油气田压裂返排液复合氧化处理技术实验研究

Experimental Study on Compound Oxidation Treatment Technology of Fracturing Outlet Liquid in Oil-gas Field

压裂作业是油气田勘探和开发不可缺少的一项重要技术手段。随着该技术在各油田的规模化应用产生了大量的压裂返排液,该类特种废液的处理与处置成为亟待解决的问题。本文以西南某污水处理站压裂返排液为实验对象,提出"预处理-芬顿氧化-二次氧化-活性炭吸附"的复合氧化处理技术,压裂返排液通过该技术处理后COD等部分指标能够达到《污水综合排放标准》(GB8978-1996)一级标准。辅助高效液相色谱图分析,结果也显示出处理各阶段物质成分呈下降趋势。说明压裂返排液复合氧化处理技术能够有效去除污染物,该实验研究也为压裂返排液无害化处理技术的工业化应用提供一定的技术支持。

Fracturing operation is an indispensably important technology of oil-gas field exploration and development. Due to a large amount of fracturing outlet liquid with the large-scale application of this technology in oil fields, the treatment and disposal of this kind of special waste liquid have become problems to be solved. With fracturing outlet liquid from a wastewater treatment station in Southwest China as experimental subject, this article puts forward a compound oxidation treatment technology of ＂ pretreatment-Fenton oxidation-secondary oxidation-activated carbon adsorption＂. Partial indicators of fracturing outlet liquid after treatment with this technology such as COD could meet Level I standard of Integrated Wastewater Discharge Standard, and efficient liquid chromatogram analysis results also showed that material composition at different stages had a decreasing trend.This means the compound oxidation treatment technology of fracturing outlet liquid removes pollutants effectively, and this experimental study also provides certain technical support for the industrial application of harmless treatment technology of fracturing outlet liquid.