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Rapid treatment method for fracturing flowback fluid

A fracturing flowback fluid and treatment method technology, applied in filtration treatment, precipitation treatment, multi-stage water treatment, etc., can solve the problems of long period of biological gel breaking, high equipment investment cost and large floor space, etc. Realize online processing, improve glue breaking speed and reduce floor space

Pending Publication Date: 2019-11-19
RUIJIE ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology helps break up gels more effectively while reducing their negative impact on other materials used during well drilling operations or production processes. It also allows for easier handling by making sure that all necessary fluids are mixed together before use instead of just mixing them separately at once. Overall, this innovation provides technical benefits over existing methods like chemically/biologic ones.

Problems solved by technology

This patented technical problem addressed in this patents relates to finding ways to treat fractured fluids from crude oil or natural gases that may be contaminated with harmful substances like sulfur compounds (S) used in drilling operations. Current methods involve injecting special materials into these liquors before they break down them, causing potential health hazards due to their long-term impact upon ground water quality. Therefore there needs better tools to efficiently manage and dispose of spent fracppage without affecting soil properties.

Method used

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Examples

Experimental program
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Embodiment 1

[0037]The fracturing flowback fluid to be treated is the guar gum system fracturing flowback fluid in the Dingbian area of ​​Shaanxi. The oil content in the fracturing flowback fluid is 85mg / L, the suspension content is 280mg / L, the viscosity is 22mPa·s, COD2080mg / L, B 2.1 mg / L, pH 6.89, SRB 25 pieces / mL, under the condition that the irradiation dose of the electron beam irradiation reactor is 15KGy and the residence time is 20s, the viscosity is reduced to below 1.5mPa·s, and the COD is 2512mg / L. Obvious gel breaking effect. During the gel breaking process, a part of recessive COD is converted into dominant, resulting in an apparent increase in COD content. Add PAFC100mg / L, PAM5mg / L, settle in the aggregation sedimentation tank for 20min, and filter with a 3μm oil-resistant bag filter. Final product water: oil 1.5mg / L, suspended matter 2.0mg / L, viscosity 1mPa·s, COD 45mg / L, B 0.3mg / L, bacteria 0 / mL. Sludge produced during the process is higher than the local reinjection sta...

Embodiment 2

[0039] The fracturing flowback fluid to be treated is sewage from the drying pool of Changqing Oilfield. The raw water is black and thick liquid with peculiar smell, and there are dissolution and emulsification phenomena. Detected raw water oil content 186mg / L, suspended matter 411mg / L, pH 5.5, sulfate reducing bacteria 250 / mL, iron bacteria 2.5×103 / mL saprophytic bacteria 150 / mL, viscosity 15mPa·s, in electron beam When the irradiation dose of the irradiation reactor is 8KGy and the residence time is 30s, the viscosity is reduced to below 1.5mPa·s, and the bacteria content is zero. Adjust the pH to neutral, add PAFC80mg / L, PAM10mg / L, settle in the aggregation sedimentation tank for 15min, and filter with a 5μm oil-resistant bag filter. Final product water: oil content 2.5mg / L, suspended matter 8mg / L, viscosity<2mPa·s, bacteria content 0 / mL, higher than the local reuse standard (oil content≤5.0mg / L, suspended matter≤5.0mg / L , viscosity≤1.5mpa·S, pH6-9, sulfide≤2.0mg / L) and ca...

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Abstract

The invention discloses a rapid treatment method for a fracturing flowback fluid. The rapid treatment method comprises: (1) pumping a fracturing flowback fluid into an electron beam irradiation chamber, and staying for 20-120 s in the electron beam irradiation chamber; (2) adding a coagulant and a flocculant into the sewage treated by the electron beam irradiation chamber, and clarifying in a flocculation precipitation pool; (3) feeding the water treated by the flocculation precipitation a precision filtration pool, and carrying out fine filtration; and (4) collecting the water filtered by theprecision filtration pool in a clear water pool. According to the present invention, the gel breaking stage uses physical gel breaking so as to achieve clean gel breaking and greatly reduce the sideeffects of external agents, such that the reuse quality of the fracturing flowback fluid is good, and the fracturing flowback fluid is safe; the gel breaking time is shortened from 5-120 min to 20-120s so as to greatly improve the gel breaking speed; and compared with the traditional chemical gel breaking method and the biological gel breaking method, the method of the present invention simplifyfeeding equipment and other supporting equipment, reduces the occupation area, and reduces the complexity of manual operation.

Description

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Claims

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Application Information

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Owner RUIJIE ENVIRONMENTAL PROTECTION TECH CO LTD
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