treatment. Capacity: 20m 3 / h, influent water quality: PH=6.9, suspended matter in water is 1000mg / L, COD is 2702.3mg / L, the operation steps are:

[0058] 1) Pump the slick water fracturing flowback fluid into the chemical flocculation unit, and the chemical flocculation uses flocculants and coagulants. The flocculant is selected from inorganic polymer flocculant solution, and the inorganic polymer flocculant solution is at least one of polyaluminum chloride, polyaluminum sulfate, polyferric sulfate, polyferric chloride and polyferric sulfate; coagulant polyacrylamide Solution; the dosage of flocculant is 1500mg / L, and the dosage of coagulant is 15mg / L; then it enters the electroflocculation reaction unit, and the suspended particles and colloidal pollutants in it lose stability under the action of electric field and combine with ...

Embodiment 3

[0065] This embodiment is used to treat the fracturing flowback fluid of the slippery water system that does not require oxidation and gel breaking treatment. Capacity: 20m 3 / h, influent water quality: PH=6.9, suspended matter in water is 1000mg / L, COD is 2702.3mg / L, the operation steps are:

[0066] 1) Pump the slick water fracturing flowback fluid into the electrocoagulation reaction unit, the suspended particles and colloidal pollutants in it lose stability under the action of the electric field and combine with the micro flocculant to form large flocs. The electrocoagulation reaction time is 4 minutes ;

[0067] 2) After the liquid treated in step 1 is mixed with dissolved air water, it enters the air flotation settling tank, the air-water mixing ratio is 5%, and the air flotation reaction time is 10 minutes; the settling tank is connected with the centrifugal desolidification device for flocculation After the sedimentation, the treatment liquid is discharged into the s...

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Abstract

The invention discloses a method for treating backflow fracturing fluid. The method is characterized by comprising steps of carrying out electric flocculation on the guar gum backflow fracturing fluid; carrying out air flotation sedimentation on waste fluid obtained after electric flocculation is carried out; carrying out electrochemical advanced oxidation treatment on supernatant fluid obtained after air flotation sedimentation is carried out; carrying out filtration treatment on waste fluid obtained after electrochemical advanced oxidation treatment is carried out and draining the waste fluid backwardly or externally. The method has the advantages that chemical flocculation and chemical oxidation are replaced by electric flocculation and electrochemical oxidation, dissolved air flotation and filtration are carried out, accordingly, introduction and dosage of new chemical agents can be effectively reduced, secondary intervention of chemically soluble interference ions in wastewater can be relieved, and the method is beneficial to reducing secondary pollution risks and the costs; the treated backflow fracturing fluid can be recycled for preparing fracturing fluid or being injected to strata again.

Description

technical field [0001] The invention relates to the technical field of oil and gas field exploitation sewage treatment, in particular to a treatment method for fracturing flowback fluid. Background technique [0002] As an indispensable and important technical means for oil and gas field exploration and development, fracturing is mainly used to improve the permeability of oil and gas layers in low-permeability oil reservoirs and unconventional oil and gas reservoirs, to test new wells, to tap the potential of oil wells in old areas, and to increase injection of water wells, etc. After the fracturing operation is completed, the flowback fracturing fluid contains a large amount of guar gum, formaldehyde, petroleum and various additives, and the clay particles and cuttings brought out from deep in the formation make the fracturing flowback fluid have high COD, Features such as high stability, high viscosity and high turbidity, especially some hydrophilic organic additives that ...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F103/10
CPCC02F9/00C02F1/001C02F1/24C02F1/38C02F1/463C02F1/4672C02F1/52C02F1/5236C02F1/56C02F1/725C02F1/78C02F2103/10C02F2301/08
Inventor 胡琼许剑张正禄李文权刘学中
Owner INST OF SINOPEC OILFIELD EQUIP CORP
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