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Fracturing flowback fluid treatment method

A fracturing flowback fluid and treatment method technology, applied in chemical instruments and methods, multi-stage water/sewage treatment, oxidized water/sewage treatment, etc. problem, to achieve the effect of good economy, reducing the amount of liquid dispensing, and short process flow

Active Publication Date: 2013-03-27
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing treatment process is long, the cost is high, the investment is large, the process is very complicated, and the treatment effect is not ideal

Method used

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  • Fracturing flowback fluid treatment method
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  • Fracturing flowback fluid treatment method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Composition A of the fracturing flowback fluid sample: Petroleum = 678mg / L, COD = 3195mg / L, Ca = 5620mg / L, SS = 1220mg / L. The treatment method for the flowback liquid is to first add 1.7% sodium carbonate, 0.5% calcium hydroxide, 4mg / l PAM, 0.3% PAC and other composite flocculation precipitation to remove scaling elements, stir for 30 minutes, and then carry out liquid-solid separation .

[0049] The solution after filtration and precipitation enters the auto-oxidation generating device, and in the electric field of V=8.4~8.5V, I=8A, the chlorine ions in the wastewater are converted into hypochlorite and chlorine gas through the excitation effect of the electric field. After 30 minutes, the concentration of hypochlorite oxidizing agent in the solution reaches 5~8mg / L, then carry out stirring oxidation aeration reaction for 2 hours, and finally carry out filtration treatment. At this time, the solution COD=498mg / L, petroleum=26mg / L, Ca=382mg / L.

[0050] The solution wa...

Embodiment 2

[0052] The process of this embodiment is to add ultrasonic assisted catalysis in the autoxidation stage in embodiment 1. In an electric field of V=8.4~8.5V, I=1A, ultrasonic waves with a frequency range of 17.5-22.5Hz are used to convert chlorine ions in wastewater into hypochlorite and chlorine gas. After 20 minutes, the concentration of hypochlorite oxidizing agent in the solution reaches 5~8mg / L, then carry out stirring oxidation aeration reaction for 2 hours, and finally carry out filtration treatment. At this time, the solution COD=460mg / L, petroleum=20mg / L, Ca=382mg / L

[0053] The solution was prepared according to the requirements of "Water-based Fracturing Fluid Performance Evaluation Method" SY / T5107-1995. The result was that the six-speed rotary viscometer was used at room temperature for 170s -1 Shear, base fluid viscosity 54mPa.s; at 65°C, 170s -1 Continuous shearing at a shear rate of 90 minutes, viscosity = 90mPa.s, meets the requirements of liquid preparation,...

Embodiment 3

[0055] The process of this embodiment is to add ultraviolet light to assist catalysis in the autoxidation stage in embodiment 1. In the electric field of V=8.4~8.5V, I=1A, and under the assisted excitation of ultraviolet light (UVC for short) with a wavelength of 100-275nm, the chlorine ions in the wastewater are converted into hypochlorite and chlorine gas. After 20 minutes, the concentration of hypochlorite oxidizing agent in the solution reaches 5~8mg / L, then carry out stirring oxidation aeration reaction for 2 hours, and finally carry out filtration treatment. At this time, COD of the solution=442mg / L, petroleum=23mg / L, Ca=382mg / L

[0056] The solution was prepared according to the requirements of "Water-based Fracturing Fluid Performance Evaluation Method" SY / T5107-1995. The result was that the six-speed rotary viscometer was used at room temperature for 170s -1 Shear, base fluid viscosity 54mPa.s; at 65°C, 170s -1 Continuous shearing at a shear rate of 90 minutes, visc...

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Abstract

The invention discloses a treatment method for flowback fluid in horizontal well fracturing exploitation of oil fields and unconventional oil and gas fields, such as natural gas and shale gas. The method comprises the steps of: removing scale-forming elements from fracturing flowback fluid by flocculation and sedimentation; and converting chloride ions in waste water into hypochlorite and chlorine gas by using an acousto-optic electrical excitation effect, and carrying out deep oxidation without adding extra oxidants in the whole process. According to the method, components influencing the preparation of the fracturing fluid are removed, and other useful components are reserved completely or partially, thereby reducing the waste liquid treatment cost, and reducing the addition cost of additives during the preparing of the fracturing fluid. According to the method provided by the invention, the process flow is short, the cost is low and the efficiency is high, and is particularly suitable for treating flowback fluid with high oil content, high COD (chemical oxygen demand) and high turbidity produced by horizontal well fracturing construction as well as waste waters produced by various kinds of oil fields.

Description

technical field [0001] The invention relates to a process method for treating flowback liquid during large-scale fracturing construction in the exploitation process of unconventional oil and gas fields such as oil fields, natural gas, shale gas, etc., especially a treatment method for horizontal well fracturing flowback fluid, which belongs to oil and gas field exploitation Sewage treatment technology field. Background technique [0002] Large-scale horizontal well fracturing is the basic way of mining oil fields, natural gas, shale gas and other unconventional oil and gas fields. After the fracturing operation is completed, 10-30% of the fracturing fluid will be discharged from the formation, which is called fracturing. Flowback fluid. It contains various additives such as petroleum hydrocarbons, thickeners, bactericides, and drag reducers, as well as many inorganic ions. The composition is very complex, and it is a difficult-to-treat wastewater with high salinity, high tu...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F1/76
Inventor 吴萌陈雁南王俐万用波王永光原帅姜长辉刘庆张建华李强
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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