Technology for treating and recycling fracturing flow-back fluid of oil and gas field

A technology for fracturing flowback fluid and oil and gas fields, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of long treatment process, unsatisfactory treatment effect and complex process To avoid secondary pollution, reduce the amount of sewage generated, and reduce degradation products

Inactive Publication Date: 2014-03-26
张云龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the ultimate goal of the existing oil and gas field fracturing flowback fluid treatment is discharge or reinjection, which makes the existing treatment process long, high in cost, large in investment, complex in process, and ineffective in treatment. ideal

Method used

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  • Technology for treating and recycling fracturing flow-back fluid of oil and gas field
  • Technology for treating and recycling fracturing flow-back fluid of oil and gas field
  • Technology for treating and recycling fracturing flow-back fluid of oil and gas field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The fracturing fluid flowback fluid waste in the Hailaer block of Daqing Oilfield is transported to the fracturing flowback fluid treatment station by tank truck. The specific process is as follows:

[0025] Step S1: Recover the waste fluid of the fracturing flowback fluid through oil separation to obtain recovered waste fluid.

[0026] The waste liquid of fracturing flowback fluid is unloaded in the waste oil recovery tank, and the waste oil continuously settles and separates to float on the liquid surface. After being recovered by the oil skimmer, the recovered waste liquid is obtained, and transported by the liquid tanker to the combined station for treatment. The oil separation recovery time is 55min.

[0027] Step S2: Degrading the recovered waste liquid to obtain degraded waste liquid.

[0028] The recovered waste liquid enters the oxidation tank through the pipeline from the waste oil recovery tank, and bacteria species are added and a large amount of oxygen is...

Embodiment 2

[0038] The waste fracturing flowback fluid in the Outer Mengtamchag block of Daqing Oilfield is transported to the fracturing flowback fluid treatment station by tank truck. The specific process is as follows:

[0039] Step S1: Recover the waste fluid of the fracturing flowback fluid through oil separation to obtain recovered waste fluid.

[0040] The waste liquid of fracturing flowback fluid is unloaded in the waste oil recovery tank, and the waste oil continuously settles and separates to float on the liquid surface. After being recovered by the oil skimmer, the recovered waste liquid is obtained, and transported by the liquid tanker to the combined station for treatment. The oil separation recovery time is 60min.

[0041] Step S2: Degrading the recovered waste liquid to obtain degraded waste liquid.

[0042] The recovered waste liquid enters the oxidation tank through the pipeline from the waste oil recovery tank, and bacteria species are added and a large amount of oxyge...

Embodiment 3

[0052] The waste fracturing flowback fluid in the Zhaoyuan block of Daqing Oilfield is transported to the fracturing flowback fluid treatment station by tanker truck. The specific process is as follows:

[0053] Step S1: Recover the waste fluid of the fracturing flowback fluid through oil separation to obtain recovered waste fluid.

[0054] The waste liquid of fracturing flowback fluid is unloaded in the waste oil recovery tank, and the waste oil continuously settles and separates to float on the liquid surface. After being recovered by the oil skimmer, the recovered waste liquid is obtained, and transported by the liquid tanker to the combined station for treatment. The oil separation recovery time is 50min.

[0055] Step S2: Degrading the recovered waste liquid to obtain degraded waste liquid.

[0056] The recovered waste liquid enters the oxidation tank through the pipeline from the waste oil recovery tank, and bacteria species are added and a large amount of oxygen is su...

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Abstract

The invention discloses a technology for treating and recycling a fracturing flow-back fluid of an oil and gas field. The technology comprises the steps as follows: oil-separation recovery is performed on a waste fluid of the fracturing flow-back fluid, so that a recovered waste fluid is obtained; the recovered waste fluid is degraded, so that a degraded waste fluid is obtained; flocculation and flotation are performed on the degraded waste fluid, so that floccules are obtained; and the floccules are separated from the fluid, so that a fluid for preparing an oil and gas field fracturing fluid is obtained. According to the technology, sump oil and waste fluid resources are recycled fully, and the treated waste fluid satisfies a standard requirement of preparation of the fracturing flow-back fluid.

Description

technical field [0001] The invention relates to the technical field of oil and gas field wastewater treatment, in particular to a process for treating and reusing oil and gas field fracturing flowback fluid. Background technique [0002] As the workload of downhole operations in Daqing Oilfield expands year by year, the number of downhole operations increases accordingly, and the amount of sewage discharged from downhole operations is also increasing. Compared with oil extraction wastewater, downhole operation wastewater has the characteristics of complex composition and difficult treatment. At present, due to the limitation of site conditions and technical level, these wastewater are generally discharged on site in the well site sewage tank, forming a certain degree of pollution. source of pollution. Taking 2011 as an example, a total of more than 1,000 well operations were carried out throughout the year, the discharge of fracturing and acidizing fluids was about 60,000 t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 张云龙
Owner 张云龙
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