Remove Detrimental Solids from Recycled Old Drilling Fluids Using Oil-Based Drilling Fluid Flocculants
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摘要: 针对完钻回收油基钻井液老浆中有害固相含量高导致钻井液性能恶化的关键问题,提出絮凝去除有害固相的技术思路,表征了油基钻井液絮凝剂XN-1对有害固相的絮凝性能,探究了絮凝剂XN-1的絮凝作用机理,评价了絮凝结合筛分、离心在去除老浆中有害固相及优化其流变性能的效果。室内研究与现场试验表明,絮凝剂XN-1在油基钻井液老浆中絮凝效果良好,絮凝前后絮体尺寸由亚微米提高至60 μm;老浆经絮凝、筛分处理后,有害固相去除率为20%左右。老浆经絮凝、离心处理,有害固相去除率可达70.50%,处理后老浆再次配浆,流变性能显著优化。絮凝剂XN-1的使用,有效改善了油基钻井液老浆重复使用效果,实现了油基钻井液老浆的有效回收利用并大幅降低待处置危废量,解决了油基钻井液有害固相难以去除的难题。Abstract: Recycled old oil-based drilling fluids generally contain high concentrations of detrimental solids which result in performance deterioration of the drilling fluids. These detrimental solids can be removed through flocculation. In this study, an oil-based drilling fluid flocculant XN-1 was characterized for its performance in flocculating detrimental drilled solids, the flocculation mechanism of XN-1 was investigated, and the effectiveness of removing drilled solids and optimizing the properties of the oil-based drilling fluids through a combination of flocculation, screening and centrifugation was evaluated. Laboratory study and field experiment show that XN-1 has a good flocculating action in the old oil-based drilling fluid: the sizes of the flocs increase from submicron to 60 μm. After flocculation and screening, about 20% of the detrimental drilled solids are removed from the drilling fluid. After flocculation and centrifugation, 70.50% of the detrimental solids can be removed from the drilling fluid. The old mud, with the detrimental solids being removed, can be used to formulate new muds with significantly optimized properties. The application of the flocculant XN-1 effectively improves the reuse of old oil-based drilling fluids, realizes the effective recycling of old oil-based drilling fluids and greatly reduces of amount of hazardous and waste drilling fluids, and effectively solves the difficulty of removing detrimental solids from oil-based drilling fluids.
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Key words:
- Oil-based drilling fluid /
- Flocculant /
- Old drilling fluid /
- Detrimental solids
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表 1 不同絮凝筛分条件下老浆性能
筛网
目数搅拌速率/
r/mint搅拌/
minT/
℃LGS/
%ρ/
g/cm350 100 10 20 13.07 1.98 100 100 10 20 11.03 1.96 150 100 10 20 10.52 1.95 200 100 10 20 10.24 1.95 200 50 10 20 11.27 1.96 200 150 10 20 10.57 1.95 200 200 10 20 10.42 1.95 200 100 5 20 10.68 1.95 200 100 15 20 10.34 1.96 200 100 10 40 10.57 1.95 200 100 10 60 10.44 1.95 200 100 10 80 10.35 1.95 表 2 不同絮凝离心条件下老浆性能
离心转速/(
r·min−1)t离心/
minT/
℃LGS/
%ρ/(
g·cm−3)1300 5.0 20 10.64 1.67 3300 5.0 20 7.22 1.39 5300 5.0 20 4.12 1.21 7300 5.0 20 4.40 1.12 5300 2.5 20 9.83 1.43 5300 7.5 20 4.52 1.15 5300 10.0 20 4.41 1.08 5300 5.0 40 3.95 1.18 5300 5.0 60 4.01 1.17 5300 5.0 80 4.10 1.18 表 3 絮凝筛分前后老浆密度与固相含量
类别 ρ/(g·cm−3) LGS/% 总固相/% 原始老浆 1.39 12.70 26.20 直接过筛 1.39 12.50 26.30 絮凝过筛 1.37 8.40 21.50 表 4 絮凝离心前后老浆密度与固相含量
类别 ρ/(g·cm−3) LGS/% 总固相/% 原始老浆 2.21 13.90 51.00 未加絮凝剂离心液 1.32 8.90 24.70 絮凝后离心液 1.25 4.10 20.20 -
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