华东师范大学学报（自然科学版） ›› 2025, Vol. 2025 ›› Issue (4): 114-123.doi: 10.3969/j.issn.1000-5641.2025.04.012

• • 上一篇    

页岩气田钻井污水钙离子处理剂的制备及性能评价

谭文峰1(), 贾潇2, 杨迅1, 李鑫3,4, 郭一樊3,4, 程远鹏3,4, 唐善法3,4,*()   

  1. 1. 中石油江汉机械研究所有限公司, 湖北 荆州　434000
    2. 长庆油田分公司第六采气厂, 陕西 延安　716000
    3. 长江大学 石油工程学院, 武汉　430100
    4. 长江大学 油气钻采工程湖北省重点实验室, 武汉　430100
  • 收稿日期:2024-05-29 接受日期:2025-03-06 出版日期:2025-07-25 发布日期:2025-07-19
  • 通讯作者: 唐善法 E-mail:tanwf@cnpc.com.cn;tangsf2005@126.com
  • 作者简介:谭文峰, 男, 高级工程师, 研究方向为油气田污水处理技术. E-mail: tanwf@cnpc.com.cn
  • 基金资助:
    国家自然科学基金 (51774049); 中国石油天然气集团有限公司科学研究与技术开发项目 (2021DJ6606)

Preparation and performance evaluation of Ca2+ ion treatment agent for oilfield drilling wastewater

Wenfeng TAN1(), Xiao JIA2, Xun YANG1, Xin LI3,4, Yifan GUO3,4, Yuanpeng CHENG3,4, Shanfa TANG3,4,*()   

  1. 1. Jianghan Machinery Research Institute Co. Ltd., CNPC, Jingzhou, Hubei　434000, China
    2. The Sixth Gas Production Plant, Changqing Oilfield Company, Yan’an, Shaanxi　716000, China
    3. School of Petroleum Engineering, Yangtze University, Wuhan　430100, China
    4. Hubei Key Laboratory of Oil and Gas Drilling and Production Engineering, Yangtze University, Wuhan　430100, China
  • Received:2024-05-29 Accepted:2025-03-06 Online:2025-07-25 Published:2025-07-19
  • Contact: Shanfa TANG E-mail:tanwf@cnpc.com.cn;tangsf2005@126.com

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摘要：

为提高壳聚糖水溶性及其对金属离子的螯合能力, 以过硫酸钾为引发剂, 使用高脱乙酰度 (98%) 壳聚糖 (KJT-1) 接枝丙烯酸合成了一种页岩气田钻井污水钙离子处理剂. 以水中Ca2+去除效果为优化目标, 采用单因素实验优化了合成条件 (温度、反应时间、引发剂及丙烯酸用量), 利用傅立叶红外光谱和核磁共振碳谱对最优合成条件下的产物进行了结构表征, 并评价了其对钻井污水模拟液中多价离子的去除效果. 结果表明, 丙烯酸接枝改性水溶性壳聚糖的最佳合成条件为壳聚糖∶过硫酸钾 = 1∶1.2 (质量比), 壳聚糖∶丙烯酸 = 1∶25 (质量比), 反应时间2 h, 反应温度70 ℃, 该条件下产物 (HCCLJ) 与目标产物的分子结构设计相吻合. HCCLJ添加量为600 mg/L时, 可将模拟水中Ca2+含量从1101 mg/L降至194 mg/L, Ca2+去除率为82.4%. 不同HCCLJ加量对其他多价离子的去除效果优劣顺序为总铁 (Fe2+/Fe3+) > Ba2+ > Mg2+ > Al3+. HCCLJ不仅可以去除Ca2+, 对其他多价离子也有一定的去除效果, 具有一剂多效的功能, 为页岩气田钻井污水的多价离子去除剂的研发奠定了基础, 应用前景广阔.

关键词: 壳聚糖, 接枝改性, 钙离子处理剂, 多价离子

Abstract:

In order to improve the water solubility of chitosan and its chelating ability to metal ions, a Ca2+ ion treatment agent for drilling wastewater of shale gas field was successfully prepared by grafting acrylic acid (AA) onto water soluble chitosan (KJT-1) with high deacetylation degree (98%) using the potassium persulfate (KPS) as initiator. The synthesis reaction conditions (temperature, reaction time, initiator and acrylic acid dosage) were optimized using single factor experimental method with Ca2+ removal rate in wastewater as the optimization target, the synthesized product of the optimal synthesis reaction conditions was structurally characterized using Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance spectroscopy (NMR) and evaluated for the effect on the removal of multivalent ions from simulated drilling wastewater. The results showed that the optimal synthetic reaction conditions for acrylic acid graft-modified water-soluble chitosan were chitosan∶potassium persulfate = 1∶1.2 (mass ratio), chitosan∶acrylic acid = 1∶25 (mass ratio), reaction time of 2 h, and reaction temperature of 70 ℃, the synthetic product (HCCLJ) under these conditions was consistent with the design of the molecular structure of the target product. When the amount of HCCLJ was added at 600 mg/L, the Ca2+ ion content in simulated water can be reduced from 1101 mg/L to 194 mg/L, and the calcium ion removal rate was 82.4%. The removal effect of different HCCLJ dosages on other multivalent ions was in the following order: total iron (Fe2+/Fe3+) > Ba2+ > Mg2+ > Al3+. HCCLJ can not only remove Ca2+ ion, but also have a certain removal effect on other multivalent ions, which has a multi-effect function, and lays a foundation for the research and development of multivalent ions removal agent for oilfield drilling wastewater with a broad application prospect.

Key words: chitosan, graft modification, Ca2+ ion treatment agent, multivalent ions

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