深井旋转轴套流场的CFD模拟

CFD Simulation on the Flow Field of Drill Head in the Deep Well

摘要:

旋转轴套在超深井工作时，其井下流动是三维湍流流动，旋转轴套的旋转和表面曲率效应以及随之而来的哥氏力和离心力，使流场在超深井的流动中极其复杂，同时，由于流体介质泥浆属于液固两相流，更致使内部流场测试困难，而且超深井中的工况在使用常规方法已很难得到较准确的数据。为此，将计算流体力学软件Fluent应用于超深井下流场的模拟，基于Navier-Stokes方程和Reynolds应力方程模型，建立多种仿真模型，在相同条件下，使用CFD仿真软件Fluent模拟仿真的不同结果，优化与旋转轴套叶片设计相关的几何参数，提高

Abstract:

When the drill bit is drilling in the ultra-deep well, the flow field is in 3-D turbulence. The revolving and the surface curvature effect of the drill bit, as well as the following coriolis force and the centrifugal force make the flow field extremely complex in the ultra-deep well. Simultaneously, because the fluid medium mud belongs to two-phase currents of fluid and solid, which makes the test of internal flow field more difficult. The fluid dynamics software-fluent is applied in the ultra-deep well, based on the Navier-Stokes equation and the Reynolds stress equation model, several models are built in the paper. In the same conditions, the different results are stimulated by CFD simulation software Fluent; relative designing geometry parameters are optimized.