Numerical Simulation of Bottomhole Flow Field Structure in Particle Impact Drilling

2017 3rd International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Zhou, Weidong^1 ; Huang, Jinsong^1 ; Li, Luopeng^1

School of Petroleum Engineering, China University of Petroleum, China^1

关键词: Flow field distribution;    Flow field model;    Flow field structure;    Fluid property;    Impact pressures;    Particle impact;    Three-dimensional motion;    Vertical borehole;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/108/3/032080/pdf
DOI  :  10.1088/1755-1315/108/3/032080

来源: IOP

【 摘 要 】

In order to quantitatively describe the flow field distribution of the PID drilling bit in the bottomhole working condition, the influence of the fluid properties (pressure and viscosity) on the flow field of the bottom hole and the erosion and wear law of the drill body are compared. The flow field model of the eight - inch semi - vertical borehole drilling bit was established by CFX software. The working state of the jet was returned from the inlet of the drill bit to the nozzle outlet and flowed out at the bottom of the nozzle. The results show that there are irregular three-dimensional motion of collision and bounce after the jetting, resulting in partial impact on the drill body and causing impact and damage to the cutting teeth. The jet of particles emitted by different nozzles interfere with each other and affect the the bottom of the impact pressure; reasonable nozzle position can effectively reduce these interference.