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中文摘要：
针对传统寄生管充气钻井工具在环空中形成的气相分布不均匀的弊端，设计了一种新型环形气体均布寄生管充气钻井工具。根据传热学、热力学和垂直气液两相管流理论，考虑注入气体物性随井筒温度压力变化，对环空充气工艺参数进行优化分析。分析结果表明，环空压力随注气量增大先急剧降低后逐渐升高，注气量通常选择在稍大于临界点处对应的气体流量；在静压控制区环空压力变化幅度明显大于井口回压变化，环空压力变化敏感；在摩擦控制区随井口回压变化，环空压力变化幅度较小，更加缓和，易于调节。
英文摘要：
The gas phase distribution of traditional parasitic tube aerated drilling tool is uneven in annulus. Therefore, a new type of parasitic tube aerated drilling tool with even distribution of annular gas was designed. According to heat transfer theory, thermodynamic theory and the theory of vertical gas liquid two-phase pipe flow, the optimization analysis of the parameters of the annular aeration technology was conducted considering the variation of injection gas physical property with shaft temperature and pressure. The findings show that annular pressure first decreases with the increase of gas injection rate and then gradually increases. The gas flowrate slightly larger than that at the critical point is taken as the gas injection rate. The variation amplitude of annular pressure in the static control zone is noticeably greater than wellhead back pressure variation. The annular pressure becomes sensitive. In the friction control zone with the variation of wellhead back pressure, the variation amplitude of annular pressure is relatively small, getting milder and thus is easier to regulate.
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