PDC钻头喷嘴倾角流场特性模拟研究

利用数值模拟的手段,在K-ε方程数学模型上计算封闭的N-S方程,对不同类型的PDC钻头喷嘴倾角组合进行了流场模拟。模拟结果表明:喷嘴倾角对PDC钻头的井底流场有明显的影响,不同的喷嘴倾角组合,井底流场特性不同,水力清岩的效果不同。保持中心喷嘴倾角一定,外围喷嘴倾角为20°~30°时,能使井底压力场、速度场达到最优。保持外围喷嘴倾角一定,中心喷嘴倾角为12°~22°时,能使井底压力场、速度场达到最优。

Through numerical modeling, this paper focuses on the flow field simulation of thedifferent spray anglesin the basis of closed N-S equation calculation with K-ε equation. Some laws are found that the spray angle of nozzle is important to the flow field quality. The flow field quality changes with theangles of center and peripheralnozzles. When the angle of center nozzle remains un-changed, the angle of peripheral nozzle is 20°~ 30°. And under such condition the optimal bottom hole pressure field and velocity field can be achieved.When the angle of peripheral nozzle remains unchanged, the angle of center nozzle is 12°~ 22°. And under such condi-tion the optimal bottom hole pressure field and velocity field can be achieved.