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Oil and gas field fracturing flow-back fluid treatment process

A fracturing flowback fluid and treatment process technology, applied in mining wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Large-scale production practice, unsatisfactory CODcr removal effect, etc., to achieve better adsorption effect, reduce blockage of saturated blocks, and reduce burden

Inactive Publication Date: 2015-05-20
乌鲁木齐奥森碳环生物能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

②Coagulation method: Coagulation method is currently the most widely used method in oilfield sewage treatment in China. Flocculation and sedimentation can effectively remove suspended solids in wastewater, and the removal rate of petroleum and turbidity is also high, but it is not effective for CODcr The removal effect is not ideal
However, due to the small potential difference, long residence time and limited effect, it cannot be applied to large-scale production practice
(4) Physical method: ① Filtration method: Filtration method is mainly to filter and remove suspended particles in petroleum sewage through rapid filtration process, so as to achieve the effect of removing turbidity, but the removal effect on soluble fracturing fluid additives is very little
[0004] In practical engineering, it is basically a combination of the above-mentioned types of processes, but there are still defects such as high investment and operation costs, or poor treatment effects, and cannot be engineered. Therefore, it is urgent to develop an effective treatment method to prevent fracturing. Drainage pollution will pollute the environment while reducing the economic cost of oilfield development

Method used

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Examples

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Embodiment 1

[0016] Embodiment 1, a kind of treatment process of oil and gas field fracturing flowback liquid, as attached figure 1 As shown, it includes regulating tanks, grit settling and grease traps, air flotation tanks, primary oxidation tanks, Fenton oxidation towers, and active coke filtration and adsorption tanks connected in sequence through pipelines, valves, and lift pumps. Among them, the adjustment tank is provided with perforated aeration pipes for blast aeration; the sand and grease trap is provided with polypropylene inclined pipes, and the inclined pipes are installed with a horizontal angle of 60°; the air flotation coagulation tank is provided with a dosing device. The coagulants added are PAC (polyaluminum chloride) and PAM (polyacrylamide), and the air flotation method adopts dissolved air flotation; the primary oxidation pool uses sodium hypochlorite as the primary oxidant, and there is a dosing device and a reaction stirring device; the Fenton oxidation tower is in t...

Embodiment 2

[0025] Embodiment 2. Using the treatment process of the present invention, the fracturing flowback fluid produced in the oil recovery process of an oil field is treated. Designed for continuous operation 24 hours a day.

[0026] 1. Design water quality

[0027]

[0028] 2. Process parameter design

[0029] (1) A grill is set in the regulating tank to remove coarse suspended matter and floating matter in the wastewater. The adjustment tank adopts perforated aeration tube to blow and aerate the air volume to 0.05m 3 / m 2 .min. The residence time of the regulating tank is 4h; the homogenized and evenly distributed wastewater enters the grit degreasing tank, and the surface load is 0.75m 3 / m 2 .h, the length of the inclined pipe is 1 meter, and it is installed according to the horizontal angle of 60°. It settles to remove the sediment entrained by the flowback liquid and removes the oil slick; (2) The outlet water of the regulating tank is lifted into the coagulation air...

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Abstract

The invention belongs to the technical field of wastewater treatment and in particular relates to an oil and gas field fracturing flow-back fluid centralized treatment process. The oil and gas field fracturing flow-back fluid centralized treatment process comprises the following steps: 1, collecting fracturing flow-back fluid into an adjusting tank, carrying out homogenizing and quantity equalizing treatment on the fracturing flow-back fluid, and enabling the fracturing flow-back fluid to enter a sand settling and oil removal tank to be subjected to sand settling and oil removal; 2, lifting effluent of the adjusting tank into a coagulation / air floatation tank, adding a flocculating agent, and removing floating oil and suspended matters through flocculation and air floatation; 3, enabling effluent of the air floatation tank to enter a primary oxidation unit, adding sodium hypochlorite, and primarily oxidizing and decomposing macromolecular organic compounds; 4, enabling effluent of a primary oxidation tank to enter a Fenton oxidation tower, and deeply oxidizing and decomposing by adopting a Fenton oxidizing agent; 5, enabling effluent of the Fenton oxidation tower to enter a sedimentation tank; and 6, enabling effluent of the sedimentation tank to enter an activated coke filtration and adsorption tank to be subjected to filtration and adsorption treatment, various indexes of effluent of the activated coke filtration and adsorption tank can reach the standard, and the effluent of the activated coke filtration and adsorption tank can be discharged or recycled. The oil and gas field fracturing flow-back fluid centralized treatment process is applicable to treatment of fracturing flow-back fluid in unconventional oil and gas field fracturing mining of petroleum, natural gas, shale gas and coal bed gas.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a process for centralized treatment of oil and gas field fracturing flowback fluid. Background technique [0002] At present, in the development of oil and gas fields at home and abroad, fracturing operation is an important production stimulation measure, which is widely used in various oil fields. The resulting fracturing waste fluid (generally, at least 300m of viscous waste fluid will be produced after each well is fractured) 3 Left and right) have the characteristics of deep color, strong acidity, high viscosity, high CODcr, and difficult to degrade, especially some hydrophilic organic additives, which are difficult to get out of the wastewater. If they are directly discharged without treatment, they will cause serious damage to the surrounding environment. pollute. In the past 50 years, many scholars at home and abroad have proposed various methods...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/10
Inventor 许丽萍马汉青
Owner 乌鲁木齐奥森碳环生物能源有限公司
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