| 表镶大颗粒人造金刚石钻头受力及水力学数值模拟研究 |
| 投稿时间：2016-01-04 修订日期：2016-01-04 点此下载全文 |
| 引用本文：王骕,刘宝昌.表镶大颗粒人造金刚石钻头受力及水力学数值模拟研究[J].钻探工程,2016,43(8):64-68.WANG Su,LIU Bao-chang. Numerical Simulation Study on Force and Hydraulics of Surface Set Large Particle Synthetic Diamond Bit[J]. Drilling Engineering, 2016,43(8):64-68. |
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| 基金项目:国家自然科学基金项目“硬岩钻探用金刚石复合片的仿生结构设计及强韧化机理”（编号：41572357） |
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| 中文摘要:人造大颗粒金刚石技术的不断发展，使得利用其制造表镶金刚石钻头在技术上及经济上均变得可行。本文对φ75 mm表镶人造金刚石钻头的受力、流场与温度场进行了数值模拟，结果表明：金刚石颗粒在高钻压无钻井液循环的条件下极易发生碳化；在钻井液冷却作用下，钻头旋转一圈0.08 s，钻头体会在0.006 s之内冷却；同时水力空化作用与钻井液中固相颗粒对钻头体的冲蚀作用明显；金刚石颗粒内存在较大微裂纹时，金刚石会在小于其许用应力条件下发生破坏。通过对比分析，表镶金刚石钻头的最外侧与最内侧水口处的金刚石较易发生破坏，在设计与制造钻头时应进行强化。 |
| 中文关键词:表镶金刚石钻头 人造大颗粒金刚石 数值模拟 钻头设计 |
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| Numerical Simulation Study on Force and Hydraulics of Surface Set Large Particle Synthetic Diamond Bit |
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| Abstract:The development of large particle synthetic diamond technology makes it feasible technically and economically to manufacture surface set diamond bit. In this paper, numerical simulation study on the force, flow field and temperature field of φ75mm surface set synthetic diamond bit were made. The results indicate that diamond particles will be easily carbonized in the conditions of high bit weight and without drilling fluid circulation. With the cooling effect of drilling fluid, bit would get refrigeration in 0.006s during one round of bit rotation in 0.08s. Meanwhile, the erosion effect on bit body by hydraulic cavitation and solid particles in drilling fluid is very obvious. Duo to micro cracks in diamond particles, damage could occur in diamond particles even under the allowable stress. The comparative analysis shows that the diamonds on the outermost and the innermost nozzles of surface set diamond bit are prone to be damaged, so the design and manufacturing of surface set diamond bit should be strengthened. |
| keywords:surface set diamond bit large particle synthetic diamond numerical simulation analysis design of bits |
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