化工进展 ›› 2022, Vol. 41 ›› Issue (9): 5109-5114.DOI: 10.16085/j.issn.1000-6613.2021-2346

• 资源与环境化工 • 上一篇    下一篇

页岩压裂返排液的预处理及絮凝剂的溶液结构

钟传蓉1,2(), 冯明石1(), 曾光玉2, 黄晶晶2, 何希高2   

  1. 1.成都理工大学油气藏地质及开发工程国家重点实验室,四川 成都 610059
    2.成都理工大学能源学院,四川 成都 610059
  • 收稿日期:2021-11-16 修回日期:2022-02-07 出版日期:2022-09-25 发布日期:2022-09-27
  • 通讯作者: 冯明石
  • 作者简介:钟传蓉(1968—),女,博士,教授,博士生导师,研究方向为油田化学。E-mail:zhchr@cdut.edu.cn
  • 基金资助:
    四川省应用基础重点研究项目(2019YJ0406)

Pre-treatment of the fracturing flow-back fluid of shale and solution structures of a flocculant

ZHONG Chuanrong1,2(), FENG Mingshi1(), ZENG Guangyu2, HUANG Jinging2, HE Xigao2   

  1. 1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology, Chengdu 610059, Sichuan, China
    2.College of Energy, Chengdu University of Technology, Chengdu 610059, Sichuan, China
  • Received:2021-11-16 Revised:2022-02-07 Online:2022-09-25 Published:2022-09-27
  • Contact: FENG Mingshi

摘要:

页岩压裂返排液因含有多种有机添加剂,其化学需氧量较高。本文研究了新型无机复合混凝剂聚硅酸铝铁(PCM)对废水的混凝效果及与其复配使用的梳型絮凝剂(4-乙烯苄基辛基酚聚氧乙烯醚)-丙烯酰胺-(2-丙烯酰胺基-2-甲基丙磺酸钠)共聚物(PAVA)的絮凝能力,以提高页岩压裂返排液的预处理效率。结果显示,PCM在其加量0.3g/L时的浊度和COD去除率分别为96.1%和71.4%,明显高于常用的聚合氯化铝PAC的水处理性能值;PCM与5mg/L PAVA复配使用后,其用量明显降低,但处理效果更好,加量为0.2g/L时的浊度和COD去除率分别为90.0%和86.1%;PAVA的架桥絮凝能力强于常用的阴离子、阳离子高分子絮凝剂;返排液中ξ电位的绝对值越高,混凝剂的混凝效果越好。

关键词: 废水, 混凝, 絮凝, 页岩, 压裂返排液

Abstract:

The chemical oxygen demand value is high for the fracturing flow-back solution of shale containing a few organic additives. This paper studied the coagulation effect of a novel inorganic compound coagulant polysilicate aluminum ferric (PCM) and the flocculation properties of a comb-like polymer flocculant poly[(p-vinyl benzyl po1yoxyethylene octylphenol ether)-acrylamide-(sodium 2-acrylamido-2-methylpropane sulphonate)] (PAVA) combined with PCM. The objective was to enhance the pre-treating efficiency for fracturing flow-back fluid of shale. Then some results were obtained. When the dosage of PCM alone was at 0.3g/L, the removal efficiencies of turbidity and COD were 96.1% and 71.4%, respectively. These data were obviously higher than those using the typical polyaluminum chloride (PAC). When PCM was used together with PAVA at 5mg/L, the PCM dosage decreased markedly but the treating efficiency was higher. For example, when the dosage of PCM was at 0.2g/L, the removal efficiencies of turbidity and COD were up to 90.0% and 86.1%, respectively. The bridging flocculation effect was stronger for PAVA than for typical anionic and cationic polymer flocculants. The higher the ξ-potential value was in the flow-back fluid, the higher the coagulation efficiency was.

Key words: waste water, coagulation, flocculation, shale, fracturing flow-back fluid

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