| 破碎松软地层取心钻头孔底流场数值模拟及应用 |
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| 引用本文： | 吴金生,陈礼仪,张伟.破碎松软地层取心钻头孔底流场数值模拟及应用[J].探矿工程,2013,40(7):107-110. |
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| 作者姓名： | 吴金生 陈礼仪 张伟 |
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| 作者单位： | 中国地质科学院探矿工艺研究所,成都理工大学,中国地质科学院探矿工艺研究所 |
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| 基金项目： | 科技部科技支撑计划专项“汶川地震断裂带科学钻探（WFSD）”项目之“科学钻探与科学测井”课题；中国地质调查局地质大调查项目“破碎和强缩径地层大直径深孔取心钻进技术研究”(1212011120258) |
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| 摘 要： | 复杂地层取心和孔壁稳定一直是困扰地质钻探界的2大技术难题。以汶川地震科钻为例，5个钻孔都在断裂带上，地层极破碎、松软。针对部分孔段取心率低问题，设计一种新型阶梯式隔水底喷取心钻头，利用CFD技术对钻头孔底流场进行数值分析，优化钻头排水槽结构、泥浆性能和水力参数，寻找一种最佳组合，为提高岩心采取率、预防堵心，提高孔壁的稳定性奠定基础。
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| 关 键 词： | 破碎松软地层 防冲蚀取心钻头 金刚石钻头 流场 数值模拟 结构优化 |
| 收稿时间： | 2013/6/25 0:00:00 |
| 修稿时间： | 2013/6/25 0:00:00 |
Numerical Stimulation of Bottom Flow Field of Core Bit in Broken Soft Formation and the Application |
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| WU Jin-sheng,CHEN Li-yi and ZHANG Wei.Numerical Stimulation of Bottom Flow Field of Core Bit in Broken Soft Formation and the Application[J].Exploration Engineering(Drilling & Tunneling),2013,40(7):107-110. |
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| Authors: | WU Jin-sheng CHEN Li-yi and ZHANG Wei |
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| Institution: | Institute of Exploration Technology, CAGS,Chengdu University of Technology and Institute of Exploration Technology, CAGS |
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| Abstract: | Coring and keeping the stability hole wall in complex formation are technical difficulties in geological drilling circles. In Wenchuan Earthquake Fault Scientific Drilling (WFSD), 5 boreholes were in the fault zone and the formation was extremely broken and soft. A new type of stepped bottom jetting anti-erosion core bit was designed, numerical analysis was made on bottom flow field by CFD technology to optimize drainage groove structure, mud properties and hydraulic parameters in order to fine the best combination to lay foundations for core recovery rate improvement, core blockage prevention and higher hole wall stability. |
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