Integrated fracturing flow-back fluid brine recycling process

By chemically grafting nano-ferric oxide with polyacrylamide to form a modified composite flocculant, combined with advanced oxidation degelatinization and a multi-stage nanofiltration system, the problems of membrane fouling and heat transfer attenuation in fracturing flowback fluid treatment were solved, achieving efficient brine resource conversion.

CN122102415APending Publication Date: 2026-05-29BEIJING EUROPE & AMERICA ENVIRONMENTAL ENG CO LTD
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Patent Information

Application Number
CN202610262292.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-05
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing technologies are unable to effectively degrade residual polymers and emulsified oils in fracturing flowback fluids, lack precise salt separation and retention mechanisms, leading to membrane fouling and heat transfer attenuation, poor system hydrodynamic stability, and difficulty in treating complex matrices with high salt and high organic matter content.

Method used

A modified composite flocculant is formed by chemically grafting nano-ferric oxide with polyacrylamide. Combined with an advanced oxidation degelatinizer and a multi-stage nanofiltration system, it achieves efficient treatment of complex fracturing flowback fluid through precision filtration, reverse osmosis concentration, and mechanical vapor recompression evaporation crystallization.

Benefits of technology

It significantly improves the removal efficiency of suspended solids and hardness ions, ensures a reduction in the turbidity of the pretreated solution, and achieves the separation of high-purity sodium chloride dilute solution and the production of high-quality industrial-grade salt. The system's operational stability and resource conversion effect are significantly improved.

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Abstract

The invention relates to an integrated fracturing flow-back fluid brine recycling process, and belongs to the technical field of fracturing flow-back fluid treatment and high-salinity wastewater recycling, and the integrated fracturing flow-back fluid brine recycling process comprises the following steps: modifying nano ferroferric oxide by a silane coupling agent, and grafting with polyacrylamide to prepare a composite flocculation material; fracturing flow-back fluid is sequentially subjected to air flotation oil removal and advanced oxidation gel breaking, then the flocculation material and an alkaline agent are added for softening precipitation, and non-ultrafiltration dependent type pretreatment clear liquid is obtained through multi-medium and precise filtration; after the pH value of the clear liquid is adjusted and a scale inhibitor is added, salt separation and impurity interception are performed through a multi-stage nanofiltration system, and permeate liquid is a sodium chloride dilute solution; the diluted liquid is subjected to reverse osmosis high-pressure concentration and clear water recovery, high-concentration sodium chloride purified saline water is fed into a mechanical vapor recompression evaporative crystallization system, and an industrial-grade sodium chloride product is prepared through centrifugal drying. The problem that membrane pollution is likely to happen when an ultrafiltration membrane is used for treating the high-viscosity and high-organic-matter fracturing flow-back fluid is solved, system configuration is simplified, the cost is reduced, and the industrial-grade sodium chloride product is obtained. And the operation stability of the pretreatment stage is improved.
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