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<p>This study aims to develop an efficient and environmentally friendly approach for the resource recovery and harmless treatment of waste oil-based drilling mud (WOM). A comprehensive treatment process was implemented, including chemical demulsification and mechanical dehydration of WOM, advanced oxidation and coagulation-flocculation treatment of intermediate water (IW), and cement-based solidification of dehydrated mud (DM). The results demonstrate that the dehydration process achieved excellent oil recovery (95.62%) and volume reduction (93.20%), with residual oil and water contents of 0.40% and 4.33% in DM, respectively. The IW treatment (pH adjustment to 6, 5000&#xa0;mg/L NaClO oxidation for 25&#xa0;min, followed by pH 9 adjustment and sequential addition of 120&#xa0;mg/L PAC and 8&#xa0;mg/L APAM) produced clean water (CW) with 98.6% transmittance (TR), suitable for fracturing fluid preparation. Furthermore, DM solidified with fly ash: cement: quicklime (10%:30%:20%) exhibited high compressive strength (16.22&#xa0;MPa) and leachate meeting national discharge standards. This integrated approach successfully transforms hazardous WOM into reusable resources while ensuring environmental compliance, providing a practical solution for sustainable drilling waste management.</p>

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Recycling treatment of waste oil-based drilling mud in gas fields

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月19日

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  • Hailong Cao,
  • Boyang Hu

摘要

This study aims to develop an efficient and environmentally friendly approach for the resource recovery and harmless treatment of waste oil-based drilling mud (WOM). A comprehensive treatment process was implemented, including chemical demulsification and mechanical dehydration of WOM, advanced oxidation and coagulation-flocculation treatment of intermediate water (IW), and cement-based solidification of dehydrated mud (DM). The results demonstrate that the dehydration process achieved excellent oil recovery (95.62%) and volume reduction (93.20%), with residual oil and water contents of 0.40% and 4.33% in DM, respectively. The IW treatment (pH adjustment to 6, 5000 mg/L NaClO oxidation for 25 min, followed by pH 9 adjustment and sequential addition of 120 mg/L PAC and 8 mg/L APAM) produced clean water (CW) with 98.6% transmittance (TR), suitable for fracturing fluid preparation. Furthermore, DM solidified with fly ash: cement: quicklime (10%:30%:20%) exhibited high compressive strength (16.22 MPa) and leachate meeting national discharge standards. This integrated approach successfully transforms hazardous WOM into reusable resources while ensuring environmental compliance, providing a practical solution for sustainable drilling waste management.