Unconventional oil field exploration and development fracturing flowback fluid reuse treatment method

A technology of fracturing flowback fluid and treatment methods, which is applied in mining wastewater treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc. It can solve problems such as oilfield injection-production imbalance and formation damage, and reduce water turbidity. degree and petroleum content, reduce the salinity of water body, and stabilize the water quality of produced water

Inactive Publication Date: 2016-06-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the continuous deepening of "unconventional development", there will be more and more unconventional wells, and the output of fracturing flowback fluid will also continue to increase. If the traditional treatment method is still continued, only simple treatment will be carried out before re-injection into the formation , will inevitably cause potential damage to the formation
In addition, due to the serious imbalance between injection and production in oilfields, simply adopting simple and extensive treatment methods will be unsustainable in the long run

Method used

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  • Unconventional oil field exploration and development fracturing flowback fluid reuse treatment method

Examples

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Effect test

Embodiment 1

[0028] The fracturing flowback fluid of an unconventional development well in an oilfield is pumped into the mechanical grid. The width of the mechanical grid is 1mm. The fracturing flowback fluid enters the oil separation tank and the coalescence air flotation tank successively after being filtered by the mechanical grid. The hydraulic retention time in both the oil separation tank and the coalescence air flotation tank is 30 minutes, and the filler in the coalescence air flotation tank is made of polypropylene double sinusoidal plates. The COD removal rate in the water is about 21% after the coalescence air flotation tank, and the oil removal effect is more obvious. The oil content in the water produced by the coalescence air flotation tank can be stably controlled below 30mg / L, and the removal rate is over 70%. This is the result of the combined effect of polypropylene coalescing filler and air flotation device for enhanced degreasing; the chroma of the water body is reduced...

Embodiment 2

[0043] The fracturing flowback fluid of an unconventional development well in an oilfield is pumped into the mechanical grid. The width of the mechanical grid is 1mm. The fracturing flowback fluid enters the oil separation tank and the coalescence air flotation tank successively after being filtered by the mechanical grid. The hydraulic retention time in both the oil separation tank and the coalescence air flotation tank is 25 minutes, and the filler in the coalescence air flotation tank is made of polypropylene double sinusoidal plates. The COD removal rate in the water is 20.5% after the coalescence air flotation tank, and the oil removal effect is more obvious. The oil content in the water produced by the coalescence air flotation tank can be stably controlled below 28mg / L, and the removal rate reaches 72.5%, which is The results of the joint action of polypropylene coalescing filler and air flotation device to enhance degreasing; the chroma of the water body is reduced from...

Embodiment 3

[0057] The fracturing flowback fluid of an unconventional development well in an oilfield is pumped into the mechanical grid. The width of the mechanical grid is 1mm. The fracturing flowback fluid enters the oil separation tank and the coalescence air flotation tank successively after being filtered by the mechanical grid. The hydraulic retention time in both the oil separation tank and the coalescence air flotation tank is 35 minutes, and the filler in the coalescence air flotation tank is made of polypropylene double sinusoidal plates. The removal rate of COD in the water after the coalescence air flotation tank is 20.8%, and the removal effect of petroleum is relatively obvious. The content of petroleum in the water produced by the coalescence air flotation tank can be stably controlled below 30mg / L, and the removal rate is over 70%. It is the result of the joint action of polypropylene coalescing filler and air flotation device to strengthen degreasing; the chroma of the wa...

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Abstract

The present invention provides an unconventional oil field exploration and development fracturing flowback fluid reuse treatment method. The treatment method includes the following specific steps: pretreatment, ceramic membrane microfiltration treatment and electrodialysis treatment. The pretreatment section uses processing steps of mechanical grid, oil separator, coalescence and flotation, conditioning tank, and flocculation and flotation, effectively removes chunks of contaminant, particle suspended solids and oil in various forms, etc. in water body, mitigates the ceramic microfiltration membrane operating load, and ensures a smooth and efficient operation of the ceramic microfiltration membrane. The ceramic membrane microfiltration can ensure a stable water quality of the produced water, effectively reduce turbidity and oil content in the water body, further improve the water quality, and delay the pollution trends of electrodialysis device. The electrodialysis technology uses the operation of the electrodialysis device to treat the treated pressure flowback fluid in a light chamber and a concentrated chamber of the device, so as to significantly reduces water body mineralization and achieves the purpose of reuse.

Description

technical field [0001] The invention relates to the technical field of oilfield fracturing flowback fluid treatment, in particular to a method for reusing unconventional oilfield exploration and development fracturing flowback fluid. Background technique [0002] Unconventional oil and gas resources refer to oil and gas resources that cannot be explored and developed by conventional methods and technical means, mainly including tight sandstone, shale oil, heavy oil, super heavy oil, deep oil, shale gas and coalbed methane, etc. The state regards the development of unconventional oil and gas resources as an important content of its resource strategy. As a reserve resource with huge reserves, unconventional oil and gas resources are attracting increasing attention. The reservoir characteristics and production mechanism of unconventional oil and gas resources are significantly different from those of conventional oil and gas resources. Large-scale staged fracturing technology ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F103/10
Inventor 王志强孙恩呈魏玉梅宋泓霖吴晓东孟照瑜
Owner CHINA PETROLEUM & CHEM CORP
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