Kinetic analysis applied to ferrous ions with hydrogen peroxide in acidified hydraulic fracturing reflux fluid model containing representative organic additives

Arabian Journal of Chemistry

Le Zhang¹  JinLing Li²  Chengtun Qu²  Fan Wang³  Bo Yang³  Haijie Hu³  Xuan Qu³ 

[1] Reservoir Protection of Oil Field, Xi’an Shiyou University, Xi’an 710065, PR China;;Shaanxi Key Laboratory of Environmental Pollution Control Technology &College of Chemistry and Chemical Engineering, Xi’an Shiyou University, Xi’an 710065, PR China;

关键词: Oxidation kinetics;    Ferrous iron;    Flowback;    Hydraulic fracturing;    Sustainable water treatment;   

DOI  :  

来源: DOAJ

【 摘 要 】

Acidified hydraulic fracturing technology is a technical measure that uses acid liquid to react with minerals in near wells or reservoirs to enhance permeability, oil well and shale gas extraction, and increase the injection volume of wells. After the acidification construction is completed, the residual acid liquid will be discharged to the ground, which forms acidified waste liquid with low pH and complex composition. Recent studies providing snapshots of processing technology on the acidified waste have highlighted the need to convert the high concentration of Fe(II) in the acidified wastewater into flocculating components through advanced oxidation process. Here we report the discovery of the oxidation kinetics of ferrous ion in simulated acidified waste system, which based on the analysis of major pollutants and high iron content. We show that the change of concentration of ferrous ions was determined by chemiluminescence in tandem with flow injection, and the reaction of hydrogen peroxide with Fe(II) is a pseudo-first-order reaction. The reaction rate constants at Fe(II) of 50, 100 and 150 mg/L are 0.12612, 0.41686, 1.18230 s−1 respectively. In addition, we evaluated the adaptability of the catalytic oxidation system to acidified waste liquid. This offers a theoretical basis for treatment of acid hydraulic fracturing flowback and a series of treatability of tests, which serves to guide the selection of suitable treatment approach.

【 授权许可】

Unknown