Shale gas fracturing flow-back fluid up-to-standard discharge treatment process method and system

Abstract

The invention discloses a shale gas fracturing flow-back fluid up-to-standard discharge treatment process method and a system thereof, and relates to the technical field of sewage treatment; the system comprises the following units connected in sequence: an air flotation unit, an effective softening unit, an effective coagulating sedimentation unit, an activated carbon particle adsorption unit, an ultrafiltration unit and a reverse osmosis unit. By means of the system and the technological method, turbidity and scale forming ions (calcium and the like) in flowback liquid can be effectively reduced, the water quality of membrane inlet water is improved, and membrane strong brine is treated into crystalline salt meeting the industrial salt standard.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a process method and a system for treating shale gas fracturing flowback liquid up to standard. Background technique [0002] With the acceleration of my country's energy structure adjustment, shale gas has become one of the important sources of energy replacement. The mining life of shale gas fields can reach 30 to 50 years, and the value of development and utilization is great, which has become an important part of the field of oil and gas resources. Hydraulic fracturing is a hydraulic pressurized drilling technology widely used in shale gas exploitation. The main principle is to inject fracturing fluid into the well under pressurized conditions, and break the tight structure of the surrounding rock formation to form fractures, so that shale gas can flow out of the rock fractures. let go. During shale gas fracturing operations, a large amount of fracturing flowback f...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to address the shortcomings of the existing shale gas fracturing flowback fluid up to standard discharge treatment technology, especially the deficiency of the pretreatment technology, such as the dosage of fracturing flowback fluid pretreatment agents for different water qualities Inaccurate, resulting in the inability to stabilize and effectively reduce the turbidity and scale-forming ions (calcium, etc.) of shale gas fracturing flowback fluid in water quality changes, and the inability to produce better water quality and single composition (mainly containing sodium chloride) For the problem of membrane concentrated brine, the present invention provides a shale gas fracturing flowback fluid up-to-standard discharge treatment process and system thereof, through which the system and process can effectively reduce the turbidity and scale-forming ions in the flowback fluid ( Calcium, etc.), improve the water quality of the membrane, and treat the concentrated brine of the membrane into crystalline salt that meets the industrial salt standard

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