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中文摘要：
气体钻井机械钻速快，能有效防止水敏性泥页岩坍塌，减少井漏。然而，气体钻井易形成岩屑沉积，钻进中易发生卡钻等井下复杂情况和事故。为提高沿程环空流体对岩屑的推举能力，介绍了一种具有分流继能作用的防沉屑工具。阐述了其机理，对不同开孔尺寸防沉屑工具分流量和分流流体动能进行了数值模拟，推荐了计算井眼条件下的开孔尺寸，并分析了工具结构的安全性。计算分析表明，防沉屑工具具有分流继能功能，可有效提高对岩屑的推举能力，工艺适应性强；合理的结构设计可确保其工作的安全性，可用于中深直井、水平井空气钻井中。
英文摘要：
Air drilling has higher drilling speed and can prevent collapse of water sensitive shale and reduce lost circulation. While it may have a lot of complex downhole accidents including cuttings deposition and pipe sticking. In order to improve the cuttings transport capability of fluid along the annulus, a cuttings falling-prevent tool was introduced in this paper. The paper described this tool＇s working mechanism. Numerical simulations of the dividing-fluid quantity and kinetic energy with different apertures were conducted. The aperture size was recommended and the structure safety was analyzed. The analysis shows that the cuttings suspension tool had the capacity of dividing-fluid and increasing-energy, and improving cuttings transport. Its reasonable structure design ensures working safety and can be used to drill deep vertical and horizontal well.
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