| 气举反循环双壁钻具流场仿真分析 |
| 投稿时间：2022-02-24 修订日期：2022-04-22 点此下载全文 |
| 引用本文：伍晓龙,冯钰琦,杜垚森,等.气举反循环双壁钻具流场仿真分析[J].钻探工程,2022,49(3):83-91.WU Xiaolong,FENG Yuqi,DU Yaosen,et al. Simulation analysis of the flow field of the air lift reverse circulation dual wall drill tool[J]. Drilling Engineering, 2022,49(3):83-91. |
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| 基金项目:国家重点研发计划课题“煤层瓦斯赋存参数的地面准确测定技术及装备”（编号：2018YFC0808001） |
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| 中文摘要:气举反循环钻进工艺具有钻进效率高、工艺配套简单、孔内干净等特点，广泛应用于工程实践中。但由于配套的双壁钻具结构设计主要依据经验进行，在理论研究方面不成熟，导致对工程应用中出现的问题缺乏深度分析。文章借助数值模拟研究方法对气举反循环技术中双壁钻杆环形空间与气水混合器两个重要部件的流场速度与压力特征进行数值仿真。结果表明：减少双壁钻杆环形空间的变径或增加变径长度更有利于减少压力损失和能量损耗，气水混合器完全对称的进气孔结构更有利于上返速度的均匀性，减少堵塞问题的发生。研究结果可为气举反循环钻具的设计及解决实际工程问题提供参考。 |
| 中文关键词:气举反循环 双壁钻具 双壁钻杆 气水混合器 数值模拟 流场分析 |
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| Simulation analysis of the flow field of the air lift reverse circulation dual wall drill tool |
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| Abstract:Air lift reverse circulation drilling technology has been widely used in the field due to its high drilling efficiency， simple process， cleanliness of the hole. However， the design of the dual wall drill tool mainly relies on the experience， and immature theoretical research leads to the lack of in-depth analysis of the problems in the field. In this paper， the velocity and pressure characteristics of the flow fields in the dual-wall drill rod annulus and the air-water mixer in air-lift reverse circulation technology are simulated by means of the numerical simulation method. Flow field analysis results show that reducing diameter changes in the annulus or increase the length with the diameter change is more advantageous to reduce the pressure loss and energy loss along the dual-wall drill rod， and the completely symmetrical air inlet structure of the air-water mixer is more advantageous to the evenness of the up-hole velocity， and reduces the occurrence of blockage. The results of the study can and provide reference for design of gas lift reverse circulation drilling tools， and solutions to field problems. |
| keywords:air-lift reverse circulation dual-wall drill tool dual-wall drill pipe air-water mixer numerical simulation flow field analysis |
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