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RESEARCH ARTICLE  [Accepted]
Study on resource recovery and harmless treatment of waste oil-in-water drilling fluid
Tang Chao1,2, and Xie Shui Xiang3
1Engineering and Technology College, Yangtze University, JingZhou 434000, China
2Petroleum Engineering College, Yangtze University, Wuhan 430000, China
3CNPC Research Institute of Safety & Environment Technology, Beijing 10000 , China
Corresponding Author: Tang Chao ,Tel: +86-0716-8067503 , Fax: +86-0716-8067507, Email: 395450161@qq.com
Received: December 14, 2016;  Accepted: February 14, 2017.
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ABSTRACT
Destablization and demulsification is a difficult task for the treatment of waste oil-in-water drilling fluid because of its “three-high” characteristics: emulsification, stabilization and oiliness. At present, China is short for effective treating technology, which restricts cleaner production in oilfield. This paper focused on technical difficulties of waste oil-in-water drilling fluid treatment in JiDong oilfield of China, adopting physical-chemical collaboration demulsification technology to deal with waste oil-in-water drilling fluid. After oil-water-solid three-phase separation, the oil recovery rate is up to 90% and the recycled oil can be reused for preparation of new drilling fluid. Meanwhile, harmless treatment of wastewater and sludge from waste oil-in-water drilling fluid after oil recycling was studied. The results showed that wastewater after treated was clean, contents of chemical oxygen demand and oil decreased from 993 mg/L and 21,800 mg/L to 89 mg/L and 3.6 mg/L respectively, which can meet the requirements of grade one of “The National Integrated Wastewater Discharge Standard” (GB8978); The pollutants in the sludge after harmless treatment are decreased below the national standard, which achieved the goal of resource recovery and harmless treatment on waste oil-in-water drilling fluid.
Keywords: Collaboration demulsification | Harmless treatment | Oil recovery | Recycle | Waste oil-in-water drilling fluid
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