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Numerical Simulation on the Bottom Hole Flow Field of Particle Impact Drilling

Author: HouDeJu
Tutor: XuYiJi
School: China University of Petroleum
Course: Oil and Gas Well Engineering
Keywords: Particle impact drilling FLUENT Numerical Simulation Discrete Phase Model Bottomhole flow field
CLC: TE21
Type: Master's thesis
Year: 2011
Downloads: 49
Quote: 0
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Abstract


Particle impact drilling technology (Particle Impact Drilling PID ) is a new kind of drilling technology , the technology can effectively improve the Sham Tseng hard formation drilling rate . U.S. PDTI (Particle Drilling Technology Inc.) Has been carried out theoretical research and on-site application test , the current technology is relatively mature , but the PID drill bottomhole flow field optimization design issues that need further research . In this paper, numerical simulation - based indoor experimental validation of particle impact drilling bottomhole flow field simulation study . PID drill bit using Gambit software to create three-dimensional geometric model and mesh ; drill still using the standard k - ε model and wall function , select velocity inlet and free flow outlet using Fluent software well the end of the flow field in the simulation, and simulation of the velocity field, pressure field and particle trajectories . The simulation mainly include: (1) the speed and pressure of the downhole flow field under study drill stationary distribution law ; (2) to study the changes in the distance of the nozzle to the bottom , the nozzle spray angle change and the nozzle entrance of the changes in the speed bottomhole flow field , and analysis of downhole flow field changes in the law with the above factors and reasons for the change ; ( 3) the use of the discrete phase model simulation , to downhole particle trajectory , and analysis of the particles in the velocity distribution and movement conditions; final verified by experiments, measured standoff distance , angle , pressure investigated the effect of rock breaking , resulting law is consistent with the numerical simulation results , thus proving the correctness of numerical simulation . Bottomhole flow field of particle impact drilling technology , research analysis the PID drill WATER structure optimization design has important practical engineering significance .

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