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Technology for treating fracturing flow-back fluid of oil and gas field through multi-metal catalytic oxidation

A fracturing flowback fluid, catalytic oxidation technology, applied in the direction of oxidized water/sewage treatment, special compound water treatment, water/sewage multi-stage treatment, etc., can solve the problems of reducing pollution, pollution, and difficult to be degraded, etc. To achieve the effect of improving biodegradability

Inactive Publication Date: 2019-12-10
陕西睿兴华环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If such sewage is directly discharged without treatment, its own characteristics make it difficult to be degraded under the action of natural forces, which will cause serious pollution to the surrounding environment, especially to crops and surface water systems; at the same time, a large number of heavy metals The damage to the ecosystem and water environment by substances is difficult to recover, so measures must be taken to reduce the degree of pollution

Method used

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  • Technology for treating fracturing flow-back fluid of oil and gas field through multi-metal catalytic oxidation
  • Technology for treating fracturing flow-back fluid of oil and gas field through multi-metal catalytic oxidation
  • Technology for treating fracturing flow-back fluid of oil and gas field through multi-metal catalytic oxidation

Examples

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Effect test

Embodiment 1

[0028] Example 1: The fracturing fluid pretreatment system mainly includes multi-metal catalytic oxidation, coagulation sedimentation, air flotation, filtration and plate and frame filter press. The influent COD of the pretreatment system is 5500-7000mg / L; the pretreatment effluent COD is 3000-3500mg / L, and the SS is less than 100mg / L.

[0029] See Table 1 for fracturing fluid pretreatment process indicators:

[0030]

[0031] Process index of fracturing fluid pretreatment section

[0032] See Table 2 for details of chemicals required for the fracturing fluid pretreatment process:

[0033]

[0034] Table 2 Description of agents in the fracturing fluid pretreatment section

Embodiment 2

[0035] Example 2: Multi-metal catalytic oxidation technology is a new type of oxidation technology belonging to advanced oxidation technology. In addition to the advantages of advanced oxidation, this technology inherits the characteristics of traditional Fenton's strong oxidation ability, which is of great help to improve the biodegradability, solubility and coagulation of wastewater, and is beneficial to the subsequent treatment of wastewater. In multi-metallic fillers, doping a small amount of Fe3-xNix04, Fe3-xCox04 and Fe3-xMnx04transition metals can significantly improve the catalytic activity of the catalyst for H2O2decomposition, and Mn and Co can enhance the catalytic activity of magnetite. The iron source is stable in the internal structure of the catalyst, and can effectively generate light radicals·OH in the process of catalyzing hydrogen peroxide, the degree of restriction by the pH of the reaction will be reduced, and the reaction will not be accompanied by iron hy...

Embodiment 3

[0038] Example 3: Using a high-efficiency composite flocculant to carry out bridging flocculation on water samples after advanced oxidation and deboronation treatment, and realize the separation of oil, SS and organic pollutants in sewage in this unit. This unit integrates pH Adjustment, coagulation reaction, flocculation and precipitation separation are integrated. Under the action of coagulant and return sludge, the sewage in the flocculation reaction zone forms a high-concentration suspended sludge layer to increase the chance of particle collision and effectively absorb colloids and suspended solids. , CODcr and other pollutants, realize the coagulation, cohesion and precipitation separation of SS and fine particles in wastewater, and reduce the difficulty of treatment for subsequent filtration units. In the flocculation unit, the pipes are arranged reasonably to ensure that the effluent passes through the baffles of the flocculation tank evenly. In the baffles of the floc...

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Abstract

The invention discloses a technology for treating fracturing flow-back fluid of an oil and gas field through multi-metal catalytic oxidation, and is characterized in that the technology comprises thefollowing steps: an oxidation process: firstly, catalytic oxidation treatment is carried out on multiple metals in a fracturing fluid pretreatment workshop; a filtering process: a series of filteringsteps are carried out through air floatation, coagulation pretreatment, MBR passing and activated carbon adsorption DQS modular combined equipment; and an adsorption process, wherein precipitation separation is facilitated through the principle of the step S2, and the adsorption effect is achieved. After all the steps are completed, Fenton oxidation, flocculation, SBR and combined treatment are carried out on fracturing wastewater. According to the biological method, organic substances and toxic substances in the wastewater are degraded through the metabolic action of microorganisms; comparedwith other wastewater treatment methods, the biological method has the greatest advantage of no secondary pollution, and the fracturing flow-back fluid has high COD, so that oxidation, flocculation, filtration and other methods are generally needed for pretreatment before the biological method is used for treatment, and the biodegradability of the wastewater is improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas field flowback fluids, in particular to a technique for treating oil and gas field fracturing flowback fluids through multi-metal catalytic oxidation. Background technique [0002] Natural gas in tight sandstone gas reservoirs is playing an increasingly important role in gas reserves and growth and energy supply. Tight sandstone gas reservoirs exist in many basins in the world, with huge resources. At present, the natural gas production of tight sandstone gas reservoirs accounts for about 1 / 5 of China's total annual natural gas production, has become an important force in natural gas supply, and will continue to be a bright spot in the growth of reserves and production. However, the geological conditions of tight sandstone gas reservoirs are complex, such as tight lithology, small porosity, and ultra-low permeability gas reservoirs. Cracks are opened in the gas layer to increase porosity and...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/30C02F103/36
CPCC02F1/001C02F1/24C02F1/28C02F1/283C02F1/46176C02F1/5236C02F1/56C02F1/66C02F1/722C02F1/725C02F1/76C02F3/1263C02F3/1268C02F9/00C02F2001/007C02F2101/30C02F2103/365C02F2305/023C02F2305/026
Inventor 姚留栓刘修和黄体校
Owner 陕西睿兴华环境科技有限公司
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