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空气钻井能够有效的提高钻井的效率,缩短作业时间和降低现场作业风险。气体不仅密度低、压缩性强,空气钻井的体积流量随压力和温度变化非常明显,使得压力和温度随井深的变化关系更加复杂,因此研究空气钻井过程中井筒内压力分布规律对现场作业具有实质性的指导作用。以广义的钻井工程原理及空气动力学为基础,假设岩石颗粒与循环气体的混合体符合理想气体的状态方程,推导完全不同于以往钻井液钻井的理论模型和实用公式,通过现场实例数据作出压力在环空和钻具内的变化规律图,得出不同深度下压力在环空和钻具内的分布规律。
Air drilling can effectively improve the drilling efficiency, shorten the working time and reduce the risk of on-site operation. Because of the low density and strong compressibility of gas, the volume flow rate of air drilling varies greatly with pressure and temperature, which makes the relationship between pressure and temperature more complicated with the well depth. Therefore, the research on the pressure distribution in wellbore during air drilling is essential to field work Sexual guidance. Based on generalized drilling engineering principles and aerodynamics, assuming that the mixture of rock particles and circulating gas conforms to the equation of state of the ideal gas, the theoretical and practical formulas that are completely different from the drilling fluid drilling in the past are deduced and pressure is made through on-site case data In the annulus and the drill tool change law chart, obtains under the different depth the pressure distributes the law in the annulus and the drill tool.